AU700983B2 - Improvement in pivot arm locks - Google Patents

Description

P/00/011 AUSTRALIA Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

NOTICE

1. The specification should describe the invention in full and the best method of performing it known to the applicant.

2. The specification should be typed on as many sheets of good quality A4 International size paper as are necessary and inserted inside this form.

3. The claims defining the invention must start on a new page. If there is insufficient space on this form for the claims, use separate sheets of paper.

The words The claims defining the invention are as follows' should appear before claim 1. After the claims the date and the name of the applicant should appear in block letters.

4. This form must be accompanied by a true and exact copy of the description, claims and drawings (if any) and an additional copy of the claims.

(see Pamphlets explaining formal requirements of specifications and drawings) TO BE COMPLETED BY APPLICANT e N TECI-NOSEARCH PTY. LIMITED Name of Applicant. Actual Inventor(s): LADISLAV STEPHAN .KAPISEK Robert G. HALLIDAY Address for Service: 44 Ashley Street, Hornsby, N.S.W. 2077 Invention Title: .MNTS IN PIVOT AR LOCKS Details of Associated Provisional Applications: Nos: PM6877 filed 18,07.94 Details of Associated Provisional Applications: Nos: The following statement Is a full description of this invention, Including the best method of performing it known to me:- 7iZ, i -1- IMPROVEMENTS IN PIVOT ARM LOCKS.

S This invention relates to pivot arm locks of the type used commonly on sliding doors.

Locks for the above purpose desirably have several characteristics including, having the arm biased to the lock position, 00 (ii) provision of a securement member to releasably secure the arm in the lock position, (iii' multiple means to both activate and deactivate 0 00 o o* 000 o 00o 0 0o o0 00 o 0000 0 0O m 9 Ii o 1o 8 a m B e 0 0 10 the securement member, and preferably a manual means operational from what would be the inside of the door and key operated means operable from both sides of the door and which will over-ride the manual means, and (iv) means to prevent improper movement of the securement member, as by persons seeking forcibly open the lock to gain access to a zone closed off by the door.

The above features in various combinations are to be found in several known locks. However, an inspection of the mechanisms of the known locks (many of which are patented) reveals the known locks rely on reasonably complex interactions between numerous lock components in order to provide the desired characteristics. The present applicant has set out to provide a lock which has fewer and simpler components that is the case with 9 lilc~ ii Vi -2the known locks but which will provide all of the desirable characteristics referred to above and will at the same time provide a further security features.

Broadly stated the invention can be said to provide a door lock which includes a housing for mounting in a door adapted for sliding opening and closing movement, a latch member pivotally mounted in the housing, two arms on said latch member, hook means on one of said arms, an opening in a side of the housing adjacent said hook means to allow door locking K: 10 engagement between said hook means and a co-operating F stationary member on a door frame, first stop means in the housing, resilient biassing means in the housing to bias said o other arm into contact with said first stop means and thereby limit pivotal movement of the latch member in a first direction corresponding with a hooking movement of said latch member, a securement member having a part which provides a second stop means, said securement member is slidably mounted in said housing between positions where said second stop means is respectively in a latch member release position to allow S" 20 unhooking pivotal movement of said latch member and a latch member restraining position in the path of movement of said other arm away from said first stop means thereby preventing unhooking pivotal movement of said latch member.

A presently preferred embodiment of the invention will now be described with reference to the accompanying drawings where:

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_~l~IC I -3- Fig.l is a side view of a door lock according to the invention with a cover plate for the lock housing removed, where the latch member is free to move, Fig.2 is a view similar to Fig.l in which the latch member is prevented from moving in a lock release manner by a stop means on a movable securement member and 000 Fig.3 is a view similar to Fig.2 wherein the securement :o 10 member is shown latched in an operative condition.

00 0 000 In Fig.l there is shown a lock housing 1 having a 0 00 mounting plate 2 and a body 3. The body 3 is defined by walls 4,5,6 upstanding from a panel 7 such that the walls 4,5,6 and the mounting plate 2 enclose a cavity in which the lock working parts are housed. There are 0"000 pillars and walls upstanding from the panel 7 of a shape and size and for purposes as are hereinafter described.

The principal operating member of the lock is the pivotally movable latch member 8 comprising a hub 9 with a central through hole 10 of square shape for engagement by a drive bar coupled to operating handles in known manner. The hub 9 has upper and lower bosses whereby the latch member 8 is pivotally supported in apertures in the panel 7 and a cover (not shown) for the body cavity. There are two arms 11 and 12 extending from the hub 9 and the arms lie at substantially right angles each to the other.

The arm 11 terminates in an upstanding hooking lug 13 with a end face 14 and an inclined upper striker edge 15. There is an opening 16 in the mounting plate 2 adjacent the arm 11 to allow access to the hooking lug 13 of the arm 11 from outside the lock. As illustrated the arm 11 projects slightly beyond the plate 2, however this is not an essential of the 44, invention.

The arm 12 lies between a pillar 17 upstanding from the panel 7 and the back wall 5 of the body 3. The arm 12 has a blind :6 hole in which there is a housed an end of a compression spring:: 18 which bears at its other end on the inner face of the wall The spring 18 urges the arm 12 against the pillar 17 which acts as a stop means to limit the pivotal movement of the latch member 8 in a first direction corresponding with a hooking movement of the latch member 8. The arm 12 has a 19 at its lower end for a purpose to be later described.

A securement member 20 for the latch member 8 has a first end portion 36 permanently slidably housed in an upper guide defined by the mounting plate 2 and the pillar 17. The securement member 20 has a portion 46 at its other end with an *inner surface which is urged against an abi~tment face of a guide 21 upstanding from the panel 7. The means to urge the portion 46 against the guide 21 is a spring loaded ball 22 housed in the securement member 20. It is to be noted that the member 20 is spaced from the pillar 52. The member 20 is retained in one of three possible axial movement locations by the ball 22 engaging in one of three depressions 23,24,25 in the inner face of the mounting plate 2.

The movement of the member 20 can be achieved in two ways which involve actuator arms 30 and 27 respectively of manual and key operated actuators. The actuator arms 30 and 27:: respectively co-operating with notches 28 and 29 in the member The actuator arm 30 has an end portion 26 at one end and at its other end is joined to a hub 31 with bosses, similar to0 the hub 9, with upper and lower bosses pivotally supported in *o holes in the panel 7 and the housing cavity cover plate.

There is a square hole 32 through the hub 31 for a bar with an: attached knob or the like which is accessible from one side of the lock, which is the inside with respect to a door on which the lock is mounted.

The actuator arm 27 is moved by a key operated barrel assembly indicated 33 which is accessible from both sides of the door in which the lock is mounted. The barrel assembly 33 is engaged in 'keyhole' shaped openings in the panel 7 and the cover plate, when fitted. The barrel assembly is retained in t he body 3 by a screw 34 which enters through the mounting plate 2 and passes through a slot in the member 20 and holes in the legs of the pillar 52 and is threaded into the body of the barrel assembly 33.

By rotation of the barrel 35 of the assembly 33 with a key the actuator arm 27 can be arcuately moved to cause the securement member 20 occupy a first location with the ball 22 engaged in a: the depression 23. This places the member 20 is a latch member release condition as shown in Fig.l. The securement member 20 can be moved by the actuator arm 27 to a third 04 location where the ball 22 is on the depression 25 and the #00 actuator arm 27 lies within the assembly 33, see F21g.3.

It will be noted in Fig.l when the actuator arm 27 is positioned as shown the portion 26 of the actuator arm 30 is engaged deeply in the notch 28. As the key operated actuator arm 27 moves the securement member 30 to the Fig.3 position as a result of the end of the actuator arm bearing on the face of the notch 29, the portion 26 of the actuator arm 30 is moved out of the notch 28 and overlies the face 37 of the lug 38 on jIc_ II, L -7the member 20. The limit of arcuate member of the actuator arm 30 is determined by engagement between the leg 39 on the boss 31 with the body lug 40. When the reverse operation is performed the leg 41 adjacent the notch 28 will, in its downward movement, pick up the actuator arm portion 26 and return it to the notch 28.

Thus it is clear that the operation of the key operated actuator arm 27 will override the operation of the o actuator arm 30. Likewise it is clear that if the 10 actuator arm 30 has been used to position the o securement member 20 in the mid-position where the ball 22 is in the depression 24 the key operation of the actuator arm 27 will prevail and will return the securement member 20 to the Fig.l position.

A further aspect to be noted is that in order for the *actuators to operate in the manner described the actuator arm 27 needs to be positively movable by the key and at the same time there must be a degree of lost motion in the key operation to allow the actuator arm 27 to be moved between the positions of Figs.l and 3 by movement of the securement member 20 by the actuator arm 30. This is a feature inherent in the known barrel assembly used in this form of lock.

From the Fig.2 configuration it is can be seen that Swhen the ball 22 is in the depression 24 as a result of I- -rcl i L i" 9*9

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8 the manually induced arcuate movement of the actuator arm 30, the end portion 36 of the securement member will not normally be sufficiently close to the arm 11 of the member 8 to prevent disengagement of the hook 13 from the hooked end 48 of the fixed mating hook member 41 on the door jamb 42. To cater for this situation the lugs 19 and 47 are dimensioned such that the face of the lug 19 will lie in close proximity to the face 43 of the lug 47 thereby effectively preventing unhooking rotation of the latch member 8 by force applied to the latch member 8.

From the Fig.3 configuration it can be seen that the end 36 of the member 20 lies closely adjacent the underside of the arm 11 of the member 8. When the securement member 20 is in the Fig.3 location improper forced unhooking rotational movement of the latch member 8 would be initially prevented by the end 36 of the member 20 bearing against the arm 11 of the latch member 8. If the latch member does undergo some rotational movement as a result of an attempt to forcefully rotate the latch member 8 this will result in the shoulder 49 of the lug 19 on the arm 12 of the latch member 8 engaging under the shoulder 50 of the 47 on the arm 48 of the securement member 20. Continued downwardly applied force to the arm 11 in an attempt to forcefully release the hooking action of the latch 9 member 8 would more firmly engage the shoulders 49 and and effectively prevent any further unhooking rotation of the latch member 8. This arrangement provides an effective deadlocked condition for the securement member The present lock also addresses the possibility of a person attempting to release the lock by movement of the securement member 20 without movement of the latch member 8. In the unlikely event access could be obtained to the end 36 of the securement member 20 with the door latched closed, force applied to the end 36 without rotational movement of the latch member 8 could result in downward releasing movement of the securement member 20. This follows from the need to provide lost or motion in the operation of the key actuated lock. As a o* result the latch member 8 could be rotated and unhooked from the door jamb. The releasing movement of the securement member 20 as a result of force applied to the end 36 of the member 20 would be resisted by the progression of the ball 22 from the depression 25 to the depression 23.

This situation is not normally a serious security problem when the lock is in the Fig.2 condition, which is effected by the manual operation of the actuator arm from the inside of the door. Such operation would TrMrAM.VM71K---- 10 mean the area closed off by the door is occupied.

However, when the securement member 20 is moved by a key, either from the inside of the area having the door or from outside that area so as to achieve the Fig.3 condition, this is an action indicating that absolute security Js required and that unauthorised operation of the securement member 20 must be prevented.

In order to prevent the above manipulation of the securement member 20 latching means for the securement member is provided for the Fig.3 situation. The latching action is automatic in operation when the securement member 20 is activated fully by the key in the barrel assembly 73 and there is an automatic unlatching operation when the key is used to retract the securement member 20 to allow rotation of the latch member 8.

Referring to Figs.l and 2 it will be seen that when the ball 22 is in the depression 24 the inner face of the securement member 20 is urged against the pillar 17 and the guide 21 by the action of the spring loaded ball 22 bearing against the inner face of the mounting plate 2.

In Fig.3, where the securement member 20 is in the latch member movement restraining position, the lower end portion 46 of the member 20 has moved upwardly beyond the guide 21 and under urging by the spring 4; r

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loaded ball 22 the member 20 has pivoted laterally to bear on the pillar 52 and place the end 45 of the member 20 over the top edge of the guide 21. This condition is made possible by the actuator arm 27 retracting into the barrel assembly as part of the operation of moving the member 20 to the Fig.3 position. From Fig.3 it is clear that effort applied to the end 36 of the securement member 20 to move the member downwardly sufficiently to unhook the latch member 8 from the door jamb member 41 is resisted by the latching arrangement described.

o 0 *0 0 4 0 o "0 0*40 0 0 0 9*00 When latch member 8 is to be released from its movement restraining relationship with the securement member 20 the actuator arm 27 is moved in an arc anti-clockwise by the key.

The end of the actuator arm 27 will first enter the notch 29, then bear against the bottom 46 of the notch 29 and in so doing move the securement member 20 laterally. The lateral movement is sufficient to realign the end portion 46 of the member 20 with the guide 21. The actuator arm 27 in its continuing movement will then engage the bottom lug 49 of the recess 29 and whilst holding the end portion 46 in alignment with the guide 21 will return the end portion 46 to its position behind the guide 21.

Having described the lock in its various modes of 0* 9 0 90 00 00 0 00 S 00 0 00 0 0 09 0 00 00 0 0 90 4 00 S 0 00 0 04 o *0 0 *94~ 1 9 000..

0000 #090 4* 0 00 70 -m 12 operation the interaction of the member 8 with the fixed mating hook 41 on the door jamb 42 will be described. As will be clear from Fig.3 if the lock is mounted in a sliding door and the door is slid towards the door jamb 42 the member 8 will be pivoted anti-clockwise by engagement of the angled face 15 of the arm 11 with the hook end 48 on the fixed hook 41.

When the hooking surfaces pass each other and the spacing between the lock mounting plate 2 and the door 1 jamb 42 is as shown in Fig.3 the spring 18 will cause the member 8 to pivot clockwise thereby providing the interconnected condition shown in Fig.3. Unlatching to allow the door to be slid open is achieved by rotation of a shaft mounted in the hole 10 in the boss ro e 9.

o The foregoing description is of a preferred embodiment of the invention and it is to be understood that changes can be made to various components described with departing form the inventive concept hereinbefore disclosed.

Claims (9)

1. A door lock which includes a housing for mounting in a door adapted for sliding opening and closing movement, a latch member pivotally mounted in the housing, two arms on said latch member, hook means on one of said arms, an opening in a s ide of the housing adjacent said hook means to allow door locking engagement between said hook means and a co-operating stationary member on a door frame, first'stop means in the housing, resilient biassing means in the housing to bias said other arm into contact with said first stop means and thereby limit pivotal movement of the latch member in.- a first direction corresponding with a hooking movement of said latch member, a securement member having a part which provides a second stop means, said securement member is slidably mounted in said housing between positions where said second stop means is respectively in a latch member release position to allow unhooking pivotal movement of said latch member and a latch member restraining position in the path of movement of said other arm away from said first stop means thereby preventing unhooking pivotal movement of said latch member.

2. A door lock as claimed in claim 1 having a key operated actuator which is mounted in said housing and is provided with an actuating arm engagable with said securement member to slide said securement member between the positions where said second stop means is in said latch member release position or hA -14- j A~I~I V 4) O 5 0 54 044 o 5 4 o 0 000 0 4 4 40 .4 *4 0 44 0 4 44 0400 40 40 004000 0 -40 4' 0 4 404 44 04' 0 O 00 00 said latch member resraining position.

3. A door lock as claimed in claim 2 wherein the actuating arm of said key operated actuator can also slide said securement member to a position where said second stop means is in said latch member restraining position and said securement member is deadlocked against forced releasing movement of said securement member.

4. A door lock as claimed in claim 1 including a manually operable actuator mounted in said housing, said manually operated actuator including an actuating arm to move said securement member and said second stop means thereof between said latch member release and restraining positions.

A door lock as claimed in claim 2 which also includes a manually operable actuator mounted in said housing and provided with an actuating arm to move said securement member, the arrangement being such that either the key operated or the manually operated actuator can be used to move said securement member and said second~stop means thereof between said latch member release and restraining positions.

6. A door lock as claimed in any one of the claims 1 to wherein the securement member is mounted in guide means to guide said securement member in its movement between positions where said second stop means is in the latch member restraining or release positions, said guide means including an upper guide, a lower guide with an abutment face and an 15 abutment member with an abutment face, biassing means to urge said securement member laterally towards said abutment faces, said securement member at all times having a bearing portion adjacent an upper end of the securement member engaged with said upper guide means, and when is an undeadlocked condition having a lower end portion engaged in said lower guide and in biassed engagement with the abutment face of the lower guide, said securement member when in a deadlocked condition having said lower end portion disengaged from said lower guide and a part of said securement member intermediate its ends in 4o4 biassed engagement with the abutment face of said abutment s member thereby misaligning said lower end portion of the oI°o securement member with said lower guide, and wherein the actuating arm of said key operated actuator during movement of 4 4t said securement member from the restraining position of the I, second stop means to the release position of the second stop means provides lateral movement of the securement member to S: realign said lower end portion of said securement member with o said lower guide and longitudinal movement of said securement member to reposition the lower end portion of said securement member in said lower guide.

7. A door lock as claimed in claim 6 including securement member retaining means to selectively releasably retain the securement member in one of three locations, a first location corresponding with the release position of second stop means, a second location corresponding with the restraining position 16 of the second stop means and a third location corresponding with the deadlocked position of the securement member, the securement member being movable between first and d locations by both of said actuator arms and being e between the first and third locations by the actuator arm of the key operated actuator.

8. A door lock as claimed in claim 7 including further deadlocking means for said securement member comprising hookingly engagable abutments on said second stop means and the second arm of said latch member, said further deadlocking means being engagable when said securement member is in its deadlocked condition and said latch member is given an unhooking pivotal movement.

9. A door lock substantially as hereinbefore described with reference to any one of the accompanying drawings. Dated this 18th day of November, 1998 TECHNOSEARCH PTY. LIMITED By its Patent Attorney Robert G. Halliday a *A o C *e a *a I 0*4 a: as a -1- ABSTRACT A door lock including a housing for mounting in a sliding door with a pivotally mounted latch member (8) and a slidably mounted securement member (20) for the latch member both mounted in the housing The o, latch member has a hooked arm (11) accessible through an opening (16) in a wall of the housing .o. o00, The securement member (20) is movable into and out of latch member opening movement preventing position by a manual actuator and/or a key operated actuator (27). u h(h( c