Mechanism for feature improvement for bicycles and other crankdriven mechanism

Abstract

In the case of bicycles, the purpose of the new construction is to make maximum use of the momentum produced by pedalling under varying ground conditions, load, and acceleration--thus making bicycling easier. The construction has two variable positions which reduce the time during which the pedals are in a dead position (top and bottom) and prolong the time where the pedals are at right angles (16) whereby maximum effect is gained from the power force. This applies if the direction of force is non-circular, i.e. when there is a rise of the ground, and under acceleration as well as "standing pedalling". New positioning is possible in relation to the pedal arm (18), i.e. when changed ground conditions (rise) cause the center of gravity (pedalling) to shift. The invention differs from existing ones in that there is "increased" angular velocity between the driving shaft (1) and driven shaft (2) when they are on the same level and have the same longitudinal direction, which is the case in this construction. Also, the special suspension obtained by means of three moving rings (3) (4) (5) (like cardan suspension) of which the change of angle and vertical position (4) of the second ring together with the manually controllable parts (16) (18) produce the above-mentioned increased angular velocity and its position in relation to a given center of gravity. (9) shows an exterior bearing.

Dependencies are inferred from the claim text.