US4248448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bicycle enabling a substantially full length prone riding position
Assignee: Individual
•
Filing: 1979-06-27
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Granted: 1981-02-03
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Expires: 1999-06-27
Abstract
Abstract A bicycle having a frame extended rearwardly and beyond the rear wheel of the bicycle provided in the extended portion with a pedal crank driven sprocket connected by an endless drive chain with a sprocket gear carried by the rear wheel, the extended portion being in one form of the invention an integral part of the frame, or being in a modified form of the invention an accessory unit separably attachable to the conventional frame of a bicycle, in which modified form the sprocket gear is connectible by the drive chain, at the election of the rider, with either the pedal crank driven sprocket in the accessory unit or with the normal pedal crank driven sprocket in the conventional frame.
Inventors
- 👤 Igor Dmitrowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:11
CPC Classifications
B; B62; B62K; B62K3/00; B62K3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
A rear wheel drive unit removably attachable as an accessory to the rear of the frame of a bicycle that has a rearwardly extending fork supporting an axle upon which axle a rear drive wheel carrying a chain driven sprocket gear is mounted; the unit comprising a crankshaft sleeve, a pedal crank driven sprocket supported by the sleeve, elongated truss means fixed at one end to the sleeve and adapted at its other end to be removably attached to a rear portion of the frame of the bicycle so as to support the sleeve rearwardly of and beyond the rear drive wheel, the pedal crank driven sprocket being adapted for driving engagement by means of an endless drive chain with the sprocket gear, wherein the elongated truss means includes an elongated truss member fixed at one end to the sleeve and having at its opposite end means for removably mounting it to the frame; and the truss means further includes a pair of elongated truss elements, each element of the pair being fixed at one end to the sleeve and having at its opposite end means for removably supporting it on the axle of the rear drive wheel.
Claim 2
Dependent Claim
198 words
A rear wheel drive unit removably attachable as an accessory to the rear of the frame of a bicycle that has a rearwardly extending fork supporting an axle upon which axle a rear drive wheel carrying a chain driven sprocket gear is mounted; the unit comprising a crankshaft sleeve, a pedal crank driven sprocket supported by the sleeve, elongated truss means fixed at one end to the sleeve and adapted at its other end to be removably attached to a rear portion of the frame of the bicycle so as to support the sleeve rearwardly of and beyond the rear drive wheel, the pedal crank driven sprocket being adapted for driving engagement by means of an endless drive chain with the sprocket gear, wherein the elongated truss means includes an elongated truss member fixed at one end to the sleeve and having at its opposite end means for removably mounting it to the frame; and the truss means further includes a pair of elongated truss elements, each element of the pair being fixed at one end to the sleeve and having at its opposite end means for removably supporting it on the axle of the rear drive wheel.
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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |