Patent GB-190505787-A (GB)
Title: Improvements in and relating to Locks and Keys for same.
Inventor: KAYE WALTER KELITA
Filed: 1905-03-20
Granted: 1906-03-15
Abstract: 5787. Kaye, W. K., and Emmott, T. March 20. Locks, key.-The levers of a number of mortise, rim, cabinet, or other locks are so arranged that each lock may be operated by a subordinate key, while a series of them may be operated by a sub - master key, and all of them by a master-key, the parts being so arranged that it is impossible to convert a subordinate key into a submaster or master key. The tail B of the bolt A, Fig. 1, is guided by the stump B<3> and pin B<4>, and has two key notches C, C' cut in it, one of the key notches lying immediately behind the other. A number of spring- pressed tumblers 1, 2, 3, &c., Fig. 11, say seven in all, are pivoted on the pin B<3>, all of them except tumblers 3, 7 being provided with projections G, Fig. 3, which are adapted to pass through the gate D cut in the bolt head. The tumbler 3 has projections H, J which fit, with a little play, in holes in the tumblers 1,2,4. The tumbler 7 has a stump K, Figs. 9 and 11, which engages with slots K<1>, K<2>, cut in the tumblers 5, 6, in such a manner that the tumblers 5, 6 may be raised independently of the tumbler 7, but when the tumbler 7 is lifted it raises the tumblers 5, 6. The projections D<3>, D<4> on the tumbler 7 engage with curved slots D<1>, D<2> cut in the bolt. When the tumbler 7 is in its lowest position, the projections D<3>, D<4> may pass on either side of the projection D<5> and thus do not impede the motion of the bolt. When the tumbler 7 is in its fully raised position, the projections D<3>, D<4> may pass through the gate D, Fig. 3. The subordinate key engages with the notch C in the bolt and operates the tumblers 1, 2, 4, 5, 6, the tumbler 7 not being raised. The sub-master key engages with the notch C' and operates the tumblers 1, 2, 4, 7. The master-key engages with the notch C' and lifts the tumblers 3, 7, the tumblers 2, 3, 4 being raised by the projections H, J. The bolt is retained in its withdrawn position by means of projections F<1> on the tumblers 1, 2, 4, 5, 6 engaging with a stump F on the bolt. The arrangement of gates described in Specification No. 5311, A.D. 1889, may be employed. If the locks are divided into series which may be operated by the subordinate keys, sub-master keys, masterkeys, and a grand-master key, each lock may be so arranged that the tumbler 7 and notch C<1> are not engaged by the subordinate, or by the sub-master keys, the master-keys and grand-master key alone operating them. In this case, the tumbler 3 has a gate shaped as shown at T, Fig. 20, formed in it, the gate having two offshoots so arranged that a stump M on the bolt-plate may slide along one of them when the tumbler is in either its fully raised or its fully lowered position. This tumbler is not directly operated by the subordinate keys, but is operated by the sub-master, master, and grandmaster keys. The arrangement of the tumblers or levers may be modified to enable the invention to be applied to latch locks. In the arrangement shown in Fig. 13, the sliding bolt B actuates the latch bolt A', the latch bolt being retained in its withdrawn position, when necessary, by means of the vertically-movable plate R. The levers 1, 2, 3, 4, 5, 6 are provided with gates T, Fig. 15, engaging with the stump M on the bolt B, the lever 7 having a corresponding two-armed gate, Fig. 20, which enables the stump M to pass when the lever 7 is in either its lowest or highest position. The levers 1 ... 4 are connected together in the manner described with regard to Fig. 11, the lever 4 being connected to the lever 5 by a pin on the lever 4 fitting in a hole in the lever 5. The lever 7 has a projecting pin which engages with a slot in the lever 6 similar to the slot K', Fig. 9. In this case, the subordinate key lifts the levers 2, 4, 6, the sub-master key lifts the levers 1, 7, and the masterkey lifts the levers 3, 7. The relative positions of the levers may be altered, and the tail of the bolt may be arranged between the levers.