FR2264709A1 - Oval crank wheel for bicycle - has elliptical or similar shape for minimum loss of energy - Google Patents

Oval crank wheel for bicycle - has elliptical or similar shape for minimum loss of energy

Info

Publication number
FR2264709A1
FR2264709A1 FR7410694A FR7410694A FR2264709A1 FR 2264709 A1 FR2264709 A1 FR 2264709A1 FR 7410694 A FR7410694 A FR 7410694A FR 7410694 A FR7410694 A FR 7410694A FR 2264709 A1 FR2264709 A1 FR 2264709A1
Authority
FR
France
Prior art keywords
bicycle
energy
elliptical
minimum loss
crank wheel
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.)
Granted
Application number
FR7410694A
Other languages
French (fr)
Other versions
FR2264709B3 (en
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.)
BONNEAU GABRIEL
Original Assignee
BONNEAU GABRIEL
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 BONNEAU GABRIEL filed Critical BONNEAU GABRIEL
Priority to FR7410694A priority Critical patent/FR2264709A1/en
Publication of FR2264709A1 publication Critical patent/FR2264709A1/en
Application granted granted Critical
Publication of FR2264709B3 publication Critical patent/FR2264709B3/fr
Granted legal-status Critical Current

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
    • 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
    • B62M2009/002—Non-circular chain rings or sprockets

Abstract

An oval crank wheel for a bicycle may be of an elliptical shape, or may consist of tangential circumferential portions which blend into one another, or of circumferential secant portions, or may consist of a curve which is other than a circumference. The shape chosen is intended to ensure that a constant force is applied to the pedals of all positions of the rider's legs, ensuring a minimum loss of energy. For practical purposes, including the comfort of the rider, the difference between the major and minor axes of the curve is 30%.
FR7410694A 1974-03-22 1974-03-22 Oval crank wheel for bicycle - has elliptical or similar shape for minimum loss of energy Granted FR2264709A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7410694A FR2264709A1 (en) 1974-03-22 1974-03-22 Oval crank wheel for bicycle - has elliptical or similar shape for minimum loss of energy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7410694A FR2264709A1 (en) 1974-03-22 1974-03-22 Oval crank wheel for bicycle - has elliptical or similar shape for minimum loss of energy

Publications (2)

Publication Number Publication Date
FR2264709A1 true FR2264709A1 (en) 1975-10-17
FR2264709B3 FR2264709B3 (en) 1977-01-14

Family

ID=9136936

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7410694A Granted FR2264709A1 (en) 1974-03-22 1974-03-22 Oval crank wheel for bicycle - has elliptical or similar shape for minimum loss of energy

Country Status (1)

Country Link
FR (1) FR2264709A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193324A (en) * 1977-12-27 1980-03-18 Clint, Inc. Bicycle sprocket drive apparatus with elliptical pedal path
FR2501146A1 (en) * 1981-03-06 1982-09-10 Bouffard Claude Drive sprocket for bicycle - has periphery of sprocket between pedal cranks extended to aid continuous power output
US4522610A (en) * 1982-06-01 1985-06-11 Shimano Industrial Company Limited Gear crank apparatus for a bicycle
FR2704921A1 (en) * 1993-05-06 1994-11-10 Rosset Bernard Shape for a bicycle crank assembly chain wheel
WO2001064505A1 (en) * 2000-03-03 2001-09-07 Daniel Gongora Sanchez Bicycle transmission

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193324A (en) * 1977-12-27 1980-03-18 Clint, Inc. Bicycle sprocket drive apparatus with elliptical pedal path
FR2501146A1 (en) * 1981-03-06 1982-09-10 Bouffard Claude Drive sprocket for bicycle - has periphery of sprocket between pedal cranks extended to aid continuous power output
US4522610A (en) * 1982-06-01 1985-06-11 Shimano Industrial Company Limited Gear crank apparatus for a bicycle
FR2704921A1 (en) * 1993-05-06 1994-11-10 Rosset Bernard Shape for a bicycle crank assembly chain wheel
WO2001064505A1 (en) * 2000-03-03 2001-09-07 Daniel Gongora Sanchez Bicycle transmission
ES2189583A1 (en) * 2000-03-03 2003-07-01 Sanchez Daniel Congora Bicycle transmission

Also Published As

Publication number Publication date
FR2264709B3 (en) 1977-01-14

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Legal Events

Date Code Title Description
ST Notification of lapse