US 5,175,919 AGranted

Method for manufacturing a racket frame

OwnerKun-Nan Loinventor

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method for manufacturing a racket frame includes the steps of making a metal part having at least one joint end formed with a groove; covering the joint end of the metal part with a layer containing glass fibers to serve as an electrical insulating layer; making a preformed plastic part by wrapping a resin saturated carbon fiber material around a tube unit and by providing at least one end portion in the tube unit which has a wrapping layer thinner than that of the remaining portion of the tube unit to serve as a joint end; folding the end portion of the tube unit to seal the tube unit; inserting the folded end portion of the tube unit into the groove; wrapping and fastening the joint end of the metal part and the plastic part adjacent to the joint end of the tube unit with a resin saturated carbon fiber layer; forming and heating the metal part and the preformed plastic part in a mold; and supplying a compressed air into the tube unit to create a predetermined pressurizing force during the forming and heating step.

Claims3

Dependent claims

A method for manufacturing a racket frame comprising the steps of:

making a metal part having at least one joint end formed with an engaging groove;
covering said joint end of said metal part with a layer containing glass fibers to serve as an electrical insulating layer;
making a preformed plastic part by wrapping a resin saturated carbon fiber material around a tube means and by providing at least one end portion in said tube means which has a wrapping layer thinner than that of the remaining portion of said tube means in order to serve as a joint end;
folding said end portion of said tube means to seal said tube means;
inserting said folded end portion of said tube means into said engaging groove of said joint end of said metal part;
wrapping and fastening said joint end of said metal part and said plastic part adjacent to said joint end of said tube means with a resin saturated carbon fiber layer;
forming and heating said metal part and said preformed plastic part in a mold;
and
supplying a compressed air into said tube means to create a predetermined pressurizing force during forming and heating said metal part and said preformed plastic part.

6 more elements

Dependencies are inferred from the claim text.