US3583249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain shifting means for derailleur speed changing devices
Assignee: MORSE NENA
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Filing: 1969-08-21
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Granted: 1971-06-08
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Expires: 1989-08-21
Abstract
Abstract Improved derailleur mechanism in which the rotatably mounted resiliently loaded cage which accommodates slack in the sprocket chain is so positioned that when laterally moved, it enables a segment of the chain being shifted to the next lower numerical ratio to be pinched between an idler sprocket on the cage and the next lower numerical ration sprocket, whereby the angular velocity of the driven sprocket accelerates the segment of the chain being shifted to facilitate the lateral shift of said segment onto the selected sprocket.
Inventors
- 👤 Milton Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:00
CPC Classifications
B; B62; B62M; B62M9/00; B62M9/04; B62M9/06; B62M9/10; B62M9/12; B62M9/121; B62M9/126
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
206 words
In a derailleur speed change mechanism including a driven sprocket chain, a driven shaft having a plurality of sprockets of differing numbers of teeth arranged in coaxial relation upon said driven shaft, a pivotally mounted cage having at least one idler sprocket thereon, said chain passing over said idler sprocket and selectively over one of said plurality of sprockets to drive said shaft, said cage being shiftable along its axis of rotation to move said sprocket chain to engage a selected one of said plurality of sprockets, the improvement comprising: said cage being positioned relative to said driven shaft such that pivotal movement of said cage causes said idler sprocket to describe a path of movement selectively overlying the peripheries of said plurality of sprockets, whereby movement of said cage along its own pivotal axis may cause said sprocket chain to be pinched against a juxtaposed periphery of one of said plurality of sprockets to momentarily impart the angular velocity of said last mentioned sprocket to the pinched portion of the chain to facilitate engagement thereof with said sprocket. 2. Structure in accordance with claim 1, said cage having first and second idler sprockets disposed on opposite sides of the axis of rotation of said cage.
Claim 2
Dependent Claim
40 words
Structure in accordance with claim 2, said first idler sprocket being disposed closer to said plurality of sprockets than said second idler sprocket, and having an arcuate path of travel of greater radius than that of said second idler sprocket.
Claim 3
Dependent Claim
82 words
Improved cage structure for use with a derailleur speed change mechanism comprising: a frame member, said frame member including means forming a pivotal axis and having first and second parallel shafts, first and second idler sprockets supported for rotation on said first and second shafts, respectively, each of said idler sprockets having shortened sprocket teeth which extend only to the pitch line thereof, the pitch lines of said first and second idler sprockets having pitch circles which are in substantially tangential relation.
Claim 4
Dependent Claim
82 words
Improved cage structure for use with a derailleur speed change mechanism comprising: a frame member, said frame member including means forming a pivotal axis and having first and second parallel shafts, first and second idler sprockets supported for rotation on said first and second shafts, respectively, each of said idler sprockets having shortened sprocket teeth which extend only to the pitch line thereof, the pitch lines of said first and second idler sprockets having pitch circles which are in substantially tangential relation.
Claim 5
Dependent Claim
30 words
Structure in accordance with claim 4, including a pair of guide plates on either side of one of said sprockets, said guide plates overlying the pitch circle of said sprocket.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |