Reciprocating pedalling mechanism for the continuous drive of bicycles and like vehicles

摘要

692,805. Ratchet gearing. HAVET, A. L. Sept. 25, 1950, No. 23415/.50. Class 80 (iii). [Also in Group XXXI] In a pedalling mechanism for bicycles and like vehicles comprising two independent pedal cranks 22, 23 having rotary axles 4 which are rigid with geared pinions 5, 6 so that the cranks can turn in opposite directions, a toothed wheel 12 is driven in one direction only by devices on the axles 4. The spindles 4 carry sectors 24, 25 provided with catches 26 which engage a ratchet wheel 27 formed inside a rotary member 11 to which the toothed wheel 12 is secured. Alternatively, the member 11 may be replaced by a member having its inner surface frictionally engaged by shoes 35 carried by sectors 34. Slopes 37, 38 are cut respectively in each co-operating sector and shoe to form races for rollers 36. Each roller has a groove inside which is carried a strap 40 connecting the two. rollers on each sector. Springs 41, 42 bear respectively on each sector 34 and on the strap 40 and urge the shoe 35 outwardly. Spring blades 43 guide the shoes 35 to allow only a movement of the shoes towards the sections 34 or towards the inner surface of a hollow member which is integral with the toothed wheel.