Patent GB-167680-A (GB)
Title: Improvements in door-locks
IPC: E05B55/00
Filed: 1920-08-03
Abstract: 167,680. H³ttemann, W. Aug. 3, 1920. Latches, sliding; night-latches; locking sliding latches.-The inner and outer handle of a lock are relatively rotatable, and the outer handle can be arrested by a reversal of the inner handle,. leaving the bolt free to engage automatically when the door is slammed. The bolt may also be actuated by a key mechanism. The bolt 1 is operated by a slide 2 which in turn is actuated by a bell-crank lever B turned by a follower 35 rigidly connected to the outer handle H. Rigidly connected to the inner handle and surrounding the shaft of the outer handle is a casing 3, having a slot through which the follower 35 projects, the follower being engaged by one end of the slot for operating the bolt by the inner handle. The casing 3 also carries an arm 4, which, when the inner handle is turned backwards, engages a notch 9 in the bolt to block it in the locked position, rendering the outer handle immovable. The slide 2 has a lug 5 which can be blocked by the arm 4, arresting the outer handle, but leaving the bolt free to engage when the door is slammed. When the outer handle is thus arrested, the bolt 1 may be operated from the outside by a key lock 32. The inner handle may be retained in its various positions relative to the outer arm by a bevelled pin 10, operated by a push-button 57 taking intoslots 63 in a plate 12 secured to the inner handle.. When the button 57 is depressed, a spring 56 turns the inner handle until the pin snaps into the next aperture 63. Other means for holding the handles in their relative positions may be used, such as a pin 59, Fig. 9, in a sliding ring 58 on the shaft taking into a zig-zag slot 60, or a spring pin 67, Fig. 12, taking into one of a series of slots in the lock spindle. In the modification, shown in Figs. 12 and 16, the outer handle shaft 40 is fitted on the square part of the lock-spindle, the casing 3 being coupled to the shaft of the inner handle by pins 42. The outer handle-shaft has a lug 41 which is engaged by the edge 45 of the casing 3 for operating the bolt. A catch 43 is arranged to engage the lug 41 to arrest the outer handle and can be released by the lug 44. Latches, pivoted.-For a pivoted latch, the slide 2 has an inclined edge engaging with an inclined shoulder on the bolt to lift it about its pivot. The outer handle is arrested by a catch pivoted to the lock casing and snapping over an additional arm on the outer handle shaft and released by an additional arm on the inner-handle casing 3. Electrically-controlled fastenings.-The catch 43 pivoted to the casing arresting the outer handle may be released by a solenoid, which may ring a bell to indicate that the lock may be opened by the outer handle. Locks, revolving-barrel.-The key lock 32 may be of the revolving barrel type, the arm 3 either engaging the shoulder K on the latch to withdraw it, or being turned down into engagement with the lug 29 on the latch to block it. To lock the barrel in its two positions, the casing has two sets of pin tumblers 30, 31 operated by the same key. The barrel may be partially surrounded by a casing, as the inner handle casing 3, the edge of which may turn the arm to block or release the latch.