GB525149A - Semi-automatic expansible sector change-speed gear for cycles in general - Google Patents

Semi-automatic expansible sector change-speed gear for cycles in general

Info

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
Application number
GB4960/39A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CESARE RAVETTO
FRANCESCO RAVETTO
Original Assignee
CESARE RAVETTO
FRANCESCO RAVETTO
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CESARE RAVETTO, FRANCESCO RAVETTO filed Critical CESARE RAVETTO
Publication of GB525149A publication Critical patent/GB525149A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62MRIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/08Transmissions 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.
GB4960/39A 1938-02-15 1939-02-15 Semi-automatic expansible sector change-speed gear for cycles in general Expired GB525149A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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