Patent GB-692216-A (GB)
Title: Safety-lock and key
IPC: E05B27/00
Filed: 1950-10-20
Abstract: 692,216. Locks. CONCRETA INSTITUT REG. TREUUNTERNEHMEN. Oct. 20, 1950 [Oct. 25, 1949; June 23, 1950], No. 25664/50. Class 44 A lock comprises a key cylinder operated by a key and rotatably carried in a body having a dog operating the lock bolt, the said body being rotatably mounted in a casing, with movable locking means between the key cylinder and the body and between the body and the casing, and means actuating said locking means when the key cylinder is rotated to unlock the body from the casing and lock it to the key cylinder. The lock, shown diagrammatically in Fig. 1, comprises a rotatable cylinder 2 into the bore of which the key 1 is inserted. A pin 4 in a cross bore in the key-shank is movable against the action of a spring, and cooperates with radial pins 5, 6, in the cylinder 2. The cylinder is coupled to the key, e.g. by pins and grooves, and turns with it. The outer end of pin 5 engages an internal cam surface 7 on an annular member 9 and is slid inwardly, causing movement of the pins 4 and 6. Pin 6 co-operates with a detent element in the form of a spring-loaded lever 10 carrying at its face end a pin 13 which projects from the rotating parts and in the locked position engages in a recess 14, Fig. 3, in a component 15 fixed to the casing. After a predetermined rotation of the key and key cylinder, the transverse movement of pins 5, 4 and 6 moves lever 10 so as to shift pin 13 from recess 14 into an annular groove 17 so that member 9 is free to be turned by further rotation of the key. A dog 8 on member 9 then operates the bolt. In another form, shown diagrammatically in Fig. 4, radially disposed pins 5, 6 in the key cylinder 2 engage movable cams 19, 20 which carry pins 13, 13<SP>1</SP>. The pins 5 and 6 are moved inwardly by the cams, but such movement is limited by abutments 21, 22 in the transverse bore in the key shank which can only move inwardly to a limited extent against a spring. At the limiting position of the pins, the cams 19, 20 are moved outwardly by the pins 5, 6, and the pins 13, 13<SP>1</SP> are moved out of recesses and into an annular groove in a fixed component of the assembly. The form shown in detail in Figs. 7, 8 and 9 operates on the principle of the arrangement of Fig. 1. The key cylinder 2 carries resiliently mounted radial pins 5, 6. The outer end of pin 5 runs on a cam 23 which is circular over its central range 24. The inner ends of pins 5 and 6 co-operate with a pin slidable transversely in the shank of the key and the outer end of pin 6 has a nose 25 which co-operates with a recess 26 in a circular ring segment 27. Further pins 28, housed in the key cylinder 2, are displaced to release the cylinder on the insertion of the key, as in the usual type of barrel lock. The cam 23 is formed in a disc shaped member 29 connected at its outer periphery to the annular member 9 which causes the dog 8 operating the lock bolt. The disc member 29 carries two sliding catches 30, 31 which have pins 32 extending on both sides parallel to the axis of the lock on one side, into stepped slots 33 in the ring segment 27, and on the other side into recesses in the fixed component 36 (Figs. 8, 9), these recesses opening from an annular groove. A further catch 37, carrying a pin 38, is provided on the disc 29 and effects interlocking of the key cylinder 2 with the annular member 9. The key, Fig. 12, has two tenons 41 at the shoulder which engage in recesses 42, (Figs. 8, 9) in the cylinder 2, and a transversely slidable pin 44, Fig. 12, normally held in central position by spring-loaded slides 45. When the key is inserted, pins 28, Figs. 7-9, are shifted outwardly, and the key cylinder 2 can then be turned by the key. On passing from the central part 24 of the cam 23, the pin 5 is displaced inwardly, and moves pin 44 in the key shank, which in turn displaces pin 6. As the cylinder is turned further, pin 6 engages catch 30, which moves outwardly, so that one part of pin 32 moves outwardly in slot 33 while the other part moves out of the recess in the annular groove in fixed component 36. At the same time the nose 25 of pin 6 enters the recess 26 in the ring segment, causing the latter to turn with the cylinder. On further rotation, the key cylinder is interlocked with the annular body 9 by means of the catch 37. In a modified form, Fig. 15, the key cylinder 2 has teeth meshing with two planet pinions 61, 62 which mesh with internal teeth on the component 9. A further pinion 64 is mounted on a pin 6 carried by the key cylinder and guided in a curved slot 65 in component 9. The latter is normally locked to a fixed component 66 by radially movable members 67, 68, 69. The internal teeth in the region of the member 67 are made resilient radially. Rotation of the cylinder 2 causes pinions 61, 62 to roll around the internal gearing until pinion 62 makes contact with pin 5 of the cylinder and with member 68, while pinion 64 depresses member 69, releasing the component 9 to operate the lock.