GB1210831A - Improvements relating to door lock and latch assemblies - Google Patents

Abstract

1,210,831. Locks. K. MATSUNAGA. 29 Dec., 1967 [29 Dec., 1966; 23 Feb., 1967], No. 59207/67. Heading E2A. A door lock and latch assembly comprises a manual knob 7 (or handle) provided with a hollow cylindrical extension 8 adapted to operate, by rotation thereof, a latch bolt 3, a cylinder lock mechanism 36 adapted to receive a key to allow operation of a dead bolt 2 by rotation of the key, said mechanism comprising a hollow cylindrical sheath 37 housing the rotatable elements of the mechanism ,and wherein said sheath is disposed coaxially within said cylindrical extension and is secured to a housing 1 of the assembly, whereby rotation of knob or handle and said extension is isolated by said sheath from rotation of said rotatable elements. In the construction shown the hollow cylindrical extension 8 is rotatably supported by a rose 9, the rose having a plurality of angularly spaced hollow cylindrical. projections 10 which extend from its rear surface and which are engaged by set screws 12 which pass through holes in a mounting plate 11 to secure the mounting plate 11 and the rose on opposite sides of the door. The extension 8 is prevented from axial movement relative to the rose 9 by a circlip 19, end portions of which engage in slots in the extension 8. The housing 1 has an end wall and a peripheral wall and in the peripheral wall are a plurality of notches 15 in which lugs 13, extending from the mounting plate 11, fit to connect the housing to the mounting plate 11. A screw bolt 18 extends through the housing and the mounting plate 11 to engage one of the projections 10 and thus prevents release of the housing from the lugs 13. A mounting plate 23 is secured to the base of the housing 1 by set screws 22 which extend into hollow cylndrical projections 21 connected to the base of the housing and the mounting plate 23 has a pair of arcuate slots through which projections 8' of the extension 8 extend to engage a latch bolt driving arm 25 which is pivotally supported by the mounting plate 23. The arm 25 has a slot 26 and a notch 26' to receive the projections 8' of the extension 8 and it also has an ear 26" which engages a lateral projection 3' of the latch bolt 3 thus suitable rotation of the knob 7 used in this embodiment will turn the arm 25 counterclockwise as shown in Fig. 2 to cause the ear 26" to engage the projection 3' to withdraw the latch bolt 3 against the bias of a spring 29. The arm 25 is biassed to the inoperate position by a spring 27. If the knob 7 is turned in the opposite direction a projection 25" of the arm 25 engages a shaft 30 of a latch bolt operating member 28 which has an ear 28' engageable with a second lateral projection 3" of the latch bolt and causes the member 28 to withdraw the latch bolt. Coaxial with the member 28 and rigidly connected to the shaft of an interior handle 6, which is pivotally mounted by the housing 1, is a second latch bolt operating member 33 which engages in a slot in the latch bolt so that rotation of the lever handle 6 is thus able to retract the latch bolt. The lever handle 6 and the second latch bolt operating member 33 are biassed by a spring 32' to their inoperative positions. The cylinder of the cylinder lock mechanism is connected via a spring biassed dog clutch 43, 46 to a thumb turn 4 pivotally carried by the housing 1, the full insertion of the key 5 engaging the two parts of the dog clutch so that the cylinder is connected to the thumb turn; the shank portion of the thumb turn has a plate 50 rigidly secured to it and the plate has an arm 50' which is received within an elongated groove formed in the upper surface of a thinner rear portion 2' of the dead bolt 2 and thus rotation of the thumb turn 4 moves the dead bolt between locking and unlocking positions. If the rotation of the dead bolt is carried out by hand from the rear of the door the lock mechanism is not rotated because of the dog clutch being disengaged, but if the key is used rotation of the cylinder rotates the thumb turn because the dog clutch is then engaged. In a modification the cylinder lock mechanism instead of being secured to the mounting plate 23 as shown in Fig. 3 is secured to the mounting plate 11. In this construction both mounting plates have an arcuate slot through which the projections 8' of the extension 8 extend. In another modification the housing 1 is wholly contained within a recess in the door and there are two knobs, one on each side of the door and two roses; the mounting plate corresponding to plate 11 has a central circular projection to which the lock mechanism is secured and the other mounting plate is omitted. The housing is bolted to the mounting plate and the two roses have plates which are connected together by bolts extending from the inner rose plate to cylindrical extensions of the outer rose plate the cylindrical extensions passing through the housing; the rose on the inside of the door has a screw threaded bore and another part of the rose has a thread which is engageable with a thread of the bore to secure the knob assembly to the rose.