Patent GB-772902-A (GB)
Title: Door fastenings
Inventor: MANSFIELD JAMES BARRY
IPC: E05B65/08
Filed: 1955-07-13
Abstract: 772,902. Door latches. WILMOT-BREE. DEN, Ltd. Nov. 14, 1955 [July 13, 1955], No. 20255/55. Class 44. A door fastening for a horizontally slidable door comprises in combination, a body part adapted to be mounted on the door adjacent a vertical edge, a spring loaded latch element 6 pivotally mounted on the body part for angular movement about an axis extending transversely relative to the door and adapted to engage a keeper or the like on a fixed part of the door surround or on a complementary door where double sliding doors are provided, a release arm 9 pivotally mounted on the body part and co-operating with the latch element in such a manner that angular movement of the arm in either direction will impart a releasing move. ment to the latch element, a lever 16 pivotally mounted on the body part for actuation about a vertical axis from opposite sides of the door, a vertical spindle 11 connecting the lever with the release arm and means for moving the spindle axially to disconnect the lever from the release arm. The release arm 9 is of U-shape and its limbs embrace a bracket 8 forming a portion of the body part and which is secured to a mounting plate 5 also forming part of the body part. The limbs of the release arm extend through slots 5a in the mounting plate 5 and embrace the latch element 6 adjacent its pivot. The latch element is provided with two projections 6b, 6c, each of which is engaged by a respective limb of the release arm so that movement of the release arm in either direction will release the latch element from its keeper against the loading of a spring 7. One limb of the release arm is connected to the bracket 8 by means of a pivot-pin 10 while the other limb of the release arm is connected to the bracket by the lower end of the spindle 11. The spindle 11 has a key 12 which normally engages a keyway formed in the associated limb of the release arm 9 so that angular movement of the spindle moves the release arm. The upper end of the spindle 11 is connected with the lever 16 by means of a key 13 which engages a keyway in a bush 14 which is fixed to the lever 16 and which pivotally supports the lever 16 on a U-shaped bracket 15 attached to the mounting-plate 5. The lever 16 is connected by means of handles 17 to a further pivotally-mounted lever 18 and the ends of the levers 16 and 18 on the outside of the door project through a cover-plate 21 in which is mounted rubber or other resilient fillets 22 in which the arms of the levers are located, the arrangement being such that angular movement of the levers in either direction compresses the resilient fillets which tend to return the levers to a mid-way position. The means for moving the spindle 11 axially is a key-operated barrel lock 23 which raises the spindle through a link 24. When the spindle 11 is raised the key 12 is removed from its key-way in the arm 9 so that movement of the levers 16 and 18 is ineffective to move the release arm. In a modification a manually operable locking handle may be provided at the inner side of the door instead of or in addition to the barrel lock. The latch element 6 may be connected to one or more similar latch elements. The lever 18 and the handles 17 can be omitted if desired in which case the lever 16 is provided with T-shaped handles at each end.