Patent US4898403A successfully refreshed from Google Patents.
US4898403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller ski
Assignee: Jenex Inc
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Filing: 1989-01-27
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Granted: 1990-02-06
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Expires: 2009-01-27
Abstract
Abstract A roller ski that uses a wheel including a stationary member, a rotating tire member, and a liquid between the two to provide viscous damping to rotation of the tire member. The roller ski tire member can increase in width from a hub portion to a crown portion to provide crown edge portions that deflect during edging.
Inventors
- 👤 Lennart B. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:39
CPC Classifications
A; A63; A63C; A63C17/00; A63C17/04; A63C17/045; A63C17/22; A63C17/223; A63C17/226
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
205 words
A roller ski comprising: an elongated base member and two wheels rotatably mounted at opposite ends of said base member by respective axles, one said wheel including a stationary member that is stationary with respect to said base member and a tire member that is mounted for rotation with respect to said stationary member, said tire member including a hub and an elastomeric tire mounted on said hub, said stationary member and said tire member having a respective stationary surface and a respective rotating surface that each partially define a chamber, said wheel including a liquid in said chamber to provide viscous damping to rotation of said tire member, said liquid being sufficiently viscous to provide resistance for retarding rotation of the wheel, the resistance increasing as a function of the rotational speed of the wheel, thereby acting to reduce the terminal velocity of the roller ski, wherein said stationary member includes an elongated spindle and said hub includes said rotating surface, said spindle having an outer substantially cylindrical surface forming said stationary surface and said hub having an inner substantially cylindrical surface forming said rotating surface, said outer cylindrical surface and said inner cylindrical surface facing each other and having a predetermined spacing therebetween.
Claim 2
Dependent Claim
205 words
A roller ski comprising: an elongated base member and two wheels rotatably mounted at opposite ends of said base member by respective axles, one said wheel including a stationary member that is stationary with respect to said base member and a tire member that is mounted for rotation with respect to said stationary member, said tire member including a hub and an elastomeric tire mounted on said hub, said stationary member and said tire member having a respective stationary surface and a respective rotating surface that each partially define a chamber, said wheel including a liquid in said chamber to provide viscous damping to rotation of said tire member, said liquid being sufficiently viscous to provide resistance for retarding rotation of the wheel, the resistance increasing as a function of the rotational speed of the wheel, thereby acting to reduce the terminal velocity of the roller ski, wherein said stationary member includes an elongated spindle and said hub includes said rotating surface, said spindle having an outer substantially cylindrical surface forming said stationary surface and said hub having an inner substantially cylindrical surface forming said rotating surface, said outer cylindrical surface and said inner cylindrical surface facing each other and having a predetermined spacing therebetween.
Claim 3
Dependent Claim
38 words
The roller ski of claim 1 wherein said one wheel includes sealed bearings provided between said stationary surface and said rotating surface to provide said rotation and provide a seal between said rotating surface and said stationary surface.
Claim 4
Dependent Claim
25 words
The roller ski of claim 2 wherein a said bearing has a circumferential surface in press-fit engagement with a facing circumferential surface of said spindle.
Claim 5
Dependent Claim
20 words
The roller ski of claim 1 wherein the spacing between said surfaces is greater than 0.04" and less than 0.2".
Claim 6
Dependent Claim
24 words
The roller ski of claim 1 wherein said tire member is made of elastomeric material having a Shore Scale A durometer greater than 55.
Claim 7
Dependent Claim
19 words
The roller ski of claim 5 wherein said elastomeric material has a Shore Scale A durometer greater than 65.
Claim 8
Dependent Claim
11 words
The roller ski of claim 1 wherein said liquid is silicone.
Claim 9
Dependent Claim
17 words
The roller ski of claim 1 wherein said liquid has a viscosity between 1,000 and 10,000 centistokes.
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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |