AU750812B2

AU750812B2 - Improvements in locks

Info

Publication number: AU750812B2
Application number: AU48861/00A
Authority: AU
Inventors: John Russell Watts
Original assignee: Yarra Ridge Pty Ltd
Current assignee: Austral Lock Industries Pty Ltd
Priority date: 1992-10-22
Filing date: 2000-07-27
Publication date: 2002-07-25
Anticipated expiration: 2013-10-22
Also published as: AU4886100A

Description

P/00/0 11 Regulation 3.2

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT

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S S S S Invention title: Improvements in Locks

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S S The following statement is a full description of this invention, including the best method of performing it known to us: clrmM0l111038883v1 304650245 5.11.2001 Field of the invention The invention relates to locks and locking and operating mechanisms for door locks.

Summary of the Invention According to the invention there is a lock including a casing, an angularly displaceable first cam, engageable means, an engaging member displaceable between a disengaged position and an engageable position in which it is engageable with the engageable means, a displaceable deadlocking member displaceable into a deadlocking configuration in which the deadlocking member and engaging member cooperate to deadlock the engaging member whereby to restrain the engaging member from being displaced from the engageable position, a locking member operably coupled to the deadlocking member whereby to enable the deadlocking member to be displaced by the locking member, the lock being controlled by the angular disposition of the first cam wherein the first cam within a first range of angular disposition is operably coupled to the deadlocking member such that either one is displaceable by displacement of the other and wherein the deadlocking member is displaceable by the first cam and by the locking member, the first cam being further displaceable within a second range of angular disposition while the deadlocking member remains substantially unmoved restrained by S• °the first cam, said second range of angular disposition corresponding with a deadlocked engaging member.

Preferably, the first cam is operably connected to a key operable cylinder.

According to the invention there is a lock including a casing, an angularly displaceable first cam operably connected to a key operable cylinder, an engaging member displaceable between a retracted position and a fully extended position where it protrudes from the casing, a displaceable deadlocking member comprising a deadlocking slide displaceable into a deadlocking configuration in which the deadlocking slide and engaging member cooperate to deadlock the engaging member whereby to restrain the engaging member from being displaced from the fully extended position, a locking member operably coupled to the deadlocking slide whereby to enable the deadlocking slide to be displaced by displacement of the locking member, the lock being controlled by the angular disposition of the first cam wherein the R first cam within a first range of angular disposition is operably coupled to the deadlocking clrmMO111133051vi 304650245 slide such that either one is displaceable by displacement of the other and wherein the deadlocking slide is displaceable by the first cam and by the locking member, the first cam being further displaceable within a second range of angular disposition while the deadlocking slide remains substantially unmoved restrained by the first cam, said second range of angular disposition corresponding with a deadlocked engaging member.

Preferably, the first cam within the second, range of angular disposition corresponds with the cam contacting the deadlocking member at a locking point of contact, said locking point of contact being defined by a vector normal to the surface of the deadlocking member that passes substantially through the axis of rotation of the first cam.

Preferably, the deadlocking member comprises a deadlocking slide that includes a drive recess defined by a first and a second drive shoulder and the first cam includes a cam arm engageable within the drive recess, and referably, the cam arm is between the drive shoulders when the first cam is within the first range of angular disposition, and preferably, the first drive shoulder is connected to an exit shoulder defined in-part by an exit surface defined by a vector normal to the surface that passes substantially through the axis of rotation of the first cam enabling the cam arm to slide over the surface while the deadlocking slide remains substantially undisplaced in a deadlocking configuration, said sliding corresponding to angular displacement of the first cam within the second range of angular disposition.

Preferably, the lock includes biasing means to urge the first cam from displacing from the second range of angular disposition.

Preferably, the deadlocking member comprises a rectilinearly displaceable deadlocking slide supported within the casing adjacent a casing wall.

Preferably, the locking member comprises a locking arm supported by the casing for pivotal movement.

S"Preferably, the lock includes engageable means and stop means to restrain the engaging S"member from being displaced to engage the engageable means unless the engaging member and engageable means are adjacently disposed, said stop means including an outwardly biased and inwardly displaceable plunger-like member supported within the casing, and preferably, the plunger-like member comprises an auxiliary bolt.

Preferably, the engageable means comprises a strike plate, and preferably the engaging member comprises an outwardly biased latch bolt supported within the casing.

In some independent forms of the invention the lock includes multiple engaging members supported in a casing each said engaging member being displaceable between a retracted position and a fully extended position where each protrudes from its respective casing and preferably, each engaging member is defined in-part by a locked configuration in which it is separately restrained in the fully extended position.

Description of the Drawings 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 partial schematic cut away side elevation of a lock showing a latch bolt retained in a partly extended position by an auxiliary bolt, and an operative end portion of a first cam between the drive shoulders of a deadlocking slide that is in a position where it does not restrain the latch bolt, Figure 2 is a partial schematic cut away side elevation of the lock of Fig 1, showing the latch bolt in the fully extended position and within the strike plate aperture, the deadlocking slide and latch bolt in the deadlocked configuration and the first cam operative end portion on the surface of the exit shoulder,

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Figure 3 is a partial schematic cut away side elevation of a lock showing the deadlocking slide operably connected to remote bolts, i 15 Figure 4 is a partial schematic enlargement of Figure 3.

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0o Description of the Preferred Embodiments In preferred embodiments the invention includes: an engageable member comprising a strike plate having an engageable aperture, a boxlike casing 1, a displaceable engaging member comprising a latch bolt 2, a deadlocking member comprising a deadlocking slide 4, an angularly displaceable first cam (the first cam comprising an angularly displaceable cam having an extension comprising an arm 7, said first cam in preferred embodiments comprising part of a key operable cylinder) and a displaceable locking member comprising an angularly displaceable locking arm 8 supported within the casing and operably coupled to the deadlocking slide.

The deadlocking slide comprises a blade-like member with a leading end 28 that is engageable with the latch bolt to deadlock the latch bolt, said deadlocking slide having a side recess' 29 engaged with a sideways protruding pin 30 protruding from the angularly displaceable locking arm 8, said pin being disposed away from the pivotal axis of the locking arm to operably interconnect the locking arm 8 and deadlocking slide.

The deadlocking slide also includes a drive recess 31 engageable with an operative portion of the first cam, (the first cam in some preferred embodiments comprising part of a key operable cylinder), the drive recess 31 being defined in-part by opposed drive shoulders 32 and 33 respectively, and as can be seen from examining the figures, the operative portion of the first cam comprising and end portion of the cam arm 7 disposed from the first cam pivotal axis and defined in-part by an arcular surface 35. Within a first range of first cam angular disposition the first cam and the deadlocking slide are operably coupled whereby the arm 7 is angularly displaceable by displacement of the deadlocking slide and the deadlocking slide is displaceable by angular displacement of the arm 7; and further more, while the first cam is within the first range, the deadlocking slide is **displaceable by angular displacement of either the locking arm 8 or the first cam; i.e. the deadlocking slide can be actuated displaced between the undisplaced position and the deadlocking position corresponding to a deadlocked engaging member) by the locking arm 8 and by the first cam.

It will be appreciated by examining the embodiment shown in the figures that in these embodiments when the first cam is in the first range of angular disposition the operative portion remains between the drive shoulders.

From the end of the first range of angular disposition of the first cam corresponding to the deadlocking slide being in the deadlocking position, the first cam can be further displaced within a second range of first cam angular disposition while the deadlocking slide remains substantially unmoved in the deadlocking, the operable coupling between the deadlocking slide and first cam ceasing. The deadlocking slide is then unable to be displaced to displace the said first cam so that in effect, displacement of the operative end portion into this second range of angular disposition secures the deadlocking slide in the deadlocking position. It will also be appreciated that because the locking member is operably coupled to the deadlocking slide that, when the deadlocking slide is secured by the first cam, that the deadlocking slide cannot be actuated by the locking arm.

Drive shoulder 33 is connected to an exit shoulder 34 that is configured such that when the deadlocking slide has been moved to the deadlocking position, the surface of the exit shoulder 34 lies substantially orthogonal to the pivotal axis of the first cam and arm 7 so that the leading edge 35 of the cam arm 7 the outer arcular surface of the operative portion), can be displaced to slide on the surface 34 without substantially displacing the deadlocking slide, this displacement of the operative portion over the surface of the exit shoulder corresponding to displacement of the first cam within the second range of first cam angular disposition. It will be appreciated that when the first cam is so disposed attempted displacement of the deadlocking slide gives rise to a force on the first cam that is defined by a vector which passes through the first cam pivotal axis and which therefore eecannot give rise to a moment that would urge the first cam to rotate.

It will be appreciated by examining the embodiment shown in the figures, that in these embodiments the deadlocking slide displaces in a substantially rectilinearly manner and into and of engagement with the latch bolt.

25 This arrangement finds application in a lock which also includes a pivotally supported rocker member 5 biased towards the angularly displaceable first cam, a displaceable plunger-like member comprising an auxiliary bolt 3 positioned adjacent the latch bolt, a key operable cylinder 6, and an operating cam 9 operably connected to an external lever and by which the latch bolt can be made to retract.

It will be appreciated by examining the embodiment shown in the figures, that in these embodiments the operating cam, first cam and locking arm have parallel pivotal axii which are co-linearly disposed and displaced rearwardly of the deadlocking slide as shown in Fig 1 and 2.

8 In normal use, operation of the external operating lever causes the operating cam 9 to rotate to cause an armed extension 10 of the operating cam 9 to engage a rearward shoulder 11 of the latch bolt to draw it rearwardly to thereby causing the latch bolt to be displaced inwardly. The latch bolt in normal use would be made to displace inwardly from a fully extended position to a free position where it has disengaged the strike plate 57 shown in Fig 2, at which point, the door in which the lock is fitted can be opened.

In normal usage, immediately after the door is opened, the lever would be angularly displaced by hand to an undisplaced position and the hand would then be removed. As the lever so displaces the operating cam 9 would correspondingly angularly displace towards an undisplaced position. As the operating cam rotates towards the undisplaced position the latch bolt would displace correspondingly under biasing means towards the fully extended position. The latch bolt would displace outwardly until it is engaged by the fully extended auxiliary bolt, at which point the operating cam would continue to displace while the latch bolt remains retained at the position of engagement with the auxiliary bolt in a pre-latching, partly extended configuration. In normal usage, this configuration of the .:..lock occurs between the opening and closing of a door after the operating lever has been released by hand.

The action of closing the door causes the auxiliary bolt and the latch bolt to be inwardly displaced by sliding up the strike plate. When the latch bolt attains the position over the aperture in the strike plate it is displaced under the action of biasing means to a fully extended position while the auxiliary bolt is maintained displaced from the fully extended position by the strike plate. The latch bolt, (previously restrained from displacing outwardly by the auxiliary bolt), is able to displace outwardly because. the displacement 25 of the auxiliary bolt from the fully extended position causes the auxiliary bolt to become unengageable by the latch bolt. When the latch bolt is in the fully extended position shown in Fig 2, the deadlocking slide can be displaced from the undisplaced position shown in Fig 1 to the deadlocking position shown in Fig 2, a position where a leading portion of the deadlocking slide is disposed behind a shoulder 12 of the latch bolt to thereby restrain the latch bolt from being displaced inwardly. The deadlocking slide can be displaced by rotation of the first cam.

In some embodiments the first cam is operably connected to small external hand operable lever to be angularly displaceable by the small lever; in other embodiments the 0':

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first cam is operably connected to a key operable cylinder to be angularly displaceable by the cylinder.

In more detail, the lock comprises a rectangular box-like casing 1 having a front wall 14 in which there is an aperture 15 through which the latch bolt has passage and aperture 16 through which the auxiliary bolt protrudes. At the upper and lower end of the casing, the front wall is integrally joined to elongated extensions 17 by which the lock casing is secured into a door. The casing also includes substantially cylindrical apertures in the sides to support the shaft-like portions of the angularly displaceable members supported in the casing and to accommodate the locking cylinder 6 and spigots 58 with which external lever assemblies are secured to the door. There is also an aperture of rectangular cross-section in the operating cam to accommodate a rectangular shaft operably coupling the external levers situated one on each side of the door to the operating cam 9. The operating cam 9 has a substantially cylindrical shape with an extension comprising the arm It will be appreciated by examining the embodiment shown in the figures that in these embodiments there is also an aperture of rectangular cross-section in the cylindrical boss i xrportion of the locking arm 8 to accommodate a rectangular shaft that is connected to an external lever to the locking arm 8.

The latch bolt 2 has a substantially box-shaped profile with a leading end portion having each side curved, chamfered, ramped or otherwise profiled to facilitate inward displacement by strike plate engagement on either side. This latch bolt has rearwardly two legs, one of which has a rear shoulder 11 that is engageable by the arm 10 of the operating cam. The arm 10 is located in a concave recess that exists between the rear shoulder 11 and the latch bolt leading end. A spring 18 biases the latch bolt outwardly 25 towards the fully extended position.

latch bolt also has a shoulder 12 that is disposed rearwardly of the leading end portion that is engageable with the deadlocking slide 4 to restrain the latch bolt in the o fully extended position as stated above, said engagement being effected by displacement of the deadlocking slide towards the latch bolt. In the deadlocked configuration of the lock, a leading end portion of the deadlocking slide lies behind the latch bolt leading end portion adjacent the shoulder 12 and beside the lower rearwardly projecting leg, thereby restraining the latch bolt from inwardly displacing. Adjacent the auxiliary bolt, the latch bolt has at least one ramped shoulder 19 that projects into the locus of displacement of the rearward shoulder 20 of the auxiliary bolt.

The auxiliary bolt comprises a substantially cylindrical portion 21 that is supported in the aperture in the casing front wall and has at least one rearwardly disposed protruding substantially annular shoulder 20. This auxiliary bolt has a leading portion that may be curved ramped or chamfered on one or both sides but is preferably chamfered on one side only.

Preferably the auxiliary bolt is angled on one side only. So that the lock may be used on both the left hand and right hand hinged doors there is means for reversing the auxiliary bolt so that the inclined leading portion 13 can be in the direction of the door closing.

This is achieved as described below. Rearwardly the auxiliary bolt comprises a shaft of rectangular cross section as shown in cross-section CC, Fig 2. This shaft is supported for longitudinal movement and limited vertical movement by the forked extension 22, Fig 2 of the lock casing. Within the normal range of movement of the auxiliary bolt, the shaft of rectangular cross section is supported by the forked extension but between the'shaft portion of rectangular cross-section and the leading portion of the auxiliary bolt is a portion of circular cross section 23, cross-section BB Fig 2. Depression of the auxiliary bolt beyond the normal range causes this portion 23 to move adjacent the forked support.

When this portion is supported by the forked extension it is possible to rotate the i auxiliary bolt so that the inclined portion can be disposed in the direction of door closing to facilitate latching. The auxiliary bolt can be so depressed when the spigot 58 is not within its fitting aperture behind the auxiliary bolt. The auxiliary bolt can be depressed beyond its normal range to be rotated prior to fitting of the external levers assemblies but it cannot be so depressed when the lock is completely installed because the spigot 58 lies in the path of travel of shoulder.20 to limit its movement.

On the side of the forked extension, disposed towards that side of the auxiliary bolt that is furthest from the latch bolt, is an inclined surface 24 that is engageable by the auxiliary bolt shoulder 20. When the auxiliary bolt outwardly displaces under the action of the spring 25, (from the inwardly displaced position it is displaced to by the strike plate), the shoulder 20 on contacting the inclined surface, slides up the inclined surface 24 to be f displaced towards the latch bolt. In this way the shoulder 20 is displaced into a position ft ft f 30 in which a portion of it protrudes into the path of movement of the ramped shoulder 19 of the latch bolt thereby to be engageable by the latch bolt protrusion 19.

Commencing rearwardly of the casing and extending towards the front of the casing is a casing finned extension 26 that has a ramped leading edge 27 that is disposed substantially rearwardly of the shoulder 20 when the auxiliary bolt is fully extended as shown in Fig 1, said ramped leading edge 27 being engageable by the shoulder 20 on the auxiliary bolt. When the auxiliary bolt is inwardly displaced from the fully extended position the shoulder 20 contacts this ramped leading edge 27 and slides up the ramp to be displaced away from the latch bolt to displace the engaging shoulder 20 out of the locus of displacement of the ramped shoulder 19 of the latch bolt.

The pivotally supported rocker 5 is a laminar-like member having a profiled edge disposed towards the first cam that is situated beside the deadlocking slide within the casing. This member has a raised portion 36 that, when the first cam has displaced into its second range, engages with the arm 7 to bias the first cam away from its first range of angular disposition thereby acting to urge the first cam to remain within its second range of angular disposition. The rocker is biased by spring 40 towards the first cam.

The invention also provides a multi-point lock having multiple deadlocking bolts, said multi-point lock including a drive mechanism by which remote locks are actuated. The drive mechanism 41 includes a pair of counteracting slides 42 and 43 supported within an auxiliary casing 44, said auxiliary casing being supported relative to the casing. Each slide has an inwardly projecting pin 45, 46 which engages in one of a pair of opposite substantially radially disposed slots 47, 48 in a disc-like member supported in the auxiliary casing 44 between the slides for angular displacement about a pivotal axis disposed between the slots and between the slides -displacement of one slide in one direction causes the disc member to rotate and drive the other slide in the opposite direction.

The deadlocking member 4 is adapted to engage one of the slides of this drive mechanism by being of extended length and having two protruding pins that engage in two corresponding recesses within one of the slides of the drive mechanism. Displacement of the deadlocking slide causes one of the slides of the drive mechanism to move in one direction and the other slide to move in the other direction. Remote locks are positioned 25 one above and one below the drive mechanism. These locks are operably coupled by bars 49 and 50 and configured so that actuation of the deadlocking slide to the deadlocking position causes the bars to drive the bolts of the remote locks to their fully extended and deadlocked position.

Each remote lock 51 comprises a remote casing 52 that in usage is fixed relative to the casing and which supports a displaceable remote bolt 53. This remote bolt is operated by an angularly displaceable rocker 54 supported by a pin joint comprising a protruding pin of the remote casing defined by an axis of rotation, said rocker having a substantially rearwardly projecting first arm with a sideways protruding first pin 55 disposed from the R44/ aid axis which is engaged in a recess 56 in the end of a bar. The rocker has a substantially vertically projecting second arm that has a sideways protruding second pin disposed from the said axis which engages in a profiled slot in the side of the remote bolt 53 in slide-follower relationship.

In usage, the pivotally supported rocker operates within two ranges of movement. In the first range the second pin slides within a substantially vertical portion of the slot 54 to drive the remote bolt between the fully extended and retracted positions while in the second range of movement displacement, corresponding to a fully extended remote bolt, the second pin is within an angled portion of the slot having side walls are that are substantially orthogonal to the pivotal axis of the rocker member so that the pin can slide within this portion of the channel without causing the remote bolt to displace whereby to deadlock the remote bolt in the fully extended position. Displacement of the deadlocking slide to the deadlocking position simultaneously causes the latch bolt to become deadlocked and the remote locks to displace to the fully extended position and to become deadlocked.

Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise" 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, and the positional prepositions S.such as up, down, and rear which are used to assist in description of the preferred 20 embodiments, have in general no absolute significance.

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Claims

1. A lock including a casing, an angularly displaceable first cam, engageable means, an engaging member displaceable between a disengaged position and an engageable position in which it is engageable with the engageable means, a displaceable deadlocking member displaceable into a deadlocking configuration in which the deadlocking member and engaging member cooperate to deadlock the engaging member whereby to restrain the engaging member from being displaced from the engageable position, a locking member operably coupled to the deadlocking member whereby to enable the deadlocking member to be displaced by the locking member, the lock being controlled by the angular disposition of the first cam wherein the first cam within a first range of angular, disposition is operably coupled to the deadlocking member such that either one is displaceable by displacement of the other and wherein the deadlocking member is displaceable by the first cam and by the locking member, the first cam being further displaceable within a second range of angular disposition while the deadlocking member remains substantially unmoved restrained by the first cam, said second range of angular disposition corresponding with a deadlocked engaging member.

2. A lock according to Claim 1, wherein the first cam is operably connected to a key operable cylinder.

3. A lock including a casing, an angularly displaceable first cam operably connected to a key operable cylinder, an engaging member displaceable between a retracted position and a fully extended position where it protrudes from the casing, a displaceable S•deadlocking member comprising a deadlocking slide displaceable into a deadlocking •configuration in which the ••oo 0. i deadlocking slide and engaging member cooperate to deadlock the engaging member whereby to restrain the engaging member from being displaced from the fully extended position, a locking member operably coupled to the deadlocking slide whereby to enable the deadlocking slide to be displaced by displacement of the locking member, the lock being controlled by the angular disposition of the first cam wherein the Sfirst cam within a first range of angular disposition is operably coupled to the deadlocking slide such that either one is displaceable by displacement of the other and wherein the deadlocking slide is displaceable by the first cam and by the locking member, the first cam being further displaceable within a second range of angular disposition while the deadlocking slide remains substantially unmoved restrained by the first cam, said second range of angular disposition corresponding with a deadlocked engaging member.

4. A lock according to any one of the above claims, wherein the first cam within the second range of angular disposition corresponds with the cam contacting the deadlocking member at a locking point of contact, said locking point of contact being defined by a vector normal to the surface of the deadlocking member that passes substantially through the axis of rotation of the first cam.

A lock according to any one of the above claims, wherein the deadlocking member comprises a deadlocking slide that includes a drive recess defined by a first and a second drive shoulder and the first cam includes a cam arm engageable within the drive recess.

6. A lock according to Claim 5, wherein the cam arm is between the drive shoulders when the first cam is within the first range of angular disposition.

7. A lock according to Claim 5 or Claim 6, wherein the first drive shoulder is connected to an exit shoulder defined in-part by an exit surface defined by a vector normal to the surface that passes substantially through the axis of rotation of the first cam enabling the cam arm to slide over the surface while the deadlocking slide remains substantially undisplaced in a deadlocking configuration, said sliding corresponding to angular displacement of the first cam within the second range of angular disposition.

8. A lock according to any one of the above claims, including biasing means to urge the first cam from displacing from the second range of angular disposition. ooo•

9. A lock according to any one of the above claims, wherein the deadlocking member comprises a rectilinearly displaceable deadlocking slide supported within the casing adjacent a casing wall.

A lock according to any one of the above claims, wherein the locking member comprises a locking arm supported by the casing for pivotal movement.

11. A lock according to any one of the above claims, including engageable means and stop means to restrain the engaging member from being displaced to engage the RA ngageable means unless the engaging member and engageable means are adjacendy disposed, said stop means including an outwardly biased and inwardly displaceable plunger-like member supported within the casing.

12. A lock according to claim 10, wherein the plunger-like member comprises an auxiliary bolt.

13. A lock according to Claim 11, wherein the engageable means comprises a strike plate.

14. A lock according to any one of the above claims, wherein the engaging member comprises an outwardly biased latch bolt supported within the casing.

A lock according to any one of the above claims, including multiple engaging members supported in a casing each said engaging member being displaceable between a retracted position and a fully extended position where each protrudes from its respective casing.

16. A lock according to Claim 15, wherein each engaging member is defined in-part by a locked configuration in which it is separately restrained in the fully extended position. Rd Yarra Ridge Pty Ltd 22 May 2002 g** S* *e 0