US 3394403 A
Description (OCR text may contain errors)
July 23, 1968 J. J. DENNISON LIGHTED PUSHBUTTON ASSEMBLY 4 Sheets-Sheet 1 Original Filed Sept. 22, 1965 INVENTOR.
JOHN JOSEPH DENNISON 3 Q N mm mm mw Q vw IF. .fnIll I 1 mm 8 UN mural 1 N- mm 2 Q mm mm Q ATTORNEYS y 1968 J. J. DENNISON 3,394,403
LIGHTED PUSHBUTTON AJSEMBLY Original Filed Sept. 22, 1965 4 Sheets-Sheet 2 JOSEPH DENN ISON ATTORNEYS July 2 1958 J. J. DENNISON LIGHTED PUSHBUTTON ASSEMBLY 4 Sheets-Sheet 3 Original Filed Sept. 22, 1965 INVENTOR. JOHN JOSEPH DENNISON ATTORNEYS July 23, 1968 J. J. DENNISON LIGHTED PUSHBUTTON ASSEMBLY 4 Sheets-Sheet 4 Original Filed Sept 22, 1965 FIG. 8
ATTORN EYS INVENTOR JOHN JOSEPH DENNISQN A 3 3 r 2 O00 5 44%? United States Patent 3,394,403 LIGHTED PUSHBUTTON ASSEMBLY John J. Dennison, Cheshire, Conn., assignor to Maxson Electronics Corporation, Great River, N.Y., a corporation of New York Continuation of application Ser. No. 489,292, Sept. 22, 1965. This application July 6, 1967, Ser. No. 651,631
14 Claims. (Cl. 200-167) ABSTRACT OF THE DISCLOSURE A lighted pushbutton switch having a movable electrode section and spaced contacts. The electrode section is ;moved by a slidable sleeve. The sleeve operates a mechanism which causes the snap action of the switch from one contact to the other and vice versa. Upon removal of actuating forces on the pushbutton the latter returns to its rest position.
This application is a continuation of a copending application of John J. Dennison, Ser. No. 489,292, filed Sept. 22, 1965 and entitled Lighted Pushbutton Switch.
This invention relates to electric switches for controlling electric circuits and more particularly to an illuminated pushbutton switch device in which the illumination is incorporated into and associated with, the switch structure itself.
In the control of electric circuits it is desirable to provide switches which are compact and reliable and which operate with a quick or snap action to engage and disengage electrical contacts which complete or break the electrical circuits in which the switch operates. In the case of a pushbutton switch it is also desirable that illumination means he provided so that the switching state of the switch can be readily ascertained by the operator.
It is also desirable to provide, in an illuminated pushbutton snap action switch, a means for mounting the illumination means so that the illumination means remains stationary when the pushbutton is operated thereby providing greater reliability and resistance to shock and vibration which would tend to shorten the life expectancy of the electric bulb associated with the illumination means.
Another reason for providing for a stationary illuminating means is that the electrical contacts connected to the bulb lamp terminals need not be movable or flexible.
Another feature which would be desirable in an illuminated pushbutton switch would be the provision of means for retaining the pushbutton lamp assembly within the switch, and the provision of a simple means for removing the pushbutton lamp assembly and for reinserting the pushbutton lamp assembly to replace the light bulb without removing the entire switch assembly from its housing.
It is an object of this invention to provide a compact, rigid, illuminated pushbutton snap action switch.
It is a further object of this invention to provide an illuminated push button switch in which the illumination means is stationary with respect to the pushbutton means.
It is a further object of this invention to provide an illuminated pushbutton snap action switch in which the pushbutton lamp assembly may be readily removed from the switch housing so that the lamp can be replaced without the removal of the entire switch assembly from its housing.
A further object of this invention is the provision of an improved plunger or pushbutton operated electric switch of compact size providing for snap action of the switching contacts and having an illuminated pushbutton ice for ready identification of the state of the switching device.
The illuminated pushbutton snap action device of the invention includes an illumination means disposed between a snap action switch and a pushbutton and also includes a sleeve which operatively connects the pushbutton and the switch. Actuation of the pushbutton causes actuation of the switch. The switch is a generally cylindrical body having switch contact members at one end and a pushbutton at the other. The switch is adapted for mounting in an opening in a panel. The switch can be mounted on the panel by either a threaded nut or by projecting spring fingers which connect the switch body to the panel housing. The pushbutton and sleeve operate to depress a plunger or a pawl which in turn engages an abutment of a cam causing a rotary motion of the cam from one fixed position to a second fixed position. The rotary action of the cam moves one end of an extension spring to its overcenter position thereby transferring a contact which is part of a blade, from one position to a second position with a positive snap action. Upon removal of the applied actuator force on the pushbutton a spring returns the pushbutton, the pawl guide and the pawl to the original free position making it ready for subsequent cycles of alternate on-ofi pushbutton operation.
The operation of the unique snap action switching con struction and the unique lamp and button retention device which permits ready replacement of the lamp and pushbutton, as well as other features and objects of this invention, will become more apparent from a reading of the following specification and appended claims studied in conjunction with the drawings, in which:
FIG. 1 is a longitudinal sectional view of an illuminated pushbutton switch according to the present invention;
FIG. 2 is a partly sectional view of the switch body taken along line 2-2 of FIG. 1;
FIG. 3 is a side longitudinal sectional view of an illuminated pushbutton snap action switch according to the present invention;
FIG. 4 is an enlarged detail sectional view of the view shown in FIG. 3 showing the pawl guide moved to one of its operating positions;
FIG. 5 is an exploded perspective view of a switch according to this invention showing the basic elements of the switch construction;
FIG. 6 is an exploded perspective view showing the elements of the snap action switch;
FIG. 7 is an end view of the switch according to this invention showing the electrical contact end of the switch;
FIG. 8 is a cross sectional view of the switch along the lines 88 of FIG. 4;
FIG. 9 is a cross sectional view of the illuminated pushbutton switch taken along lines 99 of FIG. 4;
FIG. 10 is a cross sectional view of the illuminated pushbutton switch taken along lines 1010 of FIG. 4;
FIG. 11 is a cross sectional view taken across lines 11-11 of FIG. 3; and
FIG. 12 is an example of one possible wiring connection.
Referring now to the drawings in which similar elements are identified by the same numerals, there is provided an outer cylindrical housing or casing 11, having a forward threaded portion 12 (FIG. 2). A decorative bezel 13 has mounting tabs 14 (FIG. 2) extending therefrom. The bezel 13 is mounted on the forward portion of the electrically non-conductive housing 11 by bending the tabs 14 into the recessed portion 15 of the housing 11. A mounting nut 16 (FIG. 3) is threaded on the forward portion of the housing in order to mount the switch assemly on the panel, fragmentarily illustrated in action in FIG. 3. A lamp 17, which is mounted in lamp base 18,
having an electrical terminal at the bottom end thereof, is mounted within the housing in a manner described below.
At the rear end of the switch is a tubular member 21, which contains the elements of the switching mechanism, and a base member 22, made of an insulating material, which is placed on the rear end of the structure. The housing 11, which contains electrical contacts 23 and 23b having end portions 23a which extend from the switch housing when the switch is assembled, is disposed around the tubular member 21. The lamp 17 is illuminated when a voltage appears across terminals 23, due to the operation of the switch, thereof. Thus the lamp may serve to indicate the position of the switch contacts.
At the forward end of the switch housing 11, pushbutton 24, formed from a transparent light transmitting material, is slidably disposed in the opening 25 of the bezel 13, and is placed over the lamp assembly 17, 18. The pushbutton and lamp assembly are retained in the housing 11 in a manner described below.
The switching mechanism is inserted through the rear end of the switch, and retaining base member 22 is placed thereover and fixed to the housing as shown in FIG. 8 by means of a pair of pins 25 each of which extend through aligned holes 26 in parts 11 and 21, and, as shown in FIG. 8, into an aligned recess 27 formed in the base member 22. When the switch is so assembled, the ends of two stationary switch terminals 28 and the end portion 29a of a stationary center electrode 29 extend from the rear portion of the switch.
Within the switch housing is a switching mechanism which includes tension spring 30, a blade 31 bearing on one end a common contact 33 and connected to spring by the end hook portion of the spring being placed through the slot 32 of blade 31. The blade 31 is pivoted to the center electrode 29 by resting in an indentation in the inner end of the center electrode and is held firmly in place by the tension spring 30. (See FIGS. 4 and 6.) A hollow cam 34 carries a transverse shaft 35 in its interior and is also located within the switching unit. As seen best in FIG. 3, the rotatable cam 34 is provided with trunnions 42 which are mounted in cutouts 51 which are formed in the ears of common contact 29. These cutout portions are aligned transversely to the axis of the tubular member 21. The other end of tension spring 30 is secured to the shaft 35 to place the trunnion axis intermediate the point of attachment of each end of the spring to best form a snap action toggle. This tension spring thus serves to hold the tiltable member 34 with its trunnions in the cut-outs or bearings 51 and also to hold the end of the blade 31 in its recess in the center electrode. In addition the spring causes the member 34 to take a position to one side or the other of a position in which a straight line interconnecting the points of attachment of the spring intersects the trunnion axis. A pawl guide 38 having extensions 39 which engage grooves 40 within the switch body 11, co-operates with the pushbutton to cause axial motion of a pawl 40a. The pawl is held against the pawl guide by a compression spring 41 thus centering the pawl, when the pushbutton is not depressed, and maintaining the pawl in alignment with the axis of the housing. The compression spring 41 also exerts a returning force upon the pushbutton assembly. The pawl causes the cam 34 to rotate to effect the snap action switching in a manner which is described below.
When the unit is in its assembled position the pushbutton 24 and the lamp assembly 17, 18 are retained in the housing 11 by means of the detent 43 at the inner end of the resilient spring member 23. The detent 43 engages the flange 19, on the lamp base 18, retaining both the pushbutton 24 and the lamp base 18 connected to the housing 11. The retention prevents movement of the lamp while allowing the axial motion of the pushbutton 24 to actuate the switch mechanism in a manner described below. An over-travel stop 44, located on the interior of housing 11, limits the amount of button travel and protects the switch mechanism from being damaged by excessive button travel.
In operation, the hollow pushbutton 24 is depressed, so that the elongated side portions 45 of the pushbutton contact the pawl guide 38 at extensions 39. The pawl guide, under the urging of the pushbutton 24, moves axially when acted upon by the pushbutton 24. The pawl 40a in its free position remains parallel to the axis of the pawl guide 38 and is held in this position in the pawl guide recess 46 by the force exerted by compression spring 41 on bar 37 of the pawl. The pawl remains seated in the recess 46 (FIG. 4) until further motion of the button causes the end edge 48 of the pawl to engage the inclined surface 49 of the cam 34. Still further movement of the pushbutton causes the pawl to rotate or pivot within guide recess 46 by the action of the pawl against the inclined surface 49 of the cam until the end edge 48 of the pawl engages the cam abutment 3412.
Additional travel of the pushbutton in combination with the corresponding movement of the pawl imparts a rotary motion to the cam 34 from one pre-determined end position to a second pre-d-etermined end position. The rotary action of the cam moves the end of the tension spring 30 (which is aflixed to shaft 35) so that the end of the tension spring moves to its over-center position thereby transferring electrical contact 33, which is affixed to the end portion of blade 31, from one end position to a second end position with a positive snap action. Upon removal of the applied actuator force on the pushbutton the returning spring 41 exerts the necessary force to return the button, pawl guide and pawl to the original free position making the switch ready for subsequent cycles of alternate, on-otf pushbutton operation.
The above operation and structure can be modified so that switching action can be changed to a momentary action switch where the switch contact 33 transfers from one end position to a second end position and upon release of the applied force on the pushbutton the contact 33 transfers back to its original position. This modification is accomplished by changing the relationship of the over-center position of blade 31 with respect to the location of shaft 35 and the pivot axis formed by trunnions 42 of the cam 34. This relationship is such that the angular movement of the shaft 35 (with spring 30 attached thereto) about this pivot axis 42 must be restricted to a pre-determined position to prevent shaft 35, pivot axis 42, and the blade 31 over-center position from being co-linear while permitting the blade 31 and the tension spring 30 to pass through the over-center position, transferring contact 33 from one position to a second position. Upon release of the applied force on the button the contact 33 returns to its original position.
An important feature of this invention is the unique lamp and button retention device that permits easy and fast replacement of the lamp and push button without the aid of special tools and without the necessity of disassembling the whole switching device when it is desired to replace the lamp. At the same time this unique construction permits actuation of the pushbutton without a resultant motion of the lamp.
The pushbutton 24 is formed as an elongated tubular member having a closed end 50 serving as a pushbutton surface, and having slots through the walls thereof forming skirts and an internal shoulder. The lamp base 18 which has a flange 19 is inserted from the rear of the pushbutton, forcing the skirts apart. As shown best in FIG. 1 the lamp is assembled in the pushbutton by inserting the lamp and lamp base into the bottom opening 53 of the pushbutton until the flange 19 of the lamp base comes into contact with detents 54. The additional force applied to the bottom of the lamp flange 19 in combination with detents 54 deflects the flexible member or skirts outward permitting the flange 19 to enter into the recess 56 of the button thereby capturing the lamp in the button. A direct pull on the lamp flange is required to accomplish the reverse operation of removing the lamp assembly from the pushbutton. The pushbutton contains two longitudinal grooves 52 spaced 180 degrees apart and formed in the outside of the pushbutton. The housing 11 also contains two mating lugs 55 which are located on the inside of the housing. To assemble the button and lamp into the housing assembly, the button is inserted into the front opening in the housing until the bottom of the button stops against the top surfaces of the lugs. The button is then manually rotated until lugs 55 and grooves 52 are in line with one another thus permitting lugs 55 to enter the grooves 52 in the pushbutton. This prevents the button from rotating and the button is then guided until the inclined planes 58 of the button grooves 52 come into physical contact with lugs, whereupon the applied button force acting through the inclined planes 58 against the housing lugs 55 imparts a rotary motion to the button 24 thereby permitting lugs 55 to enter the upper portion of grooves 52, permitting the button to travel axially within the housing. Any additional force applied to the button will permit flange 19 of lamp base 18 to engage and overcome forces exerted through detent 43 thereby capturing both the lamp and button in the housing assembly. Detent 43 yieldably prevents lamp movement to the left, and element 23b engages contact 20 to prevent lamp movement to the right, as viewed in FIGS. 3 and 4, while axial motion of the button to operate the switch mechanism is unrestraining. Upon release of the applied actuator force the button will move to its installed position remaining captured to the housing assembly.
The a butments 62 in the bottom grooves 52 and detents 54 prevent the button 24 from flying out of the unit when the button is depressed and snap released. To remove the button and lamp from the housing a direct pull on the projecting portion of the button is required to over-come the retaining force of detent 43. Upon release of the detent a slight rotary motion of the button is required to clear abut-ments 62 for removal of the button. With the button removed from the unit a direct pull on the lamp flange 19 will remove the lamp assembly from the button. A new lamp assembly may then be inserted in the pushbutton by pushing it in a sufficient distance to eflect engagement of the flange on the lamp base with the shoulder and thus when the button and lamp are inserted in the housing they are retained by the base engagement with lamp contact 23b. The lamp assembly thus retains the pushbutton in place and yet the lamp assembly does not move axially upon depression of the pushbutton.
The switch assembly may either be mounted on the panel by a conventional thread shoulder and nut type of mounting arrangement or by a set of resilient spring fingers which are disposed around the perimeter of the housing 11. The switch housing is inserted into the panel mounting hole. Spring fingers would be deflected inwards thereby permitting entry of the switching unit into the housing hole. When the flange of the switch housing contacts the top surface of the mounting panel, the spring fingers would then be deflected against the mounting panel to provide the necessary lateral force against the sides of the mounting hole to retain the unit to the panel.
It will be seen that with the structure described above the pushbutton 2-4 has a front exposed end which is at least in part light-permeable so that when the lamp 17 is illuminated the light therefrom will be visible to the operator. While in the illustrated example the material of the push-button is made of any suitable color, while being transparent, it is perfectly possible to have an opaque push button provided simply with an opening through which the light of the lamp 17 will be rendered visible to the operator. The elongated housing 11 guides the pushbutton 24 for longitudinal movement and a pair of retaining means are formed by the above-described structure and are respectively carried by the housing 11 and the pushbutton 24 for yieldably retaining the lamp assembly 17, 18 at a given position within the housing 11 during reciprocation of the push button 24 and for retaining the lamp assembly 17, 18 within the hollow pushbutton 24 until after the latter is removed from the housing 11, at which time the other of the retaining means can yield to permit removal of the lamp assembly 17, 18 from the interior of the pushbutton 24. Thus, it will be seen that one of these retaining means is formed by the elongated electrically conductive members 23 and 23b. These members of course, form part of the electrical circuit for the lamp assembly 17, 18. Thus it will be seen that the elongated electrically conductive member 2311 engages the contact 20 of the lamp 17 while the elongated member 23 engages the lamp base 18. The yieldable detent 43 of the member 23 prevents movement of the assembly 17, 18 to the left while the member 23b engages contact 20 to prevent movement of this assembly to the right, as viewed in FIGS. 3 and 4, and in this way these elements 23 and 23b form one of the pair of yieldable retaining means yieldably retaining the lamp assembly 17, 18 at the pozition thereof illustrated in FIGS. 3 and 4.
The other of the retaining means is of course formed by the springy skirt or wall portions of the pushbutton 24 which is respectively provided with the projections 54 which form the detents engaging the flange or projection 19 of the lamp base 18 for retaining the assembly 17, 18 Wi'hin the hollow pushbutton 24, as indicated in FIG. 1. Thus, with this. construction the retaining means 23, 23b carried by the housing 11 will maintain the assembly 17, 18 in the illustrated position during reciprocation of the pushbutton 24, and the housing 11 itself prevents yielding of the springy wall portions of the pushbutton 24 which carry the detents 54 so that while the pushbutton 24 is in the housing 11 the detents 54 cannot yield to permit displacement of the assembly 17, 18 out of the hollow pushbutton 24. However, with a strong enough pull the operator can cause the detent 43 to yield so that the entire pushbutton together with the assembly 17, 18 will be displaced out of the housing, and then the springy skirt or wall portions of the housing 24 can yield to permit displacement of the lamp assembly 17, 18 out the pushbutton when, for example, it is necessary to replace a lamp 17. Of course, the parts are reassembled through the reverse of these steps.
Furthermore, it will be noted that with the structure of the invention the center electrode 29 has a bearing formed by the elongated V-groove which receives the free end portions of the blade 31 to support the latter for tilting movement. This V-groove is of course situated in the plane through which the left end of the snap-spring 30 must pass during the over-center action of the structure to snap the blade 31 between the stationary contacts 28. When the parts are at rest the pawl tmeans 40a is situated in the rest position shown in FIG. 3 where this pawl also is situated in the plane in which the V-groove which receives the blade 31 is located. The central electrode 29 in addition has a bearing means formed by the recessed ear portions which receive the trunnions 42 so as to define a pivot axis for the hollow cam means 34 provided with the projections 34a alternately situated in the path of movement of the pawl. Of course, the shaft 35 is carried by and extends across the hollow interior of the cam means 34 to receive the left end of the snapspring, 30, which is hooked at its right end onto the blade 31, and it is to be noted that it is the movement of the axis of the shaft 35 to one or the other side of the plane which includes the pivot axis of the cam 34 and the tilting axis of the blade 31 which produces the overcenter action causing the blade 31 to be snapped between the stationary contacts 28.
The guide means 38 is formed with the elongated V-rib 46 whose crest is also situated in this latter plane and this rib is received in the elongated V-groove at the left end of the paw-l, as viewed in FIGS. 3 and 4, this V-groove extending along the transverse pawl bar 37 against which the spring means 41 presses to yieldably maintain the pawl means in the rest position shown in FIG. 3, and of course it is this spring 41 which acts not only on the pawl means, but also on the guide 38 and through the latter pushbutton 24 to return the latter to its outer initial position.
The electrical structure of the switch can be used for many different purposes and the lamp assembly 17, 18 can be hooked into the circuit in many different ways. FIG. 12 shows one possible circuit arrangement in which the center electrode 29 and one of the contacts 28 are situated in a circuit X which is shown closed in FIG. 12 while the other contact 28 and the center electrode 29 are situated in a circuit Y. In the illustrated circuit the lamp assembly is electrically connected with the left contact 28 of FIG. 12 and with a center electrode so that whenever the blade 31 moves to the illustrated position where the circuit X is closed the lamp 18 will become illuminated to indicate to the operator that the circuit X is closed while the circuit Y is open. This circuit Y may simply be an open circuit so that the structure operates only to close and open the circuit X, or the circuit Y may be a completely independent circuit, and the closing of this circuit will be indicated by the extinguishing of the lamp 17. On the other hand, it is perfectly possible to connect the lamp assembly 17, 18 into a completely separate circuit which is simply closed and opened when an entire machine is turned on or off or which can be closed when night lights turned on so as to render the pushbutton visible at night, or any other purpose may be served by the electrical structure, the connections of FIG. 12 being illustrated only by way of example.
While particular embodiments of this invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made thereto without departing from the invention in its broader aspects and, therefore, the scope of this invention and the true spirit thereof shall be accordingly defined by the appended claims.
What is claimed is:
1. In an illuminated pushbutton control device the arrangement comprising a pushbutton having a flexible elongated side portion, said side portion having a recess and a detent at the inner wall thereof; and a lamp holder having a flange around the periphery thereof, said flange engaging said detent and said recess thereby capturing said lamp to said pushbutton.
2. An illuminated pushbutton control device comprising a housing having a longitudinal opening therethrough, electrical contacts connected to one end of said housing, a common contact, a snap acting toggle to place said common contact in contact with one of said electrical contacts, a rotatable cam, a pawl urging said cam to rotate thereby causing said snap action toggle to operate, a pawl guide urging said pawl against said cam, an at least partly light permeable pushbutton inserted into one end of said housing and having an elongated end engaging said pawl guide, a compression spring biasing said pawl against said pawl guide and producing a return force on said pushbutton, a lamp assembly substantially stationarily arranged within said housing, means for slidably retaining said lamp assembly to said pushbutton, and means for retaining said pushbutton and said lamp assembly to said housing so as to allow longitudinal motion of said pushbutton substantially without moving said lamp assembly.
3. In a switch, a switch housing, a hollow pushbutton slidable in said switch housing and having a front exposed end accessible to an operator, said front exposed end of said pushbutton being at least partially light-permeable, a lamp assembly situated in said hollow pushbutton and adapted to receive a lamp which, when illuminated, provides light visible through said light-permeable front end of said pushbutton, and a pair of yieldable retaining means respectively carried by said switch housing and said pushbutton and engaging said lamp assembly for retaining the latter at a given position in said switch housing during actuation of said pushbutton while releasing said pushbutton and lamp assembly therein for removal from said switch housing when the force of the yieldable retaining means carried by said switch housing is overcome and releasing said lamp assembly from the interior of said pushbutton after the latter has been removed from said switch housing and the force of the yieldable retaining means carried by said pushbutton is overcome.
4. The combination of claim 3 wherein said yieldable retaining means carried by said switch housing includes elongated electrically conductive members engaging said lamp assembly for connecting the latter into an electrical circuit illuminating a lamp received in said lamp assembly.
5. The combination of claim 4 wherein said lamp assembly includes a lamp base having an exterior flange, one of said electrically conductive members of said retaining means carried by said switch housing having a springy detent engaging said flange for yieldably preventing movement of said lamp assembly outwardly from said switch housing, said lamp assembly including a center contact for a lamp carried by said lamp base and the other elongated conductive member carried by said switch housing engaging said center contact to prevent movement of said lamp assembly inwardly.
6. The combination of claim 5 wherein said springy detent is yieldable for selectively moving said lamp assembly out of said switch housing together with said pushbutton.
7. The combination of claim 6 wherein the yieldable retaining means carried by said pushbutton is in the form of a springy elongated wall of said pushbutton capable of moving relative to the remainder of said hollow pushbutton and having a detent engaging said flange of said lamp base for retaining said lamp assembly in said hollow pushbutton, said switch housing cooperating with said detent of said retaining means carried by said pushbutton for preventing yielding of the latter detent while said pushbutton is in said housing.
8. The combination of claim 3 wherein said yieldable retaining means carried by said pushbutton is in the form of a springy wall portion thereof capable of yielding with respect to the remainder of said pushbutton and carrying a detent, said lamp assembly including a lamp base provided with a projection engaged by said detent for yieldably preventing removal of said lamp assembly from the interior of said hollow pushbutton, said switch housing cooperating with said springy wall portion of said pushbutton to prevent the latter from yielding until said pushbutton is removed from said switch housing.
9. In a switch, a center electrode having a bearing portion formed with an elongated groove situated in a predetermined plane, a pair of stationary contacts respectively situated on opposite sides of said plane, a switch blade having an edge situated in said groove and tiltable between said stationary contacts, bearing means carried by said center electrode and providing a pivot axis situated substantially in said plane and extending substantially parallel to said groove, cam means pivotally supported by said bearing means for turning movement about said pivot axis, an elongated snap-spring connected to said cam means and to said blade for snapping the [latter between said stationary contacts during turning of said cam means about said pivot axis to displace one end of said snap-spring from one to the other side of said plane, pawl means having a rest position situated substantially in said plane, spring means acting on said pawl means for yieldably maintaining the latter in said rest position thereof, a pawl guide engaging said pawl means for guiding the latter for tilting movement to one or the other side of said plane, and a pushbutton shiftable by an operator, said guide being responsive to and arranged to transmit the motion of said pushbutton to said pawl means and to place said pawl means in engagement with said cam means for tilting the latter about said pivot axis to displace said snap-spring at its end connected to said cam means from one to the other side of said plane so as to snap said blade from one to the other of said stationary contacts, said spring-means acting on said guide and through the latter, on said pushbutton, to return the latter and said guide to a rest position where said pawl means is situated substantially in said plane in readiness for changing the position of said blade during the next actuation of said pushbutton by an operator.
10. The combination of claim 9 wherein said center electrode has a pair of ears formed with aligned notches which form said bearing means, said ca m means having a pair of trunnions situated in said notches to be guided for turning movement thereby and having a hollow interior and a shaft carried in said hollow interior and receiving one end of said snap-spring, said cam means having a pair of opposed projections alternately situated in the path of movement of said pawl means during tilting of said cam means for moving said blade between said stationary contacts.
11. The combination of claim 9 wherein said guide is hollow and has an elongated rib of V-shaped cross section having its crest situated in said plane, said pawl means including an elongated transverse bar formed with a V-groove receiving said rib, said spring means engaging said bar of said pawl means for urging the latter against said rib of said guide.
12. In an illuminated pushbutton control device, the arrangement comprising: a housing having a longitudinal portion therethrough, a lug disposed within the inner diameter thereof, a pushbutton having an elongated side portion, said side portion having a longitudinal groove extending into an inclined plane, said lug engaging said groove and inclined plane preventing said button from rotating within said housing and permitting axial motion of the button within said housing, a lamp assembly and a detented lamp contact mounted in said housing, said lamp assembly engaging said detented lamp contact to retain said lamp assembly to said housing.
13. In a pushbutton control device, the arrangement comprising: a housing having a longitudinal portion therethrough, a lug connected to said housing and dis posed within the inner diameter thereof, a pushbutton having a front end accessible to an operator and having an elongated side portion, said side portion having a groove With a first and second groove portion respectively extending in longitudinal direction thereof and laterally offset with regard to each other, and an intermediate substantially circumferentially extending groove portion, said second groove portion being open at that end of said side portion which is remote from said front end to permit axial insertion into and withdrawal of said lug from said groove, said lug normally engaging said first groove portion and being locked therein to prevent rotation of said pushbutton during normal use, and to permit axial motion of said pushbutton in said housing, said pushbutton being rotatable relative to said housing when said lug is in said intermediate groove portion so as to permit transfer of said lug from said first to said second groove portion for withdrawing said pushbutton from said housmg.
14. A switch according to claim 9 wherein the angular movement of said cam means about said pivot axis is limited so as to prevent the blades over-center position from being co-linear with said pivot axis and with the connection between said snap-spring and said cam means while permitting the end of said blade remote from said groove and said snap-spring to pass beyond the overcenter position, whereby said last-mentioned end of said blade makes temporary contact with one of said stationary contacts and returns to contact with the other of said stationary contacts upon release of said pushbutton.
References Cited UNITED STATES PATENTS 2,902,559 9/1959 Morris 20068 3,030,465 4/ 1962 Roeser. 3,183,333 5/1965 Golbeck.
ROBERT K. SCHAEFER, Primary Examiner. H. O. JONES, Assistant Examiner.