Patent US3924853A successfully refreshed from Google Patents.
US3924853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tennis practice device
Assignee: Individual
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Filing: 1974-09-19
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Granted: 1975-12-09
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Expires: 1994-09-19
Abstract
Abstract A tennis practice device having an upright member. The upright member is provided with a horizontally extending arm attached intermediate its ends to the upper end of the upright member. One of the ends of the arm is provided with a planar ball rebound surface and the other end of the arm is provided with a substantially vertical and pivotally attached, rod member. The rod is attached intermediate its ends to the end of the arm. A ball is attached to the upper end of the rod and a counter weight is attached to the lower end of the rod. The distance from the pivot point of the rod to the ball is substantially equal to the distance from the pivot point of the rod to the ball rebound surface. Mounted on the other end of the arm near the pivot point and adjacent the lower end of the rod is a pair of friction fingers for releasably engaging the rod for holding the rod substantially vertical. The rod is released by the fingers when the ball is struck towards the rebound surface and the rod is grasped by the fingers after the ball hits the rebound surface and returns to a substantially vertical position.
Inventors
- 👤 Harold F Schleeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:10
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/0073; A63B69/0091
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
233 words
A tennis practice device comprising an upright support means, means positioning said upright support means relative a fixed surface, a rebound surface means being positioned on the upper end of the upright support means, one end of an arm means being affixed to the upright support means, a mounting rod means being pivotally affixed adjacent one of its ends by a pivot pin to the opposite end of the arm means, a ball being positioned on the opposite end of said mounting rod means, a straight line distance from the pivot pin to the ball being substantially equal to the distance from the pivot pin to the rebound surface means, releasable means grasping the mounting rod in the vicinity of said pivot pin to hold the mounting rod means in a first position with the ball spaced away from the rebound surface, said mounting rod means being pivotable to move said ball from said first position to a second position where the ball engages the rebound surface, said mounting rod means when moved from said first position to said second position being released by said releasable means, said mounting rod means not being counterbalanced by a spring means when it moves from said first position to said second position, and said releasable means reengages said mounting rod means when the mounting rod means rebounds back from its second position to its first position.
Claim 2
Dependent Claim
233 words
A tennis practice device comprising an upright support means, means positioning said upright support means relative a fixed surface, a rebound surface means being positioned on the upper end of the upright support means, one end of an arm means being affixed to the upright support means, a mounting rod means being pivotally affixed adjacent one of its ends by a pivot pin to the opposite end of the arm means, a ball being positioned on the opposite end of said mounting rod means, a straight line distance from the pivot pin to the ball being substantially equal to the distance from the pivot pin to the rebound surface means, releasable means grasping the mounting rod in the vicinity of said pivot pin to hold the mounting rod means in a first position with the ball spaced away from the rebound surface, said mounting rod means being pivotable to move said ball from said first position to a second position where the ball engages the rebound surface, said mounting rod means when moved from said first position to said second position being released by said releasable means, said mounting rod means not being counterbalanced by a spring means when it moves from said first position to said second position, and said releasable means reengages said mounting rod means when the mounting rod means rebounds back from its second position to its first position.
Claim 3
Dependent Claim
29 words
The tennis practice device of claim 1 wherein said releasable means being a spring clip with two opposed spring finger means adapted to releasably grasp said mounting rod means.
Claim 4
Dependent Claim
19 words
The tennis practice device of claim 2 wherein said means positioning said upright support means is a base stand.
Claim 5
Dependent Claim
24 words
The tennis practice device of claim 2 wherein said means positioning said upright support means is a pointed end on the upright support means.
Claim 6
Dependent Claim
51 words
The tennis practice device of claim 2 wherein said mounting rod means has an offset portion near the end with said ball positioned thereon whereby the ball is positioned offset from the longitudinal axis of said mounting rod means, and said axis contains said pivot point for said mounting rod means.
Claim 7
Dependent Claim
44 words
The tennis practice device of claim 5 wherein said mounting rod means is provided with a weight means positioned on said mounting rod means on the end of said rod means opposite from the end of said rod means having the ball positioned thereon.
Claim 8
Dependent Claim
21 words
The tennis practice device of claim 2 wherein said rebound surface being a flat surface against which said ball can bounce.
Claim 9
Dependent Claim
21 words
The tennis practice device of claim 2 wherein said ball being releasably positioned on the end of said mounting rod means.
References Cited (Backward Citations)
US2713487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |