GB1266531A - - Google Patents
Info
- Publication number
- GB1266531A GB1266531A GB36769A GB1266531DA GB1266531A GB 1266531 A GB1266531 A GB 1266531A GB 36769 A GB36769 A GB 36769A GB 1266531D A GB1266531D A GB 1266531DA GB 1266531 A GB1266531 A GB 1266531A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frame
- racket
- point
- load
- stringing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B49/00—Stringed rackets, e.g. for tennis
- A63B49/02—Frames
- A63B49/12—Frames made of metal
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
- A63B60/06—Handles
- A63B60/08—Handles characterised by the material
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Golf Clubs (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
Abstract
1,266,531. Steel tennis rackets. DUNLOP HOLDINGS Ltd. 31 Dec., 1969 [2 Jan., 1969], No. 367/69. Heading A6D. A tennis racket is made of hollow steel tube whose cross section is such that its maximum external dimension M, divided by the maximum wall thickness, WT, is at least 26 and the minimum external dimension, M', divided by the maximum wall thickness, WT, is at least 13. Preferably, also, the point H of the frame will not be displaced by more than 3/4" when the last 6" of the handle is clamped and a load of 50 1b. is applied to point L; the angular distortion of the head about the longitudinal axis is not more than 4‹ under a torque of 150 inch 1b. applied along the line YZ; the vertical displacement of point E of the frame is not more than 1 3/4" when the head of the racket to line FG is clamped and a load of 20 1b. is applied to point E; and the load/ deflection ratio at a deflection 1/10" is greater than 450 when the frame is gripped in a tension testing machine and I and J. The crosssectional shape of the tube may be elliptical, circular or rectangular and may be grooved in the middle portion to facilitate stringing. The racket frame is made from a length of tube filled with bitumen supporting material and bent into shape, the stringing groove lying on the outer edge of the logs. A series of string- ing apertures are drilled in the loop, the bitumen material is melted and drained, and a bridge piece (C) and braces (D) are brazed onto the frame loop and between the parallel ends of the frame respectively. The racket is completed by a leather-bound wooden handle and stringing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB36769 | 1969-01-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1266531A true GB1266531A (en) | 1972-03-08 |
Family
ID=9703165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36769A Expired GB1266531A (en) | 1969-01-02 | 1969-01-02 |
Country Status (7)
| Country | Link |
|---|---|
| BE (1) | BE743972A (en) |
| DE (1) | DE1965463A1 (en) |
| ES (1) | ES181710Y (en) |
| FR (1) | FR2027663A1 (en) |
| GB (1) | GB1266531A (en) |
| IE (1) | IE33885B1 (en) |
| NL (1) | NL6919679A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5076583A (en) * | 1990-08-21 | 1991-12-31 | Sportstech Industries (U.S. Tech) Inc. | Racket frame with circular cross section and variable thickness |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL190570C (en) * | 1978-05-05 | 1994-05-02 | Lely Nv C Van Der | Device for spreading granular and / or powdery material. |
| NL7810805A (en) * | 1978-10-31 | 1980-05-02 | Lely Nv C Van Der | DEVICE FOR SPREADING GRAIN AND / OR POWDER MATERIAL. |
-
1969
- 1969-01-02 GB GB36769A patent/GB1266531A/en not_active Expired
- 1969-12-16 IE IE1681/69A patent/IE33885B1/en unknown
- 1969-12-30 DE DE19691965463 patent/DE1965463A1/en active Pending
- 1969-12-31 ES ES1969181710U patent/ES181710Y/en not_active Expired
- 1969-12-31 BE BE743972D patent/BE743972A/xx unknown
- 1969-12-31 FR FR6945662A patent/FR2027663A1/fr not_active Withdrawn
- 1969-12-31 NL NL6919679A patent/NL6919679A/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5076583A (en) * | 1990-08-21 | 1991-12-31 | Sportstech Industries (U.S. Tech) Inc. | Racket frame with circular cross section and variable thickness |
Also Published As
| Publication number | Publication date |
|---|---|
| NL6919679A (en) | 1970-07-06 |
| DE1965463A1 (en) | 1970-07-16 |
| BE743972A (en) | 1970-05-28 |
| ES181710U (en) | 1973-04-16 |
| IE33885B1 (en) | 1974-11-27 |
| FR2027663A1 (en) | 1970-10-02 |
| IE33885L (en) | 1970-07-02 |
| ES181710Y (en) | 1974-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |