US4116079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain drive shift system
Assignee: Individual
•
Filing: 1976-10-12
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Granted: 1978-09-26
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Expires: 1996-10-12
Abstract
Abstract In abstract, a preferred embodiment of this invention is a shift system for bicycle type chain drives, including noncable linkages for positive movement in both directions. The hand manipulated controls are conveniently located on the upper portion of the velocipede and are designed for simplicity and smooth operation.
Inventors
- 👤 James D. Pearce
- 👤 Stanley E. Pearce
- 👤 D. Kevin Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:13
CPC Classifications
B; B62; B62M; B62M9/00; B62M9/04; B62M9/06; B62M9/10; B62M9/12; B62M9/121; B62M9/124
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
An improved shift means for standard bicycle sprocket derailleur means comprising: a plurality of varying sized sprocket means; a flexible chain drive means; standard derailleur means for shiftingly training said chain drive means from one sprocket to another; a generally J-shaped derailleur adapter means fixedly secured to said standard derailleur means; crank means pivotably mounted adjacent said derailleur means, one end of said crank means being in cooperative operative engagement with said J-shaped adapter means; and handle means operatively associated with said crank means on the end thereof opposite the engagement with said J-shaped adapter means whereby said derailleur can be moved to shift said chain drive means from one sprocket to another by manipulation of said handle.
Claim 2
Dependent Claim
118 words
An improved shift means for standard bicycle sprocket derailleur means comprising: a plurality of varying sized sprocket means; a flexible chain drive means; standard derailleur means for shiftingly training said chain drive means from one sprocket to another; a generally J-shaped derailleur adapter means fixedly secured to said standard derailleur means; crank means pivotably mounted adjacent said derailleur means, one end of said crank means being in cooperative operative engagement with said J-shaped adapter means; and handle means operatively associated with said crank means on the end thereof opposite the engagement with said J-shaped adapter means whereby said derailleur can be moved to shift said chain drive means from one sprocket to another by manipulation of said handle.
Claim 3
Dependent Claim
23 words
The system of claim 1 wherein retaining means are provided for holding said handle in any one of a plurality of predetermined positions.
Claim 4
Dependent Claim
21 words
The system of claim 2 wherein said retaining means is a spring biased notch engaging means movable against a notched member.
Claim 5
Dependent Claim
22 words
The system of claim 3 wherein said notched member substantially defines a circle the center of which pivotably mounts said crank means.
Claim 6
Dependent Claim
26 words
The system of claim 4 wherein at least two sets of varying sized sprockets in the same drive system are shiftingly controlled from adjacent handle locations.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |