Abstract: A ball for ball game comprising: a leather skin layer formed by sewing a plurality of leather panels by a thread, the leather skin layer having a spherical shape; and a bladder made of an elastomer having a hollow spherical shape, the bladder being accomodated in the leather skin layer, the bladder being provided with a valve for feeding air into the rubber bladder, the bladder being charged with air through the valve; wherein the thread is made of a self-shrink thread which is subjected to a shrinking treatment after sewing.

Abstract: A clip includes a fastener unit and a leg unit, the fastener unit having a pair of support plates projecting in parallel from the underside of a trim plate to be fastened and being formed at their distal ends with slits and a pair of engagement members provided on the outer surfaces of the support plates, and the leg unit having a pair of parallel wall plates formed on upper inner surface portions with steps for engaging with the engagement members of the fastener unit and a base connecting the wall plates and formed with a pair of opposing elastic legs at positions spaced from the wall plates and with lugs for engagement with the slits.

Abstract: A grommet which is easy to install in a grommet hole of an automobile panel and has good water sealing ability. The grommet is assembled from a pair of grommet halves 21a and 21b, which include a pair of plastic leading members 1a and 1b, respectively, to form a leading section of the grommet; a pair of semi-disc plastic members 6a and 6b, respectively, to form an disc section of the grommet; and a pair of resilient members 12a and 12b, respectively, joining the members 1a and 1b with the semi-disc members 6a and 6b, respectively, to form a resilient section of the grommet. The resilient member shave semi-circumferential grooves 15a and 15b, which together form a complete circumferential groove 15 for receiving the edge of the panel defining the grommet hole when the grommet halves are coupled together. The disc section has a diameter larger than that of the leading section and the resilient section.

Abstract: A method for making a ball for sports comprises providing a round rubber tube, forming a reinforcing layer of a yarn wound about the tube, forming a rubber cover layer formed on the reinforcing layer, and vulcanizing the rubber cover layer to provide a carcass. In the method, the reinforcing layer is formed by winding, in combination, a covered yarn made of a urethane elastomer core thread wound thereabout with a synthetic resin filament or in combination with the synthetic resin filament and a yarn made of a member selected from the group consisting of cotton, polyesters and polyamides. The carcass may be attached with a skin layer made of a natural or artificial leather. Alternatively, the round rubber tube having the reinforcing layer may be attached with a skin layer.

Abstract: A photopolymerization for dental use composed of a light of sources emitting at least visible light and infrared light transparent cells charged with coolant disposed to the emission side of said light source, whereby absorb infrared light; and a board for mounting a formed article which is composed of materials for a pattern made of photopolymerizable resin, impinging the light thereon from the light source after transmitting through said cells, wherein the tranparent cell is composed of disc-like shaped main body having a hollow space therein which is formed integrally with heat resistant glass; and two glass pipes for circulation of coolant which is disposed to the cell main body communicated to the hollow space.

Abstract: A spacer for elevating occlusion position is composed of a plastic material which can be deformed by occlusion pressure; and a plurality of ball members having a predetermined diameter. The ball member is made of a material which cannot be deformed by subjecting occlusion pressure, and the ball member is embedded in the plastic material so as to be in a plane.

Abstract: A molding apparatus for injection-molding a hemispherical hollow body formed of a thermoplastic elastomer and having a valve formed integrally therewith. The apparatus includes a first mold having a hemispherical convex molding surface, a second mold having a hemispherical concave molding surface larger in size than the convex molding surface. The second mold is superposed on the first mold to form a molding cavity for the hollow body. A first valve mold is removably mounted at the center of the hemispherical convex molding surface of the first mold, for forming the valve and an inside and small-diameter portion of a valve rubber insertion hole of the valve. A second valve mold is removably mounted at the center of the hemispherical concave molding surface, for forming an intermediate and large-diameter portion of the valve rubber insertion hole and an outside and small-diameter portion thereof while forming a cavity for the valve in cooperation with the first valve mold.

Abstract: A ball for ball game, comprising a base body composed of two hemispherical hollow bodies formed by injection-molding a thermoplastic elastomer and bonded together to form a spherical hollow body, said base body containing and sealing compressed air injected therein through an air-injection valve provided at an appropriate portion of one of said two hemispherical hollow bodies, and a plurality of leather panels bonded by means of an adhesive to the surface of said base body, wherein a 10% tensile stress of said thermoplastic elastomer forming said base body ranges from 30 to 190 kg/cm.sup.2. Various properties of said ball such as shock-absorptivity, shape-maintaining property, impact resilience and the like can be set within appropriate ranges.

Abstract: A spacer for elevating occlusion position is composed of a plastic material which can be deformed by occlusion pressure; and a plurality of ball members having a predetermined diameter. The ball member is made of a material which cannot be deformed by subjecting occlusion pressure, and the ball member is embedded in the plastic material so as to be in a plane.

Abstract: A wax shaping tool of the present invention is a tool which is used in manufacturing an artificial denture model by a dental technician.

Abstract: A ball for ball game comprises a rubber hollow spherical bladder, a valve holder fixed to the tube for charging air into the tube, a valve member attached to the valve holder; a fabric layer covering the bladder surface and a leather layer. The fabric layer is composed of a plurality of equilateral quadrilateral pieces sewn together to form a sphere. The equilateral quadrilateral pieces each include two sheets of approximately trapezodial fabric pieces that are sewed together symmetrically at a central seam line. The equilateral quadrilaterla pieces are sewed together such that central seam lines of adjacent equilateral quadrilateral pieces fall at right angles to ech other. The fabric layer gives sphericity, dimensional stability and durability to the ball. The leather layer is adhered to the fabric layer directly or through a rubber based thin intermediate layer.

Abstract: According to the present invention, there is provided for an attachment for a dental prosthesis comprising: (a) a male member made of a rigid material provided at a retentive tooth or a dental root; and (b) a female member provided at the dental prosthesis and facing to the male member, wherein the female member has an elastic part made of an elastic material in order to grip at least an engaging portion of the male member, and the elastic part is formed as one body with an elastic lining layer made of an elastic material and being provided at an inner surface of the dental prosthesis to be in contact with an alveolus ridge. Whereby, the dental prosthesis can be stably and softly supported on the alveolus ridge.

Abstract: A wax shaping tool comprising a handle portion, a means for slidably supporting wax rod with a stopper at the front end thereof, a forming spatula portion in front of the handle portion for holding and flowing wax, a wax melter provided on the forming spatula portion, a heater, a wax feed controller for controlling the contact of wax rod with the wax melter by means of controlling the movement of the wax rod supporting means and/or wax rod and/or the stopper and/or the wax melter. The tool enables a wax shaping work to be carried out rapidly and efficiently without a fear of wax degradation, or wax rod deformation.

Abstract: In accordance with the present invention, there can be provided a denture base for a dental prosthesis comprising a body having an inner surface to be in contact with patient's alveolus ridge; a lining layer covering the inner surface of the body; and an adhesive agent for bonding the lining layer to the inner surface of the body; wherein the body is made of polymethyl methacrylate; the lining layer is made of a rubber-like resilient material comprising an olefin thermoplastic elastomer; and the adhesive agent contains a copolymer comprising an olefin and methyl methacrylate. The denture base has an advantage that adhesive force between the lining layer and the body is strong, and the lining layer has suitable hardness for supporting the dental prosthesis.

Abstract: A sound emitting ball has (a) a ball having an airtight bladder with an air injection valve, (b) a housing provided within the ball on the opposite side of the bladder with respect to the valve without interferring with the airtightness of the bladder, (c) a cover for concealing the housing, (d) a detector for detecting an application of external force to the ball, (e) a sound generator for generating a sound signal according to the signal from the detector, (f) a speaker for emitting sound according to the sound signal from the sound generator, and (g) a battery power source. The detector, sound generator, speaker, and battery power source are accommodated in the housing and the sum of the weights of the housing, cover, detector, sound generator, speaker, and battery power source are adjusted to a weight which does not substantially interfere with the impact resilience of the bladder and is substantially the same as the weight of the valve.

Abstract: An athletic ball comprising (a) a ball having an airtight bladder with an air injecting valve, (b) a housing provided with the ball on the opposite side of the valve without interfering the airtightness of the bladder, a detector for detecting an application of external force to the ball, an operation converter for converting the detected impact signal to a numerical information signal, a display for displaying the numerical information and/or for generating a sound according to the numerical information, and a battery power source; the converter, display and battery power source being accommodated in the housing, and the sum of the weights of all of the above elements being adjusted to the weight which does not substantially interfere the impact resilience of the bladder and is substantially the same as that of the valve.