US4423869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Games racket frame
Assignee: Dunlop Ltd
•
Filing: 1981-11-27
•
Granted: 1984-01-03
•
Expires: 2001-11-27
Abstract
Abstract A frame for a games racket comprises a hollow plastics moulding which is at least partially reinforced by means of a rigid member integrally moulded therewith. The rigid member can consist of a metal plate having perforations which, when the plate and the plastics material are moulded together, are penetrated by the plastics material, which sets therein to lock the plate to the moulding. The plate may, for example, extend over an area corresponding to the crown portion of the frame so as to provide for localized reinforcement, particularly, in the event of impact (e.g. when the racket is dropped on to a hard surface).
Inventors
- 👤 Robert C. Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:15
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/14; A63B49/10; A63B49/022; A63B49/12; A63B60/00; A63B2209/00; A63B60/50; Y; Y10; Y10S; Y10S273/00; Y10S273/07; Y10S273/23
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A frame for a games racket, said frame consisting of a hollow moulding made from a plastics material and a rigid member, said rigid member being integrally moulded with said plastics material and completely embedded therein so as to reinforce said hollow moulding in a region corresponding to the crown portion of said frame, said rigid member having a plurality of perforations the individual diameter of some of said perforations being non-uniform along their length whereby, when said rigid member is moulded integrally with said hollow plastics moulding, the plastics material penetrates said perforations and sets therein to lock said rigid member to said hollow moulding, said rigid member being of generally U-shaped channel section and being so positioned relative to said hollow moulding that the base of the U lies adjacent the strung area of the frame.
Claim 2
Dependent Claim
138 words
A frame for a games racket, said frame consisting of a hollow moulding made from a plastics material and a rigid member, said rigid member being integrally moulded with said plastics material and completely embedded therein so as to reinforce said hollow moulding in a region corresponding to the crown portion of said frame, said rigid member having a plurality of perforations the individual diameter of some of said perforations being non-uniform along their length whereby, when said rigid member is moulded integrally with said hollow plastics moulding, the plastics material penetrates said perforations and sets therein to lock said rigid member to said hollow moulding, said rigid member being of generally U-shaped channel section and being so positioned relative to said hollow moulding that the base of the U lies adjacent the strung area of the frame.
Claim 3
Dependent Claim
14 words
The frame of claim 1, wherein said rigid member is made from a metal.
Claim 4
Dependent Claim
13 words
The frame of claim 2, wherein said rigid member is made of aluminium.
Claim 5
Dependent Claim
14 words
The frame of claim 1, wherein said rigid member is made from an alloy.
Claim 6
Dependent Claim
26 words
The frame of claim 4, wherein said rigid member is made from an alloy selected from the group consisting of mild steel, stainless steel and brass.
Claim 7
Dependent Claim
16 words
The frame of claim 1, wherein said hollow moulding is made from a fibre-reinforced plastics material.
Claim 8
Dependent Claim
39 words
The frame of claim 6, wherein said hollow moulding is made from a thermosetting-plastics material reinforced with fibres selected from the group consisting of carbon fibres, glass fibres and a combination of said carbon fibres with said glass fibres.
References Cited (Backward Citations)
US1678637A
Cited
US3352566A
Cited
GB1295704A
Cited
FR2243001B2
Cited
US3986716A
Cited
US4119313A
Cited
US4203596A
Cited
US4194738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |