US2529716A

US2529716A - Snap switch

Info

Publication number: US2529716A
Application number: US37724A
Authority: US
Inventors: Adrian J Vakavik; Mervin B Arisman
Original assignee: CHICAGO TELEPHONE SUPPLY CORP
Current assignee: CHICAGO TELEPHONE SUPPLY Corp
Priority date: 1948-07-08
Filing date: 1948-07-08
Publication date: 1950-11-14
Anticipated expiration: 1967-11-14

Description

Nov. 14, 1950 A. J. vAKsvlK Erm. 2,529,716

SNAP SWITCH Filed July s, 194s s sheets-sheet 1 Nov. 14, 1950 A. J. vAKsvlK ErAl. 2,529,716

SNAP swITcH Filed July 8, 1948 3 Sheets-Sheet 2 Nov. 14, 1950 A. J. vAKsvlK ET AL 2,529,716

SNAP swITcH Filed July s, 194e s sheets-sheet s FOLLOW THROUGH? ENGHGENENT 73 L20 A OFF' PosmoN SNAV poss-non "ON POS'TION Y mi@ 1h19. 6a. QM). 6 b.

w @Mmm hlt). 70. 7b. 7c.

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Patented Nov. 14, 1950 SNAP SWITCH Adrian J. Vaksvik and Mcrvin B. Arisman, Elkhart, Ind., assignors to Chicago Telephone Supply Corporation, Elkhart, Ind., a corporation of Indiana Application July 8, 1948, Serial No. 37,724

13 Claims.

This invention relates to electrical switches and has more particular reference to snap switches of the type which are mounted on the back of volume controls for radio sets as in Patent No. 2,304,479 issued December 8, 1942 to Newton C. Schellenger.

As brought out in the aforementioned patent, combination controls oi this type may be employed in many diierent types of apparatus but are particularly adapted for use with small radio receivers by reason of their compactness. Besides compactness, simplicity of design and assembly and low manufacturing cost are the major prerequisites of control instruments of the type here in question.

Hence, it is an object of the present invention to provide a combined switch and volume control so designed that material savings can be eiected in the cost of production by virtue of improvements in the switch mechanism of the instrument.

More specifically it is an object of this invention to provide a snap switch of the character described wherein greater simplicity and lower manufacturing cost is achieved through the elimination of the customary pivot post for the switch arm and its actuator.

` ticularly deined by the appended claims, it

Another object oi this invention resides in the i provision of an improved snap switch mechanism wherein the switch arm is operated by a blade type actuator stamped from sheet metal.

Still another object of this invention resides -in the provision of a snap switch of the character described wherein the switch arm is pivotally supported from its actuator for rocking motion about an axis directly adjacent to the side wall of the housing in which the switch mechanism is received.

A further object of this invention resides in the provision of combined contact and terminal posts for the switch mechanism which are of improved design and which may be secured to the insulating terminal plate of the switch mechanism without use of the customary rivets and without danger of the posts tilting.

Another object of this invention resides in the provision oi an improved manner of transmitting driving force from the common operating shaft of a combined switch and rheostat to the switch actuator.

With the above and other objects in view, which will appear as the description proceeds, this invention resides in the novel construction, -combination and arrangement of parts substantially as hereinafter described and more parbeing understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope or the claims.

The accompanying drawings illustrate one complete example of the physical embodiment of the invention constructed according to the best mode so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a view partly in side elevation and partly in section illustrating the switch of this invention in place on the back of a volume control;

Figure 2 is a cross sectional view through Figure 1 taken on the plane of the line 2-2 and looking into the interior of the switch housing from the open end thereof, the component parts of the switch mechanism being shown in switch oir position;

Figure 3 is a view similar to Figure 2 but showing the component parts of the switch mechanism in a switch on" position;

Figures 4a, 4b and 4c are perspective views of the switch housing, the switch mechanism, and the volume control housing respectively, with these units separated from one another but in their proper order of assembly;

Figures 5a, 5b and 5c are diagrammatic views illustrating the improved manner in which the switch actuator is engaged and driven by the driving lugs on the driver for the actuator;

Figures 6a, 6b and 6c are similar diagrammatic views illustrating a conventional manner of driving the switch actuator by means of a single driving lug on the driver;

Figures 7a, 7b and 7c are diagrammatic Views showing three dierent positions of the bridging contacter with relation to the stationary switch contacts; and

Figure 8 is a perspective view of the combined stationary Contact and terminal post of this invention.

Referring now more particularly to the accompanying drawings in which like numerals indicate like parts, the numerals 5 and 6 designate the switch and volume control units respectively of a combined switch and volume control instrumentality of the type which is especially adapted for use with small radio receivers.

The volume control unit 6 forms no part of the present invention and for this reason has not been shown in detail. It is suicient to note that the rheostat mechanism (notA shown) is mounted within a substantially cup-shaped 3 housing 1 having a back or end wall 8, and that the common operating shaft 9 of the instrumentality projects from the front of the housing 1 and carries a driver I on its inner end inside theV housing.

The switch mechanism is contained within a cup-shaped housing II'having a cylindrical side y disc of insulating material clamped against anf inturned flange I6 at the rear of the switch housing by indentations I1 in the housing side wall. These indentations also serve to offset the tangs I3 inwardly from the cylindrical boundary of the side wall, and enable the coaxial cylindrical side walls of the switch and volume control housings to be substantially the same diameter.

At one side of the housing the flange IB is extended inwardly a substantial distance, as at I9, and at this portion of increased radial width of the flange the side wall of the switch housing is struck in as at to provide an indentation extending the full height of the side wall. Adjacent to the base, the indentation engages in a marginal notch 22 in the base to properly locate the same on the housing and to prevent rotational shifting thereof relative tothe housing.

The sides of the notch 22 in the base converge inwardly toward a restricted passage 23 leading into a substantially triangular opening 24 in the Abase covered by the flange extension I9,for a purpose to be described later.

Mounted on the insulating base I5 are stationary contacts 26 which are formed integral with terminal posts 21, the contacts being exposed at the inner face of the base while the posts project from the outer face of the base as seen best in Figure 1 to provide for the attachment of electrical conductors thereto.

The combined contacts and terminal posts are of novel construction, and as seen best in Figure 8, each of the posts comprises a relatively flat T-shaped strip of metal having a stem 28 and a head 29, the overhanging extremities 30 of which are bent fiatwise around toward the opposite faces of ythe post so that the underside of the head on the post engages the inner face of the insulating base I5 at areas spaced outwardly of the opposite side edges of the post and outwardiy of each face of the post. The stem 28 of each of the posts projects through a substantially close fitting slit-like aperture in the base, and portions of the stem at opposite side edges thereof are swedged as at 3l against the outer face of the insulating base to clamp the same between the swedged portions and the oppositely curled extremities 30 of the contact head on the post.

This construction provides for anchoring the posts to the base in an exceptionally rigid manner by virtue of the engagement of the oppositely curled extremities of the contact heads with the inner face of the insulating base at areas spaced a distance outwardly from each of the side edges and from each of the faces of the posts. Edgewise or ilatwise tilting of the posts in their apertures is thus effectively precluded.

The terminal posts are anchored in the insulat- 4 ing base I5 in such positions that thecurled end of one contact head is opposite one of the curled ends of the other contact head, as seen best in Figures 2, 3, 7a, 7b, and 7c, and with these adjacent curled ends substantially remote from the indentation 20 on the side wall but substantially in line with said indentation.

The stationary contact heads are adapted to be electrically bridged by a hairpin type bridging contactor 33 moved to and from a bridging position by a disc-like switch arm 34. The switch arm is made from a flat piece of insulating material and has the bridging contactor 33 loosely mounted thereon between it and the inner face of the insulating base so that the contactor is free to adjust itself to the contacts during closure of the switch as will be apparent from Figures 2, 3, 7a, 1b and 7c.

Switch opening and closing motion is imparted to the switch arm by means of an actuator 3B oi novel construction. The actuator extends endwise between the end wall 8 of the volume control housing and the base I5 of the switch housing, and is of the blade type. Preferably, the actuator is stamped and punched from sheet metal to provide a. flat blade-like body portion 31, and a tail portion 38 bent flatwise slightly out of the plane of the blade portion 31.

The outer edge of the tail portion is notched as at 40 to provide a pair of locating lugs 4I spaced along the length of said edge of the tail. These lugs project into longitudinally spaced openings 42 in the indentation 20, one of the notches opening to the rim of the switch housing. and extending toward a substantially central circumferential slit 43 in the indentation, while the other of said notches opens into said slit and extends toward the base I5 of the housing. The

. lugs serve to locate the actuator on the housing side wall with the inner surface of the indentation engageable by an edge 44 of the actuator defining the bottom of the notch 40 to fulcrum the actuator for back and forth rocking motion about anaxis perpendicular to the end wall of the housing and directly adjacent to the housing side wall.

The side edge of each of these lugs 4I facing the base I5 is also notched, as at 45, so as to provide hooks 46 on the extremities of the lugs facing in the same direction, that is, toward the 'base or end wall of the switch housing. The

hooked extremities 46 of the lugs engage over the outer surfaces of the indentation 20 to hold the actuator pivotally connected with the housing side wall and require that the actuator be moved bodily toward the open end of the switch housing for dissassembly. Hence, when the switch housing is secured in place upon the end wall 8 of the volume control housing, the end wall 8 of the volume control housing overlies the outermost lug 4I on the actuator holds the same against disassembling motion.

Attention is directed to the fact that the actuator notch 45 adjacent to the base I5 of the switch housing is located to define an edge 44 which also is engageable with the inner surface of the indentation and aligns with the edge 44 of the actuator to cooperate therewith in fulcruming the actuator for swinging or rocking rotion.

As stated previously, the blade-like body 31 of the actuator extends edgewise between the end walls of the switch and volume control housings, and has its rearmost end 48 received in the substantially triangular opening 24 in the insulating base I5. The foremost end 48 of the body projects out of the open end of the switch housing and into the interior of the volume control housing through a triangular opening 50 therein opposite to and of the same shape as the opening 24 in the insulating base l5.

In this manner the coplanar side edges and 52 of the triangular openings are adapted to be engaged by one dat face of the body 31 of the actuator to dene one limit of rocking motion thereof, while the coplanar side edges 53 and 54 of the triangular openings are. adapted to be engaged by the opposite face of the body 31 of the actuator to dene the other of its limits of rocking motion. More speciiically, the edges 5I and 52v denne the switch on position of the actuator seen in Figure 3, while the

edges

53 and 54 dene the switch off position of the actuator seen in Figure 2.

It is also important to note that the cooperating sets of abutments which define the limits of rocking motion of the actuator are so disposed as to position the blade -like body portion 31 of the actuator in a position pointing edgewise toward the axis of the housing in the switch "ofP condition of the actuator, and to dispose the body portion 31 in a position at which one flat face thereof substantially faces the axis of the switch housing in the switch on condition of the actuator.

Also it will be seen that the blade-like body portion is oiset or eccentric with respect to its pivot axis, and that the angular tail portion 38 on the actuator is carried an equal distance to either side of a plane containing the actuator and housing axes during motion of the actuator between its limits of motion. Because of this fact the notches 42 cut in the indentation 20 on the housing side wall may be proportioned to minimize atwise tilting of the actuator,

The switch arm 34 has a corner portion 56, the apex 51 of which is received in the slit-like aperture 43 in the indentation 20. This corner portion of the switch arm also has a relatively large triangular hole 58 therein through which the body of the actuator and a portion of the tail 38 thereon projects, so that the corner portion 56 of the switch arm encircles the actuator between the pivot lugs 4l thereon as seen best in Figure 1.

The edge 44 on the actuator tail projects into the corner of the triangular hole 58 in the switch arm adiacent to the apex 51 of the arm to provide a fulcrum upon which the switch arm is supported for swinging motion in a plane parallel to the end walls of the switch and volume control housings. Consequently, the edge 44 on the actuator has the dual function of fulcruming the actuator and the switch arm on a. common axis, which axis is directly adjacent to the side wall' of the switch housing.

The switch arm and actuator are connected by a substantially C-shaped toggle spring 62, one end of which is hooked into an aperture 63 on the switch arm as far as possible from the axis of swinging motion of the arm, and the other end of which is hooked into an aperture 64 in an ear 65 bent up from a portion of the actuator so as to lie flatwise over the arm at the side of the switch arm remote from the insulating base l5. Hence pivotal motion of the actuator in one direction from one of its limits to the other snaps the switch arm in the opposite direction about the pivot axis of the actuator, and vice versa, to eiect closing and opening of the switch.

- One of the main advantages of this invention is obtained by reason of the fact the switch arm 5 axis and the point of connection between the arm and the toggle spring so that a substantial increase in leverage is achieved through the toggle spring with very little compression thereof dur ing the actuating stroke. Y

Besides eliminating the need for a separate pivot post for the switch arm, the provision of a common pivot axis for the arm and actuator enables the switch contacts to be located as far as possible from the pivot axis of the switch arm to achieve an exceptionally fast make and break and closer equalization of the speed and amount of break at the stationary contacts. Hence, it is possible for the stationary contacts to receive substantially equal shares of the arcing which results at the time of separation of the bridging contacter therefrom, and the life of the contacts is greatly prolonged.

Pivotal or rocking motion is imparted. to the actuator by means of the driver i0 fixed on the inner end 0f the common operating shaft 9 0i' the instrument. The driver comprises a relatively iiat stamping substantially normal to the axis of the operating shaft 9 and consequently parallel to the end wall 8 of the rheostat housing. It has diametrically opposite arms 61 and 68, and the limits of rotary motion of' the operating shaft are defined by the engagement of an upstanding ear 68 on the outer end of the arm 61 with one side or the other of an indentation in the side and end wall of the rheostat housing substantially opposite the triangular opening therein.

A pair of driving lugs, 12 and 13, bent up toward the end wall 8 of the volume control housing from the opposite arm 68 of the driver are adapted for transient engagement with the bladelike end 49 of the actuator during oscillatory motion of the operating shaft toward either of its limits of motion to impart rocking motion to the actuator. The

lugs

12 and 23 are spaced difierent radial distances from the axis of the operating shaft, the lug 13 being farthest therefrom, and it will also be noted that the lugs are spaced circuferentially from one another a slight dis- 50 tance.

In the off position of the switch at which the blade-like end 49 of the actuator projects toward the axis of the switch housing, the

lugs

12 and 13 lie at opposite sides of the blade-like body of the actuator, it being understood that the driver is also in one of its limits of rotation corresponding to the off position of the switch. This condition is best illustrated in Figure 5a where it will be noted that the driving lug 12 is at the righthand side of the actuator, and with respect to the pivot axis thereof, is located a distance inwardly of the free extremity of the actuator blade; while the lug 13 is at the left-hand side of the actuator and is located slightly farther inwardly from the free extremity of the actuator blade.

Upon rotation of the operating shaft in a, clockwise direction as seen in Figure 5a, the lug 12 is brought into engagementwith the right-hand face of the actuator at a point thereon spaced a 70 distance inwardly, toward the actuator axis, from the free edge of the actuator blade toA swing the actuator from its switch oi position seen in Figures 2 and 5a toward its switch on position seen in Figures 3 and 5. As the blade-like body of the actuator passes dead center of the toggle amano connection between the actuator and switch arm, the toggle spring snaps the actuator and switch arm to their switch on" positions seen in Figure 3.

The force of the toggle spring is applied to the actuator at a point intermediate the ends thereof. Hence, in the switch on position', the toggle spring presses the opposite ends of the actuator against the abutments l and 52 on the end walls of the housings, and since these abutments are arranged to lie in a common plane parallel to the pivot axis of the actuator it will be apparent that they have a straightening effect upon the actuator to hold it against fiatwise tilting at its connection to the side wall of the switch housing.

It is highly advantageous to havethe driver lugs initially engage the actuator blade at a point spaced a distance inwardly of its free end. The importance of establishing such engagement between the lugs and the actuator blade will be readily appreciated when it is realized that, in turning the switch on, the lug 'i2 tends to ride off of the free end of the actuator. Consequently, if there is any Variation in assembly of the switch parts such as tend to alter the snap angle of the actuator blade at dead center of the toggle connection between the actuator and switch arm, there is ordinarily some danger of the driving lug riding off of the free end of the actuator blade before it has carried the blade to the snap position (past dead center of the toggle).

Hence, the initial engagement of the lug 12 with the actuator blade inwardly of its free end assures that the blade will be carried to and past snap position by the lug despite unavoidable variation in assembly by the switch parts, and in fact establishes a margin of safety producing a substantial degree of follow-through of the driving lug 'l2 during actuation of the switch to on position. The substantial amount of follow-through engagement normally provided between the lug 12 and the actuator blade is shown in Figure 5b.

With the conventional one-driver lug operation wherein the single lug engaged in a notch in the actuator, the amount of follow-through engagement is extremely limited and confined to areas of the abutments defined by the actuator notch near the outer edges of the abutments so that there was little margin of safety in the event of variation in the assembly of the switch parts which altered the "snap angle of the actuator. This latter condition of little or nor followthrough engagement is illustrated in Figures 6a, 6b, and 6c, and shows that the danger of premature separation of the driving lug from the actuator abutments is present when turning the switch off as well as on.

During counterclockwise rotation of the operating shaft to impart rocking motion to the actuator toward the switch oi position seen in Figure 5a, the driving lugs are substantially parallel to the sides of the blade-like end portion 49 on the actuator as they approach the same. In this case, however, the lug 12 clears the actuator f while the lug 13 engages the blade at a point spaced well inwardly from its free end, as described previously, and rides inwardly toward the actuator pivot axis as it carries the actuator to snap position so that there is no danger of premature disengagement between the actuator blade and the lug 13.

The result f the provision of a blade-type actuator operated by a pair of driving lugs in the manner described is positive and smoother switch actuation, and, of course, extreme simplicity of construction of the actuator itself.

From the foregoing description taken in connection with the accompanying drawings, it will be readily apparent to those skilled in the art that this invention greatly simplifies the construction of snap switches of the character described by virtue of the provision of a common pivot or fulcrum for the switch arm and its actuator; and that the operation of the switch mechanism is exceptionally smooth with more nearly uniform speed of contact separation achieved as the result of fulcruming the switch arm from the actuator on an axis directly adjacent to the side wall of the switch housing.

What we claim as our invention is:

1. In an electrical control device of the character described: a substantially cup-shaped housing having side and end walls; switch mechanism in the housing including a switch arm; an actuator for said switch arm; a connection between the actuator and the housing side wall whereby the actuator is supported from the side wall for rocking motion about an axis parallel to the axis of the housing and directly adjacent to the housing side wall; an edge portion on said actuator directly adjacent to and facing the housing side wall and upon which the switch arm is fulcrumed for swinging motion about an axis parallel to the housing axis and directly adjacent to the housing side wall; and a toggle connection between the switch arm and the actuator by which rocking motion of the actuator effects swinging motion of the arm about said fulcrum with a snap action.

2. In an electrical control device of the character described: a housing having a side and an end wall; an actuator supported from the housing side wall for rocking motion about an axis substantially perpendicular to the end wall of the housing; switch mechanism in the housing including a switch arm; an edge portion on the actuator directly adjacent to and facing the housing side Wall for fulcruming the switch arm for swinging motion about an axis parallel to the pivot axis of the actuator and directly adjacent to the housing side wall; a toggle spring connected between the switch arm and the actuator so that back and forth rocking motion of the actuator eiects swinging of the switch arm in opposite directions with a snap action; and stops on said end wall of the housing engageable by the actuator to dene the limits of rocking motion of the actuator.

3. In an electrical control device of the character described: a substantially cup-shaped housing having a side wall a portion of which is indented inwardly toward the interior of the housing and has spaced cutout portions at either side of a circumferential slit in said indentation; switch mechanism in the housing including a switch arm having a part thereon received in the slit in said indentation; an actuator for said switch arm received in an opening in the arm 9 a toggle spring connected between the switch arm and the actuator and by which rocking motion of the actuator effects swinging motion of the arm about said fulcrum deilning edge of the actuator with a snap action.

4. A control instrumentality oi the character described comprising: a housing including a side wall and spaced apart substantially parallel end walls; switch mechanism in the housing including a movable switch arm; an actuator in the housing supported from the housing side wall for rocking motion about an axis perpendicular to said end walls, said actuator having opposite end portions adjacent to said end walls of the housing; a toggle spring connected between the switch arm and the actuator at a point intermediate said end portions thereof, and by which back and forth rocking motion of the actuator effects snap actuation of the switch arm in opposite directions; and two sets of abutments on said .end walls engageable by said end portions of the actuator for defining the limits of rocking motion thereof and for straightening the actuator on its pivot axis at each of its limits.

5. A control instrumentality of the character described comprising: a housing including a side wall and spaced apart substantially parallel end walls; switch mechanism in the housing including a movable switch arm; an actuator for said switch arm stamped from sheet metal and having a substantially flat body; a connection between the actuator and the housing side wall by which the actuator is supported from said side wall for fiat-wise swinging motion about an axis perpendicular to said end walls, and directly adjacent to the side wall of thehousing, opposite end portions of the actuator projecting into aligned substantially triangular apertures in the housing end walls for engagement with the side edges of said apertures so that said edges of the l limits of rocking motionof the actuator, said stops being so -related to the pivot axis of the apertures denne the limits of rocking motion of the actuator; a toggle spring connected between the switch arm and actuator and by which back and forth rocking motion of the actuator effects snap actuation of the switch arm in opposite directions; and a driver having a pair of driving lugs separately engageable with one of said end portions of the actuator for imparting rocking motion thereto.

6. A control instrumentality of the character described comprising; a housing having a side wall and spaced apart substantially parallel end walls, said side wall having spaced openings therein; switch mechanism in the housing including a disc-like switch arm disposed fiatwise between said end walls of the housing; an actuator for said switch arm having a fulcrum dening edge thereon, normal to the housing end walls engaging the housing side wall and cooperating with spaced locating lugs projecting from said edge and engaged in said openings in the side wall to mount the actuator for rocking motion on said fulcrum defining edge thereof, said actuator extending between said end walls and through a hole in the switch arm with said edge on the actuator engaging an edge of the hole in the arm to fulcrum the arm from the actuator for swinging movement about the actuator pivot axis; a. toggle spring connected between the switch arm and the'actuator s'o that back and forth rocking motion of the actuator eiects swinging of the switch arm in opposite directions with a snap action; and stops on each of said end walls against which the actuator is pressed by the toggle spring for defining the actuator as to effect straightening of the actuator on its axis as it is pressed against said stops by the toggle spring.

7. An electrical instrumentality of the type having a cup-shaped housing containing switch mechanism the switch arm of which is operated through a toggle connection between it and an actuator pivotally supported from the side wall of the housing for rocking motion about an airisA perpendicular to the end wall of the housing and directly adjacent to said side wall characterized by the fact that the switch arm is fulcrumed on an edge portion of the actuator for swinging motion about the pivot axis of the actuator.

8. An electrical instrumentality of the type having a cup-shaped housing containing switch mechanism the switch arm of which is operated through a toggle conne ation between it and a switch actuator, characterized by the provision of a single edge portion on the actuator engaged with the side wall of the housing and by the switch arm for fulcruming the actuator and the switch arm for rocking motion about a single axis directly adjacent to said side wall of the housing and parallel to the axis of the housing.

9. In an electrical control instrumentality of the character described: a substantially cupshaped housing; switch mechanism in the housing including a switch arm; a switch actuator supported from the side wall of the housing for rocking motion about an axis directly adjacent thereto and normal to the housing end wall; a fulcrum forming edge portion on the actuator adjacent to the housing side wall and upon which the arm is supported for swinging motion between operative and inoperative positions subl stantially on the pivot axis of the actuator; a toggle spring connected between the switch arm and the actuator whereby back and forth rocking motion of the actuator eiects snap actuation of the switch arm between its operative and inoperative positions; a blade-like part on the actuator projecting out from the open end of the housing; a cover`secured to the housing in a position clos# ing the open end thereof, said cover having an opening through which said blade-like part on the actuator projects; and a driver having a pair of spaced apart driving lugs thereon separately transiently engageable with said blade-like part on the actuator for imparting rocking motion thereto.

10. In an electrical control instrumentality of the character described: a cup-shaped housing; an actuator supported from the side wall of the housing for rocking motion about an axis perpendicular to the end wall of the housing and directly adjacent to said side wall; switch mechanism in the housing operated by said actuator and including a switch arm fulcrumed on an edge portion of the actuator for swinging motion between operative and inoperative 'positions about the pivot axis of -the actuator; a toggle spring connected between the actuator and switch arm whereby back and forth rocking motion of the actuator effects snap actuation of the switch arm between said positions thereof; a cover secured to the housing and closing the open end thereof; a blade-like part on the actuator projecting from the housing through a hole in said cover; and an oscillatable driver having a pair of driving lugs thereon each adapted to engage one at face of said blade-like part a distance inwardly of the edge of said part remote from the pivot axis of genome 11 i the actuator during oscillatory motion of the driver to impart rocking motion'to the actuator.

11. In an electrical control instrumentality of the type having a cup-shaped housing containing switch mechanism including a switch arm shifted between switch-on and switch-oi! positions through a toggle connection `between it and an actuator supported from the side wall of the housing for rocking motion between dened limits about an axis perpendicular to the end wall of the housing; a single blade-like part on said actuator substantially perpendicular to the end wall of the housing and movable with the actuator from a position extending edgewise toward the housing axis at one limit of the actuator to a position in which one ilat face of said blade-like part substantially faces the housing axis at the other limit of the actuator; a driver for said actuator; means fixed with respect to said housing mounting the driver for oscillatory motion about the axis of the housing; and a pair of driving lugs on said driver located diierent posed with respect tosaid blade-like body; and a pivotal connection between said tail portion cf the actuator and the housing side wall by which the actuator is supported from the sidewall for Y axis radial distances .from the housing axis and each rocking motion about an axis normal to the end wall of the housing and with said blade-like body of the actuator eccentric to the actuator pivot 13. The electrical control instrumentality set forth in claim 11 wherein said driving lugs are substantially flat and are disposed at opposite sides of said single blade-like part on the actuator and edgewise to the adjacent faces thereof when the blade-like part is in said position extending toward the housing axis.

ADRIAN J. VAKSVIK. MERVIN B. ARISMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 21,211 Schellenger Sept. 19, 1939 2,067,557 Allison Jan. 12, 1937 2,146,628 Jackson Feb. 7, 1939 2,156,989 Johnson May 2, 1939 2,177,288 Schellenger Oct. 24, 1939 2,180,921 Churchill Nov. 21,1939 2,236,344 Mener Mar. 25, 1941 2,313,291 Bchellenger Mar. 9, 1943