Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1979-02-28
1981-10-27
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264250, 264267, 264317, 264337, 273 73C, B29C 114, B29D 2302, B29D 2700
Patent
active
042973082
ABSTRACT:
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.
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Dunlop Limited
Lowe James B.
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