US3803933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear shift device particularly for bicycles
Assignee: Individual
•
Filing: 1972-06-19
•
Granted: 1974-04-16
•
Expires: 1992-06-19
Abstract
Abstract The invention relates to a gear shift device particularly for bicycles ensuring the efficient guidance of the chain, this device comprising a deformable parallellogram of which one of the branches is fixed and forms the support of the gear shift, and of which the opposite branch, in movement during the translation, supports the guiding and tensioning rollers for the chain passing over the free wheel, the gear shift device being characterized in that the branch of the parallellogram supporting the rollers is part of an anchor directed toward the free wheel, this anchor in addition being located in a plane parallel to the plane of the rollers, but offset slightly, with respect to the plane of the rollers, toward the deformable parallellogram.
Inventors
- 👤 R Huret
- 👤 J Huret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:28
CPC Classifications
B; B62; B62M; B62M9/00; B62M9/04; B62M9/06; B62M9/10; B62M9/12; B62M9/121; B62M9/124; B62M9/1242
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
145 words
A gear shift for a bicycle wheel of the type comprising a plurality of different size sprockets rotatable about an axis and guiding and tensioning rollers for a sprocket chain comprising, a parallelogram comprising four interconnected links, means mounting one of said links in said parallelogram in fixed position with respect to said bicycle, the other links in said parallelogram being pivotally connected to each other so that said parallelogram is deformable, said guiding and tensioning rollers being supported by said link opposite said fixed link for movement therewith, and means for guiding the sprocket chain as it moves from one sprocket to another being connected to and supported by said last named link for movement therewith, said guide means lying in a plane which is parallel to the plane in which said guiding and tensioning rollers lie but displaced slightly therefrom toward said parallelogram.
Claim 2
Dependent Claim
145 words
A gear shift for a bicycle wheel of the type comprising a plurality of different size sprockets rotatable about an axis and guiding and tensioning rollers for a sprocket chain comprising, a parallelogram comprising four interconnected links, means mounting one of said links in said parallelogram in fixed position with respect to said bicycle, the other links in said parallelogram being pivotally connected to each other so that said parallelogram is deformable, said guiding and tensioning rollers being supported by said link opposite said fixed link for movement therewith, and means for guiding the sprocket chain as it moves from one sprocket to another being connected to and supported by said last named link for movement therewith, said guide means lying in a plane which is parallel to the plane in which said guiding and tensioning rollers lie but displaced slightly therefrom toward said parallelogram.
Claim 3
Dependent Claim
83 words
A gear shift according to claim 1 wherein said guide means is disposed at an acute angle with respect to said fixed link and said link opposite said fixed link, said fixed link being disposed below the axis of said sprockets and sloping downwardly and toward the plane of said guiding and tensioning rollers so that when said parallelogram is deformed to bring the sprocket chain onto a sprocket of greater diameter, said guide means moves away from the axis of said sprockets.
References Cited (Backward Citations)
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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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |