摘要:
A polyurethane covered golf ball is made by allowing the polyurethane cover stock material to partially cure in an open mold (10) and subsequently molding a golf ball product. The molding is done by first molding a smooth-surfaced golf ball product (32) in a smooth-walled fixed-pin mold (10) and then, in a second molding step, using a compression mold (50) to impart dimples onto the smooth-surfaced golf ball product. Between the two molding steps an intermediate curing step is employed. The initial curing time in an open mold and the intermediate curing time between the two molding steps is minimized through the use of a sufficient amount of catalyst, by keeping the smooth mold at an elevated temperature, or by using the fast-reacting chemical components.
摘要:
Ballon de sports ou de loisirs comprenant une couche externe (1, 10, 20) en mousse à peau intégrale, de polyuréthanne ou de polyuréthanne-urée, ayant une épaisseur totale de 1,5 à 5 mm environ, cette couche externe comportant un coeur microcellulaire (4, 14, 24) et une peau compacte de surface (3, 13,23) ayant une épaisseur de 0,5 à 2 mm environ; la structure du coeur comporte avantageusement des pores (8, 18, 28) très peu communicants, de préférence fermés, dans leur grande majorité . L'invention permet de réaliser des ballons de types variés, par exemple du type cousu main, du type laminé, du type surmoulé. L'invention concerne également un procédé d'obtention de tels ballons.
摘要:
A hollow injection moulded thermoplastics games racket frame comprising a head (21) and a shaft (20), the head (21) having integrally-formed internal supports (25) containing the stringing holes (23) and the moulding being polyurethane foam-filled. The foam filling is provided in two parts, a lighter filling (32) for the head and a denser filling (33) for the shaft. The shaft filling (33) is integrally-formed with a foam handle portion (34). The handle end of the shaft is preferably provided with moulded-in holes (31) through which filling (33) can flow during its foaming.
摘要:
A golf club (10) having a vibration damping device including a club head (12), a shaft (16) connected to the club head (12) having resonant frequencies over a predetermined range and a rod (20) disposed within the shaft (16) with a viscoelastic material (22) interposed between the shaft (16) and the rod (20). The rod (20) is flexible and has resonant frequencies over the same frequency range as the shaft (16) such that the shaft (16) and rod (20) vibrate out of phase with respect to each other and thereby deform the viscoelastic material (22) to damp vibrations in the shaft (16).
摘要:
A billiards table comprises a playing bed (12) of sandwich construction having a playing surface which mimics the bounce of slate for a billiards ball, an edge member (16) for said surface formed of moulded plastics and having a cushioned surface, and legs (15) fixed to the underside of the table. The edge member (16) incorporates channel formations (21) to receive the balls, which communicate with the pockets through said edge. The playing surface may be cloth covered (as is conventional) or may have a simulated cloth surface moulded on a plastic top layer.
摘要:
A billiards table comprises a playing bed (12) of sandwich construction having a playing surface which mimics the bounce of slate for a billiards ball, an edge member (16) for said surface formed of moulded plastics and having a cushioned surface, and legs (15) fixed to the underside of the table. The edge member (16) incorporates channel formations (21) to receive the balls, which communicate with the pockets through said edge. The playing surface may be cloth covered (as is conventional) or may have a simulated cloth surface moulded on a plastic top layer.
摘要:
A hollow injection moulded thermoplastics games racket frame (30) comprising a head (21) and a shaft (20), the head (21) having integrally-formed internal supports (25) containing the stringing holes (23) and the moulding being polyurethane foam-filled. The foam filling is provided in two parts, a lighterfilling (32) forthe head (21) and a denserfilling (33) for the shaft (20). The shaft filling (33) is integrally-formed with a foam handle portion (34). The handle end (34) of the shaft (20) is preferably provided with moulded-in holes (31) through which filling (33) can flow during its foaming.
摘要:
A golf ball comprises a core 1 composed of a centre 1a and an outer shell 1b, and a cover 2 covering the core 1, wherein the specific gravity of the centre la is in the range of from 0.2 to 1. The golf ball has an excellent flight distance and satisfies the other requirements of golf balls.