Patent GB-872566-A (GB)
Title: Door fastenings
Inventor: CHANARYN VICTOR
IPC: E05B65/32
Filed: 1957-04-16
Abstract: 872,566. Door fastenings. WILMOTBREEDEN Ltd. March 17, 1958 [April 16, 1957], No. 12368/57. Class 44. In a door fastening of the kind having a catch 14 which is engageable with a notched striker 18 when the door is closed, the catch has the form of a torsionally resilient rod provided at one end with a cranked portion 14c through the medium of which the rod is torsionally stressed by the striker during closing movement of the door and which is engageable with the striker for retaining the door in its closed position. The catch is of hairpin-like shape and it is secured to a body part of the fastening which comprises a pair of oppositely directed U-shaped strip metal brackets 11 and 12. One limb 14a of the catch extends through slots formed in the legs 11a and 11b of the bracket 11 and through a slot in a plate 10 to which the brackets are attached so as to be movable in a vertically upwards direction as shown; the other limb 14b extends through a slot or a separate hole in the leg 11b and through a slot or hole in an extension 11 d of the bracket 11 so as to be prevented from vertical movement while being free to move angularly about its axis. The cranked portion 14c is formed on the end of the limb 14a and the limb 14b has a similar cranked portion. At the inner side of the leg 11 a of the bracket 11 is a vertically movable catch restraining member 15 having a hole through which the limb 14a passes. The upper end of the member 15 extends through a slot formed in a sheet metal shank portion 16a of a transversely movable push-button 16 loaded by a spring 17 and normally the shank portion 16a engages a notch in the vertical edge of the member 15 and prevents upward movement of the member 15 and the limb 14a. When the pushbutton is depressed however, the shank 16a is removed from the notch and the member 15 and limb 14a are free to move upwardly. When the door is in the open position the cranked portion 14c occupies the position shown in chain dotted lines in Fig. 1 and during closing movement of the door the portion 14c rides over the outer end of the striker 18 torsionally stressing the catch 14 during the process and engages one or other of two notches in the striker to hold the door closed. When the door is to be opened the push-button is depressed and this frees the member 15 for vertical movement and the limb 14a moves vertically in the slot in the bracket 11 and so can ride over the striker teeth during the opening of the door. When the door is fully opened the resilience of the catch pulls the member 15 downwardly so that the pushbutton can re-engage the notch. In a modification a pivoted catch restraining member is provided instead of the slidable member 15 and the push-button is provided with an abutment which prevents movement of the pivoted restraining member. When the push-button is depressed the abutment is moved to allow the catch restraining member to pivot. In this construction a spring-loaded handle is also provided for opening the door from the inside. This handle is arranged to impart angular movement to the push-button to move the abutment away from the catch restraining member and so allow it to pivot. In a modification pivoted handles are provided on both sides of the door. In both of these latter constructions a movable stop may be provided to block angular movement of the catch restraining member.