Patent GB-757559-A (GB)
Title: Actuating means for door fastenings
Inventor: JEAVONS PHILIP SWINGEWOOD
IPC: E05B65/26
Filed: 1954-05-05
Abstract: 757,559. Door fastenings. WILMOTBREEDEN, Ltd. April 22, 1955 [May 5, 1954], No. 13076/54. Class 44. Actuating means for a door fastening comprises in combination, a handle 13 adapted to be fixedly attached to a door, spring-loaded push button 16 occupying a recess 15 in the handle, a plunger 19 mounted coaxially with the push button and adapted by angular movement thereof to be engaged with or disengaged from the push button and means for effecting said angular movement on the plunger. In the construction shown the plunger is angularly moved from the outside of the door by a barrel lock 23 which is mounted in the push button and from the inside of the door by linkage (not shown) connected to an arm 33. A sleeve 24 extends from the barrel lock 23 and this is contained in a sleeve 17 which is formed on or secured to the end of the push button 16. The plunger 19 is contained within the sleeve 17, projections 32 on the plunger abutting against a flange 18 on the sleeve 17 to prevent withdrawal of the plunger from the sleeve. The sleeve 24 is provided with slots 28 which are of such width that the projections 32 can move up the slots and the slots are circumferentially recessed at their inner ends to provide shoulders 29 which prevent movement of the plunger relative to the sleeve 24 when these shoulders are in engagement with the projections 32. The base 20 of the recess 15 has a hole in which the plunger 19 can slide and this hole has a pair of diametrically opposite recesses 30. The plunger 19 has a pair of diametrically opposite longitudinal ribs 31, these ribs being enlarged at their upper ends to form the projections 32. The barrel lock is loaded by a spring 25 which tends to retain it in a central position but which permits angular movement in either direction and the push button is loaded by a spring 26. The arrangement is such that when the projections 32 are engaged with the shoulders 29, the ribs 31 are in alignment with the recesses 30 and thus when the push button is depressed the plunger moves through the base 20 to actuate the door fastening which is connected to the plunger 19. When the barrel lock is moved by its key the plunger is rotated so that when the barrel lock returns to its initial position under the influence of the spring 25 the projections 32 are aligned with the slots 28 in the sleeve 24 and the ribs 31 are out of alignment with the recesses 30 in the base 20. Thus the . plunger cannot move through the base 20 and movement of the push button is ineffective to actuate the door fastening since the projections 32 slide up the slots 28. The plunger can also be moved to this inoperative position by the arm 33 which is slidably but non-rotatably engaged with the plunger. The arm 33 can be connected to the door fastening so that if the door is closed with the actuatirig means in the looked position the door fastening imparts angular movement to the arm 33 and returns the plunger 19 to the unlocked position. If it is desired to provide means whereby the door can be locked from outside without the use of a key then the connection between the arm 33 and the door fastening incorporates a link having two parts slidable relative to one another against the action of an overload spring. With-this construction after setting the mechanism in the looked position by means of the arm 33 the door is closed with the push button depressed so that the plunger is prevented from angular movement by the interaction of the projection 32 with the slots 28; movement of the linkage in the connection between the door fastening and the arm 33 is then permitted by the overload spring. In a modification the barrel lock is omitted the slots 28 and shoulders 29 being formed in the sleeve 17. The sleeve 17 is surrounded by a sleeve having at its inner, end a flange serving the same purpose as the flange 18. In another construction the push button is formed with a post instead of a sleeve and the plunger is formed with a bore in which the post is slidable. In the inner end of the post is a transverse pin the ends of which form a pair of radial projections which engage longitudinal slots formed in the plunger, the slots being circumierentially recessed at their outer ends to provide shoulders. On the periphery of the plunger is a pair of diametrically opposite projections which engage longitudinal slots formed in a part of the handle in which the plunger is slidably mounted; these slots at their outer ends have ciroumferentially extending recesses providing shoulders. This construction operates in a similar manner to the previous construction, one set of projections. being aligned with their slots when the other set of projections are engaged with the shoulders and vice versa.-