US4531734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tennis practice device
Assignee: Individual
•
Filing: 1984-07-30
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Granted: 1985-07-30
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Expires: 2004-07-30
Abstract
Abstract A tennis practice device for indoor use has a swingable upright arm pivotally connected to a weighted base. A tennis ball is connected to the top of the arm, and movement of the arm is limited and dampened by two cushions. An elastic strap normally holds the arm against one of the cushions. In the arm, an elongated wire with a spring trunk is surrounded by lengths of tubing arranged in telescopic fashion. The arm is resilient and capable of whip-like movement, rendering the impact resistance presented by the ball against a racquet similar to the resistance of a ball in actual play. Simultaneously, the combination of the pivot means with the resilient nature of the arm permits the ball to escape the follow-through stroke of the racquet, yet quickly return to its normal position to allow the tennis player to repeat strokes in rapid succession.
Inventors
- 👤 Robert M. Herrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:45
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/0073; A63B69/0091
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
A device for the practice of hitting a ball, comprising: a support; an elongated arm; pivot means mounting the arm on the support for swinging movement; a ball secured to the arm remote from said pivot means; stop means carried by the support within the path of travel of the arm for limiting the extent of swinging movement of the arm; and elastic means interconnecting the arm and the support for yieldably biasing the arm toward one end of its swinging movement, a portion of said arm extending from the ball toward said pivot means being flexible rendering the same bendable in response to hitting the ball, said portion being tubular and surrounding an internal elongated wire member, said member being attached to a spring trunk in alignment therewith, said trunk including a spring rigidly secured to a pair of end elements.
Claim 2
Independent Claim
142 words
A device for the practice of hitting a ball, comprising: a support; an elongated arm; pivot means mounting the arm on the support for swinging movement; a ball secured to the arm remote from said pivot means; stop means carried by the support within the path of travel of the arm for limiting the extent of swinging movement of the arm; and elastic means interconnecting the arm and the support for yieldably biasing the arm toward one end of its swinging movement, a portion of said arm extending from the ball toward said pivot means being flexible rendering the same bendable in response to hitting the ball, said portion being tubular and surrounding an internal elongated wire member, said member being attached to a spring trunk in alignment therewith, said trunk including a spring rigidly secured to a pair of end elements.
Claim 3
Independent Claim
108 words
A device for the practice of hitting a ball, comprising: a support; an elongated arm; pivot means mounting the arm on the support for swinging movement; a ball secured to the arm remote from said pivot means; stop means carried by the support within the path of travel of the arm for limiting the extent of swinging movement of the arm; and elastic means interconnecting the arm and the support for yieldably biasing the arm toward one end of its swinging movement, said support comprising a generally U-shaped frame having an elongated bight and two upright legs, the upper end of each leg supporting one of said stops.
Claim 4
Independent Claim
108 words
A device for the practice of hitting a ball, comprising: a support; an elongated arm; pivot means mounting the arm on the support for swinging movement; a ball secured to the arm remote from said pivot means; stop means carried by the support within the path of travel of the arm for limiting the extent of swinging movement of the arm; and elastic means interconnecting the arm and the support for yieldably biasing the arm toward one end of its swinging movement, said support comprising a generally U-shaped frame having an elongated bight and two upright legs, the upper end of each leg supporting one of said stops.
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |