AU653062B2 - A lock - Google Patents

Description

653062

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT r Name of Applicant: Actual Inventor: Address for Service: Invention Title: WHITCO PTY LTD MERVYN GEORGE HARCOURT CULLEN CO., Patent Trade Mark Attorneys, 240 Queen Street, Brisbane, Qld. 4000, Australia.

A LOCK r D iro r Details of Associated Provisional Applications: Nos. PK8623 The following statement is a full description of this invention, including the best method of performing it known to us: THIS INVENTION relates to a lock and particularly relates to a lock for securing a door, window and the like against movement.

Double hung doors comprise a pair of doors hingedly mounted to opposed door frame members. These doors (also called French doors) are closed by bolting one door to the door surround frame or floor and then locking the other door to the first door using a morticed door lock. The invention particularly relates to a lock which locks the first door to the door surround frame or floor.

A known type of such lock comprises a "flush" bolt assembly where a bolt can be moved between an extended and retracted position by means of a handle which is connected to the bolt through an over centre type mechanism. By pulling the handle upwards or downwards, the bolt is caused to move in the opposite direction thereby locking or unlocking the door.

A disadvantage with this type of flush bolt is its complexity of manufacture as the over centre handle (also called "flick" mechanism) is complicated, expensive to manufacture and includes a large number of parts which are required to be .i assembled. Fixing the lock to the door also requires at least two screws.

It is an object of the invention to provide a simplified but yet effective lock which can be used to lock a door, window or like member to a surround frame or floor surface which may overcome the abovementioned disadvantages or provide the public with a useful choice.

3 In one form, the invention resides in a lock for releasably securing a door comprising a lock body mountable to adjacent a lower or upper edge of the door, a slide member slidably moveable relative to the lock body and having a bolt portion extending from one end thereof, said slide member being moveable between an extended position where the bolt portion extends from the lock body and is engageable with a keeper to secure the door, and a retracted position where the bolt portion is free from the keeper, retaining means to releasably retain the slide member in its extended position and its retracted position, and biasing means to bias the slide member into engagement with the retaining means whereby the slide member can be moved between the retracted and extended positions by initially moving the slide member against the bias of the biasing means to free the slide member from the retaining 2d'" means and then moving the slide member to the desired extended or retracted position.

While the lock has particular relevance to double hung doors, it is also suitable for locking doubles hung windows or sliding doors or windows.

The lock body suitably comprises an elongate plate which is preferably formed from diecast metal. The elongate plate suitably includes a fixing aperture to allow a fastener to fasten the lock body to a door or like member. The fixing 4 aperture is preferably located adjacent one end of the lock body which is distant from the bolt portion of the slide member. Preferably, only a single fixing aperture is provided to allow for ease of installation. The lock body is preferably recessed or morticed into a door stile to render it flush with the door stile when fitted.

The elongate plate may include a rear surface which is suitably provided with a housing to locate one end of the slide member. The housing may comprise a pair of spaced parallel upstanding walls between which the one end of the slide member may pass.

The rear surface may also include a guide for the bolt portion of the slide member. The guide may comprise an .9 upstanding boss having a bore extending therethrough through which the bolt portion can pass. The boss is preferably integrally formed with the elongate plate.

The lock body may include a lip portion which can assist in securing the lock body to txix door. The lip portion may extend from the upstanding boss and is preferably formed 2d"' with the boss.

The lock body may be provided with a longitudinal slot extending therethrough to allow access to the slide member through a front surface of the lock body to enable the slide member to be moved manually between its extended and retracted positions.

The slide member suitably comprises an elongate slide body. The elongate slide body is suitably of a plate like configuration. One end of the elongate slide body is suitably formed with an upstanding end wall. The bolt portion may extend from and be secured to the end wall. Preferably, the slide body, end wall and bolt portion are integrally formed. The bolt portion may comprise an elongate cylindrical body. The free end of the body may be provided with a bore extending partially therethrough to accommodate a hardened pin to resist cutting through the bolt.

The retaining means suitably comprises an abutment member extending from the rear surface of the lock body. The slide member may include a pair of spaced abutment member retaining means to prevent movement of the slide member when S the slide member is in its extended or retracted position.

The abutment member retaining means may comprise a recess extending into or through the slide member, the recess being.

ij dimensioned to accept the abutment member. Alternatively, the abutment retaining means may comprise a ridge, lip or similar *l member. It should be appreciated that the abutment member may be located on the slide member with the abutment member retaining means being located on the lock body.

2 If each of the abutment member retaining means comprise a recess it is preferred that the recesses are joined by a slot. A guide pin may extend above the abutment member and may be dimensioned to pass along the slot.

The biasing means suitably comprises a spring. The spring suitably biases the slide member against the lock body.

The spring may extend about the guide pin and between a lock circlip and a washer.

The slide member may include a finger engageable portion. The finger engageable portion may extend into the slot on the lock body to allow it to be manipulated by an operator.

The invention will be better understood by reference to the following description of a preferred embodiment thereof in which Figure 1 is an exploded view of a lock according to an embodiment of the invention and a door stile.

Figure 2 is a plan view of the lock of figure 1 in l0.. its retracted position.

Figure 3 is the view of the lock of Figure 2 in its extended position.

Figure 4 is a side part sectional view of the lock of Figure 2 in its retracted position.

Referring to the drawings there is disclosed a lock 10 for releasably securing a door 11. Lock 10 comprises a lock body 12 mountable as shown in Figure 1 to adjacent a lower edge 13 of door 11. Lock 10 further includes a slide member 14 (better shown in Figures 2 one end of slide member 14 being provided with a bolt portion Lock body 12 is in the form of an elongate rectangular plate. One end of lock body 12 is provided with a fixing aperture 16 which can accept fastener 17 to fasten the lock to an edge of door 11 as shown in Figure 1i. Lock body 12 further includes a slot 18 the purpose of which shall be described in greater detail below.

The rear face of lock body 12 (better shown in Figures 2 4) is provided with a housing 19 in the form of a 7 pair of spaced parallel walls 20 connected by wall 21.

Housing 19 functions to house upper part of slide member 14.

The rear surface of lock body 12 is further provided with a guide in the form of an upstanding boss 22 which has a bore 23 extending therethrough, through which bolt portion 15 can slide. Boss 22 is integrally formed with lock body 12 as is housing 19. A lip 24 extends from boss 22 and parallel to lock body 12. Lip 24 functions to assist in fixing the lock to door 11 as shall be described in greater detail below.

0 Slide member 14 comprises an elongate slide body having a plate-like configuration as shown in the drawings.

One end of slide member 14 is formed with an upstanding wall 25 which is reinforced by braces 26. Bolt portion 15 is integrally formed with wall 25 and extends therefrom. Bolt portion, wall, braces and slide body 14 are all integrally formed.

*S S The free end 27 of bolt portion 15 is formed with a bore extending partially therethough as best shown in Figure 4. The bore can house a hardened pin 28 which can be fiied 2d3" into the bore. This prevents an intruder cutting through bolt portion 15 in an attempt to open the door.

The retaining means comprises an abutment member in the form of an annular boss 30 as is best shown in Figure 4.

A guide pin 31 extends above abutment member Slide member 14 is retained in its retracted position as shown in Figure 2 and its extended position as shown in Figure 3 by abutment member 30 in the following manner: Slide member 14 is provided with a pair of abutment member retaining means in the form of spaced recesses 32, 33 as shown in Figures 2 and 3. Spaced recesses 32, 33 extend through slide member 14 and are joined by slot 34. It can be seen from Figure 4 that guide pin 31 can freely slide along slot 34. However, abutment member 30 is of sufficient dimension as are recesses 32, 33 to allow the abutment member to locate within a corresponding recess 32, 33 but unable to pass along slot 34. It should be appreciated that slot 34 is not critical to the functioning of abutment member 30 as a retaining means.

9 Slide member 14 is biased against lock body 12 (and therefore into engagement with abutment member 30) when in the extended and retracted positions by a biasing means in the form of spring 35. Spring 35 is wound around guide pin 31 and extends between a locking cir'olip 36 and a washer 37, the 9 washer abutting against slide member 14. In this manner, spring 35 functions to bias slide member 14 against lock body 12.

2" Slide member 14 is provided with a finger engageable button 38 in the form of a projection having a concave face.

Button 38 extends through slot 18 and is thereby manipulable by an operator's finger.

In use, the lock may be initially oe in its retracted position as shown in Figure 2 and Figure 4. In this retracted position, abutment member 30 locates within recess 33 and spring 35 functions to bias slide member 14 against lock body 12 and thereby prevents slide member 14 from moving 9 to its extended position as shown in Figure 3. To move the slide member, a person presses against portion 38. This pressing movement will lift slide member 14 against the bias of spring 35 sufficiently above lock body 12 to free abutment member 30 from the respective recess 33. Slide member 14 is then able to be slid downwards by the person's finger pushing downwards on button 38. This movement results in slide member 14 now being moved to its extended position as shown in Figure 3 during which guide pin 31 travels along slot 34. When slide member 14 is in its extended position as shown in Figure 3, abutment 30 now locates within recess 32 and spring 35 will S bias slide member 14 back against lock body 12. This in turn results in slide member 14 being unable to be retracted to its retracted position. To retract slide member 14 it is again necessary to depress the slide member by pressing against button 38. This will again raise slide member 14 over abutment member 30 thereby allowing the slide member to now move to its recessed position as shown in Figure 2.

*SSS

To fit the lock to a door as shown in Figure 1, the lower portion of the lock is initially placed in aperture of door 11 such that lip 24 passes along and inside surface of door 11. The lock is then placed against the door and fastener 17 passes through fixing aperture 16 and into a threaded receiving hole 41 to fasten the lock to the door.

It can be appreciated that this fastening method of the lock to the door is simple as .t requires only one screw.

Furthermore, the lock itself is simple in configuration having only one moving part (the slide member). The l.ock can be mounted at an upper end of the door to lock the door against an upper surround frame and/or to a lower end of the door to lock it to a floor surface.

It should be appreciated that various other changes and modifications may be made to the embodiment of described without departing from the spirit and scope of the invention as claimed.

ee o 9o *o e *°o *0

Claims (14)

1. A lock for releasably securing a door and comprising a lock body mountable to adjacent a lower or upper edge of the door, a slide member slidably moveable relative to the lock body and having a bolt portion extending from one end thereof, said slide member being moveable between an extended position where the bolt portion extends from the lock body and is engageable with a keeper to secure the door, and a retracted position where the bolt portion is free from the keeper, a •retaining means to releasably retain the slide member in its extended position and its retracted position, and biasing means to bias the slide member into engagement with the retaining means whereby the slide member can be moved between the retracted and extended positions by 0 initially moving the slide member against the bias of the biasing means to free the slide member from the retaining means and then moving the slide member to the desired extended or retracted position.

2. The lock as claimed in Claim 1, wherein the retaining means comprises an abutment member on one of the lock body or slide member, and the other of the lock body or slide membe3r has a pair of spaced abutment member retaining means, such that when the abutment member is retained by the abutment member retaining means, the bolt portion on the slide member defines its extended position or retracted position. 12

3. The lock as claimed in any one of the preceding claims, wherein the pair of spaced abutment member retairing means comprise recesses configured to accept at least a part of the abutment member.

4. The lock as claimed in any one of the preceding claims, wherein the recesses are on the slide member.

The lock as claimed in any one of the preceding claims, wherein the recesses are joined by a slot, the slot having a configuration different to that of the abutment member such that the abutment member can not pass from one said recess to the other said recess through the slot.

6. The lock a- claimed in any one of the preceding claims, wherein the lock body includes a guide pin which extends through the slot and which can pass between the recesses and along the slot. S.

7. The lock as claimed in any one of the preceding claims, wherein the abutment member comprises a shoulder S located adjacent where the guide pin joins the lock body.

8. The lock as claimed in any one of the preceding 2Cf"* claims, wherein the biasing means is supported relative to the guide pin to bias the slide member against the lock body.

9. The lock as claimed in any one of the preceding claims, wherein the slide member is against a rear surface of the lock body.

10. The lock as claimed in any one of the preceding claims, wherein the lock body comprises a longitudinal slot extending therethrough and which allows access tzo the slide member through a front surface of the lock body to enable the 13 slide member to be moved manually between its extended and retracted positions.

11. The lock as claimed in any one of the preceding claims, wherein one end of the slide body includes an upstanding end wall, and the bolt portion extends from and is fixed to the upstanding end wall.

12. The lock as claimed in any one of the preceding claims, wherein the bolt portion has a free end provided with a bore extending partially therethrough, to accommodate a hardened pin to resist cutting through the bolt.

13. The lock as claimed in any one of the preceding S claims, wherein the lock body has an opening adjacent one end to allow a fastener to pass therethrough, and adjacent the other end is provided with a lip which can engage behind a wall in the door stile, thereby allowing the lock to be *5 fastened to the door stile with a single fastener. 5

14. A lock substantially as hereinbefore described with reference to the accompanying drawings. DATED this Twentyeighth day of September, 1992. WHITCO PTY LTD by their Patent Attorneys CULLEN CO.