Abstract: The present invention provides a power tool in which the permanent set of an elastic member is suppressed and the vibration reduction effect is maintained over a long period of time. A rubber ring is disposed as the elastic member between a wheel washer mounted on a spindle and a substrate of a diamond wheel, and these are secured by a locknut screwed to a tip of the spindle. This rubber ring absorbs the vibrations applied to the diamond wheel at grinding work. A mounting hole of the substrate is mounted on a boss portion of the wheel washer with a clearance fit, and spring pins whose both ends are supported by the wheel washer and a portion of a holding plate in the locknut are inserted into insertion holes of the substrate and insertion holes of the rubber ring with a clearance fit.

Abstract: The present invention provides a power tool in which the permanent set of an elastic member is suppressed and the vibration reduction effect is maintained over a long period of time. A rubber ring is disposed as the elastic member between a wheel washer mounted on a spindle and a substrate of a diamond wheel, and these are secured by a locknut screwed to a tip of the spindle. This rubber ring absorbs the vibrations applied to the diamond wheel at grinding work. A mounting hole of the substrate is mounted on a boss portion of the wheel washer with a clearance fit, and spring pins whose both ends are supported by the wheel washer and a portion of a holding plate in the locknut are inserted into insertion holes of the substrate and insertion holes of the rubber ring with a clearance fit.

Abstract: An offset type grindstone having a circular metal substrate provided in a central section thereof with a recess having a hole used to mount the grindstone on a power tool, and a grindstone portion including one layer of either diamond grains or CBN grains and formed in one body so as to extend continuously in the direction of an outer circumference of a front surface of the recess, in which grindstone the concentration of the grains on the grindstone portion is set high in a region of an outer circumferential end section thereof, and low in the other region thereof. This grindstone is superior in lifetime with a very high grinding speed and a high flat grindability attained at once.

Abstract: An offset type grindstone having a circular metal substrate provided in a central section thereof with a recess having a hole used to mount the grindstone on a power tool, and a grindstone portion including one layer of either diamond grains or cBN grains and formed in one body so as to extend continuously in the direction of an outer circumference of a front surface of the recess, in which grindstone the concentration of the grains on the grindstone portion is set high in a region of an outer circumferential end section thereof, and low in the other region thereof. This grindstone is superior in lifetime with a very high grinding speed and a high flat grindability attained at once.

Abstract: There is provided a mounting member to be detachably screwed onto the rotary shaft of a power tool, and during the attachment and detachment of the mounting member to and from the power tool, a part for clamping and integrally securing a rotary cutter between an inner flange and an outer flange which functions as a lock nut is constructed by fitting a claw of the inner flange onto a fitting groove formed in the outer flange. Owing to this construction, it is possible to highly precisely and integrally secure the mounting member to individual rotary cutters.

Abstract: In a gas sensor element, an alkali metal ion conductor is provided with a detection electrode comprising an alkali metal carbonate in dissociation equilibrium with CO2 gas on one side thereof and a solid standard electrode on the other side thereof. The alkali metal carbonate is bonded to the alkali metal ion conductor via a bonding agent comprising an alkaline earth metal carbonate which is capable of forming an eutectic low-melting composition with the alkali metal carbonate.

Abstract: A CO.sub.2 gas sensor using a solid reference electrode in combination with a lithium ion conductive solid electrolyte which is at dissociative equilibrium with CO.sub.2 gas, characterized in that the solid reference electrode is made of a lithium containing, mixed transition metal oxide conductor which is of the same conduction type as the solid electrolyte. Further, the solid electrolyte comprises a complex carbonate containing LiAlO.sub.2 as an aggregate. Furthermore, a mixed electrode is used for the solid-electrolyte type gas sensor, which is prepared by the steps of: mixing a Au powder or paste with a powder of an oxide excluding Al.sub.2 O.sub.3 ; rendering a resultant mixture to a paste; applying the paste onto a solid electrolyte; and sintering the applied paste.

Abstract: A backing plate is formed by way of a liquid metal forging process or a die-casting process by using an aluminum alloy or an aluminum-based composite material. Essential portions to which forces are applied are formed with a large thickness, and the remaining portions with a small thickness. In addition, as another embodiment, iron pieces are embedded in portions to which forces are applied or which are liable to be worn.

Abstract: A solar cell substrate comprising a glass plate, and a transparent electrically conductive layer formed thereon, wherein said glass plate is tempered.

Abstract: A gas feeding nozzle feeds at least one kind of gas to form a thin film on a substrate by a normal pressure vapor deposition process. The nozzle is constituted by a plurality of plate-like bodies. A single or a plurality of slit-like gas discharging apertures are formed by stacking spacers each having at least one cut portion in the gas-discharging direction and partition plates for separating a stream of gas from another stream of gas adjacently flowing. A gas supplying plate with at least one gas supplying opening and at least one groove for flowing the gas in its width direction is attached on at least one of the outermost plate-like bodies.

Abstract: A plastic-clad light-transmitting fiber consisting essentially of a core of quartz glass or optical glass and a clad of plastic material, characterized in that said clad of plastic material is a cured body of a solvent-soluble fluoroolefin polymer having curable sites.

Abstract: A mold capable of imparting uniform transparency to the calcium phosphate type crystallized glass, in which crystals of calcium metaphosphate are present at the shaping surface of the mold which comes into contact with the material to be shaped.

Abstract: A roll machine for straightening a brake shoe comprising a main roller and a dependent roll. The main roll has a groove into which the web of the brake shoe is fit and flanges slightly shorter than the thickness of the brake shoe film. The freely rotating dependent roll is hydraulically pressed against the turning main roll and brake shoe. A replaceable block is disposed between the hydraulic piston rod and the support of the dependent roll and a roller pin perpendicular to axis of the two rolls is placed in corresponding grooves of the block and dependent roll support.

Abstract: A staining composition for use in manufacturing artificial tooth, etc. which is composed of Ca and P at their atomic ratio (Ca/P) in a range of from 0.05 to 0.33; and 5 to 28 mol % of Al.sub.2 O.sub.3.

Abstract: A method for molding calcium phosphate type glass, which comprises pouring a melt of calcium phosphate into a mold, and cooling and solidifying it, wherein the mold contains boron nitride at least at the surface thereof.

Abstract: A composite membrane for gas separation having a three-layered structure comprising:(A) a porous polymer supporting membrane layer having a cross-sectional oxygen permeation flux of at least 5 m.sup.3 /m.sup.2.hr.atm (STP) and having an asymmetric porous structure such that the average pore diameter at one surface is from 5 to 500 .ANG. and the average pore diameter at the other surface is greater than that at said one surface;(B) a polyorganosiloxane layer having a thickness of from 300 .ANG. to 5 .mu.m; and(C) a thin layer having a thickness of from 100 to 5000 .ANG. and made of a polymer containing monomer units of at least one monomer selected from the group consisting of fluoroolefin monomers and pivalate ##STR1## group-containing monomers, being soluble in an organic solvent and having an O.sub.2 /N.sub.2 permeability coefficient ratio of at least 3.

Abstract: Calcium phosphate type crystallizable glass for dental materials, which is composed essentially of from 41 to 49.5 mol % of CaO, from 50 to 58.5 mol % of P.sub.2 O.sub.5 and from 0.5 to 5 mol % of Al.sub.2 O.sub.3, and which has an atomic ratio of calcium to phosphorus (Ca/P) within a range of from 0.35 to 0.49.