AU732357B2 - Multi point lock - Google Patents

Description

S F Ref: 423061

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

00 0 *o l o Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: ASSOCIATED PROVISIONAL [313 Application No(s) P07194 Doric Products Pty Limited 46-48 Redfern Street Wetherill Park New South Wales 2164

AUSTRALIA

Michael Brian Alchin Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Multi Point Lock APPLICATION DETAILS [33] Country

AU

[32] Application Date 4 June 1997 The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5815 MULTI POINT LOCK Technical Field The present invention relates to locks for sliding doors and windows and more particularly but not exclusively to multi point locks for sliding doors and windows.

Background of the Invention Available locks for sliding doors do not provide a lock of economical structure with a satisfactory degree of security. The locks are generally either very simple and therefore insecure or relatively complex and therefore expensive to manufacture.

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

Summary of the Invention There is disclosed herein a lock for a sliding door or window, said lock comprising: a body; a lock tongue pivotally mounted in the body for angular movement about an axis which is to be generally normal to the plane of the door or window and fixed relatively to the body, the tongue being movable between an extended position projecting from within the body and a retracted position spaced inwardly of the body e 20 from the extended position, the tongue having a hook portion; eee a cam member mounted with the tongue so as to be angularly movable about said axis; with a pawl mounted in the body for movement between a first position engaged with the tongue retaining the tongue in the extended position, and a second position permitting movement of the tongue; and wherein said cam member is associated with the pawl so that rotation of the cam member through a predetermined angle will move the pawl to its second position.

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 rear elevation of a lock for a sliding door or window; Figure 2 is a schematic end elevation of the lock of Figure 1; Figure 3 is a schematic front elevation of the lock of Figure 1; Figure 4 is a schematic sectioned end elevation of the lock of Figure 1; [N:\LIBTTI01165:cms Figure 5 is a schematic part exploded perspective view of the lock of Figure 1; Figure 6 is a further parts exploded perspective view of the lock of Figure 1; Figure 7 is a schematic front elevation of a modified form of the lock of Figure 1, which the tongue in the extended position; Figure 8 is a schematic front elevation of the lock of Figure 7, with the tongue in a retracted position; and Figure 9 is a further schematic front elevation of the lock of Figure 7, with the tongue in the extended position.

Detailed Description of the Preferred Embodiment In the accompanying drawings there is schematically depicted a lock 10. The lock 10 has a body 11 providing a handle 12. The body 11 includes a hollow lock housing 13 within which the operating mechanism 14 of the lock is generally contained.

The operating mechanism 14 includes a lock tongue 15 having a hook portion 16 movable between an extended position. (as shown in Figure 1) and a retracted position.

The tongue 15 is rotatable through 900 about an axis which is generally perpendicular to the plane of the door or window and fixed relative to the body 11. The hook portion 16 is moved angularly about this axis between its extended position and a retracted position spaced angularly inwardly from the extended position into the housing 13. In the extended position the hook 16 would engage a striker to retain the door or window in the closed position. The tongue 15 has a lever 17 which is manipulated by the user to cause pivoting of the tongue 15 between its extended position and its retracted position.

The tongue 15 is provided with a central aperture 18 which is-substantially "circular in configuration.

25 Mounted within the aperture 18 is a cam member 19. More particularly the cam member 19 has a cylindrical portion 20 which is received within the aperture 18 so as to support the tongue 15 for movement about the above fixed axis. The edges of the aperture 18 are provided with arcuate recesses 21 which receive radially extending projections 22 on the cam member 19. Cooperation of the recesses 21 and projections 24 permits limited angular movement of the cam member 19 relative to the tongue One extremity of the cam member 19 is provided with a radially extending cam load 23 having a recess 24. That end of the cam member 19 is also provided with an arcuate slot 25. The other end of the cam member 19 is provided with a plurality of gear teeth 26.

The above mentioned tongue 15 is also provided with a generally square or rectangular notch 27 which cooperates with a pawl 28. The pawl 28 is provided with a generally square or rectangular projection 29 which enters the notch 27 when aligned therewith. The pawl 28 also has a cam follower 30 which engages the lobe 23 and [N:\LIBTTI01165:cms

C.

-3enters the recess 24 when aligned therewith. A spring 31 urges the pawl 28 toward the cam member 19.

The operating mechanism 14 is assembled on a base plate 32 of the body 11, which base plate 32 has an circular aperture 33 within which the cam member 19 projects so as to be rotatably supported therein. This also fixes the axis of the tongue relative to the base plate 32 and therefore the body 11. The base plate 32 has projections 34 which engage the door jamb to inhibit lifting of the door to remove the hook 14 from engagement with the striker.

The housing 13 has an aperture 35 aligned with the arcuate recess 25. The aperture 35 would receive a lock cylinder having an end projection received within the arcuate slot 25. Rotation of the cylinder about its longitudinal action by the use of a key would cause movement of the lock projection along the arcuate slot 25. As the projection engaged the extremities of the slot 25, rotation of the lock cylinder would cause rotation of the cam member 19. Rotation of the cam member 19 from the position depicted in Figure 3 would enable the pawl 28 to move into engagement with the notch 27 and therefore retain the lock tongue in extended position.

The cylindrical portion 20 of the cam member 19 projects through the apertures 33 so that the geared teeth 26 are located on the other side of the base plate 32. However, a cover plate 36 is secured to the base plate 32. The geared teeth 26 project through an aperture 53 the cover plate 36 and engage a slide 37. The slide 37 has a rack gear 38 engaged with the gear teeth 26, which geared teeth 26 provide a pinion gear. Rotation of the cam member therefore causes linear movement of the slide 37 in the direction of the arrow 39. The slide 37 is attached to one or more rods 40 by means of an aperture 41 engaged with a pin 42 formed on the slide 37. The or each rod 40 would engage with a striker plate attached to the door head or floor. As an alternative the or each rod 40 would extend to a remote lock assembly which would be activated in unison with operation of the tongue 15. A cover strip 43 would be attached to the door or window so as to cover the rod or rods 40. The door or window to which the lock 10 is attached, would be provided with an aperture aligned with the cam member 19. This door or window aperture would receive a further lock cylinder having an end projection engaged within the aperture 44. Operation of this lock cylinder would then cause pivoting movement of the cam member 19 to move the pawl 28 from engagement within the notch 27 while further rotation will then move the lock tongue 15 from its extended position to its retracted position. This would then release 35 the door for movement. Operation of the lock cylinder in the reverse direction would then move the tongue to the locked position and therefore permit engagement of the pawl 28 in the notch 27 to retain the tongue 15 in the lock (extended) position.

The tongue 15 is limited in its angular movement by engagement with abutment surfaces 44 and 45 which are the extremities of a slot 46. The upper surface (N:\LIBTTIO1165:cms

I

-4- 44 abuts the handle 17 when the tongue is in its extended position. When the tongue is in the retracted position the handle 17 abuts the surface k A toggle mechanism 47 urges the tongue 15 to the extended or retracted position. The toggle mechanism 47 includes a post 48 through which there slidably passes a guide rod 49. The guide rod 49 terminates with a socket 50 which engages a pivot member 51 of the tongue 15. The pivot member 51 is slidably received with the socket 50 for sliding movement relative thereto. A spring 52 extends between the post 48 and the socket member 50. When the tongue 15 pivots from its extended position, the spring 52 is compressed until it reaches a position at which the toggle mechanism reaches an "over centre" position and urges the tongue 15 to its retracted position. The reverse happens when the tongue 15 is being pivoted from its retracted position to its extended position.

By operation of either lock cylinder, the cam member 19 can be moved to a position rendering the pawl 28 inoperative that is, spaced from engagement with the tongue 15. A user of the lock 10 can then manipulate the handle 17 to move the tongue between its extended position and its retracted position. When the pawl 29 is engaged with the tongue 15, operation of either lock cylinder will cause rotation of the cam member 19 to move the pawl 28 from engagement with the tongue 15. Initially the tongue 15 would not move due to the loss motion between the projections 22 and the arcuate recesses 21. However, the projections 22 eventually engage one of the extremities of each of the arcuate recesses 21 so that further movement of the lock cylinders will cause movement of the tongue In Figures 7 to 9, there is schematically depicted a modified form of the lock of Figures 1 to 6. In this embodiment, the pawl 28 slidebly engages a slot 53 formed in the base plate 32. More particularly, the pawl 28 includes a generally square or rectangular body 54 which includes a projection extending into the slot 53.

The embodiment of Figure 1, as well as the embodiment of Figure 7, both 0*include elongated slots 55 which receives fasteners to secure the lock 10 to the door or window. The slots 55 are elongated in the direction of extension of the projections 34 and provide for positioning adjustment of the lock tongue relative to the door jam and/or a striker plate.

oo•** 0o0 IN:\LIBTT1oI 165:cms

Claims (9)

1. A lock for a sliding door or window, said lock comprising: a body; a lock tongue pivotally mounted in the body for angular movement about an axis which is to be generally normal to the plane of the door or window and fixed relatively to the body, the tongue being movable between an extended position projecting from within the body and a retracted position spaced inwardly of the body from the extended position, the tongue having a hook portion; a cam member mounted with the tongue so as to be angularly movable about 1o said axis; a pawl mounted in the body for movement between a first position engaged with the tongue retaining the tongue in the extended position, and a second position permitting movement of the tongue; and wherein said cam member is associated with the pawl so that rotation of the cam member through a predetermined angle will move the pawl to its second position.

2. The lock of claim 1, wherein said body includes a base plate provided with a generally circular aperture, and said cam member has a cylindrical portion mounted in the base plate aperture to fix said axis relative to said base plate.

3. The lock of claim 2, wherein said pawl is mounted on said base plate for movement relative thereto between the pawl first and second positions.

4. The lock of claim 1, 2 or 3, wherein said cam member is provided with an arcuate slot extending about said axis, with said arcuate slot being adapted to be *engaged to a lock cylinder to cause rotation of said cam member about said axis. The lock of any one of claims 1 to 4, wherein said cam member includes a lobe to engage said pawl, said lobe being provided with a recess within which the pawl engages.

6. The lock of any one of claims 1 to 5, wherein said lock tongue has a o notch which is engaged by the pawl when the pawl is in the first position thereof, said pawl having a projection to engage within the notch.

7. The lock of any one of claims 1 to 6, further including a toggle 0%mechanism which urges said tongue to said extended position or to said retracted ***position.

8. The lock of claim 7, wherein said toggle mechanism includes a projection mounted on said tongue, a guide rod slidably mounted on the body and having a socket engaged with the tongue projection, and a spring tensioned and engaging a slot to urge the tongue to the extended position or the retracted position.

9. The lock of anyone of claims 1 to 8, wherein said tongue is provided with a hook portion. [N:\LIBTTIO1 165:cms The lock of any one of claims 1 to 9, further including a spring urging the pawl to engage with the cam member.

11. A lock, substantially as hereinbefore described with reference to Figures 1 to 6, or 7 to 9 of the accompanying drawings. Dated 1 June, 1998 Doric Products Pty Limited Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON [N:\LIBTT01 165:cms