US3648809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two speed bicycle transmission with brake
Assignee: ZF Friedrichshafen AG
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Filing: 1970-07-06
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Granted: 1972-03-14
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Expires: 1990-07-06
Abstract
Abstract A multiple speed hub for the rear wheel of a bicycle or the like has a planetary gear transmission and pawl-and-ratchet clutches respectively coupling the planet carrier and the ring gear of the transmission to the hub shell, the planet carrier serving as the driver of the hub. The pawls on the ring gear can be disengaged from a ratchet on the hub shell by a flanged disc whose hub is rotatably mounted on the driver, and whose flanges has an internal cam face engaging the pawls. Cam lobes having each a gentle and a steep slope are provided on the cam face, and the ring is normally rotated by abutting engagement of the pawls with the steep flanks, but braked by a frictional coupling to a stationary or more slowly rotating hub element. During back pedaling, the pawls travel over the gentle flanks of the braked control disc to drop into a portion of the cam face differently spaced from the hub axis, whereby the pawls may be engaged with or disengaged from the cooperating ratchet and the hub shifted from one gear ratio to another.
Inventors
- 👤 Hans Joachim Schwerdhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:28
CPC Classifications
B; B62; B62M; B62M11/00; B62M11/04; B62M11/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
388 words
In a multiple speed hub including a shaft having an axis, a driver member and a hub shell mounted on said shaft for rotation about said axis, means for rotating said driver member in a forward direction or in a backward direction, and a multiple speed transmission operatively interposed between said driver member and said hub shell for rotating said hub shell at a selected one of several speeds when said driver member rotates in said forward direction at a predetermined speed, the transmission including a plurality of transmission members connected for simultaneous rotation at different respective speeds with each other and with said driver member, and two clutches respectively interposed between two of said transmission members and said hub shell, and speed selector means for engaging and disengaging one of said clutches, said one clutch being interposed between the more rapidly rotating one of said two transmission members and said hub shell and including a plurality of pawl members and a ratchet member annular about said axis and enveloping said pawl members, said speed selector means being effective for engaging and disengaging said pawl and ratchet members, the improvement in the speed selector means which comprises: a. a control element including a hub portion having an inner bearing face mounted for rotation about said axis and a flange portion having an annular cam face directed toward said axis; b. biasing means biasing said pawl members toward camming engagement with said cam face, 1. respective portions of said cam face being nearer and more remote from said axis in such a manner that said pawl members engage said ratchet member in a first relative angular position of said control element and of said pawl members and are disengaged from said ratchet member in a second angular position of said control element and of said pawl members; c. abuttingly engageable means on said control element and on said pawl members for rotation of said control element by said pawl members in said first and second positions when said driver member rotates in said forward direction; and d. operating means for shifting said pawl members and said control element relative to each other between said positions, 1. said operating means including brake means for impeding rotation of said control element when said driver member is rotated in a backward direction.
Claim 2
Dependent Claim
388 words
In a multiple speed hub including a shaft having an axis, a driver member and a hub shell mounted on said shaft for rotation about said axis, means for rotating said driver member in a forward direction or in a backward direction, and a multiple speed transmission operatively interposed between said driver member and said hub shell for rotating said hub shell at a selected one of several speeds when said driver member rotates in said forward direction at a predetermined speed, the transmission including a plurality of transmission members connected for simultaneous rotation at different respective speeds with each other and with said driver member, and two clutches respectively interposed between two of said transmission members and said hub shell, and speed selector means for engaging and disengaging one of said clutches, said one clutch being interposed between the more rapidly rotating one of said two transmission members and said hub shell and including a plurality of pawl members and a ratchet member annular about said axis and enveloping said pawl members, said speed selector means being effective for engaging and disengaging said pawl and ratchet members, the improvement in the speed selector means which comprises: a. a control element including a hub portion having an inner bearing face mounted for rotation about said axis and a flange portion having an annular cam face directed toward said axis; b. biasing means biasing said pawl members toward camming engagement with said cam face, 1. respective portions of said cam face being nearer and more remote from said axis in such a manner that said pawl members engage said ratchet member in a first relative angular position of said control element and of said pawl members and are disengaged from said ratchet member in a second angular position of said control element and of said pawl members; c. abuttingly engageable means on said control element and on said pawl members for rotation of said control element by said pawl members in said first and second positions when said driver member rotates in said forward direction; and d. operating means for shifting said pawl members and said control element relative to each other between said positions, 1. said operating means including brake means for impeding rotation of said control element when said driver member is rotated in a backward direction.
Claim 3
Dependent Claim
24 words
In a hub as set forth in claim 1, said brake means including a friction spring interposed between said control member and said shaft.
Claim 4
Dependent Claim
40 words
In a hub as set forth in claim 1, said brake means including a friction spring interposed between said control element and one of said transmission members rotating at a speed different from the speed of said one transmission member.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |