Patent GB-692394-A (GB)
Title: Improvements in or relating to door locks
IPC: E05B65/32
Filed: 1951-06-15
Abstract: 692,394. Door latches. HOUDAILIE-HERSHEY CORPORATION. June 15, 1951 [Aug. 12, 1950], No. 14211/51. Class 44 A door latch e.g. for a motor vehicle comprises a plate 10 for fixing to the joint edge of a door and a right angle plate 15 extending parallel to the inner panel of the door. Pivotally and slidably mounted on the plate 10 is a latch 11, Fig. 1, carrying at one end a pin or bolt 30 which projects for co-operation with a keeper 17 attached to the door joint. The other end of the latch is formed with a slot 35 in which engages a pin 36 carried by a dogging lever 12, Fig. 2, mounted on the inside of the plate 10 by a pin 39. The other arm 41 of the lever 12 engages an abutment face 42 on a spring-loaded controlling lever 13 pivoted at 44 and having one arm 45 flanged and adapted for operation e.g. by an outside push button and a curved extension 55 of the other arm adapted for engagement by a lever 50, Fig. 3, pivoted on the plate 15 and actuated by inside operating means through a link. The pivot pin 32 of the latch is guided in a horizontal slot 31 and connected to a spring 33 arranged to turn the latch in a clockwise direction (as seen in Fig. 1) and to move the pivot pin to the left-hand end of the slot 31. The keeper has a flat upper edge 19 preceded by a ramp 18 for cooperation with a pin 21 fixed to the door and supporting it against sagging. The under-edge of the keeper provides a horizontal part 23, a vertical shoulder 24 and a sloping take-up edge 25 in which is formed a safety-notch 27. With the control mechanism in the normal or latched position as in Fig. 2, the pin 36 is held at the lower end of the arcuate slot 37 through which it projects into the slot 35 in the latch. When the door is open the latch is urged by the spring 33 to the position of Fig. 1. As the door shuts the bolt 30 abuts the shoulder 24 of the keeper and the latch is moved to the position of Fig. 5 where the bolt can pass over the shoulder 24 and slide up the edge 25 to the fully latched position of Fig. 1. If the door is not fully shut the bolt will engage in the safety notch 27. To open the door the lever 13 is rotated by inside or outside means to free the dogging lever 12. The door may then be pulled open, the latch swinging about its pivot 32 at the left hand end of the slot 31. Mere release of the dogging lever only allows the door to open as far as the safety notch as shown in Fig. 6. For complete release of the door, the lever 13 must be turned further so that the arm 45 abuts the end of the lever 13 and moves the pin 26 to the upper end of the slot 37 so that the bolt 30 passes below the shoulder of the keeper. The latch may be locked against operation by the outside push button or the like by a quadrant 57, Fig. 3, pivoted to the plate 15 and having a surface 61 adapted to be positioned under the arm 55 of the lever 13. The quadrant is controlled by an outside key-lock or an inside button acting through a link 60. A finger 62 co-operates with a finger 64 of the lever 50 to move the locking quadrant to the unlocking position on actuation of the inside operating means.