GB525149A - Semi-automatic expansible sector change-speed gear for cycles in general - Google Patents
Semi-automatic expansible sector change-speed gear for cycles in generalInfo
- Publication number
- GB525149A GB525149A GB4960/39A GB496039A GB525149A GB 525149 A GB525149 A GB 525149A GB 4960/39 A GB4960/39 A GB 4960/39A GB 496039 A GB496039 A GB 496039A GB 525149 A GB525149 A GB 525149A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disc
- segments
- plate
- ravetto
- feb
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
- B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/08—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically- mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
525,149. Expanding-wheel chain gearing. RAVETTO, C., and RAVETTO, F. Feb. 15, 1939, No. 4960. Convention date, Feb. 15, 1938. [Class 80 (ii)] An expanding sprocket, for a cycle bottombracket, comprises a number of toothed segments 3, slidable along radial grooves 20 in a plate 2, fixed to the driving shaft 6, by the relative turning of a loosely mounted disc 1 having a continuous spiral groove 19 receiving pins 15 on the segments 3. The relative turning is produced by lifting a hook 11 away from a stop 9, which is thereupon pressed by a spring 16 into a notch 10 in the disc 1, stationing the latter whilst the driving plate 1 is turned by pedals in the appropriate direction for expansion or contraction of the segments 3. At the end of one complete turn, a roller 4 on the plate 2 pushes the stop 9 back under the hook 11, freeing the disc 1 and completing the change. The gear provides as many ratios (five or more) as there are complete turns in the spiral groove 19. The chain is tensioned by a spring-loaded jockeypulley.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT525149X | 1938-02-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB525149A true GB525149A (en) | 1940-08-22 |
Family
ID=11277195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4960/39A Expired GB525149A (en) | 1938-02-15 | 1939-02-15 | Semi-automatic expansible sector change-speed gear for cycles in general |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB525149A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201094A (en) * | 1977-11-28 | 1980-05-06 | Rathmell Richard K | Automatic speed shift for bicycles and the like |
-
1939
- 1939-02-15 GB GB4960/39A patent/GB525149A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4201094A (en) * | 1977-11-28 | 1980-05-06 | Rathmell Richard K | Automatic speed shift for bicycles and the like |
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