Patent GB-837857-A (GB)
Title: Actuating means for a door fastening mechanism
Inventor: SMITH CYRIL GEOFFREY
IPC: E05C1/16
Filed: 1957-09-24
Abstract: 837,857. Door fastenings. YALE & TOWNE MANUFACTURING CO. Sept. 5, 1958 [Sept. 24, 1957; May 13, 1958], Nos. 29922/57 and 15267/58. Class 44. Actuating means for a door fastening mechanism comprises the combination of a body part 10, Fig. 1, attached to a side of a door 12, an angularly movable handle 14 mounted on the body part 10, a spring- loaded press-button 17 in the handle, clutch means consisting of flats 17a and 14d on the button and handle respectively, whereby angular movement of the handle will be imparted to the button when the latter is in its outermost position, a spring- loaded catch 22 for retaining the button in a depressed position, Fig. 2, in which said clutch means is disengaged, key-operable means for releasing said catch, and means for imparting angular movement of the press-button to a part of the door fastening mechanism. The body part 10 is formed with a flange 10a through holes in which pass screws 11, Fig. 6, whereby the body part is attached to the door side, the screws 11 passing through the door 12 to retain in position the body part of a similar actuating means, or a fixed handle, at the opposite side of the door and the inner side of the handle 14 fits into an annular groove in the flange 10a and conceals the screws 11, the handle being retained on the body part by spring-loaded locking pieces 15, Fig. 3, mounted slidably in the body part 10 to engage an internal groove 14a in the handle and holes 14b being provided in the handle through which wires may be inserted for depressing the locking pieces 15 to permit the handle to be removed. The inner end of the press-button 17 is accommodated within a skirt 10c provided on the body part 10 and has slidably mounted therein the catch 22, a key-operated plug 23 being rotatably mounted in the press-button and provided with an eccentric peg 24 which engages a slot in the catch 22 for disengaging the latter. The press-button 17 is biased by a circumferential spring 21 to a normal central position when a latch bolt 27 of the door fastening mechanism is projected and to prevent inadvertent depression of the press-button the catch 22 engages a shallow circumferential groove 10e in the skirt 10c when the press-button is in its outermost position. When the press-but. ton 17 is depressed it engages notches or holes 10d connected to the groove 10e by axially extending slots 10f and disposed at given angles at opposite sides of the catch piece when the press-button is in the normal position, so that the latter has to be rotated before it can be depressed and a central extension of the press-button occupies a position between the locking pieces 15 so preventing removal of the handle for the purpose of withdrawing the press-button. The latch bolt 27 is slidably mounted within a cylindrical housing 25 inserted in a hole in the door edge and the bolt is spring-biased to a projected position for engagement with a keeper. Connected to the inner end of the bolt 27 is a lath 28 in which is formed a slot 28a so shaped that a short spindle 29 of square cross-section which passes through the slot is non-rotatable in the slot when at one end thereof but can be rotated in the slot at the other end thereof, so that two abutment members 30 secured at opposite ends of the spindle 29 and normally extending transversely of the lath 28 are not limited in length since they can pass through the hole in the door edge while extending lengthwise of the lath 28. Each abutment member 30 is engaged by a follower 20 rotatably mounted in an extension 10g on the respective body part 10 and a non-circular pin 19 connected to the press button 17 engages a corresponding non-circular hole in the associated follower 20 for rotation thereof. The follower is retained in the extension 10g by a washer 32 and to ensure accurate location of the body part 10 relaytive to the housing 25 the extension 10g is formed with a pair of dove-tail projections 10h one of which engages in a complementary slot 25a formed in the housing. The actuating means may be fitted on doors of either hand in view of the provision of the notches or holes 10d and the pair of dove-tail projections 10h. The follower 20 is spring-loaded in an inward direction so that it will always be in facial contact with the lath 28 irrespective of what thickness the door is. Two small pips 15a are provided at the outer ends of the locking pieces 15 which engage the holes 14b to retain the handle 14 in a given position when it is disengaged from the press-button 17.