GB760581A - Improvements in or relating to anti-theft devices for use with scooters, motor-cycles or cycles - Google Patents

Abstract

760,581. Cycle locking devices. NEIMAN, A. June 5, 1953, No. 15554/53. Class 79(3). [Also in Group XXV] An anti-theft device for motor cycles comprises a lock 3, Fig. I, having a lock bolt 5 for locking a steering head bracket 2 to the frame 6, and a bolt 9 by which the bracket 2 is secured to the steering spindle (not visible in Fig. 1) so that turning the lock to its open position, in addition to unlocking the bracket 2, permits direct manual removal of the bolt 9 upon the clearance therefor being provided by removal of the lock. When the lock 3 is in position in its casing on the head 2, it partly covers the head of the bolt 9. The latter is disposed tangentially to the base of a peripheral groove formed in the steering spindle. This prevents the head 2 from being removed if the nut at the other end of the bolt 9 is removed. On unlocking the lock 3 and removing it from the casing, the bolt 9 can be withdrawn through a recess 10 in the outer wall of the casing. In Fig. 5, a torsion spring 32 tends to rotate the rotor 31 of the lock to locking position, in which a holding member (not visible in Fig. 5) engages a recess 15 in the lock casing, in the locking position of the bolt 5. A further recess 16, similar to the recess 15, but nearer to the outer end of the lock casing, provides for retention of the lock in the casing when in a steering-unlocked position. This prevents accidental re-engagement of. the lock-bolt with the frame 6. The lock is outwardly urged by the action of a spring 17. A detachable stop 19 prevents ejection of the lock from the casing. In Fig. 7, the lock casing 20 is rigidly secured to the head of the bolt 9. In Fig. 9, a tumbler type lock 24 has a recess 24<SP>11</SP> in which a ball 26 is disposed when the lock is in its unlocked position. When the lock is turned to its locked position, Fig. 10 (not shown), the ball 26 rides clear of the recess 24<SP>11</SP> and is projected upwardly so that it obstructs the head 27 of the bolt 9. The locking pin 25 is actuated by a pin 24<SP>1</SP> carried by, and eccentric with, the end face of the lock 24. The pin 24<SP>1</SP> engages a kidney shaped slot, Fig. 13 (not shown) in the pin 25 so that there is 180 degrees of lost motion. This permits of having an operative travel of 360 degrees instead of 180 degrees and thus avoids the need for two sets of tumblers (otherwise the pin 25 would be projected in the first 180 degrees of movement, and then retracted again). In Fig. 11, a projection 29 on the pin 25 engages a recess in a disc 28. This results in the disc 28 being partly projected to obstruct the bolt head 27 when the lock 24 is in its locked position, Fig. 12 (not shown).