US4752066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Footstep exerciser
Assignee: TSUNODA JITENSHA KK
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Filing: 1985-09-24
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Granted: 1988-06-21
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Expires: 2005-09-24
Abstract
Abstract A footstep exerciser comprises a base frame assembly to be installed on a floor, a crank shaft rotatably supported on the frame assembly and provided at the opposite ends thereof with a pair of crank pedals to be stepped by a user, a flywheel of magnetic material fixedly mounted on the crank shaft for rotation therewith in a vertical plane, a pair of vertically spaced movable permanent magnets arranged adjacent the flywheel to be moved toward and away from the flywheel in a vertical plane parallel with one face of the flywheel, a support mechanism mounted on a portion of the frame assembly for supporting thereon the permanent magnets in such a manner that the permanent magnets are opposed to the one face of the flywheel with a predetermined slight clearance when moved toward the flywheel, and an actuation device operatively connected to the support mechanism for moving the permanent magnets toward and away from the flywheel and for retaining the same in their moved positions.
Inventors
- 👤 Akira Housayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:57
CPC Classifications
A; A63; A63B; A63B21/00; A63B21/005; A63B21/0051; A63B22/00; A63B22/06; A63B22/0605; A63B21/22; A63B21/225; A63B23/00; A63B23/035; A63B23/04; A63B23/0476; Y; Y10; Y10S; Y10S482/00; Y10S482/903; Y10T; Y10T74/00; Y10T74/20; Y10T74/20396; Y10T74/20402; Y10T74/2042; Y10T74/20438
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
316 words
A footstep exerciser comprising: a base frame assembly suitable for installing on a floor; a crank shaft rotatably supported on said frame assembly and provided at the opposite ends thereof with a pair of user-operable crank pedals; an annular flywheel of magnetic material mounted on said crank shaft for rotation therewith in a vertical plane; a pair of vertically spaced movable permanent magnets adjacent an outer rim of said flywheel, said pair of magnets being movable toward and away from said flywheel in a vertical plane parallel with one side of said flywheel; a pair of laterally spaced stationary permanent magnets for applying a preload mounted on a portion of said frame assembly, wherein said stationary permanent magnets are positioned adjacent said one side of said flywheel with a predetermined slight clearance therefrom and one of said stationary permanent magnets is arranged so that its polarity is reversed with respect to the polarity of the other stationary permanent magnet; support means mounted on a portion of said frame assembly for supporting thereon said movable permanent magnets, one of said movable permanent magnets having its polarity reversed with respect to the polarity of the other movable permanent magnet, and said movable permanent magnets being positioned adjacent to said one side of said flywheel with a predetermined slight clearance therefrom when said magnets are moved toward said flywheel, said support means including means for adjusting the slight clearance between said movable permanent magnets and the one side of the flywheel; and actuating means operatively connected to said support means for moving said movable permanent magnets toward and away from said flywheel; whereby the magnets in each pair cooperate with each other of said pair to provide a magnetic flux in the form of a closed loop across the flywheel, the position of said magnets with respect to said flywheel determining the load to be overcome by the user.
Claim 2
Dependent Claim
316 words
A footstep exerciser comprising: a base frame assembly suitable for installing on a floor; a crank shaft rotatably supported on said frame assembly and provided at the opposite ends thereof with a pair of user-operable crank pedals; an annular flywheel of magnetic material mounted on said crank shaft for rotation therewith in a vertical plane; a pair of vertically spaced movable permanent magnets adjacent an outer rim of said flywheel, said pair of magnets being movable toward and away from said flywheel in a vertical plane parallel with one side of said flywheel; a pair of laterally spaced stationary permanent magnets for applying a preload mounted on a portion of said frame assembly, wherein said stationary permanent magnets are positioned adjacent said one side of said flywheel with a predetermined slight clearance therefrom and one of said stationary permanent magnets is arranged so that its polarity is reversed with respect to the polarity of the other stationary permanent magnet; support means mounted on a portion of said frame assembly for supporting thereon said movable permanent magnets, one of said movable permanent magnets having its polarity reversed with respect to the polarity of the other movable permanent magnet, and said movable permanent magnets being positioned adjacent to said one side of said flywheel with a predetermined slight clearance therefrom when said magnets are moved toward said flywheel, said support means including means for adjusting the slight clearance between said movable permanent magnets and the one side of the flywheel; and actuating means operatively connected to said support means for moving said movable permanent magnets toward and away from said flywheel; whereby the magnets in each pair cooperate with each other of said pair to provide a magnetic flux in the form of a closed loop across the flywheel, the position of said magnets with respect to said flywheel determining the load to be overcome by the user.
