Abstract: Membrane switch assembly comprises a substrate, a membrane, and a separator between the opposed surfaces of the substrate and membrane. Opposed switch electrodes are provided on the opposed surfaces and circuit conductors are provided which extend between and among the electrodes. The assembly has a composite tail made up of a substrate tail section and a membrane tail section. The two tail sections are co-extensive and parallel. Substrate leads extend from the substrate onto the substrate tail section and membrane leads extend from the membrane onto the membrane tail section, the leads being parallel and offset from each other. Portions of the substrate tail section extend through slots in the membrane tail section and portions of the membrane tail section extend through slots in the substrate tail section.

Abstract: An integral switch means on a printed circuit board is provided by a plurality of parallel conductor segments having insulating gaps which are aligned in a column transverse to the conductor tracks. Posts supported on the printed circuit board support and align a rigid support member for an elastomeric member having a plurality of conductor strips positioned to separately bridge the respective gaps of the connector segments on a printed circuit board when the elastomeric member is positioned against the printed circuit board. Spring biasing means extends between support posts and the rigid support member for normally urging the elastomeric member into the printed circuit board in position to close the switches. Actuator means is movably supported relative to the printed circuit board to cooperate with the support member to move the elastomeric member against the bias of the spring away from the printed circuit board.

Abstract: A multiple flat-type switch consisting of three foils of insulating material placed on top of each other and bonded to one another. The center foil is provided with holes and the two outer foils are provided on their insides with contact surfaces which come into contact with one another when a pressure is exerted upon the foil arrangement. For the purpose of achieving a switch having a large overtravel (overlift) the contact surfaces are arranged in one row along the edge of the foil arrangement, while the leads extend almost vertically in relation to the edge of the foil. The foil arrangement is slotted from the edge within the area of the contact surfaces, and arranged on a foam-plastic base. For preventing the metallizations from being damaged, metal-free regions are provided for at the points of pressure attack, and the contact surfaces of the upper foil are connected in a spiral-shaped manner to their respective terminals within the area of the holes of the center foil.

Abstract: A snap action keyboard switch mechanism is presented wherein protrusions located on the switch sheet between adjoining snap action elements act to support the switch sheet and avoid inadvertent input. If a key is actuated off center, the support protrusions will prevent erroneous actuation of an adjoining key. The protrusion height varies depending upon the desired optimum tactility.

Abstract: An electronic keyboard includes a base defining a surface having a plurality of faces oriented at different angles. A flexible printed circuit defining rows of switches is disposed on the base surface and rows of switch actuators are disposed on the printed circuit. The actuators comprise key guide strips which define key positions offset along the rows from the switch positions and spring strips which bridge the key and switch positions so that, when keys slidably mounted in the key guide strips are depressed, they close the associated switches. The spring strips are designed to produce minimum operator fatigue and all of the keyboard components coact to give the keyboard a very low profile.

Abstract: A device for selectively connecting a plurality of circuit elements in a thick/thin film circuit comprising, a pivot pin mounted to the film circuit and a manually rotatable contact element mounted to the pin. Contact fingers emanating from the contact element communicate with contact pads connecting a different set of film circuit elements together each time the contact element is rotated.

Abstract: A spacerless switch circuit for use in multiple switch keyboards includes a first base member having a front surface and a second base member having a front surface in touching relationship against the front surface of the first base member. A plurality of first and second conductor traces are respectively deposited on the front surfaces of the first and second base members. An insulative layer is deposited over regions of either or both of the first and second conductor traces to insulate the conductor traces from each other when the front surfaces of the two base members are touching one another. One or more first switch contacts are deposited on the first base member and one or more facing second switch contacts are deposited on the second base member to define one or more on/off switches.

Abstract: Encoded keyboard switch comprises a single sheet of flexible film which has switch electrodes and circuit conductors applied to one surface. The sheet of film is folded to form four sections. After folding, the switch electrodes of the two upper sections are opposed to each other and the electrodes of the remaining two sections are opposed to each other so that when the folded film is pressed at a switch site, the two switches formed by the opposed electrodes are sequentially closed. The switch electrodes are interconnected in accordance with an improved encoding scheme which results in a reduced requirement in the number of circuit conductors, the elimination of some switch electrodes, and other advantages.

Abstract: A structure and a method for manufacturing a contact disk for detection of angular position and direction includes a concentrically-arranged planar slip-ring like conductive layer at the innermost region of the disk, a first gear-pattern like conductive layer, having outer teeth, at its midway region, and a second gear-pattern conductive layer, having internal teeth at the outermost region of the disk, all formed on an insulative substrate; the gear-pattern conductive layers are both printed at the same time to insure high accuracy in the position of the conductive layers; crossing parts of the lead connections are printed with the use of an insulative film therebetween.

Abstract: A conductive adhesive for use in membrane switch and printed circuit technologies consists essentially of a resin modified copolymer of butadiene and styrene and a conductive element. The conductive element is preferably a material such as acetylene black and is more than two percent and less than 40 percent by weight of the adhesive. The conductive adhesive may be used to secure the membrane and substrate of a membrane-type switch thereby providing a conductive path between the membrane and substrate. The adhesive may also be used to attach a membrane switch tail to an associated printed circuit board or the like, again with the conductive properties of the adhesive providing a current path as well as the conventional adhesion between the two parts.

Abstract: A power mirror remote control switch includes a switch body which supports a printed circuit board and two stacked, insulated levels of conducting terminal fingers which extend over the board. A four-way position control key overhangs the terminal fingers. The control key is pressed to flex selected terminals into conductive contact with underlying portions of the printed circuit board, thereby establishing conductive connections for energizing motors which rotate or tilt at least two power mirrors. A sliding switch is provided to define which one of the two mirrors is to be moved in the direction defined by the position control key.

Abstract: A unitized manual actuator assembly is attached to a printed circuit board for operating poppet switches mounted thereon. The actuator assembly comprises a two-piece housing having a pair of integral tube guides disposed in the housing. A pin is slideably disposed in each tube guide with one end protruding out of the housing for operating the switches. The internal end of each pin has an integral hollow cap covering and protecting the upper open end of its associated tube guide. A coil spring surrounds each tube guide and engages the integral hollow cap of the pin to bias it against a rocker member pivotally mounted in the housing. The rocker member has an operator portion extending through an opening in the housing and a pair of oppositely extending arms engaged by the hollow caps so that the pins translate in opposite directions when the rocker member is pivoted.

Abstract: An encoded keyboard switch comprises a plurality of key positions. Each key position has first and second membrane switches associated therewith. The first switch is immediately beneath the key top and the second switch is beneath the first switch. The first membrane switch has first switch contacts which are commonly connected to a first common external conductor. The second switch contacts of the first membrane switch have output conductors extending therefrom to external signal conductors. The second switch contacts are selectively connected to each other by encoding conductors. Each second associated membrane switch has third switch contacts which are commonly connected to a second common external conductor, and fourth switch contacts which are commonly connected to an internal conductor that is commonly connected to the first contacts of the first associated membrane switches of the key positions.

Abstract: A laminate switch assembly or keyboard comprises a tensioned dome switch plate having improved durability which provides tactile feedback to the operator. Each tensioned dome on the switch plate is aligned with an electrical contact area formed on a printed circuit board so that depression of the dome completes an electrical circuit through the aligned contact area. Each tensioned dome is surrounded by a reinforcing collar or band which relieves the stresses normally produced in the transition area between the switch domes and the remaining planar portion of the switch plate.

Abstract: The present invention provides low cost electrical switch assemblies and methods for manufacturing same. The switch assembly comprises an array of resiliently flexible metallic conductors arranged in predetermined circuit pathways on a dielectric carrier panel. A plurality of apertures or cavities are provided at predetermined locations in the carrier panel. The switch contacts comprise a pair of generally L-shaped fingers which are integral extensions of the flexible conductors. The fingers extend from opposite edge surfaces of the carrier panel defining an associated aperture or cavity, to pass one another over or within their associated aperture or cavity, with the free ends of the fingers terminating adjacent one another.

Abstract: By providing a key actuated tumbler, rotationally journaled in a housing in juxtaposed spaced relationship to a pair of contacts, one of which comprises an elongated resiliently flexible member, with the tumbler incorporating actuating means for controllably moving the flexible contact from its first non-conductive position to its second conductive position, an inexpensive, easily manufactured and installed electric, key-controlled switch lock is achieved. In the preferred embodiment, the tumbler is mounted in a housing which incorporates a contact holding zone for positioning and maintaining the tumbler and the flexible contact in juxtaposed spaced cooperating relationship with the entire assembly directly mountable to a printed circuit board for initiating and terminating the flow of electric current thereto.

Abstract: A switch for connecting a selected one of a plurality of multi-terminal connectors to a common connector comprises a pivotable printed circuit board having a planar array of parallel conductors on at least one side of the board extending to the edge of the board, and fixed female connectors having elastically deformable contacts selectably engageable with the planar edge contact arrays by pivoting the printed circuit board to the selected female connector position, the compressive spring force of the elastically deformable contacts upon the planar contacts holding the pivotable printed circuit board in engagement with the selected female connector.

Abstract: An assembly for manufacture of a membrane switch includes a composite formed of first and second layers, one substantially thicker than the other, with the composite having a size and shape to form both outer members of a membrane switch when folded back upon itself. Metallic conductors, preferably silver, are formed on the composite prior to folding. A spacer member having spaced openings therein and extending over approximately half of the area of the composite is positioned thereupon. After the composite is folded over the spacer member, laminating heat and pressure are applied to the assembly with the result that a bond is formed between the spacer member and composite and between the layers of the composite.

Abstract: A printed circuit board carrying a keyboard switch is mounted perpendicularly to a switch panel. An actuator having a push button portion extending through an aperture in the panel is pivotally mounted for movement about an axis parallel to both the panel and the circuit board. An operator portion of the actuator extends into contact with the switch so that a force on the push button generally parallel to the circuit board effects switch operation in a direction perpendicular to the circuit board.

Abstract: This invention relates to a method of fabricating a membrane switch of the type having a substrate, a flexible membrane, electrical conductors formed on the membrane and substrate, and an intervening spacer between the sets of conductors. The conductors include a plurality of switch sites which are in facing relation to define a specific switch. The spacer means comprises a plurality of individual spacer areas which are located remote from the switch sites. The manufacturing method uses a multiple pass screen printing operation. During the first pass a set of conductors is formed from conductive ink on either the membrane or substrate. Also, during the first screening pass a first layer of the spacer areas is formed from the same conductive material as the set of conductors. On subsequent screening passes additional layers are deposited on the spacer areas to build up the thickness of the areas so that the spacer thickness is greater than that of the conductors.

Abstract: Disclosed is a coding switch comprising at least two conductor paths each having a plurality of contact points disposed on a circuit board about at least a portion of a circle, the circles about at least a portion of which the contact points of the respective paths are disposed being coaxial, and a wiper having at least two spaced and electrically connected contact points secured to the circuit board to rotate about the center of the coaxial circles so that each contact point of the wiper can come into electrical contact with the contact points of a respective conductor path. The wiper is preferably provided with a handle at an end thereof outwardly of the center of the coaxial circles for manually rotating the wiper. The wiper can be set without setting apparatus such as setting rings and the like and the handle can be moved, even from a distance, by a pencil, for example.

Abstract: An electrical component attachment for securing discrete components to a rigid circuit board without the use of plated-through holes. A unitary sheet member has a membrane portion and a flap portion. The membrane portion lies on one side of the circuit board. The flap portion wraps around an edge of the circuit board and is adhesively secured to the other side of the board. An electrical component is disposed between the flap portion and the board so as to be secured thereto by the flap portion. The sheet has conductive traces which contact the leads of the electrical component, providing electrical connection thereto. The sheet may have a tail onto which the traces extend for connection to external circuitry.

Abstract: A flexible membrane switch having a thin insulating layer with a plurality of small apertures interposed between two sets of conductors which cross at each aperture. A person's fingertip pressed upon the switch closes the contacts at plural apertures. Spurious contacting is prevented. An alternate has an additional interposed insulating layer except at those areas where fingertip pressure is to be applied. Larger area switches may be palm, fist or foot operated.

Abstract: A pivoted-actuator switch having two subassemblies snap-in mounted together. An operator subassembly includes an operating member which may be a toggle lever (24) or a rocker button (32), and LED indicator lamp (22, 34) mounted in a hole in the operating member, a double-sided PC board inserted into notches (24d, 24e) or a notch (32b) in the opening member and connected to the leads (22a, 34a) of the LED, and an actuator (16) snap-in mounted to the operating member to retain the PC board therein with its lower portion extending down through the actuator. A housing subassembly includes an insulating base 2 supporting sets of stationary switch contact-terminals (4, 6) and LED contact-terminals (8, 10), and movable contacts (12) therein, switch mounting clips (40) on opposite ends of the base for snap-in mounting the switch in a hole in a mounting panel, and a bezel (42) snap-in secured to the upper rim of the base.

Abstract: A mechanically actuable switch having associated electronic circuitry contained within the switch housing, including circuitry operative to selectively provide momentary, alternate action, and multistation switching modes. Included within the switch housing are a voltage/current regulator, initializing logic, contact debounce logic, mode control circuitry, output buffers, an LED driver and an LED. The switch contact is typically a preformed wire spring configured to be pivoted about a central point from one state of actuation to another. The switch is operable over a wide operating voltage range, typically 3 to 18 volts.

Abstract: A switch mechanism useful in a calculator type keyboard includes a printed circuit board conductor in which is punched a crater-like depression with a raised edge portion and a dome-like member positioned so that its apex may contact the raised edge portion when the switch mechanism is depressed. The punched crater-like depression is specifically formed by striking the printed circuit board conductor to form an edge extending above the predetermined height of the conductor surface, which in turn, is disposed above the planar surface of the dielectric substrate.

Abstract: A capacitance switch in which a capacitance spacing element is bent around an end of a spacer centrally relieved for strain relief.

Abstract: A capacitance-type switch in which an integral capacitance spacer layer element extends over and is severally movable toward and away from separate contact elements of separate switches.

Abstract: A pushbutton switch has a plurality of pushbuttons and corresponding switch contacts. The switch contacts are formed conductive patterns printed on an insulation plate or sheet and are in contact with a pressure conductive rubber sheet. The pressure conductive rubber sheet includes conductive powder and is rendered conductive when compressed by the pushbutton, so that the corresponding switch contacts are closed by the conductive rubber sheet. A plurality of pairs of switch contacts are connected to terminals which are arranged in an adjacent relation.

Abstract: A capacitance-type membrane switch is provided in which it is practical to seal the switch against dust and fluid.

Abstract: A contact switch assembly and method for its manufacture utilizing a resilient dome having electrically conductive surfaces which is positioned on a unitary sheet of plastic or membrane which has a circuit pattern deposited thereon, the circuit pattern forming the contact and contactor means of the switch. In assembly, said membrane is folded upon itself so that the contact and contactor are positioned in a spaced-apart alignment, separated by the resilient dome, whereby upon depression of said dome, electrical contact is established between the contact and contactor through the electrically conductive surfaces of the dome.

Abstract: A patch or access module usable with an insertable patch plug having a plurality of electrical contact elements. The patch or access module includes a circuit board, a first electrical circuit electrically connected with a first point on the circuit board, a second electrical circuit electrically connected with the second point on the circuit board and switch contact means for selectively making electrical connection between the first point and the second point and for making electrical connection between the first point and the electrical contact elements of the patch plug upon insertion of the patch plug into the patch or access module.

Abstract: This is an electrical switch mechanism actuated by a piano-style key of a musical instrument. The switch consists of a pair of cross-bar contacts, at least one of which is resiliently flexible. This resilience permits a moveable contact member to be driven into engagement with a fixed contact member, and also keeps it firmly biased against the fixed contact member for electrical communication therewith whenever the key is in its actuated position. When the key is released, an actuator member on the key captures the moveable contact and moves it away from the fixed contact. Upon actuation, the key over-travels beyond the point of contact engagement, but the actuator decouples from the contact so as to avoid any increase in contact pressure and prevent double-keying. Various techniques for minimizing impact noise during contact recapture, and for mounting the contacts upon a circuit board, are also disclosed.

Abstract: A membrane switch device is described which is composed of two membrane switch arrays which are in parallel closely spaced relationship. A first or original array of membrane switches is provided on a sheet of flexible insulating film which has been folded about a medial fold line so that the switch electrodes on the two opposed surfaces are in alignment. The electrodes have conductors extending therefrom which extend onto a tail. A second array is provided on an extension of the sheet of insulating film and this extension also is folded about its own medial fold line. Additional electrodes and conductors are provided on the extension. A slit is formed between the original section of film and the additional section and the tail is inserted through this slit when the first array is produced by folding the first or original section of film.

Abstract: A switch mechanism for use in an electronic toy having a printed circuit board, a portion of which has a pattern of printed wiring with contacts thereon. A body of conductive resilient material, disposed in the housing of the toy with the printed circuit board, has a base portion with an opening therein. Part of the base is a bridge across the opening, having a push button and a web flexurably connecting the push button to the base. The body is disposed in juxtaposition with the board portion over the contacts with the push button extending through an opening in the housing to present an end of the button which, when depressed, causes a connection to be made between the board contacts through the conductive material of the body for operating the electronic circuits of the toy. A plurality of push buttons may similarly be disposed as part of individual bridges on the base for operating different circuits of the toy when depressed.

Abstract: A flexible data entry keyboard is disclosed which is formed using a flexible substrate having conducting stripes and switch points thereon. The flexible substrate may be folded back on itself such that the switch points are facing one another in opposed complementary relation. An insulating substrate is positioned between the substrates and has a plurality of apertures in alignment with said switch points. To provide a long travel and high tactile feedback characteristic, an elastometer substrate is positioned over the top of said flexible substrate and has domes thereon which overlay each of said switch points. The domes have actuation surfaces on their underneath side such that when a force is applied to the dome, the dome is compressed and deformed against the switch points and the actuation surface ensures that a reliable and consistent contact is made.

Abstract: A push-button panel assembly including an individually lighted push-button switch assembly constructed to be damage resistant and having a long life. The panel assembly utilizes the outer shell as the main structural member and mounts the push-button assemblies and a printed circuit board switching system in precise alignment. The push-button switch assemblies are individually illuminated or edge lighted and permit front relamping of the individually lighted switch. The push-button switch assembly coacts with a precision constructed moisture sealed snap disk system on a printed circuit board for closing a circuit in response to the actuation of the push-button.

Abstract: The present invention relates to a single piece, stamped and formed electrical switch assembly which is intended to be mounted on a printed circuit board. More particularly, the switch assembly comprises a U-shaped member with one arm comprising an elongated cantilever spring blade and the other arm having means for mounting, and a detachable contact post attached to the one arm by a break-away strap. Additionally, means are included for holding the spring blade in a stationary open position during shipping, handling, mounting, and cleaning of the assembly.

Abstract: The invention provides a novel key-board switch unit comprising a printed circuit board having fixed contact points and fixed terminals formed thereon and a covering sheet member having patch-like flexible contacting sheet members bonded on the lower surface thereof and fastened together by means of screw bolts or the like means with a spacer sheet having openings sandwiched therebetween, each of the flexible contacting sheet members being large enough to cover at least one fixed contact point and at least one fixed terminal. Different from conventional ones, the inventive switch unit is assembled together by fastening with screw bolts penetrating the fixed terminals on the printed circuit board so that most reliable electric connection is obtained across the opening in the spacer sheet between the fixed terminal and the flexible contacting sheet member on the covering sheet member which also serves as a movable contact point with the fixed contact point on the printed circuit board.

Abstract: A switch using one or more flexible circuit members provides for rolling contact between circuit members. One circuit member is attached to and wraps round a roller, and the other circuit member, which may be flexible or rigid is supported so that as the roller rotates it rolls, the circuit member attached to the roller changing its contact position with the other circuit member. Conductive patterns on the circuit members are moved into contact and out of contact with each other and can provide varying forms of switching arrangements, for example, normally made to break, normally broken to make, and transfer. Electronic devices can be mounted on either or both circuit members.

Abstract: A resilient platelike spring contact member is disclosed of the type which is mounted on a circuit board in covering relationship to a first conductor and in electrical contact with a second conductor so that the platelike member can be flexed into engagement with the first conductor to establish a circuit path to the second conductor. The platelike member has a pair of legs extending therefrom which extend into holes in the circuit board and each leg has a laterally extending spring contact portion which bears against a second conductor on the circuit board. The legs are shaped such that when the contact member is assembled to the board, the legs are deformed and the contact member is secured on the board without solder or other bonding material.

Abstract: A momentary contact actuator and identification cap assembly disposed to be used with a single switch of a laminated flat-panel keyboard. The assembly consists of a clear cap component which snaps over a flat-panel switch, an identification insert, and a tension bar including spring arms situated within the interior of the clear cap. The spring arms hold the assembly suspended over the associated flat-panel switch. Manual pressure applied to the clear cap deflects the assembly operating the flat-panel switch.

Abstract: In the illustrative embodiments disclosed, one or more independent current paths are provided in a gas spring by use of printed circuit-type conductors. The printed conductor or conductors are preferably formed on a strip of insulating material using known printed circuit techniques, and the strip is then affixed to the cylinder member of the gas spring by an adhesive or, alternatively, by a heat-shrunken surrounding, plastic tube. A current path may be connected to provide a switch function or to establish a closed circuit over a substantial portion of or the entire stroke of the piston rod member. Where plural current paths are provided, the different paths can be given different functions.

Abstract: A key switch for data-entry keyboards and the like, the switch having a housing supporting a snap-action spring with a movable contact positioned adjacent a fixed contact on the housing. An actuator leaf spring is anchored at one end to the housing, and has a free end which is movable to drive the snap-action spring between first and second bi-stable positions to operate the switch. A keystem is slidably supported in the housing, and has a portion in contact with the actuator spring so depression of the keystem displaces the actuator spring to drive the snap-action spring.

Abstract: A slide switch intended for mounting on a circuit board to switch terminal pads on the board comprises a channel-shaped sheet metal switch housing, an insulating slide member captured between the sidewalls of the housing, and switch contact members mounted on the outwardly facing surface of the slide member. When the switch is mounted on the circuit board, the switch contact members contact the terminal pads on the circuit board. Retaining means and detent means for the slide member are formed from the sidewalls of the sheet metal housing. Switches can be produced in strip form with the switch housings integral with, and extending laterally from, a continuous carrier strip.

Abstract: A contact switch assembly and method for its manufacture utilizing a resilient dome having electrically conductive surfaces which is positioned on a unitary sheet of plastic or membrane which has a circuit pattern deposited thereon, said circuit pattern forming the contact and contactor means of said switch. In assembly, said membrane is folded upon itself so that the contact and contactor means are positioned in a spaced-apart alignment, separated by said resilient dome, whereby upon depression of said dome, electrical contact is established between said contact and contactor means through the electrically conductive surfaces of said dome.

Abstract: A switching device comprises a flexible film of insulative material on which is printed a pictorial diagram or the like illustrating a plurality of controlled devices. A plurality of first conductive elements is arranged on a plane in contact with the illustration film and a plurality of second conductive elements is arranged on a second plane spaced from the first plane. In response to a pressure manually applied to the illustration film at a point corresponding to a desired controlled device, the first and second elements of the corresponding pair are brought into electrical contact to complete a circuit through a pair of terminals. Preferably, between each pair of corresponding first and second conductive elements is disposed an elastic element having resistance which varies from a non-conductive value to a conductive value in response to a pressure applied thereto.

Abstract: A tactile snap-action element for use in keyboards, the element comprising an arcuately shaped invertible first dome and a second dome shaped actuating protrusion extending from the invertible second dome, the actuating dome protrusion being integral with the invertible dome and being non-invertible. The element is operated by an actuation force which acts directly or indirectly through the non-inverting second dome to invert the first dome and to provide tactile feedback. The keyboard includes a plurality of keys, each key comprising an element, a conductive circuit associated with the first dome and movable with the inversion of the first dome to electrically contact a second conductive circuit associated with the element.

Abstract: A membrane switch construction and method for making same. A plate of relatively rigid, flat material is coated with an insulative cover and electrical conductors are formed thereon. A membrane of flexible, plastic material with conductors formed on the underside thereof overlies the plate. A non-conductive spacing means interposed between the conductors has holes in register with the conductors. The spacing means normally holds the conductors in spaced, non-contacting relation. The conductors are movable through the holes in the spacing means in response to pressure on the exterior of the membrane. One or the other or both of the sets of conductors may comprise two tiers of conductors separated by an isolation layer of non-conductive material. Holes are appropriately positioned in the isolation layer to permit access to the buried tier of conductors.

Abstract: A keyboard switch assembly including a printed circuit board having four switch terminals on one side of the board, three of the terminals being arranged in a triangle and the fourth disposed within the triangle. Conductors on the one side of the board are respectively joined to the interior terminal and at least one of the three terminals. A conductive, generally triangular, snap-acting dome switch member is provided having arcuate apices, projections being respectively formed from the apices and respectively engaging the three terminals thereby spacing the periphery of the switch element from the one surface of the printed circuit board and the conductors thereon, at least the conductor connected to the interior terminal extending under the dome.