GB475304A - Improvements in locks - Google Patents

Abstract

475,304. Locks and latches. ASH, J., ROGERS, A., and ROGERS, A. L. Oct. 24, 1936, No. 28938. [Class 44] A lock having a latch bolt which may be retracted by finger operated means passing through the door and which may be locked or retracted by a key is constructed with the key and finger operating means projecting from the casing in close proximity sc as to be able to be housed in a tubular casing or pass througl a single hole in the door. The latch bolt 1 may be withdrawn by the push button 5 acting through the levers 6 and 4, and also by a key acting on the nib 19 and lever 11. When the key is turned in the reverse direction to that required for withdrawing the latch it co-operates with the notch 14 to slide the bolt 12 to a position where it blocks the tail of latch. The member 15 coacting with pin 16 holds the bolt 12 shot. This operation allows the nib 19 on member 11 to be withdrawn from the path of the key. To retract the latch from this position the key has to be turned twice in a clockwise direction, once to lower the bolt 12, and bring nib 19 into the path of the key and then again to retract the latch. The plunger 5 and the key are adapted to be housed in a cylindrical casing 23 with the sheet metal member 25 forming a guide trough 26 for the plunger and a key guide 27. A modification, Fig. 7, shows the latch bolt 30, which may be retracted by finger operated means, locked in a shot position by the nib 33 of a slide bolt 32 which is held against the side of a slot 31 in lever 29 by a guard lever 35. Rotation of the key in an anticlockwise direction causes the nib 33 to move to the other side of projection 37 and release the bolt; a further rotation of the key causes the nib 33 to co-operate with the side of slot 31 and withdraw the latch. Specification 446,110 is referred to.