One piece molded games racket
AssigneeDunlop Limited
InventorFrank W. Popplewell
Life of this patent
Estimating the term…
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 supports (25) through which the stringing holes (23) pass. The supports are integrally formed during the moulding.
Claims15
A games racket frame comprising a head and a shaft, in which at least said head is in the form of a hollow injection moulding of thermoplastics material reinforced with short filament reinforcing material, said moulding having walls formed by a first wall portion which lies at an outer circumference of said head, a second wall portion which lies at an inner circumference of said head and sidewall portions which connect with said first and second wall portions to complete the walls of the head of said frame, said first wall portion being connected to said second wall portion by an internal support means, said head having holes for stringing and said stringing holes passing through said internal support means, said moulding, including said internal support means, being an integrally-formed, seamless construction.
A games racket frame comprising a head and a shaft, in which at least said head is in the form of a hollow injection moulding of thermoplastics material reinforced with short, discrete lengths of fiber, said moulding having walls formed by a first wall portion which lies at an outer circumference of said head, a second wall portion which lies at an inner circumference of said head and sidewall portions which connect with said first and second wall portions to complete the walls of the head of said frame, said first wall portion being connected to said second wall portion by an internal support means, said head having holes for stringing and said stringing holes passing through said internal support means, said moulding, including said internal support means, being an integrally-formed seamless construction.
A games racket frame comprising a head and a shaft, in which at least said head is in the form of a hollow injection moulding of thermoplastics material reinforced with short filament reinforcing material, said moulding having walls formed by a first wall portion which lies at an outer circumference of said head, a second wall portion which lies at an inner circumference of said head and sidewall portions which connect with said first and second wall portions to complete the walls of the head of said frame, said first wall portion being connected to said second wall portion by an internal support means in the form of a centrally disposed row of seamless hollow pillars, said head having holes for stringing and said stringing holes passing through said internal support means, said moulding, including said internal support means, being an integrally-formed, seamless construction, said frame having a rectangular transverse sectional shape and the outer face of the first wall portion of said frame containing a groove or channel for recessing strings used with the racket frame.
Dependencies are inferred from the claim text.