Abstract: An air switch assembly for an electric motor including a first snap action switch, a second snap action switch, and an actuator, is described. The first snap action switch is connected to the motor start winding and the second snap action switch is connected to the run winding. An actuator is positioned within the air switch assembly such that the air switch energizes the start winding, energizes the run winding, and de-energizes the start winding while maintaining the run winding energized when the actuator is actuated from an initial position to a final position.

Abstract: A drive unit structure for a keyboard assembly is provided, which comprises a driven member having a flat sliding surface and pivotable about a fulcrum thereof, and an actuator disposed for sliding contact with the flat sliding surface of the driven member to pivotally drive the driven member. The fulcrum of the driven member lies in a plane including the flat sliding surface of the driven member. As a result, the operations of the actuator and driven member can be stable, to thereby enhance the accuracy of transmission of the operation of the actuator to the driven member.

Abstract: A device for the actuation of at least one main switch, includes a lever having two main faces. In a working position of the lever, its main face is designed to actuate the main switch. In an idle position of the lever, its second main face is designed to actuate at least one ancillary switch capable of delivering an item of information on the idle position.

Abstract: A power window switch (1) for a motor vehicle comprises an actuation element (2) which is pivotally supported in a housing (6) and actuates switch contacts (57) by means of a corresponding sliding contact element (35), whereby said switch contacts are associated with connector contacts (53). In the pushing direction for the downward motion of the window, as well as in the pulling direction for the upward motion of the window, the actuation element (2) is respectively associated with a two-step pivoting motion (19), whereby the actuation element (2) acts on deflecting means (38, 78) to effect a linear back and forth motion of the sliding contact element (35), which successively actuates two switch contacts (57) of a switch matrix (49).

Abstract: A switch arrangement for switching a principal function and for switching at least one secondary function by which at least one secondary function is switchable whenever the principal function is turned on. The control or controls for switching the at least one secondary function is covered by a cover whenever the principal function is not activated, and the cover of the control or controls for the at least one secondary function is moved such that the control or controls become visible and accessible when the principal function is activated.

Abstract: An operation-staggered dual switch is provided having a casing, first and second switching mechanisms installed in the casing, the switching mechanisms being operatively connected such that operation of the first switching mechanism may follow operation of the second switching mechanism after a predetermined delay, wherein the operation-staggered dual switch includes delay means comprising a connection rod having indentations formed on one side, a train of toothed wheels having a leading toothed wheel and a trailing toothed wheel, the leading toothed wheel of the train of toothed wheels being engaged with selected indentations of the connection rod, and a rotary damper connected to the trailing toothed wheel of the train of toothed wheels, the connection rod being responsive to initiation of operation of the first switching mechanism for moving in a given direction.

Abstract: A switch apparatus has a fixed contact including a contact pattern formed on a printed substrate and a movable contact provided above and opposing the fixed contact. A switching operation is performed by engaging the movable contact with the fixed contact. The fixed contact pattern has a first pair of fixed contacts and a second pair of fixed contacts. The fixed contact patterns are separated by a predetermined distance from one another. The movable contact has a first movable contact and a second movable contact for engagement with the first and the second pairs of fixed contacts, respectively. One of the first pair of fixed contacts and one of the second pair of fixed contacts are formed in a unit to define a common pattern. Only the common pattern is disposed between the other of the first pair of fixed contacts and the other of the second pair of fixed contacts.

Abstract: The present invention provides a control switch device in which in an endoscope using an electrical control switch to carry out duct control, the conventional operation sense is left, and the flow rate in a duct can be regulated securely. An air/water feed switch portion disposed in an endoscope control section is configured so that a push button, first piston body, and second piston body are moved vertically by using a spring member in an upper and lower support cylinders. The second piston body is operated with an operation stroke which is longer than the stroke of the first piston body, and both of these piston bodies turn on/off an air feed switch and a water feed switch. Also, a suction switch using a pressure-sensitive sensor is used, and this suction switch is turned on/off by the piston body. At this time, in the suction switch, the operation pressure of the push button is detected, and suction of flow rate according to the operation pressure is effected.

Abstract: A pushbutton switch is disclosed which may be used, for example, in a camera. The switch has multiple positions which can be easily sensed by the operator as a point of resistance which is felt at each position. The switch may have an axially moveable spring biased switching rod at a defined electrical potential with an insulated region. A plurality of spring biased electrical contacts bear radially against the switching rod. A plurality of spring biased stops extending radially toward the path of axial movement of the switching rod correspond to the respective electrical contacts. Axial movement of the switching rod brings the contacts into successive contact with the conducting portion of the switching rod. The spring biased stops bear against the end of the switching rod at approximately the points of axial movement at which their corresponding contacts make contact with the conducting portion of the swiching rod, thereby generating a counterpressure which may be sensed by an operator of the switch.

Abstract: The invention includes a three-position switch having a keycap connected to a housing for pivotal movement, and slidable movement in a vertical direction. The keycap is connected to the housing so that the keycap may be rocked to a first position in which one end of the keycap is depressed closing a first circuit. The keycap may also be rocked to a second position in which a second end of the keycap is depressed closing a second circuit. The keycap may also be pushed downwardly so that both ends of the keycap are depressed closing the first and second circuits simultaneously.

Abstract: A dual action, convex disc push-button switch assembly providing tactile feedback to the operator. Each convex disc contact comprises four tabs, each tab of which is fitted and secured in the base of the switch assembly making the switch easy to assemble and operate reliably. The tabs of a first convex disc contact are positioned forty-five degrees relative to the tabs of a second convex disc contact. The switch is sealed thereby permitting various ways to secure the switch terminals to an electronic board.

Abstract: A variable rate pressure sensitive electrical device or switch. The switch includes a first substrate and a plurality of electrical circuit traces thereon. A first electrical trace is provided having a first set of raised contact features or bumps projecting from a prevalent planar portion of first electrical trace. At least a second electrical trace is provided having a second set of raised contact features or bumps extending above a planar portion of second electrical trace. The first and second electrical traces and associated raised contact features are constructed and arranged so that the height of the first set of raised contact features is greater than the height of the second set of raised contact features. A second substrate is provided with an electrically conductive element.

Abstract: A switching device includes the ability to perform a primary and secondary switching function through the use of a single switch handle. A primary switch contact is activated when the switch handle is moved in a desired direction. A secondary switch contact is activated when the switch handle is further moved in the same direction. The secondary switch contact includes a generally flexible conductive member supported adjacent a printed circuit board. An actuator portion of the switch handle moves into contact with the generally flexible conductive member causing a central portion of that member to flex toward and contact the printed circuit board. Such electrical contact results in a signal being generated that is indicative of a desire to accomplish the secondary switching function.

Abstract: The invention includes a mechanism for multi-dome dual detent switches having at least a first and second collapsible dome structure. An elongated action bar extends across and bridges the first and second collapsible dome members. The action bar has a top surface and a bottom surface. A notch is formed in the top surface closer to one of the dome structures. A keycap positioned for pivotal movement between a first and second forward position, and a first and second rear position. The keycap includes an engagement bar extending downwardly near one end and positioned to be received in the notch formed in the top surface of the action bar.

Abstract: A switch for making multiple contacts formed as an elastomeric molded body having a base with a ring of material molded therewith to the base, and attached to the base by a web. An interior cylindrical member is supported within the ring of material by another web. Electrically conductive media is formed on the ring and on the interior cylindrical member. The switch is mounted on a board having multiple stationary contacts that can be contacted by the conductive surfaces on the ring and the conductive surface on the interior cylindrical member.

Abstract: An improved membrane switch includes multiple detents. A pair of electric circuits are completed by the membrane switch. The switch includes the pair of open electric circuits, three flexing areas, and two membrane contacts. Normally the flexing areas bias the membrane contacts out of contact with the electric circuits. When a first actuation force is applied to the membrane, the intermediate flexing area flexes allowing the first circuit to be complete by the first membrane contacts. When a second actuation force is applied to the membrane, the center and outer flexing areas flex allowing the second circuit to be completed by the second membrane contacts. The inventive membrane switch provides the operator with a clear indication and a detent feel for each of the two circuits.

Abstract: An operating mechanism is disclosed for effecting actuation of rheostats, air valves, electric switches and the like using a single spring having a single apex whose movement effect operation of one or more devices. A further mechanism is disclosed for effecting movement of the spring apex whereby at least one additional spring is engaged during movement of the spring apex to provide increased resistance to movement of the spring apex thereby to provide tactile indication of the position of the operating mechanism.

Abstract: A multi-stage switch with a common actuating element and at least two switch elements for making contact provides that the switch elements are disposed next to each other above contact elements of a circuit board which they bridge in the closed state. The actuating element for the switch is movably disposed above the switch elements in such a way that the switch elements respond sequentially when the actuating element is depressed. Such a multi-stage switch can be produced cost-effectively with simple structural means, can be universally used, is easy to operate, maintenance free to the greatest extent and operates dependably.

Abstract: A two-step operation switch device, in which intervals between a common fixed contact and other fixed contacts juxtaposed to the common fixed contact are kept as wide as possible so that insulating properties between the contacts are maintained in a normal state. The common fixed contact 11, first fixed contacts 12, 13, and second fixed contacts 14, 15 are disposed on an insulating plate 1. A movable contacting piece 2 has a first contacting piece 21 slid in a first region, in which the common fixed contact 11 and the first fixed contacts 12 and 13 are juxtaposed, and a second contacting piece 22 slid in a second region, in which the common fixed contact 11 and the second fixed contacts 14 and 15 are juxtaposed. Intervals W2 between the common fixed contact 11 and the second fixed contacts 14 and 15 in the second region Z2 are wider than intervals between the common fixed contact 11 and the first fixed contacts 12 and 13 in the first region Z1.

Abstract: A multi-stage electrical rocker actuated switch assembly is disclosed which basically consists of a rocker operating element which is pivotably mounted on a housing and four plungers which face the underside of the rocker operating element with one of their ends while the other ends engage with a movable contact part.

Abstract: A select key is pivotable in a forward direction and a reverse direction to at least a step position and a fast position. In the fast position, the device functions are scrolled rapidly, and in the step position, the device functions are stepwise scrolled. A select key is centrally disposed on a rocking lever, enabling simple and efficient one-hand operation.

Abstract: The invention includes a mechanism for multi-dome switch having first, second, third and fourth collapsible dome structures. An elongated action bar extends across and bridges a pair of collapsible dome structures. The action bar, each have a top surface and a bottom surface. A notch is formed in the top surface closer to one of the dome structures. Engagement nubs extend downwardly from the bottom surface of the action bar near both ends and are positioned to be received in a respective depression formed on the top surface of the collapsible dome. A switch pedal is positioned for pivotal movement between a first and second forward positions, and a first and second backward (rear) positions.

Abstract: An improved membrane switch includes multiple detents. A pair of electric circuits are completed by the membrane switch, and a pair of flexing portions are located on said membrane. A first flexing portion is overcome by a first lower insertion force to allow a first circuit to be complete, and a second flexing portion is only overcome by further insertion force. The second flexing portion is eventually overcome and completes a second circuit. The inventive membrane switch provides the operator with a clear indication and a detent feel for each of the two circuits.

Abstract: A two-stage movement seesaw switch apparatus of the light irradiation type which is compact and superior in operation feeling. The two-stage movement seesaw switch includes a pair of operation plates disposed immediately below a manually operable knob. Two sets of push switches, each set including two push switches, are disposed such that a straight line interconnecting the push switches of each set extends obliquely with respect to a center axis of pivotal motion of the manually operable knob. The push switches are actuated by contact with the operation plates when the manually actuated knob is pivoted. Each of the operation plates has an opening formed therein for passing light emitted from an LED therethrough and has a pair of projections formed thereon next to the opening.

Abstract: An electrical switch, particularly for a breaking circuit includes first and second changeover switches. The first and second changeover switches each comprise first and second stationary contacts and a switching contact. A plunger is operatively connected to a rocker for causing the rocker to pivot between a non-operated position and an operated position. The second stationary contacts are associated with the non-operated position of the plunger. A spring is connected between the rocker and the switching contacts. The spring is arranged on the rocker and on the switching contacts so that at least when switching over from the second stationary contacts to the first stationary contacts the switching contacts are lifted off the second stationary contacts essentially synchronously.

Abstract: An apparatus (20) for controlling movement of a vehicle power window (22) between a fully open position and a fully closed position. The apparatus (20) comprises an energizable electric motor (66) for, when energized, moving the window (22). A switch assembly (62) for energizing the electric motor (66) to move the vehicle window (22) to one of the positions. The switch assembly (62) includes a first electrical contact (282) and a second electrical contact (284) electrically insulated from the first electrical contact. An electrically conductive disk (286) has a periphery (288) domed portion (290) and is in electrical communication with one of the first and second electrical contacts (282, 284) at a portion of a periphery of the disk. The other of the first and second electrical contacts (282, 284) is located adjacent the disk (286) and initially spaced from the disk.

Abstract: This apparatus incorporates an electric motor disconnecting safety switch within the motor's electrical terminal housing. This results in a single, compact device directly mounted to the electric motor body which is used for the safety disconnect as well as the termination point for the incoming power leads and the motor wire taps. The apparatus may be employed as a disconnecting device for single phase and three phase alternating current motors as well as various configurations of direct current motors. The apparatus further includes a simple and economical adapter plate mounting configuration which accommodates the device to a multiplicity of motor frames. This apparatus is used in three embodiments: the first being a rotary tumbler switching device with an external rotary hand operator; the second device being a draw-out disconnecting means; the third device including an integral motor starter which provides both disconnecting and motor controlling functions.

Abstract: A dual function button for keyboards and keypads. The button includes a first contact switch which is activated by a first manual pressure. The first contact switch is preferably formed by a resilient cover having a conductive pellet on its interior face, and a flexible substrate having spaced contacts below the pellet. The first manual pressure causes the pellet to impinge upon the spaced contacts, completing a first circuit. The button also includes a second contact switch which is activated by a second, greater, manual pressure. The second contact switch includes the resilient cover of the first switch, a rigid substrate mounting spaced contacts, and a flexible conductive dome mounted on the rigid substrate below the resilient cover. The second manual pressure will cause the dome to resiliently deform and impinge upon the contacts, closing a second circuit. In this manner two functions may be provided by a single switch. The two functions may advantageously be a dual-speed cursor control.

Abstract: An electrical switch assembly has a resilient dual detent dome carrying concentric electrically conducting pellets which sequentially contact conductive ends of traces on a printed circuit board in response to partial and full depression of the dome. The dome is designed to provide a first tactile feel when the first pellet contacts the circuit board and then a snap action tactile feel when the second pellet engages the circuit board.

Abstract: A switching apparatus which includes a rubber keypad (32, FIG. 2) with a rubber cap (36) that can be depressed by a person's finger to snap a snap dome (52) that connects contacts (21, 22) of a first switch (70), provides increased tactile feedback to the person's finger. A keycap (42) of rigid material includes a cover (44) lying on top of the rubber cap and also includes a stem (54) that projects down through a hole in the cap, with a lower stem end (60) lying above the snap dome to snap down the dome when a person's finger depresses the cover. The tactile snap feedback is transmitted directly through the rigid material of the stem to the rigid material of the cover, to the person's finger to indicate that the switch has been closed. The cap has a radially outer part (84), and an electrically conductive element (82) is mounted on the outer part to engage contacts (23, 24) of a second switch (80) to close it, before the snap dome is snapped to close the first switch.

Abstract: A switch assembly having a rocker type actuator user moveable for actuating plural switches in a housing. The rocker type actuator includes first and second rocker members journalled together for rotation about a common axis. The first member has a paddle extending out of the housing and a first cam portion for actuating a first switch upon initial rotation in one direction. Upon continued rotation in the same direction, overtravel of the first switch is absorbed by a torsion spring which permits resiliently biased lost motion of the first cam with respect to a second cam for subsequent actuation of a second switch. The torsion spring provides a significant increase in the force required to move the actuator between the first and second switch actuation to provide tactiley discernable feedback to the user of the state of switch actuations.

Abstract: A switch assembly having a rocker type actuator user rotatable for sequentially actuating plural switches. The rocker contacts, off center a lever beam supported at its end by plungers disposed to actuate the individual membrane switches or optical activators. User applications of an initial force to the rocker causes the lever beam to pivot about the remote plunger for actuation of the switch closest to the rocker contact point. After actuation of the closest switch, user application of a greater force continues rotation of the rocker to cause the lever beam to pivot about the closest plunger for causing actuation of the remote switch. Overtravel is shared by beam deflection of the lever and columnar compression of cylindrical tower portions of the resilient membranes.

Abstract: A two-way dual action electric switch assembly has an actuator that slides in housing from a neutral position to a first position to a second position and back to the neutral position in each direction. Travelling circuit boards are slideably disposed in the housing on either side of the actuator and a single elastomeric dome switch is disposed between the actuator and each travelling circuit board. A fixed circuit board is outboard of each travelling circuit board and a pair of second elastomeric dome switches are disposed between each travelling circuit board and its associated fixed outboard circuit board. The single elastomeric dome switches close electric circuitry of the travelling circuit boards in the first positions and the pairs of second elastomeric dome switches close electric circuitry of the fixed outboard circuit boards in the second positions.

Abstract: A three-position floating beam armature switch includes a hollow housing, in which a floating beam armature is resiliently biased toward the closed top of the housing. An operator member is carried by the housing to apply a predetermined force to the armature; so that a first end of the armature initially moves toward the bottom of the housing by pivoting the armature about its second end. Continued application of additional force by the operator member, causes the armature to pivot about the first end; so that the second end then moves toward the bottom of the housing. With both the first and second ends at the bottom of the housing, the third position of the switch is attained. Release of force by the operator member allows the floating beam armature once again to be biased toward the top of the housing to the initial position.

Abstract: A switching assembly having some conductor strips molded in the base and extending outwardly to form connector terminals. Other conductive strips are disposed on the surface of the base and have the ends extending outwardly to also form connector terminals. The conductive strips have other portions bent upward to plug directly into a printed circuit board. A plurality of switches are mounted on the base and a switch is mounted on the circuit board directly above a base mounted switch. User movement of cover mounted rockers actuates the base mounted switches through push pins passing through clearance holes the circuit board. The circuit board mounted switch after user effected rocker actuation absorbs overtravel resulting from continued user movement of the rocker and is operative to move a sliding plunger in the circuit board to operate the base mounted switch directly below.

Abstract: A push switch is capable of performing a first switching operation and subsequently a second switching operation when a pressing force is applied to the switch. The push switch includes (a) an insulating membrane having at least one dome with at least a portion thereof overlaid by or serving as an inner conductor and at least a portion of its outer periphery overlaid by or serving as an outer conductor, (b) an insulating substrate having thereupon an inner pole contact disposed at a position opposing to the inner conductor and an outer pole contact disposed at a position opposing to the outer conductor, respectively, and (c) a spacer placed between the insulating membrane and the insulating substrate for spacing the conductor apart from the pole contacts during the time when no pressing force is applied to the switch.

Abstract: A multi-step switch includes a resilient or resiliently mounted push button. In a first stage of the pressed-in state, the push button presses a contact surface against an at least partially resiliently constructed printed circuit board, which, on the upper side thereof, is provided with conductors. In a second stage of the pressed-in state of the switch, the push button and, in turn, the printed circuit board press with the aid of a resilient push element against additional conductors arranged underneath the printed circuit board. The multi-step switch is suitable for low switching capacities, particularly for use in hand-held control transmitters of remote controls.

Abstract: A switch device is provided in which a clicking touch can easily be set and which is able to stably perform a switching operation while maintaining a predetermined clicking touch, exhibiting a long life when operated and causing an advantage to be obtained in reducing a manufacturing cost. The switch device has an operating rod which is inward pushed by an end portion of an operation lever and a leaf spring which is operated by an operating rod when the operation lever is inclined by a predetermined degree, so that a desired clicking touch can be easily set by selecting the leaf spring and a problem of wear which is inevitable for realizing the clicking touch can be overcome.

Abstract: An electrical trigger switch for controlling current through a pair of main leads. The switch includes a guard, which physically protects the trigger button from being depressed accidentally, and also an electrical safety feature. Particularly in harsh environments, the mechanical protection afforded by the guard alone may be insufficient. The trigger button may be depressed unintentionally, causing accidental injury. Accordingly, the guard of the present invention includes an electrical safety switch. The safety switch moves from a safety state to an enable state only when the guard is pivoted upward to an armed position. Unless the guard is so pivoted and the safety switch is placed in an enable state, the safety switch will stay in a safety state, disabling the trigger button, even if the trigger button is depressed.

Abstract: The two-stage rubber switch comprises a housing; an operating knob; two push bodies slidably supported by the housing; a contact wiring board having four mutually-opposing contact end portions arranged two by two under each push body; a rubber switch member interposed between the housing and the contact wiring board and having four conductive contact pieces arranged so as to be opposed to the four mutually-opposing contact end portions, respectively on the contact wiring board; and two-stage switching members in particular, such as semispherical rubber buckling portions formed together with the rubber switch member or elastically slidable push members. Further, it is preferable to use some semispherical rubber buckling portions of the rubber switch member as click feeling providing members.

Abstract: A switch assembly having first and second snap acting switches sequentially actuated by user movement of a single rocker which contains a cantilever blade spring for effecting actuation of the first switch; and, upon continued user movement of the rocker overtravel of the first snap acting switch is absorbed by resilient movement of the cantilever blade member.

Abstract: A manually operated switch that combines spring and contact functions in a low profile, machine-insertable component. The switch readily mounts onto a printed wiring board. It includes a cantilevered leaf spring member having one free end and a pair of spaced-apart fulcrums at the other end; one of the fulcrums being at the point of attachment of the leaf spring to the printed wiring board and the other being a re-entrant bend in the leaf spring in the vicinity of its center. An actuator is positioned to apply a force between the fulcrums such that the free end moves in a direction opposite to the direction of the applied force. Each spring member in combination with suitably placed contact pads is capable of providing a separate switch operation such as: "make" operation, "break" operation, or make-before-break "transfer" operation. A single actuator operates one or more spring members, each independently providing a different one of the above-described switch operations.

Abstract: A time difference switch turns on and off two electric circuits, under the operation of a common operating member, with an adequate time difference. The section of the switch that defines a step dimension that facilitates the time difference is relatively short, and for this reason, the likelihood of a change in the predetermined step dimension, i.e., in the time difference, is lessened. Thus, a time difference switch providing a predetermined accurate time difference is provided.

Abstract: Apparatus in a trigger grip switch assembly for sequential actuation of first and second electrical switch banks. First and second actuating elements each have a base portion, a switch-actuating arm extending from the base portion, and a resilient pressure-transferring arm extending from the base portion at an acute angle to the respective switch-actuating arm. The respective base portions are mounted for pivotal movement relative to the respective first and second switches and for presenting the switch-actuating elements in respective proximity to the first and second switches for actuation thereof upon base portion pivoting movement and for presenting the pressure-transferring arms in mutually overlapping relation with a distal end portion of a first pressure-transferring arm in contact with a medial portion of a second pressure-transferring arm. The pressure-transferring arms form between them an angle at least slightly greater than 30 degrees to provide an over-centered stable relationship.

Abstract: A latch/switch mechanism is attached to and operative for inserting and securing circuit modules into a housing while at the same time creating differing electrical connections during the insertion process. The latch/switch mechanism includes a latch lever with a cam and also included means to engage a support housing such as a notch or clip in the lever. The cam portion sequentially engages a plurality of conductive leaf springs and as the lever is rotated, the cam forces the making and breaking of certain connections of the conductive leaf springs to effect the various desired circuit connections and disconnections.

Abstract: The invention relates to a compact, mechanically operated switch which is especially suitable for use in a telephone set having a loudspeaker receiving function. The switch includes a housing and, disposed therein, a first and a second rotor for opening and closing cooperable contacts and a third rotor for restricting the rotation of the second rotor under a certain condition. All the rotors are disposed in axial alignment with each other. The first and second rotors are urged to rotate in one direction while the third rotor is urged to rotate in the other direction by the action of a force greater than that urging the second rotor to rotate in the one direction. A pushbutton is disposed between the first and second rotors and acts, when depressed, to forcedly rotate them in the other direction so as to establish a loudspeaker receiving circuit. A lock pin cooperates with the pushbutton to lock it in a depressed position.

Abstract: A keyboard switch apparatus for an electronic musical instrument has first and second switches each constituted by stationary and movable contacts. The stationary contacts of the first and second switches are formed adjacent to each other on a single board. The movable contacts of the first and second switches are mounted on a single flexible member arranged above the single board and are normally spaced apart from the stationary contacts at positions opposite thereto. The flexible member and the movable contacts of the first and second switches are integrally formed to have a uniform cross-sectional shape along one direction. The flexible member is deformed in response to the depression of a key. The stationary contacts corresponding to the movable contacts of the first and second switches are closed with a time difference according to a speed of key depression.

Abstract: An electric switch construction having a housing with electric terminals, two concentric springs disposed in the housing and respectively connected with the terminals, and a movable contactor cup adapted to establish continuity between the terminals and a conductive, barrel portion of the housing. The outer spring biases the cup to a circuit-closing position wherein both terminals are connected to the barrel portion of the housing. A manually-engageable plunger is arranged to engage the cup. When the plunger is actuated, first one terminal is disconnected from the barrel portion of the switch, and subsequently, upon further movement of the plunger, the remaining terminal is disconnected therefrom. The plunger carries an O-ring which forms a partial seal along the bore of the housing, so as to minimize the accumulation of dirt or moisture from the surfaces where electrical contact is made or broken.

Abstract: A variable control device comprises a manually operable member (5) arranged to be moved in a first direction (A) by an operator. A substrate (2) is provided with a plurality of contacts (4) spaced apart in a plane transverse to the first direction. A further member (6) is disposed between the manually operable portion (5) and substrate (2), The further member (6) is provided with a conductive surface facing the substrate (2). Movement of the manually operable portion (5) in the first direction (A) causes deformation of the further member (6). Contacts 4 on the substrate are progressively bridged by the further member conductive surface as deformation of the further member (6) increases.

Abstract: An interlock switch used with an electrical appliance such as a microwave oven. The interlock switch includes a cantilevered common switch element, and two other switch elements mounted on opposite sides of the common switch elements. When the appliance door is closed, the common switch element makes contact with the switch elements on one side and breaks contact with the switch element on the other side.