Patent GB-422402-A (GB)
Title: Improvements in and relating to permutation locks
IPC: E05B37/02
Filed: 1934-07-09
Abstract: 422,402. Permutation locks; locking switches. SAUERWEIN, F., 56D, Groosbeerinstrasse, Berlin. July 9, 1934, No. 20158. [Class 44] [See also Group XXXVII] A permutation lock-mechanism applicable generally and particularly described as applied to controlling bolt fastenings and to operating electric switches in the lighting and ignition circuits of a motor vehicle, provides means for changing the combination and for giving an alarm on attempt to operate the lock without correctly setting. Each locking disc element 15, Figs. 1-3, provided with an internal slot 16, is loosely mounted on a corresponding spindle 3 slidable and rotatable in bearings 2 which retain the discs against axial movement. The spindles are aligned in pairs, adjacent ends of each pair of spindles being connected by a block 4 with pins 6 engaging annular grooves in the spindles so that they can rotate independently but slide together axially when operated by the block. Each spindle has a pin 17 normally positioned in a recess in one or other of the bearing members 2, in which it is retained by the face of the disc 15 to hold the spindles against sliding movement, unless discs 15 have been set to register their slots 16 with the pins 17. The spindles are held against unintentional rotation by spring detents 18 engaging the toothed outer ends 19 of the spindles, but may be rotated to a new setting by discs 15 when, as shown, the pins 17 are engaged in the slots 16. Sliding movement is given to the spindles by a transverse member 9 on a boss 10 mounted in a bush 12 and rotatable by a knob 14, the ends of member 9 having projections 8 pressed into engagement with recesses in the lower faces of blocks 4 by a spring 13. When members 15 are correctly set, knob 14 is free to rotate and slide the spindles, but if one or more of the spindles is held against sliding by an incorrectly set disc 15, rotation of knob 14 is limited by projections 8 riding partly out of their recesses until member 9 contacts with the upper face of bush 12. The axial movement thus given to boss 10 may operate a switch, not shown, in an alarm circuit. Figs, 4, 5, show a modification. Tubular spindles 21 are mounted in bearings and are connected in aligned pairs by rods 22 having squared centre portions 23 and terminal springs 26 engaging notches in the ends of the spindles to hold the spindles against unintentional rotation. Each spindle has a locking element 29 loosely mounted thereon and provided with a slot 30 adapted to be brought into register with a pin 28 on the spindle. A rotatable tube 32 with slots 36 and operating knob 31 houses a spring 33 bearing on a transverse member 37, the ends of which project from the slots 36 and have pins 38 engaging recesses in the parts 23, to impart sliding movement to rods 22 by rotation of knob 31. Parts 23 have forked extensions 40, 40<a> engaging eccentric pins on plugs 41, 41<a> of insulating material rotatable in insulating blocks 45, so that the plugs are rotated by sliding movement of rods 22. The plugs 41, 41<a> have conducting segments, not shown, co-operating with contacts in the blocks 45. As applied to a door &c. fastening, member 32 may carry an arm engaging and operating a sliding bolt.