Patent GB-1044220-A (GB)
Title: Improvements in or relating to combination locks
IPC: E05B37/00
Filed: 1963-07-26
Abstract: 1,044,220. Preventing unauthorised use of I.C. engines. B. E. ETTER. July 26, 1963, No. 29844/63. Heading FIB. [Also in Division E2] A combination lock comprises a plurality of locking discs 42, 44, 46, 48 engageable with an actuating member 64 for selectively permitting displacement of the member, a telephone-type dial 28 outside the lock housing 10 to operate the locking discs, and a link 134 movable on a crankshaft 20 which is connected to the dial and is movable along the circumference of the discs, the link being engageable with the discs to move the same and being capable of passing progressively from one disc to engage subsequent discs when the dial returns to rest position. As shown, the device is applied to the ignition and accessories circuits of a motor vehicle, the crankshaft 20 extending at one end through an end wall of the housing and carries the telephonetype dial 28. A shaft 38 is secured between a pair of legs 36 which extend from the bottom of the housing, and carrier, the locking discs 42, 44, 46, 48, each of which is mounted between a collar 40 and a washer 50, a spring 52 being connected between the collar and the disc. Webs 51 extend inwardly of the walls of the housing to form grooves 54, 56, 58 and 60 in the planes of which the discs are located. The manually operable slidably mounted actuating member 64, normally urged outwardly of the housing by a spring 76, intersects the locking discs 42, 44, 46 and is permitted sliding movement only when notches in discs 42, 44 and 48 are in alignment. Disc 48 which is of smaller diameter than the other discs has no notch. Notches 80, Fig. 3 (not shown), on the member 64 permit rotation of the discs when the discs and notches are in register. A switch box 82 includes switches 84, 86, 88, Fig. 3 (not shown), which extend into the path for member 64 and are normally open when vertically disposed. Switch 88 is in the circuit of the vehicle accessories, such as radio and heater, switch 86 is the ignition switch and switch 84 is in the starting motor circuit. Actuation of the switches is controlled by the sliding movement of member 64, the degree of movement of the latter being determined by a pawl and ratchet arrangement associated with the member 64. A pair of arms 102, 104 pivoted on ears 100 extend respectively from above manually operable slidable members 62 and 66 to positions above pawl 92, Fig. 3 (not shown), and are biased by springs 105 to the position shown. Each of the discs 42, 44, 46 is provided with notches 110, for engagement by one of a plurality of pawls 112 pivoted to the housing and controlled by an arm 114, Fig. 4 (not shown), also pivoted in the housing 10 and adapted to be operated to release the pawls 112, Fig. 2, from the discs by the member 66. A flexible cable 120 connected to the member 66 is adapted to operate at its free end against the link 134 which is slidably mounted on the crankshaft 20. In operation, depression of member 64 to its first position determined by the pawl and ratchet 92, 96, operates the accessory circuit switch 88 only. Depression of member 64 to its extreme position operates all three switches 88, 86, 84. All switches may be returned to their off positions by depression of member 62. The ignition switch 86 is then locked by depression of member 66, which, through the cable 120, moves the link 134 to the position shown in Fig. 5 in which a cam surface on member 66 engages the arm 114 to remove pawls 112 from the notches 110 in the discs 42, 44, 46 which are then rotated to their locking positions by springs 52 to misalign the first mentioned notches in the discs and prevent depression of member 64. The lock is unlocked by dialling a predetermined code on the member 28.