GB624822A - Improvements in or relating to locks - Google Patents

Abstract

624,822. Striking plates. PARKER, F. L. July 10, 1947, No. 18297. [Class 44] The key operated bolt of a lock is adapted to cooperate with a U-shaped member which is normally secured in a fixed position in a door jamb, an operating knot being associated with the U-shaped member to release it for rotation so that the door may be opened or closed without retracting the bolt. The U-shaped member 3, Fig. 3, is mounted in an opening 2, Fig. 2, in the door jamb and is rotatably carried on a rod 7 the upper portion of which is of rack form to co-operate with a toothed wheel on the spindle 11 of the knob 12. A rib 4 on the underside of the member 3 fits in a slot in a fixed plate 6 securing the member against rotation. The member is released for rotation by the disengagement of the rib 4 from the slot when it is lifted against a spring 13 by rotation of the knob 12 and the lock bolt held between the limbs of the member is then 'freed by pressure on the door. A catch plate 18 pivoted over the opening 2 may be lowered to engage the notches 19, Fig. 3, in the limbs of the U-shaped member 3 to prevent its rotation. If the door is locked with the catch plate in the operative position it can only be opened by retraction of the bolt. A lower extension 22 of the plate 6 is formed with an aperture 23 for the latch bolt.