Abstract: An axially operated switch for electrical circuits a switch rod having an axis and arranged to move in an axial direction, the switch rod having one end to be actuated and an opposite end arranged to actuate electrical contacts upon its movement in an axial direction, a key arranged to act on the one end of the rod and to move the rod in the axial direction, and a direction changing device cooperating with the key so that the key being pressed by a user is displaced in direction of y axes substantially perpendicular to the axis of the rod and also in direction of x axes substantially parallel to the axis of the rod and as a result acts on the one end of the rod so as to move the rod in the axial direction.

Abstract: Method and apparatus for storing and moving an x-ray detector assembly in and out of the field of radiation produced by a radiation therapy simulator source while remaining affixed to the gantry of the simulator and retaining the functional attributes of a standard radiation therapy simulator cassette holder. When mounted to the simulator, the apparatus of the present invention has the ability to position an x-ray cassette in a fixed position relative to the radiation source, allow for the use of an image intensifier tube by being effectively radiolucent over the tube, and incorporating a mechanism which is capable of absorbing a degree of movement independent of the gantry while simultaneously activating a switch mechanism which can be used to stop gantry rotation, thereby preventing damage to the device or that which it contacts.

Abstract: A switch extender for electrical switches having a front plate slidably coupled to a back plate which in turn is attached to a wall-mounted switch plate. The back plate includes a knock-out portion which allows use of the invention with both toggle switches and rocker switches. A pair of cylindrical bars are positioned within an opening in the front plate. A toggle switch fits within a slot between the bars, and the corners of a rocker switch fit within slots outside of the bars on the front plate. Sliding the front plate relative to the back plate actuates the switch.

Abstract: The present invention is directed to an actuating device for a power switch of a monitor, in which an actuator member for activating the power switch is slidably coupled either internally or externally, to a supporting plate of a frame which holds a printed circuit board. The coupling of the actuating device to the supporting plate of the frame holds the actuating device in alignment independent of the printed circuit board.

Abstract: A mechanism (10) for actuating an electric circuit is shown including a switch box (11) fastened to a housing (26) to which a cover (60) is movably mounted. The threaded stems (54) of four de-energizing momentary switches (52) extend through and are held to the front wall (32) of the housing (26). The cover (60) includes a sleeve extending rearwardly of its broad surface front wall (62) and slideably received in a tubular extension (46) of the housing (26). A flange (72) on the sleeve abuts with ledges (50) formed in the tubular extension (46) to prevent movement therebeyond. The cover (60) can be pushed against the bias of coil springs (74) arranged concentrically around the stems (54) such that any point of the broad surface front wall (62) can be moved in an actuation direction to slide the actuating pins (58) slideable in the stems (54) of one or more of the de-energizing switches (52) to de-energize the electric circuit.

Abstract: A remote controlled circuit breaker including a mechanism linked to a handle by a drive lever equipped with a roller cooperating with a recharging cam of an energy storage system including a spring. A bearing surface is arranged to block the roller in the charged position, without requiring the presence of a special latching stage, since the line of action of the reaction R of the roller passes via the transmission shaft of the cam. A step-by-step motor of the vibrating type drives the transmission shaft in rotation, and enables almost instantaneous stopping of the cam when the roller is in contact with the bearing surface.

Abstract: A horn button overlay provides an enlarged striking or actuating surface for a horn button on an airbag equipped steering wheel without interfering with airbag deployment. In an illustrative embodiment, a horn button overlay comprises a first substantially planar surface, a second surface opposite the first surface, the second surface having a protruding portion with an adhesive disposed thereon. The horn button overlay can be transparent, brightly colored, or textured.

Abstract: An extension for facilitating operation of a light switch from a distance below the switch. The inventive device includes an elongated member having a handle at a first end thereof and an engaging assembly at a second thereof. The engaging assembly can be releasably coupled to the toggle member of the switch to facilitate operation of the switch by a child positioned below the switch.

Abstract: A rotary control device for a circuit breaker having a front plate having an opening through which a crank pin extends, the crank pin being pivotal between first and second positions, the rotary control device including a housing and a rotary handle mounted on the housing, the rotary handle being rotatable between first and second positions corresponding to the first and second positions of the crank pin. A coupling mechanism is provided for mechanically coupling the rotary handle to the crank pin when the housing is mounted on the front plate of the circuit breaker, the connecting device preventing mounting of the rotary control device on the circuit breaker when the rotary handle and the crank pin are not in the same position, that is, are not both in the first position or both in the second position. The first and second positions may correspond to open and closed positions of the circuit breaker, for example.

Abstract: An operating mechanism for an enclosure-mounted circuit breaker includes a slider for engaging the circuit breaker handle; a shaft-driven pivot for moving the slider between the handle on, off and reset positions; a holder for holding the slider in its reset position; a base plate for supporting the pivot and the slider; and a door-mounted rotary handle for rotating the shaft and operating the pivot. The rotary handle may engage the shaft in the on and off positions, and may be detached from the shaft in the reset position. The pivot may include a first pivot arm having a first cam surface for holding the slider in its reset position. A second cam surface on a second pivot arm may engage a first slider surface from off to on; a second slider surface from on to off, from off toward reset, and to resist reset to off; and an oblique slider surface when adjacent reset. The second cam surface may disengage the oblique surface at reset.

Abstract: A powered mechanism displaces the toggle, handle or similar operator of a switch such as a circuit breaker, motor contactor or transfer switch. A linear induction motor drives a motor shaft between extended and retracted positions. A pair of S-shaped cam members pivot at one end on an axis, and a sliding pin carried on the end of the motor shaft rides along slots in the cam members. A couple engages over the switch operator and is pivotally attached to links that in turn are pivotally attached to the cam members, The links attach to the cam members at a point closer to the pivot axis of the cam member than the sliding pin in the slots, thus obtaining leverage. The slots have an inclined or curved section joined to a straight section. The straight section provides an idling action in that no force is applied to the operator via the couple as the sliding pin passes through the straight section, allowing the motor to accelerate unopposed.

Abstract: A switch device of reduced thickness is provided for use in motor vehicles or the like in which a switching element in a casing is operated with an operating knob. Such a switch device can be assembled with ease and is stable in the operation of the switching element. Such a switch device may be installed both on the right side and on the left side, while employing one and the same casing, and is therefore low in manufacturing cost. In the switch device, a switching element is provided inside a casing, and is operated with an operating knob provided on the outer surface of the casing. The switching element is secured to the back of the circuit board by soldering its fixing terminals on the side of the surface of the circuit board, and a driven part of the switching element, which is operated with the operating knob, is stuck out on the side of the surface of the circuit board through an opening formed in the latter.

Abstract: Safety apparatus for disconnecting overhead electrical switches for maintenance, comprising an insulated rod having an upper disconnect hook to engage a handle of a switch box and move it from an on position to an off position in which power is disconnected, an arm attached to the rod and cooperating with the hook to secure the switch handle in the off position, and a locking device connected to the arm and to the rod to prevent inadvertent movement of the switch handle to the on position.

Abstract: A switch actuating assembly having an attachable trigger accommodates the implementation of numerous trigger designs and configurations with a single switch assembly. The slide actuator has a head and neck portion which is adapted for locking and mating receipt by a pair of deflectable legs in U-shaped configuration positioned in spaced apart relationship from a pair of flanges. The head of the actuator is engaged in the space between the flanges and the legs, while lips on both the legs and the neck portion provide further interlocking engagement. The positioning of the head within a space between the flange and legs prevents axial movement of the actuator with respect to the trigger assembly, while the interengagement of the lips prevents any vertical movement between the two.

Abstract: The present invention is for use with high-tension electrical switchgear enclosed within a cabinet. The output shaft of a spring operating mechanism mounted on the exterior of the main safety door extends through the door and is connected to a bell crank. As the shaft rotates the bell crank, it imparts force to a first substantially vertical push rod which in turn imparts force to a second bell crank. An arm of the second bell crank imparts force to a second push rod which is connected to a lever arm that is connected to the operating shaft of the electrical switch, thereby opening or closing the switch. The first push rod has ball joints at both ends and a free twisting joint along the rod, thereby allowing opening of the door without disconnecting the operating mechanism. A push rod connected to the first bell crank engages a lip affixed to the cabinet wall to prevent opening of the door when the switch is closed.

Abstract: A battery-operated automatic electrical switch control device to be mounted on an existing wall switch. A back frame is mounted behind the existing switch plate and a casing containing the electric circuitry and moving components of the device clips around the switch plate and onto the frame. Inside the casing is a printed circuit board wired to a DC motor that drives a cam. The printed circuit board is connected to a sensor or timing component, also in the casing, which signals the turning on or off of the switch. Such a signal, which may originate from a remote control unit or from changes in the local environment, is passed on to the motor, which drives the cam to rotate. The cam follower has on its tip a claw which grasps the actuating knob of the wall switch. The linear movement of the cam follower in response to the turning cam causes the knob to be pushed up or down, turning the switch on or off accordingly.

Abstract: The present invention relates to a wall switch plate adaptor for use by children or the disabled to turn off and on wall switches which are located above the reach of the potential user. The wall switch plate adaptor comprises a switch plate cover that includes raised areas to the left and right of the middle opening. These raised areas of the switch plate cover are used as guides for the flared edges wing-like projections at the end of an elongated member which projects a distance below the bottom edge of the switch plate cover. The wing-like projections fit in between the raised areas to the left and right of the opening in the switch plate cover. The top of the elongated member has a box channel shaped cross-section with flared edges forming wing-like projection has an opening in the center so the toggle switch can be put through when assembled.

Abstract: A device for actuating conventional toggle-type and rocker-type electrical wall switches such as light switches, particularly adapted for facilitating switch operation by children and handicapped persons who cannot reach the normal elevation at which such switches are installed, utilizes an elongated operating arm with a portion at one end for operating engagement with the switch, e.g.

Abstract: A hand-held orbital polisher includes a housing, an electric motor and hand-operated motor control device mounted in the housing, and a pair of handles closely coupled to a housing to position an operator's thumbs adjacent the control device. The control device includes an electrical switch having a slidable actuator and a pair of thumb-actuated levers to selectively move the actuator into either of two on positions or into an off position. The levers are pivotably mounted to the housing, have a collar drivingly connected to the actuator, and a thumb pad at one end. The pivots can be defined at the other end of the levers and the collar at the center, or at the center of the lever and the collar at the other end of the lever. One or both of the user's thumbs can be used to apply a force with a force on one lever being transmitted simultaneously to the actuator and thereby against the other beam whereby to force the two levers in one or the other position, the operator's hand never having to leave the handles.

Abstract: A one piece mount for mounting switches is disclosed. The mount includes a face plate provided with an aperture in which a push button switch or a key operated switch may be located. A support bracket is located on the rear face of the face plate being formed as one piece with the plate and is provided with holes in which push button switches may be mounted. In one version of the mount a raised portion is provided on the rear face being formed as one piece with the face plate and the support bracket wherein the aperture extends through the raised portion. In use, this version of the mount is provided with a key operated lock cylinder mounted in the aperture and having a cam arm pivotally mounted on the rear face of the lock cylinder.

Abstract: A known switch is mounted on a base of a switch actuator assembly. When the switch is to be actuated, an input shaft and switch actuator member are rotated together relative to the base. A helical return spring urges the input shaft back toward the initial position. When the input shaft and switch actuator member have been rotated together to an actuated position, the switch is actuated and the switch actuator member engages a stop surface. During continued rotation of the input shaft from the actuated position to an overtravel position, a pin connected with the input shaft moves away from one end of a slot in the switch actuator member. A helical overtravel spring is deflected along with the return spring. Deflection of the overtravel spring urges the switch actuator member and input shaft back toward their initial position relative to each other.

Abstract: An foot pedal switch assembly including a panel for mounting a foot pedal and a switching mechanism, wherein the panel includes a debris fence surrounding the switching mechanism and the pedal has a cap structure molded in the bottom to telescopically engage around the debris fence forming a substantially continuous barrier to the entry of dust and debris into the switching mechanism.

Abstract: The present invention is a knob which attaches to the switch post of a push/pull switch. The knob selectively disengages from the switch post as the knob is inadvertently impacted, thereby isolating the push/pull switch from the impacting force. The knob moves independently of the switch post and contacts the housing supporting the switch. Consequently, the force of impact is directed to the housing through the body of the knob and very little force is directed to the switch.

Abstract: A remotely positioned rotary operator handle for cooperating with a circuit breaker with a linearly movable handle. A housing is mounted over the circuit breaker handle. Within the housing a slide carrying a rack engages the circuit breaker handle which further engages a pinion gear sector mounted on a rotatable shaft. The rotatable shaft extends from the housing and has positioned thereon a motion translating device which translates between rotational motion and linear motion. The rotary handle extends from a housing which is flange mounted on a cabinet in which the circuit breaker is disposed. A corresponding motion translating device is attached to the flange mounted rotary handle which is in turn connected to the motion translating device attached to the rotatable shaft. The connection between the motion translators comprises a linearly moving link. The rotary handle has an extendable hasp which comprises part of the connection between the rotatory handle and the motion translating device.

Abstract: An actuator means for an electrical switch concealed in a housing and operated by a handle externally mounted to the cover thereof, whereby, upon closing the cover, the actuator automatically moves in a rectilinear direction to locate the toggle operating lever of the switch and rotatably moves the externally viewed handle to preposition it to indicate the energization state of the switch. Alternatively, the actuator permits operation of the switch by rotating the externally accessible handle. This invention is especially suited to circuit breaker switches contained in explosion-proof or hazardous location-rated enclosures.

Abstract: An add-on vehicle horn button actuator is mounted on an existing steering wheel over a portion of the periphery of its wheel portion with a generally triangularly shaped surface extending inwardly in overlying relation to the horn button of the steering wheel. A screw depending downwardly from the triangularly shaped surface is adjustable within an elongated slot on the triangularly shaped surface to accommodate to horn buttons having differing locations. When the triangularly shaped surface of the actuator is slapped or otherwise struck by the user, the screw engages the horn button and depresses it thereby actuating the vehicle horn.

Abstract: An alarm housing mounted to an exterior side wall surface of an associated rural or house mounted mailbox includes a switch arm having a roller cylinder mounted at a distal end thereof in engagement with the door portion of a rural mailbox, whereupon pivoting of the rural mailbox door to an opened orientation displaces the roller effecting closure of a switch within the alarm housing to activate visual and audible alarm structure.

Abstract: A protective cover for a hand operated computer control, sometimes referred to as a "mouse" where the protective cover has a cavity in which the "mouse" is held and shielded from dust and dirt. The cover has pivotal levers with downwardly projecting adjustable projections that contact buttons on the "mouse" to signal commands to a computer.

Abstract: A rotary handle operator for a circuit breaker with a linearly movable handle has a housing which is mounted over the circuit breaker handle. A slide carrying a rack engages the circuit breaker handle and is slidable within a chamber in the housing. The rack engages a pinion gear sector mounted on a rotatable shaft which extends through a cover on the housing. A rotating handle mounted on the shaft is rotated to linearly operate the circuit breaker handle or is positioned thereby when the circuit breaker trips. The handle may be locked in the off position by inserting the shackle of a lock through an aperture in a lever arm on the rotating handle to urge a pin on a spring biased locking piece within the handle lever into an aperture in the housing cover, or the shackles of several locks may engage a slot in a shroud surrounding the rotating handle to interfere with rotation of the handle out of the off position.

Abstract: An electric operator having a reciprocally mounted actuator is adapted to be mechanically coupled to an operating handle from a molded case circuit breaker or a molded case switch for moving the operating handle between an open position or, alternatively, to a closed position. The electric operator includes an electric motor for driving the actuator and allowing the circuit breaker to be controlled from a remote location and a mechanical crank assembly which alternatively allows for manual operation of the actuator in the event of a loss of electric power to the electric motor.

Abstract: The invention relates to a switch device which is suitable for use, for example, in a telephone to detect the presence of the handset (11) in the cradle (9). The switch device comprises a frame (3), a switch (4) movable in relation to the frame, and a separate plunger (2) acting on the switch, the plunger comprising a press knob (5) and a spring part (6). The plunger operates by bringing the switch (4) into the connecting position and by releasing it, after the pressure has ceased, to return to the initial position. It is essential in the invention that the spring part (6) of the plunger comprises a part which is against the switch (4) and is wider than the switch, is of a resilient material and hollow. This part (6) may be made up, for example, of a transverse sleeve or ring as an extension of the press knob (5).

Abstract: The handle of a circuit breaker is controlled manually by sliding a linkage member right, or left, upon a flat surface of the housing of the circuit breaker. The linkage member is at one end pivotally attached through a knurled pin to the handle and, at the other end, a handhold portion is provided with a recess admitting a finger, or thumb, to push or pull the linkage member and actuate the circuit breaker through its handle.

Abstract: A mechanism is provided for throwing several toggle switches together, especially toggle contact breakers, which are enclosed in an explosion proof container. A link between the toggles distributes manual toggling force over all of them from a single manual throw switch. The single manual throw switch may be located outside the explosion proof container and be connected to the link to the toggles through a wall, e.g., a moveable wall such as a door. In one practical embodiment, the link is an elongate tie bar for the toggles, and the manual throw switch is connected to the spaced apart forks which are geared together.

Abstract: A signal activating device for activating a nurse call system as commonly used in hospitals and nursing homes to summon the attending personnel for assistance, wherein an elongate bar having circuitry electrically interconnected to the call system is supported on the railing structure of a bed or chair so as to extend transversely thereacross in a readily accessible location over a midportion of the body of a person in the bed or chair. A hollow tube is fitted over the bar in engaging, supported relation on a number of electric switches mounted at spaced intervals along the bar's length such that pressure applied by the person to any location along the upper portion of the tube serves to operate at least one electric switch on the bar, thereby activating the nurse call system.

Abstract: A manual operator for opening and closing an electrical switch, including a switch-driving element, a relatively rotatable handle element, and a resilient transmission, e.g., a leaf spring or springs, extending between the two elements. An abutment is fixed to one of the elements and a follower is fixed to the other, the abutment engaging the follower only after the resilient transmission has been tensioned by rotation of the handle element. When the driving element engages a portion of the switch mechanism, initial rotation of the handle causes the resilient transmission to be tensioned and the abutment to engage the follower. Further rotation of the handle is transmitted through the abutment and follower to the driving element to initiate the movement of the switch mechanism, following which the tensioned resilient transmission instantly shifts the switch mechanism through the remainder of its movement to snap the switch open or closed.

Abstract: A control mechanism operable for selectively moving an on-off switch into on and off positions includes an on-off switch having opposed, first and second ends simultaneously movable in opposite directions, an actuator disposed adjacent the on-off switch selectively movable for engaging the first end of the on-off switch and urging it in a first direction to an on position accompanied by movement of the second end of the on-off switch in the opposite direction, and a biasing device disposed adjacent the on-off switch and externally thereof for engaging the second end of the on-off switch and normally maintaining it in the off position. The biasing device yieldably resists movement of the actuator when it engages the first end of the on-off switch and moves it in the first direction toward the on position.

Abstract: An integrally formed joystick for a computer keyboard having a central hollow housing loosely fitted over a center key and capping the same, the stick having two or more spaced arms extending externally from the central housing and adapted to make contact by depression of an arm or arms with a key or keys adjacent to the center keys to effect a desired graphic display in a direction selected by the operator.

Abstract: A switch apparatus for an electrical machine comprises a keyway and a removable key. A spring-loaded protrusion on the key prevents direct insertion of the key into an "ON" position, and communicates with a guideway for movement of the key between the "OFF" and "ON" positions. The key is directly removable from both the "ON" and "OFF" positions simply by pulling, to deactivate the machine in an emergency or accident. Unauthorized and accidental operation of the machine may be prevented by control of the key.

Abstract: A portable electric appliance including a fan device comprising a rotatable blade assembly and an electrical motor operatively coupled thereto; a standard having an upper end fixed to the fan device; a pedestal base; a coupling including an upper member joined to a lower end of the standard and a lower member pivotally coupled with the upper member and joined to the pedestal, the upper member being freely demountable from the lower member; a manually operable latch for preventing demounting of the upper member from the lower member; and a positioning mechanism for selectively fixing the relative angular positions of the upper and lower members.

Abstract: An improved safety interlock switch device incorporated onto a machine with internal moving components. The device is mounted adjacent a cover which shields the internal components of the machine when the cover is in a closed position. When the cover breaks contact with the switch, electrical circuit controlling the internal moving components is broken such that movement ceases in the interior of the machine. This type of system protects operators who can be injured by moving internal components while also preventing destruction of the internal components caused by contact with external elements while still in motion. The present invention lengthens the time delay between the break in contact of the cover and the deactivation of the electrical circuit controlling power to the internal movable components.

Abstract: An actuation device for a switch of a hand machine tool, particularly for a Totmann switch which provides for fatigue-free operation. The actuation device includes a front wall provided with a locking projection engageable in a recess formed in the wall of the switch housing. A restoring spring acts on an actuation member. Two spaced ribs with inclined surfaces are provided on the housing wall. The locking projection slides along the inclined surfaces of the spaced ribs. The locking projection may be broken away from the front wall of the actuation member whereby the end of the front wall would slide along the inclined surfaces of the ribs.

Abstract: A structure for facilitating the gripping and operating of a control lever of an electrical switch plate mounted into an electrical box embedded into a wall. The structure comprises a movable plate having a large central projection. The projection defines a trough in which the control lever engages, and two large abutting surfaces opposite the trough and orthogonal to the wall, the plate being slidable within a plane parallel to the wall. A cover is fixedly secured to the electrical box by its square central section the plane of which is interiorly offset with respect to the main body of the cover. The central section is upwardly and downwardly open to enable sliding action of the movable plate parallel to the wall, within the plane of the cavity. Thus, the movable plate hides the control lever as well as the screws that secure the cover to the electrical box, and is retained by the guide walls of the cover.

Abstract: A switch device is provided in which the pressing force imparted to a handling lever is transmitted through a link member to a push switch provided with a push-lock mechanism. Such a device can be used where there is limited mounting space, such as in a vehicle. The invention includes a push switch, a handling lever, a link member, an elongated hole, and a connecting pin moveable within the elongated hole, and is characterized by a restraining wall for synchronizing the position of the handling lever and the state of the slider by restraining the movement of the connecting pin. According to the invention, the state of the push switch which is provided with a push-lock mechanism and the position of the lever are synchronized in that the handling lever does not return to an unpushed position when the slider is in the locked position. This is achieved by the configuration of the connecting pin, the elongated hole and the restraining wall.

Abstract: A circuit breaker auxiliary switch structure characterized by a contact arm carrying a first contact movable between open and closed positions with a second contact. An auxiliary switch is disposed in the path of movement of the contact arm and operable to open or close an auxiliary circuit associated with a circuit breaker.

Abstract: New cover assemblies for electrical fixtures in buildings allow conventional outlets and (toggle) light switches to be cheaply converted into a variety of different color designs and/or colors without changing the electrical infrastructure of the fixture. The cover assemblies comprise a cover plate with an appropriate number of orifices, each orifice being covered by a slider so that the whole cover assembly shields the conventional parts of the fixtures normally visible in building interiors.

Abstract: An improvement for an electrically powered appliance having a pushbutton "ON-OFF" switch. A cam mechanism is manually operable by a user of the appliance to move the switch from its biased "OFF" position to its unbiased "ON" position. The mechanism holds the switch in its "ON" position when manual force is removed.

Abstract: A rotary switch actuating mechanism for at least two control elements is provided, including at least one axial cam, parallel to the axis of rotation, which, in a given position of the rotary switch actuating mechanism, comes into direct engagement with one of the control elements through a transmission lever actuated by the cam in another position of the rotary switch actuating mechanism for acting on another control element.

Abstract: An attachment for use in conjunction with radio control transmitters, especially for use with model cars, which has a steering wheel and a fork-shaped lever extending therefrom. The lever is adapted to fit over the directional control stick of the transmitter, whereby the rotary motion created by turning the steering wheel translates into the rectilinear motion which actuates the control stick. Realism and enhanced operator control are achieved.

Abstract: A control switch having an air gap safety lever, a novel slide arrangement, and an illuminated on-off control switch. The air gap safety lever is mounted on the control switch in such a manner that no power may flow through the circuits until the unit has been installed and the front cover plate mounted. The slide arrangement employs a thin clip which provides an aesthetically appealing slide control, the clip having special dimples which allow nearly frictionless movement. The illuminated on-off control switch utilizes a light piping which conveys light from an LED to the on-off button, the light piping doubling as a mechanical link between the on-off button and a momentary contact switch mounted inside the control switch. Also, a novel frame is disclosed which secures all mechanical and electrical components of the switch together without the necessity of attaching the back box, which simplifies test and repair before shipment of the unit from the factory.

Abstract: An ON-OFF switch system for use between first and second conductors utilizing a first plate having first and second sides. The second side of the face plate includes an appendage which contacts an arm passing through a second plate. First and second plates slidingly engage one another to operate the arm. The arm is further connected to one of a pair of electrical contact members and is movable to operate contacts of the electrical members.