AU5940300A - A lock - Google Patents

Description

Title A Lock Field of the Invention This invention relates to door locks and in particular relates to locks for security doors.

Prior Art The following patents describe locks relating to the Field of the Invention: Australian Patent: 59281/94 Whitco\; 44650/89 Whitco\; 68822/81 Whitco\; 90098/82 Whitco\; 56567/80 Whitco\; 51837/79 Whitco\; 70972/81 Doric\; 90079/82 Whitco\; 90187/82 Whitco\; 33776/85 Whitco\; 65581/90 Whitco\; 30549/84 Byrne an Davidson\; 12029/88 Whitco\; 35210/93 JR Watts\; 17383/92 JR Watts\; 49195/93 JR Watts\; 55701/90 JR Watts; French Patents: B6133 2551126 Renault and Eliot; United Kingdom Patents: GB 2051214 A Summary of the Invention 1 According to the invention there is a lock for a door or the like, including, a casing, an auxiliary bolt supported by the casing and having a leading portion displaceable from an extended position where it protrudes from the casing, an outwardly biassed displaceable latch bolt supported by the casing and having a leading portion displaceable between a fully extended position where it protrudes from the casing and a retracted position where it is substantially within the casing, the lock having a latching configuration in which the auxiliary bolt is in the extended position and the latch bolt is restrained from displacing to the fully extended position by a first moveable member itself restrained in relation to the casing 15 by means including the auxiliary bolt said means including :i the auxiliary bolt being rendered inoperative by displacement of the auxiliary bolt from the extended :position, operating means by which to retract the latch bolt including the first moveable member and a hand operable member urged by slide means towards an undisplaced position and operable to cause the first moveable member to displace to cause the latch bolt to displace towards the retracted position, locking means to restrict the bolt from displacing to the retracted position including a key operable barrel 25 and a hand operable locking lever.

S"According to the invention, there is also provided a lock substantially as described herein with reference to and as illustrated in the accompanying drawings.

Description of the Drawings Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings Figure 1 is an isometric view of a lock in a door with a fully extended bolt, where the front edge of the lock body and the interior lever assembly are shown, Figure 2 is schematic side view of a deadlocked lock body Figure 3 is a schematic side view of the lock body with the bolt held partly retracted, Figure 4 is a schematic plan view of the lock body, Figure 5 is a partial front edge view of the lock body Figure 6 is a side edge schematic view of a lever S: 15 assembly having a slide, Figure 7 is a partial sectional schematic view of the lever assembly of Figure 6 from the back sectioned through the slide, Figure 8 is a partial sectional schematic view of the lever assembly of Figure 6 from the back sectioned through the driven cam, *o*Figure 9 is a is a side edge schematic view of an external lever assembly, Figure 10 is a partial view of the back of the lever plate of Fig. 9 showing the barrel and surrounding cylinder housing, eFigure 11 is the sectional view BB Figure 9, S" Figure 12 is the sectional view AA Fig 9, Figure 13 is a schematic plan sectional view of a lock body with a protruding bolt located within a strike plate, Figure 14 is a schematic plan sectional view of a lock body with a protruding bolt located within a strike plate where the bolt has been forced against the edge of the strike plate aperture and the lock has been forced away from the door jamb.

Figure 15 is a partial sectional schematic side view of a lock body with a pivotally displaceable bolt, Figure 16 is a is a schematic plan view of the lock body of Figure Figure 17 is a partial schematic side view of a lock body with a solenoid actuated plunger adjacent the deadlocking slide, Figure 18 is a partial schematic side view of a lever back plate having an electric motor and slide coupled to a shaft which connects to the snib cam.

Figure 19 is a schematic side view of an embodiment of a partial remote lock Figure 20 is a schematic side view of an embodiment of a remote lock with an internal slidable bolt Figure 21 is a schematic side view of an embodiment of a remote lock with a slideable bolt Figure 24 is a schematic side view of an embodiment of a remote lock with a pivotal bolt Figure 24 is a schematic side view of an embodiment of the lock Description of the Preferred Embodiments The accompanying drawings illustrate a number of embodiments of the invention which provides a number of single point door locks and multipoint locks and portions of locks which are applicable to many other types of locks without being limited to locks for security doors or locks for sliding or hinged doors. The same reference numerals are used for like components in the embodiments shown.

A embodiment of the invention comprises a lock, Figures 1 and 2, including a casing 10, a latch bolt 20 supported within the casing and displaceable under spring bias of spring 30 to extend from the casing where it can engage in a recess 2, Figures 13 and 14 within a strike plate 1 which in some cases has a fin 1A engageable by the latch bolt to facilitate latching engagement between the latch bolt and strike plate. The latch bolt is retractable by operation of a lever 61, Fig 1, in a lever assembly 60 connected to the casing by a shaft 55, Fig 7. In a preferred embodiment there is within the casing a deadlocking slide 80, Fig 2, which can be moved into engagement with a shoulder 28 on the latch bolt to restrict inward displacement of the latch bolt. This is achieved by by actuation of a key operable barrel 90, Fig 1, or actuation of other actuating means. In a preferred embodiment the latch bolt is held partly retracted by a displaceable stop which includes the auxiliary bolt 70, Fig 2, to assist in latching; in normal operation substantially simultaneous inward displacement of the auxiliary bolt and latch bolt causes release of the latch bolt to allow it to fully extend the displaceable stop being displaced to render it inoperative The lock described above is adaptable to provide multipoint locking.

The invention provides locks that are different in 20 aspects from those described in the prior art both in construction and in function. For example, the invention provides a lock which will function when inverted by having "levers that retract the latch bolt when turned in either angular directions; it provides a lock which is less 25 expensive to manufacture by combining the cylinder with the lever assembly; it provides a lever that can be quickly dismantled for packaging reasons; it provides a lock adaptable to operate remote locks; it provides a lock where the remote latch bolts are operated by the lever; it provides a means of easily adjusting the distance between the controlling (central) lock and remote locks to accommodate different spacings between the controlling lock and remote locks. It also provides a better ratio of cable movement to remote latch bolt movement than occurs in commonly used locks. The invention also provides a lock with many other beneficial features as described below and features which are transportable to other locking means.

As shown in Figure 2, the lock casing 10 is box like having a front wall 16 on the front edge, a rear wall 19 on the back edge and upper and lower ends 18 and an upper tab and a lower tab by which the casing is attachable to a door.

Within the front edge there is an aperature 11 through which in a preferred embodiment a latch bolt has passage to be displaceable to an extended position where it protrudes from the casing.

In a preferred embodiment employing an auxiliary bolt, there is also an aperature 14 through which an auxiliary bolt has passage to be displaceable to an extended position where it protrudes from the casing.

In a preferred embodiment, where the lock operates and "5controls remote locks, the rear wall 19 has an aperature through which a transmission member has passage to be connected within the casing to an arm 240 this will be described in more detail below. In an embodiment on each side of the aperature in the vicinity of the path of the transmission member there is a curved portion 19A to provide a smooth a directional change for the transmission member; the surface of the casing being a bearing surface for the transmission member 290.

Within the sides of the casing there are aperatures which support internal parts. The casing is in fact comprised of a front portion and a rear portion abutting through the aperatures wherein the rear and front portion abutt on a substantially vertical plane orthogonal to the front edge of the lock; the front portion comprising the front edge 16, the fixing tabs, side walls and top and

I

bottom walls upper and lower lower ends), preferably all as a single casting to provide greater strength. The front portion has rearwardly blades 13 which pass through mating aperatures in the rear portion and are peened over to secure the two portions together. Within the front portion there is internal webbing 12 to strengthen the casing while the aperature 11 has radiussed corners, Figure 5, to resist cracking when side loading is applied to an extended latch bolt. This construction is stronger than other constructions in common use.

In a preferred embodiment the latch bolt 20 is of a solid box like construction with radiussed top and bottom edges to mate the radii in aperature 11 and is supported between webbs 12 to be freely slideable. This latch bolt has 15 a leading portion 22 which is displaceable between a fully retracted position where it is within the casing and a fully o oo extended position where it protrudes from the casing. The latch bolt is outwardly biassed and moveable by spring and inwardly moveable by an operating arm 40 which is 20 operably connected to the lever. The latch bolt rearwardly has a recessed portion 24 within which the operating arm locates in front of a pinned protrusion 23 of the latch bolt. Rearward movement of the operating arm causes the arm to engage the pinned protrusion 23 and move it rearwardly to 25 retract the latch bolt.

In a preferred embodiment where the latch bolt is held partly extended prior to latching, the latch bolt leading portion has sides which are similarly curved on both sides as shown in Figures 4, 13 and 14, to facilitate inward displacement by the strike plate when engaging the leading portion on either side. This is to accommodate both left and right hand opening doors. In this case and where the latch bolt is held fully retracted prior to latching the operating arm passes across the latch bolt so that a shoulder 41 on its end, Fig 3, is engageable by a shoulder 71 of the auxiliary bolt 70 which on depression of the auxiliary bolt moves away from the shoulder 41 to be removed from the loci of movement of shoulder 41 to preclude engagement between the said shoulders.

In another preferred embodiment, Fig 15, the latch bolt comprises a pivotal bolt 29 angularly displaceable and supported on a pin 29A within the casing said pin preferably passes from one side of the casing to the other to be strongly secured within the casing to provide good support for the bolt. It is spring biased to displace towards an engageable position and moveable away from this position by the operating arm acting as described above.

In an embodiment the pivotal latch bolt operates entirely or substantially within the confines of the casing as may be the case when the lock is configured for sliding doors in which case the strike plate comprises a catch plate with an horizontally extending portion that fits within the o. 20 aperature 11 and which has an aperature engageable by the bolt.

In the case of a hinged door lock having a pivotal bolt, the pivotal latch bolt has a leading portion 22 is displaceable between a fully retracted position where it is S 25 within the casing and a fully extended position where it protrudes from the casing and the leading portion preferably has a hooked end which engages in and behind the strike plate aperature. The latch bolt leading portion has sides which are similarly curved on both sides as shown in Figure 16 to facilitate inward displacement by the strike plate when engaging the leading portion on either side. This is to accommodate both left and right hand opening doors.

In the embodiment where the latch bolt is held partly extended or fully retracted prior to latching, to facilitate latching; the operating arm passes across the latch bolt so that a shoulder 41, Figure 3, on its free end is engageable by a shoulder 71 of the auxiliary bolt 70 which on depression of the auxiliary bolt moves away from the shoulder 41 to be removed from the loci of movement of shoulder 41 to preclude engagement between the said shoulders, (and as occurs for the slideably supported latch bolt described above) The auxiliary bolt preferably comprises a leading portion 75 which is displaceable to extend from the casing under the action of biasing spring 73 and a rear portion comprising an angled face 72 adjacent the shoulder 71 S 15 extending towards the latch bolt. The casing has a angled rib portion 17 which when the auxiliary bolt is fully extended is adjacent the angled face 72 whereby inward displacement of the auxiliary bolt by plate fin engagement during latching causes face 72 to slide down rib 17 to displace the shoulder 71 away from the latch bolt and "operating arm shoulder 41 to disengage the operating arm.

The rear portion of the auxiliarly bolt is free to move .9• vertically against biassing means, to a limited extent.

Preferably there is threaded engagement 74 between the 25 leading portion and rear portion so that the extended length can be adjusted by rotating the leading portion to accommodate various gaps between the lock casing and strike plate so that when a door closes there is adequate depression of the auxiliary bolt by the plate fin to release the operating arm to allow the latch bolt to move forward to engage within the plate aperature.

The auxiliary bolt leading portion preferably has sides which are similarly curved on both sides as shown in Figure 4 to facilitate inward displacement by the strike plate when engaging the leading portion on either side.

The latch bolt is driven inwards against biasing by spring 30 by the operating arm 40 which is supported on a cylindrical portion of operating cam 50 which is supported in a circular aperature in the side walls of the casing.

The operating arm has an engageable shoulder 42 radially displaced from its axis of rotation displacement of which causes it to rotate to engage the protruding pin 23 of the latch bolt to drive the latch bolt inwardly. The operating cam is coupled to the lever 60 in an external lever assembly by a substantially rectangular shaft so that lever rotation causes the cam to rotate. The shaft 55 engages in a mating coaxial recess in the operating cam.

15 In an embodiment the operating cam engages the o°•o operating arm to cause it to displace; cam 50 cylindrical portion is integrally connected with a disclike portion 51 ~which supports a protruding pin 52 which is radially displaced from the axis of rotation of the operating cam.

*46* When the latch bolt is fully extended this pin is adjacent the shoulder 42 of the operating arm so that cam rotation through engagement with this shoulder causes the operating 4*O •arm to angularly displace rearwardly. The operating cam is °o ~biassed towards an undisplaced position by biassing means 25 which in this embodiment comprises a the torsion spring 54 which is located around the cam to engage the arm 51 and casing.

In a preferred embodiment,there is an operating slide 33 interspaced so that lever rotation in either direction causes the latch bolt to retract. The operating slide may be within the lever assembly but is preferably within the casing. In the latter case, Figure 3, the operating cam has two shoulders 53 one on each side of its axis of rotation and the operating slide has a corresponding shoulder 91 on each side of the axis of rotation of the operating cam adjacent an operating cam shoulder and engageable by it. The operating slide is supported between webbs 12 and 13 in the casing and is free to slide. It is biassed by springs 92 which locate within elongated recesses within the operating slide towards the operating cam. In the undisplaced position the shoulders 91 are held pressed against the shoulders 53 to cause the operating cam to adopt an undisplaced position.

Preferably the shoulders 53 are winged extensions of the operating cam and the shoulders 91 mate with these in an undisplaced position.

S.."On the operating slide is a pinned protrusion 93 which is engageable with the operating arm shoulder 42 to cause 0%eo the latch bolt to retract when the operating slide is driven forward. Although shown sliding parallel to the latch bolt the operating slide can move in any direction within the plane of the latch bolt; the important relationship is that the pinned protrusion 93 and shoulder 42 must be radially displaced from the axis of rotation of the operating arm and the pinned protrusion must move in a direction having a tangential component.

In Figures 6 to 8, the operating slide is shown within the lever assembly where the operating cam 50 is coupled to the lever by splined engagement. The operating slide on one layer has the shoulders 91 and on another layer has a pair of pinned protrusions 93 and 94 one of which engages a disclike cam 100 having integrally attached a shaft portion The disclike portion has a peripheral recess having clearance below the protrusion 93 and a radial shoulder 101 adjacent the top so that operating slide movement in response to lever rotation in either direction causes the operating slide to displace upwards against biasing by compression spring 92A to rotate the cam 100 and attached shaft which as described above connects to the operating cam within the casing. The cam 100 has a recess providing operating clearance to protrusion 94. To accommodate shaft rotation in the opposite direction a mirror image cam is employed which is operated by the protrusion 94. As in the embodiment described above, in the undisplaced position the shoulders 91 are held pressed against the shoulders 53 to cause the operating cam to adopt an undisplaced position The latch bolt is securable in the fully extended position and in a particular embodiment is securable at multiple extended positions by deadlocking means. The deadlocking means preferably includes the deadlocking slide supported adjacent the latch bolt within the casing and having a leading portion 81, Figure 2, which can be actuated by various means to displace towards the latch bolt to engage it. In an embodiment, the leading portion 81 engages behind the shoulder 28 of the latch bolt to prevent the latch bolt from being moved inwardly. In the case of multiple positions of deadlocking the deadlocking slide has multiple longitudinal engageable slots and the latch bolt has an adjacent protrusion engageable within any one of the :..slots to deadlock the latch bolt in multiple extended positions.

The actuating means includes a key operable cylinder which preferably cannot be overridden by the other actuating means, a snib locking means including a lever an electric snib locking means which is connected to a controller which in simplest form would be an electrical switch.

The key operable cylinder, Fig 3,includes a key operable barrel operably coupled to an angularly displaceable cam 110 with an armed extension 111 which locates within a concave recess 82 in the deadlocking slide which is bounded by a lower shoulder 83 and an upper shoulder 84. The deadlocking slide can be moved towards or away from the latch bolt, i.e. towards the deadlocking and from the deadlock position by cam rotation by dint of the armed extension 111 engaging one of the shoulders 84 or 83 repectively and the cam can be rotationally displaced by deadlocking slide movement. The armed extension always, within this first range of coupled movement, remains within the bounds of the shoulders 83 and 84 but when the deadlocking slide is substantially fully travelled towards the latch bolt and is in the deadlocking position the cam can be partially further rotated, within a second range of 9 cam movement, to effect a surface of contact between the extension 111 and shoulder 84 which is substantially 15 orthogonal to the cam centre of rotation thereby preventing the deadlocking slide from driving the cam at which position the deadlocking slide cannot be actuated by the other actuating means and the lock can only be released from this configuration by cam rotation. As is common the cylinder preferably comprises a double cylinder having two barrels, one on each side, and the cam is operably connected to and operable by each barrel.

The snib locking actuating means comprises a cylindrical cam 121 supported within apertures in the side walls of the casing and having a coaxial recess engageable by the shaft of a snib lever 164 in the lever assembly. The cam 120 has an armed extenstion 122 with a protruding pin 123 which locates within a substantially horizontal slotted recess 85 in the deadlocking slide so that the slide is moveable between extreme positions by snib lever rotation.

The electric snib locking means, Fig 17 and 18, comprises a solenoid 130 having a plunger 131 spring biassed 132 towards an adjacent recess 133 in the edge of the deadlocking slide such that the plunger releasably retains the deadlocking slide in an undisplaced position. There is a deadlocking spring 134 urging the deadlockig slide toward engagement and the solenoid in response to electric current retracts the plunger to release the deadlocking slide to be urged to the deadlocking position. The recess 133 may be angled to facilitate overriding by other actuating means in which case the plunger can be forced out of the recess by deadlocking slide movement.

In another case the actuating means may comprise within the lever assembly an electic motor 140 having a threaded drive shaft 141 engageable within a thread in a slide 142 supported within the lever assembly for sliding movement said slide having an elongated cross slot 143 15 within which a pinned protrusion 144 of a snib cam 145 locates; this snib cam 145 having an axial shafted extensions engageable in the recess in cam 121. The slide 142 is moveable up and down by motor rotation and as a consequence the cam 145 is angularly displaceable by motor movement to move the deadlocking slide between a deadlocking and undeadlocking position.

In a preferred embodiment the key operable cylinder comprises the angularly displaceable cam 84 supported in aperatures within the side walls of the casing and a key S 25 operable angularly displaceable substantially cylinderical barrel 90 supported in a cylinder housing 152 comprising a portion of the lever plate casing comprising part of the lever assembly 60. The barrel preferably has a peripheral end side protrusion 151 in line with the wafers 153 and similar in form to an extended wafer. The housing has the normal longitudinal elongated slotted recesses 155 to facilitate wafer movement as is well known; however in this case the recesses have end walls 156 and one end wall has an aperature 157 to permit passage of the end side protrusion so that when the barrel is inserted and rotated it cannot be removed. Preferably the cylinder barrel and cam are coaxially supported and the barrel extension engages in a recess 158 in the cam to operate the cam. Once engaged the barrel movement is restricted by its engagement with the cam to positions where the protrusion 151 does not become aligned with the aperature 157 thereby restraining barrel removal. In some cases the casing is mounted within a frame io having thin walls and the lever assembly is mounted on the exterior of the frame and the cylinder barrel extends through the frame to operably couple with the cam. To accommodate variation in the distance between the lever assembly and the casing the engagement between the barrel 15 and cam recess is splined in form.

The lever 61 is removeably retained within the lever plate casing 60. It comprises a hand operable ball or lever 62 integrally connected to a cylindrical shaft 63 which is retained free to rotate within a cylindrical aperature 64 in a boss 65 of the lever plate casing 66, (commonly referred "to as a back plate). The shaft has peripheral end protrusions 67 and the boss has elongated slotted aperatures 68 to permit pasage of the protrusions 67. When the lever is assembled onto the back plate and is rotated the lever is retained by the protrusions. Preferably there are two opposite protrusion and the coupled operating cam requires less than 90 degree movement so that once the lever is connected by the shaft 55 to the operating cam its movement is restricted so that the aperatures 68 and protrusions 67 cannot align.

It will be appreciated that prior to assembly of the lever assembly to the casing both barrels and levers can be inserted, changed as is required.

In a preferred embodiment the snib locking lever comprises an angularly displaceable cylindrical portion 161 integrally connected to its associated shaft 163 which extends from the underside of the back plate and having a hand operable portion within a concave recess at the lower extremity of the back plate and from which the hand operable portion extends in a downward vertical direction to be accessible to be operable as shown in the Figure 1 the recess providing protection from operation from the exterior of the door. Preferably the hand operable portion comprises two arms 164 and 165 which are angularly displaced in relation to each other and which projecting substantially .ooo.

radially from the cylindrical portion and have passage through an end aperature 166 in the back plate and preferably they are relatively disposed at approximately the same angle as the cam 121 moves between its limits of rotation and angularly disposed so that when the deadlocking slide is deadlocked one arm 164 is substantially retracted while when the deadlocking slide is at the other extent of its travel unlocked the other arm 166 is substantially retracted. This member is substantially supported by the shaft 163.

The invention provides for a multipoint lock and a number of embodiments employ one of the various locks described above hereafter referred to as the controlling means for at least one remote lock situated remotely from the controlling means and operably connected to the controlling means by a transmission member which transfers movement from the actuating means of the controlling means to the remote lock to operate the remote lock. In preferred embodiments the transmission member movement displaces a bolt in the remote lock between engaged and disengaged configurations and deadlocks it when in the engaged position.

In a preferred embodiment the remote lock comprises a remote moveable engaging member comprising a remote bolt 200 supported within a remote casing 210 having an aperture in the front edge to provide passage for the remote bolt as shown in the figures 19 to 23 said bolt having a leading portion 220 displaceable between a retracted position and an extended position where it extends from the remote casing said remote bolt being engageable within a remote plate aperature in catching engagement.

Within the remote casing there is a displaceable operating slide 212 and in an embodiment a spring to bias the operating slide in a direction away from the controlling means. Referring to the figures, we can see that simultaneous movement of the transmission member and operating slide upwardly causes the remote bolt to extend.

The operating slide is moveable towards the controlling .*.means by movement of the transmission member to cause the remote bolt to retract.

A number of remote bolts operate as described above; in an embodiment, the remote bolt comprises an angularly displaceable bolt,Fig 22, supported within the remote casing and having a hooked portion 213 displaceable to extend from the casing; and in amother embodiment the remote bolt comprises a displaceable bolt supported within the remote casing for sliding movement and having a leading portion displaceable to extend from the casing. The pivotal bolt has within the remote casing a side pinned protrusion 214 engaged within an elongated slot 215 within the operating slide adjacently positioned said slot having a first portion 216 substantially horizontal and providing operable coupling between the remote latch bolt and operating slide and a second joined portion 217 substantially vertical which provides deadlocking of the remote bolt by the operating slide when the remote bolt is extended. It will be appreciated by reference to the drawings that the when the pin 214 is within the slot 216 that they are coupled in slide follower a relationship.

Where the remote bolt comprises a substantially rectilinearly displaceable bolt supported within the remote casing for sliding movement and having a leading portion displaceable to extend from the casing the bolt has a side pinned protrusion 261 engageable within an elongated slotted recess 262 within the operating slide adjacently positioned said slot having a first portion 263 angled to the direction of remote slide movement and providing operable coupling 15 between the remote bolt and operating slide and a second joined portion 264 substantially parallel to remote slide movement which provides deadlocking of the remote bolt by the operating slide when the remote bolt is extended.

Preferably there is third joined portion 265 substantially parallel to remote slide movement which provides deadlocking of the remote bolt when retracted. It can be seen from Figure 23 that downward displacement of the operating slide causes the ramped upper face 263A of the slot to bear down on the pin 261 in ramping action to cause the pin to move rearwardly; movement of the operating slide upwardly similarly causes the bolt to move outwardly. It can be said that when the pin 261 is within slot 263 the pin and operating slide are coupled in slide follower relationship.

The remote engaging means may in fact comprise an adapted operating slide 275 and the remote strike may comprise a protruding pin 275A having a side recess within which the slide 275 is engageable as shown in Fig In preferred embodiments, Fig 19, fitting adjustment is obtained by the transmission member 290 having passage through a slot 281 in the remote slide and being fixable relative to the passage at multiple positions along the transmission member.

This feature enables a remote lock to be located (within a practical range) at any position removed from the controlling means; the remote lock and controlling means to be placed in functionally consistent configurations, i.e.

both deadlocked, and the threaded part 283 tightened so as to enable the transmission member to impart drive to the operating slide.

Preferably there is intersecting the slot 281 a threaded recess 282 in the operating slide in which a hollow 15 threaded part 283 engages in threaded engagement and can be .00, advanced to clamp the member 290.

In a preferred embodiment within the part 283 is a [ospring 284 to outwardly biass a ball 285.During fitting of 9*99 the lock the ball presses on the member 290 to retain the 20 transmission member just sufficiently in relation to the .00:0.

operating slide that the remote lock can be operated by the controlling means but during the first operation the actuating means of the controlling means can be forced so that the member 290 can be displaced relative to the remote slide to adopt the correct length between the connection points in the controlling means and remote lock.

The threaded part 283 is accessible by a tool through an aperture 286 in the front edge of the remote casing to be advanced to firmly clamp the member 290 to restrict relative displacement.

In an embodiment, the controlling means includes a hand operable lever operably engageable with an arm 240 by which to displace the transmission member 290. In an embodiment, the controlling means also includes a detent means to retain the transmission member in a pre-determined configuration so that the remote latch bolts can be retained retracted or in the disengaged position.

In a preferred embodiment there is within the casing the arm 240 which is preferably supported on and coaxially with the drive cam 50. The arm has an engageable shoulder 241 radially displaced from the pivot axis and is engageable by the protrusion 93 or 52 as the case may be. The other free end of the arm has a cylindrical boss to which the transmission member attaches.

On the underside of the arm is a protruding pin 243 having a substantially tangential form. Adjacent this pin II and in the same plane the deadlocking slide has an angled 15 shoulder 244 which is engageable by the pin 243 to hold the arm 240 retracted. When the deadlocking slide is undisplaced and the lever 61 is rotated to drive the arm 240 inwardly it is moveable so that pin 242 engages the sloping face of ***shoulder 244 to drive the deadlocking slide slightly towards the latch bolt. Once past the shoulder the deadlocking slide •is free to be driven back to the undisplaced position to trap the arm displaced.

Supported witin a recess on the deadlocking slide is a T component 300 having tail 301 spring biassed 302 to be engageable in a recess 304 in the inside edge of the front of the casing. The T component is held under the head 306 at extremities by shoulders 307 of the recess which permit passage of the tail between them; the spring urging the head towards the shoulders and the tail towards the recess.

During initial movement of deadlocking slide towards the latch bolt the T components rocks to remain within recess 304 while exerting a reactionary force tending to urge the deadlocking slide towards the undisplaced position. This reactionary force causes the slide to in fact be returned to the undisplaced position after engagement with the pull arm.

The T component otherwise acts to control the deadlocking slide against movement under the action of gravity or vibration.

In a preferred embodiment the lock includes a latch bolt supported within a casing and having a leading portion displaceable between a retracted position and an extended position, the latch bolt being engageable within an aperature in a strike plate in catching engagement and also engageable behind the plate aperature to provide longitudinal engagement between the plate and latch bolt to restrain the latch bolt from disengaging the strike plate. This is achieved by having a concave channel 400 in the side of the latch bolt which in 15 relation to an extended latch bolt the channel comprises an exposed orthogonal elongated concave recess extending from top to bottom of the side of the latch bolt said channel preferably having an inclined wall 401 on the leading side of the latch bolt said inclined wall being engageable by the edge 402 of the plate 20 recess when under jimmy action the latch bolt is forced against the edge 402 of the recess. The inclined wall enables the latch bolt to be retracted without catching on the edge of the aperture .**whereas a recess having an orthogonal "straight" side may catch and impede the latch bolt from retracting in normal unlatching.

25 It will be appreciated that the steeper the angle the better the 55.5.0 S* snagging engagement but the greater the risk of fouling a satisfactory trade off has been achieved with the design shown in the figures. The remote bolts comprising part of the remote locks described below also preferably have a channel as described immediately above.

In another preferred embodiment a ridge is substitute for the channel wherein in relation to an extended latch bolt, (or bolt) the ridge comprises an exposed orthogonal elongated convex ridge extending from top to bottom of the side of the latch bolt said ridge having an inclined wall on the trailing side of the latch bolt said inclined wall being interactively engageable by the strike plate recess to provide longitudinal engagement when the inclined wall and plate are urged relatively together.

In the case of the pivotal latch bolt 29 the hooked portion 213 engages behind the aperature in the plate.

In yet another embodiment there is hooked member 420 supported within the latch bolt which is is actuateable by the deadlocking slide; the hooked member comprising a pivotally supported member having an arm 421 extendable from the latch bolt to engage behind the strike plate 422 and an actuating arm 423 with a pinned protrusion 424 in an So orthogonal elongated slot 425 in the deadlocking slide whereby the extendable arm is actuateable by deadlocking 15 slide movement to cause the arm 421 to extend. The deadlocking slide is preferably supported adjacent the latch bolt and has multiple longitudinal engageable slots 451; the *0 latch bolt having an adjacent protrusion engageable 452 within any one of the slots to deadlock the latch bolt in 20 multiple extended positions.

S•In this embodiment the strike plate is engaged by the latch bolt both longitudially and horizontally in all directions. Because of this the lock is suitable for use in *e 5 0 both sliding and hinged doors being able to locking in multiple extended positions obviates the need for adjustment in sliding doors.

In a preferred embodiment the plate comprises a fixable first portion 460 connected to a second portion 461 by a deformable interconnecting portion 462 said second portion including the engageable aperature within and behind which the latch bolt is engageable; the second portion being displaceable relative to the first portion to restrain relative displacement between the bolt and plate aperature.

As stated above, the removeably retainable barrel, the removeably retainable lever, the form of the snib lever, the remote lock, the means of providing different relative locations of the remote locks, the jimmy resistant means and other features are applicable to many locks apart from those described in detail herein and may of the features are transportable in whole and in part to become parts of other locks.

The positional prepositions such as rear forward are used in reference to the accompanying drawings to assist in description of the preferred embodiments and have in general no absolute other significance.

00004 0 0 Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", 15 and variations such as "comprises" or "comprising", will be *understood to imply the inclusion of a stated integer or group of integers or steps but not the exclusion of any other integer or group of integers.

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