| 摘要 |
<p>1506127 Locks GEORGIA PACIFIC CORP 7 April 1976 [9 July 1975] 14118/76 Heading E2A A door 10 is secured to a frame 12 by a latch 50 having a head bearing two shoulders 76 and 86 which, in positions "A" and "C" respectively engage edges of the opening in the frame member 12 to prevent the latch being withdrawn from the keeper. In the intermediate position "B", obtained by inserting the correct key 92 through aperture 16 and pushing it in as far as possible, so moving latch 50 against its bias, the shoulders 76 and 86 are exactly aligned with the opening and the latch may be withdrawn and the door 10 opened, usually by sliding. The latch 50 preferably comprises two legs 54, each bearing shoulders 76, 86 and upstanding lugs 58 which engage the sides of depression 14 surrounding key-apertures 16 and define key-paths 60 leading to the tapering projections 54, designed to deflect picklocks &c. The correct degree of deflection of latch 50 to give position "B" is assured by contact between the surface 18 and surface 106 between key-legs 106 acting as a stop (Fig. 4). As shown in Fig. 3 the opening in frame member 12 is roughly T-shaped. In position "A" surfaces 84 of shoulders 76 hook over edge 40 of the opening; in position "C" surfaces 92 of projections 86 engage behind the sides of narrowed portion 38.</p> |
