US2831337A

US2831337A - Lock mechanism

Info

Publication number: US2831337A
Application number: US530581A
Authority: US
Inventors: Backhouse Headley Townsend
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-08-25
Filing date: 1955-08-25
Publication date: 1958-04-22
Anticipated expiration: 1975-04-22

Description

April 1958 H. 'r. BACKHOUSE 2,831,337

LOCK MECHANISM Filed Aug. 25, 1955 5 Sheets-Sheet l April 22, 1958 H. T. BAcKHousi-E LOCK MECHANISM 1 3 Sheets-Sheet 2 Filed Aug. 25, 1955 April 22, 1958 H. T. BACKHOUSE 2,831,337

LOCK MECHANISM Filed Aug. 25, 1955 3 Sheets-Sheet 5 Unite States Patent LOCK MECHANISM Headley Townsend Backhonse, Nassau, Bfiamas, British West Indies Application August 25, 1955, Serial No. 530,581

6 Claims. (Cl. 70-150) This invention relates to locks for doors or other closure members of the kind having a bolt which normally extends from a casing (e. g. for engagement in a socket, keeper or the like on a frame for the closure member or on a post or equivalent) but may be withdrawn inwardly of the casing to a release position, a keyoperated lock of the rotatable, barrel type accessible at one side of the casing for operation and means operable by the barrel lock by which the bolt may be locked in the extended position. Such locks will be hereinafter referred to as door locks of the kind described and are commonly constructed as mortice locks, although the invention is not restricted to mortice locks but includes, for example, rim locks.

The invention provides a door lock of the kind described which is characterised by the feature that the barrel-lock-operated means comprise an abutment member which is movable by operation of the barrel lock to and from a bolt-holding position in which it lies in the path of withdrawal of the bolt thereby to hold the bolt in the extended position, by the provision of lostmotion between the barrel lock and the abutment member permitting movement of the member to the boltholding position independently of the barrel lock when the barrel lock is in its unlocked position and by handleoperated means accessible at the opposite side of the casing by which the member may be moved to and from the bolt-holding position without operation of the barrel lock when the latter is in its unlocked position.

In one form of the invention the abutment member is in the form of an arm which is rotatable in one direction from a neutral position to the bolt-holding position and, in the other direction from the neutral position, to withdraw the bolt to the release position. The arrangement may be that the barrel lock may, in addition to effecting movement of the arm to the boltholding position as aforesaid, also be operative to rotate the arm to withdraw the bolt to the release position. The handle-operated means may also be arranged to be operable to rotate the arm to withdraw the bolt to the release position.

In another form of the invention the abutment member is a slide guided for movement in the casing in a direction transverse to the direction of movement of the bolt and there is a cam which is rotatable by the barrel lock and by the handle operated means to move the slide in at least one direction. The cam, in this form of the invention, may operate on the abutment member through a lever. The lock may include means for withdrawing the bolt to the release position operable by an additional handle at one or each side of the lock casing.

In order to hold and to locate the barrel lock there may be provided in each of the above forms of the invention, a block of angular shape for reception within a corner of the casing the block having a hole within which the barrel of the key lock is received and the wall at one side of the hole being split and there is a ire Preferably the block is also attached to a wall of the casing for example, by one or more screws.

Two specific constructions of mortice door locks according to the invention will now be described by way of example of how the invention may be carried into effect and with reference to the accompanying drawings in which:

Figure 1 is an elevation of one of the locks with the cover plate of the lock casing removed;

Figure 2 is a view similar to Figure 1 but showing the lock with the barrel lock and holding block removed;

Figure 3 is a section on the line 3--3 in Figure 1;

Figure 4 is a section on the line 44 in Figure 2;

Figure 5 is a view of the front of the lock with a cover plate omitted;

Figure 6 is an elevation of the other of the looks with the cover plate of the lock casing removed;

Figure 7 is a view similar to Figure 6 but showing the key-lock and holding block removed;

Figure 8 is a section on the line 88 in view 6;

Figure 9 is a section on the line 9-9 in Figure 6; and

Figure 10 is a section on the line 1010 in Figure 6.

The lock shown in Figures l-S comprises a rectangular casing 12 which includes a detachable cover plate 1.3.v Slidable within the casing there is a latch-b0lt14 having a chamfered bolt head 15 which normally protrudes from the casing for engagement with a socket or keeper on the door frame. urges the latch bolt outwardly of the casing.

Pivotally supported within the casing there is a lever arm or pawl 20, the pivotal support consisting of a boss 21 on the lever received within a hole in the wall 22 of the casing. The boss 21 has a square socket 24 for engagement by a square operating spindle attached to an operating handle. The free end 25 of the arm is arranged, in one position of the arm as shown in full lines in Figure 2, to engage an abutment 26 on the latchbolt 14 so that rotation of the arm in the clockwise direction as viewed in Figure 2 will withdraw the latch- 4 bolt head 15 inwardly of the casing. When the lever arm is rotated anti-clockwise to the chain line position I shown in Figure 2, the free end of the arm is positioned in the path of an abutment surface 28 on the latch-bolt and the arm then serves as a strut preventing inward movement of the bolt. Projecting from the arm. there is a pin 3!) for a purpose later described. A latch 31 is pivoted at 32 to the casing and operable by a finger piece 33 projecting from the front of the casing to engage behind a tongue 34 on the latch-bolt, as shown in dotted lines in Figure l, to hold the bolt in the Withdrawn position.

Located in the bottom 'rear corner of the casing thereis a square block 36 which is held to the cover 13 by screws. The block has a hole 37 within which is received the end 38 of the barrel of a key operated lock 39. The 7 block 36 is divided at 40 and .a stepped screw 41 passes through the side of the block on one side of the division and engages a screw thread 42 in the block on the other side of the division. The head of the screw is accessible cylinder 46 of the lock carries at the inner end'aplate 47 which is operable to engage the pin 30 and by rotation of the cylinder to'rockthe lever arm 20 between the two positions shown in Figure 2. The plate 47 has abut A spring around a bolt 16 ment faces 47a, 47b for engagement with the pin 30, the faces being spaced about 180 apart whereby there is nearly 180 of lost motion between the barrel lock and the arm 20. This lost motion has three functions. Firstly and assuming the barrel lock is in the position as shown, it permits the arm to be moved clockwise (as viewed in Figure 2) by means of the operating handle and square spindle and thereby to withdraw the latch-bolt to the release position, without interference with the barrel lock. Secondly it permits the arm 20 to be turned anticlockwise by the handle into the bolt-holding locking position shown in chain lines, again without interference with the barrel lock. Thirdly it enables the barrel lock, after anti-clockwise rotation to move the arm 20 to the boltholding locking position, to be returned freely to the position shown, at which the key may be inserted and withdrawn.

In the second example shown in Figures 6-l0 there is a rectangular lock casing 50 and a latch-bolt 51 which is slidable in the casing in the direction to withdraw the latch-bolt head 52 inwardly of the casing. There are two operating lever arms 54-55 which are independently rotatable by square spindles operating in

sockets

56, 57 and rotatable by handles on the two sides of the door respectively. The lever arms engage a tongue 58 on the latch-bolt and each arm may operate independently of the other arm to withdraw the bolt. A stop pin 60 is provided to prevent one or both of the lever arms being moved in the clockwise direction from the position shown in Figure 6, the stop pin being insertable into either side of the casing.

Located within the casing there is a square block 62 which is of similar construction to the block described in the previous example and is arranged to hold a barrel lock 63. The barrel lock is clamped and the block is held by a screw 64 as in the previous example. The cylinder of the barrel lock is arranged to rotate an operating arm 65. This arm is arranged to engage two pins 67 and 68 on the side of a cam disc 69. The disc has the form of a major segment of a circle and is rotatable about the centre of the circle by the arm when in engagement with one or other of the pins 67, 68. The pins 67, 68 are spaced about 180 apart so the arm 65 has substantial lost motion between the pins.

Pivotally supported from the casing at 70 and above the disc 69 there is a lever 72 having a dependent projection 72a which engages the periphery of the disc 69. The free end of the lever engages in a transverse slot 73 in a slide 74 which is guided for vertical movement within the casing on a rail 76 secured to the side wali of the casing. The cam disc 69 may also be rotated by means of a handle 77 on the opposite side of the lock casing to the barrel lock 63. A stop pin 78 limits the rotation of the cam disc 69 by engagement with the fiat face thereof.

In use the latch-bolt may normally be withdrawn by anti-clockwise movement of either of the

lever arms

54, 55 by means of its appropriate operating handle. When it is required to lock the latch-bolt, the cylinder of the barrel lock is rotated to efiect rotation of the cam disc 69 from the position shown in Figure 6 to that shown in Figure 7. This causes the lever arm 72 to rise and so to raise the slide 74 to the position shown in Figure 7 in which it lies in th path of an abutment surface 79 on the latch-bolt and so acts as a positive stop preventing withdrawal of the latch-bolt. In view of the lost-motion between the arm 65 and the two pins 67 and 68 the arm may be returned to the upright position at which the key of the lock may 'be withdrawn, without operation of the cam disc, so that the latch-bolt remains locked. When the arm is in the upright position (as shown in Figure 6) the handle 77 may be employed to rotate the cam 69 to raise and lower the slide.

I claim:

1. A door lock comprising a generally rectangular, shallow, lock casing, a slide having a bolt head at one end thereof and guided in the casing for sliding movement of the head inwardly and outwardly of a side wall of the easing, a block of angular shape received and secured within one corner of the casing, said block having a cylindrical hole perpendicular to the faces of the casing and being split at one side, screw clamping means for closing the split and thereby to contract the hole, a key-operated barrel lock having a cylindrical casing fitting within said hole and held therein by contraction thereof as aforesaid, movable stop means for dead-locking the bolt slide and an operative connection between said barrel lock and said stop means whereby said barrel lock may be operated to move the stop means into and out of its dead locking position.

2. A door lock as claimed in claim 1 in which the screw means are accessible for operation from the front side wall of the casing and the edge of the door when the casing is in position.

3. A latch lock for a door or like closure member comprising a lock casing, a latch bolt having a chamfered head and guided in the casing for sliding movement of the head inwardly and outwardly of the casing, said bolt also having an abutment surface facing in the direction of inward movement, spring means urging the bolt head outwardly of the casing, a stop member and means for guiding the stop member within the casing for sliding movement transverse to the movement of the bolt between a position in which it lies in the path of said abutment surface and so acts to dead lock the bolt and a position in which it is clear of the bolt and leaves the bolt free forinward and outward latching movement, a handle at one side of the casing, a connection between the handle and the stop member for moving the member between the two positions aforesaid comprising a cam rotatable by the handle and operative to effect movement of the slide, a key operated lock of the type having a rotatable barrel and a single key-insertion and removal position, said key operated lock being accessible for operation at the opposite side of the casing and an operative connection between said rotatable barrel and said stop member for moving the stop member between the two positions aforesaid comprising a connection between the lock barrel and the cam having suiiicient lost-motion to enable the barrel to be turned without movement of the stop member to the key insertion and removal position after movement of the stop member to either of its two positions aforesaid.

4. A latch lock for a door or like closure member comprising a lock casing, a latch bolt having a chamfered head and guided in the casing for sliding movement of the head inwardly and outwardly of the casing, said bolt also having an abutment surface facing in the direction of inward movement, spring means urging the bolt head outwardly of the casing, a stop member and means for guiding the stop member Within the casing for sliding movement transverse to the movement of the bolt between a position in which it lies in the path of said abutment surface and so acts to dead lock the bolt and a position in which it is clear of the bolt and leaves the bolt free for inward and outward latching movement, a handie at one side of the casing, a connection between the handle and the stop member for moving the member etween the two positions aforesaid comprising a cam rotatable by the handle and operative to effect movement of the slide, a key operated lock of the type having a rotatable barrel and a single key-insertion and remo ai position, said key operated lock being accessibis for operation at the opposite side of the casing and an operative connection between said rotatable barrel and said stop member for moving the stop member between the two positions aforesaid comprising a connection between the lock barrel and the cam consisting of an arm on the barrel which engages, with lost motion, between abutments on the cam, the lost motion being sufficient to enable the barrel to be turned without movement of the stop member to the key insertion and removal position after movement of the stop member to either of the two positions aforesaid.

5. A latch lock for a door or like closure member comprising a lock casing, a latch bolt having a chamfered head and guided in the casing for sliding movement of the head inwardly and outwardly of the casing, said bolt also having an abutment surface facing in the direction of inward movement, spring means urging the bolt head outwardly of the casing, a stop member and means for guiding the stop member within the casing for sliding movement transverse to the movement of the bolt between a position in which it lies in the path of said abutment surface and so acts to dead lock the bolt and a position in which it is clear of the bolt and leaves the bolt free for inward and outward latching movement, a handle at one side of the casing, a connection between the handle and the stop member for moving the member between the two positions aforesaid comprising a lever with pivoted connection to the casing and the slide and a cam operative through the lever to eifect movement of the slide, a key operated lock of the type having a rotatable barrel and a single key-insertion and removal position, said key operated lock being accessible for operation at the opposite side of the casing and an operative connection between said rotatable barrel and said stop member for moving the stop member between the two positions aforesaid comprising a connection between the lock barrel and the cam having sufficient lost motion to enable the barrel to be turned without movement of the stop member to the key insertion and removal position after movement of the stop member to either of its two portions aforesaid.

6. A latch lock for a door or like closure member comprising a lock casing, a latch bolt having a chamfered head and guided in the casing for sliding movement of the head inwardly and outwardly of the casing, said bolt also having an abutment surface facing in the direction of inward movement, spring means urging the bolt head outwardly of the casing, a stop member and means for Cit guiding the stop member within the casing for sliding movement transverse to the movement of the bolt between a position in which it lies in the path of said abutment surface and so acts to dead lock the bolt and a position in which it is clear of the bolt and leaves the bolt free for inward andoutward latching movement, a handle at one side of the casing, a connection between the handle and the stop member for moving the member between the two positions aforesaid comprising a cam rotatable by the handle and operative to effect movement of the slide, a key operated lock of the type having a rotatable barrel and a single key-insertion and removal position, said key operated lock being accessible for operation at the opposite side of the casing, an operative connection between said rotatable barrel and said stop member for moving the stop member between the two positions aforesaid comprising a connection between the lock barrel and the cam having sufi'icient lost-motion to enable the barrel to be turned without movement of the stop member to the key insertion and removal position after movement of the stop member to either of its two positions aforesaid and means for holding and locating the barrel lock comprising a block of angular shape received within a corner of the casing the block having a hole within which the barrel of the key lock is received and the wall at one side of the hole being split, and a clamping screw by which the split may be closed to cause the block to grip the barrel, which screw is accessible for operation from the front of the casing and the edge of the door when the lock is in position.

References Cited in the file of this patent UNITED STATES PATENTS