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Publication numberUS2365632 A
Publication typeGrant
Publication dateDec 19, 1944
Filing dateOct 1, 1942
Priority dateOct 1, 1942
Publication numberUS 2365632 A, US 2365632A, US-A-2365632, US2365632 A, US2365632A
InventorsFisher Frederick C
Original AssigneeElectronid Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electromagnetic motive means
US 2365632 A
Images(7)
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Description  (OCR text may contain errors)

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ELECTROMAGNETIC MoTIvE MEANS Filed Oct. 1, 1942 '7 Sheets-Sheet 1 Sem Ram Dec. 19, 1944. F. c. FISHER 2,365,632

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the solenoid windings and the plunger.

DEETCH acum UNITED STATES PATENT GFFICE ELECTROMAGNETIC' MOTIVE MEANS Frederick C. Fisher, Bellmore, N. Y., assgnor to Electronoid Corporation, a corporation of New York Application October 1, 1942, Serial No. 460,398

21 Claims.

invention relates to electro-magnetic This motive means which, while useful for other purposes, is intended primarily for operating the This application is a continuation in part of my application, Ser. No. 300,018, filed October 18, 1939, now Patent No. 2,303,263, Nov. 24, 1942.

The electro-magnetic motive means of the present invention is, in general, of the type disclosed in my said application Ser. No. 300,018 and in accordance with the present invention and pursuant to one of the objects thereof, the solenoid windings are energized in the proper sequence by means controlled by the relative movement between the solenoids and the solenoid plunger and operable in such manner as to eliminate the use of switch operating mechanisms. More specically, in accordance with the present invention the solenoids are connected to and disconnected from the line at the proper times by electrically operated relays, the operation of which are electrically controlled by current varying means whereby to produce a relative movement of the solenoids and their plunger, the movement of the solenoids or their plunger as thecase may be being smooth and continuous and of the length of travel necessary for actuating the device operated thereby.

Also, in accordance with the present embodiment of the invention, the continuous relative movement of the solenoids and plunger is obtained by spacing the solenoids, longitudinally of the solenoid plunger, one-third of the axial length of a solenoid winding, the axial lengths of the solenoid windings being equal and the magnetic and non-magnetic sections of the plunger being each equal to the axial length of the solenoid winding. This enables the solenoids to be spaced more closely than in the apparatus disclosed in my above mentioned application while at the same time obtaining the smooth and continuous relative movement of This constitutes another object of the present invention.

A further object of the invention is to provide an electro-magnetically operated device which operates under the control of current varying means which is responsive to the action of an iron core or plunger. In accordance with this object of the invention and pursuant to one form thereof, the current varying means is a reactance device including a reactance coil, the inductance reactance of which is increased when said core is entered into said Winding; and pursuant to another form of the invention, the current varying means is a transformer in which the secondary current is increased when the iron core is entered into the transformer winding.

In accordance with a more specific object of the invention, the iron core which forms a part of the current varying means is operated by one or more solenoids, preferably but not necessarily as part of the solenoid plunger, and the electromagnetically controlled means which operates under the control of the current varying means controls, in turn, the operation of the solenoid or solenoids.

Another object of the invention is, more generally, to control the relative movement between the relatively movable parts of an electrodynamic device by current varying means such as reactance means or electric transformers.

The above and other objects, features and advantages of this invention will be fully understood from the following description, considered in connection with the accompanying illustrative drawings.

In the drawings:

Fig. l is a perspective view of the electromagnetic motive means of the present invention operatively connected to the door of an elevator cab for operating the same;

Fig. 2 is a side view in elevation, with parts in section, of the motive device;

Fig. 3 is a top plan view of the device, the top of the casing being removed, and parts of the top of the casing being cut away for the purpose of illustration;

Fig. 4 is an end view of the device, seen along the line 4--4 of Fig. 2, when the end closure of the casing is removed;

Fig. 5 is an exploded perspective View of the parts of the reactance structure;

Fig. 6 is a transverse sectional view of the reactance structure;

Figs. 7 and 8 are end and top views, respectively, of the solenoid;

Fig. 9 is a side view of the plunger, parts being broken away for the purpose of illustration;

Fig. l0 is a sectional view of the plunger on the line lil-I0 of Fig. 9;

Figs. l1 to 16, inclusive, are diagrammatic views illustrating the operation of the motive device of the present invention;

Fig. 1'7 is a more or less diagrammatic view of the motive device and of the electric circuit;

Fig. 18 is a circuit diagram similar to Fig. 17, illustrating a modification;

Fig. 19* is a side view of a control relay of the type utilized in the circuit shown in Fig. 18;

Fig. 2O is a front view of the relay shown in Fig. 19;

Figs. 21 to 26, inclusive, are diagrammatic views similar to Figs. 11 to 16, inclusive, illustrating another form of the invention;

Fig. 27 is a circuit diagram of the form of the invention illustrated in Figs. 21 to 26;

Fig. 28 is a transverse sectional view, on a larger scale, on the line 28-28 of Fig. 3;

Fig. 29 is a sectional View on the line 29-29 of Fig. 3.

Referring now to the drawings in detail, the electro-magnetic motive device I embodying the present invention is shown operatively connected to an elevator door DI of an elevator car for opening and closing the latter, but it will be understood that said motive device can be utilized for other purposes. Part of the frame of the elevator car is indicated at F and said door DI and the other door D2 of the elevator car, said doors being coupled together for movement in the usual way longitudinally of the fixed tracks J, are suspended at their upper ends by means of wheel bracket GI and G2. In Fig. 1 is also shown a corridor door D3 suspended from and movable longitudinally of the track K xed to the corridor wall. The corridor door D3 is shown displaced from its normal position in relation to the elevator car door DI for the sake of clearness of illustration, and it will be understood that doors DI and D3 are normally in side by side relation to permit them to be coupled and uncoupled in a suitable Way, for example, in the manner illustrated in my above men- 'tioned application. Parts of an electrically operated device for coupling and uncoupling doors DI and D3 are indicated at O and M in Fig. 1, and require no further description as they do not form part of the present invention.

Theelevator car door DI is opened and closed directly by an electro-magnetic device I0 of the present invention. Said device comprises three solenoids SI, S2 and S3, all of the same construction, and each having a winding or coil Il and a laminated iron core I2, being as here shown designed for alternating current operation. Said solenoids are secured in a frame I3 comprising opposed channel irons I4 as shown in Figs. 2 and 4, one of said channel irons being omitted from Fig. 2 in order to disclose the solenoids. The cores I2 have brackets I8 secured thereto by which they are fixed to the channel irons I4. The frame I3 which comprises the channel irons I4 also include opposed channel irons I8 secured to the upper flanges of the adjacent channel irons I4 in any suitable way as by bolts 28. A cover plate 22 is provided for the top of the housing and removable end closure members 24 and 26 are provided at thev opposite ends of frame I3, said end closure members having an opening 25 for the passage of the solenoid plunger 28. Channel irons I8 constitute a housing for the relays A, B, C and D which will be subsequently described. y

The solenoid plunger 28 is mounted in xed position at the top of the elevator car, as illustrated more or less diagrammatically in Fig. 1, and extends through the three solenoids, as shown in Fig. 2, the latter being movable longitudinally of said plunger. In order to permit plunger 28 thus to extend through the solenoids, the cores I2 of the latter are split as illustrated in Fig. 2, and shown in myprior application,

forming divided core portions 30 between which plunger 28 projects. It will be understood that the three solenoids are mounted in alignment so that said solenoids can move longitudinally of the plunger. Housing I3 is supported for movement longitudinally of plunger I4 by upper and lower pairs of rollers 32 and 34, respectively, carried by bearing frames 38 and 38 xed at the opposite ends of channel irons I4 in any suitable way. Plunger 28 is thus prevented from sagging and a proper slight clearance between the solenoid windings and the plunger is thus provided.

Plunger 28 comprises magnetic sections 40 and non-magnetic sections 42 (Fig. 9) arranged alternately adjacent each other in abutting end to end relation and secured in said relation by a pair of longitudinally extending channel members 44 of brass or other non-magnetic material. Magnetic sections 40 are laminated being composed of sheet iron or laminae, and non-mag netic sections 42 are composed of fibre board, wood or other suitable non-magnetic material. Members 44 are spaced from each other to prevent or reduce eddy current losses. The end sections 4|] of the plunger are securely fastened to members 44 in any suitable way as by bolts 46, the ends of which are flush with the outer surfaces of members 44. Plunger 28 is thus constituted by a solid square rod composed of magnetic and non-magnetic sections in a split brass or other non-magnetic casing. The magnetic and non-magnetic sections 40 and 42 of the plunger are of the same length and each mag.- netic and non-magnetic section is equal to the axial length of the solenoid winding. The three solenoids are of the same length and they are in spaced relation in the direction of the longitudinal extent of plunger 28, the spacing being equal to one-third of the axial length of a solenoid winding. It will be understood that the length of the solenoid winding will depend on the space available and the power required. When direct current'is used, magnetic sections 40 need not be laminated and the casing of the plunger need not be split and it will be understood also that with direct current plunger 28 can have a circular cross section and the solenoid coils can be cylindrical.

With the above described arrangement of the plunger and the three solenoids, it will be found that when one of the magnetic sections of the plunger is just entering one of the solenoid windings in either direction, another magnetic section will be almost completely entered in the winding of a second solenoid, while another magnetic section will be leaving the winding of a third solenoid. Accordingly, by energizing the solenoid windings in such a manner that only the winding in which the magnetic section of the plunger is beginning to enter is energized and automatically de-energized when said magnetic section is fully entered, and at the same time relaying the power to the next solenoid winding, a continuous thrusting movement of the frame I3 to which said solenoids are secured will result. This movement is transmitted to the elevator car DI or to some other device, as the case may be, by connecting the solenoid carrying frame I3 to the elevator door. By way of illustration, this is accomplished, as here shown, by means of a bracket 48 secured to the bottom flanges of channel irons I4 and to brackets GI of door DI.

The means for controlling the energizing and,

deenergizing of the solenoid sequence whereby to obtain the above mentioned smooth and continuous thrusting movement will now be described. Said means comprises the current varying means, which in one form of the invention includes the reactance structure 50 mounted in stationary position between channel irons I4 in frame I3. Said reactance structure comprises three identical reactance or choke coils Rl, R2 and R3 positioned in longitudinally spaced relation Within a laminated iron shell formed of the parts 52 and 54 (Figs. 2, and 6) Said reactance coils are mounted on and xed to a hollow non-magnetic tube 56 through which plunger 28 is movable with a slight clearance. The manner of assembling said reactance coils and hollow tube 56 with shell parts 52 and 54 will be apparent from Figs. 5 and 6, and it will be understood that said coils and said tube 56 are secured in position between parts 52 and 54 which are fastened together in any suitable way as by a plurality of bolts (not shown) passing through the openings 58 in part 52 and aligned openings 60 in the companion part 54 of said laminated shell. It will be understood that the opening in hollow tube 56 is in longitudinal alignment with the central openings of the solenoids so that solenoid plunger 28 is movable longitudinally axially of the solenoid windings and of said reactance or choke coils. The first reactance coil RI is positioned one and one-third the length of a solenoid winding from the adjacent end of the adjacent solenoid winding, in this case solenoid winding S3, and reactance coils RI, R2 and R3 are spaced from each other longitudinally of plunger 28 by a distance equal to the length of the solenoid winding. The axial length of each reactance coil is equal to one-third the axial length of a solenoid winding. The reactance or choke coils RI, R2 and R3 are connected in a circuit with electro-magnetically operated means or control relays A, B and C, said circuit also including a reversing relay D (Figs. 2, 3 and 17), said control relays being operable under the control of said reactance coils for energizing and de-energizing the windings of solenoids Sl, S2 and S3, in the proper sequence, as will be hereinafter more specically described in a more detailed explanation of the operation of this in- Vention.

The control relays A, B and C are identical in construction and each of them is provided with two pairs of companion contacts, one pair of contacts being normally open and capable of carrying the current required by one solenoid, and the other pair of contacts being normally closed and used in the control circuit. These control relays are quick acting relays and are provided with means for adjusting armature clearance, contact gap, and spring tension. Since, as stated, these relays A, B and C are of the same construction, a description of one, in this case relay A, shown in Fig. 4 as well as in Figs. 2 and 3, will be suicient, but it will be understood that any relay having the characteristics referred to may be utilized in lieu of the specific relays herein shown or described. The control relay comprises a coil 62 wound for alternating current and provided with an iron core 64 and with an armature 66 pivotally connected as indicated at 68 to core 64. Armature 66 is fixed to the bottom of an insulation member 'l0 which carries the movable normally open and normally closed contact members Al and A2 of the control relay, these members being designated as Al and A2, respectively, but it will 56am 00m be understood that they are the same as the corresponding normally open and normally closed movable contacts BI and B2, respectively, of relay B and the normally open and normally closed movable contacts Cl and C2, respectively, of relay C. Companion normally open and normally closed stationary contacts are shown at al and a2, respectively, for relay A; at bl and b2, respectively, for relay B; and at cl and c2, respectively, for relay C. The movable contacts Al and A2 and the corresponding movable contacts of relays B and C, are not only carried by pivoted member 'l0 but are also movable with respect thereto to permit adjustment of the armature clearance and regulation of spring tension of said movable contacts when engaging their companion stationary contacts, respectively. For this purpose said movable contacts are each connected to a pin 12, the lower end of which passes loosely through the companion movable contact member and is secured to contact carrying member 10. Collar 14, slidable longitudinally of pin 'I2 near the lower end thereof, bears on the upper part of the companion movable contact member and is held resiliently against the latter by a compression spring 16. The upper end of spring I6 bears against a slidable collar 18 which can be adjusted longitudinally of pin 12 by a nut 86 threaded on the upper end of pin 12. The movable contact members are held against turning axially of pin l2 by screws 82 which pass through slots at the inner ends of said movable contact members, respectively, so that said movable contact members can move in relation to carrying member 10, as well as with the latter, for engaging the companion stationary contact mem* bers resiliently under the pressure of the companion springs 12, without limitation by the movement of armature 66 to its retracted position. A spring 84 holds the armature in its upper or retracted position, said spring being connected to contact carrying member 10. The clearance of armature 66 is adjusted by a screw 86 which is threaded through the top of the U-shaped strap 88 secured to the mounting insulation panel P. It will be understood that when the coil of the relay is de-energized spring 84 moves the armature 66 to its retracted position against the lower end of screw 86 and that by adjusting said screw in strap 88 the clearance of the armature is adjusted. The stationary contact members al and a2 are as here shown constituted by screws which are adjustable in insulation supports 90 and 92. The terminals for the movable contact members may be connected to the screws 82 while the terminals for the companion stationary contact members can be connected to the metal strips 94 which are secured to thecompanion insulation supports by nuts 96 in which the screws of the companion stationary contact members al and a2 are engaged.

