Patent GB-170288-A (GB)
Title: Improvements in safety locks
IPC: E05B27/10
Filed: 1921-10-11
Abstract: 170,288. Panetty, G. Oct. 12, 1920, [Convention date]. Locks, cases for; keys; lock mechanism, change - key, masterkey; revolving-band.- A lock having relatively movable e members locked together by marked and interchangeable pin - tumblers operated by a key with correspondingly marked and interchangeable key - pins, has an inner cover plate which can only be removed in a predetermined position of the bolt so that only a person possessing the key correctly set can gain access to the pin-tumblers to change them. The key pins also are covered bv a screwed-on disc which can only be removed to set the key-pins when the handle is moved to a definite position. Figs. 2 and 3 show the invention applied to a drawer lock in which the relatively movable parts take the form of a revolving barrel 26 and casing 27. The pin-tumblers 32 are covered by a disc 31 screwed to the casing 27 and held against unscrewing by a pin 36 notched at 36<1> to receive one leg of the bolt 25. This leg has a notch 25' so that when the barrel 26 is turned to move the bolt 25, by a projection P engaging notches 39, 40 on the other leg of the bolt, a position is reached when the notch 25<1> coincides with the pin 36 which can then be removed to allow the pintumblers to be interchanged to alter the combination. When this is done, the key-pins, Figs. 6 and 7, require to be correspondingly interchanged. To effect this, the handle 13, pivoted to the key by lugs 52 engaging holes 51, is moved to a definite position indicated by the dotted lines at 13<11> in Fig. 7, when the cut-away parts of the inwardly projecting pins 52 are aligned with notches 53 in the cover-plate 12, which can then be unscrewed to expose the heads of the key pins. The handle may be turned down to the position 13', Fig. 7, to facilitate carrying it in.the pocket. By suppressing various pin tumblers and corresponding key-pins, a series of locks may be made which can only be released bv the appropriate key with the missing pin or pins, such keys being capable of only opening the corresponding lock. A key having all the pins in position can release any lock. In the construction shown in Fig. 8, two sliding rotating members 46, 47 are locekd to another members 45 by pins tumblers with two divisions or notches, these pin tumblers being conveniently formed by superposed sets of singlydivided pin tumblers. A key with pins positioned as in 41 will enable the member 47 to move while the pin tumblers still hold the members 45 and 46 together. A second arrangement of the key pins or a second key as 42 will enable the members 46 and 47 to move together relatively to the member 45. By this means a lock may be constructed in which two or more keys are necessary for its release. Padlocks.-The Specification as open to inspection under Sect. 91 (3) (a) comprises also a means for locking together the two halves of a padlock casing by passing the shackle 14 through overlapping holes therein after screwing the halves together, and locking the shackle by the engagement of rounded parts P of a rotatable member 17 in recesses R in the shackle legs. This subject-matter does not appear in the Specification as accepted.