Patent GB-1406579-A (GB)
Title: Magnetically-operated lock
IPC: E05B47/00
Filed: 1973-11-07
Abstract: 1406579 Locks M R T MAGNET-REGEL-TECHNIK GmbH 7 Nov 1973 [8 Nov 1972 26 April 1973 10 Oct 1973] 51580/73 Heading E2A A magnetically operated lock comprises rotatably mounted magnetic stop members 4, 5 in a casing 1, the members being angularly movable by a magnetic key into a releasing position from a blocking position to which they are biassed and in which they prevent sliding movement of a locking member, a pin 3, which in a releasing position enters a recess 4a, 5a in the stop members to allow sliding movement of a bolt 2, the pin comprises a tapering end portion 3a which is engageable in a frusto conical opening 8 in the casing when the bolt is looked and in the releasing position, the pin 3 is depressed into the recesses 4a, 5a, by pressure of the surface of the opening on the end portion of the pin when the bolt is moved by means of the key. As shown in Fig I the bolt 2 is slidable in the casing 1 and has a recess for pivotally mounting the stop members 4, 5 and the spring urged locking pin 3 which projects into the opening 8 in the casing. Inserting a magnetic key in the channel 6 rotates the stop members so that the recesses 4a, 5a are adjacent and allow the locking pin to slide therein against the pressure of the spring 7 when the bolt is moved longitudinally to withdrawn position by the key. The key channel 14, Fig 2 may be formed in a separate slidable member 15  whereby when an incorrect key or tool is used the member 15 slides against the action of a spring 16 thereby relieving the mechanism of strain. The bolt may be retained by two similar locking pins releasable 'by two magnetic keys. As shown in Fig 5, there are two locking pins 28, 31, the pin 31 engages an opening in the casing and the pin 28 engages a frusto conical opening in an ancillary bolt 30 having limited sliding movement relatively to the bolt 27. The bolt 30 is lockable by an electromagnetically operated lever 36 by the end portion of which engaging in an opening 41 in the bolt 30. When the bolt is so locked it can only be released by using two magnetic keys in channels 33, 34. When the lever is released from the bolt 30 the bolt can be released by the key inserted in the channel 34. The electromagnet may be mounted within the lock casing and a plunger thereof engages an opening in the ancillary bolt within the casing. Fig 6 (not shown) releasing the bolt breaks contact which operate and signal indicating the bolt is released. One key may have a notch 71, Fig 7 (not shown) which engages the casing when the bolt is withdrawn to prevent removal of the key until the bolt has been refastened. The bolt may support a spring urged bolt 78 Fig 8 (not shown) which when released by a magnetic key in channel 74 allows repeated operation by a key in channel 75. As shown in Fig 9, the locking pin comprises two parts 108, 109 engageable in openings and two slidable members 111, 112. Insertion of the key in channel 106 and withdrawing the bolt 102 causes the parts to separate and the part 108 to engage in the recesses in four stop members. As shown in Fig 13, the casing 120 is cylindrical, and the rotatable inner cylinder 122 has two locking pins 127, 128, and a pair of stop members on each side of a central key channel 121. The pins engage in recesses in the casing and inserting a magnetic key, Figs 15, 16 in the, key channel and turning releases the bolt attached to the cylinder. The key has two circular magnetic bodies 134, 135 which are magnetised on opposite sides in zones 136 to 139 to correspond to the magnetic stop members. As shown in Fig 17 a bolt 224 is released from a locking pin 220 in a casing 202 by inserting a magnetic key in a key channel 208 to rotate stop members 214 to allow the pin 220 to disengage a recess in the bolt when the lock is moved bodily and the end portion 236 of the bolt rides over a fixed pin 238 against the pressure of a spring 227. The bolt is relocked by moving the lock in the opposite direction so that the end portion of the bolt again rides over the pin.