AU692195B2 - A sliding door lock - Google Patents

Description

1 A Sliding Door Lock Technical Field The present invention relates to locks for sliding doors and windows.

Background of the Invention Known locks for sliding doors and windows include a lock tongue which pivots about an axis generally normal to the plane of the door or window. The lock tongue is of a "hook" configuration, with the hook portion thereof movable between an extended position projecting from within the lock housing, and a retracted position. Various mechanisms have been devised to enable a user of the lock to move the lock tongue between the extended and retracted positions. However, previously known locks have not provided the degree of security required for a reasonable cost of manufacture of the lock.

A particular problem with sliding door and window locks is adjustment of the lock tongue in order to accommodate the gap between the door edge and the adjacent 15 jamb. It should be appreciated that the tongue is moved relative to the lock body in order to adjust the position of the lock tongue. If the gap is excessive the door can be lifted to disengage the tongue from the jamb. This obviously detracts from the security of the lock.

o Object of the Invention 20 It is the object of the present invention to overcome or substantially ameliorate the above disadvantages.

*go• Summary of the Invention 00o o.

0, There is disclosed herein a lock for a sliding door, said lock comprising: a base to be fixed to the door; a lock tongue mounted on the base for pivoting movement between an extended engaging position and a retracted position, said tongue being pivotable about an axis which is to be generally normal to a major surface of the door said axis being fixed stationary with respect to the base; and wherein said base has at least one projection extending in a direction generally normal to said axis and also extending generally in the direction of extension of said tongue when said tongue is in said engaging position, the projection being adapted to engage a door jamb associated with the door to inhibit lifting of the door to disengage the tongue, said base further having a pair of apertures through which fasteners may pass to secure the lock to the door, which apertures are elongated in the direction of extension of the base IN:\LIBTTO1O439:PVH L dl projection to provide for location adjustment of the lock, which adjustment entails movement of the base and therefore movement of the projection with the tongue.

Brief Description of the Drawings A preferring 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 front elevation of a lock for a sliding door or window; Figure 2 is a schematic front end elevation of the lock of Figure 1; Figure 3 is a schematic plan view of the lock of Figure 1; Figure 4 is a schematic rear elevation of the lock of Figure 1; Figure 5 is a schematic parts exploded perspective view of the lock of Figure 1; Figure 6 is a schematic front elevation of She central operating mechanism of the S: lock of Figure 1; Figure 7 is a schematic front elevation of the mechanism of Figure 6 arranged in a further configuration; and Figure 8 is a schematic perspective view of the mechanism as illustrated in Figure .7.

Detailed Description of the Preferred Embodiment In the accompanying drawings there is schematically depicted a lock 10 to be g mounted on a sliding door or window, The lock 10 has a base 11 and an outer cover 12 provided with a handle 13. The outer cover 12 has a cover base 14 from which there ooo o•* N:\LIBIO1439:PVH 3 extends the handle 13. The cover base 14 is molded fiom plastics material and is formed integral with a centre portion 15 of the handle 13. The centre portion 15 is of a "X" transverse cross section.

Molded so as to be complementary to the shape of the centre portion 15, there is provided two cover members 16 which cooperate to define a cavity complementary to the cross section of the centre portion 15. The cover members 16 may be molded of suitable material to give the handle 13 the correct "feel".

Cover panels 22 may be provided to enhance the appearance of the handle 13.

The lock 10 includes a tongue member 23 having a centre annular portion 24 from which there projects and is integrally formed therewith, a tongue 25 which is of a "hook" configuration. The tongue member 23 is angularly movable about a longitudinal axis 26 extending centrally through the centre annular portion 24 and generally normal to the plane of the tongue member 23. Angular movement of the tongue member 23 moves the tongue 24 from an engaging position (as best seen in Figure 3) extending from within the lock 10, and a retracted position with the tongue 25 located entirely (or at least substantially) within the lock 10. In the extended (engaging) position, the tongue 24 engages a striker to retain the door or window in the closed position. In the retracted position, the lock 10 releases the door or window for movement.

The tongue member 23 is rotatably mounted on the base 11 by means of a follower ili 27. The follower 27 has an annular flange 28 which abuts the surface 63 of the tongue member 23. More particularly, the tongue member 23 is located between the follower flange 28 and the base 11. The follower 27 has a cylindrical portion 29 which projects OVOO: through the central circular aperture 30 of the tongue member 23 so that the tongue member 23 is sandwiched between the flange 28 and the base 11. A spacer or washer 31 abuts the follower 23 and the base 11. Alternatively, the washer 31 may be located between the tongue member 23 and the flange 28, Accordingly the position of the tongue member 23 along the axis 26 may be adjusted by location of the washer 31.

The cylindrical portion 29 projects through the circular aperture 32 in the base 11, with the extremity of the cylindrical portion 29 having a groove to receive a CirclipTM 33, The CirclipTM 33 retains the tongue assembly 64 consisting of the follower 28, tongue member 23 and washer 31, attached to the base 11 but permitting movement of that °assembly 64 about the axis 26. This thereby fixes the axis 26 stationary with respect to the base 11.

Mounted in the cover base 14 is a cylinder lock assembly 34 having a barrel The barrel 35 has an end flange 41 which abuts the outer surface 37 of the base 14 so that the cylindrical portion 36 of the barrel 35 projects through the passage 38 of the base 14.

Surrounding the cylindrical portion of the barrel 35 is the cylinder lock outer body 39.

The barrel 35 is key operable and has its inner end (that remote from the flange 36) provided with an eccentrically positioned projection. The projection is spaced from the IN:\LIBTT00OO73:LMM ~I II I 9 1 axis 26 which is also the longitudinal axis of the barrel 35. Accordingly rotation of the barrel 35 causes angular movement of the barrel projection about the axis 26.

The follower 27 has an angularly extending slot 40, within which the end projection of the barrel 36 projects. The slot 24 has end surfaces 42 and 43 which are selectively abutted by the projection of the barrel 36. Accordingly key operation of the barrel 36 to cause rotation thereof will also cause rotation of the follower 27 when the projection of the barrel 35 abuts one of the end faces 42 or 43.

Extending from the follower 27 is a first abutment in the form of a projection 44, as well as a second abutment in the form of an abutment portion The tongue member 23 has a projection 46 with a curved outer surface. Engaging the projection 46 is a socket 47. Fixed or formed integral with the socket 47 is a guide rod 48 about which there is wound a spring 49. The spring 49 abuts the socket 47. The socket 47 is pivotable on the projection 46.

The base 11 is formed with a guide 50 which defines a linear path. Received within the guide 50 is a slide 51 which is retained by the guide 50 and is movable along the linear path defined thereby. The slide 50 has a base 52 from which there extends two abutment portions in the form of projections 53 and 54.

The base 11 is also formed with a pair of projections 54 against which the spring 49 bears in order to be retained in compression. Eyelets 55 are provided and project into the handle 12 and through which the screws 20 pass to retain the base 11 fixed to the handle 12. The screws 20 engage the nuts 18 located in the slots 19 formed in the handle base 14.

The tongue member 23 is also provided with a projection 56 to the extremity of which there is fixed a cover 57. The cover 57 is located outside of the base 14 and moves in the recess 58. The projection with its cover 57 acts as an operation handle.

:i The end face 59 of the cylindrical portion 29 of the follower 27, has a shaped recess 60 (best seen in Figure 3) which receives the extremity of a handle placed on the other side of the door or window so that operation of the handle will cause movement of the follower 27 and therefore the tongue member 23.

When the above lock 10 is assembled, operation of the tongue member 23 will take with it the follower 27 by engagement of the projection 44 with the projections 53 and 54.

During normal operation the projection 44 is aligned with the projection 56. A user of the lock 10 will grip the cover 57 and move it angularly about the axis 26. With reference to Figure 6, if the cover 57 is moved anti-clockwise, the tongue 25 will be moved from the position illustrated in Figure 6 to a position located within the housing 14. This will then free the door or window for movement. If the cover 57 is then moved in the opposite direction, the tongue 25 is again moved to the position of Figure 6 engaging a striker member or other item which will then retain the door or window in the closed position. The handle on the opposite side of the door will perform the same functions. Operation of this other handle will cause rotation of the follower 27. The IN:\LBlTT]OOO73:LMM I _III projection 44 will cause movement of the slide 51 by engagement of the projection 54 if the follower 27 is moved anti-clockwise (with reference to Figure If the handle is moved in the opposite direction, the abutment portion 45 will engage the projection 54 and cause movement of the slide and therefore movement of the tongue member 23 to move the tongue member 23 in the clockwise direction (with reference to Figure 6) to thereby move the tongue 25 to the position depicted in Figure 6.

To disable the lock 10 with respect to operation of the tongue 25 by movement of the cover 57, a key is inserted in the barrel 41 and rotated to cause relative movement between the follower 27 and tongue member 25 so that the projection 44 is angularly displaced from the projection 56 (as best seen in Figures 7 and If an attempt is then made to move the tongue 25 from the extended engaging position to the retracted position within the lock 10, by operation of the cover 57, the projection 44 will engage the projection 53 to prevent movement of the tongue member 23. This is achieved by the projection 56 attempting to cause movement of the slide 51 by engagement with the projection 54. However also engaged with the projection 54 is the abutment portion and therefore movement of the slide 51 will cause movement of the follower 27. Initial movement of the slide 51 will move the projection 53 to a position whereat the projection 44 can no longer move to a position between the projections 53 and 54. Subsequent movement of the follower 27 by movement of the projection 56 will merely cause too. abutment of the projection 44 against the projection 53. Further movement of the slide 51 is then prevented as the follower 27 is jammed from angular movement, Accordingly the S lock 10 is in a "locked" configuration with the tongue 25 engaged with the striker. The to: door or window is therefore maintained in a closed position. The follower 27 is moved to displace the projection 44 angularly from between the projections 53 and 54 by the offset projection on the inner end of the barrel 35 engaging one of the faces 42 or 43.

Again by operation of the key, the barrel 35 can be operated to return the projection 44 to alignment with the projection 56 thereby permitting operation of the lock 10 by operation of the cover 57.

The two set positions of the tongue member 23, that is with the tongue 25 in the extended locked position or the release retracted position, are defined by the extremities of the movement of the slide 51. The tongue member 53 is biased to its two positions by the spring 49. The spring 49 acts as an "overcentre" mechanism either biasing the tongue to the extended position or biasing the tongue 25 to the retracted position. The spring 49, by moving the tongue member 23 to its retracted position, also moves the slide 51 to a position at which the projection 53 clears the way for movement of the projection 44 to be aligned with the projection 56 by operation of the key.

As best seen in Figures 5 and 6, the base 11 has a pair of projections 61 which are provided to engage the surrounding door jamb to prevent lifting of the door and disengagement of the tongue member 23. The base 11, again as best seen in Figures and 6, has a pair of slots 62. The slots 62 allow threaded fasteners to pass therethrough IN:\LIBTl0073:LMM Ir I I b 6 to fix the base 11 to the door. The slots 62 are elongated to allow for adjustment of the lock 10 (tongue member 23) relative to the door and jamb. The tongue member 23, by being fixed to rotate about the axis 26 therefore moves with the projections 61 during adjustment of the lock position. The projections 61 extend into the door jamb to prevent lifting of the door to disengage the tongue member 23 from the door jamb.

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Claims (2)

1. A lock for a sliding door, said lock comprising: a base to be fixed to the door; a lock tongue mounted on the base for pivoting movement between an extended engaging position and a retracted position, said tongue being pivotable about an axis which is to be generally normal to a major surface of the door said axis being fixed stationary with respect to the base; and wherein said base has at least one projection extending in a direction generally normal to said axis and also extending generally in the direction of extension of said tongue when said tongue is in said engaging position, the projection being adapted to engage a door jamb associated with the door to inhibit lifting of the door to disengage the tongue, said base further having a pair of apertures through which fasteners may pass to secure the lock to the door, which apertures are elongated in the direction of extension of the base projection to provide for location adjustment of the lock, which adjustment 15 entails movement of the base and therefore movement of the projection with the tongue.

2. The lock of claim 1, wherein said base has a pair of projections, which projections are spaced on opposite sides of the lock tongue. A lock substantially as hereinbefore described with reference to the accompanying drawings. 20 Dated 20 April, 1998 Alchin Long Group Pty Ltd t/as Doric Products Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON 1N:\LIB101439:PVH A SLIDING DOOR LOCK Abstract A lock (10) for a sliding door or window. The lock (10) includes a base (11) which rotatably supports a "hook" tongue The tongue (25) is movable between an extended locking position and a retracted position. To maintain the lock tongue (25) in the extended position, there is provided a slide (51) with a pair of projections (53, 54). The projection (53) engages a projection associated with the lock tongue (25) to maintain the lock tongue (25) in the extended posiuon. Fig. 6 *s e s* e 0 C 0* me 0 *0 6 IN: LIBTT;00073:LMM I= la