Patent GB-1027630-A (GB)
Title: Improvements in and relating to locks
IPC: E05B47/06
Filed: 1962-10-24
Abstract: 1,027,630. Locks. E. A. ROSENGRENS A.B. Oct. 24, 1962 [Oct. 24, 1961; April 6, 1962], No. 40294/62. Heading E2A. [Also in Division H2] A lock Fig. 8 has two locking mechanisms for preventing the release of a bolt, one of which is key operated and the other is remotely controllable and comprises an electromagnet 14 having an armature 23 which is engageable with an abutment 27 to form a detent means. In the construction shown the bolt comprises a bolt lath 26 and two cylindrical portions 12a which form the bolt head and is mounted for sliding movement in a casing 28 and the electromagnet and its armature are both carried by the bolt. When the electromagnet is unenergised the armature is urged by a spring 24 into engagement with the abutment 27 which is fixed to the casing 28 and releasing movement of the bolt is thereby prevented. To move the bolt to releasing position the armature must first be moved to disengage the abutment by energisation of the electromagnet and then it can be moved to releasing position by a key inserted into the barrel of a barrel lock 30, rotation of the barrel moving the bolt through a follower in a known manner. As described the lock is used to lock the door of a safe deposit box, a plurality of such boxes being carried by a frame. The electromagnets are selectively energized by switches on a control panel under the supervision of an attendant and thus before the owner of any box can open it the attendant must first energise the electromagnet 14 of the particular box by actuating the appropriate switch on the control panel after which the owner can, by using his key, move the bolt to open the box. The electromagnet is energised through contacts carried by the bolt portions 12a which in the locking position of the bolt engage contacts 12b, in the wall of the box; these contacts 12b are wired to the control panel in such a manner that actuation of the switch not only energises the electromagnet 14 through contacts 11 to release the armature from the abutment 27 but also energises an electromagnet 10 which forms part of the switch, Fig. 12 so that the switch plunger is held in actuated position by an armature 10a until the bolt of the lock is moved to releasing position by the key; this disengages the contacts 12b from the contacts on the bolt and breaks the circuit so that both the electromagnet 14 and the electromagnet 10 are de-energised. The de-energisation of the electromagnet 10 allows the switch plunger to return to its original position under the urge of a spring. Moving the bolt to its releasing position causes contacts 13 in the box wall to mate and an indicator light 9 on the control panel is energised to indicate that the box is unlocked; the indicator light 9 is common to all the boxes. In the event of failure of the power supply to energise the electromagnet 14 the lock can be released mechanically and for this purpose a lever 34 is provided the end 35 of which protrudes from the casing into an aperture in the adjacent vertical wall of the box. Contained in the common vertical wall of a number of boxes is a sliding member having a recess for each box and when the sliding member is moved upwardly so that each recess is aligned with the end of the lever 34 of each such box for each the end 35 moves into the recess under the urge of a spring and the other end 36 of the lever engages the armature 23 and moves it out of engagement with the abotment 27 to enable the bolt to be moved to releasing position by the key. The lever 34 is mounted on the bolt itself so that it engages the armature 23 so long as the door is open. This provision enables the key owner to remove the key while the door is open and to re-insert it and relock the box. The switch shown in Fig. 12 can be modified by providing the plunger 19 with an extension having a point which marks a card when it is desired to have a record of the number of times the switch is operated. Another modified switch is shown in Fig. 21 in this construction the electromagnet comprises two tubes 40, 39 a coil 41 being contained in the tube 40 and surrounding the tube 39. A slidable shaft 46 is guided inside the tube 39 and biased upwardly by a spring 47 and an armature 42 is carried by the shaft adjacent a push button 45. When the push button is depressed the armature engages a resiliently mounted contact 43 and completes a circuit from a power supply via a terminal 50 through the coil, through the contact to the armature and through the armature via the tube 40 and panel 49 back to the power supply; when the coil is thus energised the armature is in contact with both tubes 39 and 40 and is held in this position as long as the coil is energised.