US4033583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tennis racket
Assignee: Individual
•
Filing: 1976-03-16
•
Granted: 1977-07-05
•
Expires: 1996-03-16
Abstract
Abstract A tennis racket or the like having a slip clutch in the handle of the racket. When a tennis ball strikes on or near the frame to the side of the tennis racket head, there is a tendency for the head of the racket to twist around a longitudinal axis extending through the handle of the racket. The slip clutch permits the head of the racket to rotate relative the handle of the racket to lessen the transmission of shock forces from the head of the racket to the arm of the user of the tennis racket.
Inventors
- 👤 Wendell A. Ehrhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:22
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/08; A63B60/00; A63B60/06; A63B60/08; A63B60/14; A63B60/22; A63B60/30; A63B60/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
153 words
A racket comprising: (a) a head portion having an open frame and strings positioned within the open frame, (b) a handle portion attached to said head portion, (1) said handle portion being formed of two parts with a friction clutch means therebetween, said friction clutch means being adjustable to vary the frictional contact between the two parts and permitting a variable degree of rotation of one part relative the other part to absorb shock action, (2) one part of the handle portion being connected to said head portion, (3) the second part of the handle portion being adapted to be grasped by the user of the racket, and (4) said friction clutch means being between said two handle parts, said clutch means being constructed and arranged to permit the head portion of the racket to rotate about the axis of the handle portion when a ball strikes the side of the racket head.
Claim 2
Dependent Claim
153 words
A racket comprising: (a) a head portion having an open frame and strings positioned within the open frame, (b) a handle portion attached to said head portion, (1) said handle portion being formed of two parts with a friction clutch means therebetween, said friction clutch means being adjustable to vary the frictional contact between the two parts and permitting a variable degree of rotation of one part relative the other part to absorb shock action, (2) one part of the handle portion being connected to said head portion, (3) the second part of the handle portion being adapted to be grasped by the user of the racket, and (4) said friction clutch means being between said two handle parts, said clutch means being constructed and arranged to permit the head portion of the racket to rotate about the axis of the handle portion when a ball strikes the side of the racket head.
Claim 3
Dependent Claim
94 words
The racket of claim 1 wherein the second part of the handle portion constitutes a sleeve surrounding the first part of the handle structure which is connected to the head of the racket, said first part of the handle portion being of a varied cross section along its length so that the sleeve means may be slid up and down along the first part of the handle portion to adjust the frictional contact between the two parts of the handle, said frictional clutch being the interface between the two parts of the handle structure.
Claim 4
Dependent Claim
45 words
The racket according to claim 2 wherein the first part of the handle structure includes a foam material covering which is compressed by the sleeve to assist in the adjustment of the frictional contact between the sleeve and the first part of the handle structure.
Claim 5
Dependent Claim
86 words
The racket according to claim 1 wherein the second part of the handle portion is a sleeve and the first part of the handle portion is an expandable cross-section structure fastened to the head of the racket, said expandable portion of the handle being composed of wedge elements which engage a cam surface to vary the effective cross-sectional size of the first part of the handle portion, and the friction clutch is the interface between the first part and the second part of the handle portion.
Claim 6
Dependent Claim
73 words
The racket according to claim 1 wherein the second part of the handle portion is a conventional racket handle and the first part of the handle portion of the racket is a portion of the head of the racket, and a disc-shaped friction element is positioned between said two handle portions, said disc-shaped element being the frictional clutch will permit the head of the racket to rotate relative the handle of the racket.
References Cited (Backward Citations)
US2044567A
Cited
US2225839A
Cited
GB710625A
Cited
DE1112435B
Cited
GB808614A
Cited
US3534960A
Cited
US3804413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |