AU633318B2

AU633318B2 - Locks

Info

Publication number: AU633318B2
Application number: AU55701/90A
Authority: AU
Inventors: John Russell Watts
Original assignee: Austral Lock Pty Ltd
Current assignee: Austral Lock Industries Pty Ltd
Priority date: 1989-05-19
Filing date: 1990-05-21
Publication date: 1993-01-28
Anticipated expiration: 2010-05-21
Also published as: AU5570190A

Description

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AUSTRALIA

PATENTS ACT 1952 COMPLETE SPECIFICATION Form

(ORIGINAL)

FOR OFFICE USE Short Title: Int. Cl: Application Number: Lodged: Complete Specification-Lodged: Accepted: Lapsed: Published: Priority: Related Art: TO BE COMPLETED BY APPLICANT Name of Applicant: Address of Applicant: Actual Inventor: JOHN RUSSELL WATTS 42 EXPORT DRIVE CITY-LINK ESTATE FRANCIS STREET BROOKLYN, VIC. 3025

AUSTRALIA

JOHN RUSSELL WATTS Address for Service: GRIFFITH HACK CO., .J.

601 St. Kilde Road, Melbourne, Victoria 3004, Australia.

Complete Specification for the invention entitled:

"LOCKS"

The following statement is a full description of this invention including the best method of performing it known to me:-

LOCKS

This invention relates to locks and in particular to deadlocking screen door locks.

Locks for security doors have undergone considerable development in the last few years. Earlier locks required a model for right hand closing doors and another model for left hand closing doors. Locks then were provided with the facility to quickly reverse the tongue.

Australian Patent 578811 overcame the difficulty of reversing a tongue by having a 'bull-nosed' tongue that suits both left and right hand closing doors. Australian Patent Application 12029/88 discloses an adaptation of the lock of Patent No. 578811 and provides latching with a fully extended bolt.

One of the functions that remains unaddressed is the vulnerability of doors to jemmying that is the use of a cross-bar to achieve forced entry.

-2- 6" N.

j According to the present invention there is provided a lock comprising a lock casing, a locking bolt pivotally displaceable relative to the casing from a first position in which the bolt is substantially within the casing to a second position in which the bolt extends out of the casing, biasing means to urge the bolt to pivot to the second position, a detent to restrain the bolt from pivoting from the first position to the second position and trigger means to release the detent to cause the bolt to be pivoted by the biasing means into the second position.

According to the present invention there is further provided a lock comprising a lock casing, a locking bolt pivotally displaceable relative to the casing between a first position in which the locking bolt is substantially within the casing, an intermediate position in which the locking bolt extends a short distance from the casiag, and a second position in which the locking bolt extends a substantial distance from the casing, biasing means to urge the locking bolt to pivot towards the second position, a detent to restrain the bolt from pivoting from the intermediate position to the second position, and trigger means to displace the detent to allow the locking bolt to be pivoted to the second position.

According to the present invention there is still further provided a lock including a lock casing, a bolt displaceable from a disengaged configuration, biasing means to urge the bolt to displace from the disengaged configuration, detent means to restrain the bolt from displacing from the disengaged configuration and trigger means to release the detent to allow the bolt to displace to a second configuration where it engages a member on an associated door jamb in lateral and transverse horizontal directions.

According to the present invention there is still 3 further provided a lock including a lock casing, a bolt displaceable from a disengaged configuration, biasing means to urge the bolt to displace from the disengaged configuration, detent means to restrain the bolt from displacing from the disengaged configuration, trigger means to release the detent to allow the bolt to displace to a second configuration where it engages a member on an associated door jamb in lateral and transverse horizontal directions, deadlocking means displaceable between unlocked and locked configurations in which the bolt is respectively displaceable and in which the bolt is prevented from displacing from the engaged configuration, at least one remote auxiliary lock including a casing and an auxiliary lock bolt displaceable between a disengaged configuration and a second rconfiguration where it engages a member on the door jamb in lateral and transverse horizontal directions said auxiliary lock bolt being operably associated with the deadlocking means such that displacement of the auxiliary lock bolt to the second position occurs concurrently with displacement of the deadlocking means to a locked configuration.

Embodiments of the invention will now be described by way of example only with reference to the accompanying drawings in which:- Figure 1 is a perspective view of a door showing a lock, Figure 2 is a plan view of strike plate, Figure 3 is a schematic side view showing a return hook of a locking bolt engaging the strike plate with lateral clearance, Figure 4 is an internal view of a lock forming a first embodiment with the cover plate removed for clarity and the bolt fully withdrawn, Figure 5 shows the lock with the bolt fully extended, Figure 6 shows the lock with the bolt fully extended and deadlocked through use of a snib, Figure 7 shows the lock with the bolt fully extended and deadlocked through use of first type of keyed cylinder, Figure 8 is an internal view of a lock forming a second embodiment with its cover plate removed for clarity and the bolt fully withdrawn, Figure 9 shows the lock with the bolt fully extended, Figure 10 shows the lock with the bolt fully extended and deadlocked through use of a snib, Figure 11 shows the lock with the bolt fully extended and deadlocked through use of a second type of keyed cylinder, Figure 12 is a side on view illustrating a mechanism attached to the lock to make the lock into a multi-point lock, Figure 13 is a side on view showing the lock in the engaged position, Figure 14 is an enlarged view of the area within the rectangle X of Figure 12, Figure 15 is a plan view of an auxiliary lock that forms part of the assembly shown in Figures 12 and 13, Figure 16 is a side on view of the auxiliary lock shown in Figure 15, and Figure 17 is a schematic view of the assembly when mounted on a door housed within a door jamb.

The accompanying drawings illustrate two embodiments of a deadlocking screen door lock. The main difference between the two embodiments is that the locks have been adapted to utilise two common forms of keyed cylinders. The same reference numerals are used for like components in both embodiments. In summary, the lock comprises a locking bolt 20 that is driven inwardly by a handle 11 and outwardly a spring 22, an auxiliary bolt 31 which is depressed by engagement against a striker plate associated with the door jamb effects release of the locking bolt so that it is urged into a fully extended position by the spring 22. A deadlocking slide is positioned to move from a disengaged position to an engaged position where it engages the rear of the locking bolt to prevent forced return of the locking bolt. The deadlocking slide may be actuated either by a rotatable snib 12 or the actuating member of a keyed cylinder 14. A locking rocker 80 is used to ensure against return of the deadlocking member when locked through the keyed cylinder.

The lock is designed for use in both left and right hand doors. In a preferred embodiment, the locking bolt is of the "beak type" that is, having a hooked end that provides both lateral and longitudinal engagement with the recess and striker plate of the door jamb. It is however 5 understood that a more conventional sliding locking bolt that only provides lateral engagement with the recess in the striker plate is also envisaged by the invention in its broadest aspect.

Figures 1 and 3 illustrate the lock in association with a door and striker plate, and Figures 4 to 7 illustrate in detail the internal components of a lock forming a first embodiment, whilst Figures 8 to 11 are similar views showing the internal components of a lock forming a second embodiment.

The lock comprises a rectangular casing 62 the cover of which has been removed for clarity. The casing has a rear face 63, top 65 and bottom 66, underside 61 and front face 64. The front face 64 has a pair of apertures through which the locking bolt 20 and auxiliary bolt 31 respectfully extend. The locking bolt 20 is formed out of comparatively flat plate to have a mounting portion 26 that has a central aperture 26A which locates over a pin 25 tha extends from the underside 61 of the lock casing. The bolt terminates in a downturned hook 21 which has a leading edge 27, both sides of which are similarly curved to allow either side to ride over the associated striker plate 2 (Fig. The lock bolt 20 is mounted on the pin together with a spring 22 that has one arm 29 in engagement with a rear face of the head of the bolt 20 and the other arm 22Ain engagement with the inside of the front face 64 of the casing. The spring is mounted so that it tends to urge the bolt into the fully extended position shown in Figure 5. The outer surface of the lock bolt 20 as shown is arcuately curved and terminates in an upstanding lug 23.

The auxiliary bolt 31 comprises a substantially cylindrical body that terminates in an inclined outwardly projecting face 39. The inner end of the cylindrical body has a collar 32 which engages one end of a spring 36A which is mounted on a pin 36 and has its opposite end in engagement with the rear face of a folilower 34 which is an elongate plate mounted for pivotal movement about a pin 34A. The spring 36Aurges the auxiliary bolt 31 to the 6 outwardly projecting position as shown in Figures 4 and The lug 23 on the outer surface of the bolt 20 is arranged to engage against a corner 35 of the follower 34 to hold the bolt in a position (not shown) where the hook 21 extends a short distance out of the casing that allows the bolt to slide past the striker plate 2. The engagement of the follower 34 against the lug 23 also prevents the bolt from being urged into the fully extended position by the spring 22. As the auxiliary bolt is pressed into the casing against the spring 33 on engagement with the striker plate 2, the follower 34 is lifted clear of the lug 23 to effect release of the locking bolt which is then urged forwardly into the fully extended position by the spring 22.

The inward end of the main body portion of the bolt is pinned in pivotal relationship to an intermediate rocker 40 that is in turn located by a casing pin 68 which is arranged to be a sliding fit within a slot 68A formed in the other end of the intermediate rocker. Both the bolt and intermediate rocker 40 are arranged to sit on an elongate deadlocking slide 50 that rests against the underface 61 of the casing and is located by casing pins and 68, elongate slots 90 and 91 formed in the deadlocking slide facilitate relative movement.

As shown in Figure 1, the lock includes lever back plates 10 that are mounted on either side of the door and support handles or levers 11. The levers are interconnected by means of a spindle (not shown) which engages a recess 46 in a drive cam 44 to import rotation movement to the cam. The drive cam has an arm portion that is arranged to push on a face of the intermediate rocker 40 so that depression of the handle causes the arm to push the intermediate rocker 40 towards the front face of the lock casing (Fig. 4) thereby causing the locking bolt 20 to pivot about the pin 25 through the pivotal location between the intermediate rocker 40 and the 7 inner end 26 of the body portion of the lock bolt. Thus depression of the handle 11 has the effect of causing the locking bolt 20 to be drawn back into the lock casing to the position as shown in Figure 4 whereby the door can be opened. Release of the handle 11 causes the handle to return to a neutral position because of a spring (not shown) in the handle mechanism. The locking bolt 20 moves outwards until the lug 23 engages the follower 34.

A snib lever 12 is mounted on the lower end of the lever back plate 10 as shown in Figure 1. The lever 12 is connected through a shaft of square cross section, not shown, to a snibbing cam 70 with an associated arm and pin protrusion 71 that slides in a slot 54 provided in the lower end of the deadlocking slide 50. The upper end of the deadlocking slide 50 has an annular shoulder 56 which lies in an annular recess formed on the rear of the locking bolt 20 when in the unlocked position but when in the deadlocked position is caused to be displaced upwardly as shown in Figures 6 and 7 to engage the rear face 29A of the locking bolt to prevent its return into the lock case.

Upward movement of the deadlocking slide 50 also has the effect of urging the bolt 20 to assume the fully projecting position of Figures 6 and 7 should for some reason the spring 22 not have effected the full displacement. Thus rotation of the snibbing cam 70 causes the deadlocking slide to be displaced upwardly to the position as shown in Figure 6 to effectively deadlock the lock.

The lock also includes a keyed cylinder 14 which in the first embodiment (Figs. 4 7) comprises a cam with an integral arm 76 which is displaceable by the key through three positions; a first unlocked position shown in Figure where it locates between shoulders 52 and 53 formed on an inward face of the deadlocking slide, a second position shown in Figure 6 whereby it is again between the shoulders 52 and 53 on the slide but the slide has been displaced upwardly to the deadlocked position by the snibbing cam 8 and a third locked position shown in Figure 7 where the arm 76 has been rotated upwardly in a counter clockwise direction to move pass the shoulder 53 on the deadlocking slide out of contact with an inner curved surface 84 that is formed on elongate plate that constitutes a locking rocker 80. The locking rocker 80 is mounted on top of the deadlocking slide 50 about the casing pin 68 and is urged towards the rear face of the lock case by a spring 95 which is mounted on a pin 96 to have arms 97 and 98 that respectfully engage the rear wall 66 of the casing and the forward edge of the locking rocker 80. As the arm 76 of the keyed cylinder moves to the position, the spring urges the locking rocker 80 to move rearwardly to the position shown in Figure 7. When in this position downward projections 83 of the locking rocker engage upward projections being an extension to the shoulder 52 on the slide 50 to prevent the slide from returning to the unlocked position shown in Figure 5. Thus the snib is rendered ineffective with a result that the lock can only be released by use of the key to turn the arm 76 of the keyed cylinder clockwise through the positions discussed above to in effect cause the locking rocker 80 to move back against the spring to the position shown in Figure 6 which disengages the projections 83 on the rocker 80 and projection 52 of slide 50. The intermediate rocker 40 has a shoulder 43 on its underside that prevents rotation of the handle when the deadlocking slide 50 and intermediate rocker 40 are in the locked position shown in Figures 6 and 7.

In the second embodiment illustrated in Figures 8 to 11, a different type of key operated cylinder is used to effect locking of the lock. This cylinder 115 is one which always return its drive cam 116 to the same position on key removal and this is shown as the disengaged vertical position in Figures 8 to 11 which means that the various 9 effects of the keyed cylinder have to be conducted by displacement of the cam 116 co-operating with the deadlocking slide 150 and an alternate form of locking rocker 101. The rocker 101 is pivotably or slidably secured to the locking slide 50 by a fixed pin 108 and a pin assembly 121 that extends through an arcuate slot 118 in the slide 50 to locate adjacent a shaped path 109 that is formed either by the underside 61 of the casing or on a separate plate that rests on the underside 61 of the casing. A small spring (not shown) is positioned within the pin assembly 121 to urge a slidable pin 122 into continual engagement with the path 109 which preferably has a ramped bottom to cause the pin to ride down the ramp as the deadlocking slide moves upwardly and rearwardly to the locked position. A spring 119 urges the rocker 101 towards the cylinder 115 and the rocker has a projecting lug 104 which in the unlocked position shown in Figs. 8 and 9 extends into the path of the cylinder cam 116.

When the lock is snibbed as shown in Figure 10 the snib cam 70 causes slide 50 to move upwardly to engage the rear face of the bolt 20. The rocker 101 remains in the unlocked position with the lug 104 in the path of the cylinder cam 116. The pin 122 of the rocker 101 can ride between extremities of the path 109 in either direction to allow movement of the slide. However, when the keyed cylinder is used to deadlock the lock the cam 116 moving anticlockwise pushes the lug 120 towards the front of the lock causing the pin 122 to move adjacently around the path 109 while the spring biased pin 122 slides in engagement with the path 109 under the slide 50. The cam 116 engages a shoulder 106 on the slide 50 causing upward movement of the slide and rocker to the deadlocked position shown in Figure 11. In this position, the spring 119 urges the rocker 101 to move towards the rear face of the lock and the pin 122 rides down the ramp to engage a step 111. The 10 step 111 prevents further movement of the pin and thus prevents movement of the deadlock slide 50 unless the cylinder cam 116 again displaces the rocker 101 away from the position shown in Figure 11. Although the step 111 is preferably formed as an abruptly ending slot with a ramped bottom in the shaped path it is understood that other forms of steps or shoulders are envisaged as capable of carrying out the same functior Although in the embodiments shown in Figures 1 to 11, the locking bolt has a hooked end portion and rotates about a pin to the fully extended portion in which the hooked end portion both laterally and longitudinally engages behind the striker plate of the door jamb, it is understood that this invention also embraces a more usual type of locking bolt that merely slides laterally outwardly of the lock face. It is further understood that the invention in its broadest aspect embraces a variety of bolt operations. The bolt may be displaceable through three positions namely, the position shown in Figures 4 and 8 in which the bolt is pulled fully back by the handle to be substantially within the confines of the lock casing, the position that is not shown in the drawings in which the hooked end of the bolt projects out of the casing a short distance and the detent 34 prevents further forward movement of the bolt but the bolt can slide past the striker plate and a third position in which the bolt is urged by the spring to project out of the lock casing a substantial distance to provide comprehensive security and avoid the danger of the bolt slipping out of the door jamb in a poorly fitting door. The longitudinal and lateral location of the hooked end of the locking bolt is particularly effective against jemmying of the lock.

11 In another design the locking bolt only assumps two positions, namely the fully withdrawn position in whiul th detent holds the bolt fully within the casing, and the fully extended position where the bolt engages the door jamb. This arrangement has the advantage that the only component that rides against the striker plate is the auxiliary bolt. Since the locking bolt does not have to ride against the striker plate, there is no need to design it to accommodate either a left or right hand door.

The auxiliary bolt 30 is arranged to be axially rotatable by simply pulling the bolt slightly out of the casing and turning it about its longitudinal axis to reverse the direction of inclination of the inclined face 39. This is a simple yet most effective way of reversing the hand of the lock. However, it is also envisaged that both the main and auxiliary bolts could have similarly curved or tapered profiles on either side so that the bolts can ride up a striker plate as the door approaches from either direction.

Another structural feature of the lock described that contributes to the efficient operation of the lock is the pin location between the intermediate rocker and the end of the bolt. The use of a fixed pin as against the more conventional use of a pin in a slot ensures that the distance between the fixed pin and axis of rotation of the bolt is maintained constant, thus the moment applied to throw the bolt is better able to complete the operation in contrast with the situation where a pin rides up the slot to approach the axis of rotation of the bolt and substantially reduce the moment that is applied to the bolt.

In the embodiment shown in Figures 12 to 17, the lock is converted into a multi-point lock by the attachment of remote or auxiliary locks 220 coupled by actuating rods 213 to the main lock body 10. The auxiliary locks are arranged so that actuation of the snib 12 or deadlocking 12 member of the main lock causes the auxiliary locks to move to the locked position shown in Figure 17 where locking tongues 212 engage within associated recesses in the door jamb. Drive is imparted to the actuating rods 213 by a double ended locking lever 203, opposite ends 203A and 203B of which engage respectively into a recess 230, 231 positioned in the end of the respective actuating rods.

The lever 203 is pivotally mounted about a pin 234 for movement between an engaged and disengaged position by a pair of meshing gears forming a gear train 207 that is in turn driven by the squaied shaft 204 of the snib 70 of the lock that is driven by the snibbing lever 12, see Figures 1 and 17. The gear train 207 and associated mechanism that drives the locking lever 203 including the lever itself is mounted externally of the lock casing within the lever housing 10 so that the actuating rods 213 extend externally of the door as shown in Figure 17. Similarly, the auxiliary locks 220 are mounted externally of the door so that the locking tongues 212 can engage in suitably mounted housing on the external face of the door jamb. The arrangement is such that displacement of deadlocking slide by either the keyed cylinder or the snib causes through the gear train 207 the locking lever to pivot from the disengaged position as shown in Figure 12 in which the rods ars pulled towards the casing and both auxiliary locks are unlocked with the tongues 212 pulled within the casing or !-he locked position shown in Figure 13 whereby the actuating rods 213 are displaced away from the central casing to cause the locking bolts to be displaced out of their associated casing into the locked position. Each end of the locking lever 203A and 203B is provided with a projecting pin 205 that engages within the walls of a slot 206 in the end 201 or 202 of the actuating rod 203.

Rotation of the locking lever causes the pins to impart linear movement to the actuating rods. The pins 205 have a flat end 208 and the slots have faces 209 which in the 13 fully locked and fully unlocked positions of the rods are substantially orthogonal to the point of rotation of the locking lever 203 so that an axial force on the rod is prevented from causing rotation of the locking member 203 since the result of forces have a direction through the point of rotation. It is understood that in another arrangement not shown, the end of the actuating rods may be in geared association with the locking lever 203 with the gearing being such that the lock cannot be returned to the unlocked position by mere actuation on the rods.

As shown in Figures 15 and 16, each auxiliary lock 220 comprises a locking bolt 212 with a hooked extension 211 pivotally mounted in a housing 214 which is arranged to straddle the associated actuating rod 213 so that the auxiliary rod may be mounted in a range position along the rods. A pin 216 mounted on a slidable plate 217 locates in an elongate slot 218 in the locking bolt and moves the bolt from a fully withdrawn position to a fully extended position as the deadlocking slide of the main lock moves from the unlocked to the deadlocked positions. The slidable plate 217 is attached to the actuating rod 213 through a pin (not shown) that locates in a recess at the end of the rod.

A further feature of the lock described above as illustrated in Figure 17 is that the extreme ends 214 of the actuating rods 213 may be arranged to be displaced outwardly of the door to engage corresponding recesses in the top and bottom of the door jamb respectively as shown in Figure 17. Thus, in the locked position there is a five-point lock, namely the central lock 10, the two auxiliary locks 220 and the location of the ends of the actuating rods 240.

In other embodiments not shown the tongue of the locking bolt is bored to take a hardened pin to render the bolt more difficult to cut with a hacksaw. It is also envisaged that the tongue of the bolt could include barbs on either side located in recesses in the tongue and biased to spring outwardly after the tongue has moved past the striker plate and into the recess defined by the door jamb.

14

Claims

1. A lock comprising a lock casing, a locking bolt pivotally displaceable relative to the casing from a first position in which the bolt is substantially within the casing to a second position in which the bolt extends out of the casing, biasing means to urge the bolt to pivot to the second position, a detent to restrain the bolt from pivoting from the first position to the second position and trigger means to release the detent to cause the bolt to be pivoted by the biasing means into the second position.

2. A lock comprising a lock casing, a locking bolt pivotally displaceable relative to the casing between a first position in which the locking bolt is substantially within the casing, an intermediate position in which the locking bolt extends a short distance from the casing, and a second position in which the locking bolt extends a substantial distance from the casing, biasing means to urge the locking bolt to pivot towards the second position, a detent to restrain the bolt from pivoting from the intermediate position to the second position, and trigger means to displace the detent to allow the locking bolt to be pivoted to the second position.

3. A lock according to claim 2 wherein the bolt has a tongue which protrudes from the casing when the bolt is in the intermediate position, said tongue being similarly curved on both sides.

4. A lock according to any one of the preceding claims wherein the trigger means comprises an auxiliary bolt that is biased to extend out of the casing.

A lock according to any one of the preceding claims wherein the locking bolt has a hooked end which in the second position locates behind a striker plate on an associated door jamb to engage the plate in lateral and transverse horizontal directions to resist relative translation between the bolt and plate in all directions.

6. A lock according to claim 4 wherein the auxiliary bolt is axially rotatable.

7. A lock according to claim 4 wherein the auxiliary bolt has a tongue portion profiled on both sides to facilitate latching.

8. A lock according to any one of the preceding claims wherein the lock has an externally operable handle on at least one side of the casing, the handle being connected to a cam that on movement of the handle engages and displaces an intermediate rocker which engages the bolt to cause the bolt to retract.

9. The lock according to any one of the preceding claims wherein a deadlocking means is displaceable between a configuration in which the bolt is displaceable and a configuration in which the deadlocking means prevents displacement of the bolt from the second position.

A lock according to claim 9 when dependent on claim 8 wherein the deadlocking means when in the deadlocked configuration renders the intermediate rocker immobile.

11. A lock according to claim 9 wherein a manually operable snib is in engagement with the deadlocking means and actuatable to cause the deadlocking means to displace between locked and unlocked configurations.

12. A lock according to claim 9 and including a key operable lockable cylinder in engagement with the deadlocking means and actuatable to cause the locking means to displace between locked and unlocked configurations.

13. A lock according to claim 12 wherein the deadlocking means includes a displaceable deadlocking member and a restraining means to restrain the deadlocking member from displacement.

14. A lock according to claim 13 wherein the 16 A restraining means includes a rocker pivotally or slideably attached to the deadlocking member and biased into a first position permitting actuation of the snib to cause the deadlocking member to move between the unlocked and deadlocked positions, the rocker being displaceable by engagement with an arm of the cylinder to a second position where a projection of the rocker engages a gate adjacent the deadlocking member to prevent further movement of the rocker and deadlocking member and prevents movement from the deadlocked position, release being effected only by displacement of the rocker from the second position by rotation of the arm by a key.

A lock according to claim 9 further comprising two primary operable actuating means in the form of a key operable cylinder or thumbturn positioned one on each side of the lock casing and a secondary operable actuating means in the form of a thumbturn positioned on one side of the casing each operable means engageable with the deadlocking member to cause the deadlocking member to displace between a configuration in which it does not restrain the bolt from displacement and a configuration in which the bolt is restrained from displacement such that if the deadlocking member is driven by a primary operable means to the configuration in which it restrains the bolt it can be returned to the unrestraining configuration only by the primary means but if the deadlocking member is driven by the secondary operable means to the configuration in which it restrains the bolt then it can be returned to the unrestraining configuration by either secondary or primary operable means.

16. A lock including a lock casing, a bolt displaceable from a disengaged configuration, biasing means to urge the bolt to displace from the disengaged configuration, detent means to restrain the bolt from displacing from the disengaged configuration and trigger means to release the detent to allow the bolt to displace to a second configuration where it engages a member on an associated door jamb in lateral and transverse horizontal directions.

17. A lock substantially as described herein with reference to and as illustrated in Figures 1 to 7 of the accompanying drawings.

18. A lock substantially as described herein with reference to and as illustrated in Figures 1 to 3 and 8 to 11 of the accompanying drawings.

19. A multi-point lock including a lock according to any of the preceding claims and including at least one auxiliary lock positioned remote from said lock, said auxiliary lock including a casing and an auxiliary lock bolt displaceable between a first position where it is substantially within the casing and a second position where it extends from the casing, said bolt actuatable by means interconnecting the lock and auxiliary lock.

A multi-point lock according to claim 19 when dependent on claim 9 wherein the means interconnecting the lock and auxiliary lock is operably associated with.the deadlocking means such that displacement of the auxiliary lock bolt to the second position occurs concurrently with displacement of the locking means to a locked configuration.

21. A multi-point lock according to either claim 19 or 20 wherein the means interconnecting the lock and auxiliary lock comprises an actuatuable rod.

22. A multi-point lock according to claim 21 wherein the deadlocking means is operably associated with a pivotal member one end of which engages the actuating rod, pivotal movement of the pivotal member displacing the actuating rod to move the auxiliary lock bolt between extended and 18 1':C/ retracted positions.

23. A multi-point lock according to any one of claims 19 to 22 wherein the auxiliary lock bolt is pivotally displaceable.

24. A multi-point lock substantially as described herein with reference to and as illustrated in Figures 12 to 17. A lock including a lock casing, a bolt displaceable from a disengaged configuration, biasing means to urge the bolt to displace from the disengaged configuration, detent means to restrain the bolt from displacing from the disengaged configuration, trigger means to release the detent to allow the bolt to displace to a second configuration where it engages a member on an associated door jamb in lateral and transverse horizontal directions, deadlocking means displaceable between unlocked and locked configurations in which the bolt is respectively displaceable and in which the bolt is prevented from displacing from the engaged configuration, at least one remote auxiliary lock including a casing and an auxiliary lock bolt displaceable between a disengaged configuration and a second configuration where it engages a member on the door jamb in lateral and transverse horizontal directions said auxiliary lock bolt being operably associated with the deadlocking means such that displacement of the auxiliary lock bolt to the second position occurs concurrently with displacement of the deadlocking means to a locked configuration. DATED this 20th day of November, 1992. JOHN RUSSELL WATTS By His Patent Attorneys GRIFFITH HACK CO. Fellows Institute of Patent Attorneys of Australia.