US4099717A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable tension tennis racket
Assignee: Individual
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Filing: 1977-05-11
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Granted: 1978-07-11
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Expires: 1997-05-11
Abstract
Abstract A game racket with adustable string tension including a vertically movable tension bar positioned between the throat and handle sections, perpendicular to the plane of the racket, which engages directly to a loop extending below a main string retaining bar by an integral hook. The position of the tension bar and consequently the string tension are varied by rotating an interconnecting tension ring which traverses parallel threaded sections of the outer surfaces of the neck, and which is maintained at particular position by an abutting locking ring.
Inventors
- 👤 Bernard R. Sacks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:37
CPC Classifications
A; A63; A63B; A63B51/00; A63B51/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
360 words
A game racket apparatus wherein said racket includes a head portion for carrying main and cross strings, an open throat portion, a fixed yoke in said open throat portion, a handle portion for gripping by the player and having means for adjusting string tension comprising: a threaded segment machined in the outer surfaces of said throat portion of the racket; a tension ring, threaded on a portion of its inner circumferential surface, encircling and engaging said threaded segment of the outside of said throat portion, and being adjustable along the vertical length of the threaded segment of said throat by rotating said tension ring; a recessed track, cut into the unthreaded portion of the inner circumferential surface of said tension ring; a tension bar situated in said open throat portion perpendicular to the plane of said racket; said tension bar having at its ends graphite pads which engage said recessed track; said tension bar being able to slide freely on the recessed track of said tension ring, to maintain its spatial orientation perpendicular to the plane of said racket and simultaneously to move in a vertical direction along the threaded length of said throat, depending on the direction of the rotation of said tension ring; an upwardly extending hook integrally formed and coplanar with said tension bar; a main string retaining bar situated in said throat which receives the looped ends of said main strings and which is capable of vertical movement within the throat area between said yoke and said tension bar; a downwardly extending eye, integrally formed with said main string retaining bar, which engages said upwardly extending hook; a threaded locking ring which engages said threaded segment of the throat portion directly above said tension ring and is rotated until it comes into direct contact with said tension ring to lock said tension ring in position; a plurality of notches cut into the exterior circumferential surface of said tension ring to permit its rotation by a wrench; a rotation of said tension ring resulting in a vertical movement of said tension bar and said main string retaining bar, resulting in a change in tension on said strings.
Claim 2
Dependent Claim
360 words
A game racket apparatus wherein said racket includes a head portion for carrying main and cross strings, an open throat portion, a fixed yoke in said open throat portion, a handle portion for gripping by the player and having means for adjusting string tension comprising: a threaded segment machined in the outer surfaces of said throat portion of the racket; a tension ring, threaded on a portion of its inner circumferential surface, encircling and engaging said threaded segment of the outside of said throat portion, and being adjustable along the vertical length of the threaded segment of said throat by rotating said tension ring; a recessed track, cut into the unthreaded portion of the inner circumferential surface of said tension ring; a tension bar situated in said open throat portion perpendicular to the plane of said racket; said tension bar having at its ends graphite pads which engage said recessed track; said tension bar being able to slide freely on the recessed track of said tension ring, to maintain its spatial orientation perpendicular to the plane of said racket and simultaneously to move in a vertical direction along the threaded length of said throat, depending on the direction of the rotation of said tension ring; an upwardly extending hook integrally formed and coplanar with said tension bar; a main string retaining bar situated in said throat which receives the looped ends of said main strings and which is capable of vertical movement within the throat area between said yoke and said tension bar; a downwardly extending eye, integrally formed with said main string retaining bar, which engages said upwardly extending hook; a threaded locking ring which engages said threaded segment of the throat portion directly above said tension ring and is rotated until it comes into direct contact with said tension ring to lock said tension ring in position; a plurality of notches cut into the exterior circumferential surface of said tension ring to permit its rotation by a wrench; a rotation of said tension ring resulting in a vertical movement of said tension bar and said main string retaining bar, resulting in a change in tension on said strings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |