Abstract: A structure for contact points of a shift switch used in a computer. The structure includes an elastic contact plate disposed under the shift switch and having projecting contact points to contact the corresponding conductive contact portions of the circuit board. A sloped slot is formed between adjacent contact portions to separate the contact portions from each other and to avoid detachment and scattering of the conductive material of the contact portions. The contact points are designed with an elongated shape so as to provide a smooth sliding motion of the contact points through the sloped slots.

Abstract: A switch is provided which is simple in constitution and can be efficiently mounted on a circuit board, and a method of efficiently mounting the switch on the board is also provided. In particular, a switch device comprises a circuit board including a conductor pattern; a fixed contact member provided on a land portion of the conductor pattern; a movable contact member movable to touch/detach with the fixed contact member; a casing for receiving the movable and fixed contact members; locking member for fitting the casing to the circuit board, the locking member being provided in the casing; a holding member for holding the movable contact member with respect to the fixed contact member in one of the touched and detached condition, the holding member being provided in the casing.

Abstract: With push button operated switches having at least one movable and one stationary contact carrier, problems may occur when the push button is not actuated properly and centrally. This problem is overcome by a switch having corresponding annular contacts and concentric guide means.

Abstract: A sealed contact unit that attains stabilized contact switching operation and effective dimensional minimization with an arrangement wherein a switching contact section including opposing movable and stationary contacting members is housed within a sealed container together with an electrically insulating gas, a movable shaft interlocked to the movable contacting member is hermetically passed through a wall of the container to be axially shiftable with an end projected externally while the movable contacting member biased away from the stationary contacting member by a resetting spring is mounted through a contact-pressure spring to the other end of the movable shaft inside the container, the contact-pressure spring being provided to coaxially enclose the movable shaft and biasing the movable contacting member against the biasing force of the resetting spring for attaining a contact-pressure when the movable contact member shifts to engage the stationary contact member fixed inside the container, a driving se

Abstract: Disposed before and behind stationary contacts 6U and 6L are one pair each of roller contacts 5FM and 5FH, and 5BM and 5BH which are supported collectively at the upper and lower ends thereof by bridge links 4FU and 4FL, and 4BU and 4BL. These paired upper and lower bridge links are then supported by either of support shafts 3F and 3B respectively. The support shafts 3F and 3B for these two pairs of roller contacts and bridge links are supported by a pair of guide shafts 2U and 2L. The guide shafts are loosely engaged with a drive arm 1 and contacting pressure springs 7U and 7L are fitted between the two support shafts.

Abstract: An electrical switch (1) is proposed on the actuator (4) of which, which can be moved in a housing (2), there are arranged contact bridges (8) which can be brought into contact with break contact surfaces (11) which are located, in turn, in a base (5) secured to the housing (2). Two guide curves (14, 15), which have different configurations and in which a pin (19, 20) respectively engages, are located on two mutually opposite surfaces of the actuator (4) which extend parallel to the direction of actuation. The two pins (19, 20) serving the purpose of the notching are coupled to one another by means of a connecting element (21) which is elastically deformed in sections during the movement by the different guidance of the two pins (19, 20).

Abstract: A switching assembly of individually backlighted rocker actuated switches mounted in a common housing. The switch is built up by mounting connector terminals on a base, securing with an insulated anchor plate and stacking thereon an upper and lower bus, each formed of a conductive strip with plastic molded thereover. Each bus has cut-outs with portions of the conductor exposed therein and with mounting stanchions which bayonet through slots in the lower bus, and each stanchion has a switch blade staked onto it. The stationary contacts on the upper and lower bus are arranged in spaced stacked pairs with a blade mounted contact extending between each pair of stationary contacts. The upper and lower buses each have a terminal formed integrally and extending internally for bayonet contact with terminals on the base. The individual rocker actuators are mounted on the cover, which is snap-locked over the assembly of the base, busses and switches.

Abstract: A control switch for controlling the coiling and uncoiling of an electric winch cable has a push button installed on a top cover of the switch. Both sides of the push button have a retaining pin, and its bottom is an appropriate V-shaped surface. Both edges of the V-shaped surface have a conducting plate. The conducting plates to a dc voltage source on the bottom cover of the switch are arranged to cross each other, with a lateral contacting plate in between. The top of the contacting plate has a supporting post at each end, and the bottom has two retaining posts such that the push button is snug with the retaining pins and the supporting post of the contacting plate. The conducting plates for motor wiring are arranged in parallel on both sides of the conducting plates for the dc voltage source. With such a configuration, pressing the push button to the left or the right changes the polarity of the dc voltage source so as to control the winch cable to coil or uncoil.

Abstract: In a preferred embodiment, a snap switch which employs a conical contact mounted at the free end of a spring blade. The contact completes an electrical circuit by contacting and electrically joining two, round, spaced apart terminals. The resulting dual radii contact provides high unit pressure and a minimum of polymer-forming wiping action. The switch introduces little resistance into the electrical circuit, since the spring blade carries no current. The terminal wires are of nickel with sleeves of oxidized nickel bonded thereto in the region where the wires pass through the base of the switch. The oxide provides a tenacious surface for the adherence thereto of sealing glass to insulatively bond the wires to the base.

Abstract: A switch is provided with a moveable contact and contact carrier that significantly facilitates the manufacturing process necessary to make the assembly. The contact carrier is provided with first and second extensions that are generally flexible and associated with each other to provide a gap therebetween. In the preferred embodiment of the present invention, the second extension comprises first and second fingers that extend from the contact carrier. The second extension is provided with protuberances that permit a moveable contact to deform the second extension as it is moved inward toward the contact carrier. The extensions snap together after the complete moveable contact has moved into a predetermined space between the extensions.

Abstract: An electrical operating device, particularly a change-over or other switch or the like, including a contact-holding slider having a body provided with usual recesses which open into two opposing faces (A, B) of the body, and contain usual contact elements (40) which move against elastic springs (26, 26A) to cooperate with usual fixed contacts rigid with the body of the operating device, the body of the slider comprising at least two parts (2, 3) fitted together by connection devices (4, 4', 5, 5', 6, 6', 7, 7').

Abstract: An electrical switch and switch contact are disclosed, both of which are advantageous for use in an environment containing explosive gases or vapors. The switch housing is designed so that the two joints where explosive gases or vapors can enter or exit into the switch interior can cool any hot gases escaping from the switch interior. Therefore, if any explosive gases or vapors are ignited by an arc in the switch interior, they are cooled during their exit from the switch, so that they cannot ignite the explosive environment outside the switch. This is done using a labyrinthine path between the two switch housing members, and a lengthy metal-to-metal, metal-to-ceramic, or ceramic-to-ceramic path between the switch actuator and the switch housing. The contact is designed such that it has a greater flexural length, without requiring a substantial increase in the housing body volume. This allows a smaller amount of hazardous gas or vapor to come into contact with a potential arc.

Abstract: A switch is described that includes a plunger (20, FIG. 1 ) moveable between up and down position and having upper contacts (22, 24) and lower contacts (26, 28). When the plunger is moved to a down position, opposite ends of the upper contact (22) move down against first and second terminals (12, 14) to interconnect them. When the plunger is moved to an up position, opposite ends of the lower contact (26) move up against the first terminal (12) and a third terminal (16) to interconnect them. The plunger can move within a hole in a circuit board and carry two upper and two lower contacts to connect four terminals in two different ways. Each terminal can include upper and lower terminal pads (120, 122, FIG. 5 ) lying respectively on upper and lower surfaces of the circuit board and interconnected through plated-through holes (124) in the board.

Abstract: A contact device includes a housing, a fixed contact, and a moving contact attached to a support frame, the support frame and moving contact movable within the housing perpendicular to the fixed contact. A stopping arm projects from the support frame to restrict movement of the support frame within the housing.

Abstract: A contact arrangement for an electromagnetic switching apparatus having parallel offset contact bridges which are held in windows of a contact bridge carrier. These contact bridges are prevented from shifting transversely to the direction of force of a contact pressure spring pushing against a spring cup. The contact bridges are connectable to fixed contact parts. The spring cup is adapted to the offset of the contact bridges and has a separating rib for the contact bridges which extends between the two parallel contact bridges, so that mutual contact of the contact bridges with each other is impossible if diagonally opposite contact parts are welded together when the contacts are opened.

Abstract: In accordance with the present invention, there is provided an electric reversing switch comprising an insulated base having an elongated cavity defined therein. An elongated insulation member is provided for oscillatory motion about an axis through the cavity through an angular interval between a first and second position. Conductive bridging elements are provided on the ends of the insulation member and biased outwardly from the insulation member along the axis thereof. A first pair comprising first and second fixed contacts is supported in the base, each including a contact portion within the cavity and being symmetrical disposed relative to the axis through the cavity.

Abstract: An electric relay is provided with pairs of stationary electrical contacts for connection to an electric circuit, movable bus bars positioned at axially spaced locations along an actuating shaft, and a mechanism for moving the shaft in an axial direction between first and second positions. Compressible biasing assemblies are positioned along the shaft between the conductive members and stops are positioned at the axially spaced locations to limit movement of the compressible biasing assemblies. The conductive members have an opening for receiving the stops and are capable of axial displacement with respect to the stops. Movement of the actuating shaft compresses each of the biasing assemblies between one of the stops and one of the conductive members thereby providing an axial force to press the conductive members against a pair of stationary contacts.

Abstract: A electrical switching apparatus having a housing, an actuator for actuating the apparatus along an axis, first contacts for establishing an incomplete electrical path within the housing and second contacts for bridgingly electrically completing the electrical path in response to movement of the actuator within the housing. The first contacts comprise at least two elongate contacts and the second contacts comprise at least one elongate bridging contact or in a generally perpendicular to the axis of the housing. Second contacts are floatingly captive to the actuator in a manner allowing movement of those second contacts with respect to the first contacts in at least one axis.

Abstract: A switch assembly for a geared limit switch for valve actuators is formed from aligned switch modules. The switch modules includes a pair of switch units, each switch unit having a plunger and a movable contact plate mounted between two springs. As the plunger is driven inward, a camming element on the plunger contacts an edge of an aperture in the movable contact plate, forcing the plate to move in a direction perpendicular to the line of plunger travel. The inward motion of the plunger and the camming action continue after the contacts have closed, wiping the contacts mounted on the movable plate across the surfaces of the stationary contacts. When the plunger is released, an outer edge of the movable plate engages a beveled inner wall of the switch unit housing, returning the movable contact plate to its original position.

Abstract: A compact universal switch with integral contact tabs which includes a housing, an axially slidable connecting bar for movement in an axial direction and a pair of spaced-apart L-shaped contact tabs fixed to the housing such that the axially slidable connecting bar is movable between the contact tabs, the contact tabs each comprising a deformable metallic electrically conductive plate having a leg portion and a foot portion having a contact thereon. An axial bar actuation device is fixed to the housing for moving the axially slidable connecting bar in the axial direction and a connection bridge is provided for completing interrupting an electric circuit between the contact tabs in response to movement of the axially slidable connection bar. A tab-contact insulating case is fixed to the housing and at least partially covers the contact tabs.

Abstract: A switch having a carriage with a pair of substantially opposite sides and a contact surface of conductive parts facing one of the sides and a reaction surface facing the other of the sides in spaced relation therewith, and wherein the carriage is movable relative to and substantially parallel with the contact surface and the reaction surface, and has an improved contact mechanism carried by the carriage. The carriage has plural openings extending therethrough perpendicular to the contact surface and the reaction surface. The contact mechanism comprises a respective plurality of plungers, springs, conductive contact members and a common conductive retainer. Each contact member is slidably disposed in a respective one of the carriage openings and is adapted for engagement with the contact surface. Each spring is interposed in compression between a respective contact member and a respective plunger.

Abstract: A thimble-shaped button actuator largely formed of insulating material has a cup-like base with an inside step and is symmetrical about an axis. A thimble is reciprocable in the base along the axis. A spring is seated against the closed end of the base and the closed end of the thimble and urges the thimble in a direction away from the base and against a snap ring in the base in the path of a flange on the thimble. An electrically conducting ring on the thimble is moved by axial pressure on the thimble to abut a pair of electrical conductors seated in the base and overlying the step. Electrically conducting binding screws are recessed in and pass into the base to engage threads in the conductors.

Abstract: A compact, double-throw double-pole push-button electric switch is comprised of: a base; four electric terminals fixed to the base; a lower spring retainer pivoted on the base; a push-button key slidingly disposed and captively retain within a housing connected to the base; an upper retainer pivotally disposed within the push-button key and carrying a shorting bar between the opposing pairs of terminals; a coil compression spring captively retained at one end by the lower spring retainer and captively retained at its opposing end by the upper spring retainer; and a pair of double lobe cams connected to the lower spring. As the push-button is depressed, the camming surface within the push-button key comes into sliding contact with one of the two lobes of each of the cams. The cams rotate on the base and bring a fixed lever arm extending from the cam into contact with the shorting bar.

Abstract: A contact arrangement for switchgear with multiple disconnects by contact points connected in parallel of two contact bridges aligned in a contact actuation link uses a spring collar for a contact pressure spring. The spring collar has cutouts transverse to the spring-action direction into which the contact bridges with the spring collars can be inserted and locked in place transverse to their longitudinal direction. The spring collar is rounded at two facing sliding surfaces in the contact actuation link aligned transverse to the longitudinal direction of the contact bridges. This assures optimal fitting of the contact bridges to the fixed contact components without jamming the spring collar in the alignment.

Abstract: A switch assembly includes an insulator base with two stationary contacts mounted on that base. A molded insulated tower and insulated post are unitary with the base and form a guide means and anchor means for a movable contact blade which has two movable contacts to engage the two stationary contacts. The tower has a unitary cap with a surface facing the base and a raised fulcrum on this facing surface. An actuator lever pivots on this raised fulcrum and moves the movable contact blade toward engagement of the pairs of contacts and establishes an over-travel means for the actuator lever after the contacts are in engagement.

Abstract: A switch gear which includes a housing have first and second sides and a third side therebetween, at least one main contact bridge in the housing displaceable between two ON-OFF switch position, a spindle rotatable by a handle and carrying a body having a cam slot receiving a cam follower of a contact bridge holder, the contact bridge holder carrying contacts for effecting the two switch positions with associated pairs of fixed contact rails carried by the housing, the fixed contact rails being connectable by connector screws to electrical hook-up leads at the respective first and second housing sides, first and second separate housing compartments adjacent the first and second housing sides and carried associated ones of the connector screws, the first and second contact rails being connected through the respective first and second separate housing compartments for connection to the electrical hook-up leads by the connector screws, and the first and second separate housing compartments being selectively moun

Abstract: A contact arrangement for a relay having a high breaking current capacity. A contact spring is split in fork-like fashion so as to form two fork ends at its free end. The contact spring is opposite two cooperating contact elements in the form of a double contact or two contacts to be bridged. The two fork ends of the contact spring are directly connected to one another via a welded on contact strip. A stranded conductor is welded directly to a freely accessible center portion of the contact strip between the two fork ends. Thus, the two contacting locations of the contact spring are connected to one another or to a power terminal in a low-loss fashion without employing an expensive central contact spring having good conductivity. Rather, a spring steel having a relatively poor conductivity may be employed.

Abstract: Compressible metal spring washers are mounted around the shank portions of terminal rivets and are clamped against thin conductor laminae of a flexible printed circuit having a resilient resinous plastic base lamina, clamped by the rivets against a relatively rigid plastic terminal supporting member. Each washer has a central dished portion, a reversely dished peripheral portion, and a smoothly rounded annular bulging portion therebetween for engaging one of the thin conductor laminae, without cutting into the laminae. The spring washers obviate any looseness of the terminal rivets due to dimensional variations, shrinkage with age, and temperature variations.

Abstract: A contactor, relay, or other switch has stationary contacts and a movable crossbar which carries a movable contact member provided with movable contacts. The contact member has lost motion relative to the crossbar and is resiliently biased by a spring so that the crossbar can continue to move after the contacts have met the stationary contacts. The crossbar has oblique guide grooves engaging the contact member so that, during the further movement of the crossbar, the contact member is caused to move longitudinally while the movable and stationary contacts touch, thus producing a contact wiping action due to sliding of the contacts. The contact member also has an asymmetical cross section comprising a projection where, when the contacts are open, it touches the crossbar so that, in this condition, the contact member is laterally tilted.

Abstract: A miniature screw switch assembly is provided with side extending leads that are spaced apart at DIP standard distances. Each segment of the segmented body, which facilitates separation into individual switches, is molded around a pair of opposed, lead contact portions. A socket is provided in the segment between the contact portions for receiving a headed screw forming a bridging member between the two pole forming contact portions. Central portions of the leads extend substantially perpendicular from the body and segment sides and are bent downwardly at right angles to terminate in end portions. The end portions are intended to be inserted in through openings in printed circuit boards or surface-mounted on printed circuit boards. The disclosed assembly facilitates automatic manufacture, carrying to circuit board assembliers and insertion or surface-mounting on circuit boards.

Abstract: A movable contact assembly comprises a movable contact arm carrying a movable contact element, an electrically insulating contact holder for holding the movable contact arm and movable between the open and closed positions, a compression spring for resiliently holding the movable contact arm relative to the contact holder, and a spring retainer disposed between the compression spring and the movable contact arm. The spring retainer has first and second sloped guiding surfaces. The movable contact arm has first and second sloped guided surfaces thereon. The sloped guide surfaces of the spring retainer serve to guide, in cooperation with the sloped guided surfaces of the movable contact arm, the movable contact arm into a predetermined proper positional relationship relative to the movable contact holder due to the spring force of the compression spring.

Abstract: Individual switch actuators are formed by etching offset grooves in opposite sides of a thin metal plate. The groove on one side of the plate falls just within the groove on the other side of the plate. A web is formed between the adjacent groove walls which provides significant localized flexibility. A discrete contact pad is defined on the inside that is in the plane of the metal plate.

Abstract: A double pole switching device has a plunger which is longitudinally movable in a housing against a spring force and has at least one contact bridge provided with a movable contact switch to operate with immovable contacts, and an element is provided for forcibly opening of adhering or welded contacts and includes a U-shaped bracket with a connecting web located between the contact bridge and a contact pressure spring and two legs cooperating with stepped extensions in the housing so that the bracket and the contact bridge over a first part of the stroke of the plunger are forcibly taken along, and the legs of the bracket over a further part of the stroke are spread outwardly and release the plunger.

Abstract: An electric switching device of the type having a contact system includes two stationary contact bars and movable contact bridges for interconnecting the bars. To convert the switching device from a circuit maker to a circuit breaker, or vice versa, a control member is provided in the form of a shiftable slide having insulating projections which in one end position of the slide are displaced between one bridge and a contact bar while the other projection is out of the range of movement of the bridges, and in the other end position the other insulating projection interrupts the contact between the other bridge and the assigned contact bar.

Abstract: A push button electrical switch assembly including an actuator biased for resilient reciprocation between predetermined axial limits within a housing. A cover on the housing includes a push button movable between predetermined axial limits. The push button contacts and is biased by the actuator to one of its predetermined axial limits. First electrical contacts are fixed to the housing, and second electrical contacts are carried by the actuator. The second electrical contacts, when urged to a contact-engaging position with the first electrical contacts, pivot against the same bias which biases the actuator, to provide a contact-wiping engagement with the first electrical contacts.

Abstract: A contactor has a movable contact assembly which is connected to the magnet armature in such a way that the contact assembly moves translatorily in the same direction as the armature between a closed and an open position. The contact assembly comprises a movable main contact with relatively small contact elements of silver alloy and a movable arcing contact with contact elements of silver-free material. The arcing contact makes and breaks the main current, whereas the main contact carries almost the entire current in closed position. The contacts have separate contact pressure springs. The contactor has at least one opening spring which is obliquely directed in relation to the direction of motion of the armature and is clamped between two bearing points, of which one is fixed whereas the other, upon operation of the electric switch, is displaced together with the armature in the same direction of motion.

Abstract: An improvement for retaining wire type contacts of a rotary switch in position upon a stator to facilitate assembly during manufacture. In lieu of previously employed glued or heat sealed construction, the improvement is provided with a resiliently expandable periphery which engages an annular shoulder on the stator element without resort to the use of tools or adhesives.

Abstract: A movable contact bridge (12) is associated with contact carrier (7) by means of a stirrup (28), a pressure spring (25) and a resilient blade (45). The stirrup has two hooks (35, 36) which hold the blade in place and facilitate removal and positioning thereof because of the gap (60) separating these hooks. This contact bridge is advantageously used in contactors of minimum rated power greater than 100 amps.

Abstract: A push-button switch affording a clear click feeling, comprising a contact plate which is curved in one direction and which is formed into a movable contact by providing therein two substantially parallel slits extending in a perimetric direction, forming a movable contact portion between said two slits, and curving both side edges of said contact plate along said slits oppositely to the direction of the curvature of said movable contact portion so as to form normally-contacted contact portion; a switch body which includes first stationary contacts and a second stationary contact; and a push button; said normally-contacted contact portions of said contact plate being normally held in electrical contact with said first stationary contacts of said switch body, while said movable contact portion of said contact plate is depressed and deformed oppositely to the direction of the curvature thereof by said push button, thereby to come into electrical contact with said second stationary contact of said switch body; s

Abstract: A device for tripping thermal relays includes a tilting fork controlled by a pusher which acts on a tension spring which connects a mid point of the fork to a fixed point of the casing of the device. The fork at its free movable end is joined to a contact-bearing sliding bar which is guided longitudinally and transversely. The bar is provided with dual breaker operating contacts which are continusouly biased by a spring to a closed position. The pressure exerted on the contacts is independent of the pressure exerted by the bar in its operative position or assembled with the contacts.

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 circuit breaker having a contact opening and closing mechanism including a contact actuator member which is moved between a first position and a second position to close and open the contacts. The movable contact is mounted on one end of a contact carrier which is pivotally mounted at its central region to the contact actuator member. A leaf spring is positioned between the other end of the contact carrier and the circuit breaker case. When the contact actuator member is in the first position, the leaf spring produces a torque on the contact carrier in one direction about the pivot forcing the contacts closed. When the contact actuator member moves from the first position toward the second, the leaf spring becomes ineffective and a torsion spring which engages the contact carrier and the contact actuator arm produces a torque pivoting the contact carrier in the opposite direction thus enhancing the contact opening process.

Abstract: A mechanically controlled power switch with automatic opening is provided for limiting short circuits. A switch (13), a breaking chamber (30) which is associated therewith, a coil (50), a striker (51) cooperating therewith, and a lock (53) for holding the power switch in open position S after the appearance of a short circuit are placed in a removable cartridge (23) provided with connection terminals (37, 55). This switch cartridge is advantageously used in mechanically controlled protection apparatus or in electromagnetic contactor apparatus having their own protection.

Abstract: A contact arrangement for electric switchgear is disclosed. The contact arrangement comprises a bifurcated offset contact bridge having two contact bridge parts, each of which is inserted into an opening in an actuating contact bridge carrier. Each contact bridge part rests on a first supporting surface of the opening. A spring retainer rests against the contact bridge and a compression spring is mounted between a second surface of the opening and the spring retainer. The spring retainer is guided in the contact bridge carrier against movement transverse to the direction of motion of the carrier. Each end of each contact bridge part is provided with a semicircular contact pad which, when the contact bridge parts are placed adjacent each other, form a bifurcated circular contact pad which engages with corresponding stationary contacts.

Abstract: A multiple contact arrangement for electromagnetic switchgear is disclosed. The contact arrangement comprises a movably guided contact bridge carrier which holds spring-loaded contact bridges in windows open on one side, the contact bridges being offset in the central part. The contact bridges make electrical contact with fixed contacts which are arranged essentially lined-up with the front edge of each contact bridge carrier window as viewed in the direction of motion of the contact bridge carrier. Partitions are attached to the contact bridge carrier which cooperate with switching chamber housing partitions to form enclosures for each of the contacts. The contact bridges are offset in their central part so that make or break contacts can be formed as desired by reversing the orientation of the contact bridges by 180.degree.. The contact arrangement allows a set of break contacts to be placed between two sets of make contacts.

Abstract: Electrically powered apparatus is provided with a remote primary control station from which energization of the apparatus is usually controlled, and a secondary control station, such as a jog control station, which is remote from the primary control station and close to the apparatus, from which energization of the apparatus may also be controlled. A single manual push button start control module may be mounted at either station, so that when the module is at the secondary station there is no start button at the primary station. A holding circuit provides for extended energization of the apparatus when the push button is momentarily depressed at the primary station, and there is a stop button at the primary station; while the secondary station has no holding circuit. The holding circuit is disabled when the module is mounted at the secondary station, so the apparatus cannot be energized by mounting a second identical start control module at the primary station.

Abstract: An electromagnetic switchgear has a set of main and leading switches in a housing for adding series damping resistors to legs of a network which feeds a capacitive load. Plural switch sets are arranged side by side with associated main and leading switches positioned one over the other in two stories. Electrical bridges which extend over the two stories connect the input leads of the switches of a set. Similarly, a damping resistor is connected between the output leads of the switches of a set, and the resistors are mounted so that they lie, protected against external influences, between separation ribs on the switchgear housing.

Abstract: This actuator switch assembly is used in conjunction with a concrete block machine and provides first and second switch portions, each attached to one of the height pins of the concrete block machine. Both switch portions include spring-loaded plungers and one of the portions includes a pair of electrical contacts which are closed by engagement of the plungers when the height bars approach each other.

Abstract: A bridging contact structure, suitable for use in AC contactors and the like, is provided with double-break stationary main contacts, and with double-break stationary arcing contacts in parallel with the main contacts. Silver usage in the main contacts is substantially reduced.

Abstract: A contactor, relay, or other switch has stationary contacts and a movable crossbar which carries a movable contact member provided with movable contacts. The contact member has lost motion relative to the crossbar and is resiliently biased by a spring so that the crossbar can continue to move after the contacts have met the stationary contacts. The crossbar has oblique guide grooves engaging the contact member so that, during the further movement of the crossbar, the contact member is caused to move longitudinally while the movable and stationary contacts touch, thus producing a contact wiping action due to sliding of the contacts. The contact member also has an asymmetical cross section comprising a projection where, when the contacts are open, it touches the crossbar so that, in this condition, the contact member is laterally tilted.