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1. (WO1990002894) NONCIRCULAR DRIVE
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/1990/002894 International Application No.: PCT/US1989/003788
Publication Date: 22.03.1990 International Filing Date: 07.09.1989
IPC:
B62M 9/08 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
62
LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
M
RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
9
Transmissions characterised by use of an endless chain, belt, or the like
04
of changeable ratio
06
using a single chain, belt, or the like
08
involving eccentrically-mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel
Applicants: TRUSTEES OF COLUMBIA UNIVERSITY[US/US]; Morningside Heights New York, NY 10027, US
Inventors: FREUDENSTEIN, Ferdinand; US
Agent: MACBLAIN, Thomas, D.; Brumbaugh, Graves, Donohue & Raymond 30 Rockefeller Plaza New York, NY 10112, US
Priority Data:
242,02608.09.1988US
Title (EN) NONCIRCULAR DRIVE
(FR) ENTRAINEMENT NON CIRCULAIRE
Abstract:
(EN) A pedal assembly has typical pedals (71), attached in driving relation to a noncircular drive sprocket (72). The noncircular drive sprocket (72) is connected to a non-circular driven sprocket (73), via a chain (75), entrained about the two sprockets. A bicycle frame (76) establishes the center-to-center distance. The pitch curve of the drive sprocket (72) is twice as long as that of the driven sprocket (73). The spacing, shape and size of the sprockets maintaining the endless member substantially taut for each rotational position of the rotational members about which the flexible member is entrained. A method of making a noncircular drive is also disclosed.
(FR) Un ensemble à pédales comporte des pédales classiques (71) fixées dans une relation d'entraînement à une roue dentée (72) d'entraînement non circulaire. La roue dentée (72) non circulaire est reliée à une roue dentée (73) entraînée circulaire via une chaîne (75) entraînée autour de deux roues dentées. Un cadre (76) de bicyclette établit la distance centre à centre. La courbe primitive de la roue dentée (72) d'entraînement est deux fois plus longue que celle de la roue dentée (73) entraînée. L'espacement, la forme et la taille des roues dentées maintiennent l'élément sans fin sensiblement tendu pour chaque position rotationnelle des éléments rotationnels autour desquels l'élément flexible est entraîné. On a mis au point un procédé de fabrication d'un entraînement non circulaire.
Designated States: JP
European Patent Office (EPO) (AT, BE, CH, DE, FR, GB, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)