Patent GB-385841-A (GB)
Title: A combination lock
IPC: E05B37/00
Filed: 1932-05-19
Abstract: 385,841. Latching and unlatching switches. DUNCAN, W. C. N., Mullewa, Western Australia. May 19, 1932, No. 14228. [Class 38 (v).] A lock, more especially for locking the switch elements 59, 62, Fig. 8, of the electrical installation of a motor vehicle against relative angular movement, comprises a pin 17, Figs. 1 and 2, at one end of a link 16 which is pivoted at the other end to an arm 15 carried by a stub shaft 13 to which is connected an operating handle 14, and this pin is adapted to engage in succession a series of projections 33 carried on a series of rings, each ring having a single projection and being frictionally held in a groove between one of a number of concentric walls 20 .. 24 projecting from a plate 19 secured in the lock casing below the face 12 thereof, the pin in 17 being deflected successively from one groove to the next by members 30, 31, 32 which bridge the spaces between the walls. A plate 43 is carried by a sleeve 50, which is slidable along a hollow shaft 35, which carries the plate 19, the plates 19, 43 being normally pressed together by a spring 52, .and maintained in relative angular position by pins 44. A series of pins 45 .. 48, screwed in any desired order in series of holes in concentric rows in the plate 19, each hole corresponding to a letter of the alphabet, may engage, when the switch is closed, in corresponding holes in the plate 43. To turn off the switch, an operating knob 64 carried on the shaft 35 is turned to the left, Fig. 8, to rotate the switch-bridging element 62 from between contact elements 59, 60 on an insulating disc 58, the plates 19, 43 turning together through the pins 45 .. 48. The handle 14 is then turned to the left to lock the switch by pushing the plate 43 away from the plate 19, by cam projections 33, 36 which are operated by a projection 18 on the lever 15, and so disengage the pins 45 .. 48 from their holes in the plate 43. At the same time the projections 33 on the rings are engaged by pins 41 on a re-setting member 40 carried on the shaft 13 and are thereby moved back to zero position. A pin 54, supported to slide in bearings on a fixed shaft 55, is simultaneously moved longitudinally, by the engagement of a projection 42 on the member 40, which is pressed against a spring 39 in contact with the rod, to move a stop 57 out of the path of wings 49 connected to the hollow shaft 50. To unlock the switch, the handle 14 with the setting pin 17 is moved to engage the projection 33 on the rings, and bring them successively, by the aid of letters on the face plate 12 and an indicator on the handle 14 in accordance with the pre-set letter or word combination so that the holes therein are in alignment with corresponding holes on the plates 19, 43 and with holes in the rings adjacent the projections 33 to permit the pins 45 .. 48 to engage therein under spring action. The wings 49 having also been withdrawn from recesses in the shaft 55, the knob 64 which operates the switch may be turned, incidentally turning a cam-shaped collar 61 to push the pin 57 into obstructing position for engagement by the wings 49. The locking mechanism may be withdrawn for re-setting by turning the knob 64 until projections 11 in the casing 10 are in register with recesses in the plate 19.