AU731875B2

AU731875B2 - A mortise lock

Info

Publication number: AU731875B2
Application number: AU95153/98A
Authority: AU
Inventors: Michael Alchin
Original assignee: Doric Products Pty Ltd
Current assignee: Doric Products Pty Ltd
Priority date: 1997-05-30
Filing date: 1998-11-30
Publication date: 2001-04-05
Anticipated expiration: 2018-04-27
Also published as: AU9515398A

Description

I

S F Ref: 418684D1

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

o *O 5

S

Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: Doric Products Pty Limited 46-48 Redfern Street Wetherill Park New South Wales 2164

AUSTRALIA

Michael Alchin Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia A Mortise Lock The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5845 A MORTISE

LOCK

Technical Field The present invention relates to locks and more particularly but not exclusively to mortise locks.

Background of the Invention Mortise locks are frequently used in fire escape doors. These locks are required to provide for exit but prevent entry without the appropriate key. In adapting mortise locks to fulfil this function complex overriding mechanisms are provided so that the lock has a "fire egress" function.

10 The complexity of the lock adds considerably to its cost and reliability.

Object of the Invention It is the object of the present invention to overcome or substantially ameliorate the above disadvantages.

So Summary of the Invention There is disclosed herein a lock having: a body; 0Sa lock tongue mounted in the body for linear movement between an extended o position protruding from the body and a retracted position displaced from the extended position into the body; a retaining assembly including a trigger mounted in the body and movable •00 o between an extended position protruding from the body and a retracted position displaced from the trigger extended position inwardly of the body, the assembly being operatively associated with the lock tongue to retain the lock tongue in the tongue extended position; S •operator manipulable means associated with the tongue and used by an operator to move the tongue from the tongue extended position to the tongue retracted position; means urging the tongue to the tongue extended position; and an overriding member mounted on the tongue and movable with respect to the tongue and body between a first and a second position, said overriding member being operatively associated with said retaining assembly so that when said trigger is in its retracted position, said overriding member in its first position permits engagement of the retaining assembly with the tongue to retain the tongue in the extended position, while when said overriding member is in its second -position said assembly permits movement of said tongue to its retracted position.

1N:\I.B1T1T1O 157:PVIH Brief Description of the Drawings A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings wherein: Figure 1 is a schematic side elevation of a mortise lock; Figure 2 is a further schematic side elevation of the mortise lock of Figure 1; Figure 3 is a schematic side elevation of the mortise lock of Figure 1 in a further operative position; Figure 4 is a still further schematic side elevation of the lock of Figure 1; Figures 5 to 12 are schematic side elevations of a modified form of the lock of 1 o Figures 1 to 4, in various modes of operation.

Se Detailed Description of the Preferred Embodiment In the accompanying drawings there is schematically depicted a mortise lock The mortise lock 10 is adapted to provide a fire egress feature. The side cover plate has S been removed to expose the interior of the lock The lock 10 includes a body 11 within which there is slidably mounted a lock tongue 12 movable between an extended position as shown in Figures 1 and 3 and a retracted position as shown in Figures 2 and 4. In the retracted position the tongue 12 is displaced from the extended position inwardly of the body 11. A spring 48 urges the tongue 12 to the extended position. The spring 48 engages a flange 49 attached to a side •:2o wall or side cover of the loc, and an end wall 50 of the tongue 12.

Associated with the lock tongue 12 is a retaining assembly 13 which is adapted to •0 selectively retain the tongue 12 in the extended position. The assembly 13 includes a trigger 14 slidably mounted in the body 11 for linear movement between an extended S position as shown in Figure 2, and a retracted position as shown in Figures 1 and 3, the trigger retracted position being displaced inwardly of the body from the trigger extended S position. Both the tongue 12 and the trigger 14 are intended to cooperate with the door jamb or striker plate. The tongue 12 engages within the striker plate while the trigger 14 engages the striker plate and is caused to move from its extended position to its retracted position. Associated with the trigger 14 is a catch member 15 which is linearly movable between a position as shown in Figures 1 and 3, engaging an abutment surface 16 of the tongue 12 preventing retraction of the tongue 12 to the retracted position to a position allowed by movement of the tongue 12. The catch member 15 is urged to its position against the surface 16 by means of a spring 17. The member 15 has an inclined ramp surface 18 which is engaged by an inclined ramp surface 19 of the trigger 14. A spring 20 urges the trigger 14 to its extended position and overcomes the force provided by the spring 17 to thereby urge the member 15 to its first position (as shown in Figure 2) that is displaced from the surface 16 and permitting retraction of the tongue 12. This occurs by engagement of the surface 19 with the surface 18.

I N:\.,l131710 1 57: PVI-1 The tongue 12 has slidably mounted on it a trigger overriding member 21 which is mounted in a slot of the tongue 12 and is captively located with respect thereto. The member 21 is of a configuration so as to have a transversely extending base 22. The member 21 is slidably mounted on the tongue 12 so as to be linearly movable in a direction parallel to the direction of movement of the tongue 12. The member 21 is limited in its movement relative to the tongue 12 in that the tongue 12 is provided with a slot 23 which engages a pin 24. The pin 24 is fixed to the member 21 thereby limiting relative movement of the member 21 with respect to the tongue 12.

Rotatably supported in the body 11 is a pair of actuators 25 of which only one is illustrated. In the drawings the actuator 25 illustrated is angularly movable between the two positions and The actuator 25 illustrated would be mounted on a shaft S extending to the exterior of the lock 10 and upon which a handle would be mounted. The actuator 25 illustrated would have its handle mounted adjacent the exterior surface 26 of the body 11. A second actuator 25 would have its handle located on the opposite side of e15 the body 11 to the surface 26. The pair of handles provided would then enable the person S installing the lock 10, to select which of the two handles is to be operable. This handle S would then provide the fire egress function.

The actuator 25 illustrated has an arm 27 which is engaged with the base 22 so S that upon rotation of the associated handle in the direction of the arrow 28, the member 20 21 is caused to move relative to the tongue 12 until the pin 24 engages the end of the stop S 23. Upon this engagement and further rotation of the handle in the direction of the arrow 28, the tongue 12 is retracted. The tongue 12 is released for movement by cooperation between the member 21 and the catch member 15. The member 21 has an inclined ramp S surface 29 which engages a corresponding inclined ramp surface 30 on the catch member 25 15. Movement of the member 21 in the direction of the arrow 31 relative to the tongue 12 causes the surfaces 29 and 30 to move the catch member 15 to a position of non- S engagement with the surface 16. The tongue 12 is then free to move to its retracted position. Further movement of the member 21 in the direction of the arrow 31 retracts the tongue 12. A spring 47 engages the body 11 and an extension 51 of arm 27, to urge the-arm 27 to move in the opposite direction to the direction indicated by the arrow 28.

Slidably mounted in the body 11 is a lock slide 32 which is movable in a direction transverse of the direction of movement of the tongue 12. The slide 32 has two operative positions as shown in Figure 3 and as shown in Figure 2. When the slide 32 is in the position it is basically inoperative. When located in the position it renders one of the actuators 25 inoperative by preventing movement thereof. The slide 32 is moved by the lock cylinder 33. The cylinder 33 is provided with a cam 34 which is engagable within a recess 35 of the slide 32. The recess 35 has two end faces 36 and 37. Insertion of an appropriate key in the lock cylinder 33 and rotation thereof will cause engagement of the cam 34 with one of the end faces 36 or 37. This engagement IN:\LI13TT]011 57: PVIwill then cause linear movement of the slide 32 in the direction of the arrow 38. If the slide 32 is in its position and the cylinder 33 rotated in the direction of the arrow 39, the cam-34 will engage with the face 37 and move the slide 32 to the position thereof.

If the slide 32 is in its position rotation of the cylinder 33 in the opposite direction of the arrow 38 will cause engagement of the cam 34 with the face 36 and move the slide 32 to its position The positions and of the slide 32 are defined by a pin 40 (with a tapered end) engaged within one of associated recesses 41 and 42. The pin 40 is urged by means of a spring 43 into the recesses 41 and 42. The position is defined by engagement of lo the pin 40 in the recess 41. The position is defined by engagement of the pin 40 in S the recess 41.

S. •The slide 32 also includes a threaded shaft 44 upon which there is mounted a nut The nut 45 is retained in the slide 32 so that it cannot rotate. Rotation of the shaft 44 will cause movement of the nut 45 in a direction generally perpendicular to the direction of movement of the arms 27. When the slide 32 is in its position the nut 45 will engage one of the arms 27 so as to prevent movement of the associated handle. This is best seen in Figure 2 where the abutment 46 is engaged with the nut.

As explained above, operation of the cylinder 33 will selectively inhibit operation one of the handles. The handle to be rendered inoperative is determined by the o .'2o position of the nut 44. Accordingly, an installer of the lock 10 can determine which of the handle is to provide the fire egress function.

•eees In the above embodiment the cylinder 33 is also operable via the cam 34 to move othe slide 32. In this embodiment the cam 34 also engages the end faces 36 and 37.

Accordingly operation of the cylinder 33 not only moves the slide 32, but also retracts the tongue 12 by movement of the member 21. For example if the cam 34 is initially located in the recess 35 the slide 32 must be in its position. Rotation of the cam 34 in a direction opposite to the arrow 38, the cam 34 will move the slide to the position Further rotation of the cam 34 will bring the cam 34 into contact with the base 22 and retract the tongue 12.

In Figures 5 to 12, the lock illustrated has applied to it the same reference numerals as the above described embodiment. However in this modified form, the lock has the spring 48 extending between a lateral flange 58 of the tongue 12, and a flange 59 of the lock body 11. The catch member 15 has been modified so as to be pivotably mounted on a post 60, and is provided with a barb 61 to engage the surface 16. The pin 40 and recesses 41 and 42 have been eliminated and replaced with a spherical locating member 61 urged by a spring (not illustrated) into engagement with apertures in the removed side cover. The apertures would be spaced in a similar manner to the recesses 41 and 42, so that the slide 32 is held in the appropriate position.

1- 1 ,nTll~ C In addition to the above alterations, the member 21 is provided with a rearwardly extending projection 62 having a ramp surface 63. The ramp surface 63 engages a further ramp surface 64 formed on the slide 32. When the member 21 is moved rearwardly toward the slide 63, and the surfaces 63 and 64 are aligned, the surface 63 causes movement of the slide 32 to the position thereof. Because of this arrangement, when one handle is actuated, the other handle (actuator 25) is then automatically released for movement due to movement of the slide 32 to the position d 0 006 0000 0* 0 0* 0. IN-\I.IRTT I 1 ;7-PVH

Claims

1. A lock having: a body; a lock tongue mounted in the body for linear movement between an extended position protruding from the body and a retracted position displaced from the extended position into the body; a retaining assembly including a trigger mounted in the body and mnovable between an extended position protruding from the body and a retracted position displaced from the trigger extended position inwardly of the body, the assembly being operatively l o associated with the lock tongue to retain the lock tongue in the tongue extended position; o ,mo operator manipulable means associated with the tongue and used by an operator S •to move the tongue from the tongue extended position to the tongue retracted position; means urging the tongue to the tongue extended position; and an overriding member mounted on the tongue and movable with respect to the tongue and body between a first and a second position, said overriding member being operatively associated with said retaining assembly so that when said trigger is in its retracted position, said overriding member in its first position permits engagement of the retaining assembly with the tongue to retain the tongue in the extended position, while S when said overriding member is in its second position said assembly permits movement of 20 said tongue to its retracted position.

2. The lock of claim 1, wherein said retaining assembly further includes a catch member engaged by the trigger to provide for movement of the catch member between the extended and retracted positions of the retaining assembly, said catch member, when in the extended position thereof engaging the tongue to retain the tongue 25 in the tongue extending position.

3. The lock of claim 2, further including means urging the catch member to the extended position thereof, and means urging the trigger to the extending position thereof.

4. The lock of claim 2 or 3, wherein the catch member is linearly moveable between its extended and retracted positions.

The lock of claim 2 or 3, wherein the catch member is pivotably moveable between the extended and retracted positions thereof.

6. The lock of any one of claims 2 to 5, wherein the catch member and/or the trigger is/are provided with a ramp surface or surfaces to provide for movement of the catch member between the extended and retracted positions thereof.

7. The lock of any one of claims 1 to 6, wherein the overriding member is engaged by the operator manipulable means to be moved between the first and second positions of the overriding member, with the tongue being moved from its extended position to its retracted position by engagement with the overriding member moving the IN:\I.IBTT101 157:PVI -7- beyond the second position in the direction of movement from said first position to said second position so that said retaining assembly permits movement of the tongue to its retracted position.

8. The lock of claim 7, further including a lock cylinder operatively associated with the overriding member so that upon key actuation of the lock cylinder, the overriding member is moved to its second position so that said retaining assembly permits movement of the lock tongue to its retracted position, with the lock tongue being moved to its retracted position by said lock cylinder moving said overriding member beyond the second position thereof in the direction of movement from the first position to the second position of the overriding member.

9. The lock of claim 8, wherein said overriding member includes a first 00 00 projection engaged by the said operator manipulable means, and a second projection engaged by said lock cylinder. The lock of claim 8 or 9, wherein said operator manipulable means includes a pair of actuators, each being operatable from a different side of the lock, with each actuator being associated with the overriding member.

S

11. The lock of claim 10, further including disabling means to effectively disable one of the actuators to prevent the disabled actuator moving the overriding *00 member from its first position to its second position.

12. The lock of claim 11, further including a coupling member moved by said lock cylinder, said coupling member having mounted on its said disabling means, so Sthat said disabling means is moved to a position disabling one of the actuators, said coupling means being also operatable by said lock cylinder to remove the disabling means *so as to permit movement of both of the actuators to retract the lock tongue.

13. A lock, substantially hereinbefore described with reference to Figs. 1 to "as 4 or 5 to 12. o0 Dated 30 November, 1998 Doric Products Pty Limited Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON IN:\LIBTTJ]I 157: PVI1