Patent GB-1151202-A (GB)
Title: Improvements in and relating to Cylinder Lock Mechanisms
IPC: E05B47/00
Filed: 1966-07-20
Abstract: 1,151,202. Cylinder locks. HUWIL-WERKE HUGO WILLACH & SOHNE. 20 July, 1966 [31 July, 1965; 7 Feb., 1966], No. 32500/66. Heading E2A. A cylinder lock mechanism comprises a stationary outer cylinder, an inner cylinder rotatably journalled in the said outer cylinder and having a cavity for the insertion of a permanently magnetized key, permanently magnetized tumblers and a coupling member having an end portion carrying a follower for operating the bolt of a bolt mechanism, wherein the coupling between said inner cylinder and coupling member is disengaged when the lock mechanism is in a locking condition so that the said inner cylinder is idly rotatable and wherein said coupling member is coupled with the said inner cylinder by the insertion of a correct permanently magnetised key into said cavity. A number of constructions are described. In the construction shown in Fig. I the coupling member 7 surrounds the inner cylinder 6 and the outer cylinder is not shown on each side of the key cavity 6a there is a recess 6b in the inner cylinder, each of which in the locking condition receives one of the pair of. tumblers 2a, 2b which are used in this construction. The magnet poles of the tumblers are so arranged that they attract each other. When the key is inserted into the cavity 6a the disposition of its poles is such that the tumblers are repelled and enter cavities 7a in the coupling member, so coupling the inner cylinder to the coupling member; both the tumblers and the key have a plurality of magnet poles arranged in any desired pattern but with unlike poles of the two tumblers adjacent each other so that the tumblers attract each other, the poles of the key being arranged so that unlike poles of the key and tumblers are opposite each other so that the tumblers are repelled by the key. A modification is described which has more than one pair of tumblers. In a second construction Fig. 4 the coupling member 56 is disposed behind the inner cylinder 52 and the mechanism includes a coupling body 54 which is moved manually to couple and uncouple the coupling member and inner cylinder. For this purpose the coupling body is provided with two pins 59 which are normally disposed in holes in the inner cylinder and which when the coupling body is moved axially enter holes 50 in the coupling member. The coupling movement can only take place when two tumblers are disposed in the correct position; the two tumblers are disposed in pockets, one on each side of the key cavity and the tumblers are rotatable and each has a notch 57 which in the unlocking position receives a lug 58 of the coupling body when the coupling body is moved axially to coupling position. The tumblers are moved to the unlocking positions by the key, the disposition of the poles of the key and the tumblers causing the tumblers to rotate; when the key is withdrawn, the withdrawal also causes the tumblers to rotate so that the notches are moved out of alignment with the lugs. In a third construction Fig. 6 the coupling member 16 surrounds the inner cylinder 12 and a coupling body 14 is provided which is urged to the coupling position by a spring 19, the coupling body being mounted in a radial opening and the coupling member having a recess 20 in which in the coupling position, a foot portion of the coupling -body is received; the inner cylinder has two recesses one on each side of the key cavity each of which contains a tumbler 13 the tumblers being movable axially from locking positions to unlocking positions when the key is inserted into the key cavity, the coupling body, when the tumblers are in the unlocking positions, entering notches 17 in the tumblers so that the foot porion can enter the recess 20. In the locking positions of the tumblers the coupling body rests on the tumblers. The key has a chamfered recess 22 to enable the coupling body to enter the notches 17 and the chamfering, when the key is withdrawn, raises the coupling body out of the notches so that the tumblers are able to move with the key when the key is withdrawn. The key has a pattern of magnet poles and the tumblers have corresponding patterns. In a fourth construction Fig. 8 the coupling member 28 is arranged behind the inner cylinder 24 and the inner .cylinder is rigidly connected to a coupling ring A and there are three other coupling rings B, C, D arranged between the ring A and the coupling member; each of the rings B, C, D and the coupling member have a pair of diametrically positioned radial cavities which contain the tumblers in the locking positions of the tumblers and each ring has an annular portion which overlaps the next ring in the case of the rings A, B, C, the annular portion of the ring D overlapping a portion of the coupling member; each of the annular portions has a pair of apertures into which the tumblers are repelled when the key is entered into the cavity in the inner cylinder to couple the rings A, B and C together and to couple the ring D to the coupling member; the pairs of tumblers are normally retained in their looking positions by mutual attraction between the members of each pair. In a fifth construction Fig. 9 the inner cylinder is also rigidly coupled to a ring E and there are additional coupling rings F, G, H and I surrounding the inner cylinder and the tumblers are normally contained in chambers in the rings E, F, G and H and in chambers in the intermediate member 35, the tumblers being moved by insertion of the key into the cavity in the inner cylinder so that they partially enter other chambers in the rings F, G, H and I to couple the rings together and to the coupling member; the key moves the two tumblers which are normally contained in the chambers in the coupling member in the opposite direction to the movement of the other tumblers against the repulsion of the next pair of tumblers normally contained in the chambers in the ring H so that two pairs of tumblers enter the chambers in the ring I. When the key is withdrawn there is mutual repulsion between the pairs of tumblers in the ring I so that they move in opposite directions to uncouple the ring I from the coupling member and the ring H and at least some of the other tumblers are moved to the uncoupling positions by withdrawal of the key. In a final construction Fig. 10 the coupling member 41 is disposed behind the inner cylinder 37 in the outer cylinder 40 and it has a pair of coupling pins on its rear face which can enter holes 42 in the coupling member when the inner cylinder is moved axially by manual pressure so that the inner cylinder is coupled to the coupling member; a spring 44 is disposed between the inner cylinder and coupling member so that they are normally uncoupled. Cowling is normally prevented by six tumblers 38 which couple the inner cylinder to the outer cylinder; the inner cylinder is provided with three annular grooves 46 which in the uncoupled position of the inner cylinder receive the tumblers which are slidably mounted in chambers in the casing, the chambers being capable of wholly receiving the tumblers in the unlocking positions. The tumblers are repelled to the unlocking positions by the key when it is entered into the cavity in the inner cylinder so releasing the inner cylinder for axial movement. The tumblers of each pair mutually attract each other so that when the key is withdrawn they enter the grooves in the inner cylinder. The key and each tumbler can have separate magnets or be made of material which can be magnetized.