Patent US4231568A successfully refreshed from Google Patents.
US4231568A
Expired / Lapsed
US
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Exercise machine with spring-cam arrangement for equalizing the force required through the exercise stroke
Assignee: Individual
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Filing: 1979-01-29
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Granted: 1980-11-04
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Expires: 1999-01-29
Abstract
Abstract An exercise machine with a user-actuated force-applying member utilizes a spring to resist the physical force applied by the user. The physical force is applied to the spring through a cam arrangement which equalizes the force required throughout the exercise stroke.
Inventors
- 👤 Robert Q. Riley
- 👤 David L. Carey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:01
CPC Classifications
A; A63; A63B; A63B21/00; A63B21/15; A63B21/151; A63B21/154; A63B21/155; A63B21/02; A63B21/04; A63B21/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
In an exercise machine which includes a frame, a force-applying member carried by and movable with respect to said frame through an exercise stroke in response to physical force exerted thereon by a user, and spring means carried by said frame to resist the physical force applied by the user through said exercise stroke, the improvement comprising: force equalizing means, operatively associated with said spring means and said force-applying member, for equalizing the physical force required to move said force-applying member throughout said exercise stroke against the increased force required to elongate the spring means when said force-applying member is moved in the direction to elongate the spring means.
Claim 2
Dependent Claim
109 words
In an exercise machine which includes a frame, a force-applying member carried by and movable with respect to said frame through an exercise stroke in response to physical force exerted thereon by a user, and spring means carried by said frame to resist the physical force applied by the user through said exercise stroke, the improvement comprising: force equalizing means, operatively associated with said spring means and said force-applying member, for equalizing the physical force required to move said force-applying member throughout said exercise stroke against the increased force required to elongate the spring means when said force-applying member is moved in the direction to elongate the spring means.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |