Patent GB-697362-A (GB)
Title: Combination locks
IPC: E05B37/08
Filed: 1951-07-17
Abstract: 697,362. Permutation locks. DIEBOLD, Inc. July 17, 1951 [May 8,1951 ], No. 16954/51. Class 44 A permutation lock comprises a casing 11 secured to the near side 12 of a door 13, a tubular extension 14 on the base 15 of the casing, an operating spindle 16 rotatably and slidably received in the extension 14, notched tumbler discs 22, 22<SP>1</SP>, 22<SP>11</SP> rotatably mounted on the extension 14 and adapted to be set by rotation of a knob. 19 connected to the spindle 16 and a cam member 23 secured to the end of the spindle 16 having a plain cylindrical portion 23g and a notched cylindrical portion 23f of smaller diameter. A bolt 35 sliding in guides 36 on the casing has pivoted thereto a lever 38 having a fence 38c co-operating with the tumblers and a tongue 38b adapted normally to bear on the plain cylindrical portion 23g of the cam but -arranged, when the spindle is pressed, inwardly, after the tumblers have been set, to engage in the notch 23a of the cam portion, 23f, rotation of the spindle then causing retraction of the bolt. The knob 19 carries a dial 20 co-operating with a dial ring and a pin on the cam 23 is adapted to engage a portion of the adjacent tumbler disc 22, which carries a pin engaging a portion of the next tumbler disc and so on. The tumblers are set in turn by to and fro motion of the knob 19. When all the tumblers are set notches 37 therein are aligned with the face 38c on the lever 38. To prevent picking by "feel" the fence is held out of contact with the surface of the tumblers by the engagement of the tongue 38b with the cylindrical surface 23g. The lever is urged to this position by a light spring 39. The cam 23 has a tubular portion 23b, Fig. 5, fitting inside the extension 14, a pin fixed to the extension 14 normally engaging in a circular groove 23h therein. An axial slot 23k joins the groove 23h with a sectional. slot 23m so that when the knob 19 has been turned to the correct final position it aligns the slot 23k with the pin and may be pushed inwardly, the pin then operating in the sectorial slot 23m to limit rotation of the knob. When the knob 19 is pushed inwardly the tongue 38b slips off the portion 23g of the cam on to the notched part 23f. Slight rotation then causes the tongue to engage in the notch 23a, the fence 38c entering the aligned notches 37 in the tumblers, and a further slight rotation causes retraction of the bolt. When the knob 19 is released it is returned to the initial projected position by a spring 50, sloping surfaces on the tongue 38b and the cam portion 23g causing the lever to lift to its normal position resting on the cam portion 23g. Since rotation of the knob is limited when in the pressed in position it is impossible to set the tumblers in this position and further, the drive connection between the cam 23 and the tumbler pack is broken in the pressed in position. Five alternative arrangements are described to allow rotation of the spindle in the normal position, and to limit the rotation when in the pressed in position. In each case it is necessary to make a dial setting for each tumbler and a final setting to align the slot 23k (or its equivalent) with the fixed pin before the spindle may be pressed in to connect it to the bolt.