Claim 3
Dependent Claim
334 words
A footstep exerciser comprising: a base frame assembly suitable for installing on a floor; a crank shaft rotatably mounted on said frame assembly and provided at the opposite ends thereof with a pair of user-operable crank pedals; a rotary plate mounted on said crank shaft for rotation therewith in a vertical plane; an annular flywheel of magnetic material secured to one side of said rotary plate; a pair of vertically spaced movable permanent magnets adjacent an outer rim of said rotary plate, said pair of magnets being movable toward and away from said rotary plate in a vertical plane parallel with the other side of said rotary plate; a pair of laterally spaced stationary permanent magnets for applying a preload mounted on a portion of said frame assembly, wherein said stationary permanent magnets are positioned adjacent the other side of said rotary plate with a predetermined slight clearance therefrom and one of said stationary permanent magnets is arranged so that its polarity is reversed with respect to the polarity of the other stationary permanent magnet; support means mounted on a portion of said frame assembly for supporting thereon said movable permanent magnets, wherein said movable permanet magnets are positioned adjacent the other side of said rotary plate with a predetermined slight clearance therefrom when moved toward said rotary plate, and one of said movable permanent magnets is arranged so that its polarity is reversed with respect to the other movable permanent magnet, said support means including means for adjusting the slight clearance between said movable permanent magnets and said other side of said rotary plate; and actuation means operatively connected to said support means for moving said movable permanent magnets toward and away from said rotary plate; whereby the magnets in each pair cooperate with each other of said pair to provide a magnetic flux in the form of a closed loop across the flywheel, the position of said magnets with respect to said flywheel determining the load to be overcome by the user.
Claim 4
Dependent Claim
334 words
A footstep exerciser comprising: a base frame assembly suitable for installing on a floor; a crank shaft rotatably mounted on said frame assembly and provided at the opposite ends thereof with a pair of user-operable crank pedals; a rotary plate mounted on said crank shaft for rotation therewith in a vertical plane; an annular flywheel of magnetic material secured to one side of said rotary plate; a pair of vertically spaced movable permanent magnets adjacent an outer rim of said rotary plate, said pair of magnets being movable toward and away from said rotary plate in a vertical plane parallel with the other side of said rotary plate; a pair of laterally spaced stationary permanent magnets for applying a preload mounted on a portion of said frame assembly, wherein said stationary permanent magnets are positioned adjacent the other side of said rotary plate with a predetermined slight clearance therefrom and one of said stationary permanent magnets is arranged so that its polarity is reversed with respect to the polarity of the other stationary permanent magnet; support means mounted on a portion of said frame assembly for supporting thereon said movable permanent magnets, wherein said movable permanet magnets are positioned adjacent the other side of said rotary plate with a predetermined slight clearance therefrom when moved toward said rotary plate, and one of said movable permanent magnets is arranged so that its polarity is reversed with respect to the other movable permanent magnet, said support means including means for adjusting the slight clearance between said movable permanent magnets and said other side of said rotary plate; and actuation means operatively connected to said support means for moving said movable permanent magnets toward and away from said rotary plate; whereby the magnets in each pair cooperate with each other of said pair to provide a magnetic flux in the form of a closed loop across the flywheel, the position of said magnets with respect to said flywheel determining the load to be overcome by the user.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |