Patent US3903751A successfully refreshed from Google Patents.
US3903751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bicycle derailler with overload cable protection means
Assignee: Beatrice Companies Inc
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Filing: 1974-04-24
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Granted: 1975-09-09
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Expires: 1994-04-24
Abstract
Abstract A derailler for bicycles for moving the chain to sprocket wheels of varying diameters in which the control mechanism of the derailler includes a spring loaded linkage such that if the actuating cable is moved while the bicycle is not moving, the cable will not be subjected to stretching and breaking, but a spring loaded linkage allows the cable to move and exerts a spring bias on the derailler such that shifting occurs after the bicycle is placed in motion thus preventing injury and breakage to the mechanism.
Inventors
- 👤 Walter Dian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:20
CPC Classifications
B; B62; B62M; B62M9/00; B62M9/04; B62M9/06; B62M9/10; B62M9/12; B62M9/121; B62M9/124; B62M9/1244; B62M9/1242; B62M9/1248; B62M9/127; B62M9/128
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
A rear derailler mechanism for moving the drive chain of a bicycle having at least two sprocket wheels connected to the rear wheel comprising, a generally channel-shaped housing member attached to said bicycle adjacent the rear wheel, a parallelogram linkage mechanism comprising three links with two links having first ends pivotally connected to said channel-shaped housing member and the third link with its opposite ends pivotally connected to the second ends of said two links, a chain engaging roller cage supported by said parallelogram, a control cable mounted on the bicycle and movable to at least two positions, an actuating link pivotally connected to said housing member, a first spring means connected between said actuating link and said housing, and a second spring means connected between said actuating link and said parallelogram, wherein said first and second spring means allow said actuating link to move said parallelogram relative to said housing when said cable is moved unless the parallelogram is blocked, under which condition said actuating link moves against said first spring means as said parallelogram remains stationary.
Claim 2
Dependent Claim
178 words
A rear derailler mechanism for moving the drive chain of a bicycle having at least two sprocket wheels connected to the rear wheel comprising, a generally channel-shaped housing member attached to said bicycle adjacent the rear wheel, a parallelogram linkage mechanism comprising three links with two links having first ends pivotally connected to said channel-shaped housing member and the third link with its opposite ends pivotally connected to the second ends of said two links, a chain engaging roller cage supported by said parallelogram, a control cable mounted on the bicycle and movable to at least two positions, an actuating link pivotally connected to said housing member, a first spring means connected between said actuating link and said housing, and a second spring means connected between said actuating link and said parallelogram, wherein said first and second spring means allow said actuating link to move said parallelogram relative to said housing when said cable is moved unless the parallelogram is blocked, under which condition said actuating link moves against said first spring means as said parallelogram remains stationary.
Claim 3
Dependent Claim
46 words
A rear derailler mechanism for a bicycle according to claim 1 wherein ssaid actuating link engages one of said two links and stop surfaces formed on said actuating link and said one of said two links to limit the rotary movement between them in one direction.
Claim 4
Dependent Claim
32 words
A rear derailler mechanism for a bicycle according to claim 2 comprising first adjustable stop means for limiting the movement of said parallelogram in a first rotary direction relative to said housing.
Claim 5
Dependent Claim
32 words
A rear derailler mechanism for a bicycle according to claim 3 comprising second adjustable stop means for limiting the movement of said parallelogram in a second rotary direction relative to said housing.
Claim 6
Dependent Claim
24 words
A rear derailler mechanism for a bicycle according to claim 2 including a third spring means mounted between said parallelogram and said roller cage.
Claim 7
Dependent Claim
23 words
A rear derailler mechanism for a bicycle according to claim 5 including means for adjusting the spring tension of said third spring means.
References Cited (Backward Citations)
US3803933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |