Patent GB-690468-A (GB)
Title: Improvements relating to locks for bicycles and motor cycles
IPC: B62H5/06
Filed: 1951-11-20
Abstract: 690,468. Sliding bolts. HINDS, L. E. Nov. 20, 1951 [Nov. 22, 1950], No. 27235/51. Class 44 [Also in Group XXXI] A lock construction for a motor-cycle or bicycle of the type having a shiftable member forming a part of the cycle steering assembly and a juxtaposed frame bracket forming a part of the cycle fixed frame structure, is characterized by the provision of a lock housing having at one end thereof means interfitting with and anchoring the housing to the frame bracket, there being a locking bolt longitudinally and rotatably shiftable within the lock housing having an abutment piece thereon engageable and co-operable with the shiftable member of the steering assembly when the locking nut is in a predetermined position and when the steering assembly has been secured to one side, to effect the blocking of return of the steering assembly to mid-position, and lock means carried by the lock housing for releasably and selectively locking the locking bolt from its longitudinal and rotatable movement. In the arrangement shown, in which front forks 15, 16, Figs. 3 and 4 of a motorcycle are rigidly connected to a steering column 23 by a V-shaped strut 24, a lock housing 28 is rigidly secured by means of a lug 30, to an apertured lug 22 provided on a downwardly angled socket 19 of a steering head 18. The housing is retained substantially parallel with the strut 24 by an abutment 36 and a shoulder 37 on the housing and lug 22 respectively. A rod 38, Fig. 7, is slidable in a tubular portion 29 of the housing 28 and carries a claw element 40 which, when the front fork assembly is turned and the rod 38 is subsequently withdrawn and turned through 90 degrees is adapted to lockingly engage the adjacent arm 25 or 26- of the strut 24. The rod 38 is locked in the operative and inoperative positions by means of a lock assembly 53, a housing 54 of which is retained in a tubular part 35, having a bore 47, which is off-set from and intersects the tubular portion 29. The rod 38 is formed with recesses 45 and 46, Fig. 10, substantially at right angles to one another, either of which will prevent rotational and longitudinal movement of the rod 38 when the recesses are engaged by a rod 48 in the bore 47. A cylindrical recess 49 is formed in the rod 48 to permit rotational movement of the rod 38 when the rod 48 is rotated. In the inoperative position of claw element 40 the cylindrical surface of rod 48 is engaged in recess 46. In order to bring the claw element into its operative position, the rod 48 is rotated to bring recesses 46 and 49 into registry; the element 40 can then be rotated to a vertical position in which it is held by subsequent rotation of rod 48 into recess 45. A flat on the rod 38 is aligned with recess 49 to enable the rod 38 to be moved outwardly between limit stops 51 and 52. The rod 38 is then moved to engage one of the arms 25 or 26 and the rod 48 hereafter rotated to bring the cylindrical surface thereof diametrically opposite recess 49 into recess 45. The lock assembly 53 includes a keyoperated barrel 59 by which the rod 48 is rotated through a rod 61 secured to the end of rod 48 and engaging the barrel 59. Where the cycle is not provided with an integral lug 22, the lock housing may be secured to the machine by a clamp device presenting a lug similar to lug 22.