Patent GB-192616-A (GB)
Title: Improvements in or relating to locks
IPC: E05B63/02
Filed: 1922-02-14
Abstract: 192,616. Kampmann, G. S. R. Feb. 14, 1922. Lock-mechanism, tumblertype; lever-type; slider-type.- In a springless pivoted- or sliding-tumbler lock, each tumbler is connected by a pin-andslotarrangement to an associated member, forming a series of pairs such that when one of the members of a pair is moved away from the key, the other member moves towards the key. This co-operative movement of the tumblers and their associated members enables the key to position the tumblers, directly or indirectly, for locking and interlocking. Fig. 11 shows one form of the lock in which a gated lever 46, pivoted at 29 to the casing, has a pin-and-inclined-slot connection with a member 45 pivoted to the casing at 28. When the bolt is fully withdrawn, the keybarrel 33 has its slot 43 vertical and the cam 37 in its uppermost position with its right-hand side in contact with the depressions 59, 60 on the member 45 and lever 46 respectively. To lock, the key, Fig. 3, is inserted into the barrel 33 and turned to the right. The bit 25 first engages the edge of the lever 46, moving it away from the key, i.e. to the right, bringing the lever into position for the stump 40 on the bolt 38 to pass into the narrow connecting channel of the gating 57. Meanwhile the movement of the lever away from the key has caused the member 45 to move towards the key until the bit 24 is in contact with ;t. In this position, both the member 45 and the lever 46 have their edges in contact with the corresponding key bits and the stump 40 is opposite the channel connecting the gatings. The movement of the member 45 towards the key bit 24 checks the movement of the lever against flicking past its correct position by undue pressure on the key since contact of the member 45 with the bit 24 arrests the lever in its correct position. On further turning the key, as shown in Fig. 11, the bits 24, 25 move idly over the curved surfaces 59, 60, of the member 45 and lever 46 which remain stationary, but the bit 23 engages the talon of the bolt to shoot it, moving the stump 40 into the upper part of the gating 57. On continuing the rotation of the key, the cam 37 on the key-barrel 33 is turned also, and comes into contact with the member 45 which is pushed by it away from the key, i.e. to the right. This movement of the member 45 imparts a movement towards the key to the lever 46 by reason of the pin 53 and slot 54, disaligning the stump 40 and the channel c between the gatings in the lever and so locking the bolt. The cam 37 is so proportioned that in its final position, the depression 59, 60 in the member 45 and lever 46 respectively are both engaged by its edge in ,order to prevent relative motion between the pair of members and to prevent ascertaining the necessary length of the key bits necessary to operate them to release the bolt. Several pairs of such members may be used and the key bits may act directly on the levers for unlocking and indirectly for locking, or vice versa. In the form shown in Fig. 14, the cam 37 and key-barrel are dispensed with, the members and levers themselves having additional key engaging pro. jections on their edges for effecting their return to the normal position after operation. Fig. 14 shows the bolt 117 in the slot position. To unlock, the key Fig. 20, is inserted over the pin 114 and turned. The bit 132 first engages the curved edge 128 of the lever 127, moving it away from the key and bringing its stump 131 into line with the channel 120 of the gating to the bolt. Meanwhile the curved edge 124 of the member 122 has moved into contact with the key bit 126 and the key on further turning retracts the bolt by its bit 119 which engages the bolt talon, the hits 132, 126 remaining in contact with the depressions 128, 124 of the lever and its associated member without moving them. This brings the lower part of the gating of the bolt into the path of the lug 131 on the lever 128 and further turning of the key causes the bit 132 to engage the projection 129 on the lever, directly rocking the lever into the locking position. When the bolt is shot, the lever is rocked indirectly into locking position by motion imparted to it by the member 122 which has a projection 125 engaged bv the key in turning, after it has shot the bolt. Several pairs of tumblers or levers and their associated members may be employed. In both modifications, sliding tumblers and members may be employed instead of pivoted ones, connected by a. similar pin and slot arrangement and guided in suitable guides.