The reversing relay D is a triple-pole doublethrow, alternating current relay wound to operate by the line current. This relay has three pairs of normally open companion contact members and three pairs of normally closed companion contact members, the normally open movable contact members being indicated at DI, D3 and D5 and the normally open stationary contact members being indicated at dl, d3 and d5. 'Ihe normally closed movable contact members are indicated at D2, D4 and D6 and the normally closed companion stationary contact members are indicated at d2, d4 and d6. This reversing relay is constructed substantially in the same way as the control relays A, B or C and has a single coil 98 and a single armature I 00 which operates all of the movable contact members of this relay, said amature being pivotally mounted in the same way as the armature 66 of the control relay and being fixed to a carrying plate |02 which is spring retracted in the same way as carrying plate 10. The carrying plate |02 of this relay mounts the movable contact members in the same way as in the control relays, and said movable contact members are spring -pressed in the same way as the movable contact members of the control relays for resilient engagement with the companion stationary contact members. Said stationary contact members are of the same construction as the stationary contact members of the control relays and are mounted in substantially the same way, the normally open stationary contact members being adjustable in an insulation support |04 and the normally closed stationary contact members being mounted in an insulation support |06. The terminals for the movable contact members are connected thereto in the same way as in the control relays and the terminals for the stationary contact members are connected to the strips |08 which are the same as the contact strips 94 of the control relays. The clearance of armature of the reversing relay is adjusted by a screw H0 which is in threaded engagement with the top of the strap H2 and engages contact carrying member |02 in the same way as the engagement of adjusting screw 86 with contact carrying member l0 of the control relays.

The operation of the above described apparatus will now be described with more particular reference to Figs. 11 to 17. Referring first to Fig. 17, it will be noted that each of the control relay windings 62 is connected in series with one of the reactance coils RI, R2, R3, so that the current flowing through the relay winding is governed by the impedance of the reactance or choke coil with which it is connected. The windings of the control relays and reactance coils are so matched that when a magnetic section 40 of plunger 28 is entered in the reactance coil, the inductive reactance due to the presence of said magnetic section in the reactance coil in addition to the inductive reactance due to the iron shell of the reactance coil is so high that the resultant current o'wing through the relay is lower than the pick-up rating of the relay and the latter remains open at its normally open companion contacts Al, al in the case of relay A or at the corresponding normally open contacts BI, bl in the case of relay B or the normally open contacts Cl, cl in the case of relay C. However, when the iron segment 40 is withdrawn from the reactance coil, the inductive reactance is lowered sufficiently to allow an increase in current which is suflicient to close the companion relay at its normally open companion contacts and to simultaneously open the normally closed companion contacts of said relay.`

Referring now to Figs. 11 to 16, and assuming for the purpose of explanation that the solenoid windings and the reactance coils are stationary and that the solenoid plunger 28 is movable, Fig.

l1 shows the position of plunger 28 after solenoid S2 has drawn magnetic section 40(e) completely into its Winding. In this position, it will be noted, magnetic section 40(f) is partially entered in solenoid S3 at the right thereof while magnetic section 40(9) is partially entered into solevmove to the left.

noid l at the left thereof. It is obvious that if solenoid Sl is next energized, the plunger will move to the right while on the other hand, if solenoid S3 is then energized the plunger will We lwill now assume that plunger 28 is to move to the left as indicated by the arrow in Fig. 11.

Referring still to Fig. 11, it will be observed that magnetic section (11) of the plunger has left the winding of reactance coil R2, thus lowering the reactance of its circuit and closing relay B through normally closed contacts C2, c2 of relay C (Fig. 17) and contacts D6, d6 of relay D. When relay B closes, its normally closed contacts B2, b2 open circuit relay A and its normally open contacts BVI, bl close, thereby completing a circuit through solenoid S3 across the line terminals Tl, T3 supplied with alternating current through the main switch MS from the lines Ll and L2. When solenoid S3 is thus energized it draws magnetic section 40(1) of the plunger into its winding and the plunger moves to the left, bringing the plunger to the position shown in Fig. 12. At this instant when plunger section 40(1) is completely entered in solenoid S3, the magnetic section 40(1) of the solenoid plunger is fully withdrawn from the reactance co1l R3 lowering its reactance to minimum, so that the flow of current increases through said coil R3 passing through the latter and normally closed contacts A2, a2 of relay A and contacts D2, d2 of relay D, thus energizing the coil of relay C. When the coil of relay C is energized, its normally closed contacts C2, c2 open, thus disconnecting the coil of relay B. When relay B is disconnected its contacts B2, b2 close and a current of low value will flow through the reactance coil Rl and relay A in preparation for its closing operation, but at this time section 4001,) of the plunger is fully entered in reactance coil Rl causing maximum inductance which maintains the current at such a low value that said current is insufficient to energize relay A. On the other hand, the contacts BI, bl of relay B open and disconnect solenoid S3 thus releasing the magnetic section 40(1) of the plunger. When relay C closes, its normally open contacts Cl, cl close thus connecting the winding of solenoid Sl across the line so that said solenoid Si is energized and draws magnetic section 40(e) into said solenoid winding so that the movement of plunger 28 continues to the left as shown by the arrow in Fig. l2 bringing the plunger to the position shown in Fig. 13. Magnetic section 40(h) of the plunger has now left reactance coil RI causing current to flow through contacts B2, b2 of relay B to the contacts D4, d4 of relay D and thus energizing the winding of relay A. When relay A is thus energized relay C is de-energized and the winding of solenoid SI is likewise cle-energized, thus releasing magnetic section 40(6) of the plunger and at thisI time the winding of solenoid S2 is energized thereby drawing in magnetic section 40(1) of the plunger bringing the plunger to the same position in relation to the solenoid and reactance windings as that illustrated in Fig. 11. The cycle thus far described then repeats itself, the plunger moving continuously to the left for the length of travel allowed by the length of the solenoid.

If movement of plunger 28 to the right is desired, the relay D is closed by closing the switch RS, switch RA (hereinafter more specifically referred to) being open. When switch RS is closed and switch RA is open, contacts D2, D4"

and D6 of relay D open, disengaging their cornpanion contacts d2, d4 and d6 and contacts DI, D3 and D5 close engaging their companion contacts dI, d3, and d5, respectively. When this occurs the action, starting with the position of the parts illustrated in Fig. 14, takes place in the same Way described above with reference to Figs. 11 to 13 but in the opposite direction, that is to the right as shown by the arrows in Figs. 14, 15 Aand 16. More particularly, the position of the plunger in Fig. 14 is the same as in Fig. 1. Magnetic section (h) is clear of reactance coils RI and R2. In this case, the inductance of these reactance coils is minimum allowing maximum current to ow in either direction, but by reference to Fig. 1'7 it will be noted that when current ows through reactance .coils RI, contacts B2, b2, D3, and d3, relay C is energized. When relay C is energized, its normally closed contacts C2, c2 open and prevent current from flowing through reactance coil R2, while its normally open contacts CI, cI being closed, complete a circuit through solenoid SI so that the latter draws section `4Il(g) of the plunger within its winding thereby causing the movement of the plunger to the right to the position illustrated in `Fig. 15. It will be understood that said plunger continues to move to the right to the positions illustrated in Figs. 15 and 16 in the same manner as explained above with reference to Figs. 12 and 13, resulting in the movement of the plunger to the position illustrated in Fig. 14, which is the same relative position as that shown in Fig. 11, thus completing the cycle which is repeated, plunger 28 continuing to move to the right to the extent allowed by the ylength of the plunger until switch RS is opened. Accordingly, it will be understood that by opening and closing switch RS at the proper times, the plunger will reciprocate, moving alternately to the left, as illustrated in Figs. 11 to 13, and to the right as illustrated in Figs. 14 to 16.

The present invention makes provision for the automatic opening and closing of the reversing relay D. For this purpose, a relay E is connected in the circuit, as shown in Fig. 17, through the manually controlled switch RA, said relay being associated with a branch circuit having the normally open contacts EI, el and the normally closed contacts E2, e2, contacts E| and E2 being movable and contacts eI and e2 being stationary. The armature H4 of relay E controls companion relay contacts E3, e3, said last mentioned contacts being normally held open by a spring H6, contact E3 being a movable contact and contact e3 being a stationary contact. Contacts El and E2 are biased to open and closed positions, respectively, in any suitable way and are closed and opened, respectively, by operation of levers H8 and |20, respectively. It will be understood that levers H8 and |20 although shown at a short distance from each other will in actual practice be spaced at a distance approximately equal to the travel of plunger 28 (or of the solenoids SI, S2 and S3) in one direction so that said levers will be engaged at the end of the travel of the plunger (or of the solenoids) in either direction, thus alternately closing contacts EI, el, and opening contacts E2, e2. It will be understood that when the automatic operation of the reversing relay D is desired under the control of relay E and its companion branch circuit, switch RS is opened and switch RA is closed. In the position of the parts illustrated in Fig. 17, relay D is ole-energized as the contacts E3, e3 of relay E are open, said relay E being de- Search Room energized. It will be observed that one side of winding 98 of relay D is connected by the wire H9 leading to the main line I2I connected to terminal Tl and that the other side of the relay winding 98 is connected by a wire |22 to a termi- `nal T2 which connects with the other side |24 of the line, leading from the terminal T3 either through the line |26 controlled by the switch RS or through the branch line |28 controlled by the relay contacts E3, e3, or through the contacts EI, eI and E2, e2. Branch line |28 connects line |24, through switch RA, to movable contact member E3 of relay E.

When the reversing relay D is to be energized automatically following the limit of travel of plunger 28 to the left, so that said travel will be reversed and take place in the right hand direction, as described above, automatically under the control of relay E and the associate branch circuit, switch RS is opened and switch RA is closed. It will be understood'of course that the movement of the solenoid windings, and the casing I3 carrying the same, to the right is the equivalent of the movement of the solenoid plunger to the left. Accordingly, when casing I3 reaches the limit of its travel to the right, relay D is closed, that is, a circuit is completed through its Winding 98, so that the movement of casing I3 will be reversed and take place to the left. For this purpose, the normally open contacts EI, el are arranged to be closed when casing I3, or a part connected thereto and movable thereby, reaches the limit of its travel to the right. This will occur when said casing engages lever H8 whereby to actuate movable contact EI for engaging its companion stationary contact el. When contacts EI, eI are thus engaged, current passes from main line |24 through switch RA through contacts EI, eI to wire |30 (which connects movable contact El to stationary contact e2) and then through the normally closed contacts e2, E2 and from the latter over the Wire |32 to one side of the coil |34 of relay E, fpassing through said coil I 34 and to the other main line I 20 over the wire I 36. Winding |34 is thus energized and operated to close the norrmally open contacts E3, e3 and current flows from line |24 over wire |28, through said contacts E3, e3 over wire |22 to one side of winding 98 of relay D and then over wire H8 to the other main line |20, thus operating the reversing relay D. At this time, current may also flow to the winding of relay D from the contacts EI, el over the wire |30 and over the wire |38 to wire I 22, so that the winding 98 of relay D is energized instantaneously upon the closing of contacts EI, el. However, a holding circuit through relay E is provided for maintaining the winding 98 of relay D energized until casing I3 or the part operated thereby reaches the limit of its movement to the left, at which time lever |20 is operated by the casing or by some other part movable thereby, whereby to disengage movable contact member E2 from its companion stationary contact member e2, thus breaking the circuit through winding |34 of relay E. When the winding of relay E is thus de-energized, spring H6 of relay E disengages movable contact vE3 from the companion stationary contact e3, thus breaking the circuit through the winding 98 of the reversing relay D and restoring said reversing relay to its condition for the movement of the solenoid plunger to the left or the equivalent movement of the solenoid windings or casing I3 to the right. It

will be noted that the holding or locking cirl cuit for relay Ylil 'maintains the winding |34 of said relay energized from the time that switch contact lever H8 is disengaged to the time that switch lever |20 is engaged, current for energizing winding |34 being then supplied'from line |24 over wire |28 through contacts E3, e3, wire |38 through normally closed contacts E2, e2 and wire |32, this holding circuit being broken when switch lever |20 is operated to disengage contact E2 from contact e2, thus resulting in deenergizing Winding 34 and the opening of the circuit at contacts E3, e3, this circuit remaining open until c'l'intacts'y El, e2 are closed when casing |3 again reaches the limit of its travel to the right.

Instead of utilizing the circuit illustrated in Fig. 17, the circuit shown in Fig. 18 may be used and in that case the control relays A', B and C' instead of having one Ipair of normally open contacts and one pair of normally closed contacts as in the case of relays A, B and p will each have two pairs' of companion normally open contacts. The operation of the apparatus with these relays inthe circuit as illustrated in Fig. 18 will now be described, reference being had also to Figs. l1 to 16 in conjunction with I Fig. 18. Assuming that the plunger is in the position illustrated in Fig. 11 and is to move to the left, as soon as the magnetic' section 40(11) leaves reactance coil R2 an increasein the flow of current through relay B' takes' place, thus closing said relay at both of its normally open contacts, the flow of currenttaking place from line l|24 to one side of reactance coil R2 and from the other side thereof to the normally closed the rmain lines |20 and |24 and short circuits relay A', the latter being in series with reactance coil RI when contacts B'2, b'2 of relay B are open. Relay A' being thus short circuited is thus deenergi'zed and opens at both fpairs of its companion contacts A'l, a'l, and A'2, a'2, thus breaking the circuit through solenoid S2. This brings the plunger to the 'position illustrated in Fig. 12, at which time solenoid SI is energized by the closing of relay C at its companion contacts C|, c'| which occurs when relay A' was de-energized and opened at its contacts A'2 and a'2. It will be understood that in moving from the position illustrated in Fig. 11 to the position illustrated in Fig. 12, section 40(2) of the plunger is moved out of reactance coil R3, thus causing current to ow from line |24 through said reactance coil andfrom the latter to the contacts D2, d2 of relay D toone side of the winding 62 of relay C and from the other side vof said winding to the other main line |20, thus closing said relay at its contacts C|, c'| and completing a circuit from one main line |2| through said contacts C|, c'| to one side of the winding of solenoid SI and from the other side of said winding tothe other vmain line |24.

At the same time, the contacts C2, c2 are closed and thereby throwO reactance fcoil R2 directly across the main lines |2| and |24, short circuiting yrelay B', thus de-energizing the winding 62 of the latter so that it opens at' both pairs of its companion contacts. When relay B' is opened the winding of solenoid S3 is de-energized and the parts are in the position illustrated in Fig. 13 following which solenoid S2 is to be energized. At this time section 40(h) of the plunger has left reactance coil RI so that a flow of current takes place from line |24 through said reactance coil and from the latter to contacts D4, d4 of relay D to one side of winding 62 of relay A' and from the other side of said winding to line |2|, thus energizing said relay and closing both |pairs of the companion contacts of the latter. The closing of the contacts A' a'l of relay A' completes a circuit through the Winding of solenoid S2 from one line |2| through said contacts A'i, a'l to one side of said solenoid and from the other side of said solenoid to the other main line |24. At the same time, contacts A2, a'2 of relay A close and short circuit the winding 62 of relay C', thus de-energizing said relay so that both of the pairs of contacts thereof open. This completes the cycle which is repeated along successive lengths of the plunger. When it is desired to move plunger y28A to the right, relay D is operated either by theA closing of switch RS, switch RA being open for manual operation, or by opening switch RS and closing switch RA, for automatic reversing operation as described above with reference to Fig. 17, relay E and the branch circuit associated therewith being the same as in Fig, 17. When windingv 08 of relay D is energized for operating said relay, the normally closed conf' tacts D2, d2, D4, d4, and DB, d6 are opened and the normally open companion pairs of contacts DI, dl, D3, d3 and D5, d5 are closed. When said normally open contacts of relay DV close, ,plunger 28 moves to the right, the solenoid windings are energized under the control of relays A', B' and C' in the same way as just described in explaining the movement of the solenoid plunger to the left except that the solenoid windings are energized in the order of solenoid windings Sl, S3, and S2. It will be noted that the relays A', B' and C' are operated in the circuit under the control of reactance coils RI, R2 and R3 so that when one relay is energized the relay which was just previously energized is short circuited and is de-energized and thereby prepares the third relay to be energized as soon as the magnetic section moves out `of the reactance coil which controls the operation of said third relay.

It will be understood that relays A', B' and C' may be of the same construction as relays A, B and C with the exception that both sets of contacts, being normally open, are at the same side of the pivot 68, namely at the sideA at which the contacts AI, al of relay A are positioned as illustrated in Fig. 4. Thisy is illustrated in Figs. 19 and 20.

In accordance with the form of the invention illustrated in Figs. 21 to 27, transformers are utilized instead of the reactance coils, in conjunction with the plunger 28, as the current varying means for controlling the operation of the ycontrol relays A, B and C, the arrangement being such that the magnetic sections 40 of the solenoid plunger 28, by moving into and out of the transformer windings,vary the current induced in the transformer secondaries and thereby control the operation of the control relays A, B and C for controlling the energization and de-energization, in the rproper sequence, of the windings of the solenoids SI, S2 and S3. In this form of the invention, the solenoid windings and the plunger 28 are of the same construction as described above and the solenoid windings have the same spaced relation longitudinally of the plunger as in the above described forms of the invention, and also in this form of the invention the axial length of the transformer winding is one-third the length of a solenoid winding, but in this form of the invention the transformers TRI, TR2 and TRS are spaced apart longitudinally of the solenoid plunger 28 a distance equal to one-third of the length of a solenoid winding and transformer TRI, which is closest to the adjacent solenoid winding S3, is spaced from said solenoid S3 a distance equal to one and two-thirds the axial length of a solenoid winding. The transformers are preferably mounted in a laminated iron shell and on a non-magnetic tube like the tube 56 shown in Figs. 5 and 6, and the primary and secondary windings of said transformers are connected in the circuit as illustrated in Fig. 27, the primary windings PW of said transformers being connected directly across the main lines and |24 and the secondary windings SW of said transformers being connected to the control relays as shown in said wiring diagram (Fig. 27).

The reversing relay D' which corresponds to the reversing relay D in the above described forms of the invention (Figs- 17 and 18) is substantially the same as said reversing relay D with the exception that relay D' is as illustrated in Fig. 27 a six-pole double-throw relay while relay D is a three-pole double-throw relay. It will be noted also that the reversing relay D can be operated either by closing switch RS for manual operation, switch RA being open, or by closing said last mentioned switch for automatic operation, switch RS being open, as explained above in connection with Figs. 17 and 18. The normally closed companion contacts of reversing relay D are indicated in Fig. 27 at DI, d; D3, d3; D5, d5; D'I, d1; D9, dS; and DH, dII; while the normally open companion contacts of said relay are indicated at D2, d2; D4, d4; D6, d6; D8, d8; DI8, dill; and DI2, dI2. Also it will be understood that all o-f the movable contacts are connected for operation in unison by the insulation rod DI which is connected to the armature |00' of this reversing relay.

The operation of the apparatus in accordance with this form of the invention as illustrated in Figs. 2l to 27 will now be described. First, it will be understood that, as in the circuit in which the reactance coils are used as part of the ourrent Varying means, the current in the transformer secondary is insufficient to operate the control relay when the nonmagnetic section of plunger 28 is entered in the transformer winding but increases to a value sucient to operate the control relay when the magnetic section or iron core of the plunger is entered in said winding. Referring to Fig. 27 in conjunction with Figs. 21 to 26 and rst with reference to Fig. 21, assuming that the solenoid plunger is to move to the left, as indicated by the arrow, when magnetic section 40(6) enters transformer TRI, the secondary current is increased and closes relay A through the normally closed contacts C2, c2 of relay C and through the normally closed contacts DI, dI, and DII, dII of relay D'. When relay A closes, the normally closed contacts A2, a2 of said relay open, dropping out relay B, and the normally open contacts AI, aI of relay A bllilll UUm being closed, solenoid S3 is energized and pulls plunger 28 to the left bringing it to the position shown in Fig, 22. At this point magnetic section 40(g) of the plunger enters transformer T3 causing an increase in the secondary current of said transformer and thereby closes relay C through the normally closed contacts B2, b2 of relay B and through contacts D1, d'I and contacts D9, (Z9 of relay D'. Upon the closing of relay C, the normally closed contacts C2, c2 of said relay open, thereby disconnecting relay A, which in turn de-energizes solenoid S3, and the normally open contacts CI, cI of relay C close, thus energizing solenoid SI, which draws in magnetic section 480i), moving plunger 28 to the left to the position shown in Fig. 23. At this position of the plunger, magnetic section 40(g) enters transformer TR2 causing an increase in current in the secondary of said transformer which causes relay B to close. When relay B closes, its normally closed contacts B2,

b2 open, thereby disconnecting relay C and deenergizing solenoid SI and closing the normally open contacts BI, bl, thus energizing solenoid S2. When solenoid S2 is energized, it draws in the magnetic section 40(1) of the plunger, which is then in the saune relative position in respect to the solenoids as in Fig. l. This completes the cycle which is repeated successively along the length of the rplunger. It will be understood that the movement of the plunger to the right takes place upon the closing of either switch 'RS for manual operation, or switch RA for automatic operation, as described above with reference to Fig. 11 or to Fig. 18.

As illustrated in Figs. 2, 3 and 4, the controlling relays and the reversing relay are mounted on the insulation panel P within the casing I3, but it will be understood that said relays need not be mounted for movement with casing I 3, but can be disposed on a pane] remote from casing I3, for example, in a switch room and connected in the circuit With the solenoids and with the reactance coils by a movable cable. However, since the need for this movable cable is eliminated by mounting the relays for movement with casing I3, the presently preferred embodiment of said relays provides for mounting them in casing I3.

When, as here shown, the relays are mounted in casing I3, it is advantageous to provide for the mounting and removal of said relays as a unit in readily removable relation to the solenoid and reactance coils in said casing so that in the event of the necessity for repairs or adjustments which cannot be easily made or which require considerable time, the unit, comprising mounting panel P and the relays carried thereby, can be easily removed from the casing and if desired, immediately replaced by another similar unit. In this respect the construction and arrangement contemplated in accordance with the present invention makes provision for the quick mechanical securement of the unit in casing 30 and the quick electrical connection of the relays to the solenoid and reactance coil windings. First, it will be understood that the relays A, B, C and D are mechanically secured to mounting panel P in any suitable way, unnecessary to be described or illustrated. In order, however, to removably secure panel P in housing I3 and more particularly between channel irons I8, said insulation panel P has securedthereto, as illustrated in Figs. 2, 3, 28 and 29, a pluralityof metal plates or bars |40, I4I, |42 and |43 disposed in transversely spaced relation in the space between relays C and D, and similar plates |44, |45 and |46 are secured to said panel P at points spaced longitudinally thereof near relays A, B and C, respectively. Said plates |40 to |46, inclusive, are of the same construction and each of said plates is secured to panel P by a bolt |48 which passes through said panel and is secured at the under surface of the latter by a nut |50, and to the lower end of said bolt an electric terminal member |52 is secured by a nut |54. Each of said plates |40 to |46 is also provided with a circular opening |56 for the slidable projection therethrough of a conducting stud here shown as a bolt |58. In the case of plates |40 to |43, inclusive, the companion bolts |58 are carried by an insulation plate |60 (Figs. 2, 28 and 29) which is secured to and below the upper ilanges of channels I4 by screws or bolts |62. By reference to Fig. 28 it will be observed that spacing members |64 are disposed between the upper surface of plate 60 and the lower surfaces of the upper flanges of channel irons I4, so that plate |60 will be disposed in spaced relation to the lower surface of insulation panel P to provide a space for the wires leading to the terminals. Each bolt |58 is secured to plate |60 by a nut |66, and said bolt is secured to the companion metal plate at the upper surface of insulation panel P by a nut |68. An electric terminal is secured to bolt |58 in any suitable way, as for example by the nut |66. It will be understood that when nut |68 is threaded down on bolt |58 for engagement with the companion metal plate at the top of insulation panel P, the

latter is mechanically secured removably in the housing and at the same time said metal plate is electrically connected to the companion bolt |58 and to the terminal |10 carried by the latter. Each of plates |44 to |46 is similarly connected to panel P by a screw |48 the lower end of which carries a terminal |52 and said metal plates |40, |45, and |46 are mechanically and electrically connected to companion insulation plates |60A, |60B and |60C, respectively, each of which is secured at its opposite ends to the upper nanges of channels |4 in spaced relation in the same way as illustrated in Fig. 28 with reference to plate |60 to provide a space for the wiring connected to the terminals at the lower ends of bolts |48. It will be understood that by removing the nuts |68 from the bolts carried by plates |60, |60A, |60B and |600, said panel can be easily removed through the top of housing 3 (top plate 22 having been removed) together with all of the wiring connected to the terminals |52 at the lower ends of bolts |48. It will be observed by reference to Fig. 3 that panel P also carries terminals TI, T2, and T3, referred to above with reference to the circuit diagram illustrated in Fig. 17. It will be understood that all of the terminals except the terminals connected to bolts 58 are carried by the insulation panel P, and from the wiring diagram illustrated in Fig. 17 the connections 0f said terminals in the circuit will -be readily understood by those skilled in the art. Although relay E is not shown mounted on panel P, it will be understood that said relay may also be mounted on said panel, if desired, and when said relay is not mounted on said panel it is to be connected, when used, in. the circuit by an appropriate cable.

It will be understood that the invention may be embodied otherwise than as herein disclosed and that in the illustrated embodiments certain changes in the details of construction and in the arrangement of parts may be made without departing from the underlying idea of the present invention. Also, it will be understood that while I` have illustrated the invention as used for operating an elevator door, the invention may be used for operating other devices and, more generally, the principle of the present invention may be applied to other purposes. Accordingly, I do not wish to be limited t0 the invention as herein specifically shown or described except to the extent which may be required by the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is;

1. Apparatus of the character described comprising a motive device including a plurality of solenoid coils arranged in tandem, a solenoid plunger having alternate magnetic and nonmagnetic sections arranged in tandem, said coils and plunger being mounted for relative axial movement, a plurality of reactance coils arranged in tandem and positioned in axial alignment with said solenoid coils, said reactance coils and said plunger being mounted for relative axial movement, said coils and said sections of the plunger being relatively positioned so that one of said magnetic sections is at least partly in one of said reactance coils when another of said magnetic sections is at least `partly in one of said solenoid coils, and means operable under the control of said reactance coils during the movement of said plunger to connect one of said solenoid coils to a source of electric current and to disconnect another of said solenoid coils from said current source.

2. Apparatus of the character described comprising a motive device including a plurality of solenoid coils arranged in tandem, a solenoid plunger having alternate magnetic and nonmagnetic sections arranged in tandem, said coils and plunger being mounted for relative axial movement, a plurality of reactance coils arranged in tandem and positioned in axial alignment with said solenoid coils, said reactance coils and said plunger being mounted for relative axial movement, said coils and said sections of the plunger being relatively positioned so that one of said magnetic sections is at least partly in one of said reactance coils when another of said magnetic sections is at least partly in one of said solenoid coils, and means operable under the control of said reactance coils during the movement of said plunger to connect one of said solenoid coils to a source of electric current and to disconnect another of said solenoid coils from said current source, and means for reversing the direction of relative movement between said plunger and said solenoid and reactance coils.

