Patent GB-1346776-A (GB)
Title: Locking mechanisms
IPC: B60R25/06
Filed: 1971-04-19
Abstract: 1346776 Anti-theft devices WASO Ltd 19 April 1971 [18 March 1970 8 May 1970 9 Oct 1970] 13049/70 22375/70 and 48171/70 Heading B7J [Also in Division E2] A key operated locking mechanism for locking against longitudinal movement, a longitudinally movable shaft 2 of a gear selecting device, comprises a generally tubular body 9 secured to a gear-box selector shaft assembly housing a key operated lock cylinder 10 within the body, a drive member 12, 26 supported for rotation about the longitudinal axis of the body, a portion of the drive member within the body for actuating an electric switch, a spring for biasing the drive member from one position relatively to the body to another position, a separately formed member bolt 4, ball 36, pin 41 or slide 46 releasably secured to or adjacent the drive member and a shaped surface being formed; on the separately formed member at a position remote from the drive member for engaging the shaft. The lock body is secured by bolts 8 to the housing 1 surrounding the selector shafts. The bolt operating member 12 is movable longitudinally and rotatably by actuation of the lock and is connected at an angle to the bolt 4 by a pin 13 engaging a slot 14 in the bolt for projection and withdrawal thereof. An abutment portion 5 of the bolt engages in a notch 6 of the shafts in locking position when the gear lever is in neutral or reverse position. The lock cylinder operates a cam which actuates an electric switch 13A in the ignition circuit. As shown in Fig. 5 in which the locking member is the ball 36 which is restrained in locking position by the drive member 26 the member is released by rotating the member 26 by actuating the cylinder lock so that a recess 35 in the member is aligned with the ball to allow it to move out of the notch in the shaft. As shown in Fig. 7, the drive member has a conical end portion which engages the locking pins 41. The pin and barrel may be at right angles. The drive member 26, Fig. 9, has a protrusion 45 which engages in a slot in a locking member slide 46 for moving the locking member so that it either locks the shaft or so that a cut-out in the slide releases the shaft. The drive member may have a detachable end portion and they may be separately and removably retained in the lock body by circlips. The lock barrel may be moved axially towards a locking position and then turned to lock the shaft. The body may have an inward bored extension housing a spring urging a ball into a notched undersurface of a peripheral skirt of the drive member, Fig. 13 (not shown), the ball engaging a notch in "an ignition on" and "accessories on" position and a torsion spring surrounding the drive member is tensioned in the "ignition on" and "start" positions. The bolt may be spring urged to the locking or withdrawn positions. The key cannot be removed until the shaft is locked. A visual or audible alarm may be automatically actuated by withdrawing the key when the shaft is unlocked, the key moves a slidable keyhole flap connected to a terminal which closes a switch in an electric circuit, a further switch may be operative to prevent the starter being operated with the vehicle in gear.