Process for the production of a ball game racket frame
AssigneeHead Sportgerate Gesellschaft m.b.H. & Co. OHG
InventorsHelmut Umlauft, Karl-Heinz Wager
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Abstract
A process for the production of a ball game racket frame, in particular a tennis racket, squash racket or badminton racket frame, with a head and a shaft, in which at least the head and/or the shaft is made of a fiber-reinforced plastic as a hollow body, an injectable matrix, optionally with a reinforcing fiber material and an inert gas under pressure, in particular N.sub.2, is injected into a mold to form the hollow space of the hollow body.
Claims18
A method for the production of a ball game racket frame having a head and a shaft wherein at least one of the head and shaft is made as a hollow fiber-reinforced plastic body, having a hollow space, utilizing a mold, comprising the steps of:
- (a) injecting a plastic matrix system with reinforcing fiber material and an inert gas under pressure into the mold to form the hollow space of the hollow body of the frame;
- (b) forming one part of the racket with a thicker section by controlling the temperature of at least one part of the mold to vary the wall thickness of the frame at that mold part;
- and then
- (c) allowing the frame to cool and then removing it from the mold.
A method for the production of a ball game racket frame having a head and a shaft wherein at least one of the head and shaft is made as a hollow plastic body, having a hollow space, utilizing a mold, comprising the steps of:
- (a) injectinng a plastic matrix system and an inert gas under pressure into the mold to form the hollow space of the hollow body of the frame;
- (b) controlling the temperature of at least one part of the mold to vary the wall thickness of the frame at that mold part, the lower the temperature of a part of the mold, the less the wall thickness at that part;
- and then
- (c) allowing the frame to cool, and then removing it from the mold.
Dependencies are inferred from the claim text.