3. Apparatus of the character described com- Iprising a motive device including a plurality of solenoid coils arranged in tandem, a solenoid plunger having alternate magnetic and non-magnetic sections arranged in tandem, said coils and plunger being mounted for relative axial movement, a plurality of reactance coils arranged in tandem and positioned in axial alignment with said solenoid coils, said reactance coils and said plunger being mounted for relative axial movevment, said coils and said sections of the plunger being relatively positioned so that one of said magnetic sections is at least partly in one of said reactance coils when another of said magnetic sections is at least partly in one of said solenoid coils, and means operable under the control of uv I oym'orglw @UCIMU UUW said reactance coils during the movement of said plunger to connect one of said solenoid coils to a source of electric current and to disconnect another of said solenoid coils from said current source, and means for predetermining the direcbetween adjacent solenoid windings being about tion of relative movement between said plunger one third the length of a solenoid winding, said and Said solenoid and reactance Coils, solenoid windings and said plunger being mounted 4. Apparatus of the character described eomfor relative movement in the longitudinal direcprisirig a motive device including a solenoid havlo tion 0f the llllllngeldanq IlatVely mOVable saig ing a coil and a plunger, means operable to condirection W en Sa1 Wm lngS .are enel'glZe an nect and disconnect said coil to and from a source meals for siccessivly eI1rf1Z-1Y1g tsld Selllold of electric current, and reactance means oper- Will mgs an 01 @-enelglZlIlg e Wm lngS able in response to relative movement of said coil when the maeneue elections 0f the plunger are and plunger for controlling Itlie operations of said Centered 111 Sald WlrldlngS- connect and disconnect means, and means for 9- :E Tltlla'l apparatus COmDIlSlllg a frame, an predetermining the direction of relative moveeletlleal deVlCe mounted 0n Sad fr ame, a Panel, ment between said coil and said plunger. an electrical devife meanted or; Sad lae' 92nd 5. Apparatus of the character described cornmeans for connec mg Sad pane 'm0u n e eVlCe prising a motive device including a solenoid navte Seid rs mentioned eleviee, eempnsing e Cenlng a coll and a plungery means operable to conducting-stud xed to said frame and a conductnect and disconnect said coil to and from a source lng plate fixed '0 0 Sad panel and havmg al? Open' of electric current, and reactance means opermg f or the roletlon therethrough Sad Can able in response to relative movement of said dactmg'stu f at? means for remova y Sacunag coil and plunger for controlling the operations Sad Stud to Sad plate whereby to secure sala of said connect and disconnect means, and means Panel removably on Sad frameautomatically operative in response to a predela Apparaals of taa caaraaaer descnbed-com" termined relative movement of said coil and prisma: a mauve devlaa mcludmg aplurahty of plunger in one direction to reverse the direction solenolgncosa Solenald plfnger lavmg alamae of said relative movement.' magno 1c an non-magne 1c sec ions, sai coi s 6. Electro-magnetic motive means comprising and plunger b eing mounted aar .relativa molle" a solenoid plunger having longitudinally extendman?, a plurahay of control Wmdmgs .means m' ing magnetic and non-magnetic sections of equal alumna magnetla parts mavablaby sala plunger length disposed successively along the length of relatlonttghsala control twndmgsdfor Varymg the plunger in end to end relation, a plurality e Curran arem raspec we y. an .maans op oi' solenoid windings disposed in spaced relation 35 arable andar the caatroaof sala Wmdmgs for longitudinally of Said plunger Said solenoid connecting one of said coils to a source of cur- Wlndlngs and said plunger being mounted for rent and for disconnecting another .of said c oils relative movement in the longitudinal direction from the Source of Current when sala one C011 1s of the plunger and relatively movable in said connected thereto' t direction when said windings are energized, the 49 Apparatas of aaa charac ar aesanbad-com" axial length of each of said solenoid windings beprisma. a naotwa davlca. mcludmg a plprahty of ing equal to the length of one of said sections solanola calls. a solenold plungtar havag' altaa of the plunger, the distance between adjacent nata magnatlc and nan-magna 1c Saa lans Sal solenoid windings being about one third the axial cons and plunger .bemg mmmtaa aar relai-'Iva length oi a solenoid winding and means for ena5 movement a plurahty of control Wmdlaas means ergizing said solenoid windings one at a time analualag maaneac parts movabla by sala plunger ln succession in relation to said control windings for varying 7. Electro-magnetic motive means comprising the current tharam raspeatwaly. anamaans op' a solenoid plunger having longitudinally extendarable andar the Coatroaof sala Wmdmas for `50 connecting one of said coils to a source of curing magnetic and non-magnetic sections of equal tth f -d -l length disposed successively along the length of rent and for disconnec ing ano ero sai cors the plunger in end to end relation a plurality of from the source of current when said one coil is solenoid windings disposed in spaced relation lonconectad thereto and means automatmauy O-pgltudinally of said plunger the length of each erative in response to a predetermined relative of Said windings bein@ equal to the length of one movement of said coils and plunger in one d1- b o o o of said sections of the plunger and the distance rmegggftsagl gg gn of relatwe movebetween adjacent solenoid windings being about a one third the length of a solenoid winding, said pgOeglaecggdsgllgn slafnold vldmgs and Salaplungar bamg mmm?" solenoid coils, a solenoid plunger having altere el' re a We movement 1n the lollgltudmal d1' nate magnetic and non-magnetic sections, said rectien 0i the plunger and relatlvely movable coils and plunger being mounted for relative in said direction when said windings are enermovement, a plurality of control windings, means gized, and .means operableior successively enincluding magnetic parts movable by said plungergizing -said solenoidwindings in one sequence er in relation to said control windings for varyfor effecting said relative movement in one direcing the current therein, respectively, and means tlen and for successively energizing said solenoid operable under the control of said windings for Wlndlngs successively in a reversed .sequence for connecting one of said coils to a source of cureifecting said relative movement in a reverse rent and for disconnecting another of said coils direction. from the source of current when said one coil 8. Electro-magnetic .motive means comprising is connected thereto, and means operable under a solenoid plunger having longitudinally extendthe control of said last mentioned means for ening magnetic and non-magnetic sections of equal ergizing one of said windings and for simultanelength disposed successively along the length of ously de-enei'gizing another of said windings. the plunger in end to end relation, a plurality 13. Apparatus of the character described complunger.

prising a motive device including a plurality of solenoid coils, a solenoidplunger having alternate magnetic and non-magnetic sections, said coils and plunger being mounted for relative movement, a plurality of control windings, means including magnetic parts movable by said plunger in relation to said control windings for varying the lcurrent therein, respectively, and means operable under the control of said windings for connecting one of said coils to a, source of current and for disconnecting anotherof said coils from the source of current when said one coil is connected thereto, said last mentioned means comprising aplurality of relays having windings in series with said control windings, respectively, for controlling the energization of said control windings during said connection and disconnection of said solenoid coils. i n

14. Apparatus of the character described comprising a motive device including a plurality of solenoid coils, a solenoid plunger having alternate magnetic and non-magnetic sections, said coils and plunger being mounted for relative movement, a plurality of control windings, means including magnetic parts movable by said plunger in relation to said control windings for varying the current therein, respectively, and means operable under the control of said windings for connecting one of said coils to a source of current and for disconnecting another of said coils from the source of current when said one coil is connected thereto, said last mentioned means comprising a plurality of relays having windings in series with said control windings, respectively, for controlling the energization of said control windings during said connection and disconnection of said solenoid coils, each of said relays controlling the circuit of the winding of another of said relays in series with one of said control windings and a pair of relatively movable contacts engageable with and disengageable from each other in response to energization of the companion relay winding for effecting said connection and disconnection of one of said solenoid coils.

