GB522059A - Braking device for cycles - Google Patents

Abstract

522,059. Cycle brakes. BOSSHARDT, K. Jan. 2, 1939, No. 66. [Class 136 (i)] In back-pedalling mechanism for operating the front and rear brakes of cycles by means of a ratchet clutch in the crank bracket, the pawl of the ratchet clutch is controlled in the following manner to enable it to remain disengaged during forward driving and to enable it to be moved by hand to a position in which it is held disengaged when the cycle is wheeled backwards. A ratchet wheel 4 fixed to the pedal crankshaft 1 is arranged to engage a pawl 11 pivoted to an arm 10 on a spindle 9 rotatably mounted in a casing 5, this ratchet clutch on back-pedalling causing the rotation of the casing 5 to apply both the rear brake, through an arm 14 and a rod &c. 16, and the front brake through an arm 15 and a cable 17. During forward pedalling, the pawl 11 is held inoperative by a resilient band 6 adapted to grip the ratchet wheel 4 and to move therewith within the limits. imposed by the engagement of a bulge 7 with one of two guide pins 8, so that on back-pedalling a gap in the band 6 comes opposite the pawl 11, which then engages the ratchet wheel 4. In order to enable the cycle to be wheeled backwards, the pawl 11 may also be disengaged be hand by means of a cable 13 connected to an arm 12 on the spindle 9, the pawl being provided with a stop to hold it in the disengaged position. In order to permit the proportion of the braking forces transmitted to the front and rear wheels to be varied, the cable 17 is fitted with a regulating device comprising a screw 22, Fig, 2, which receives loosely the end of the cable casing 24 and engages a fixed threaded bracket 21. The front brake may also be applied by hand, the front fork being provided with a common abutment for the casing 24 of the cable 17 and the casing of the hand-actuated cable.