US3921467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive system for cycle
Assignee: Individual
•
Filing: 1974-03-11
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Granted: 1975-11-25
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Expires: 1994-03-11
Abstract
Abstract A drive train for a cycle is provided wherein the drive train is located in the center of the cycle body along the longitudinal axis thereof. The drive train includes a primary sprocket and final sprocket with a tensioner sprocket therebetween. A secondary sprocket may be included between the primary and final sprocket to alter the gear ratios of the drive train.
Inventors
- 👤 Hideji Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:18
CPC Classifications
B; B62; B62K; B62K3/00; B62K3/005; B62K9/00; B62K9/02; B62M; B62M1/00; B62M1/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
In a cycle having a body, pedal means mounted on said body, and at least one rear drive wheel means the improvement comprising a drive means including: a. primary sprocket means mounted on said pedal means; b. final sprocket means mounted on said rear drive wheel means; c. chain means having an upper and lower portion coupling said primary and final sprocket means; and d. tensioner sprocket means mounted on said body comprising two adjustable sprocket wheels positioned between said primary and final sprocket means, one of said sprocket wheels engaging said upper portion of said chain means and the other of said sprocket wheels engaging the lower portion of said chain means, wherein said sprocket wheels can be adjusted to adjust the tension of said chain means; and, wherein said primary and tensioner sprocket means are positioned along the center line of said body.
Claim 2
Dependent Claim
145 words
In a cycle having a body, pedal means mounted on said body, and at least one rear drive wheel means the improvement comprising a drive means including: a. primary sprocket means mounted on said pedal means; b. final sprocket means mounted on said rear drive wheel means; c. chain means having an upper and lower portion coupling said primary and final sprocket means; and d. tensioner sprocket means mounted on said body comprising two adjustable sprocket wheels positioned between said primary and final sprocket means, one of said sprocket wheels engaging said upper portion of said chain means and the other of said sprocket wheels engaging the lower portion of said chain means, wherein said sprocket wheels can be adjusted to adjust the tension of said chain means; and, wherein said primary and tensioner sprocket means are positioned along the center line of said body.
Claim 3
Dependent Claim
46 words
The cycle of claim 1 further including secondary sprocket means positioned between said primary sprocket means and said final sprocket means wherein said chain means includes two chains, one engaging said primary and secondary sprocket means, and the other engaging the secondary and final sprocket means.
Claim 4
Dependent Claim
24 words
The cycle of claim 1 wherein said pedal means includes two pedals and wherein said primary sprocket means is positioned between said two pedals.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |