GB2202267A

GB2202267A - Multi-point lock

Info

Publication number: GB2202267A
Application number: GB8802829A
Authority: GB
Inventors: Donald Malcolm Fullard
Original assignee: FULLEX Ltd
Current assignee: FULLEX Ltd
Priority date: 1987-02-12
Filing date: 1988-02-08
Publication date: 1988-09-21
Anticipated expiration: 2008-02-08
Also published as: GB2202267B; DE3860795D1; EP0278704A3; GB8802829D0; GB8703249D0; EP0278704A2; EP0278704B1

Abstract

A multi-point lock construction that can reduce the amount of preparation of an edge member of a closure or opening necessary for it to be fitted with the lock comprises a control unit (1) and a remote bolt (3,4) that can be fitted mortice fashion into a solid or hollow edge member, and a bar (2) which fits parallel to the face of the edge member operably connects the drive member (10) to the remote bolt (3,4). The remote bolt is caused to be thrown by the interengagement of a follower movable with the bar (2) and an inclined slot (74) at the bolt. The control unit may operate more than one remote bolt through one or more bars. A spring-loaded latch bolt (25) and a dead bolt (26) may be included and linked so that retraction of the dead bolt (26) causes retraction of the latch bolt (25). A catch (62) prevents the remote bolts (3,4) from being unintensionally shot.

Description

1 2202267 1 MULTI-POINT LOCK This invention relates to-a multi-point lock

for a closure such as a door or window whereby the closure is held in a closed position in an opening by means of a plurality of bolts operating at spaced locations between an edge member of the closure and an adjacent edge member at the periphery of the opening, the location of at least one of the bolts being remote from control means, su ch as a handle, by which operation of the bolt is effected.

Commonly such multi-point locks include a latch bolt which also operates between the edge member and adjacent member. The latch bolt has an associated operating handle and the remote. bolt is normally arranged to be operated by that handle as well. There may be two, or possibly more, of the remote bolts which are interconnected for simultaneous operation.

Known multi-lock constructions have generally required an appreciable amount of preparation work to be done on the member to which the lock is to-be fitted for use in order to, enable it to accept the lock. This adds to the cost and time involved in fitting the lock, even when the lock is fitted as original equipment to the member, and it can make it difficult to apply the lock to an existing member. For-example, in the case of a door which includes hollow, such- as extruded aluminium, members in its construction and is fitted with a multi-point lock at one of its hollow stile members, it has been common for the lock to be assembled, at least partially, in the stile member before the member is connected to the other components of the door where the lock is provided as original equipment, or after the stile member has been 2 disconnected from the rest of the door when the lock is required to.be fitted to an existing door. It has been, impossible to apply some known multi-point lock constructions to solid stile members.

According to the present invention a multi-point lock is provided which comprises a control unit adapted to be mounted in a hollow in an edge member of a closure or opening and having a f ore-end by which it can be fixed at or adjacent to a face of the edge member, operating means embodied in the control unit including a linearly reciprocatory drive member adjacent to the fore-end which moves parallel to the fore-end and has fast with it at the fore-end a bar is which extends longitudinally from the drive member in the direction of the linear movement of the drive member, -and which is operatively coupled to a remote bolt spaced from the control unit to cause the bolt to be shot and retracted transversely of the bar by the linear movement of the drive member.

As the bar is at the fore-end of the control unit it is possible for it to extend along the -face of the edge member to which the lock is. fitted for use, or in a groove in the face or it may extend just behind the face. In a. preferred form the bar is made of flat strip material and is arranged so that its broader faces are parallel to the fore-end of the control unit. Thus it may lie flat against or closely parallel to the face.

The -control unit is preferably adapted to be received into a mortice in the edge member opening to the face at or adjacent to which the bar is disposed. The remo te bolt may be similarly adapted. It is po ssible, therefore, for the lock to be fitted to an 1 j 1 ' f- 14 3 edge member from the face at which the lock is to be operative. This enables it to be f itted to a solid edge member, as for example of a wooden door. The bar may lie on the f ace of the edge member, where in the preferred strip form it will be relatively inobtrusive, or it may be accommodated in -a. groove in the face. Providing mortices and surface grooves in edge members does not normally present undue difficulty, even in respect of existing doors and frames, and so it will be realised that an embodiment of the lock according to the present invention is possible which may be fitted to an edge member with relative ease.

The lock may also be installed in a hollow edge member. The control unit and remote bolt may be located in mortice fashion in the edge member, and the bar may be disposed at the inside or outside of a face wall of the hollow member.

Preferably the movement of the bar is translated into the transverse movement of the remote bolt by means of a follower co-operating with aninclined cam surface. A follower, -conveniently in the form of a roller, associated,with the bar may engage with a slot associated with the remote bolt inclined relative to the directions of movement of both the bolt and the bar. The cam action can be arranged to give an advantage in the translation of the movement so that the throw of the bolt can be greater than the distance moved by the bar.

There may be more than one remote bolt. The control- unit may be intermediate the locations of the remote bolts, or the remote bolts may be at locations which are to one side of the control unit. The bar may be operatively coupled to each of the remote bolts, or 4 there may be individual bars for the remote bolts connected to the drive member.

The operating means may comprise a handle or key. A toothed element. rotatable by the handle or key may mesh with a rack f ormed on, or carried by, the drive member to move the drive member.

A spring-loaded latch bolt may be embodied in the control unit. A handle for retracting the latch bolt aga inst the spring- loading may also operate the drive member. The latch bolt may have a head which has a flat face and a chambered face and which can be rotated into alternative positions to suit either hand of operation.

In addition to, or instead of, a spring-loaded latch bolt, the control unit may include a dead bolt. Such a bolt may be restrained from being shot when the or each remote bolt is retracted. There may be co-operation between the dead bolt and the bar, or one of -the bars, which provides the necessary restraint. For example the bar, or one of the bars, may have a slot in it -through which the dead bolt projects when it is shot, and when the bar is moved to the position in which the, or its associated, remote bolt is retracted that slot may be moved out of register with the dead bolt so that it cannot be shot, or a portion of the slot may co-operate with a mating part of the bolt to prevent - the bolt. from being shot. Where there is a latch bolt there may be a linkage which causes that bolt to be retracted as the dead bolt is retracted.

The multi-point lock now provided has particular application to- hinged closutes. In such an application it is intended - that the lock will operate between the S.

1 free edge member of the closure and the edge member at the periphery of the opening against which the free edge member closes. Normally the lock will be on the closure but it may be fitted to the peripheral edge member of the opening. - Preferably the or each remote bolt has a chamfered nose which co-operates with an associated striker of a keeper to cause the closure to be urged against the edge member of the opening, thereby to help to provide a weather seal at the closure, where appropriate, and reduce draughts around the closure.

It would be possible for the lock to be used with a sliding closure, for example a patio door, to operate is between overlapping surfaces of edge members.

t Preferably a catch is provided which operates to prevent the drive member from being 'actuated unintentionally to cause the remote bolt or bolts to be shot. The catch may be in the form of a plunger which engages with a slot in the bar, or one of the bars, and prevents the bar, and hence the drive member, from being moved to the bolt-shooting position.

1 It is possible for the remote bolts to be operated by a night latchadtion.

An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings, in which:

Figure 1 is - a f ront perspective view of a multi-point lock according to the present invention, and 1 6 Figures 2 and -3 are side views 'respectively of a control -unit and a remote bolt unit of the lock, both with cover-plates removed.

In this embodiment of the invention the multi-point lock is intended to be fitted to the stile member at the free edge of a hinged door.

is The-multi-point lock comprises a control unit 1, a single long bar --2 of relatively thin, typically 1.6 mm thick, -flat metal strip connected centrally to the control unit, and two remote bolt units 3,4 near the opposite ends of the bar. The lock can be f itted to the edge f ace of the stile member of the door. Where the stile member. is, for example, a solid timber member,' mortices can be cut into the member from the edge f, -.).ce to accept the control unit 1 and remote bolt units 3,4. - The bar 2 may lie f lat against the edge face or it may be accommodated in a shallow groove formed-in the edge face.

The control unit 1 has a rectangular, slab-like housing 5 made up_ of a hollowed-out metal block 6 and a cover plate, hot shpwn. One longer side of the housing 5 constitutes a fore-end 7 of the control unit. At the fore-end the block 6 has. longitudinally projecting flanges 8, and it has a shallow channel 9 which extends all along its length -and continues across the flanges. The channel 9 is of complementary width and depth to the bar 2 which extends flat along the channel. Within the hollow of the block at the fore-end 7 is a reciprocatory drive member 10, Figure -2, which moves linearly longitudinally of the Channel 9. A front portion 11 of the drive member 10 projects through an oblong opening 12 in the foreend to the channel, and a - central rectangular boss 13 on the front portion 11 1 h 1 1 7 i 10 engages in a complementary hole in the bar 2. Screws 14 inserted through plain holes in the bar 2 at either.side of the boss 13 and tightened into threaded holes in the drive member 10 fix the bar securely to the drive member. The oblong opening 12 is longer than the drive member so as to allow the latter to move in the housing lengthwise of the channel. As shown in Figure 2, a rear portion of the drive member is formed as a toothed rack 15 which extends lengthwise of the channel and is divided longitudinally by a groove 16 which locates and guides a sliding element 17. In mesh respectively with the two halves of the rack 15 are twin toothed sectors 18 which are rotatably located on co-axial central hubs 19 of associated twin winged cams 20 mounted on, for turning with, a spindle 21, or respective spindles, rotatable by handles, not shown, at opposite sides of the control unit. The winged cams 20 are axially outside the sectors 18. Their hubs 19 have bearings respectively in the block and the cover of the housing. Each winged cam 20 has two opposed wings 22 one or the other of which, depending upon the direction of turning of the cam, - engages with extensions, not shown, of two of the teeth of the associated sector 1,8 to cause the sector to rotate with the cam for part of its range of turning with the spindle 21, and so drive the rack to move the drive member 10, and hence the bar 2, linearly. Mounted on, to turn with, the spindle 21 between the sectors is a follower 23 which has trunnions, not shown, to provide support for the sectors. A finger 24 of the follower 23 is able to engage with one end of the sliding element 17 to slide it along the groove 16 in the drive - member,' when the spindle is turned in the clockwise direction as viewed in Figure 2.

8 Also in the housing, located in the hollow of the block 6 and by the cover, are a spring-loaded latch bolt 25 and a dead bolt 26.

- A post 27 which is fixed in the block and engaged with the cover projects through longitudinal slots 28 in a lath 29 of the latch bolt 25 to help to guide the bolt- in its movement and also provides an abutment for a helical compression spring 30 in a bore 31 of the lath. which normally urges the latch bolt to a projected position. A peg 32 on a transverse tail portion 33 of the lath engages in a slot 34 in the block and further assists in guiding the latch bolt in its movement.. In the projected position a head - 35 of the latch bolt projects through an opening 36 in the channel 9 and protrudes from the fore-end 7 of the control unit through an extended slot 37 in the bat 2. The head 35. has a straight flank 38 and a chamfered flank 39 and it is rotatable on the lath 29 to enable the- presentation of the flanks to be changed to suit the hinging of the door with which the lock is used. The slot 37 in the bar extends along the bar further than the head 35 and has a reduced portion371 at one end, the - purpose., of ' which will be made clear hereafter. Asnib 40 rotatably mounted in the block is operable by a handle 41,_ which can be located at either side of the control unit, as appropriate for use, to engage a detent 42 with the tail portion 33 of the lath for holding the latch bolt in a retracted position against the action of the spring 30.

- A two-lobed rocker 43 pivoted in the block and to the cover adjacent to the latch bolt 25 has a first lobe 44 engageable with the tail portion 33 of the lath 29 and its second lobe 45 engageable with the end of the sliding member 17 _ opposite that with which the 1 3 v F 9 finger 24 of the follower 23 co-operates. Turning the spindle 21 to cause the sliding member to be moved along the drive member 10 by the f inger 24 turns the rocker 43 so that its first lobe 44 bears on the tail portion 33 and -retracts the latch bolt against the spring loading. When the latch bolt is subsequently allowed to be Projected again by the spring 30 the tail portion pivots the rocker 43 in the opposite direction, and its second lobe 45 pushes the sliding member back along the drive member to its initial position.

The dead bolt is located in the block 6 at the opposite sIde of the spindle 21 from the latch bolt 25. Its nose 46 projects through a complementary opening 47 in the channel 9 and a slot 48 in the bar which in the main is of complementary shape to the bolt. but has a narrower extension portion 481 at one end which is complementary to a niched part 49 of the bolt just behind the nose 46. In one position of the bar relative to the control unit the narrower extension port-ion 481 of the slot 48 can be engaged with the niched part 49 of the bolt when the bolt is in its retracted position. When so engaged the bar prevents the deadbolt from being shot. A peg 50 on a side face of the bolt is engaged in a guide groove 51 in the block to assist in guiding the bolt in its travel. The dead bolt is operated by a key- operated locking cylinder 52 of known kind which is accessible from either side of the control unit. A radial lug 53 on a rotary element of the locking cylinder enters a notch 54 in an edge of the dead bolt to shoot and to retract the bolt. Within the notch 54 the lug 53 co-operates with a retainer 55 which is located in a hollow in the block alongside one side face of the bolt, is spring-urged towards the notch and has a U- shaped recess 56 in it with which a peg 57 on the bolt engages. When the bolt is in either one of its retracted and shot positions, and the retainer is in its normal spring urged position, the peg 57 engages in a respective one of the two parallel limbs of the recess 56 and the- bolt is thereby positively retained in that position. When the lug 53 is engaged---in the notch 54 by operation of the locking cylinder 52 to move the bolt, it lifts the retainer against the spring loading sufficiently for the web part of the U-shaped rec ess 56 to be brought into register with the peg 57 to free the bolt for movement.

S lidably located in guide-ways 58,59 in the dead-bolt and the drive member 10 are two co-operating p,USh rods 60f61 respectively which extend between the lockinq cylinder and the- rocker 43. Upon operating the locking cylinder to retract the dead bolt the lug 53 engaged with the adjacent push rod 60 and moves it transversely of the dead bolt. That push rod in turn moves the other push rod 61 along the drive member into driving engagement with the second lobe 45 of the rocker 43 to turn the rocker and cause the latch bolt to be retracted-as the dead bolt. is retracted. When the latch bolt returns to its projected position again the opposi te pivoting of the rocker restores the push rods 60,61 to their initial positions.

Also in the control unit 1 at the fore-end 7 is a catch 62 in the form of a spring-loaded plunger located in a bore 63 in the block 6 opening into the channel 9. The catch 62 has a stepped diameter operative end section of which a smaller diameter outer part 64 is of a diameter complementary to the width of the reduced portion 37' of the slot 37 in the bar 2, and a larger diameter inner part 65 is 'of a diameter complement ary to the width of the main portion of the slot 37. When j r 1 1 11 the latch bolt and the inner part 65 are both engaged in the main portion of the slot 37 the bar cannot be moved along the channel 9 because they co-operate with opposite ends of that portion. If the catch 62 is depressed against its spring loading to move the inner part 65 behind the bar the smaller diameter outer part 64 is brought into register with the reduced portion 37' of the slot and the bar can then be moved.

The two remote bolt units 3,4 will now -be described with, particular reference to Figure 3. They are similar to one another. Each has a generally T-shaped housing 66 of similar thickness and depth from f ront to back to the housing 5 of the control unit 1.

The housing 66 comprises a hollowed metal block 67 and a cover plate, not shown.- The cross part of the T-shape of the housing 66 constitutes a fore-end 68 of the respective remote bolt unit. At the fore-end the block 67 has flanges 69 projecting longitudinally from the cross part. The flanges 69 are formed with aligned channels 70 of complementary width and depth to the bar 2, hich extends along the length of the fore-end 68 and the flanges 69. Slidably located in the block 67 is a bolt 71, a nose 72 of which has symmetrically convergent chamfered flanks 73. An inclined slot 74 is formed in the bolt 71. Engaged in the inclined slot 74 is a roller 75 supported between two rearwardly extending arms 76 of a carrier 77 which is fixed by screws 78 to the bar. The carrier 77 is accommodated in the housing 66 in a hollow 79 in the block 67 at the fore-end 68 which allows the carrier to move. with the bar relative to the housing. The bolt 71 passes through an elongated opening 80 in the carrier and projects through a slot 81 in the bar which i s longer lengthwise of the bar than the bolt. When the bar is moved longitudinally the cam action of the roller 75 1 12 and inclined slot 74 causes the bolt 71 to slide in the housing 66 transversely of the bar between retracted and shot positions.

Typically each inclined slot 74 is inclined at 35' to the lo ngitudinal axis of the remote bolt 74 and is of a length to- allow approximately 22 mm travel for 15-mm. of movement of the bar. The angle and length of the slot may, of course, be varied according to the travel desired, and similarly the extent of the movement of the-bar may be varied.

There are f ixing screw holes 82 and 83 respectively in the flanges 8 of the control unit housing 5 and the flanges 69 of the housings 66 of the remote bolt units 3,4. Access slots 84 in the bar opposite those screw holes enable screws to be inserted into the holes and tightened past the bar by a screw driver.

To assemble the multi-point lock on the edge face of-a door stile member, as previously mentioned, it can be offered to the member from the edge face. The housings 5 and 66 Are entered into respective mortices in the member. Recesses are preferably provided at the mouths of the mortices to receive the flanges 8,69. The housings are secured, and thereby the entire lock, by fixing screws applied at the flanges 8,69 and driven into the member. Apart from the mortices, recesses and the shallow groove previously mentioned for the bar, if required, the only other requirements of the member for it to accept the lock are holes into the control unit mortice from the opposite faces of the door for the handle spindle 21, or spindles, and for the cylinder lock. There may be a handle at only one side of the door, if desired.

p j 1 f 13 The head 35 of - the latch bolt 25 is set on the lath for the straight and chamfered flanks 38,39 to be appropriate for the hand of the hinging of the door. Keepers are mounted on the adjacent edge members of the door opening for the latch bolt, dead bolt and remote bolts, those for- the latch bolt and remote bolts having strikers. There is also a striker for the catch 62.

Use of the lock with a solid stile member has been mentioned earlier herein. The lock may also be used with a hollow edge member. Again, with such a member the lock may be of f ered to it f rom an outside - face to be assembled on the member. It may alternatively be offered to the inside of the member, for example from is one end in the case of an extruded member. For such an arrangement the wall of the member presenting the face from which the various bolts are to be shot is f ormed with the necessary -openings for the bolts to project 25- through, and the housings 5 and 66 can be secured by their flanges behind that wall by screws inserted through the wall and access slots 84 in the bar and tightened into the screw holes 82,83 in the flanges, which for this arrangement would be screw-threaded.

As -illustrated in the accompanying drawings, the flanges 8 of the housing 5 of the control unit and the flanges. 69 of the housings 66 of the remote bolt units 3,4 by which the housings are fixed in position for use are at the fore-ends of the housings. For some installations of the multi-point lock it may be desirable for the flanges to be set back from the fore-ends. The extent by which they are set back may v - ary according to installation requirements. When the housings are made as castings, which will normally be the most convenient manner of manufacture, the dies may 14 be made adjustable to vary the positions at which the flanges are formed as required.

It will be- understood from the foregoing description-that the remote bolts 11 are simultaneously operated. The chamfered noses of the remote bolts enable co-operation with their respective strikers which helps to urge- the stile member closely against the edge member of the door opening. The long throws of the bolts which can be achieved by means of the inclined slots 74 ensures their secure retention in their keepers. When the bar is in its bolt retracting position and the door is open the catch 62 has its inner part 65 engaging in the main portion of the slot 37 in the bar to prevent the bar from being moved from that position. To release the bar the element has to be depressed to move its outer part 64 into register with thereduced portion 371 of the slot. As the door is closed whilst the bar is in the bolt retracting position the element 62 is depressed by its striker so that the bar is freed to be moved to its bolt shooting position. The dead bolt 26 can only be shot when the remote bolts have been shot.- In the bolt' retracting position of the ban the narrower extension portion 271 of-its slot 27 associated with the dead bolt is engaged with the niched part 49 of the bolt to prevent the bolt from being shot.

1

Claims

1. A multi-point lock which comprises a control unit adapted to be mounted in a hollow in an edge member of a closure or opening and having a f ore-end by which it can be fixed at or adjacent to a face of the edge member, operating means embodied in the control unit including a linearly reciprocatory drive member adjacent to the fore-end which moves parallel with the fore-end and has- fast with it at the fore-end a bar, which extends longitudinally from the drive member in the direction of the linear movement of the drive member, and which is operatively coupled to a remote bolt spaced from the control unit, causing the bolt to be shot and retracted transversely of the bar by the linear movement of the drive member.

2. A multi-point lock according to claim 1 wherein the bar at the foreend of the control unit is made of flat strip material and is arranged so that its broader faces are parallel to the fore-end of the control unit.

3. A multi-point lock according to claim 1 or claim 2 wherein there ismore than one remote bolt operatively coupled to the bar.

4. A' multi-point lock according to claim 1 or claim 2 wherein there is more than one bar connected to the drive member and more than one remote bolt, each bar extending longitudinally in the direction of linear movement of the drive member and having at least one of the remote bolts operatively coupled to it to be caused to be shot and retracted, transversely of the bar by the linear movement of the drive member.

1 16

5. A multi-point lock according to claim 3 or claim 4 wherein the remote bolts are located to one side of the control unit.

6. - A multi-point lock according to claim 3 or claim 4 wherein the remote bolts are located on opposite tides of the control unit.

7. A multi-point lock according to any preceding claim wherein the or each bar is operatively coupled to the or each respective remote bolt by means of a follower co-operating with an inclined surface.

8. A multi-point lock according to claim 7 wherein the follower is -a roller associated with the bar and and the inclined surface is provided by a side edge of a slot associated with the remote bolt inclined relative to the directions of movement of both the bolt and the bar.

9. A multi-point lock according to claim 8 wherein the inclination of the slot is such that the throw of the remote bolt resulting from the cooperation of the roller with the inclined surface is greater than the distance moved by the bar in its operating linear movement.

10. A multi-point lock according to any preceding cl-aim wherein the drive member has a linearly movable rack and the operating means further comprises a handle or key And-a toothed element rotatable by the handle or key and in mesh with the tack such that rotation of the toothed element by the handle or key moves the rack, and thereby the drive member, linearly.

1 c 1 17 4

11. A multi-point lock according to any preceding claim wherein the control unit embodies a spring-loaded latch bolt normally urged by the spring-loading to a projected operative position.

12. A multi-point lock according to claim 11 wherein an interconnection is provided between the drive member and the latch bolt whereby as the drive member is moved to cause the or each bar to retract the remote bolt or respective remote bolts, the latch bolt is' retracted, the spring-loading subsequently returning the latch bolt to theprojected position.

13. A multi-point lock according to claim 10 and claim 12 wherein the toothed element has an associated follower element which is rotatable with the toothed element when that element is rotated in the direction which causes the drive member to be moved in the direction for the or each bar to retract the remote bolt or bolts, and there is a pivoted rocker which co-operates with the latch bolt and which is caused to be pivoted to retract the latch bolt when the:follower element is rotated as aforesaid.

-

14. A multi-point lock according to claim 13 wherein the drive member carries a sliding element which is slidable relative thereto in the direction of linear movement of the drive member and which translates rotation of the follower element as aforesaid into pivoting of the pivoted rocker to retract the latch bolt, said rotation of the follower element being coupled with the movement of the drive member in the remote bolt retracting direction, and the sliding element being slid relative to the drive member back to an initial position by return pivoting of the rocker 18 when the latch bolt is subsequently returned to the projected position by the spring loading.

15. A multi-point lock according to claim 13 or claim 14 wherein the follower element and a cam are mounted on and rotatable with a rotary spindle, the toothed element is mounted for rotation relative to the spindle, about the rotational axis of the spindle, in either direction of rotation of the spindle, and the cam has parts which provide alternat-ive means of engagement between the cam and the toothed element according to the direction of rotation of the spindle for the- cam and toothed element to turn together' for part of the range of rotation of the cam with the spindle.

16. A multi-point lock according to any of claims 11 to 15 wherein the latch bolt has a head having a f lat face- and a chamfered face and which can be rotated into alternative positions to suit either hand of use.

17. A multi-point lock according to any preceding claim wherein the control unit embodies a dead bolt.

18. A multi-point lock according to claim 17 wherein the dead bolt and the bar, or one of the bars, co-operate to prevent the dead bqlt from being shot after the or each remote bolt has been retracted.

19._ A multi-point lock according to claim 18 wherein the bar, or the one bar, has a slot in it which registers with the dead bolt when the bar is in the shot remote bolt position and enables the dead bolt to be shot through the bar, and which slot is moved out of register with the dead bolt when the bar is in the i 1.

P S 19 retracted remote bolt position to prevent the dead bolt from being shot.

20. A multi-point lock according to claim 18 wherein the bar, or the one bar, has a slot in it comprising a main portion and a. narrower extension portion extending from the main portion longitudinally of the bar, and the dead bolt has a niched part adjacent its leading end of a reduced thickness complementary to the width of the extension portion of the slot, the slot being so positione d that when the bar is in the shot remote bolt position the main portion is in register with the dead bolt and enables the dead bolt to be shot through the bar, and when the bar is in the retracted remote bolt position the extension portion of the slot engages with the niched part of the dead bolt and prevents the dead bolt from being shot.

21. A multi-point lock according to any of claims 17 to 20 as dependent from any of claims 11 to 16 wherein the latch bolt and the dead bolt have an associated linkage which operates as the dead bolt is retracted to cause the latch bolt also to be retracted.

1

22. A multi-point lock according to claim 21 wherein the dead bolt is moved reciprocally between its shot and retracted positions by a rotary element of a key-operated locking cylinder linked by push rod means. to a rocker drivingly engageable with the latch bolt, the rotary element as it is turned in the dead bolt retracting direction operating the push rod means to rotate the rocker which drives the latch bolt to its retracted position, and the latch bolt as it is returned by its spring loading to the projected position pivoting the rocker to restore the push- rod means to an inoperative position.

1 is

23. A -multi-point lock according to any of claims 17 to 20 as dependent f rom any of claims 13 to 15 wherein the latch bolt and dead bolt move in parallel directions transverse to the direction of the linear movement of the drive member, the dead bolt is operated by a key-operated locking cylinder having a rotary element of which a part is engageable with the dead bolt to shoot and retract the dead bolt according to the direction of turning of the key of the locking cylinder, and a linkage extends and operates linearly transversely of the latch bolt and dead bolt and comprise s first and se cond push rods with the first one of which the said part of the rotary element engages to move that push rod linearly as the rotary element is turned by the key in the dead bolt retracting direction, and t he second one of which push rods co-operates with- the pivoted. rocker and is caused by said linear movement of the f irst push rod to be moved to pivot the rocker in the direction which retracts the latch bolt, the latch bolt being free to be returned to its projected position by the spring loading and causing the rotary element and linkage to be returned to inoperative positions when the said part of the rotary e lement first push rod.

is' subsequently disengaged from the

24. A, multi-point lock according to any preceding claim wherein the or each remote bolt has a c am ere nose adapted to Co-operate with an associated striker of a keeper such that when the lock is in use engagement of the chamfered nose with the striker causes the closure- to be urged against the edge member of the opening.

25. A multi-point lock according to any preceding claim wherein a catch is provided operable to prevent It k It 1 i z 21 S 0 the drive member from being actuated unintentionally to cause the remote bolt or bolts to be shot.

26. A multi-point lock according to claim 25 wherein the catch comprises a spring-loaded plunger engageable with a slot in the bar, or one of the bars, to prevent the bar, and hence the drive member, from being moved to the remote bolt shooting position.

27. In Combination an edge member of a closure or opening and a multipoint lock according to any. preceding claim.

28. The combination according to claim 27 wherein the or each bar extends along an exterior face of the edge member.

29. The combination according to claim 27 wherein the or each bar extends along a groove in an exterior f ace of the edge member.

30. The combination according to any of claim 27 to 29 wherein the control unit is received into a mortice in the edge member. 1 1

31. The combination according to any of claims 27 to 30 wherein the or each remote bolt is received into a mortice in the edge member.

32. The combination according to any of claims 27 to 31 wherein the edge member is hollow and has a face wall, the control unit and the or each remote bolt of the multi-point lock are installed substantially within the edge member with the fore-end of the control unit fixed at or adjacent the face wall, and the or each bar extends along the face wall.

14 jp 22 1

33. The combination-according to claim 27 or either of claims 30 and 31 as dependent from claim 27 wherein the edge member is hollow and has a f ace wall, the control unit and the or each re mote bolt of the multi- point lock are installed within the edge member with the fore end of the control unit fixed at or adjacent the face wall, and the or each bar extends along the inside of the face wall..

f

34. A door including the combination as claimed in any of claims 27 to 33. -

35. A multi-point lock substantially as described herein with reference to the accompanying drawings.

e I Published 1988 at The Patent Office, State House, 66171 Holborn, L)ndon WC1R 4TP. Further copies may be obtained from The Patent Office, Sales Brancli,.gt Mary Cray, Orpington, Kent BR5 ZRD. Printed by Multiplex techniques ltd, St Mary Cray, Kent. Con. 1187.