15. Apparatus of the character described comprising a motive device including a plurality of solenoid coils, a solenoid plunger having alternate magnetic and non-magnetic sections, said coils and plunger being mounted for relative movement, a plurality of control windings, means including magnetic parts movable by said plunger in relation to said control windings for varying the current therein, respectively, and means operable under the control of said windings for connecting one of said coils to a source of current and for disconnecting another of said coils from the source of current when said one coil is connected thereto, and means operable under the control of said last mentioned means for energizing one of said windings and for simultaneously de-energizing another of said windings, and means automatically operative in response to a predetermined relative4 movement of said coils and plunger in one direction to reverse the direction of relative movement of said coils and 16. In apparatus of the character described comprising a motive device including a plurality of solenoid coils, a solenoid plunger having alternate magnetic and non-magnetic sections, said kcoils and plunger being mounted `for` relative movement, means for energizing and de-ene'rgizing said solenoid coils in predetermined sequence comprising a plurality of control windings, means operable in response to the relative movement f said coils and plunger to vary the current in said windings, respectively, and means operable in response to the current in said windings for connecting and disconnecting the solenoid coils to and from a source of current.

17. In apparatus of the character described comprising a, motive device including a plurality of solenoidcoils, a solenoid plunger having alternate magnetic and non-magnetic sections, said coils and plunger being mounted for relative movement, means for energizing and de-energizing said solenoid coils in predetermined sequence comprising a plurality of control windings, means operable in response to the relative movement of said coils and plunger to vary the current in said windings, respectively, and means operable in response to the current in said windings for connecting and disconnecting the solenoid coils to and from a source of current, and means automatically operative in response to a predetermined relative movement oi said coils and plunger in one direction to reverse the direction of relative movement of said coils and plunger.

18, In apparatus o f the character described comprising a motive device including a plurality of solenoid coils, a solenoid plunger having alternate magnetic and non-magnetic sections, said coils and plunger being mounted for relative movement, means for energizing and de-energizing said solenoid coils in predetermined sequence comprising a plurality of control windings, means operable in response to the relative movement of said coils and plunger to vary the current in said windings, respectively, and means operable in response to the current in said windings for connecting and disconnecting the solenoid coils to and from a source of current, said last mentioned means comprising a plurality of relays each provided with contacts engageable with and disengageable from each other for effecting said connection and disconnection of the coil of a companion solenoid.

19. In apparatus of the character described comprising a motive device including a plurality of solenoid coils, a solenoid plunger having alter'- nate magnetic and non-magnetic sections, said coils and plunger being mounted for relative movement, means for energizing and de-energizing said solenoid coils in predetermined sequence comprising a plurality of control windings, means operable in response to the relative movement of said coils and plunger to vary the current in said windings, respectively, and means operable in response to the current in said windings for connecting and disconnecting the solenoid coils to and from a source of current, said last mentioned means comprising a plurality of relays each provided with contacts engageable with and disengageable from each other for effecting said connection and disconnection of the coil of a companion solenoid, said relays being also provided with contacts engageable with and disengageable from each other for connecting and disconnecting said control windings to a source of current.

20. In apparatus of the character described comprising a motive device including a plurality of solenoid. coils, a solenoid plunger having alternate magnetic and non-magnetic sections, said coils and plunger being mounted for relative movement, means for energizing and de-energizing said solenoid coils in predetermined sequence comprising a plurality of control windings, means operable in response to the relative movement of said coils and plunger to vary the current in said windings. respectively, and means operable in response to the current in said windings for connecting and disconnecting the solenoid coils to and from a source of current, said last mentioned means comprising a plurality of relays each provided with contacts engageable with and disengageable from each other for effecting said connection and disconnection of the coil of a companion solenoid, and means automatically operative in response to a predetermined relative movement of said coils and plunger in one direction to reverse the direction of relative movement of said coils and plunger.

21. In apparatus of the character described comprising a motive device including a plurality of solenoid coils, a solenoid plunger having alternate magnetic and non-magnetic sections, said coils and plunger being mounted for relative movement, means for energizing and de-energizing said solenoid coils in predetermined sequence comprising a plurality of control windings, means 596ml HOOm operable in response to the relative movement of said coils and plunger to vary the current in said windings, respectively, and means operable in response to the current in said windings for connecting and disconnecting the solenoid coils to and from a source of current, said last mentioned means comprising a plurality of relays each provided with contacts engageable with and disengageable from each other for eiecting said connection and disconnection of the coil of a companion solenoid, said relays being also provided with contacts engageable with and disengageable from each other for connecting and disconnecting said control windings to a source of current, and means automatically operative in response to a predetermined relative movement of said coils and plunger in one direction to reverse the direction of relative movement of said coils and plunger.

FREDERICK C. FISHER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2483895 *Apr 19, 1947Oct 4, 1949Electronoid CorpElectromagnetic straight-line motor
US2640955 *Apr 2, 1949Jun 2, 1953Electronoid CorpElectromagnetic straight-line motor
US2701331 *Aug 29, 1949Feb 1, 1955Frank K BenniePumping apparatus with electromagnetically propelled piston
US3287616 *Aug 12, 1963Nov 22, 1966Mcneil Dalph CSolenoid motor
US3293581 *Aug 10, 1960Dec 20, 1966John Joyce IncWide linear range inductively coupled sensing device
US3486095 *May 6, 1965Dec 23, 1969Westinghouse Electric CorpCycle control for linear motion device
US4215283 *May 3, 1978Jul 29, 1980Hinds Walter ELinear stepping motor
US4562385 *Oct 17, 1983Dec 31, 1985Rabson Thomas APeriodic reciprocating motor
US4815949 *Aug 14, 1987Mar 28, 1989Rabson Thomas AIn-well submersible motor with stacked component stator
US5175455 *Oct 31, 1990Dec 29, 1992Otis Elevator CompanyPermanent magnet linear door motor
WO2013017512A1 *Jul 26, 2012Feb 7, 2013Maschinenfabrik Reinhausen GmbhLinear drive for an on-load tap changer
Classifications
U.S. Classification310/14
International ClassificationB66B13/14
Cooperative ClassificationB66B13/143
European ClassificationB66B13/14B