Patent GB-466927-A (GB)
Title: Combination lock
IPC: E05B37/00
Filed: 1936-06-23
Abstract: 466,927. Permutation locks. HAGE, O. A. June 23, 1936, No. 17416. Convention date, July 9, 1935. [Class 44] A permutation lock, comprising a number of rotatably mounted tumblers actuated by movements of a single spindle extending to the front of the door, is provided with an abutment which can be rotated around the spindle successively to prearranged positions to act as a stop for limiting the movements of the central spindle so as to prevent accidental oversetting of the tumblers. A number of toothed wheels 19 each having a notch 21 is mounted on a stud 18 carried by a slidable plate 15 and the wheels normally mesh with corresponding toothed rings 28 mounted on a boss 12 on the lock case. The wheels 19 and the rings 28 are separated by non-rotating rings. Mounted to turn and slide in the boss 12 is a member 43 having an arm 46 and finger 47, Fig. 9, and the member 43 is secured to a spindle 48 extending through the door. The bolt 55 has a slot 57, 58 engaging a pin 79 on a lever 75 which has a projection 78 extending across the wheels 19 so that the bolt cannot be withdrawn until all the notches 21 are brought beneath the projection 78. Each ring 28 has two abutments 32, 33, and two rings 38 on opposite ends of the group of rings are bridged by a member 40 normally resting against the abutments 32. Projections 30 on the rings are arrested by a stop 14 when in their normal position, and the arm 46 is held by a pawl 64. The spindle 48 passes through a plate 100, Fig. 12, on the outside of the door and carries a plate 107 having two notches 110, 111 and a projection 112. Mounted on the base plate 100 is a fixed block 143 and adjacent to it a block 146 is mounted to slide on a pin 147 and is normally pressed against a plate 144, Fig. 16, secured to the block 143, by a spring surrounding the pin. Both blocks have grooves 150, 151 to admit the plate 107 and the end grooves 154, 156 on the block 143 permit the passage of the projection 112. The outer end of the block 146 is bevelled to permit the passage of the projection 112 in a clockwise direction past its end but not in the reverse direction. A hinged stop 134 is carried by a pin 133 on a circumferentially adjustable cover plate having markings on its flanged edge visible through a hole in the outer cylindrical casing to enable the stop to be set in any desired position. An abutment 135 on the stop is engaged by the projection 112 on each clockwise motion of the spindle 48. To actuate the lock, the spindle 48 is drawn forward to draw the arm 46 clear of the pawl 64, the gap 111 in the plate 107 clearing both blocks 143, 146, and after setting the stop 134 to the first letter of the combination the spindle is turned clockwise, as viewed from the front of the door, to cause the finger 47 to engage the abutment 33 of the first ring 28, the stop 134 preventing it from being moved too far. The spindle is then turned backwards and the projection 112 strikes the block 146 and the gap 110 comes opposite the block 143. After resetting the stop 134 the spindle 48 is then pressed inwards carrying the block 146 with it for a distance enabling the finger 47 to come opposite the second ring 28. The spindle is then turned clockwise again, the block 146 returning to its first position as the gap 110 passes it and the plate being now guided by the second groove in the block 143. The movement is continued until the projection 112 again strikes the stop 134. The process is repeated until all the rings have been moved and the plate 112 reaches the end slot 156 which permits the passage of the projection 112. The arm 56 can then continue turning until it engages a notch 59 in the bolt which is then withdrawn, the projection 78 on the lever 75 entering the aligned notches 21 in the wheels 19. Simultaneously, the arm 46 raises a lever 92, Fig. 11, out of blocking engagement with a pin 89 on the bolt. Reverse movement of the spindle shoots the bolt and continued movement causes the finger 47 to engage the member 40 and all the rings 28 are returned to their normal position. The back cover of the lock has projections engaging undercut slots 86, 87 in the lock sides and is normally prevented from moving in one direction by the pin 89 on the bolt when the latter is shot and in the opposite direction by a pin 88, Fig. 11, engaging the edge of a pivoted lever 81 normally resting against a stop 82. In addition, an abutment 96 on a pivoted lever 93 engages a pin 68 on the back cover when the bolt is shot. As the bolt is withdrawn the arm 46 raises the lever 93 to bring an abutment 97 opposite the pin 68 and a hook 66 on the pawl 64 engages the opposite end of the lever and retains it until the arm 46 releases the pawl as the arm is returned to the initial position shown in Fig. 1. The back, therefore, cannot be removed when the door is open by anyone not knowing the combinations. To change the combination the tumblers are reset as for opening the door, but instead of withdrawing the bolt completely the arm 46 is arrested in the position shown in Fig. 11 to bring a gap 90 in the lever 93 opposite the pin 68. The cover can then be slid laterally to remove it giving access to an arm 72 on an eccentric which engages a notch in the plate 15. By turning this lever through 180‹, the wheels 19 are brought out of mesh with the rings 28 which can be set to a new combination using the spindle 48 as before. To prevent the arm 46 from hitting the member 40 at the end of this process, the lever 81 is moved up to a stop 91 where it lies in the path of the arm. When the new combination has been set the lever 72 is moved back again to remesh the wheels and rings and the back cover is replaced, the pin 88 restoring the lever 81 to its initial position.