US5240247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racquet for ball games
Assignee: Head Sport GmbH
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Filing: 1991-07-15
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Granted: 1993-08-31
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Expires: 2011-07-15
Abstract
Abstract A racquet for ball games, and in particular, a tennis racquet, includes a grip (2) and a head with a striking surface, in which the head is arranged to rotate to a limited degree in relation to the grip (2) about the longitudinal axis (7) of the grip (2). Spring and damping elements are fitted between the grip (2) and the head, and specifically, spring elements (13) and damping elements (14) are arranged in axially spaced pairs in the direction of the longitudinal axis (7) in each of a plurality of recesses (12) extending in the direction of the longitudinal axis (7) of the grip (2, 10) between the grip (2) and the shaft (5, 6) of the head in order to enable effective spring and damping of the torsional and longitudinal vibrations of the racquet (1) in the grip region.
Inventors
- 👤 Henry Didier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:52
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/08; A63B60/00; A63B60/06; A63B60/08; A63B60/14; A63B60/32; A63B60/54; A63B60/10; A63B60/48
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A racquet for a ball game comprising: a grip portion overlying a shaft connected to a head having a striking surface, said grip and said shaft having a longitudinal axis, and wherein said head is rotatable to a limited degree about said longitudinal axis and relative to said grip; and further wherein said shaft is formed with at least one longitudinal recess extending substantially parallel to said longitudinal axis, with at least one spring element and at least /ne damping element located adjacent each other in said at least one recess, and in engagement with said grip.
Claim 2
Dependent Claim
97 words
A racquet for a ball game comprising: a grip portion overlying a shaft connected to a head having a striking surface, said grip and said shaft having a longitudinal axis, and wherein said head is rotatable to a limited degree about said longitudinal axis and relative to said grip; and further wherein said shaft is formed with at least one longitudinal recess extending substantially parallel to said longitudinal axis, with at least one spring element and at least /ne damping element located adjacent each other in said at least one recess, and in engagement with said grip.
Claim 3
Dependent Claim
32 words
The racquet according to claim 1 wherein each spring element and each damping element have a pair of lateral faces which lie in planes convergent in a direction toward said longitudinal axis.
Claim 4
Dependent Claim
82 words
The racquet according to claim 2 wherein said grip is formed with at least one face surface engaged by one of said pair of lateral faces of said spring element and one of said pair of lateral faces of said damping element, and wherein said at least one longitudinal recess is formed with another surface engaged by the other of said pair of lateral faces of said spring element and the other of said pair of lateral faces of said damping element.
Claim 5
Dependent Claim
44 words
A racquet according to claim 1, wherein said at least one spring element is comprised of an elastomeric material, and wherein said at least one damping element is comprised of synthetic rubber of a lesser Shore hardness than said at least one spring element.
Claim 6
Dependent Claim
30 words
A racquet according to claim 1, wherein said at least one spring element has an axial length less than a corresponding axial length of said at least one damping element.
Claim 7
Dependent Claim
32 words
A racquet according to claim 5, wherein a ratio of the length of said at least one spring element to the length of said at least one damping element is about 1:2.
Claim 8
Dependent Claim
30 words
A racquet according to claim 2, wherein a base angle of said pair of lateral faces of each said spring element and said damping element lies between 82° and 89.5°.
Claim 9
Dependent Claim
32 words
A racquet according to claim 1, wherein said at least one longitudinal recess has an axial length greater than a sum of the lengths of the spring and damper elements located therein.
Claim 10
Dependent Claim
49 words
A racquet according to claim 1, wherein said at least one spring element is made of a material having a hardness (Shore A) to 78 to 88, and wherein said at least one damping element is made of a material having a hardness (Shore A) of 50 to 60.
Claim 11
Dependent Claim
34 words
A racquet according to claim 1, wherein a spring and an adjacent damping element are located in axially spaced paired relationship at each of two axial ends of said at least one longitudinal recess.
Claim 12
Dependent Claim
29 words
A racquet according to claim 1, wherein said grip is connected to said shaft, only via said at least one spring element and said at least one damping element.
Claim 13
Dependent Claim
50 words
A racquet according to claim 3, wherein a shear-resistant adhesive is used to secure said at least one spring element and said at least one damper element to said at least one face surface of said grip to provide protection against axial shifting of the grip relative to the shaft.
Claim 14
Dependent Claim
36 words
A racquet according to claim 1, wherein said shaft and said grip are connected to one another by pins or screws to protect against axial shifting of said shaft and said grip relative to one another.
Claim 15
Dependent Claim
18 words
A racquet according to claim 13, wherein said pins or screws are elastic and are made of polyamide.
Claim 16
Dependent Claim
54 words
A racquet according to claim 13, wherein a sleeve is placed in apertures in the shaft and a locking pin is inserted in said sleeve and comes into contact with an inside wall of the sleeve in partial areas, said locking pin being held in openings in the grip so as to be immovable.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-30 | 1997-03-01 | 1997-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-30 | 2001-03-01 | 2001-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-30 | 2005-03-01 | 2005-08-31 | $7700.00 | Window Closed / Lapsed |