Abstract: A keyboard structure and assembling method thereof are provided. The keyboard structure includes a baseplate, a keycap and a frame having a hook body. The keycap can be inserted into the frame and restricted by the hook body, so that the range of movement of the keycap is restricted. The keycap cannot be separated from the frame so that the coupling of the frame and the baseplate is not interfered by the keycap. Thus, the present invention can effectively simplify the assembling process of the keyboard.

Abstract: A keyswitch includes a cap, internal and external sleeves, a resilient arm, a base having a pillar, and an elastic member abutting against the internal sleeve and the base. The internal sleeve jackets the pillar, abuts against the cap and has a first outer annular surface with a transverse slot. The external sleeve jackets the internal sleeve and has a protruding block movably inserted into the transverse slot for guiding the external sleeve to rotate and a second outer annular surface having concave and convex portions and an arc-shaped bar. When the resilient arm abuts against a second position on the convex portion and the cap presses the external sleeve, the resilient arm crosses the arc-shaped bar. When the resilient arm abuts against a first position on the convex portion and the cap presses the external sleeve, the resilient arm does not need to cross the arc-shaped bar.

Abstract: There is provided a contact switching device which has high productivity and in which operation characteristics hardly vary. The contact switching device includes an electromagnetic unit, a holder, a movable shaft, a movable yoke, a movable contact piece having movable contacts at both ends, fixed contacts, and a fixed yoke. At the time of excitation of the electromagnetic unit, the movable shaft moves to the holder side along a direction of an axis center. A magnetic circuit is formed of the fixed yoke and the movable yoke due to a magnetic field generated by a current that flows into the movable contact piece as a result of the movable contacts coming into contact with the fixed contacts. The movable yoke is then attracted to the fixed yoke.

Abstract: A contact apparatus is provided and includes fixed terminals having fixed contacts, a movable contact member having the movable contacts provided on one surface thereof so as to come into contact or out of contact with the fixed contacts, a first yoke arranged at one side of said one surface of the movable contact member, and a second yoke arranged at a side of the other surface of the movable contact member, the second yoke having one surface facing the first yoke through the movable contact member. The first yoke is larger in volume than the second yoke.

Abstract: A circuit breaker has a stationary contact and a movable contact, and an actuator device for actuating it comprises a rigid drive shaft (8) that drives the movable contact, first resilient means for driving the movable contact, and a torsion bar (2) for driving the drive shaft, the torsion bar (2) being suitable for being deformed in twisting in order to assist the resilient means during an initial period while opening the contacts of the circuit breaker. The torsion bar (2) is housed inside the drive shaft (8). A first end (4) of the torsion bar (2) is constrained to turn with a ring (10). A second end (6) of the torsion bar (2) is constrained to turn with the drive shaft (8).

Abstract: A contact retention assembly is for electrically connecting an electrical apparatus to an electrical bus member. The contact retention assembly includes a bus stab, a spring member and a terminal contact. The bus stab includes first and second opposing sides, and at least one protrusion extending outwardly from a corresponding one of the first side and second sides. The spring member includes first and second opposing legs, an intermediate portion, and a number of openings. The terminal contact is electrically connected to the electrical apparatus, and is disposed between the bus stab and the spring member. The first and second legs of the spring member are biased toward one another to mechanically couple and electrically connect the terminal contact to the bus stab. The protrusion is disposed in a corresponding one of the openings of the spring member to retain the spring member on the bus stab.

Abstract: Methods and apparatus for a touchsurface assembly such as a key assembly are described. The touchsurface assembly includes a sheet metal component having ramps formed therein and a keycap having ramp contacting features and a touchsurface for receiving a press force that moves the keycap toward a pressed position. The ramp contacting features contact at least one of the ramps in the sheet metal component while the keycap moves toward the pressed position, the ramps guiding the keycap to move in a second direction orthogonal to the press direction as the keycap moves from the unpressed position toward the pressed position.

Abstract: An inline conduit switch includes a body having an anchor fitting adapted for mounting to a support and a conduit fitting adapted for mounting a control cable thereto. The conduit fitting is at least partially received in a bore of the anchor fitting for relative axial movement between a first configuration to which the body is normally biased and a second, compressed configuration. First and second electrical contacts are operatively carried by the anchor fitting and the conduit fitting, and are brought into electrically conductive engagement in the second configuration. The inline conduit switch operates to create electrical contact when a control cable is placed in tension, thereby axially shifting the conduit fitting relative to the anchor fitting.

Abstract: Embodiments provide an electrical contact assembly. The electrical contact assembly includes a crossbar, a pivot pin mounted in the crossbar, a contact arm pivotally mounted on the pivot pin and rotatable about a pivot axis, a moveable electrical contact spaced from the pivot axis in a first arm portion of the contact arm, and a spring assembly coupled between the crossbar and the contact arm, the spring assembly including a clevis pin and a spring received on the clevis pin wherein an end of the clevis pin extends through the spring and is received in a pivot recess in the crossbar. Electrical contact assemblies with offset rod ends and limit stops are also disclosed. Systems including the electrical contact assembly and methods of operating the electrical contact assembly are provided, as are other aspects.

Abstract: A circuit breaker is disclosed, in particular for low voltages, having a switch shaft and a contact lever rotationally mounted and extending transverse to the longitudinal axis of the switch shaft and protruding out of the switch shaft, the shaft carrying a movable contact on a side of the outer contour of the contact piece, and including a recess on the opposite side of the outer contour thereof for suspending a pin having a force applied thereto on both sides of the contact lever by way of one spring each, each applying a torque to the contact lever in the closing direction. The two springs each include a cover element extending along the spring and each disposed between the spring and the arc formed between the contact pieces when the circuit breaker is opened.

Abstract: A movable contact point board provided with contact points is urged in a direction of being away from stationary contact points by return springs each having the same size and the same characteristic, and is arranged as opposed to the stationary contact points. Return springs have the respective ends for supporting locations in the movable contact point board which are away from each other as having the contact points in the movable contact point board therebetween and support heights of the return springs at the stationary side differ with each other by D. When a plunger equipped with a holding portion having a flat surface as a bottom surface presses the movable contact point board, the contact point in the movable contact point board gets in contact with the stationary contact point at an inclined posture.

Abstract: A seat belt buckle fastening detector 40, which detects the existence of seat belt fastening, includes a printed circuit board 41 including a normally-closed contact NC, a normally-opened contact NO, and a common contact COM. A slider 42 electrically connects the normally-closed contact NC and the common contact COM, or the normally-opened contact NO and the common contact COM. The common contact COM is formed on one surface 41 a of the print circuit board 41, and the normally-closed contact NC and the normally-opened contact NO are formed on the other surface 41b of the print circuit board 41.

Abstract: A circuit breaker includes a stationary contact, a plug-on half jaw, and a jaw spring. The plug-on half jaw is electrically coupled to the stationary contact and has a single terminal end for receiving a bus bar. The jaw spring is operatively coupled to the half jaw and has a bridge portion connecting two symmetrical spring legs.

Abstract: An electrical switch element, particularly a relay, is provided with an actuator with a switch contact and a switch mechanism. The switch mechanism translates a driving movement of the actuator into a switching movement of the switch contact so that the switch contact is brought into and out of contact with a mating contact. In order to create a switching movement with a large lift in the case of an actuator which can only execute a driving movement with small lift, the switch mechanism has two swivelling levers connected to each other via the actuator and at least one contact retainer. The contact retainer connects the two swivelling levers in its longitudinal direction with a lever arm larger than the actuator and is configured so it can be deflected transverse to its longitudinal direction.

Abstract: A low profile limit switch utilizes a bowed spring actuator for advancing a bridge contact into and out of contact with a pair of terminal contacts to close and open the switch. The bridge contact is mounted on a glide on an end of the spring and formed from an insulating material. The terminal contacts are spring loaded and maintained in spaced apart and staggered relationship so that only one of the terminal contacts remains in contact with the bridge contact when it is retracted by the bowed spring. A mounting clip including a mounting flange and spaced apart spring loaded arms extending generally perpendicular to the mounting flange is used to mount the switch to a surface proximate an edge without having to obtain any significant amount of vertical clearance above the switch for bolting it to the surface.

Abstract: A switch contact arrangement for a power switch is provided with a device for increasing the contact force acting between switch contacts. The device includes a cavity which is made in a stationary conductive element of the switch contact arrangement in such a manner that the direction of the current in the conductive element adjacent to the stationary switch contact runs essentially perpendicular to the longitudinal direction of the conductive element and therefore essentially parallel to the direction of current in an associated displaceable conductive element. The above-mentioned arrangement is suitable for low-voltage power switches with a selective form, whereby the switch contacts thereof allow a short-circuit current to be guided without premature opening.

Abstract: The invention relates to an electromagnetic relay with an electromagnetic coil for exciting a magnetic field and an iron circuit for guiding the magnetic field, wherein the electromagnetic coil surrounds at least part of the iron circuit and the iron circuit comprises a core, a movable armature and a yoke. The electromagnetic relay further comprises a contact system with a movable contact bridge which can be actuated dependent on the magnetic field. In order to provide an electromagnetic relay that is able to disconnect or connect a plurality of electric contacts simultaneously in a particularly secure and loss reduced manner, according to the present invention there are provided at least three electric contacts on the contact bridge. According to an advantageous embodiment, the contact system comprises three fixed contacts which are corresponding each to one of three phases and the contact bridge forms a star point of the three phases.

Abstract: A switchable shunt has an insulating layer separating conductive lead and spring metal layers. The shunt includes a base region formed on the spring metal layer, one or more arms formed in the conductive lead layer and at least one of the insulating and spring metal layers, one or more pad regions electrically coupled to an arm and formed in at least the conductive lead layer, and one or more gaps. Each arm extends through a gap and is resiliently biased toward a shunted state with the pad region in electrical contact with the base region. The shunt is movable to an electrically open state where the pad and base regions are electrically isolated. A method of making the shunt includes etching the shunt from laminated material and pushing the arm and pad through the gap. The shunt may be operated by applying a force to the arm.

Abstract: A switchable shunt has an insulating layer separating conductive lead and spring metal layers. The shunt includes a base region formed on the spring metal layer, one or more arms formed in the conductive lead layer and at least one of the insulating and spring metal layers, one or more pad regions electrically coupled to an arm and formed in at least the conductive lead layer, and one or more gaps. Each arm extends through a gap and is resiliently biased toward a shunted state with the pad region in electrical contact with the base region. The shunt is movable to an electrically open state where the pad and base regions are electrically isolated. A method of making the shunt includes etching the shunt from laminated material and pushing the arm and pad through the gap. The shunt may be operated by applying a force to the arm.

Abstract: A stab assembly (41) in which a spring clip (24) and a conductor member (16) define a pair of engagement surfaces for engaging a stab blade (12). The conductor member (16) has an opening (34) to allow for the insertion of an extended surface of the spring clip (24). Once in position, the spring clip (24) and conductor member (16) are frictionally engaged and define a channel (126) that will accept and hold a stab blade (12). The stab assembly (14) is retained within a molded case circuit breaker (10) and provides electrical contact between a bus bar and the circuit breaker.

Abstract: A miniature electrical switch that can be mounted on a circuit board, includes a dielectric housing (12) with a forwardly-opening cavity (26), a first contact (16) lying primarily within the cavity, and a second contact (14) lying outside the cavity and engaging the first contact except when the first contact is depressed. The second contact is of largely U-shape, with a middle (64) and lower section (52) in a fixed position and with an upper section (60) that can resiliently bend. The second contact is a thicker plate of sheet metal with a top section (28) that forms the top of the cavity front and which has a front edge (30) which engages a contacting part (66) at the front of the first contact upper section. The second contact is mounted to lie on the outside of the housing.

Abstract: A contact-unit slide for contractors which includes an insulating body in which windows are drilled wherein in each of these windows a contact bridge and a compression spring associated with the contacts are housed, the slide being moved by the mobile parts of the contactor's electromagnet, the spring bearing on the opposite side of the support surface adjacent to the contact bridge. The body has slots extending between a window and a visible surface to allow it to be supported on the upper end of the associated spring.

Abstract: A blade suspension assembly for a circuit breaker comprises a pivot pin, a torsion spring, an elongated blade, and a blade carrier. The torsion spring includes a lateral middle section, a pair of end legs disposed on opposite sides of the middle section, and a lateral hole extending therethrough. The blade includes an electrical contact mounted thereto, a lower bearing surface, and a lateral circular aperture. The blade carrier includes first and second pairs of bearing surfaces. To assemble the blade suspension assembly, the torsion spring is placed over the blade with the lateral middle section abutting the lower bearing surface of the blade, with the end legs disposed on opposite sides of the blade, and with the lateral hole in the torsion spring disposed in line with the circular aperture in the blade. Next, the pivot pin is inserted through the lateral hole in the torsion spring and through the circular aperture in the blade.

Abstract: A device for separating a pair of electric contacts which tend to weld and consist of a stationary contact 11 and a contact 12 which is movable away from the stationary contact, particularly in a circuit breaker is provided. The device includes a tripping lever 17, which is biased in a contact-separating direction and serves to actuate the movable contact 12, and means 19 for holding the tripping lever 17 in its stand-by position. The movement of the tripping lever 17 from its stand-by position involves a displacement of a lever fulcrum to a first position where a strong separating force is exerted on the movable contact 12 and then to a second position where a weaker separating force is exerted on the movable contact 12.

Abstract: A remote battery switch for motor vehicles provides for the remotely controlled disconnection and connection of the vehicle electrical system, for long term storage or carjacking threats. The switch attaches directly to the side terminal or top post connector of a standard motor vehicle battery, without further need for additional structural attachment. A cord or cable is run from the battery switch to the vehicle passenger interior, and is preferably discreetly accessible by the vehicle operator should the need arise. The cord or cable serves to open the switch by releasing a magnetic contact and withdrawing the magnetic switch bar against a spring, whereupon the switch bar is caught and retained by a double acting catch. A second pull on the cord releases the catch, whereupon the spring pulls the magnetic switch bar into magnetic contact with the other switch point to close the circuit. Thus, the switch may be remotely opened and closed using purely tensile forces in the cord.

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: The invention provides a spring exerting a non-linear force between a contact carrier and a contact blade in a circuit interrupter. The inventive spring includes at least one elongated cantilever. The length of the cantilever has the shape of an arch made with a non-uniform angle and is formed from an elastic material. The cantilever is supported at one end against the carrier with the length of the cantilever positioned parallel to the carrier and the opposite end of the cantilever abutting the contact blade so that the carrier supports more of the length of the cantilever as the displacement between the carrier and the contact blade decreases.The invention also includes a method of operating a circuit interrupter by non-uniformly increasing the force exerted against a movable contact as it engages a stationary contact to complete a circuit.

Abstract: The contact bridge of a molded case circuit breaker is rotatably mounted in a bar by two springs arranged symmetrically from the rotation axis. Each spring is, on the one hand, anchored to the contact bridge, and, on the other hand, anchored to a rod housed in a notch of the bar. The same springs provide contact pressure and slowing-down of opening of the contact bridge at the end of repulsion travel by electrodynamic effect. The contact bridge bears on its edge cam surfaces which, at the end of opening travel, engage the anchoring rods to move them in the notches in the elongation direction of the tension springs. The energy of the contact bridge is thus taken up and stored in the springs causing slowing-down of the contact bridge. The profile of the cams can be chosen to enable reclosing of the contact bridge, this reclosing naturally being delayed by the slowing-down effect at the end of travel. The cam profile can also ensure latching of the contact bridge in the open position.

Abstract: Disclosed is a push button switch assembly which is used in the operation panel of an electronic equipment or in the input device of an office automation apparatus. The assembly comprises a pair of upper and lower contacts, a slider body for pressing said contacts, a button for pressing said slider body, protrusions provided on respective opposing surfaces of the button and the slider body respectively, a coil spring disposed between the button and the slider body and arranged such that is end portions are forced onto and retained on the protrusions respectively, and a casing for retaining the button in a manner such that the button is vertically movable. By providing the protrusions on the back surface of the button and the bottom of the slider body respectively, the coil spring has its end portions forced, respectively, onto the protrusions to firmly hold the slider body in place. Thus, the components involved become easy to be incorporated into the assembly.

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 switching device having an operation button member to be depressed includes at least one contact member to be moved by the operation button member when the operation button member is depressed. The contact member is electrically conductive and a conductive member for contacting the contact member when the operation button member is depressed by a predetermined amount is provided. An elastic member is arranged opposite to the at least one contact member with respect to the conductive member, so as to be elastically deformed when the operation button member is depressed, after the contact member has contacted the conductive member.

Abstract: Described herein is a roller contact device wherein, upon moving a drive arm into a contact closing position, a pair of roller contacts are pressed across a pair of stationary contacts through a pair of bridge links and a pair of roller shafts by a pair of support shafts which are each forwardly pressed by a compression spring, thereby closing the contacts. In the event if there is a difference in height between the contacting surfaces of the two stationary contacts, the bridge links are inclined to hold the roller contacts securely in the contact closing positions.

Abstract: A pivoting electrical connected useable in a molded case circuit breaker including a pair of contact plates for contacting the circular contact member of a contact carrying arm. The pivoting electrical connection provides at least three contact locations between the contact plates and the circular contact member. The contact locations provide current paths between a first terminal coupled to the contact plates and an electrical contact fixed to the contact carrying arm. The pivoting electrical connection allows the contact on the arm and an electrical contact coupled to a second terminal to be opened and closed.

Abstract: A contact spring for a bistable relay for the switching of higher current will be described in which the actual contact spring is at least one stranded wire connected in parallel, which takes a part of the currents.

Abstract: A switch device comprises a resilient contact member and a support member carrying the contact member. The support member is movable between a first position in which the contact member is in electrically-conductive contact with two conductor elements that are stationary relative to each other and a second position in which the contact member is spaced from at least one of the conductor elements. A resilient member urges the support member in the direction from the second position towards the first position.

Abstract: An electric switch wherein a fixed contact is engaged by a tiltable and reciprocable second contact under the action of an elastic washer or a coil spring. The second contact can be tilted by a projection, which extends from the housing, in cooperation with a flat abutment in the housing. When the projection is tilted, it causes the second contact to pivot relative to the abutment and to become disengaged from the fixed contact. The projection can be tilted by a bar or a tube which must be displaced by a person or object tending to penetrate into a danger zone, such as the nip of two cylinders in a printing machine or a machine tool. A third contact can be provided to be engaged by the second contact when the latter is disengaged from the fixed contact.

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 multiple position, multiple contact key switch, and method of constructing same, including an electrical contact module having a housing defined by first and second separable housing members which snap together in a direction perpendicular to the longitudinal rotational axis of the key switch. The first and second housing members each carry contact sets which alternate with one another along the longitudinal axis. Each housing member includes posts which extend towards the opposing housing member, to maintain the desired positions of the elements of the contact sets carried by the opposing housing member. An arbor is mounted for rotation within the housing, with the arbor having cams spaced along the rotational axis for actuating the contact sets. A halo module and a lock module form a subassembly which is coupled with the electrical contact module, with adjacent ends of the lock module and electrical contact module engaging to transmit rotary motion of the lock module to rotary motion of the arbor.

Abstract: A key operated switch for keyboards having an improved layer type construction comprising a key carrier and key return spring supporting printed circuit conductors and contacts so arranged as to facilitate fully automatic production of keyboards. The simple formation of a leaf spring, a key guide and the key stem comprising the switch enables these parts also to be assembled by machine, making the manufacture of a keyboard simple and inexpensive.

Abstract: A key operated switch for keyboards having a layer type construction of key support carrying printed circuits arranged to facilitate fully automatic production of keyboards. Further, the simple formation of a leaf spring, a key guide and the key stem comprising the switch enables these parts also to be assembled by machine. The simple and hence inexpensive manufacture of a keyboard utilizing the key operated switches causes no loss of operating quality.

Abstract: Dual-in-line switch comprises a housing assembly having a plurality of side-by-side slide housings therein. The slide housings each have a spring means therein which bears against a pivoted contact bar which overlaps the first and second switch conductors and is pivoted on one of the conductors. When the slide housing is moved, it causes rocking of the contact bar to change the condition of the switch. The spring means in the slide housing comprises two bellows springs, each of which has a fixed end which bears against the interior wall of the slide housing and a free end. The free ends are integral with each other and bear against the rockable contact bar.

Abstract: A molded case circuit breaker includes a movable lower electrical contact assembly having a formed stationary conductor member, a movable lower contact arm, a lower contact secured to the upper end of the movable lower contact arm for physically and electrically contacting separate upper electrical contacts, and a lower contact arm torsion spring. An integral longitudinal end of the stationary conductor member extends from the base of the circuit breaker to form an external terminal of the circuit breaker. The opposite longitudinal end of the stationary conductor member receives a rotatable pin fixedly secured to the movable lower contact arm for rotation therewith. The lower contact arm torsion spring has an elongated torsion spring arm disposed in contact with an elongated inclined cam surface located on the underside of the movable lower contact arm to bias the lower contact secured thereto into engagement with the upper electrical contact.

Abstract: A continuous-current switch for shorting at least one superconducting magnet winding is provided with at least two contacts, each of which comprises several superconducting conductor sections which are arranged parallel to one another. The superconducting conductor sections are connected to support elements and are cooled by a cryogenic coolant. An actuating device is provided for joining the superconducting conductor sections together with a predetermined contact pressure. In order to ensure contact resistances are as low as possible for large superconducting magnets, the invention provides that the superconducting sections are arranged at the surfaces of the contacts facing each other in at least substantially parallel planes whereby the superconducting conductor sections of the first contact cross the superconducting conductor sections of the other contact.

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: A molded case circuit breaker includes a movable lower electrical contact having a formed stationary member, a movable contact arm, a pair of electrical contact compression springs, a contact arm compression spring and a contact secured to the upper end of the movable contact arm for physically and electrically contacting a separable upper electrical contact. An integral longitudinal end portion of the stationary member extends through the base of the cirucit breaker to form an external terminal of the circuit breaker. The opposite longitudinal end of the stationary member is curved for receiving a rotatable pin fixedly secured to the movable contact arm for rotation therewith. The rotatable pin is biased by the pair of compression springs into effective current conducting contact with the curved end of the stationary member. The contact arm compression spring contacts the underside of the movable contact arm to bias the contact secured thereto into engagement with the upper electrical contact.

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 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 an elongated contact carrier which is connected in its central region by means of a pin and slot combination (providing a free floating coupling arrangement) to the contact actuator member. A compression spring is positioned between the contact actuator member and a portion of the contact carrier between the pin and slot combination and the other end of the contact carrier. When the contact actuator member is in the first position, the compression spring produces a torque in one direction about the other end of the contact carrier forcing the contacts closed.

Abstract: A movable contact arm for circuit breakers allows the contact opening characteristics to be determined over an entire range of breaker ratings. The contact arm is provided with a camming surface with the contact closure spring arranged as a cam follower. Under short circuit conditions, the contact repulsion force is sufficient to overcome the bias provided by the contact closure spring and to drive the cam follower along the camming surface so that the resulting spring torque rapidly changes from a high initial torque on the contact arm to zero torque in a very short period of time. The contact arm is linked with the contact operating mechanism to open upon current overload in response to the trip mechanism.

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: A high tension circuit breaker which includes a stationary switching mechanism, a second switching mechanism axially movable in a first axial direction, a first and second arcing contact operatively connected to the movable switching mechanism and a stationary switching mechanism, respectively, wherein the first contact normally pressingly engages the second contact, a supply for gas under pressure, a nozzle communicating with the gas supply formed in the movable contact and terminating adjacent the first and second contact for communicating expanded gas from the gas supply to the point of pressing engagement of the first and second contact upon cutting out of the gas supply for shifting of the second contact in a second axial direction opposite the first axial direction of movement of the movable switching mechanism upon cutting out of the gas supply.