GB1484301A - Two stage lock - Google Patents

Abstract

1484301 Locks NORRIS INDUSTRIES INC 7 Aug 1974 [7 June 1974] 34859/74 Heading E2A A lock 14 for a hinged door panel 11 includes a base plate 42 and a cover plate 43 accommodating pivoted copolymer latch elements 40, 41 therebetween which are biased towards each other by a spring 54 and which are cooperable at their free ends with a striker pin 30-35 secured to a bracket 17 on the door frame, the latch elements including confronting cut-outs 62, 63 accommodating a slidable lock element 61 having fingers 66, 67 engageable in pockets 64, 65 at the ends of the cut-outs to preclude separation of the latch elements. In the embodiment shown in Figs. 3 and 4, the lock' element 61 is actuable by a plate 70, 71 which at one end is secured by a tab 77 to a control button and which at the other end is engageable by a tail 78 on a plug 79 rotatable by a lock cylinder. The lower latching element 41 has a shoulder 90 which prevents the lock element from engaging in the pockets 64, 65 when the striker pin is not in position between the latch elements. The latch elements 40, 41 also have confronting tapered cut-outs 108, 109 accommodating a spindle 102 which is rotatable from inside or outside the door to disengage the latch elements from the striker pin. In the Fig. 10 embodiment, the striker pin is lengthened to accommodate a latch bush 117 on a screen panel 115. In each case, the striker pin has axially-spaced annular grooves 32, 33 engageable by the latch elements 40, 41 in partially-and fully-closed positions of the door panel respectively.