FIELD: transport.
SUBSTANCE: pedals are supplied with devices fastening footwear and are installed on cranks with possibility to automatically change crank length. Pedal frame (1) contains rectangular horizontal plate (2) having on its upper surface devices (5, 6) fastening bicyclist footwear and girdle (3) on one of its longitudinal edges with pedal axle (4) secured on crank. Plate (2) is connected with girdle (3) so that its upper surface is located below pedal axle (4) at distance (a) and axis (7) of footwear support on plate (2) of pedal located in frontal plane crossing bicyclist metatarsus of hallux when bicyclist revolves pedal is placed in front of pedal axle (4) at distance (b) so that axis (7) of footwear support circumscribes circle with centre (O') and radius (r') displaced below at distance (a) and at distance (b) forward in respect of circle with centre (O) circumscribed by pedal axle (4), where (O) is axis of carriage unit with radius (r).
EFFECT: acceleration of dead points passing and increase of torque.
17 cl, 16 dwg
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