AU783573B2 - A surface mounted lock - Google Patents

Description

S&FRef: 586146

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

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 St Martins Tower,Level 31 Market Street Sydney NSW 2000 (CCN 3710000177) A Surface Mounted Lock 0 0* ASSOCIATED PROVISIONAL APPLICATION DETAILS [33] Country [31] Applic. No(s) AU PR2909 [32] Application Date 06 Feb 2001 The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5815c A SURFACE MOUNTED LOCK Technical Field The present invention relates to locks.

Background of the Invention Conventional surface mounted locks have a tongue which extends from the lock body to engage an adjacent striker. Generally these locks are provided with a key operated mechanism which is operable to retain the tongue in the extended position located within the striker. The mechanism is made complex by the length the tongue is 1o required to penetrate the striker.

The above mentioned complexity results in increased costs and can result in failure of the lock.

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

Summary of the Invention There is disclosed herein a lock to engage a striker member, said lock including: a base to be secured to a door; a lock tongue moveably mounted on the base for linear movement in a predetermined direction relative thereto between an extended striker engaging position and a retracted position released from the striker; a lock mechanism mounted on the base and operable to retract the tongue from the extended position to the release position; a hollowed body fixed to the base and enclosing said mechanism; and wherein said body extends beyond the base to provide a cavity within which the striker is at least partly received so that the lock tongue when engaged with the striker is concealed to inhibit direct manipulation of the tongue to move the tongue to the retracted position.

There is still further disclosed herein a lock to be fixed to a door and to engage a striker, said lock including: a mounting base to be secured to the door; a lock tongue assembly moveably mounted on the mounting base for linear movement relative thereto in a predetermined direction between an extended position to engage the striker and a retracted position released from the striker, said assembly including a base part and a striker engaging part and being associated with the base part [R:\LIBTT]02984.doc:yxa so as to be moveable relative thereto in said direction between a first and a second position, and a spring extending between the two tongue parts to urge said engaging part to the first position thereof; an operator member associated with the tongue assembly and used by an operator to move the tongue assembly from the extended position to the retracted position of the tongue; and locking means selectively operable to engage said engaging part to maintain said engaging part in engagement with the striker, said operator member being rendered essentially ineffective as operation thereof to retract said assembly will cause movement of said base part relative to said tongue part so that said tongue part is located in the •second position thereof.

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 perspective view of a lock; Figure 2 is a schematic perspective view of the internal mechanism of the lock of Figure 1 associated with a striker; Figure 3 is a schematic plan view of the operating mechanism of the lock of Figure o 20 1; "Figure 4 is a schematic perspective view of the lock mechanism of Figure 3; Figure 5 is a further schematic perspective view of the lock mechanism of Figure 4; and Figure 6 is a still further schematic perspective view of the lock mechanism.

Figure 7 is a schematic parts exploded perspective view of the lock of Figure 1.

Detailed Description of the Preferred Embodiments In the accompanying drawings there is schematically depicted a surface mounted lock to be mounted on a door to engage a striker 11 to retain the door closed.

The lock 10 includes a mounting base 12 which is secured to a surface of the door.

The base 12 supports the lock operating mechanism 13 which is associated with the lock tongue 14. In this embodiment the tongue 14 is an assembly including a base part 15 and a striker engaging part 16. The tongue 14 is moveable between an extended position at which the part 16 is engaged within the striker 11, and a retracted position released from the striker 11 so that the door may be opened.

[R:\LIBT102984.doc:yxa Enclosing the mechanism 13 is a hollowed body 17 which is secured to the base 12 but projects therefrom to provide a cavity 18 within which the tongue engaging portion 19 of the striker is located. The body 17 by enclosing the portion 19 conceals the forward portion of the tongue 14, that is the extremity of the tongue engaging part 16. This inhibits direct manipulation of the tongue 14 to move the tongue to the retracted position.

The mechanism 13 includes an operator manipulated lever 20 which a user pivots in the direction of the arrow 21 to cause retraction of the tongue 14 to the release position.

The lever 20 is pivotably mounted by means of shafts 22 being pivotably supported io on mounting blocks 23. Extending from each shaft 22 is a lever 24, one of which engages a projection 25 of the base part 15. More particularly the projection 25 has an end 26 :..engaged by one of the levers 24.

The tongue engaging part 16 has a recess 27 that slidably receives an eyelet 28 of the base part 15. Projecting internally of the eyelet 28 is a flange 29 of the part 16, with a spring 30 extending between the flange 29 and the eyelet 28 to urge the part 16 to the position depicted. More particularly, relative movement between the parts 15 and 16 allows the part 16 to be located in a first position (as depicted) and a second position in which the spring 30 is compressed and the part 16 moved relative to the part 15 in the direction of the arrow 31.

20 The mechanism 10 includes a hub 32 which includes an inner lock cylinder 33 and an outer lock cylinder not illustrated. Each of the cylinders includes an inner end received within a shaped aperture 34. The apertures 34 are of a conventional shape to permit relative movement between the hub 32 and the two cylinders.

The hub 32 has a first cam member 35 that is angularly moveable between a first position (Figure 5) positioned behind the part 16 to prevent retraction thereof, and a second position (Figure 6) spaced from the part 16 to permit retraction thereof The cam member 35 has a projection 36 to engage the part 16.

The hub 32 includes a second cam member 37 having a projection 38. The projection 38 engages an associated one of the levers 24 when either of the cylinders is operated by an associated key. More particularly the cylinders rotate the hub 32 in the direction of the arrow 39 to retract the tongue 14. Movement of the projection 38 causes pivoting of the lever 20 so that the lever 24 engages the end 26 to retract the tongue 14.

More particularly the projection 36 engages a projection 40 of the part 16 to retain the part 16 in the extended position, that is a position engaged with the striker 11.

[R:\IBT]02994.doc:yxa 4 The hub 32 is an assembly including the cam members 35 and 37 held together by means of a threaded fastener having a head 41 provided with the aperture 34. The cam member 37 has a square aperture 41 within which a square projection 42 of the cam member 35 is received so that the cam members 35 and 37 move angularly in unison with operation of either cylinder. The cam member 35 also has an annular step 43 that is received within an annular step 44 of a mounting member 45 forming part of the base 12.

The member 45 provides the blocks 23. The cam members 35 and 37 are therefore pivotably supported on the member Extending between the member 45 and the tongue 14 is a spring 46 which urges the ••tongue 14 to the extended position. More particularly the spring 46 extends between the •,member 45 and the part 16.

-Mounted on the body 17 is a catch 47 that engages within a recess 48 in the part 16.

When the catch 47 is depressed so as to protrude into the recess 48 the tongue 14 is retained in a retracted position. In this respect it should be appreciated that the catch 48 has an end flange 49 that engages beneath the part 16 so that the catch 47 is retained in the depressed position. Operation of the lever 26 however will release the catch 47 so that it automatically returns to a position releasing the tongue 14. A spring 50 urges the 20 catch 47 to the release position.

The tongue engaging part 16 has an arcuate comer 51 that engages a sloping surface 52 of the striker 11 when the door is moving to the closed position, to cause the tongue 14 to move to the retracted position. Once it is passed the striker 11 the tongue 14 will then move to the extended position engaged within the striker 11.

When the door is in the closed position the lock 10 can be operated to disengage from the striker 11 by movement of the lever 20. This is assuming the projection 36 is spaced from the projection 40. However to prevent operation of the lock 10 by movement of the lever 20, either cylinder may be operated by means of a key to move the projection 36 into alignment with the projection 40. This retains the two engaging part 16 within the striker 11. If an attempt is made to force the lever 20, the tongue engaging part 16 does not move as movement of the lever 20 will merely cause compression of the spring [R:\LIBT]02984.doc:yxa In this respect it should be appreciated that significant force would need to be applied to the lever 20 to cause compression of the spring 30. Under normal conditions the spring would not be compressed by operation of the lever e [R:\LIBMT102984.doc:yxa

Claims (7)

1. A lock to engage a striker member, said lock including: a mounting base to be secured to a door; a lock tongue moveably mounted on the base for linear movement in a predetermined direction relative thereto between an extended striker engaging position and a retracted position released from the striker; a lock mechanism mounted on the base and operable to retract the tongue from the extended position to the retracted position; a hollowed body fixed to the base and enclosing said mechanism; and wherein said body extends beyond the base to provide a cavity within which the striker is at least partly received so that the lock tongue when engaged with the striker is concealed to inhibit direct manipulation of the tongue to move the tongue to the retracted position.

2. The lock of claim 1 wherein said lock tongue is an assembly, the lock is tongue assembly being moveably mounted on the mounting base for linear movement relative thereto in a predetermined direction between an extended position to engage the striker member and a retracted position released from the striker member, said assembly including a base part and a striker engaging part, the striker engaging part being associated with the base part so as to be movable relative thereto in said direction between 20 a first and a second position, and a spring extending between the base part and the striker engaging part towards said striker engaging part to the first position thereof; and wherein said locking mechanism includes: an operator member associated with the tongue assembly and used by an operator to move the tongue assembly from the extended position to the retracted position; and locking means selectively operable to engage said striker engaging part to maintain said striker engaging part in engagement with the striker member, said operator member being rendered essentially ineffective as operation thereof to retract said assembly will cause movement of said base part relative to said striker engaging part so that said striker engaging part is located in the second position thereof.

3. The lock of claim 1 wherein said lock mechanism includes an operator member associated with the tongue and used by an operator to move the tongue from the extended position to the retracted position thereof, said operator member being pivotly mounted on said base for pivoting movement about an axis to extend generally parallel to [R:\LIBTI]02984.doc:yxa the door and generally normal to said direction so that pivoting movement of the operator member to move the tongue to the release position is also the direction to move the door to an open position.

4. A lock to be fixed to a door and to engage a striker member, said lock including: a mounting base to be secured to the door; a lock tongue assembly moveably mounted on the mounting base for linear movement relative thereto in a predetermined direction between an extended position to 0to engage the striker member and a retracted position released from the striker member, said assembly including a base part and a striker engaging part and being associated with the base part so as to be moveable relative thereto in said direction between a first and a •second position, and a spring extending between the base part and striker engaging part to urge said engaging part to the first position thereof;

5 Is an operator member associated with the tongue assembly and used by an operator to move the tongue assembly from the extended position to the retracted position; and locking means selectively operable to engage said engaging part to maintain said engaging part in engagement with the striker member, said operator member being rendered essentially ineffective as operation thereof to retract said assembly will cause movement of said base part relative to said engaging part so that said engaging part is located in the second position thereof. The lock of claim 4 wherein said locking means includes a user manipulated lock cylinder, a can member operatively associated with the lock cylinder to be moved thereby between a first position engaging said striker engaging part to maintain said striker engaging part in engagement with the striker member, and a second position permitting movement of the striker engaging part.

6. The lock of claim 3, 4 or 5 wherein said operator member is pivotally mounted for pivoting movement about an axis to extend generally parallel to the door and normal to said direction, said operator member including a lever engaged with said base part to cause movement thereof upon pivoting movement of the operator member to move the base part to retract said striker engaging part. [R:\L1BTT02984.doc:yxa 8

7. The lock of claim 4 or 5 further including a catch member movable into engagement with the tongue assembly to retain the striker engaging part in the retracted position. Dated 6 February, 2002 Doric Products Pty Limited Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON e [R:\LIBTT]0294.doc:yxa