Patent GB-543173-A (GB)
Title: Improvements in and relating to latch mechanism for door and like closures
IPC: E05B65/32
Filed: 1941-02-17
Abstract: 543,173. Door latches, UNITED-CARR FASTENER CORPORATION. Feb. 17, 1941, No. 2116. Convention date, April 9, 1940. [Class 44] A latch mechanism for a motor car door, together with the outer handle 48 and barrel handle is operated, slides a pair of rods 65, 66 lock 53, is mounted on an L-form plate member with integral wings or flanges 17, 21, Fig. 35, to form a unitary structure which can be manipulated into position through a rectangular aperture in the outer panel of the door. One limb 19 of the plate member has lateral extensions provided with countersunk threaded apertures 27 and is adapted to lie against the, inner face of the hollow door edge where it is secured by screws entering the apertures 27. A swinging bolt 11 is pivoted between the flanges 21 on a pin 36 and is normally projected, by a spring 37 coiled round the pin, through an aperture 25 registering with a corresponding aperture in the door edge. The assembly is inserted in place by registering the limb 19 with a diagonal of the aperture in the door, its lateral extensions being passed through the aperture in succession, the bolt is withdrawn by handle 48 to allow the limit to be brought to position in which the bolt can shoot and a cover-plate 22 carried by the other limb of the plate member covers the aperture in the door. The securing screws are then inserted. The bolt has pivoted thereon at 43 one end of a link the other end 40 of which is of hook form and 'is normally held by a spiring 33 in the path of the inner arcuate end 49 of outside lever handle 48 which is pivoted between flanges 17 on a vertical pin 51, a spring 52 normally holding handle 48 against the door. The bolt is thus retracted by swinging handle 48 outwards. The plug-of lock 53, rotatable by key 57 carries an eccentric cam plate 58 which, when swung to the left, Fig. 2, engages a hump 42 on the link to swing its end 40 clear of the path of handle portion 49, so that the outer handle is rendered inoperative. The inside handle 67 is independently mounted on the inner panel of the door and has an arm 62 which when the handle is operated, slides a pair of rods 65, 66 horizontally in opposite directions. When the handle is depressed rod 65 moves to the right, its L-shaped end 68a bearing against a tailpiece extension 32 of the bolt, to rock the bolt clockwise and retract it. When the handle is raised from normal position rod 66 is moved to the right, its outer end engaging and rocking a locking lever 73 mounted on the bolt pivot 36. The lower bevelled end of the lever exerts a cam action on the inner end 87 of the link, rocking it clockwise to render the outside handle inoperative, the pointed end of the lever engaging in an aperture in the Jink end 87 to hold the parts in this position. Release of the locking lever is effected when the bolt is retracted by the inside handle. Alternatively, the inner handle only retracts the bolt and a separate pivoted lever is provided to control lever 73. The projected bolt engages behind projection 30 on a keeper, Fig. 33, which also has a pivoted safety catch 96 held projected by a spring 97.