Bicycle crank assembly lock combines interposed gears on seat-tube fitted bolt in end fixer sleeves aided by locking and compression springs for locking bolt release and activation.

摘要

The tubular bolt (8) is fixed by top (9) and bottom (11) sleeves in top and bottom frame tubes (10,12) and is fitted with gears (34) between these. The sleeves are soldered, welded or press-fitted into the frame tubes as is the bolt to the sleeves in its turn. The upper part of the locking spring (50) sits axially on the locking bolt (3), the spring top end fitting into a pressure sleeve (51) whose pin (53) is axially parallel to this. Bolt (3) sits on the extension (48) of the bolt (8) part fixed in sleeve (11) so the pressure sleeve (51) and locking-spring (50) can slide axially on the bolt (3). Pins (52) engage the spring (50) turns to prevent the spring sliding out of the sleeve (51). The bottom end of the spring (50) fits rigidly into sleeve (54) to lock the spring in place by means of a pin (55) run into a sloping bore adapted to the spring pitch and led through bolt sleeve and bolt (3). Sleeve (51) pin (53) plugs axi-movably into sleeve (11) bore or sleeve outer slot and thus strikes above into the pin friction sleeve (27). Compression spring (56) presses sleeve (51) onto the fixer sleeve (11) endface in release. Tubular bolt (8) is slotted out (24) for a slider rod (31) whose projecting noses (32) lock positively into ring recesses (33) on the top end of the interposed gears (34).