Patent GB-885378-A (GB)
Title: Improvements in or relating to fastening devices for doors
IPC: E05C1/14
Filed: 1959-11-23
Abstract: 885,378. Latches; key-operated locks. WEBSTER, D. E. C. Nov. 23, 1959, No. 39722/59. Class 44.  A fastening -device for a door 5, Fig. 1, arranged to fit within a cylindrical recess formed in the edge of the door and a transverse intersecting circular hole and consisting of a cylindrical bolt casing 4 fittable in said recess and guidingly housing a retractable bolt 1 of which the end 2, Fig. 7, within the casing provides perpendicularprojection means 3 having converging faces which slidably engage corresponding converging faces 16 provided by a V-shaped recess in an actuating slide 13, Fig. 5, adapted to be operatively disposed in the said hole and slidably and guidingly projecting through said casing to displace the bolt axially when the slide is moved axially for the bolt to be retracted by a wedging action applied to the projection means by one of the oblique faces of the slide is characterized in that the bolt is lockable in its extended and retracted positions by a rod 105, Fig. 6, located longitudinally in the slide and capable of oscillating rotation through a limited extent about its axis from one alternative position to another, the rod 105 providing a longitudinal region 107 adapted to be extended across the V-shaped recess and across a side of the projection means of the bolt slidably associated with the converging faces of the slide for immovably retaining said projection means in the apex formed by said converging faces to prevent retraction of the bolt or in a spaced position relative to said apex to retain the bolt in the retracted position, the oscillatory movement of the rod from one alternative position to the other for locking and freeing the bolt being applied thereto by means associated on both ends of the slide and which, in addition to effecting the rotation of the rod, also forms the means on which pressure is applied for bodily moving the slide along its path for retraction of the bolt. The rod actuating means comprise a push-button 24 at the end 112 of the slide 13 and a rotary barrel key-operated locking device at the slide end 19. With the said locking device lock-which is of the disc tumbler type-an additional diametrically positioned tumbler 120, Fig. 4, is provided which is not operated by the key but which forms the coupling for the element 105 and in addition is adapted to permit rotation of the lock barrel  40, after insertion of the key, only in that direction required by the rod 105 to be moved to the other alternative position from the alternative position in which it happens to be. In operation, to unlatch the door, axially directed pressure is applied to either the button 24 or the barrel 40 to axially displace the slide 13 for the faces 16 to effect a wedging and displacing action on the projections 3 of the bolt 1. Due to this wedging action, the faces 16a of projections 3 are arranged to slide along faces 16 to cause bolt retraction. For locking the bolt in the extended position, the rod 105 is rotated either by the button or the barrel. Element rotation is through 90 degrees only. An alternative form of element is described in the Specification with reference to Figs. 8 and 9 (not shown). Key-operated locking devices or push-buttons may be coupled to both ends of the actuating slide. Alternatively, the fastening device may be operable from one side of the door only a push-button or key-operated device being provided for this purpose.