Patent GB-859214-A (GB)
Title: Improvements in or relating to locks
IPC: E05B63/12
Filed: 1957-05-03
Abstract: 859,214. Push and pull fastenings; sliding bolts. INTERMETALL GENERALVERTRETUNGEN UND GROSSHANDELSGESELLSCHAFT. May 3, 1957 [May 15, 1956], No. 14203/57. Class 44. A lock for fixture to a door or the like comprises a housing 2, a locking member 16 movable inside the housing to lock and unlock the lock, a first actuating member disposed on one side, a second actuating member disposed on the other side and which when the lock is unlocked, is movable to uncouple itself from the locking member so as to be blocked against recoupling to the locking member when the locking member is actuated by the first actuating member to lock the lock. In the form shown, one end of the housing carries a pair of balls 8 in apertures in opposite edges, the balls being urged outwardly by a spring 10 to engage recesses in opposite projections of a keeper 13. When the balls 8 are not engaged by the locking member 16 they can move inwardly against the pressure of the spring 10 to disengage the recesses so that the door or like can be opened, but when the end of the locking member 16 is positioned between them they cannot so move and the door or like is fastened. The first actuating member is on the outside of the door or like and consists of a knob 17 which causes stops 20 or 22 to engage counterstops 19 or 21 of the locking member. The second actuating member is a slide 23. The movement of the stops 20, 22 is controlled by a combination lock mechanism as disclosed in Specification 859,216. The slide 23 is mounted on the housing 2 by means of a pin 25 connected to the slide. The pin 25 has a portion 26 which slides in a guide 24 of the housing, a split locking ring 28 preventing the slide being removed. The guide 24 has a portion 241 of arcuate shape and this is continued by an elongated portion 24"; the pin portion 26 is of part circular crosssection with a flat 29 and when it is on the guide portion 24<11>, it cannot be rotated. The member 16 has an aperture 30 which also has a portion 301 of arcuate shape continued by an elongated portion 30<11> and a portion 31 of the pin 25 co-operates with the aperture 30. The portion 31 is of essentially semi-circular crosssectional shape with a flat 32. The slide has a window 33 and the housing has three differently coloured marks 341, 34<11>, 34<111> to indicate the position of slide. The normal position of the slide is with the pin portion 31 engaging the lower part of the arcuate portion 30<1> of the member 16 and hence when the slide is moved the member 16 moves with it. When the balls 8 are engaging keeper projections 11, the door or like is locked from the inside by moving the slide to the right until the mark 341 appears in the window 33; the end of the member 16 then prevents the balls moving inwardly. To unlock the door or like the slide is moved to the left until the mark 3411 appears in the window 33. When the mark 341 appears in the window 33 the member 16 cannot be moved to unlocking position from the outside of the door or like by the combination lock mechanism since the member 16 is too far to the right to enable the counterstop 21 of the member 16 to be engaged by the stop 20 of the combination lock mechanism. If the slide is moved until half of each of the marks 341 and 34<11> appear in the window 33 then the member 16 can be moved to unlocking position either by moving the slide 23 or by turning the knob 17 since the stops controlled by the knob 17 can then move the member 16. To prevent the member 16 being moved to the unlocking position from the inside of the door or like the slide 23 is first pushed to the left to the position in which the mark 34<11> appears in the window 33 and the door or like is opened. The slide is then rotated through 180 degrees until the mark 34<111> appears in the window 33. This rotation is possible since the pin portion 26 is in the arcuate portion 241 of the guide 24; in any other position of the slide the flat 29, by engaging one edge of the elongated portion of the guide 24, prevents rotation of the slide. This rotation of the slide moves the pin portion 31 from the lower part of the arcuate portion 30<1> of the member 16 to the upper part. The door or like is then closed and the member 16 is moved to its locking position by turning the knob 17. The movement of the member 16 causes the pin portion 31 to move into the elongated portion 3011 of the aperture 30 in the member 16. The door or like cannot then be opened from the inside since sliding movement of the slide is prevented by the pin portion 26 being in the arcuate portion 241 of the guide 24 and rotation of the slide is prevented, partly by the pin portion 31 being in the aperture portion 30<11> of the member 16 and partly by engagement of the outside edges of the slide with the projections 11 of the keeper. The member 16 is retained in its various positions by a spring loaded ball 37 engaging recesses 351, 3511, 35<111> in the member 16. In a modification the balls 8 are omitted and the locking member engages a recessed keeper.