Abstract: In a hydraulic pressure actuating apparatus for a circuit breaker, contacts of the circuit breaker have a moving contact and a stationary contact for turning on/off current. A shaft, at an end portion of which is attached the moving contact, and at the other end of which is attached a piston, is received within a cylinder. A directional control valve exchanges oil pressure for actuating the piston. For changing over the directional control valve, pilot valves are provided. Each pilot valve has a pair of valve bodies, each opposing to each other, and springs. One of the valve bodies is able to stroke up to contact with the valve body of the other valve body, therefore giving no ill influences upon actuating time, even if drawback occurs in the pilot valves in the hydraulic pressure actuating apparatus for the circuit breaker.

Abstract: To reduce the size of a gas-insulated switch for the purpose of utilizing the space of a power station or substation effectively and improving the economy thereof. A gas-insulated switch equipped with a fixed contact and a moving contact that can contact with and separate from the fixed contact, wherein the breakage of the moving contact is operated with a single shock absorber in both the breaking action and the closing action of the moving contact. As a result that use of the gas-insulated switch according to the present invention improves the overall energy efficiency of components, a device with further reduced driving energy can be realized for a gas-insulated switch of the same specification.

Abstract: A gas-insulated switch equipped with a fixed contact and a moving contact that can contact with and separate from the fixed contact, wherein a single shock absorber absorbs the shock in both the breaking action and the closing action of the moving contact.

Abstract: A gas-insulated switch equipped with a fixed contact and a moving contact that can contact with and separate from the fixed contact, wherein a single shock absorber absorbs the shock in both the breaking action and the closing action of the moving contact.

Abstract: A color-mixing fixing device includes a first fixing rotary member, and a second fixing rotary member for forming a nip together with the first fixing rotary member. After toner images of a plurality of colors stacked on one surface of a recording medium are fixed by a nip, toner images of a plurality of colors stacked on the other surface of the recording medium are fixed by the nip, thereby forming full-color images on both the surfaces of the recording medium. Each of the first and second fixing rotary members has a surface rubber layer with an impact resilience of 50% or less.

Abstract: A puffer type gas circuit breaker wherein an insulated nozzle made of heat proof resin and a movable arc contact are mounted on a puffer cylinder to perform an open/close operation of the contact. The insulated nozzle is divided into three areas of a downstream area, an area in the vicinity of the throat and an upstream area. The downstream area and the upstream area are made of heat proof resin alone, while the area in the vicinity of the throat is formed of heat proof resin mixed with an inorganic material such as boron nitride. A movable arc contact cover made of heat proof resin having a downstream area and an upstream area is provided between the insulated nozzle and the movable arc contact, and only the downstream area of the contact cover is made of heat proof resin mixed with inorganic material.

Abstract: To reduce the size of a gas-insulated switch for the purpose of utilizing the space of a power station or substation effectively and improving the economy thereof. A gas-insulated switch equipped with a fixed contact and a moving contact that can contact with and separate from the fixed contact, wherein the breakage of the moving contact is operated with a single shock absorber in both the breaking action and the closing action of the moving contact. As a result that use of the gas-insulated switch according to the present invention improves the overall energy efficiency of components, a device with further reduced driving energy can be realized for a gas-insulated switch of the same specification.

Abstract: In a hydraulic pressure actuating apparatus for a circuit breaker, contacts of the circuit breaker has a moving contact 2 and a stationary contact 1 for turning on/off current. A shaft, at an end portion of which is attached the moving contact, and at the other end of which is attached a piston 5, is received within a cylinder 4. A directional control valve 13 exchanges oil pressure for actuating the piston. For changing over the directional control valve, pilot valves 50 and 60 are provided. Each pilot valve has a pair of valve bodies 53 and 55 or 63 and 65, each opposing to each other, and springs 54 and 64. One of the valve bodies is able to stroke up to contact with the valve body of the other valve body, therefore giving no ill influences upon actuating time, even if drawback occurs in the pilot valves in the hydraulic pressure actuating apparatus for the circuit breaker.

Abstract: To reduce the size of a gas-insulated switch for the purpose of utilizing the space of a power station or substation effectively and improving the economy thereof. A gas-insulated switch equipped with a fixed contact and a moving contact that can contact with and separate from the fixed contact, wherein the breakage of the moving contact is operated with a single shock absorber in both the breaking action and the closing action of the moving contact. As a result that use of the gas-insulated switch according to the present invention improves the overall energy efficiency of components, a device with further reduced driving energy can be realized for a gas-insulated switch of the same specification.

Abstract: A highly reliable gas circuit breaker capable of improving the braking performance and the insulating performance and a gas circuit breaker capable of allowing a stress acting on the supporting member of the electrode are provided. The gas circuit breaker comprising a grounded tank filled with an insulation medium; a movable electrode arranged inside the grounded tank; a fixed electrode which is supported through an insulator supporting member inside the grounded tank and disposed detachably from and oppositely to the movable electrode; and electric conductive parts individually provided in the movable electrode and the fixed electrode, wherein the insulator supporting member is a solid cone and supports the fixed electrode in an upper side of a central axis of the grounded tank.

Abstract: A puffer type gas circuit breaker wherein an insulated nozzle 2 made of heat proof resin and movable arc contact 3 are mounted on a puffer cylinder 4 to perform an open/close operation of the contact. In this circuit breaker, the insulated nozzle 2 is divided into three areas; a downstream area 2a, an area in the vicinity of the throat 2b and an upstream area 2c. The downstream area 2a and upstream area 2c are made of heat proof resin alone, while the area in the vicinity of the throat 2b is formed of heat proof resin mixed with inorganic material such as boron nitride. A movable arc contact cover 9 made of heat proof resin having two areas—a downstream area 9a and upstream area 9b—is provided between insulated nozzle 2 and movable arc contact 3, and only the downstream area 9a is made of heat proof resin mixed with inorganic material.

Abstract: A roller has an elastic layer formed by curing a silicone rubber material containing at least expanded resin microballons, wherein, when the roller is placed in a vacuum chamber in which atmospheric pressure is reduced to 0.001 MPa or less over 2 minutes, the roller has a gas permeability indicating the recovery characteristic where an increased amount of the thickness of the elastic layer after 10 minutes from the start of evacuation is two-thirds or less of the maximum increased amount of thickness of the elastic layer during a 10 minute period from the start of evacuation. The elastic layer is formed by curing a silicone rubber material containing the expanded resin microballoons and has air void portions formed by breaking the resin microballoons and passages connecting the air void portions therebetween.

Abstract: In order to provide a gas circuit breaker capable of reducing a remarkable degradation of dielectric strength in the vessel caused by hot gas and which can be downsized, the present invention is characterized by a hot gas discharge mechanism of the movable opening/closing mechanism, which is designed to ensure that the hot gas separated and fed to a movable opening/closing mechanism is discharged from an exhaust outlet 19b toward the side opposite to the puffer chamber 26 of the gas discharge chamber 28 formed on the rear of the puffer chamber 26, and gas is discharged toward the inner surface of the vessel 4 through the exhaust outlet 23b after gas temperature and velocity have been interrupted by convection of the gas in the puffer chamber 26. This structure interrupts a remarkable degradation of dielectric strength in the vessel resulting from direct blowing of hot gas onto the inner surface of the vessel 4.

Abstract: To reduce the size of a gas-insulated switch for the purpose of utilizing the space of a power station or substation effectively and improving the economy thereof. A gas-insulated switch equipped with a fixed contact and a moving contact that can contact with and separate from the fixed contact, wherein the breakage of the moving contact is operated with a single shock absorber in both the breaking action and the closing action of the moving contact. As a result that use of the gas-insulated switch according to the present invention improves the overall energy efficiency of components, a device with further reduced driving energy can be realized for a gas-insulated switch of the same specification.

Abstract: A heating assembly having a press roller which has an elastic layer incorporated dispersedly with voids formed by resin microballoons. The press roller has a low thermal conductivity, hence heat from a heating means can effectively be utilized. It has also a low hardness, so that a pressure contact nip formed between it and the heating means can be made wider.

Abstract: In order to provide a gas circuit breaker capable of reducing a remarkable degradation of dielectric strength in the vessel caused by hot gas and which can be downsized, the present invention is characterized by a hot gas discharge mechanism of the movable opening/closing mechanism, which is designed to ensure that the hot gas separated and fed to a movable opening/closing mechanism is discharged from an exhaust outlet 19b toward the side opposite to the puffer chamber 26 of the gas discharge chamber 28 formed on the rear of the puffer chamber 26, and gas is discharged toward the inner surface of the vessel 4 through the exhaust outlet 23b after gas temperature and velocity have been interrupted by convection of the gas in the puffer chamber 26. This structure interrupts a remarkable degradation of dielectric strength in the vessel resulting from direct blowing of hot gas onto the inner surface of the vessel 4.

Abstract: An oil coating roller is provided which has superior releasing properties and will not abrade an edge portion of an oil control blade. In the oil coating roller having a topmost exterior layer composed of a silicone rubber layer, the silicone rubber layer contains 0 to 0.5 part by weight of an inorganic filler having a predetermined average particle diameter to 100 parts by weight of a silicone rubber, and the tensile strength of the silicone rubber layer is 1.0 MPa or more. In addition, the surface roughness (Rz) of the silicone rubber layer is 0.5 to 20 &mgr;m.

Abstract: In order to provide a good gas-insulated circuit breaker which is compact and easy in assembling and preparation, a gas-insulated circuit breaker 100 is constructed with a grounded enclosure 104 enclosed a insulation nature gas, a current interruption part having a fixed contactor 115 arranged in the grounded enclosure 104 and a movable contactor 116 to be contacted with and to be separated from the fixed contactor 115, and an operating mechanism 101 to output a driving force to drive the movable contactor 116, wherein a grounded enclosure side main rotating shaft 110 connected to the movable contactor 116 through a connection member and a main output shaft 102 for outputting a rotating force to actuate the movable contactor 116 through the grounded enclosure side main rotating shaft 110 provided on the operating mechanism 101, are arranged on a coax so as to be coupled with a gear coupling 120, and the operating mechanism 101 is arranged almost under the grounded enclosure 104.

Abstract: A fluorine-containing resin-coated pressure roller exhibiting excellent anti-toner soiling characteristic even at low roller temperatures is provided. The pressure roller includes a cylindrical metal substrate, and a rubber elastic layer, an adhesive layer and a fluorine-containing resin release layer disposed in this order on and successively coating the cylindrical metal substrate. The pressure roller has a surface exhibiting a micro-rubber hardness of at most 50 deg., a contact angle with water of at least 105 deg. and a ten point-average surface roughness Rz of at most 3.0 &mgr;m. The pressure roller may be suitably combined with a fixing film to provide a film heating-type fixing device suitably used in an electrophotographic image forming apparatus.

Abstract: A color-mixing fixing device includes a first fixing rotary member, and a second fixing rotary member for forming a nip together with the first fixing rotary member. After toner images of a plurality of colors stacked on one surface of a recording medium are fixed by a nip, toner images of a plurality of colors stacked on the other surface of the recording medium are fixed by the nip, thereby forming full-color images on both the surfaces of the recording medium. Each of the first and second fixing rotary members has a surface rubber layer with an impact resilience of 50% or less.