Abstract: A speaker comprises a housing, a transducer residing inside the housing, and at least one sound guiding hole located on the housing. The transducer generates vibrations. The vibrations produce a sound wave inside the housing and cause a leaked sound wave spreading outside the housing from a portion of the housing. The at least one sound guiding hole guides the sound wave inside the housing through the at least one sound guiding hole to an outside of the housing. The guided sound wave interferes with the leaked sound wave in a target region. The interference at a specific frequency relates to a distance between the at least one sound guiding hole and the portion of the housing.

Abstract: An electronic device having a detachable layered accessory case includes a communication unit, and a layered accessory case capable of being coupled to or separated from the electronic device, wherein the layered accessory case includes a first case configured to cover at least a portion of the electronic device, and a second case configured with a layered structure in the first case. A communication functional unit is capable of delivering a signal with respect to the communication unit, and may be disposed in one or both of the first case and the second case.

Abstract: A space where a member is disposed is ensured in a central portion without changing dimensions of an appearance. In a push-button switch, a movable contact portion is disposed while bent in an outer peripheral space between an insertion pipe and sidewalls constituting a quadratic-prism lower case, and the sidewall closest to a position where a projected terminal portion is disposed differs from the sidewall closest to a position where an abutment portion is disposed.

Abstract: A switch has a normally-closed fixed contact unit, a common contact unit, a pressing member, and a movable contact that is attached to the pressing member, and that slides on the normally-closed fixed contact unit and the common contact unit. A conductive region and an insulating region are formed on a sliding surface of the movable contact in the normally-closed fixed contact unit in order toward a pressing direction of the pressing member. A conductive region and an insulating region are formed on a sliding surface of the movable contact in the common contact unit in order toward the pressing direction. The movable contact slides from the conductive regions to the insulating regions to switch from a closed state to an opened state.

Abstract: An exemplary electronic device includes a casing with a slot defined in an outer face of the casing, a through holed defined in the slot, and a switch module. The switch module includes a switch received in the casing, and a slidable button embedded in the slot. The slidable button includes an operating portion received in the slot and abutting an outer face of the casing, a holding portion extending outwardly from the operating portion and through the through hole, and two elastic arms respectively extending outwardly from two lateral sides of the holding portion. Each elastic arm includes a connecting section extending outwardly from the holding portion and a locking section protruding outwardly from the connecting section towards the operating portion. The locking sections of the elastic arms abut an inner face of the casing, whereby the slidable button is fixed to the casing.

Abstract: An electronic device and a slide switch are disclosed. The slide switch includes a main body, a slider, a rotary plate rotatably connected to the main body, and a rotary arm. The main body includes a fixing space, a channel, and a first contact member protruding from a bottom of the fixing space. The slider is movable between a first position and a second position within the channel. The rotary plate includes a lateral surface and a second contact member protruding from the lateral surface. Two ends of the rotary arm are respectively connected to the slider and the lateral surface. When the slider is located in the first position, the first contact member spaces from the second contact member; when the slider is moved to the second position, the rotary arm rotates the rotary plate causing the first contact member to contact the second contact member.

Abstract: A push button switch includes a hollowed housing, an electric switching circuit coupled to the hollowed housing and a stack of non-conductive sliders disposed within a narrow recess in the housing. An array of externally accessible push rods extends vertically through the housing and is used to longitudinally displace certain sliders into selective engagement with movable contacts in the electric switching circuit. A plurality of outwardly protruding projections are formed on at least one of the front and rear surfaces of alternating sliders, each projection being generally circular in transverse in cross-section and in the range of approximately 0.001 inches to 0.004 inches in height. The entire surface contact established between adjacent sliders is achieved through the one or more projections, thereby reducing the frictional forces experienced within the stack during slider displacement.

Abstract: A sliding button mechanism includes a housing, a button, a connecting member, two resilient elements, and a printed circuit board. The housing defines a sliding slot. The button is slidably received in the sliding slot. The connecting member is secured on the button. Two resilient elements are disposed between the housing and the button provides a resilient force to the button. The printed circuit board is secured in the housing and includes at least two contact areas. The connecting member continuously and simultaneously connects to the two contact areas to achieve a continuous adjustment function.

Abstract: A slide operating device (e.g., fader device of a mixer) has a moving block 5 which is slidable along a moving guide 3 and a secondary moving guide 4. The moving guide 3 is composed of a non-magnetic stainless shank 31 and a scale portion 32 formed by magnetizing a permanent magnetic member to have magnetic poles (markings). The moving block 5 is provided with a magnetic sensor 7 opposed to the scale portion 32. The magnetic sensor 7 senses magnetic poles provided on the scale portion 32. Mounting hardware 11A, 11B are provided as stoppers which stop a lever 6a of an operating knob 6. Areas outside a range sandwiched between the stoppers where the magnetic sensor 7 is allowed to travel are dead zones 3A, 3B which do not have magnetic poles.

Abstract: A side key assembly is mounted on a housing (60) which comprises a sidewall (610). A socket (62) is formed in the sidewall (610) of the housing. The side key assembly includes a button (70), two switches (80) and the socket. The button includes an operating portion (710), two touching blocks (740) and at least one elastic arm (750). The operating portion is slidingly received in the socket. One end of the at least one elastic arm connects with the operating portion while the other end is firmly fixed on the housing. Each switch includes a contact portion. Each contact portion is positioned adjacent to a corresponding touching block. Each switch is turned on when the corresponding touching block is moved to touch the contact portion thereof.

Abstract: A portable electronic device (10) is provided. The portable electronic device includes the keypad assembly (20). The keypad assembly includes key buttons (30 or 60). Each key button includes a key portion (32 or 62), a supporting portion (34 or 66), a switching portion (35 or 64), a pad portion (36 or 67), and a circuit board portion (38 or 68). The supporting portion defines a first through hole (344 or 664). The switching portion includes at least one switching elastic sheet (354 or 644). The pad portion includes a base body (362 or 672) and a protruding portion (364 or 674). The circuit board portion includes a first contacting point (3821 or 6821), a contacting sheet (384 or 684), and at least one second contacting point (3822 or 6822).

Abstract: A switch (100) comprises a dielectric housing (1), a number of stationary contacts (2) disposed in the housing (1), a moveable contact (3) and a slide element (4) movably mounted in the housing (1), a spring (5) disposed in the housing (1), and a cover (6) attached to the housing (1). The housing (1) defines a bottom wall (11) and four side walls extending from the bottom wall (11), the bottom wall (11) of the housing (1) having a locating post (16) cooperating with a side wall of the housing (1) to confine the spring (5). The slide element (4) defines a slide groove (420) which receives the locating post (16) so as to guide the spring (5) in the housing (1) steadily.

Abstract: A switch device includes a wiring board having a cutout provided therein, a land provided on an upper surface of the wiring board around the cutout, and a switch. The switch includes a lever, a switch contact activated upon the lever being moved in a predetermined direction, a case including a step portion protruding from a surface thereof and positioned in the cutout of the wiring board, and a terminal protruding from the case and mounted on the land of the wiring board. The switch device securely holds the switch on the wiring board with a simple structure, and allows the switch to be activated reliably.

Abstract: In a multidirectional operation switch apparatus, a rotary switch is switched on by rotating a dial, and push switches are switched on by sliding the dial in multidirections by means of a sliding section. The sliding section is made of a single constituting member. The sliding section is provided on an upper surface thereof with an upper rail part which slides a pad in X direction (direction of arrow “c-d”; FIG. 3), and is provided on a lower surface thereof with a lower rail part which slides the pad supported by the sliding section in Y direction (direction of arrow “a-b”).

Abstract: A portable electronic device (10) is provided. The portable electronic device includes the keypad assembly (20). The keypad assembly includes key buttons (30 or 60). Each key button includes a key portion (32 or 62), a supporting portion (34 or 66), a switching portion (35 or 64), a pad portion (36 or 67), and a circuit board portion (38 or 68). The supporting portion defines a first through hole (344 or 664). The switching portion includes at least one switching elastic sheet (354 or 644). The pad portion includes a base body (362 or 672) and a protruding portion (364 or 674). The circuit board portion includes a first contacting point (3821 or 6821), a contacting sheet (384 or 684), and at least one second contacting point (3822 or 6822).

Abstract: An electronic device includes a cover with a housing therein, a base coupled to the cover so as to form a receiving space, a circuit board received in the receiving space, and a slide button mounted to the cover. A bottom of the housing defines a first cutout and a second cutout therein. The circuit board includes a switch mounted thereon. The slide button includes an operating portion, an activating portion, and a positioning portion. The operating portion is slideably received in the housing for being operated to slide the operating portion in the housing. The activating portion extends from the operating portion through the first cutout. The positioning portion connects to the activating portion, and is spaced apart from the operating portion. The positioning portion is insertable through the second cutout and is blockable by the bottom from disengaging from the second cutout.

Abstract: An electrical contact assembly includes an electrical terminal, a push button, and a contact member adapted to be in electrical contact with the electrical terminal when the push button is compressed. The contact member has a first contact portion forming a first angle with a surface of the electrical terminal, and a second contact portion forming a second angle with the surface of the electrical terminal. The second angle is smaller than the first angle, and the second contact portion is adapted to slide on the surface of the electrical terminal when the push button is compressed.

Abstract: A slide switch (100) includes a housing (1), a plurality of stationary contacts (2) embedded in the housing, a slide member (4) moveably contained in the housing, and a cover (6) attached to the housing. The housing includes a bottom surface (10) and a plurality of side surfaces (11) therearound, and said bottom surface and side surfaces cooperatively defines a cavity. The slide member includes a containing portion (42) and an operating portion (41). A coil spring (5) is sandwiched between one end of the containing portion and corresponding side surface of the housing, and the moveable contact (3) is attached to the containing portion. The containing portion includes a rib (421) at an upper portion of an opposite end thereof for abutting against opposite side surface of the housing, and the rib is higher than the spring in vertical direction.

Abstract: An electrical switch has a common contact body and a first selective contact body and a second selective contact body. A contactor is connected mechanically and in an electrically conducting manner to the common contact body. The contactor comprises an elastic, electrically conducting material. It is formed originating from the basic form of a leaf spring into a multifunctional part having a clamping area, a deformation area and a stiffened actuating area. The pre-tension of the contactor causes the contact fingers to be positioned against the contact surfaces of the first selective contact body. Pressure on the actuating area elastically deforms the contactor, and the actuating area pivots with the contact fingers so that the contact fingers switchingly enclose the contact surfaces of the second selective contact body.

Abstract: A slide switch 100 according to the present invention includes a slider 20, a case 10 into which the slider 20 is inserted, performing switching by a sliding operation of the slider 20, cushioning means (an upper part, a left part, and a right part) 21a, 21b, and 21c, provided at contacting places in the side of the slider where the slider 20 and the case 10 come into contact by the sliding operation of the slider 20 for relieving the contact, and a cushioning means holding member 21 for integrally supporting the cushioning means, wherein the case 10 has case inner faces on which the slider 20 slides, and which face each other along a horizontal direction, one of the inner faces of the case 10 has a positioning part 11a for positioning the slider 20 at three positions, and the other of the inner faces of the case 10 has a positioning part 11d for positioning the slider 20 at two positions.

Abstract: A switch device includes a wiring board having a cutout provided therein, a land provided on an upper surface of the wiring board around the cutout, and a switch. The switch includes a lever, a switch contact activated upon the lever being moved in a predetermined direction, and a case including a step portion protruding from a surface thereof and positioned in the cutout of the wiring board, and a terminal protruding from the case and mounted on the land of the wiring board. The switch device securely holds the switch on the wiring board with a simple structure, and allows the switch to be activated reliably.

Abstract: A switch is disclosed having a switch housing defining a housing interior and an access opening that extends through a wall of the housing to the housing exterior. An actuator assembly including a shaft constrained by said housing moves along a path from a normal position to an actuated position as well as a momentary position. The shaft has an actuating portion which extends outwardly from the housing interior through the access opening. A shaft body inside the housing including a generally planar contact support hat supports a number of switch contacts. A housing base positions a number of terminals having conductive surfaces for biased engagement with selected switch contacts to form an electrical path between terminals when the actuator assembly is in one of either the normal, actuated or momentary positions.

Abstract: An architectural preset rotary and preset slide control device comprising an N-mode latch mechanically coupled to a switch having a pole and a plurality of receiving terminals. The device further comprises a variable control component that is electrically coupled to the switch such that when the latch is activated into one of the N modes, the switch pole is caused to be electrically coupled to one of the receiving terminals allowing electrical energy at the pole to be routed through the switch to one of the receiving terminals. The variable control component controls the amount of electrical energy that is routed through the switch. The device has a modular design in that the switch, latch, variable control component and other parts of the device are single piece parts that facilitate the assembly of the device during its manufacture.

Abstract: A push switch includes an operating body, a case, a return spring, and a light source. The operating body is controlled by push operation, includes a through-hole in the center and a display portion at the upper edge of the through-hole, and supports a movable contact unit. The case has the insert hole on a bottom surface opposing the through-hole and fixed contact units on an inner surface of the sidewall. The movable contact unit comes into contact with fixed contact units. The return spring is interposed between the case and the operating body and returns the position of the operating body in the reverse direction of the push operation. The light source stored in the insert hole and the through-hole. The through-hole is formed linearly in the direction the operating body is moved during the push operation so that the light source does not interfere with the operating body.

Abstract: The switch is comprised of a case, a first fixing terminal formed with a contact section exposed at the bottom surface of the case at one end with the other end being outside of the case, a second fixing terminal formed with a contact section exposed at a side surface of a case at one end and with the remaining end being provided outside of the case, a contact piece provided within the case, formed with a fixed contact section always in contact with the first fixing terminal at one end and a moveable contact section capable of contact with the other second fixing terminal at the other end, and with a coil spring section having resilience in a coil winding direction and compression direction at a central section, and an operation body with one end positioned within the case so as to form a pressing section capable of pressing the contact piece in a direction of compression and another end being positioned outside of the case so as to form an operation section pressed from outside.

Abstract: An architectural preset rotary and preset slide control device comprising an N-mode latch mechanically coupled to a switch having a pole and a plurality of receiving terminals. The device further comprises a variable control component that is electrically coupled to the switch such that when the latch is activated into one of the N modes, the switch pole is caused to be electrically coupled to one of the receiving terminals allowing electrical energy at the pole to be routed through the switch to one of the receiving terminals. The variable control component controls the amount of electrical energy that is routed through the switch. The device has a modular design in that the switch, latch, variable control component and other parts of the device are single piece parts that facilitate the assembly of the device during its manufacture.

Abstract: A microswtich that is easy to assemble and manufacture is provided. The microswitch constantly keeps the first conductive section of a resilient component for opening/closing an electrical switch in contact with the first conductive terminal in the main body of the microswitch, and houses a plate-shaped second conductive section with a contact surface inside the main body of the microswtich, so that the second conductive section of the resilient component is driven by a press button on the contact surface of the second conductive terminal to preset the signal from an initial connection state to a final connection state in order to increase the distance required for controlling the signal connection and allow the resilient component to have an effective deformation and provide the best resilience of the press button.

Abstract: A lever switch includes a case, and a stationary contact, common contact, movable contact and lever which are disposed in the case. The movable contact is made up of elastic metal and includes a stationary portion, contact portion, and a curved portion located between the stationary portion and the contact portion. The stationary portion is connected to the common contact. The movable contact is disposed in a state of bending so that the contact portion may come in contact with or apart from the stationary contact. An operating portion is protruded from an opening, and a driving portion is located inside the case and abuts on the curved portion of the movable contact. When the operating portion is manipulated, the driving portion pushes the curved portion, and then the contact portion comes in contact with or apart from the stationary contact.

Abstract: The data connector of the present invention securably receives at least two distinct types of mating connector plugs having different contact arrangements. The data connector includes a housing having a mating connector receiving cavity partially defined by a rear wall. The data connector further includes a printed circuit board (PCB) positioned within the housing cavity wherein the PCB has a plurality of signal contacts electrically coupled thereto and extending from a top surface thereof. The signal contacts, which are used to frictionally engage mating contacts in the plugs, are desirably arranged in at least two vertically spaced rows to accommodate the distinct plug configurations. Mounted behind a back surface of the PCB, the data connector includes cable termination assemblies for receiving and terminating individual conductors of a multiconductor cable. The conductors are electrically connected to the signal contacts via an electrical trace on the PCB.

Abstract: The push switch of the invention includes: a case including a plurality of contact terminals placed on an inner bottom surface thereof and a contact member that includes a plurality of conductive protruding portions which come into contact with the plurality of contact terminals at selected positions while sliding on the inner bottom surface of the case; a fulcrum portion supported in a rotatable state by an axis parallel to the inner bottom surface of the case; and an elastic bent portion for connecting the protruding portions with the fulcrum portion. The push switch further includes a sliding body which is supported so as to move up and down along a direction vertical to the inner bottom surface of the case thereby pressing the contact member and sliding the conductive protruding portions in accordance with the vertical motion in order to switch the contact terminals between an electrical connection state and an electrical disconnection state.

Abstract: In known electrically operated handheld machine tools, a potentiometer serving to control output must be balanced so that a desired tap resistance can be tapped at the potentiometer in a determined adjustment position of the potentiometer. To reduce manufacturing expenses, this balancing is effected without required additional structural component parts or costly additional devices.The potentiometer (20) has a resistance path (21) with which a slider (22) is in electrically conducting contact by pressing. The slider (22) can be actuated manually by an actuating member (15). The slider (22) and actuating member (15) have means (26) for adjusting their relative position with respect to one another after their insertion into a housing (11) of the handheld machine tool.

Abstract: A switch compartment 20R is formed in a switch body 20 of electrically insulating material and opens at the top surface of the body. First and second fixed contact members 23C, 24C are secured to the opposed inner walls of the compartment. The open top of the compartment is closed by a cover having a through-bore 32 facing the compartment. An actuator 10 is accommodated in the compartment and outwardly biased by a coil spring 26. The actuator 10 comprises a stem portion 13 protruding through the through-bore and a contact holder block 12 joined to the lower end of the stem portion. The holder block has a housing slot 11 extending therethrough from its front end face to its rear end face. The undersurface of the holder block is formed with a guide slit 18 extending therethrough from the front end face to the rear end face in communication with the housing slot.

Abstract: There is provided a switching device in which the interval between a normal-close contact and a normal-open contact and the positions thereof can be arbitrarily set without any constraint of a common contact, and which can perform circuit switching at a desired timing. In the switching device, mounted on an inner bottom plane of a wafer is a common contact on which a good conductive return spring electrically connected to a movable contact for urging a slider in the direction reverse to the depressing direction is laid. A normal-close contact and a normal-open contact are arranged side by side on an inner wall of the wafer, and a resilient piece of the movable contact is in slidable contact with the inner wall.

Abstract: A movable electrical contact assembly forms a potentiometer and includes at least one strip of electrically conductive material having a significant resistance, a conductive rolling contact device in contact with the strip, a mechanism for moving the rolling contact device along the strip, and the rolling contact device or the strip being made of a deformable conductive material. In one preferred embodiment, two strips are provided at least one of which has a significant resistance. Also in one embodiment, the rolling contact device is deformable and is defined by a conductive elastomeric contact roller.

Abstract: In an electric switch a good gliding behavior between a bridging contact and metal conductors punched out from a sheet metal blank is achieved. For this purpose the metal conductors have at least one projection extending at least over the entire range of motion of the bridging contact.

Abstract: Push-button switches include a housing which defines an interior space and an opposed pair of longitudinally oriented recessed channels. At least upper regions of the recessed channels are open to said defined interior space. A pair of elongate fixed contact strips are each positioned within a respective one of the defined recessed channels, the fixed contact strips being of a sufficient length so that a terminal end portion thereof is disposed in the open upper region of the recessed channel to thereby be exposed to the interior space of the housing. In this regard, the housing preferably includes interior cover walls covering a major extent of the recessed channels so that the terminal end portions of the fixed contact strips positioned therewithin are exposed to the defined housing interior space.

Abstract: A power switch is provided for control of the electric motor of a power hand tool, such switch including a shorting bar to achieve a dynamic brake on the motor after the termination of the application of power thereto. In one embodiment of the invention, the shorting bar is fixed within the switch housing and moving contacts upon the slide are brought into contact therewith after the slide has moved a sufficient distance to terminate the interconnection between the power source and the motor. In another embodiment, the shorting bar is maintained upon the slide and engages fixed contacts interconnected with the motor when the slide has moved a fixed distance beyond a point of disconnecting the power source from the motor.

Abstract: A spring-return switch comprises: a case; a common contact embedded in the inner surface of one of the opposite side walls of the case; a transfer contact embedded in the inner surface of the other side wall opposite to the common contact; a slider supported for vertical movement within the case and integrally provided with an operating rod; a movable contact held by the slider and having a base portion held by the slider, a first contact arm in continuous contact with the common contact and a second contact arm to be brought into contact with or to be separated from the transfer contact; and a return spring biasing the slider upward so that the slider is pressed resiliently against the inner surface of the upper wall of the case. The operating rod is dislocated from the center of the slider toward the transfer contact so that most part of pressure applied to the operating rod to depress the slider is exerted on the second contact arm of the movable contact.

Abstract: A push-button switch is provided which includes a base plate having terminals extending therethrough and solderable in a p.c. board. A housing is subsequently snap-assembled with the base plate and carries a push-button member which is reciprocable when manually pushed. Cam tracks are provided in the housing and a cam follower lever is pivotally mounted on the push-button member. The lever is accessible through an aperture in the housing for engagement with either of the cam tracks. One of the cam tracks produces momentary action, while the other produces alternate action.

Abstract: An electrical connector device has first and second male terminal sets adapted to couple with matched female connector devices. The electrical connector device has particular utility in coupling an auxiliary generator with female power take off receptacles to a conventional receptacle in a wiring circuit. The device includes a switch mechanism associated with each terminal set to avoid exposure of energized terminals. The switch mechanism preferably takes the form of a plunger which is reciprocable between a retracted position and an extended position. In moving the plunger between its retracted and extended positions the plunger "makes" and "brakes" contact respectively for its associated terminal set with internal conductors in the connector device. The electrical connector device is adapted for all types of electrical power connections, including conventional 110 volt and 220 volt circuit receptacles.

Abstract: A plunger axially depressible within a tubular housing against a return spring has a conductive pin contact contained within a helically shaped slot through the plunger to project radially from opposite sides of the plunger. A spring biases the pin toward a first pair of stationary contacts. Depression of the plunger effects abutting engagement of the pin on the stationary contacts and continued depression causes the slot to rotationally wipe the pin on the stationary contacts. A conductive washer is slidably disposed over the plunger, keyed to a helical track on the exterior surface of the plunger to cooperatively abut and subsequently rotationally wipe a second pair of stationary contacts to provide a second pole for the switch.

Abstract: A miniature ratchet type push button activated electrical switch wherein a first electrical contact is caused to sweep across and briefly contact a second electrical contact upon depression of a push button to transmit an electrical pulse. The rotation is driven by the free expansion of a spring upon depression of the push button beyond a preselected depth, and therefore results in a pulse of uniform duration independent of how quickly the push button is depressed or how long it is held in its depressed state.

Abstract: A push lock mechanism including a heart-shaped cam groove, a driving pin adapted to trace in the heart-shaped cam groove, and an axially reciprocatable operation shaft adapted to be locked in a depressed position thereof by cooperation of the heart-shaped cam groove and the driving pin.

Abstract: A tease-free switch includes a plurality of electrical terminals of planar configuration disposed in spaced apart relationship upon an electrically insulating base as well as a generally planar contact plate including at least two electrical contact regions thereupon. The plate is engaged by a push-button actuated stepping mechanism so as to be alternately rotated between a position where contact between particular of the terminals is alternately established and terminated. The switch is configured so that the contact plate is constantly biased into contact with the terminals and/or the insulating surface upon which they are disposed. In this manner partial activation of the switch will not alter the condition of the electrical contacts.

Abstract: The electric push-button switch comprises a housing portion and a linearly moveable push-button portion. Guide columns at the housing portion and the push-button portion attain accurate linear guiding and rotational positioning of the push-button portion. These guide columns mutually interact or interengage and are in multiple line contact with one another. This multiple line contact extends in the direction of movement of the push-button portion. The length of such line contact is variable between a rest position and an operating position of the push-button portion. This line contact is greatest when the push-button portion assumes its operating position. A contact surface of a fixed counter contact comprises a planar slide surface for resilient contact arms carried by the push-button portion. The friction arising during the forced sliding movement of the resilient contact arms over the contact surface produces self-cleaning of the contacts and damping of contact chatter movements.

Abstract: A subminiature push-button switch has a pivot block provided below a plunger serving as an actuating member, a shaft provided either on the pivot block at its central portion between the left and right sides thereof or on an upstanding projection provided substantially at the center of a switch base, and a depression corresponding to the shaft formed either on the projection or pivot block. The pivot block is placed on the projection, in a state where the shaft and depression are in engagement with each other, so as to be freely rockable from side to side by the plunger. A movable contact attached to the pivot block is rocked from side to side by rocking the pivot block, whereby the movable contact makes and breaks contact with fixed contacts fixedly secured to the switch base.