US4182510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exercise shoe sit-up apparatus
Assignee: Individual
•
Filing: 1978-08-21
•
Granted: 1980-01-08
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Expires: 1998-08-21
Abstract
Abstract A foot restraining device for use during sit-up exercises. A rectangular platform which is tilted downward at a predetermined angle from its rear edge to its front edge is provided at its front edge with upwardly projecting, spaced apart jaws designed to straddle the bottom edge of a room door. A strap is used to bind the user's foot to the platform so that as he performs a sit-up, his foot is prevented from rising upwardly.
Inventors
- 👤 Robert C. Lundell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:26
CPC Classifications
A; A63; A63B; A63B23/00; A63B23/02; A63B23/0205; A63B23/0211; A63B21/00; A63B21/16; A63B21/1618; A63B21/1654
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
A foot restraining device for use during sit-up exercises comprising: (a) a platform member having a front edge, a rear edge and two generally parallel longitudinally extending side portions integrally formed therewith and projecting generally perpendicular thereto, said side portions being higher proximate said rear edge than at said front edge, such that said platform member is inclined upward by a predetermined angle from said front edge to said rear edge when said side portions are resting on a floor; (b) first and second parallel and spaced apart ribs integrally formed with and extending upward from said platform member proximate said front edge thereof for engaging the bottom edge of a door on opposed sides thereof; (c) a pair of slots formed through said platform member and extending parallel to said side portions; and (d) a strap passing through said pair of slots for engaging the bridge of a user's foot to bind said foot to said platform member with the heel and ball of said foot resting on said platform member.
Claim 2
Dependent Claim
172 words
A foot restraining device for use during sit-up exercises comprising: (a) a platform member having a front edge, a rear edge and two generally parallel longitudinally extending side portions integrally formed therewith and projecting generally perpendicular thereto, said side portions being higher proximate said rear edge than at said front edge, such that said platform member is inclined upward by a predetermined angle from said front edge to said rear edge when said side portions are resting on a floor; (b) first and second parallel and spaced apart ribs integrally formed with and extending upward from said platform member proximate said front edge thereof for engaging the bottom edge of a door on opposed sides thereof; (c) a pair of slots formed through said platform member and extending parallel to said side portions; and (d) a strap passing through said pair of slots for engaging the bridge of a user's foot to bind said foot to said platform member with the heel and ball of said foot resting on said platform member.
Claim 3
Dependent Claim
35 words
The foot restraining device as in claim 1 and further including: (a) first and second longitudinally extending spaced reinforcing ribs formed on the underside of said platform member and extending parallel to said side portions.
Claim 4
Dependent Claim
17 words
Apparatus as in claim 2 wherein said foot restraining device is molded from a thermosetting plastic material.
Claim 5
Dependent Claim
53 words
Apparatus as in claim 3 wherein the width of said platform member is between four inches and five inches, the length of said platform member is between thirteen inches and fourteen inches, and the height of said platform member is about 0.25 inches greater at its rear edge than at its front edge.
References Cited (Backward Citations)
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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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |