A gas-insulated switchgear of which frictional force and abrasion amount at a sliding portion are small, and capable of maintaining a state having the small frictional force and abrasion amount for a long time is provided. Insulating gas is sealed in a container of a bus integral disconnecting switch 27 of a gas-insulated switchgear 10, and a movable side contact portion 31, a fixed side contact portion 32, and a movable contact 33 are provided to constitute a disconnecting portion 30. Besides, a hard carbon film 50 is formed at an outer peripheral surface of the movable contact 33 except portions which are in contact with contact terminals 32a of the fixed side contact portion 32 under a state in which the movable contact 33 is inserted into the fixed side contact portion 32 and electrically connected therewith and portions which are in contact with contact terminals 31a of the movable side contact portion 31 under an electrically disconnected state.

Ein Stößelschalter (1) für den Einsatz als Schaltelement in einer elektrischen Schaltung (2) mit einem Gehäuse (3) und einem in einer Bohrung (4) des Gehäuses axial in Richtung einer Längsachse (a) bewegbaren Stößel (5), welcher in einer in Richtung auf das Gehäuse hin heruntergedrückten Betriebsstellung auf eine im Gehäuse angeordnete elektronische Sensoreinheit (6) einwirkt, die dann ihrerseits über elektrische Impulse einen Schaltvorgang in der elektrischen Schaltung einleitet, ist dadurch gekennzeichnet, dass der Stößel in seinem axialen Eintauchbereich in die Bohrung des Gehäuses peripher mit mindestens einer Schmiernut (7) versehen ist, die ein Schmierfluid in den axialen Eintauchbereich zwischen Stößel und Bohrung eindringen lässt, und dass die elektronische Sensoreinheit einen Schutz (8) gegen ein Eindringen des Schmierfluids aufweist.

So wird mit einfachen technischen Mitteln unaufwändig und kostengünstig ein Stößelschalter der eingangs beschriebenen Art bereitgestellt, der trotz der verwendeten bewegten mechanischen Teile eine erheblich höhere Zyklenzahl bis in den Bereich von mehr als vier Millionen Betätigungen über die Lebensdauer des Stößelschalters möglich macht.

A multi-directional switching device having: a case; a switch housed in the case; one operating member capable of inclining in multi-directions, for operating the switch by means of an inclining operation in each of the directions; a first rubber dome to be operated by means of an inclining operation of the operating member; and a second rubber dome arranged in the vicinity of the first rubber dome, wherein a movable distance of the second rubber dome by the inclining operation of the operating member is made longer than that of the first rubber dome.

A control key device includes a casing (3, 7, 100) having a generally dome-shaped portion (3b) provided at an arbitrary part of the casing, the dome-shaped portion having a top surface and a hole (3a) provided at a central part of the dome-shaped portion, a substrate (6) provided within the casing and having a plurality of electrical contacts (6a-6d), a resilient member (5) provided on the substrate and having a plurality of bulges (5a-5d) at positions corresponding to the electrical contacts of the substrate, each of the bulges having an electrically conductive portion which makes electrical contact with a corresponding one of the electrical contacts when the bulge to resiliently deformed, a contact pressing member (4) provided on the resilient member and having a plurality of legs (4a-4d) at positions corresponding to the bulges of the resilient member, a key (2) secured on the contact pressing member via the hole in the dome-shaped portion of the casing, the key having a home position and a tilted position, and a mechanism (120, 121, 131, 141, s, g) for preventing the key from sticking at the tilted position or an intermediate position between the tilted position and the home position. One of the legs of the contact pressing member resiliently deforms a corresponding one of the bulges of the resilient member to achieve electrical contact between the electrically conductive portion of the corresponding one bulge and a corresponding one of the electrical contacts of the substrate in the tilted position of the key, and the key has a sliding surface which makes sliding contact with the top surface of the dome-shaped portion of the casing when tilting to the tilted position.

A circuit breaker wherein at least a pin sliding surface (14c) of a guide hole (14) of a first contact arm (110A), a pin sliding surface (15a) of a long hole (15) of a second contact arm (110B) and a contact surface (116a) of a second pin (116) in contact with both the pin sliding surfaces (14c, 15a) are treated by a low-friction treatment to reduce frictional re­sistance and/or surface-treated to provide surfaces exempt from attachment of molten metal caused by arcing. Furthermore at least the pin sliding surface (14c) of the first contact arm (110A) and the pin sliding surface (15a) of the long hole (15) of the second contact arm (110B) are hardened to provide both the pin sliding surfaces (14c, 15a) with greater hardness than the second pin (116), thereby ensuring smooth movement of the second pin (116).

Bei dem Verfahren wird Trockenschmiermittel, insbesondere MoS₂ (Molybdändisulfid)-Pulver in einem ersten Schritt auf die Oberfläche der Teile aufgebracht. Anschließend werden in einem zweiten Schritt die Teile mit einem Wachs, Hartwachs oder Hartparaffin derart behandelt, daß der auf den Teilen befindliche Überschuß an Pulver entfernt und zugleich die Oberfläche mit einem dünnen Wachsfilm versiegelt wird. Das Verfahren ist insbesondere zum Schmieren der Verklinkungsteile im Schaltmechanismus von Leitungsschutzschaltern vorgesehen.

A remotely controlled circuit control device has first and second load contact assemblies movable into circuit engagement and circuit disengagement positions relative to one another in which one load contact assembly is operatively connected to a solenoid so that alternate forward strokes of the solenoid moves the one load contact assembly between reset and tripped positions through a push-push mechanism having an indexing portion and a latching portion. An overload mechanism cooperates with the latch portion to cause the load contact assemblies to move to the circuit disengaged position upon occurrence of a fault condition. The second load contact assembly includes pivotably mounted contact members which are linked to the first load contact assembly in such a way that circuit engagement during solenoid energization is precluded. The push-push mechanism is operatively connected via a mode switch to either a reset circuit or a trip circuit and in turn to a remotely disposed indicator-control unit (ICU) through an optical coupler. Contact status and coordination between load contacts and ICU contacts are provided by a feedback circuit. An interface circuit allows operation of the circuit control device without discrimination on a power supply of either alternating or direct voltage or both. Life expectancy of the device is enhanced by several features including double break contacts with contact wiping and the provision of a floating output arm for the solenoid.

A slide electricity structure according to the present invention uses grease for electrical contacts wherein contact resistance does not gradually increase even when exposed to sliding and lifetime is long, and has a silver-plated spring contact that contacts or separates by way of sliding and grease for electrical contacts that has been applied to the spring contact and contains perfluoropolyether oil having an average molecular weight between 2600 and 12500 as a base oil and PTFE having a primary particle diameter of 1 µm or less as a thickener.

A multi-directional switching device having: a case; a switch housed in the case; one operating member capable of inclining in multi-directions, for operating the switch by means of an inclining operation in each of the directions; a first rubber dome to be operated by means of an inclining operation of the operating member; and a second rubber dome arranged in the vicinity of the first rubber dome, wherein a movable distance of the second rubber dome by the inclining operation of the operating member is made longer than that of the first rubber dome.

A circuit breaker (20') includes a housing (22); separable contacts (30) housed by the housing (22); an operating mechanism (80), for moving the separable contacts (30) between a closed position and an open position thereof, having a first position and a second position corresponding to the open position; a latching and releasing mechanism (86,86') for latching the operating mechanism (88,88') in the first position thereof and for releasing the operating mechanism (88,88') to the second position thereof; a rotatable trip bar (80') rotatable in a first rotational direction and a second rotational direction for unlatching the latching and releasing mechanism (86,86'); a sensing mechanism (74,149,150) for sensing an electrical condition associated with the separable contacts (30) and for moving the trip bar (80') in the second rotational direction in order to unlatch the latching and releasing mechanism (86,86'), release the operating mechanism (88,88') to the second position thereof, and move the separable contacts (30) to the open position thereof; and an adjustable bias spring (144) for biasing the trip bar (80') in the first rotational direction.

A control key device includes a casing (3, 7, 100) having a generally dome-shaped portion (3b) provided at an arbitrary part of the casing, the dome-shaped portion having a top surface and a hole (3a) provided at a central part of the dome-shaped portion, a substrate (6) provided within the casing and having a plurality of electrical contacts (6a-6d), a resilient member (5) provided on the substrate and having a plurality of bulges (5a-5d) at positions corresponding to the electrical contacts of the substrate, each of the bulges having an electrically conductive portion which makes electrical contact with a corresponding one of the electrical contacts when the bulge is resiliently deformed, a contact pressing member (4) provided on the resilient member and having a plurality of legs (4a-4d) at positions corresponding to the bulges of the resilient member, a key (2) secured on the contact pressing member via the hole in the dome-shaped portion of the casing, the key having a home position and a tilted position, and a mechanism (120, 121, 131, 141, s, g) for preventing the key from sticking at the tilted position or an intermediate position between the tilted position and the home position. One of the legs of the contact pressing member resiliently deforms a corresponding one of the bulges of the resilient member to achieve electrical contact between the electrically conductive portion of the corresponding one bulge and a corresponding one of the electrical contacts of the substrate in the tilted position of the key, and the key has a sliding surface which makes sliding contact with the top surface of the dome-shaped portion of the casing when tilting to the tilted position.

In an electromagnetic switch for a starter motor, power produced by friction from repeated opening and closing of the stationary and movable contacts 22, 26 is prevented from entering between the sliding parts of the movable iron core assembly 4, thus ensuring smooth sliding motion of the movable iron core assembly at all times, and the penetration of external water into the spaced defined by the stationary and movable iron cores 9, 4 and a shaft member 20 is effectively prevented. The shaft member is disposed inside the annular stationary iron core for movement in the axial direction. An insulating sleeve 21' is fitted over the shaft member and fixed thereto for movement therewith. The insulating sleeve has a cylindrical outer peripheral surface of a diameter slightly smaller than the inside diameter of the radially innermost surface of the stationary iron core, and the outer peripheral surface of the insulating sleeve has an axial length D larger than the axial distance between the stationary contact 22 and the stationary iron core 9 so that there is maintained a limited constant clearance c between the insulating sleeve and the stationary iron core at all times irrespective of the axial position of the insulating sleeve relative to the stationary iron core, so that the space defined by the stationary and movable iron cores is substantially sealed. The electromagnetic switch includes a cylindrical housing 8 accommodating an electromagnetic coil 12, the housing having one open end closed by a cap 11 to which stationary contact 22 is firmly attached. An annular stationary iron core 9 is disposed in and fixed to the housing. The movable iron core assembly 4 is disposed inside the electromagnetic coil and includes shaft member 20 connected with a movable iron core 16 the axially slidably fitted in the electromagnetic coil in face-to-face relation with the stationary iron core for movement towards and away from the stationary iron core. Movable contact is mounted on one end of the insulating sleeve and thus electrically insulated from the movable shaft, and contacts the stationary contact 22 on the axial movement of the shaft member caused by energization of the electromagnetic coil.

In an electromagnetic switch for a starter motor, power produced by friction from repeated opening and closing of the stationary and movable contacts 22, 26 is prevented from entering between the sliding parts of the movable iron core assembly 4, thus ensuring smooth sliding motion of the movable iron core assembly at all times, and the penetration of external water into the spaced defined by the stationary and movable iron cores 9, 4 and a shaft member 20 is effectively prevented. The shaft member is disposed inside the annular stationary iron core for movement in the axial direction. An insulating sleeve 21' is fitted over the shaft member and fixed thereto for movement therewith. The insulating sleeve has a cylindrical outer peripheral surface of a diameter slightly smaller than the inside diameter of the radially innermost surface of the stationary iron core, and the outer peripheral surface of the insulating sleeve has an axial length D larger than the axial distance between the stationary contact 22 and the stationary iron core 9 so that there is maintained a limited constant clearance c between the insulating sleeve and the stationary iron core at all times irrespective of the axial position of the insulating sleeve relative to the stationary iron core, so that the space defined by the stationary and movable iron cores is substantially sealed. The electromagnetic switch includes a cylindrical housing 8 accommodating an electromagnetic coil 12, the housing having one open end closed by a cap 11 to which stationary contact 22 is firmly attached. An annular stationary iron core 9 is disposed in and fixed to the housing. The movable iron core assembly 4 is disposed inside the electromagnetic coil and includes shaft member 20 connected with a movable iron core 16 the axially slidably fitted in the electromagnetic coil in face-to-face relation with the stationary iron core for movement towards and away from the stationary iron core. Movable contact is mounted on one end of the insulating sleeve and thus electrically insulated from the movable shaft, and contacts the stationary contact 22 on the axial movement of the shaft member caused by energization of the electromagnetic coil.

A remotely controlled circuit control device has first and second load contact assemblies movable into circuit engagement and circuit disengagement positions relative to one another in which one load contact assembly is operatively connected to a solenoid so that alternate forward strokes of the solenoid moves the one load contact assembly between reset and tripped positions through a push-push mechanism having an indexing portion and a latching portion. An overload mechanism cooperates with the latch portion to cause the load contact assemblies to move to the circuit disengaged position upon occurrence of a fault condition. The second load contact assembly includes pivotably mounted contact members which are linked to the first load contact assembly in such a way that circuit engagement during solenoid energization is precluded. The push-push mechanism is operatively connected via a mode switch to either a reset circuit or a trip circuit and in turn to a remotely disposed indicator-control unit (ICU) through an optical coupler. Contact status and coordination between load contacts and ICU contacts are provided by a feedback circuit. An interface circuit allows operation of the circuit control device without discrimination on a power supply of either alternating or direct voltage or both. Life expectancy of the device is enhanced by several features including double break contacts with contact wiping and the provision of a floating output arm for the solenoid.