US4257588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exercise bicycles
Assignee: ROADMASTER Corp A CORP OF
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Filing: 1979-06-28
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Granted: 1981-03-24
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Expires: 1999-06-28
Abstract
Abstract A dual-crank type upper body and arm exerciser attachment readily attachable to existing exerciser bicycles, and in which the drag brake for the arm exerciser comprises an incompressible sleeve of rubber or elastomeric material pressed against the crank arm shaft.
Inventors
- 👤 Jeffrey Ketchman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:41
CPC Classifications
A; A63; A63B; A63B22/00; A63B22/06; A63B22/0605; A63B22/0002; A63B22/0005; A63B22/001; A63B22/0012; A63B21/00; A63B21/012; A63B21/015; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20732; Y10T74/2078; Y10T74/20828; Y10T74/20834; Y10T74/20864
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
285 words
In an exerciser bicycle comprising a frame having a front fork head tube, a dual-crank type upper body and arm exerciser attachment removably connected to said head tube, said attachment comprising a tube having its lower end removably connected to said head tube, a pair of crank arms connected at one of their ends to opposite ends of a common shaft, rotary hand grips connected to the other ends of said arms, said arms being positioned along opposite sides of said bicycle and extending from said shaft in directions perpendicular thereto, means at said crank arm one ends and opposite shaft ends for connecting said crank arms to said shaft to extend from said shaft in either opposite directions or the same direction with respect to each other, a cylindrical member being affixed in a T-shaped arrangement to the upper end of said attachment tube, said shaft being positioned in said cylindrical member, spaced end bearings in said cylindrical member for opposite ends of said shaft, and a brake positioned in said cylindrical member for imposing a drag on said shaft, said brake comprising an elastomeric material in said cylindrical member between said bearings, and means for forcibly urging said material into contact with said shaft, said material comprising a thick sleeve of resilient material having a Poisson's ratio of about 0.5, said sleeve being disposed snug on said shaft to turn therewith between said bearings, said last mentioned means comprising a semi-cylindrical pressure plate positioned between said sleeve and cylindrical member, and means for manually varying the amount of force on said plate urging said plate into contact with said sleeve and said sleeve into forcible contact with said shaft to vary said drag.
Claim 2
Dependent Claim
285 words
In an exerciser bicycle comprising a frame having a front fork head tube, a dual-crank type upper body and arm exerciser attachment removably connected to said head tube, said attachment comprising a tube having its lower end removably connected to said head tube, a pair of crank arms connected at one of their ends to opposite ends of a common shaft, rotary hand grips connected to the other ends of said arms, said arms being positioned along opposite sides of said bicycle and extending from said shaft in directions perpendicular thereto, means at said crank arm one ends and opposite shaft ends for connecting said crank arms to said shaft to extend from said shaft in either opposite directions or the same direction with respect to each other, a cylindrical member being affixed in a T-shaped arrangement to the upper end of said attachment tube, said shaft being positioned in said cylindrical member, spaced end bearings in said cylindrical member for opposite ends of said shaft, and a brake positioned in said cylindrical member for imposing a drag on said shaft, said brake comprising an elastomeric material in said cylindrical member between said bearings, and means for forcibly urging said material into contact with said shaft, said material comprising a thick sleeve of resilient material having a Poisson's ratio of about 0.5, said sleeve being disposed snug on said shaft to turn therewith between said bearings, said last mentioned means comprising a semi-cylindrical pressure plate positioned between said sleeve and cylindrical member, and means for manually varying the amount of force on said plate urging said plate into contact with said sleeve and said sleeve into forcible contact with said shaft to vary said drag.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |