Patent US4417728A successfully refreshed from Google Patents.
US4417728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Training apparatus for racket sports
Assignee: ESSELTE STUDIUM AB
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Filing: 1980-05-06
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Granted: 1983-11-29
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Expires: 2000-05-06
Abstract
Abstract A rebound apparatus for practicing striking a ball with a racket. The apparatus has an elongated rectangular frame which is mounted on a base for pivotal adjustment about a horizontal axis. Mounted on the frame is a flexible material which is relatively loose along the width of the frame and relatively taut along the length of the frame. The upper end of the frame is curved out of the plane of the main portion of the frame, and this upper end supports a ball rebound surface. The flexible material may be secured at its upper end to the rebound surface. The length of the frame is adjustable. In use, a ball when hit by a racket will strike the flexible material, rebound upwardly against the ball rebound surface, and then rebound again in a direction back toward the player who hit the ball.
Inventors
- 👤 Eric Hay
- 👤 Anders Nordstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:21
CPC Classifications
A; A63; A63B; A63B63/00; A63B69/00; A63B69/0097; A63B2063/001; A63B2102/00; A63B2102/02; A63B2102/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
220 words
A training apparatus for racket sports such as tennis, squash, or the like comprising: (a) elongated frame means having two mutually parallel frame members each having upper, upper distal and lower ends, and a principal segment between said upper and lower ends, said members being curved at their upper ends; (b) a rigid rebound surface disposed across the width of said frame means at the upper distal ends of said frame members, said rebound surface being spaced vertically apart from and substantially parallel to a plane joining said principle segments; (c) a flexible material, having upper and lower edges and longitudinal edges perpendicular thereto, attached to said rigid rebound surface, extending loosely across the width of said frame, said flexible material being relatively taut along the length of said frame and attached to the lower ends of said frame members, said upper edge being disposed rearwardly of said lower edge; (d) horizontal support means connected to said frame means; (e) means disposing said frame means and thus the said flexible material at diffrent angles to said horizontal support means; whereby the kinetic energy of a ball struck against the flexible material will be partially absorbed, the ball caused to run upwardly and rearwardly and hit the rigid rebound surface and be deflected downwardly backby said rebound surface towards the player.
Claim 2
Dependent Claim
220 words
A training apparatus for racket sports such as tennis, squash, or the like comprising: (a) elongated frame means having two mutually parallel frame members each having upper, upper distal and lower ends, and a principal segment between said upper and lower ends, said members being curved at their upper ends; (b) a rigid rebound surface disposed across the width of said frame means at the upper distal ends of said frame members, said rebound surface being spaced vertically apart from and substantially parallel to a plane joining said principle segments; (c) a flexible material, having upper and lower edges and longitudinal edges perpendicular thereto, attached to said rigid rebound surface, extending loosely across the width of said frame, said flexible material being relatively taut along the length of said frame and attached to the lower ends of said frame members, said upper edge being disposed rearwardly of said lower edge; (d) horizontal support means connected to said frame means; (e) means disposing said frame means and thus the said flexible material at diffrent angles to said horizontal support means; whereby the kinetic energy of a ball struck against the flexible material will be partially absorbed, the ball caused to run upwardly and rearwardly and hit the rigid rebound surface and be deflected downwardly backby said rebound surface towards the player.
Claim 3
Dependent Claim
26 words
A training apparatus according to claim 1 further including a second rebound surface horizontally disposed a predetermined distance from said frame and extending the width thereof.
Claim 4
Dependent Claim
69 words
A training apparatus according to claim 1 wherein said frame includes a pair of retaining means each having two ends, having one of said ends thereof disposed on the said frame proximate to said curved end, the other end of said retaining means being removably affixed to said flexible material for retaining the longitudinal edges of said material close to the frame member to which said edge is adjacent.
Claim 5
Dependent Claim
90 words
A training apparatus according to claim 1 wherein said frame comprises: a. said two frame members being tubular, each tubular member having a telescoping member received therein, said telescoping member being movable to adjust the length of said frame; b. a generally U-shaped cross member having means disposed on the distal ends thereof for supporting said tubular members in parallel alignment; and c. said horizontal support means comprising a support portion affixed to said U-shaped cross member, said support portion maintaining said frame a predetermined distance above a support surface.
Claim 6
Dependent Claim
48 words
A training apparatus according to claim 4 wherein said cross member includes: (i) a central portion, (ii) a pair of end portions rotatably affixed to the ends of said central portion, and (iii) means for retaining said end portions in a fixed position relative to said central portion.
Claim 7
Dependent Claim
21 words
A training apparatus according to claim 4 wherein said support portion is adjustable for providing different distances above said support surface.
Claim 8
Dependent Claim
15 words
A training apparatus according to claim 1 wherein said flexible material is a canvas cloth.
Claim 9
Dependent Claim
22 words
A training apparatus according to claim 1 wherein said flexible material includes indicia thereon representing the field of play of said sport.
Claim 10
Dependent Claim
45 words
A training apparatus according to claim 1 further including a wind shield means affixed on said frame proximate said curved ends, said wind shield extending downwardly behind said flexible material in order to prevent the wind from impinging upon the rear of said flexible material.
Claim 11
Dependent Claim
41 words
A training apparatus according to claim 1 wherein said flexible material is provided with an extending portion which extends beyond the lower end of said frame for filling the space from the lower end of said frame to a support surface.
Claim 12
Dependent Claim
33 words
An apparatus of claim 1 wherein said mutually parallel frame members are adjustable in length and the longitudinal tautness of said flexible material is adjustable by adjusting the lengths of said frame members.
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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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |