AU604092B2 - A deadlocking lock - Google Patents

Description

I -1- 604092 This document contains the amendments made under Section 49 and is correct for priating.

COMMONWEALTH OF AUSTRALIA The Patents Act 1952-1969 Name of Applicant: Address of Applicant: 0a 4 o e I 0 0 0 00 0 0 a 9 0 00 o so 0o o I 0 0 WHITCO PTY. LTD.

450 Sherwood Road, Sherwood Queensland 4075 Actual Inventor: Address for Service: G.R. CULLEN COMPANY PATENT TRADE MARK ATTORNEYS DALGETY HOUSE 79 EAGLE STREET BRISBANE QLD 4000

AUSTRALIA

COMPLETE SPECIFICATION FOR THE INVENTION ENTITLED: A DEADLOCKING LOCK The following statement is a full description of the invention including the best method of performing it known to us: i 2 This invention relates to locks. In particular, the invention relates to a deadlocking lock.

Locks for security doors or the like have a tongue that in use slides past a striker plate in a door jamb to effect latching and locking of the door. The tongue usually has an inclined or contoured surface that allows the tongue to slide past the striker plate. Since such shaped tongues only allowed the door with such a lock to be either left or right hand closing it was initially the practice to make locks for both left and right hand closing doors. This was oundesirable as a door manufacturer would have to carry two o" separate lines of stock. An attempt at overcoming this o difficulty was to provide locks with reversible tongues. A door manufacturer could then order from the lock manufacturer a required number of locks fitted with reversible tongues and which were either left or right hand locking and the tongue could be reversed as the need arose.

Whilst reversible locks did provide a measure of relief from the initial problem they required an additional operation to be performed by the lock manufacturer.

Australian Patent Specification 54925/86 was an attempt at providing a lock which was suitable for both left and right hand closing doors but which did not require the tongue to be reversed. The lock the subject of this specification had a tongue which was similarly curved on both sides so that, in use, either side could slide past the 3 striker plate. The lock was such that the tongue was fully retractable into the lock body and normally extended a short distance out from the body into a latched position and could be driven into a deadlocked position by a locking slide in which position the tongue extended a substantial distance out from the body.

One difficulty with the lock of specification 54925/86 was that in the latched position the tongue only extended a short distance out from the body. In the case where the door was ill fitting and a gap existed between the c0 o door jamb and the door and hence the striker plate and the lock, it was easily possible for the door to be forced open either by a strong gust of wind or by someone leaning on the door.

It is an object of the invention to provide a lock which at least minimises some of the disadvantages referred o 44 to above.

According to an aspect of the invention there is provided a lock having a lock body, a main latch tongue normally biased to a first position where it extends a short distance from the body and movable between the first position .4 4 and a second position in which it extends a substantial distance from the body and in which it is either latched or in which it may be deadlocked, an auxiliary latch tongue normally biased to extend a short distance from the body and in which it may engage the main tongue to prevent the main 4 tongue from moving to its second position and movable out of engagement with the main tongue, a deadlocking member movable between a first position where the lock is undeadlocked and -a second deadlocked position in which it engages the main tongue to prevent the main tongue being moved from the main tongue second position, said tongues have nose portions which are correspondingly tapered, bevelled or curved on both sides thereof.

there is provided a lock having a lock body 'a latc ongue normally biased to a first position where it ext ds from the lock body, said tongue having a deadlockin/ portion, the lock further having a deadlocking me er movable between a deadlocked position cooperatin with the deadlocking portion and an undeadlocked po tion out of cooperation with the deadlocking portio nd clearance being provided between the deadlocking tion and the deadlocking member to enable the tongue slide relative to the body whilst remaining in the It is preferred that both tongues have bevelled nose portions although curved portions may be present. In this way, when the tongues hit a striker plate they may ramp over it in the usual way in both left and right hand operation The tongues are engageable with each other whereby the auxiliary tongue when engaged with the main tongue l_ prevents the main tongue from moving to its fully extended position. The auxiliary tongue may have a projection and the main tongue may have a co-operating projection or recess.

Alternatively, the auxiliary tongue may have a recess and the main tongue may have a co-operating projection. It is preferred that the auxiliary tongue have a projection and the main tongue have a recess. In one embodiment the projection is a hooked projection and the recess forms a shoulder O..o against which the hooked projection may abut.

o 10 The lock has a deadlocking member. The deadlocking Q member may comprise a slide. The slide may be guided by the 00 0 0 body for movement into and out of engagement with the main 000000 o 0 tongue. The slide is cooperable with a deadlocking portion provided on the main tongue and clearance is present between o 15 the slide and deadlocking portion. Alternatively, the slide 0 0 04 may locate behind the main tongue to prevent it being ooo withdrawn. In yet another embodiment the slide may abut against a shoulder formed on the main tongue. It is oo, preferred that the deadlocking portion on the main tongue be 0 0 20 provided by a recess in the tongue. The recess may present two spaced shoulders between which the slide may locate. The clearance is provided in this embodiment by having the spacing between the shoulders greater than the width of the slide. The slide may have a recess providing two spaced shoulders against which a cam member of a cylinder lock may locate.

I The lock may include a deadlocking latch for preventing movement of the deadlocking slide and hence inhibiting movement of the slide from its deadlocking position. The deadlocking latch may comprise a le7er movable between a position where movement of the slide is permitted to a position where movement is prevented. Preferably the latch is biased towards the second of the two positions mentioned. The latch engages the slide to prevent it from moving out of deadlocking engagement with the main tongue.

0 To this end both the slide and the latch have shoulders which may engage. The latch is mounted within the body and is preferably pivotally mounted.

The lock may include an operating lever for moving the main tongue against means biasing it to its extended position. The lever may be mounted relative to a spindle extending through the lock.

The lock may include a key operable cylinder lock operable to move the slide between the deadlocked and undeadlocked positions. The cylinder lock may include a cam member which may engage the slide to move the slide to the deadlocked position and which may disengage the latch from the slide and then move the slide to the non-deadlocked ii position.

I The lock may include a deadlocking lever for deadlocking the lock independently of the cylinder lock. The lever may be mounted to a shaft or spindle which carries an j i _i X" 7 arm engageable with the slide. The slide may have an arm receiving portion. This portion may be a recess in the arm.

A preferred embodiment of the invention will now be described by way of example with reference to the drawings in which: Figure 1 is a perspective view of a lock according to an embodiment of the invention and part of an adjacent door jamb; Figure 2 shows the lock of the invention in its open position; er, Figure 3 shows the lock of the invention in its 0 1 latched position; and, :Figure 4 shows the lock of figures 2 and 3 in its deadlocked position.

15 As shown in figure 1 a door jamb 10 is fitted with i 2' a striker plate 11. The plate 11 has a recess 12 for receiving main tongue 20. A sealing strip 13 extends along flange 14 of the jamb The lock 15 has two face plates 16 (only one of which is visible). Opposed handles 17 are mounted to opposite ends of a spindle in a manner generally known.

Adjacent the main tongue 20 and spaced slightly therefrom where it projects from the lockbody 22 is an auxiliary tongue 21 which projects outwardly a short distance from the lock body 22. Tongues 20, 21 are correspondingly bevelled on both sides so that the lock may be used both for left and right i i it hand closing doors. Tongue 21 does not locate within recess 12 of the striker plate 11 when the door is shut but rides over the plate 11 and is pressed into the lock body 22.

Tongue 20, normally extends outwardly from the body 22 for a short distance (as shown in figure 1 and figure 2) when the door is open. On closing the door the tongue 20 is first driven into the body 22 by the striker plate 11 the tongue 21 is driven into the body to release tongue 20 to enable it to extend into recess 12 to latch the door. When the door is latched (and the lock is in the position shown in figure 2) ,the tongue 20 extends a substantial distance from the body as 4i,4 shown by broken outline 23 in figure 1.

4 t The lock has a quick deadlocking lever 24 which enables the lock to be deadlocked and undeadlocked without a key. A locking cylinder 25 projects from the plate 16 and is key operable to deadlock or undeadlock the lock.

As shown in figures 2 to 4 the lock body 22 has a back face 30 and a front face which has been removed to reveal the interior of the lock. The body has opposed sides 31, 32 and top and bottom sides 33, 34. Side 31 has flanges which facilitate fixing of the lock to a door.

The tongue 21 has a hooked projection 38 which engages a shoulder 39 formed by a recess 40 in the main tongue 20. Tongue 21 has a rearward angular projection 41 which co-operates with ramped abutment 42 within the body 22.

The tongues 20, 21 are biased to extend outwardly of the body

I

by springs 43, 44 respectively.

Tongue 21 has a limit stop 45 which may abut against an inner surface of side 31 of the body to ensure that the tongue 21 does not project from the body 22 for a distance greater than that of figure 2. The tongue 21 is movable, when the door is closed by action against the striker from the position of figure 2 to a position substantially within the body 22 shown in figures 3 and 4.

This movement causes angular projection 41 to ride over the inclined surface of ramped abutment 42 and releases projection 38 from the shoulder 39 and the tongue 20 is then 1 moved to the latched position shown in figure 3 where it projects a substantial distance from the body. This movement is caused by spring 43.

The main tongue has a pin 50 extending outwardly i therefrom. Spring 43 acts against the pin 50 to bias the tongue towards an extended position. Operating lever 51 is mounted to the lock spindle (not shown) which extends through spindle aperture 52. Operation of handles 17 enables the tongue 20 to be withdrawn into the body 22 from either of the 4 positions of figures 2 or 3. Lever 51 has an end portion 52a which engages the pin 50. The tongue 20 is movable relative to the body 22 and guided during its movement by guide slots 53. The side of the tongue 20 not visible may have projections which locate in slots 53. The tongue 20 has a deadlocking recess 54 the purpose of which will be described L .I t 9 ii 'I later.

A deadlocking slide 60 is slidably received within the body 22 and is slidably movable between an undeadlocked position (figure 2 or 3) and a deadlocked position (figure The slide 60 is guided by spaced abutments 61, 62, 62a, shoulder 63 and the inner face of side 31. The slide carries a spring located locating ball 64 which selectively locates in one of two locating depressions formed in the front face of the body 22.

The slide has a cut out 65 within which a deadlocking arm 66 is received. Arm 66 is mounted about a spindle 67. Deadlocking lever 24 (figure 1) is mounted to spindle 67 and movement of lever 24 enables arm 66 to be moved between the positions of figures 2 and 4.

A deadlocking latch 70 is located within the body 22 and is pivotally mounted to the body by pin 71. Latch is biased by spring 72 and has a shoulder 73 which in the deadlocked position of figure 4 abuts against upper shoulder 74 of slide Lock cylinder 25 has a cam projection 75 which may pivot latch 70 against the action of spring 72. Cam projection 75 may act against upper shoulder 74 to lift the deadlocking slide into the deadlock position of figure 4 and act against lower shoulder 76 to return the slide to its undeadlocked position.

The operation of the lock of figures 1 to 4 is a t I i 11 follows. When the door is open or ajar the lock assumes the position of figure 1 and 2 with both tongues 20, 21 projecting a short distance from the body 22. When the door is closed both tongues 20, 21 hit the striker plate 11 and are driven into the body against the action of springs 43, 44. As tongue 21 is moved into the body projection 41 rides up ramped abutment and hooked projection 38 is released from shoulder 39 and the main tongue 20 is released and moves to o 1 its fully extended position of figure 3 under the influence o04 10 of spring 43. The lock is now in its latched position. The 00o4 o lock may now be either operated by the handles 17 to rotate *lever 51 to open the door and return the lock to the state shown in figure 2 or may be deadlocked. Deadlocking, as shown in figure 4, may be achieved either by pivoting 15 deadlocking lever 24 and hence deadlocking arm 66. Arm 66 is moved from the figure 3 to the figure 4 position to deadlock the lock by having an upper end of the slide 60 locate within recess 54 to prevent or limit retraction of the tongue Should deadlocking no longer be required arm 66 may be returned to the figure 3 position to release slide 60 from recess 54 and thereby return the tongue to its latched position.

If deadlocking operation is to be achieved by operating cylinder 25 this can be done either after arm 66 has been moved to the figure 4 position or before. If done after, then the arm 66 cannot manually be returned to the 12 figure 3 position by operation of lever 24, rather a key must be used. When a key is used in cylinder 25 member 75 may be moved from the figure 3 position, against shoulder 74 to lift slide 60 and to move member 75 out of view behind cylinder 25. This movement ensures that an upper end of slide 60 is received within recess 54 and the tongue is deadlocked.

Slide 60 is prevented from movement by latch 70 and engagement of shoulders 73 and 74. To undeadlock the lock, cylinder 25 is operated to enable member 75 to depress latch 70. Continued movement of cam 75 causes the cam to abut shoulder 76 and move the side 60 back to the position of figure 3.

It will be seen that the lock of the invention ensures that the main tongue is fully extended into the latched and deadlocked positions. The two tongue- are correspondingly bevelled on both sides and may be used for both left and right hand operation because in the open position the tongues project only a short distance from the body. Since the main tongue is fully extended in both the latched an deadlocked positions unintentional opening of the door due to poor tolerances between the door and the striker carrying door jamb is eliminated.

By having clearance provided between recess 54 and slid 60, it is possible for the tongue 20 to be accommodated in a recess 12 in a door jamb where the tongue bottoms out in that recess before it reaches its full extension as shown in i 13 figures 3 and 4. This is particularly useful where the recess 12 is not formed deep enough or where it is not possible to form a recess 12 of the requisite depth in the door jamb. This clearance still enables the tongue 20 to be deadlocked by the slide o00 0 00 0 4 4 it P1 I 1

Claims (9)

1. A lock having a lock body, a main latch tongue normally biased to a first position where it extends a short distance from the body and movable between the first position and a second position in which it extends a substantial distance from the body and in which it is either latched or in which it may be deadlocked, an auxiliary latch tongue normally biased to extend a short distance from the body and eSVfQ% Cec-ac\e- t.o in -A-hicLh it m\ ay-eacpgathe main tongue to prevent the main tongue from moving to its second position and movable out of engagement with the main tongue, a deadlocking member movable between a first position where the lock is undeadlocked and a second deadlocked position in which it engages the main tongue to prevent the main tongue being moved from the main tongue second position, said tongues having nose portions which are correspondingly tapered, bevelled or curved on both sides thereof.

2. The lock of Claim 1 wherein both said tongues have bevelled nose portions so that they may be employed with a left or right hand closing door.

3. The lock of Claim 1 or 2 wherein said tongues are engageable with one another by having the main tongue provided with a recess and the auxiliary tongue is provided with a cooperating projection.

4. The lock of Claim 3 wherein said body includes a ramped portion against which an end of the auxiliary tongue may abut and relative to which the end may move when the auxiliary tongue is caused to move to its second position to thereby move out of engagement with the main tongue.

The lock of any one of Claims 1 to 4 wherein said deadlocking member comprises a deadlocking slide mounted for sliding movement relative to the body.

6. The lock of any one of Claims 1 to 5 wherein said main tongue has a recess engageable by the deadlocking a member to prevent said main tongue from being moved from its Do C e second position.

7. The lock of Claim 6 wherein the recess within the main tongue engageable by the deadlocking member is of a size providing clearance between it and the deadlocking member.

8. The lock of any one of Claims 1 to 7 including a deadlocking latch pivotally mounted to the body and biased to engage a shoulder on the deadlocking member to prevent said member being moved to its second position and a key operable cam member engageable with the deadlocking member for moving the member to its first position and movable to disengage the latch from the shoulder and move the member to its second position.

9. The lock of Claim 8 including an operating lever pivotally mounted to the body for moving the deadlocking Smember from its first to its second position independently of cam member. The lock of Claim 9 wherein said deadlocking member 16 has a recess within which an end of the lever is received. 11 a 2 h t c n^rlJlae biased to a first position where it extends from lock body, said tongue having a deadlocking por n, the lock further having a deadlocking membe ovable between a deadlocked position cooperating w the deadlocking portion and an undeadlocked posi on out of cooperation with the deadlocking portion clearance being provided between the deadlocking o ion and the deadlocking member to enable the tongue slide relative to the body whilst remaining in the I, A lock substantially as herein described with reference to the accompanying drawings. e m DATED this Twenty-second day of February, 1988. WHITCO PTY. LTD. by their Patent Attorneys G.R. CULLEN COMPANY