Patent US4483532A successfully refreshed from Google Patents.
US4483532A
Expired / Lapsed
US
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Exercise machine
Assignee: SECOND CENTURY FARMS Inc
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Filing: 1980-06-16
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Granted: 1984-11-20
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Expires: 2000-06-16
Abstract
Abstract An exericse machine primarily used in exercising and strengthening muscles and ligaments not normally affected by the standard dynamic and/or isometric approaches. The machine causes the user to work against a centrifugally operated brake which increases the resistance to movement as the rate of movement increases. A horizontally disposed lever including a stirrup is rotated about a vertical shaft by the foot and leg of a user, and the shaft is functionally connected to a speed increasing mechanism and its rate of rotation is regulated by a centrifugal brake. The amount of effort being expended to overcome the brake resistance is displayed by a simple linkage from the brake mechanism to an easily visible indicator.
Inventors
- 👤 Roger C. Sparks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:11
CPC Classifications
A; A63; A63B; A63B21/00; A63B21/012; A63B21/015; A63B22/00; A63B22/0048; A63B22/0061; A63B22/14; A63B23/00; A63B23/035; A63B23/04; A63B23/0482; A63B2208/00; A63B2208/02; A63B2208/0204
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
An exercise machine for strengthening the lateral and medial muscles adjacent the knee comprising: framework means supporting a platform in a stable condition, crank means rotatable through full revolutions when in use including a crank arm and a stirrup mounted to the framework means adjacent the platform such that a person standing on the platform may comfortably operate the crank means with one foot, rotatable vertical shaft means extending vertically downward from the crank means, through the upper portion of the framework means and terminating adjacent the lower portion of the framework means, whereby said crank means is operated in a repetitive rotatable motion and brake means automatically variably resisting rapid rotation of the shaft means.
Claim 2
Dependent Claim
116 words
An exercise machine for strengthening the lateral and medial muscles adjacent the knee comprising: framework means supporting a platform in a stable condition, crank means rotatable through full revolutions when in use including a crank arm and a stirrup mounted to the framework means adjacent the platform such that a person standing on the platform may comfortably operate the crank means with one foot, rotatable vertical shaft means extending vertically downward from the crank means, through the upper portion of the framework means and terminating adjacent the lower portion of the framework means, whereby said crank means is operated in a repetitive rotatable motion and brake means automatically variably resisting rapid rotation of the shaft means.
Claim 3
Dependent Claim
43 words
An exercise machine as in claim 1, wherein the brake means comprise a drum and at least one brake pad pivotally mounted upon a lever which presses the pad against the drum with greater force when the vertical shaft means rotates more rapidly.
Claim 4
Dependent Claim
24 words
An exercise machine as in claim 1 and further including means to indicate the relative work being done by the user of the machine.
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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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |