Patent GB-964610-A (GB)
Title: Code lock
IPC: E05B37/00
Filed: 1962-07-03
Abstract: 964,610. Code locks. C. A. NORREMARK. July 3, 1962 [July 3, 1961 (2)], No. 25543/62. Heading E2A. A code lock comprises a first tumbler having peripheral teeth some of which are spaced in accordance with a predetermined code, a second tumbler having peripheral teeth and relatively rotatable to the first tumbler, a radially extending slot in each tumbler, means for linearly displacing the tumblers relative to deflector means, the deflector means being adapted to circumferentially deflect the teeth on a respective tumbler during such linear movement to turn the tumblers into and out of a predetermined disposition relative to said deflector means, displaceable means engageable in the radially extending slots simultaneously when both tumblers are in the predetermined disposition, and a lockable member adapted to be released from a locked disposition when said displaceable means is engaged in both slots simultaneously. The code lock comprises a front plate 1, side walls 4, 5 and a rear plate 4, the front plate having openings 5, 6, 7, 8 behind which is arranged a spring-loaded guide plate having an edge 10 extending into the slot 8. Behind the guide plate 9 is mounted a manoeuvring slide 13, resting on ribs 4 of the front plate 1, and provided with a slot 16 and side parts 15 which glide against the inner walls 2, 3 of the plate 1. A setting slide 17 carries a pin 18 extending forwardly through slots 16, 12 and 6 and rearwardly through tumbler discs 19, 20, disc 19 resting on an annular rim 21 on the slide 17. Between the tumbler discs is mounted a domed spring 23. The side parts 15 of the manoeuvring slide 13 are fastened to pawls 24, 25 mounted for engagement with teeth 26, 27 and 28, 29 of the respective tumbler discs 19, 20 and have tongues extending into slots 30, 31 in the slide 13. On the inner side of the rear plate 4 is a release slide 32 bearing a cam 36 for engagement with a nose 38 of the manoeuvring slide 13. On the inner side of plate 2 is a spring blocking plate 39 having a tongue 41 displaceable in slot 42, and formed with an aperture 43 co-operating with the tongue 33 of the release slide 32. To unlock the lock the slide setting 17 is moved to the left and right bringing the toothed sections on the tumbler discs 19, 20 into co-operation with the pawls 24, 25 respectively; wherever this takes place the disc 20 is moved one tooth forward but the disc 20 is only moved provided there is a tooth in the right position. Hence, the notches 44, 45 on the respective discs remain together provided that the correct sequence of operations is followed. After the correct number of displacements has been made, the notches 44, 45 are positioned vertically under the pin 18, whereupon the pin 18 and manoeuvring slide 13 are pressed downwardly carrying the blocking slide 39 with them by means of the tongue 41. The release slide 32 is now free to be used to displace a latch, close a circuit or displace a solenoid. To lock the lock the pin 18 is moved upwards so that the nose 38 of the manoeuvring slide 13 abuts the cam 37 and raises the slide 13 to the left of Fig. 3. Simultaneously the discs 19, 20 are moved free of the tongue 41 of the blocking slide 39 which moves upwards by spring means when the tongue of the release slide has moved free of the incision 45, the blocking slide 39 will be displaced so that the tongue of the release slide 32 is free of the incision 45, and the blocking slide 39 will be displaced so that the incision 43 is moved relative to the tongue 33 and the slide is blocked. The tongues 46, 47 on the tumbler disc 20 are brought into engagement by further movement of pin 18 into engagement with cams 48 on the inner side of plate 2, thus clearing the tumbler disc 20. Due to a linkage projection 49 on the disc 19, this disc is cleared with movement of the disc 20. The guide plate 9 carries the pin 18 back to its neutral position.