Patent US2638260A successfully refreshed from Google Patents.
Patent US3633938A successfully refreshed from Google Patents.
US3633938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission mechanism
Assignee: British and Foreign Tobacco Co Ltd
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Filing: 1970-03-09
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Granted: 1972-01-11
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Expires: 1990-03-09
Abstract
Abstract This invention relates to a transmission mechanism for use in converting a reciprocal motion into a rotating motion and which is provided with means for adjusting the transmission ratio. The invention is particularly but not exclusively concerned with transmission mechanisms for use with vehicles, such as, for example, pedal-operated bicycles or the like.
Inventors
- 👤 Arieh Solomon
- 👤 Jecheskel Davidovitch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:43
CPC Classifications
B; B62; B62M; B62M1/00; B62M1/24; B62M1/28; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1553; Y10T74/1555
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
A transmission mechanism for converting reciprocating motion to rotating motion comprising; a. a frame; b. a drive lever pivotally mounted on said frame for pivotal displacement and adapted to be connected to a rotatable element; c. a first coupling member pivotally mounted on said frame for pivotal displacement, and adapted to be connected to a reciprocable element; d. a second coupling member pivotally connected to said drive lever; and e. connection means interconnecting the coupling members for converting displacement of said first coupling member into displacement of said drive lever; f. said connection means comprising a curved guide on one of said members in the form of a curved edge, and a guide engager on the other of said members in the form of a pin engaged with said curved guide.
Claim 2
Dependent Claim
131 words
A transmission mechanism for converting reciprocating motion to rotating motion comprising; a. a frame; b. a drive lever pivotally mounted on said frame for pivotal displacement and adapted to be connected to a rotatable element; c. a first coupling member pivotally mounted on said frame for pivotal displacement, and adapted to be connected to a reciprocable element; d. a second coupling member pivotally connected to said drive lever; and e. connection means interconnecting the coupling members for converting displacement of said first coupling member into displacement of said drive lever; f. said connection means comprising a curved guide on one of said members in the form of a curved edge, and a guide engager on the other of said members in the form of a pin engaged with said curved guide.
Claim 3
Dependent Claim
47 words
A transmission mechanism according to claim 1 including transmission adjusting means connected to said second coupling member to maintain said guide engager in selective operative engagement with said guide for establishing the ratio between the displacement of said first coupling member and displacement of said drive lever.
Claim 4
Dependent Claim
37 words
A transmission mechanism according to claim 2 wherein said adjusting means includes a speed responsive mechanism responsive to rotation of said rotatable element for functionally relating said ratio of displacement to the speed of the rotatable element.
Claim 5
Dependent Claim
36 words
A transmission mechanism according to claim 3 wherein said speed responsive mechanism includes a spindle which is displaceable in accordance with said speed and is pivotally coupled to said second coupling member via a connecting link.
Claim 6
Dependent Claim
16 words
A transmission mechanism according to claim 3 wherein said speed responsive mechanism includes a flyball governor.
Claim 7
Dependent Claim
112 words
A pedal-operated cycle according to claim 3 and having a wheel shaft, and wherein said drive mechanism comprises a first sprocket wheel mounted on an axle so as to be rotatable with the axle in one sense and to be capable of rotation with respect to the axle in the opposite sense, a second sprocket wheel keyed to said axle, a third sprocket wheel keyed to said wheel shaft of the cycle and coupled to the second sprocket wheel by means of a dive chain, said drive lever being coupled to one end of a further chain which passes around the first sprocket wheel and is secured thereto at its other end.
Claim 8
Dependent Claim
44 words
A transmission mechanism according to claim 2 wherein said second coupling member is pivotally coupled at an intermediate position thereof to said drive lever, carries said pin at one end thereof and is pivotally coupled at an opposite end thereof to said adjusting means.
Claim 9
Dependent Claim
24 words
A transmission mechanism according to claim 2 wherein said adjusting means comprises manuaLly operated means whereby the transmission ratio can be adjusted at will.
Claim 10
Dependent Claim
20 words
A pedal-operated cycle according to claim 2 wherein said adjusting means comprises speed responsive mechanism accommodated within a wheel shaft.
Claim 11
Dependent Claim
63 words
A pedal-operated cycle provided with a transmission mechanism according to claim 1 and including a reciprocatable foot pedal that constitutes a part of said reciprocable element, a sprocket and chain drive mechanism that constitutes part of said rotatable element, means connecting said first coupling member to said reciprocatable foot pedal, and means connecting said drive lever to said sprocket and chain drive mechanism.
Claim 12
Dependent Claim
13 words
A transmission mechanism according to claim 1 wherein said curved edge is scalloped.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |