Abstract: A chuck including: (a) a main body; (b) three slot-defining members each constituted by a member independent of the main body and defining therein a guide slot, and detachably attached to the main body; (c) three jaws each including (c-1) a fitted portion slidably fitted in the guide slot defined in the corresponding slot-defining member and (c-2) an engaging portion which projects from the fitted portion in an axial direction and which is configured to engage with a circumferential surface of an object that is to be held by the chuck; and (d) three pairs of pressing members detachably fixed to the three slot-defining members. Each pair of the three pairs of pressing members engage with the fitted portion of the corresponding jaw, for thereby preventing separation of the fitted portion of the corresponding jaw from the guide slot defined in the slot-defining member.

Abstract: A hydraulic shock absorbing apparatus of a vehicle is described in which hydraulic shock absorbers are provided at both left and right sides of a wheel. One hydraulic shock absorber is provided with a compression side damping valve in one oil passage of a piston, is provided with a check valve in another oil passage, and is provided with a volume compensating oil passage of a piston rod communicated with an oil reservoir chamber in a piston rod side oil chamber. The other hydraulic shock absorber is provided with an expansion side damping valve in one oil passage of the piston, is provided with a check valve dosing at the time of expansion and opening at the time of compression in another oil passage, and is provided with a volume compensating oil passage of the piston rod communicated with the oil reservoir chamber in a piston side oil chamber.

Abstract: In a front fork, a throttle flow path is provided between a hole which is provided in an inner tube and is communicated with an annular gap chamber, and a lower oil chamber in an outer periphery of a hollow pipe.

Abstract: In a front fork, a throttle flow path is provided between a hole which is provided in an inner tube and is communicated with an annular gap chamber, and a lower oil chamber in an outer periphery of a hollow pipe.

Abstract: A vehicle height adjusting apparatus of a hydraulic shock absorber has a hydraulic pump carrying out a pumping action by an extending and retracting motion of a piston rod with respect to a damper tube so as to feed a working fluid to a jack chamber of a hydraulic jack, and a blow valve releasing a jack pressure of the jack chamber which is pressurized by a plunger of the hydraulic jack exposed to a spring load on a suspension spring.

Abstract: A chuck including: (a) a main body; (b) three slot-defining members each constituted by a member independent of the main body and defining therein a guide slot, and detachably attached to the main body; (c) three jaws each including (c-1) a fitted portion slidably fitted in the guide slot defined in the corresponding slot-defining member and (c-2) an engaging portion which projects from the fitted portion in an axial direction and which is configured to engage with a circumferential surface of an object that is to be held by the chuck; and (d) three pairs of pressing members detachably fixed to the three slot-defining members. Each pair of the three pairs of pressing members engage with the fitted portion of the corresponding jaw, for thereby preventing separation of the fitted portion of the corresponding jaw from the guide slot defined in the slot-defining member.

Abstract: A vehicle height adjusting apparatus of a hydraulic shock absorber has a hydraulic pump carrying out a pumping action by an extending and retracting motion of a piston rod with respect to a damper tube so as to feed a working fluid to a jack chamber of a hydraulic jack, and a blow valve releasing a jack pressure of the jack chamber which is pressurized by a plunger of the hydraulic jack exposed to a spring load on a suspension spring.

Abstract: A hydraulic shock absorbing apparatus of a vehicle is described in which hydraulic shock absorbers are provided at both left and right sides of a wheel. One hydraulic shock absorber is provided with a compression side damping valve in one oil passage of a piston, is provided with a check valve in another oil passage, and is provided with a volume compensating oil passage of a piston rod communicated with an oil reservoir chamber in a piston rod side oil chamber. The other hydraulic shock absorber is provided with an expansion side damping valve in one oil passage of the piston, is provided with a check valve dosing at the time of expansion and opening at the time of compression in another oil passage, and is provided with a volume compensating oil passage of the piston rod communicated with the oil reservoir chamber in a piston side oil chamber.

Abstract: A recessed portion is formed in an area, of a rear surface of a wafer, corresponding to a device formation area is formed by a rough grinding wheel of a rough grinding unit and an annular protruding portion is concurrently formed around the recessed portion. The inner circumferential lateral surface of the recessed portion is next ground by a finishing grinding wheel of a finishing grinding unit and the bottom surface is subsequently ground.

Abstract: A spin etching method for etching a back-side surface of a semiconductor wafer provided with a plurality of devices on the face side and subjected to back grinding, wherein the semiconductor wafer is held with its back-side surface down, and the back-side surface of the semiconductor wafer is supplied with an etching liquid from an etching liquid supply nozzle disposed on the lower side of the semiconductor wafer while the semiconductor wafer being rotated.

Abstract: In a hydraulic shock absorber, an outer operating oil chamber within an inner tube is communicated with a piston rod side oil chamber within a cylinder, an annular oil chamber is compartmentalized between an inner periphery of an outer tube and an outer periphery of the inner tube, the annular oil chamber is communicated with the outer operating oil chamber within the inner tube via an oil hole provided in the inner tube, a cross sectional area of the annular oil chamber is formed larger than a cross sectional area of a piston rod, and the hydraulic shock absorber has a volume compensating flow path which circulates the oil in an inner operating oil chamber or the outer operating oil chamber to an oil reservoir chamber in an expansion aside stroke in which the piston rod outgoes from the inner operating oil chamber, and a check valve which prevents the oil flow from the inner operating oil chamber or the outer operating oil chamber to the oil reservoir chamber in the expansion side stroke.

Abstract: A wafer grinding method is disclosed, in which only a region, corresponding to a device formation region, of the back side of a wafer is ground in rough grinding conducted first, while the part surrounding the region thus ground is left unground as an annular projected part, to prevent the outer peripheral edge of the wafer from becoming knife edge-like in shape. In the subsequent finish grinding, the annular projected part is ground and, further, the whole area of the back side of the wafer is ground to be flat. Chippings of the outer peripheral edge may be generated only during the finish grinding, whereby the chippings are prevented from occurring or limited to minute ones.

Abstract: A recessed portion is formed in an area, of a rear surface of a wafer, corresponding to a device formation area is formed by a rough grinding wheel of a rough grinding unit and an annular protruding portion is concurrently formed around the recessed portion. The inner circumferential lateral surface of the recessed portion is next ground by a finishing grinding wheel of a finishing grinding unit and the bottom surface is subsequently ground.

Abstract: A wafer grinding method is disclosed, in which only a region, corresponding to a device formation region, of the back side of a wafer is ground in rough grinding conducted first, while the part surrounding the region thus ground is left unground as an annular projected part, to prevent the outer peripheral edge of the wafer from becoming knife edge-like in shape. In the subsequent finish grinding, the annular projected part is ground and, further, the whole area of the back side of the wafer is ground to be flat. Chippings of the outer peripheral edge may be generated only during the finish grinding, whereby the chippings are prevented from occurring or limited to minute ones.

Abstract: In a gasket used for a fuel battery, in order to solve problems with respect to making a seal portion thin, improving an assembling property, preventing a position shift, making a surface pressure low, making the surface pressure uniform, and the like, a gasket lip made of a liquid rubber hardened material is integrally formed on a surface of a flat plate made of a carbon, a graphite, a conductive resin such as a conductive phenol resin or the like, an ion exchange resin, or a metal such as a stainless steel, a magnesium alloy or the like, or on a groove portion applied to the surface.

Abstract: A hydraulic shock absorbing apparatus of a vehicle is described in which hydraulic shock absorbers are provided at both left and right sides of a wheel. One hydraulic shock absorber is provided with a compression side damping valve in one oil passage of a piston, is provided with a check valve in another oil passage, and is provided with a volume compensating oil passage of a piston rod communicated with an oil reservoir chamber in a piston rod side oil chamber. The other hydraulic shock absorber is provided with an expansion side damping valve in one oil passage of the piston, is provided with a check valve closing at the time of expansion and opening at the time of compression in another oil passage, and is provided with a volume compensating oil passage of the piston rod communicated with the oil reservoir chamber in a piston side oil chamber.

Abstract: Unit cell 1 comprises a pair of counterposed separators 2 and 3 and a membrane-electrode assembly (MEA) provided between the separators, MEA comprising polymeric electrolyte membrane 5 having a predetermined thickness and two reactor electrode layers 4 and 4′ each with a catalyst layer sandwiching the polymeric electrolyte membrane, where the polymeric electrolyte membrane and spacer sheet 5a having a predetermined thickness are vertically sandwiched by a pair of counterposed elastic resin gasket sheets 6 and 7, thereby supporting MEA, and gaskets 8 and 9 of inverted V shape made from cured rubber are integrally formed on the outer surfaces of the gasket sheets, respectively, and brought into tight contact with inner surfaces 2a and 3a of separators 2 and 3, respectively, thereby attaining desired sealing.

Abstract: In a hydraulic shock absorber in which a piston is slidably in contact with an inner periphery of an inner tube, a cross sectional area S1 of an annular oil chamber which is sectioned by an inner periphery of an outer tube and an outer periphery of the inner tube is formed larger than a cross sectional area of a piston rod. A check valve which inhibits a flow from an oil chamber to an oil storage chamber at a time of an expansion side stroke is provided in a partition member which is provided in an inner periphery of the inner tube, and a micro flow passage which communicates the oil chamber with the oil storage chamber is provided in the partition member.

Abstract: A gasket is provided on a porous sheet in one body. The gasket is thin and has an excellent sealability, and processability when the gasket is built in layer-built fuel cells. The gasket is made of liquid rubber and has a hardness not more than 60 (JIS A). Liquid perfluoro rubber and liquid silicone rubber is preferably used for the gasket. And gasket can be made by injection molding.

Abstract: In a hydraulic shock absorber in which a piston is slidably in contact with an inner periphery of an inner tube, a cross sectional area S1 of an annular oil chamber which is sectioned by an inner periphery of an outer tube and an outer periphery of the inner tube is formed larger than a cross sectional area of a piston rod. A check valve which inhibits a flow from an oil chamber to an oil storage chamber at a time of an expansion side stroke is provided in a partition member which is provided in an inner periphery of the inner tube, and a micro flow passage which communicates the oil chamber with the oil storage chamber is provided in the partition member.