Patent GB-703040-A (GB)
Title: Improvements in or relating to devices for attaching cyclist's shoes to the pedals of a cycle
IPC: B62M3/08
Filed: 1952-03-21
Abstract: 703,040. Cycle pedals. STEINVORTH, V. M. March 21, 1952, No. 7322/52. Class 136(2) [Also in Group VII] A quick release device for attaching a cyclist's shoes to pedals comprises a sole plate rigidly fixed to the cyclist's shoes and connected to the pedal by a plurality of elements which move'relatively to the pedal, the movement being controlled by the cyclist. The sole plates 30 (Fig. 6) may be screwed to the underside of the rider's shoes or attached to the shoes by clips 37 and straps 40. Each sole plate has ridges 31 having a central notch 32 and outer notches 33 of inverted L-shape. The pedal has an auxiliary movable framework 18 (Fig. 4) having slots 19<SP>1</SP>, 192 engaging studs 12<SP>1</SP>. 12<SP>2</SP> at the ends of a cross strut 11. The framework 18 is connected to a free-wheel casing 54. When the cyclist back pedals the casing 54 rotates in the direction of the arrow f6 (Fig. 4a) and lodges rollers 57 between the tapered edges of slots 55 and a sleeve 58. A tooth 17 on the sleeve 58 engages a worm thread 16 on the pedal spindle 1 and causes the framework 18 to move to the right against the action of springs 24<SP>1</SP>, 24<SP>2</SP> (Fig. 1). The sole plate 30 is then placed on the pedal so that the strut 11 on the pedal engages with the slot 32 and transverse rods 20 on the framework 18 engage with the slots 33 (Fig. 8). If the cyclist pedals forward the springs 24 return the framework 18 to its original position and the rods 20 are retained in the horizontal recesses of the L shaped notches 33. In a modification the sole plate (Fig. 14) has inclined walls 64 at the entry points of the notches 33 so that when the sole plate is pressed on to the rods 20 the springs 24 are extended and when the rods 20 enter the horizontal portions of the notches 33 the springs lock them in position. To release the sole plate from the modified pedal (Fig. 10) the cyclist pedals backwards and a helical projection 60 of the freewheel mechanism in contact with a tooth 61 which is screwed to the pedal axle 1 causes the drum 54 and consequently the framework 18 to move to the right against the action of the springs 24. In a further modification (Fig. 15) the sole plate is released by the action of the brake itself and not by back pedalling. The brake mechanism is of the horseshoe type, the lever arms of which 74<SP>1</SP>, 791 have arms 74<SP>3</SP>, 79<SP>3</SP>, carrying forks 78<SP>1</SP>, 78<SP>2</SP> which bear against the flanges 84<SP>1</SP>, 84<SP>2</SP> of sleeves 85<SP>1</SP>, 85<SP>2</SP>. Each sleeve 85 is connected to a sleeve 96 on the corresponding pedal by means of cables 99 and chains 100. The cyclist attaches the foot sole to the pedal as described above. On operation of the brake the gap between the forks 78<SP>1</SP>, 78<SP>2</SP> is reduced and the cables 99 and chains 100 actuate the sleeves 96 which in turn stretch the springs 24 and release the foot soles. When the brake control is released the springs 24 urge the limbs 74<SP>3</SP>, 79<SP>3</SP> apart and bring the brake into the " off " position.