Patent EP0755781A1 successfully refreshed from Google Patents.
US3847028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leaf spring biased derailleur arrangement
Assignee: ZF Friedrichshafen AG
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Filing: 1974-02-20
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Granted: 1974-11-12
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Expires: 1994-02-20
Abstract
Abstract The cage carrying the guide wheel and the tensioning wheel of a derailleur arrangement in a bicycle is attached to the rear wheel shaft by an elliptic spring assembly whose two leaf springs have longitudinally terminal portions hingedly fastened to each other for pivotal movement about pivot axes perpendicular to the generatrix of the conical enveloping surface defined by the stack of drive sprockets on the rear wheel shaft. The center portion of one leaf spring is fastened to the rear wheel shaft, and the center portion of the other leaf spring is fastened to the shaft of the guide sprocket on which the cage pivots.
Inventors
- 👤 E Bergles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:20
CPC Classifications
B; B62; B62M; B62M9/00; B62M9/04; B62M9/06; B62M9/10; B62M9/12; B62M9/121; B62M9/124; B62M9/1248
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
211 words
A variable-speed transmission arrangement comprising, in combination: a. a shaft having an axis; b. a plurality of sprocket wheels mounted on said shaft for rotation about said axis; 1 said wheels decreasing in diameter in axial sequence and jointly defining a conical enveloping surface having a generatrix obliquely inclined relative to said axis; c. elliptic spring means including two elongated leaf springs having each a first and a second terminal portion, and two hinge means respectively connecting said first terminal portions and said second terminal portions for relative pivotal movement of the connected terminal portions about a first pivot axis and a second pivot axis, 1. said pivot axes being spaced from each other in the direction of elongation of said leaf springs and jointly defining a plane perpendicular to said generatrix, 2. said leaf springs having respective longitudinally intermediate portions spaced from said plane in opposite directions; d. carrier means fixedly securing one of said intermediate portions to said shaft; e. manually operable moving means for moving said intermediate portions toward and away from each other; f. a guide wheel; and g. bracket means fastened to the other intermediate portion and supporting said guide wheel for rotation about an axis extending in the direction of the axis of said shaft.
Claim 2
Dependent Claim
211 words
A variable-speed transmission arrangement comprising, in combination: a. a shaft having an axis; b. a plurality of sprocket wheels mounted on said shaft for rotation about said axis; 1 said wheels decreasing in diameter in axial sequence and jointly defining a conical enveloping surface having a generatrix obliquely inclined relative to said axis; c. elliptic spring means including two elongated leaf springs having each a first and a second terminal portion, and two hinge means respectively connecting said first terminal portions and said second terminal portions for relative pivotal movement of the connected terminal portions about a first pivot axis and a second pivot axis, 1. said pivot axes being spaced from each other in the direction of elongation of said leaf springs and jointly defining a plane perpendicular to said generatrix, 2. said leaf springs having respective longitudinally intermediate portions spaced from said plane in opposite directions; d. carrier means fixedly securing one of said intermediate portions to said shaft; e. manually operable moving means for moving said intermediate portions toward and away from each other; f. a guide wheel; and g. bracket means fastened to the other intermediate portion and supporting said guide wheel for rotation about an axis extending in the direction of the axis of said shaft.
Claim 3
Dependent Claim
78 words
said leaf springs having respective longitudinally intermediate portions spaced from said plane in opposite directions; d. carrier means fixedly securing one of said intermediate portions to said shaft; e. manually operable moving means for moving said intermediate portions toward and away from each other; f. a guide wheel; and g. bracket means fastened to the other intermediate portion and supporting said guide wheel for rotation about an axis extending in the direction of the axis of said shaft.
Claim 4
Dependent Claim
78 words
said leaf springs having respective longitudinally intermediate portions spaced from said plane in opposite directions; d. carrier means fixedly securing one of said intermediate portions to said shaft; e. manually operable moving means for moving said intermediate portions toward and away from each other; f. a guide wheel; and g. bracket means fastened to the other intermediate portion and supporting said guide wheel for rotation about an axis extending in the direction of the axis of said shaft.
Claim 5
Dependent Claim
43 words
An arrangement as set forth in claim 1, wherein each of said intermediate portions is equidistant from said first pivot axis and of said second pivot axis, and the axes of rotation of said sprocket wheels and of said guide wheel are parallel.
Claim 6
Dependent Claim
51 words
An arrangement as set forth in claim 2, wherein said carrier meaNs include an elongated carrier bar and said bracket means include an elongated bracket bar, one of said bars having a longitudinal portion folded back on itself and clampingly receiving one of said intermediate portions between the folded-back parts thereof.
Claim 7
Dependent Claim
32 words
An arrangement as set forth in claim 3, wherein the other bar has a longitudinal portion folded back on itself and clampingly receives the other intermediate portion between the folded-back parts thereof.
Claim 8
Dependent Claim
38 words
An arrangement as set forth in claim 4, wherein said carrier means and said bracket means include respective securing means securing the other longitudinal end portions of said bars to said shaft and to said guide wheel, respectively.
Claim 9
Dependent Claim
29 words
An arrangement as set forth in claim 4, wherein said moving means include a Bowden cable having a pressure member and a tension member respectively fastened to said bars.
Claim 10
Dependent Claim
87 words
An arrangement as set forth in claim 2, further comprising a guide wheel shaft mounted on said bracket means and having an axis, said guide wheel being mounted on said guide wheel shaft for rotation in a plane perpendicular to the axis of said guide wheel shaft, a cage pivotally mounted on said guide wheel shaft, a tensioning wheel mounted on said cage for rotation in said perpendicular plane, and yieldably resilient means biasing said cage to pivot on said guide wheel shaft in a predetermined direction.
Claim 11
Dependent Claim
36 words
An arrangement as set forth in claim 7, wherein said yieldably resilient means include a helical torsion spring coiled about said guide wheel shaft and having respective ends abuttingly engaging said cage and said bracket means.
References Cited (Backward Citations)
US2187368A
Cited
GB597097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |