发明名称 Method of manufacturing games rackets
摘要 The invention relates to games racket frames which are made from reinforced plastics material and have a hollow construction. The particular construction and method of the invention enable a satisfactory hollow product to be made by an injection moulding technique instead of the more laborious technique of building a suitable reinforced hollow construction around a mandrel. The frame is a hollow injection moulding of reinforced thermoplastics material in which the walls (21A and 21B) at the outer and inner circumference of the head (21) are joined by support means (25) through which the stringing holes (23) pass. The support means are integrally formed during the moulding. The method of the invention involves the use of a fusible core (10) which is shaped to provide the desired moulding with support means and which is melted out after the moulding is formed.
申请公布号 US4297308(A) 申请公布日期 1981.10.27
申请号 US19790015912 申请日期 1979.02.28
申请人 DUNLOP LIMITED 发明人 POPPLEWELL, FRANK W.
分类号 A63B49/10;A63B51/00;B29B7/00;B29C33/52;B29C39/00;B29C39/10;B29C39/26;B29C39/38;B29C45/44;(IPC1-7):B29C1/14;B29D23/02;B29D27/00 主分类号 A63B49/10
代理机构 代理人
主权项
地址