DE83413C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The new foot drive for bicycles is characterized by the fact that the rider, leaning against the saddle, stands with the toes of the almost outstretched legs on firm treads α and with the heels on the two alternately moved foot steps b ¹ b ² and the bicycle only gets through Lowering and raising his heels sets in motion, with his own weight pressing down the kicks.

Each foot step forms an angle lever which is rotatably mounted on an axis of the chassis, one arm b ^{1 of} which is provided with the foot step surface and the other arm b ^{2 of which is} connected to a handlebar c . The connection can be made in such a way that the end of the handlebar c ¹ with a guide piece c 1 in a slot of the lever arm and is held in a desired position by a pawl c ^{2 of} the guide piece, which engages in a toothing of the lever arm.

The other end of the link c is attached to a pawl disk d , which sits loosely on a sprocket axle that carries a toothed disk e for each of the two pawl disks. A number of thrust pawls d ¹ engage in the toothed disk in such a way that in a rest position of the pawl disk at least one pawl rests directly against a tooth head and by pulling on the handlebar c continuously press pawls against tooth heads and thus the toothed disk; e, while the handlebar c is pulled down by the step lever b ¹ V · , turn continuously. The sprocket axis is turned with the toothed disk, on which, however, the sprocket f ¹ rests not firmly but loosely by means of a ball bearing. It is respectively from the axis by means of two spiral springs g ^1. g ² reversed, which on the one hand are both connected to the axle. The other end of the one spring g ¹ is also firmly connected to the sprocket f ¹ , while the other end of the second stronger spring g ' ^{2 is provided} with a hook which is some distance in front of a hook f ^{1 of} the sprocket. As a result of the spring g ^l , which coils slightly when the toothed pulley axis is turned, the sprocket f becomes free of substance and from it through suitable translation elements, e.g. B. several chains and sprockets, the impeller L reversed, while the stronger spring g ² only in

Activity

kick,

if the weaker spring g ^{1 is} excessively contracted as a result of a greater resistance to movement and thus the hook of the spring g ² behind the hook f ^{1 of} the sprocket.

The ■ deflection of the ratchet disk d must be limited against the pull of the spring g ¹ , which can be done by a stop located on the bicycle frame. This can consist of a small angle lever h , which can be easily engaged and disengaged by means of the handle h ¹ and pull rod h ² and, in the disengaged position, makes room for another stop i , which allows the pawl disc to swing upwards. The deflection size can also be limited in another way, as just shown, and furthermore by adjusting the adjustment

binding parts between the rod c and the lever arm b ² are regulated to each other.

Claims (2)

Patent Claims: 1. Foot drive for bicycles, consisting of a fixed support surface (a) for each foot toe of the standing rider and a pedal lever (b ¹ b ² ) for each foot heel, which is independent of the support surface, for the purpose of alternately lowering and raising the foot heels and to drive the sprocket under the driver's own weight. 2. A device for transmitting the movement generated according to claim ι by means of switching mechanisms and springs on the chain wheel, characterized in that two spiral springs (g ¹ g ² ) are arranged between the switching mechanism and the chain wheel, of which the one weaker (g ¹ ) with rear derailleur and sprocket, the other (g ² ) is only connected to the rear derailleur at one end, while its other end, which ends in a hook, is at some distance from a hook on the sprocket ff ¹ J , for this purpose to bring into action only the weaker spring in the case of smaller power transmissions, but also the stronger spring in the case of greater exertion. For this purpose ι sheet of drawings.