US 2420768 A
Description (OCR text may contain errors)
3' Sheets-Sheet 1 ELECTRIC SWITCH Filed Jan. 12, 1945 D. D. BEVERIDGE, JR
y May zo, 1947.
May 20, W47. D., n. EEWWDGE, JR
ELECTRIC SWITCH Filed Jan. l2, 19% f5 Sheets-Sheet 2 NTUE May 20, 1947 D. D. BEvERxDGE, JR
ELECTRIC SWITCH Filed Jan. l2, 1945 3 Sheets-Sheet 5 Patented May 20, 1947 UNITED STATES PATENT GFFfQ.
. ELECTRIC SWITCH David D. Beveridge, Jr., Boston, Mass.
The primary object of the present invention is the production of an especially simple and very compact, shock-resistant switch which may be manufactured economically and operated eiliciently, notwithstanding any hard usage to which 6 Claims.
` it may be subjected.
Other objects of the invention will appear from the detailed description of the particular embodiment thereof selected tc illustrate the principle underlying the same. l
The invention consists of the various parts and combinations of parts hereinafter more fully described and dened by theappended claims.
' In the accompanying drawings: y Figure l is a central longitudinal section taken ontherline. l-| of Fig. 2 of a switch embodying myinvention, certain parts being shown in elevation.. Y. y
. Fig. 2 is a transverse-section taken on the line 2 4 ofrie. 1.- Fig. 3 is anelevationof the left-hand end of the switch mechanism shown in Fig. 4.
Fig. 4 is .a longitudinal section taken on the l irregularline 4`4`of Fig. 3.
ofthe left-hand end ofthe spindle means, a side view ,of said spindle means, and an elevation oi' the righthand end of said spindle means.
Figs. ll, 12, and 13, are,.respectively, an elevation of the left-hand end otheinertia wheel.
a side elevation o1' the same. and an elevation of the right-hand end of said wheel. v
Fig. 14 is a side view of my improved switch partly cut away to show the incorporation therein of telephonie apparatus.
Fig. 15 is a similar view showing the incorporration in said switch of an electric light bulb.
Figs. -15 are drawn on a smaller scale than Figs. l-4. Figs. 1617, and 18 are explanatory diagrams. y k
Fig. 19 is an exploded view showing the relation of the several parts making up the switch illustrated in Fig. 1.
In the particular drawings selected for more fully illustrating my invention and the principle underlying the same, such drawings being illustrative, merely, and not restrictive, 20 is a hous- Application January l2, 1945, Serial No. 572,454
., (ci. 200e-4) ing of insulating material for enclosing the switch mechanism, and 2| is a closure forthe same suitably attached thereto and housing the various wires that are connected to the stationary switch contact members.
Enclosed within the housing is a stationary spindle 22 rigldh' secured in the -bottom portion of the housing in any suitable manner, as by the screw 23. Mounted on said spindle for rotational and axial movement, is a plunger means comprising, inthe present instance, a push button 24, the forward portion ofwhich is enclosed within a sleeve' 25,.the forward end of said sleeve being provided with a plurality of internally projecting and uniformly spaced stop members 28, herein shown as three in number (Fig. 6). The spindle is provided intermediate its ends with two discs 21, 28, one or both of which may be integral with the spindle or separate therefrom and suitably secured thereto. The rearward face of the stop members 28 lof the sleeve abut the forward face of the disc 21 and thereby limit lthe outward movement of the plunger means. The disc 281s provided with one or more stop members 29 extending outwardly, and herein shown as three in number (Fig. 8). The spindle 22,
` with the discs 21, 28. rigidlysecured thereto or .31, of unequal diameter.
else integral therewith, is hereinafter called the spindle means. l y
Also mounted for rotational andaxial movement on the spindle means rearwardly ofthe disc 28,vis an inertia wheel-.comprising two discs 30, K The forward face of the disc 30 is disposed for ccf-operation with the stop members 26 of the plunger means and when the switch is in circuit opening position. there is a small gap between said disc kand said stop memb'er. Thei'disc 3| is provided with outwardly projecting teeth 32 (Fig. 13) having substantially the samel shape as the stop members 29 of the spindle means.
In normal or circuit opening position, the stop members 29 and the teeth 3 2 are in alignment, as are also the arcuate grooves or spaces 23, 36, between the stopmembers 25 `and the teeth 32. respectively (Fig. '1). In circuit opening position, the stop members 26'of the plunger means are in engagement with the respective stop members 29 carried by the spindle means and, as indicated in Fig. 8, the-plunger means may ce rotated axially through an arc equal' to approximately one-half the arc lying between each pair of stop members 29, i. e., the arc 332-33.
In circuit opening position, the teeth 532 are in engagement with the stop members 26 of the 'casarse plunger means and, as indicated in Fig. 13, the
. plunger means is free to rotate in a clockwise direction (from the-aspect of one viewing the outer end of the push button) through about onehalf the arc between each'pair of teeth 32 without rotating the inertia wheel. When the stop member 26 has moved in a clockwise direction to the face u" of the stop member 29, it will -be abutting said face 33" and also the face 34" of the teeth 32. and as the spindle means is stationa'ry. further clockwise motion of the plunger means` will be arrested. A l
Means are provided for reeasably coupling the inertia wheel to the spindle means, and, in the present instance, this is accomplished bythe lati.` eraliy extending pins 35, herein shown as three in number, projecting forwardly from the disc Il for co-cperation with the holes .38 disposedin the rearward face oi the disc 28. In circuit opening position, the inertia wheel is clutched to the spindle means (Fig'jd a'nd Fig. 16), and in circuit closing position, said pins abut the face of the disc 28 (Figs. l'l and 18). When the inertia wheel is uncoupled from the spindle means. the switch, being in circuit closing position, the clockwise rotation of the plunger means will move the inertia wheel in a clockwise direction and certain resilient means, hereinafter described, will move the wheel outwardly (rearwardly) and eiect the reclutching of the wheel and spindle means.
To effect axial outward movement of the a end of said spring resting in the groove 38 in the rearward end of the button (Fig. 5), and the other, in the groove 39, inthe outer face of the disc-.11. The spring 3l opposes the inward axial movement of the plunger means and at all times urges the rotary movement of said plunger means about the spindle means in a counterclockwise direction. When the plunger means is turned clockwise to reset the switch to circuit opening position, as hereinafter described, and then released. said spring will restore the plunger means to its original position with the stop 28 resting against the face 33' of the stop members 2i of the spindle means, and against the face Il' of the teeth 32 of the inertia wheel. A compound torsion-compression spring 40 is employed to resist the inward axial movement of the inertia wheel and to cause a rotary movement of the latter about the spindle means in a counterclockwise direction upon the uncoupling ofthe inertia wheel from the disc 28 of the spindle means.
The rearward torsion end of the spring 40 rests in the groove 4i of the spindle means, and the other end thereof is disposed in the groove 42 in the inner or rearward face of the disc 30. When further assembled in housing 20., the rearward torsion end of spring 40 will be guided by groove 4i of the spindle to be disposed into groove 42' of housing 20.
The inward (forward) face of the inertia wheel is provided with resilient contact fingers I3, of any suitable construction and material, said nngers, in the present instance, being shown as stamped out of an annulus 43'. suitably secured to the inward face' of the inertia wheel by the pins 44 taking into correspondingly spaced holes in said annulus and headed thcreover. Disposed for co-operation with said contact fingers are a corresponding number o'f studs 45, shown. in the present instance, as molded into the bottoni of said housing, to which studs are electrically connected in any 'suitable'manner the wires 46 of the circuits to be controlled. In the present instance, six such wires are shown. one being a ground wire, and the others each forming'one side of one ofthe five circuits which are opened and closed by the switch. :While the number and nature of the circuits are quite im material, in the present instance, the six circuits shown for illustrative purposes, merely, may control any suitable electro-responsive devices, audibleor visual. The usual hospital setup at the present time is as follows:
A buzzer is located in the nurses rest room and four signal lights are located, respectively, at the nursess duty station, the nurses diet kitchen. one in the hall outside the ward room door, and one in the wardroom beside "the ward patients bed.
In circuit opening position, five of the contact fingers rest under slight tension on the bottom of the housing,"as" indicated vat 43" in Fig. 2. The sixth iinger 43"', whichfcontlols the circuit of an audible signal, such as a buzzer,"is`ar ranged for co-operation with one of the studs 45 and is slightly spaced away therefrom.v When the plunger means is pressed inwardly,-the sixth finger will make contact with its lco-operating stud and close the Acircuit of the buzzer, or other audible signal device.' By pressingthe plunger means inwardly, the inertia wheel is unclutched from the spindlemeans, as aforesaid, and iis rotated through a small arc in a counterclockwise dinectionpas hereinafter more fully described. Five of the spring fingers are brought into 'cooperation with` the respective studs and placed under increasedtension by virtue of the change in the axial position of the rotarywheel caused by the pins 35 which, in circuit closing position. abut the inward face of the disc Zlof the spindle means, and are locked in such position by the spring 40 which at all times exerts a counterclockwise and axial outward force on the inertia wheel.
The sixth and shorter spring linger, however, breaks contact with its co-operating studupon the release of the plunger means due to the compression eie'ct of said spring 40 which opposes the inward axial movement of the inertia wheel.
When the switch is in circuit closing position, the plunger means may be depressed repeatedly to open and close the audible signal circuit, the sixth finger making contact with its Stud only when the plunge; means is depressed,'and moving away from said stud when the plunger means is released, the spring 40 normally resisting the inward axial movement of the inertia wheel to which all the spring fingers are secured.4
The spacing of the plunger means from the spindle means is such that, with the exception of said sixth spring finger, no direct action on any spring finger by the plunger means is possible when the switch is in circuit closing position. Such spacing is shown at Il between the inward end of the head of the push button 2l and the outer end of the spindle; at Il, between the inwe' i surface oi the push button iiange of the plunger means and the outer end of the housing; and at 49, between the inward end of said push button and the ouer face of the disc 2l. To secure the proper relative position of tha placed in the housing. as indicated, to view a Y marking (not shown) on the flange 30 of the inertia wheel, said marking being so arranged that it will be under said window when the switchis in circuit closing position.
As indicated in Fig. v15, a lamp 53 may lbe inserted in the closure 2| and connected to the contact members in such .manner that it, will be lighted when the switch is in circuit closing po# sition.
If desired, telephone apparatus may be inserted in the closure 2| land the button perforated, as shown at 55. to enable the user ofthe switch to communicate with a' person at a distance, for example, a person located in the room' in which the audible signall device is placed.
The switch may conveniently be assembled as follows:
The spring 31 is placed in the cylindrical cavity in the rearward face of the button 24 (Figs. 4 and 5), onel torsion end thereof resting in the groove 38 tangential to said cavity. The sleeve 25 is then placed over the spindle discs 21, 28, with the stop members 26 of said sleeve disposed in the recesses 33, cut in the disc 28, between the stop members 29 thereof. The right-hand end of the spindle 22 is then inserted in the central longitudinal bore of the button; the other torsion end of the spring 21 let intothe groove 39 in the spindle disc 21 and the sleeve moved farther to the right (Fig. 4) until the forward face of the stop members 28 abut the rearward face of the disc 21. The button is then turned in a clockwise direction to preload said spring andthen the sleeve is secured rigidly to the button in any suitable manner, as by deformation or crimping.
The contact nger ring 43" is then secured to the disc 30 of the inertia wheel, which comprises the discs 30 and 3|, by the pins 44, the ends of' which project through holes in said ring spaced correspondingly with said pins and the ends of the latter are then peened over the ring, or, in any other suitable manner, said ring may be secured to said disc 30.
The spring is then placed over the left-hand end of the spindle, one torsion end of said spring being let into the groove 42 of the inertia wheel disc 30. The spring is then turned counterclockwise from the aspect of one viewing the switch from a pointl to the right of the button 24 until the other torsion arm is parallel with the dat of the spindle, whereupon the spring is compressed by forcing it forwardly until the other torsion arm thereof takes into the groove 4| cut into the spindle at the rearward end of said fiat (Figs. 1, 3, and 9).
This completes the assembly of the preassembled switch mechanism (Fig. 4). This assembly is then inserted into the right-hand end of the housing 2U, in such manner that the flattened end portion 5U of the spindle mates with the corresponding flattened portion 5| of the interior wall groove 42' of housing 20 co-operatlng with groove 42 of disc 30, prevents g 40 from 'unwinding from its preloaded torsion position.
The screw 23 is then inserted through the lefthand end of housing 20 and screwed into the lefthand end of the spindle to hold the preassembled switch mechanism and housing ,togethen The several wires are then connected to their respective binding posts 45 and the closure 2| is screwed to the casing 20.
-The operation of the switch, referring to Figs. 16, l'l,V and. 18 which are fragmentary developments of the discs 21, 28, 30 and 3|, with certain co-operative adjunct's indicated diagrammatically. is as follows:
When the switch is in circuit opening position (Fig. 16), a stop member 26 (assuming for simpicityof explanation, only one of the co-operating members shown in triplicate in Figs. 6. 8, and
, 13) on the plunger means rests on the surfaces 33 oi the spindle means and 34 ofthe inertia wheel, thereby permitting the rotation of stop member 26 in a clockwise direction against the torsional force of the spring 31 through the arc 33. 33, and the arc 34', 34", in the annular grooves 33 and 34, which, as aforesaid, are in alignment, as are the stop member 29 of the spindle means and the tooth 32 of the inertia wheel (Fig. '1).
The pin 35 on the inertia wheel is disposed in the hole 36 of the spindle means. The spring 40 is urging the inertia wheel outwardly and maintaining the parts in the position shown in Fig. 16.
The spring 31 .is urging the plunger means outwardly and maintaining the parts in the position shown in Fig. 4.
By pressingr the plunger means inwardly, the
stop member 26, acting against the flange 30 of the inertia wheel, forcesthe latter inwardly (Fig. 17), and the inertia wheel is moved axially to such an extent that the pin 35 is forced out of its 'hole 36, whereupon the torsion spring 40, which at all times urges the inertia wheel in a counterclockwise direction, gives to said'wheel a rotary movement in a counterclockwise direction, with the result that the tooth member 32 is forced against the stop member 28. which is restrained by a stop member 28 of thespindle means from moving in a counterclockwise direction. In other words, the counterclockwise face 34" of a tooth member 32 rests against the clockwise face of `the stop 'member '26. The spring fingers are thus brought to rest on their respective studs 45, and are maintained in such position by the oompression action of the spring 40, the pins 35 remaining against the inward face of the disc 28 of the spindle means.
Immediately upon placing the switch in circui closing position, the compression action of the spring 31 will restore the plunger means to its normal axial position, thereby opening the circuit of the audible signal device, and such circuit may be closedA repeatedly by pressing and releasing the push button.
'I'he switch may be reset to normal or circuit opening position by rotating the push button in a clockwise direction. Ii' the switch is used in a hospital signalling system, a nurse or attendant responding to a call madefby a patient, will reset the switch to normal position by rotating the plunger means in a clockwise direction through the arc 33-33" (34'34), whereupon the plunger means is immediately returned counterclockwise -by spring 31 to its normal position, shown in. Figs. 8, 13, and 16.
Fig. 18 shows the position oi' the parts when the resetting operation has almost, but not quite, been completed. The co-operating faces of the stop members 29 and the teeth 31 are still separated by the length of the pin 35, although the push button is maintained in its outermost position by the compression spring 31, and therefore the stop member 26 thereof is no longer in contact with the disc 30 of the inertia wheel. Further clockwise rotation of the plunger means from the position shown in Fig. 18, will bring the counterclockwise boundaries 33', 34', of the annular grooves 33, 3l, into alignment, that is to say, the annular grooves 33. 3l, will be in alignment and the pin 35 will be iorced by the spring into the hole 36, whereupon the inertia Wheel will resume its normalv position shown in Fig. 16 and all circuits will be quickly broken, except that of the audible signal device which, as above stated, was broken when the inward pressure on the push button was released'. As soon as pin 35 enters its hole, the operator releases the button 24 which immediately is snapped back to its normal position, shown in Figs. 1 and 4, and the other rotary parts will resume their normal positions,-
as shown in Figs. 8, i3 and 16.
Having thus described illustrative embodiments of my invention without,.however, limiting the same thereto, what I claim and desire to secureby Letters Patent is:
1. An electric switch comprising in combination, a housing, stationary spindle means disposed within said housing, rotatably and axially movable plunger means mounted for rotational and axial movement on said spindle means, an inertia wheel mounted for rotational and axial movement on said spindle means, a stop member carried by said plunger means, a co-operating stop member carried by said spindle' means, means carried by said inertia wheel for engaging the stop member carried by said plunger means for rotative movement of said wheel by said plunger means, means for releasably coupling said inertia wheel to said spindle means, resilient means opposing the inward axial movement of said plunger means and urging a rotary movement of said plunger means about said spindle means in a given sense, other resilient means opposing the inward axial movement of said inertia wheel and causing a rotary movement of said inertia wheel about said. spindle means in the same sense as the aforesaid rotary movement of the plunger means upon the uncoupling of said ,inertia wheel from said spindle means, a contact member carried by said inertia wheel, and a co-operating stationary contact member carried by said housing.
2. An electric switch comprising in`combination, a housing, stationary spindle means disposed within said housing, rotatably and axially movable plunger means mounted ior rotational and axial movement on said spindle means, an inertia wheel rotatably mounted on said spindle means, co-operating clutch means carried by said spindle means and said inertia wheel, resilient means opposing the inward axial movement of said 'plunger means and urging a rotary movement of said plunger means about said spindle means in a given sense, other resilient means opposing the inward axial movement oi the inertia wheel and causing a rotary movement of said inertia wheel about said spindle in the same sense as the aforesaid rotary movement of said plunger means upon the disengagement oi' said inertia wheel from said spindle means, means limiting the rotational arc of said plunger means, and co-operating 5- contacts constructed and arranged to be opened and closed vby the rotational movement of said inertia wheel.
3. An electric switch comprising in combination, a spring actuated rotary contact member, a co-operatlng stationary contact member, rotatably and axially movable plunger means, locking means lfor maintaining said rotary contact member in circuit opening position, and means actuated by the axial movement of said plunger means for releasing said locking means.
4. An electric switch comprising in combination, a spring actuated rotary contact member, a cooperating stationary contact member, rotatably and axially movable plunger means, locking means for maintaining said rotary contact member in circuit opening position, means actuated by the axial movement oi said plunger means ior releasing said locking means, and means actuated by the rotary movement of said plunger means for resetting the rotary contact member in circuit opening position.
5. An electricswitch comprising in combination, a rotary contact member, a torsion-compression spring associated with said rotary contact member for moving 4the same rotatably or axially, rotatably and axially movable plunger means, a torsion-compression spring associatedA with said plunger means for opposing the inward axial movement thereof andqurging a rotary movement oi' the same, locking means to maintain said rotary contact member in circuit openforce of the torsion-compression spring asso-' ciated therewith to restore said rotary contact member to circuit opening position.
6. An electric switch comprising in combination, a housing, stationary spindle means disposed within said housing, a rotary contact member mounted on 'said spindle means, spring contact ilngers carried by said contact member, rotatably and axially. movable plunger means mounted on said spindle means, locking means for maintaining said rotary contact member in circuit opening position, and means actuated by the axial movement of said plunger means for releasing said locking means, one inward surface of said plunger means when in circuit opening position being spaced from said spindle means suiliciently to prevent direct action on said spring iingers by said plunger means when the latter` is in circuit closing position.
DAVID D. BEVERIDGE, JR.
REFERENCES CITED The following references are of record in the ille of this patentz' UNITED STATES PATENTS Number D claimer 2,420,768.Dam'd D. Beveridge, J Boston, Mass. ELECTRIC SWITCH. Patent dated May 20, 1947. Disclaimer filed June 15, 1951, by the assignee, I
National Pneumatic 00., I fr e.
Hereby enters this disclaimef.` to claims 3 and 4 of said patent.
[Oficial Gazette Augus' 7, 1.951.]
Disclaimer 2,420,768.-Dam'd D. Beveridge, J T., Boston, Mass. ELECTRIC SWITCH. Patent dated May 20, 1947; Disclaimer filed June 15, 1951, by the assignee, l
National Pnewnatz'c 00. I m.
Hereby enters this disclaiinlew to claims 3 and 4 of said patent.
[Oficial Gazette Augus 7, 1.951.]