AU690580B2

AU690580B2 - A lock

Info

Publication number: AU690580B2
Application number: AU77719/94A
Authority: AU
Inventors: John Russell Watts
Original assignee: Austral Lock Pty Ltd
Current assignee: Austral Lock Industries Pty Ltd
Priority date: 1993-11-09
Filing date: 1994-11-09
Publication date: 1998-04-30
Anticipated expiration: 2014-11-09
Also published as: AU7771994A

Description

Rogulation 3,2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT Invention Title:

.I-

following statement Is a full description of this Invention, Including the best .:.method of performing It known to me:- 0 0 a. .a .9 P *OPE'RWSlt7I19f 1 SI'. S-2.1M -1- A LOCK This invention relates to door locks and in particular relates to locks for security doors.

According to the invention, there is provided a lock comprising a first casing, a first slidable bolt supported within the first casing and displaceable between an extended position where it protrudes from the first casing and a retracted position where it is substantially within the first casing, a first bolt actuating means to cause the first bolt to displace towards the retracted position comprising an external angularly displaceable lever and a pivotally displaceable drive arm engageable with the first bolt, said pivotally displaceable drive arm being operably engageable with the external lever whereby operation of the lever causes the drive arm to retract the first bolt, restraining means for restraining the first bolt from displacing towards the extended position, said restraining means comprising an outwardly 15 biassed auxiliary bolt engageable with the pivotally displaceable drive arm to prevent outwards displacement of the first bolt, said restraining means being releasable and to allow the pivotally displaceable drive arm and first bolt to displace towards the extended position, such release resulting from displaceme .t of the auxiliary bolt.

20 Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 is a schematic side view of a lock where the bolt is retained retracted by the drive arm; Figure 2 is a schematic side view of the lock of Figure 1, where the bolt is unretained and is extended; Figure 3 is a schematic side view of the lock of Figure 1, adapted to provide multipoint locking where the bolt is unretained and is extended and the remote lock has an angled slot, the remote lock having an extended bolt; Figure 4 is a schematic drawing showing the angular disposition of the slot in remote ,30 lock bolts; POV[rRPt.il77119 14 W 231W -2- Figure 5 is a plan view of the lock of Figure 1.

The accompanying drawings illustrate an embodiment of a deadlocking screen door lock and an embodiment of a multi point lock, The lock comprises a box-like casing 10 having a front wall 16, a rear wall 17 and sides 18, a substantially rectangular bolt 20 supported in the casing and displaceable through an aperture 11 in the front wall of the casing between an extended and a retracted position.

The bolt 20 is driven inwards against spring bias 30 by a drive arm 40 which is supported on a cylindrical portion of cam 50 which is supported in a round aperture in the side walls of the casing, The cam 50 can engage the drive arm 40 to cause it to rotate while the drive arm engages a protruding pin 21 of the bolt 20 to drive the bolt 20 inwardly. The cam 50 is coupled to a lever 60 of an external lever assembly by a rectangular shaft so that lever rotation causes the cam 50 to rotate. There is some free movement in the coupling between the cam 50 and drive arm 40 so that the cam 50 and lever 60 can remain undisplaced while the bolt 20 displaces between extended and retracted positions and as a consequence the drive arm 40 displaces in a manner determined by the bolt 20. This movement is achieved by the cam 50 having the cylindrical portion 51 integrally attached to a disc-like portion 52 which supports a protruding pin 53 displaced from the axis of rotation of the cam 50. When the bolt 20 20 is fully extended this pin is adjacent a substantially radial protruding shoulder 42 of the arm 40 so that cam rotation through engagement with this shoulder causes the drive arm to angularly displace rearwardly.

Supported within the casing there is also an auxiliary bolt 70 which is displaceable through an aperture 12 in the front wall of the casing between an extended and a retracted position. The auxiliary bolt 70 is outwardly biassed by spring 31. In practice the auxiliary bolt 70 is inwardly displaced by sliding up a ramped surface of a strike plate.

A deadlocking slide 80 is actuable by a key operable cylinder 81 and an external locking lever 02 within the lever assembly, displacement of the slide 80 causing its leading PI) PULUSIN1~9941C 23)2MV -3 edge 83 to locate behind shoulder 22 of the bolt 20 to prevent inward displacement of the bolt Due to engagement between the pin 21 of the bolt 20 and drive arm 40, the drive arm is restrained from inwardly displacing when the bolt 20 is restrained in the extended position. The locking lever 82 is connected to an armed cylindrical cam 85 by a rectangular rod. The cam 85 is supported in a round aperture in the side walls of the casing while the armed extension supports a pin 87 which locates in a slot 88 in the deadlockig slide In the embodiment as shown in Figure 1 the auxiliary bolt 70 has one or more shoulders 71 adjacent a shoulder 41 of the drive arm 40 with which it is engageable to restrain the drive arm 40 from displacing forwvardly, When the auxiliary bolt 70 is inwardly displaced a rear angled face 72 slides up a ramped abutment 13 of the wall of the casing and the shoulders 71, in addition to being displaced inwardly, displace away from the drive arm e*to disengage it.

i1 The above embodiment may be adapted as shown in Figure 3 to provide a multipoint lock. The lock provides an armied extension 54 to the cam 50 within which there is a pin protrision 55 at a distance displaced from the axis of rotation of the cam 50. The pin locates in an elongated slot of a displaceable slide member 90 which is supported by the rear wall of :**the casing. The slide 90 has elongated apertures through which rivets pass to hold the slide adjacent the rear wail while being free tu translate vertically within limits. The slide 90 is operably connected to a remote lock, not shown, by an elongated connection member.

The look similarly has another armed extension 56 which may be directly operably connected by an elongated connection member 109 to a remote lock 110. The preferred construction of the remote lock 110 is as shown in Figure 3, the other remote lock preferably also being of similar construction.

As shown in Figure 3, the remote lock 110 has a casing 111 having a forward wall 1,12 in which there is an aperture 113 through :vhich bolt 121 is displaceable between extended and retracted positions. Within the side of the bolt 121 is a recess 130 within which VL:*OPEtiH'I0ta194W sill; DIM -4a pin 131 protruding from the end of an angularly displaceable arm 133 locates and by which the bolt 121 is caused to displace. The arm 133 is supported below the bolt 121 on a pin protruding from the casing 111. The arm 133 is integral with a second arm 136 angularly inclined relative thereto and the end of which is connected to the elongated member 109. A spring 137 outwardly biases the bolt 121. To effect deadlocking of bolt 121 the recess 130 is comprised of a first portion 140 (Figure 4) which is substantially vertical and is joined to an angled second portion 141 which, when the bolt 121 is fully extended, is tangential to the path of movement of the pin 131 as shown in Figure 4. After moving the bolt 121 to the fully extended position the pin 131 moves into the second portion of the recess to deadlock the bolt 121, When .ile bolt 121 Xs moved to a fully retracted position the pin 131 moves into a third portion 142 of the slot in the bolt 121, Figure 4, to prevent the bolt 121 from displacing uder bias 137 towards the extended position. Movement of drive arm outwardly causes the member 109 to be pushed to move the pin 131 out of the third portion 142 to permit spring 137 to urge the bolt 121 to a fully displaced position. If the remote bolt 121 meets an obstruction while displacing to the extended position then the drive arm 40 would be restrained and this, through engagement with the main bolt 20 as described above, would restrict the main bolt 20 from displacing to the fully extended position thereby preventing the deadlocking slide 80 from being advanced to the deadlocking position, It can be seen if the bolt 121 of remote lock 110 is held partly retracted then the arm 56 is restrained by elongated member 109 and drive arm 40 is restrained thereby restraining the bolt 20, In this way interlocking between the lock of the main and remote locks occurs since the main lock bolt cannot be deadlocked until the remote lock bolt is fully displaced or substantially fully displaced according to the specific lock design. Similarly interlocking occurs with the other remote lock, Auxiliary bolt 70 may have a leading portion comprising edges which are curved or bevelled or otherwise contoured on both sides as shown in Figure 5 to assist inward S ,"30 displacement of the bolt through strike plate 1 engagement. As is common, the strike plate P 1Jl4100i1ts't71I9'W sr1 wiN has an aperture in which the bolt 20 may engage and a landing beside the aperture with which the auxiliary bolt engages and by which it is held depressed. The strike plate also has a leading angled portion 2 to assist inward displacement of the bolts during latching. The auxiliary bolt would have a leading portion similarly curved on both sides to facilitate latching on both sides. By this means both left hand and right hand doors are accommodated.

Bolt 20 may have a leading portion comprising edges which are curved or bevelled on both sides as shown in Figure 5 to assist inward displacement of the bolt which may be required if the bolt is held partly extended by the detent and is required to be inwardly displaced by the strike plate. The bolt 20 also would have a leading portion similarly curved on both sides to assist engagement with the strike plate on either side, By this means both left hand and right hand doors are accommodated.

The bolt of the or each remote lock may also have a leading portion comprising edges 15 which are curved or bevelled or otherwise contoured on both sides.

Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of 20 of any other integer or group of integers.

S.

S

Claims

2. A lock according to claim 1 including a deadlocking means to restrain the first bolt from displacing from an extended position towards the retracted position. 00*. a 20 3. A lock according to any one of the above claims wherein the restraining means is operative to restrain the first bolt in a partly extended position.
4. A lock according to any one of the above claims wherein the auxiliary bolt includes oa leading portion comprising edges which are curved, bevelled or otherwise contoured on both sides. A lock according to any one of the above claims when dependent on claim 4 including latching means, said latching means comprising a strike plate and a leading portion of the first bolt comprising edges which are curved, bevelled or otherwise contoured on both sides. I I i Lj~II~,I r.7ni~ ~.lN 'Ii. ~1 ~2Vfl -7-
6. A lock according to any one of the above claims wherein the first bolt actuating means comprises the lever, a shaft, a cylindrical cam with an integral disc supporting a pinned protrusion and having an axial aperture, the pivotally displaceable drive arm being supported with free movement on the cylindrical cam, wherein the lever is coupled to the cam by the shaft and the pivotally displaceable drive arm is engageable by the pinned protrusion whereby an extended bolt may be retracted by angular displacement of the lever.
7. A multipoint lock comprising a main lock according to any one of the above claims, and at least one remote lock comprising a second casing, and a second bolt supported within the second casing and displaceable between an extended position protruding from the second casing and a retracted position substantially within the second casing.
8. A multipoint lock according to claim 7 including a second bolt actuating means S comprising an elongated transmission member operably interconnecting the pivotally displaceable drive arm and remote lock. *9*
9. A multipoint lock according to claim 8 wherein the pivotally displaceable drive arm has an extension which is operably coupled to the elongated transmission member. •09 20 10. A multipoint lock according to clain 8 or claim 9 wherein the second bolt actuating means comprises an angularly displaceable rocker supported in the second casing having two extensions one of which supports a pin which locates in a slot in the side of the second bolt and the other of which is engageable by the elongated transmission member. 99 9
11. A multipoint lock according to any one of the above claims when dependent on claim wherein the slot comprises a first portion which is substantially vertical and has a cross sectional width which is sufficient to accommodate the pin without excessive clearance.
12. A multipoint lock according to any of the above claims when dependent on claim s- 30 wherein the slot comprises a first portion and a second portion joined at one end to the first NT O iil f w e t 1, )ll I' ;.ll lS rIll; 31'; l! .8- portion and angularly inclined relative to the first portion, said second portion when the bolt is extended being disposed at an angle which is substantially tangentia. t 4 the locus of movement of the pin.
13. A multipoint lock according to any one of the above clain i -,;.,ndent on claim wherein the slot comprises a first portion and a third portion joii.. ul end to the first portion and angularly inclined relative to the first portion, said third portion when the bolt is substantially fully retracted being disposed at an angle which is substantially ranger tial to the locus of movement of the pin,
14. A multipoint lock according to any of the above claims when dependent on claim 8 wherein the second bolt actuating means comprises the elongated transmission member and lever, said second bolt being actuable by lever rotation. S 15 15. A multipoint lock according to claim 14 wherein upward lever rotation drives the elongated transmission member to drive the first and second bolts towards their extended positions.
16. A multipoint lock according to any one of the above claims when dependent on claim 20 8 including interlocking means whereby the first bolt cannot be deadlocked unless the second bolt is in the extended position. 8
17. A lock substantially as described herein with reference to and as illustrated in the accompanying drawings. I I- It U111401sir I TV1
18. A multipoint lock substantially as described herein with, referene to and as illustrated in the accompanying drawings. DATED this 23rd day of February, 1998 JOHN RUSSELL WATTS By his Patent Attorneys: DAVIES COLLISON CAVE 4 0 ABSTRACT A lock comprising a first casing, a first bolt slidably supported within the first casing and displaceable beween an extended position where it protrudes from the first casing and a retracted position where it is substantially within the first casing, a first bolt actuating means to cause the first bolt to displace towards the retracted position comprising an external angularly displaceable lever and a pivotally displaceable drive arm engageable with the first bolt said pivotally displaceable drive arm being operably engageable with the external lever, detent means to restrain the first bolt from displacing towards thq extended position said detent means comprising an outwardly biassed displaceable auxiliary bolt and the pivotally displaceable drive arm and trigger means to release the detent to allow the pivotally displaceable drive arm and first bolt to displace towards the extended position said trigger means comprising displacement of the auxiliary bolt away from the pivotally displaceable drive arm as a result of inward auxiliary bolt displacement. 0 S S* 6* S S 3 S S I eGeO e1 eeelu W