Patent US5039121A successfully refreshed from Google Patents.
US5039121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tri-skater
Assignee: HARDIN RICK L 2315 OAK DRIVE STEILACOOM WASHINGTON 98388
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Filing: 1989-10-11
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Granted: 1991-08-13
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Expires: 2009-10-11
Abstract
Abstract A three-wheeled vehicle having no driving connection to the wheels is powered by side-to-side forces applied by the operator to a pair of foot boards, each of which has a castered rear wheel having a pivot axis that is inclined with respect to the vertical. The forward ends of the foot boards are connected to a vertical steering head supporting a single front wheel. In one embodiment, the distance between the foot boards may be varied to suit riders of different sizes by changing the effective length of a crossmember rigidly interconnecting the footboards.
Inventors
- 👤 Donovan A. Holter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:17
CPC Classifications
B; B62; B62M; B62M1/00; B62M1/24; B62K; B62K3/00; B62K3/002; B62K5/00; B62K5/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
A three-wheeled occupant-propelled vehicle comprising a rigid frame, a steering fork pivotally mounted in said frame for rotation abut a steering axis, a front wheel supported by said steering fork, a pair of footboards extending rearwardly from said frame, and a pair of rear wheels, each attached at the rear of a respective one of said footboards by means of a swivel caster having a pivot axis inclined forwardly with respect to the vertical, and a crossmember connected between said footboards, so as to prohibit relative movement therebetween, wherein said frame comprises a steering tube and a pair of frame subassemblies connected thereto by means of quick-disconnect fasteners, each of said footboards being connected to a respective one of said frame subassemblies, wherein said crossmember has a series of alternative connecting points so that its effective length, and consequently the spread of the footboards, may be altered, wherein said crossmember is pivotally connected to one of said footboard struts, and further comprising a bracket connected to the other of said struts, said bracket defining a recess for receiving one end of said crossmember, and having means for securing said crossmember therein.
Claim 2
Dependent Claim
191 words
A three-wheeled occupant-propelled vehicle comprising a rigid frame, a steering fork pivotally mounted in said frame for rotation abut a steering axis, a front wheel supported by said steering fork, a pair of footboards extending rearwardly from said frame, and a pair of rear wheels, each attached at the rear of a respective one of said footboards by means of a swivel caster having a pivot axis inclined forwardly with respect to the vertical, and a crossmember connected between said footboards, so as to prohibit relative movement therebetween, wherein said frame comprises a steering tube and a pair of frame subassemblies connected thereto by means of quick-disconnect fasteners, each of said footboards being connected to a respective one of said frame subassemblies, wherein said crossmember has a series of alternative connecting points so that its effective length, and consequently the spread of the footboards, may be altered, wherein said crossmember is pivotally connected to one of said footboard struts, and further comprising a bracket connected to the other of said struts, said bracket defining a recess for receiving one end of said crossmember, and having means for securing said crossmember therein.
Claim 3
Dependent Claim
28 words
The invention of claim 1 wherein said pivot axis is inclined forwardly at angle from the vertical, said angle being in the range of 1° to 50° .
Claim 4
Dependent Claim
28 words
The invention of claim 1, wherein said pivot axis is inclined forwardly at angle from the vertical, said angle being in the range of 10° to 50° .
Claim 5
Dependent Claim
23 words
The invention of claim 1, wherein said pivot axis is inclined forwardly at angle from the vertical, said angle being about 20° .
References Cited (Backward Citations)
US210435A
Cited
US887812A
Cited
US2980437A
Cited
US4076270A
Cited
US4087107A
Cited
US4071261A
Cited
US4047732A
Cited
US4088338A
Cited
US4123079A
Cited
US4165093A
Cited
US4526390A
Cited
FR2544621A1
Cited
US4540192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |