AU693956B2 - Window lock - Google Patents

Description

wi Is~ Regulation 32

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

(ORIGINAL)

Name of Applicant: Gainsborough Hardware Industries Limited

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rr~r r r at er ori ro r rs o o rc~r r o Actual Inventor(s): SP usoAddress for Service: DAV S Address for Service: DAVIES C S C AVE. Patnt Attflevsr A PArcT c-ro-: A-IZK- "/-rro E S-/ 1 Little Collins St Tw MMd 300.

r-F 1'4AR-/ 114 g YFi?--P, Mn- Pl Sl Sv-DNaC /NSVj oo00 Window Lock Invention Title: 44 444*44 444444 Details of Associated Provisional Application(s): No(s): PM9991/94 filed 9 December 1994 The following statement is a full description of this invention, including the best method of performing it known to me/us: -1la WINDOW LOCK The present invention relates to a lock device especially suitable for selectively latching or locking windows or sliding doors.

Existing commercial window locks typically include a housing of generally rectangular configuration with a locking pin slidable through the housing, and a simple key actuated cylinder lock. A lock of this form is usually attached to a window casement, sash or awning which is then locked against movement when the locking pin is engaged through a registering aperture in another casement, sash or awning or in a frame component of the window.

With most of these locks, the setting of the cylinder lock determines whether or not the locking pin can be moved. Hence, although the lock may usually be left in an unlocked condition to allow the window to be conveniently opened or closed, the key must be found and applied in order to lock the window.

1It is an object of the invention to overcome this disadvantage in a simple and effective manner.

The invention accordingly provides a lock device especially suitable for windows and sliding doors, including: a body; means to attach the body to a surface of a window or door assembly; an elongate latch member mounted for sliding movement longitudinally of the latch member through the body between a latching position in which the latch member extends from the body for engaging a part of the window or door assembly and a release position in which the latch member is withdrawn clear of its latching position, which latch member is movable by hand between the latching and release positions; a slide means retained within said body for movement transversely of said latch member between a first position in which it interacts with said latch member and a second position clear of such interaction; said interaction including locking the latch member at its latching position but at the latch member's release position being movable aside by longitudinal movement of the latch member to permit the latch member to be moved from its release to its latching position; and lock means disposed in or on the body and engageable with the slide means to prevent said moving aside when said latch member is at its latching position and said lock means is locked and to hold said slide means out of its interaction position when said lock means is not locked.

(N:\LIBd]0501:DMB ;ij;w _I 2 The elongate latch member is preferably a solid pin or rod freely slidable in a complementary passage in said body.

The slide means is preferably a plate biased, for example by a helical compression spring, to its interaction position. The engagement between the lock means and this slide plate is advantageously by means of a pin rotatable with a lock cylinder of the lock and engageable with a matching slot in the plate.

Preferably, the interaction between the slide plate and the latch member is by way of respective spaced annular grooves in the latch member and a curved edge defined by a recess in the plate. The groove defining the release position of the latch member may, for example, have a frustoconical shoulder effective to push the slide plate against the aforesaid biasing means when the latch member is moved longitudinally by hand from its release position towards its latching position.

Means is preferably provided to prevent complete withdrawal of the latch member from the body while accommodating its sliding movement between its latching and release positions. Such means may comprises, for example, a transversely slidable spring loaded detent engageable with the aforementioned groove in the latch member S' with the frustoconical shoulder, to prevent further withdrawal of the latch member from its release position.

The invention will now be further described, by way of example only, with reference to the accompanying drawings, in which: Sthe," Figure 1 is an isometric view of a window lock according to an embodiment of the invention, suitable for application to an awning or casement window; 4 t -4 i 1 §it N:ALIBdlO0501:DMB l -3- Figure 2 is a corresponding exploded view of the lock shown in Figure 1; Figure 3 is a longitudinal central cross-section of the lock; Figure 4 is an underneath view, with the back cover plate removed, showing the condition of the assembly when the cylinder lock is in its locked state; and Figure 5 is a view similar to Figure 4 but showing the condition of the assembly when the cylinder lock is in its unlocked state.

The illustrated lock 10 includes a housing 12 having a cast metal body of generally rectangular configuration, an elongate latch member in the form of a solid metal latch pin 14, and lock means in the guise of a standard key-actuated cylinder lock 16. Housing 12 includes means to attach the body to a surface consisting of an array of screw apertures 18 to receive counter-sunk screws for fastening the lock housing 12 onto a surface engaging its top or bottom faces 13a or 13b, or its back face 13c.

Si Latch pin 14 and cylinder lock 16 are disposed in respective matching cylindrical bores 20,21 in housing 12. The latch pin has a knurled head portion 15 by which it may be longitudinally slid fore and aft between a latching position in which it extends from rear surface 13c for engaging an aperture in a window casement, awning or frame component, with the knurled portion just protruding from the front end of bore 20, and a release position in which the pin is drawn in behind rear face 13c and projects from the front of the lock housing. The latter position is depicted in Figure 1.

*i The rear face 13c of housing 12 is defined by a removable back cover plate 22 which rests on an outermost level 25a of a rear cavity 24 and is retained in place by a pair of screws engaged through apertures 23. Cover plate 22 includes an aperture in register with bore 20 and holes 18a matching screw apertures 18. Immediately inwardly of the cover plate 22, is a slide plate 26 which is slidable over a small distance at a more inward level 25b of cavity 24 between limits defined by the engagement of the opposite end edges of the plate with the end shoulders 27 of the inner level. Plates 951211,p:\oper\gjn,ock.cap,3 -4- 22,26 may include registering holes 65,66 to aid in the removal of the key cylinder when desired.

Slide plate 26 is cut away at one end to define a semi-circular recess 28. At one of its extreme positions, to which it is biased by a longitudinal compression spring the rim 29 of recess 28 is receivable within an annular groove 32 of latch pin 14 which is of a width just sufficient to accommodate the width of the plate. This interaction between the plate and latch pin defines the latching position of latch pin 14 and, because groove 32 has radial sides, is effective to lock the latch pin against movement back to its release position. Spring 30 is housed within a matching slot 34 in body 12 and acts between the end of this slot and a transversely bent integral tab 35 of plate 26.

Close to the tip 14a of latch pin 14 is a further and somewhat wider annular groove 36 defined between a radial shoulder 37 adjacent the pin tip and a frustoconical shoulder 38, inclined at 450, on the other side. When plate 26 is at its interaction position but with rim 29 received in groove 36, this defines the release position of latch pin 14. The interaction differs, however, from the interaction at groove 32 in that, if latch pin 14 is pushed forward by hand, frustoconical shoulder 38 pushes plate 26 transversely aside against spring 30 to allow the pin to be moved fully to its latching 20 position.

The operative position of slide plate 26 is determined by the engagement between the slide plate and cylinder lock 16. As is commonly the case, the rear face of the rotatable cylinder of the lock has a short cylindrical lug 40 which protrudes into a closed 25 partially crescent-shaped slot 42 in plate 26. Lug 40 moves through a 900 arc between :a a, the locked state of the cylinder lock and its unlocked state. Slot 42 is precisely located and shaped so that, when the cylinder lock is in its unlocked condition (Figure lug firmly engages one end of slot 42 and holds the plate in its non-interacting position with rim 29 clear of the path of travel of latch pin 14. When the lock is in its locked state (Figure on the other hand, lug 40 is adjacent but not quite at the other end of slot 42 so as to allow the plate to move between its interacting and non-interacting positions. Thus, while the spring 30 will now ensure a locking engagement of the plate 95121 1,p:\oper\gjn,lock.cap,4 in groove 32, the plate can be moved aside sufficiently from groove 36 to allow the latch pin to be moved from its release to its latching position, notwithstanding the fact that the cylinder lock 16 is in its locked state.

When the cylinder lock 16 is in its locked state and latch pin 14 is in its release position, further withdrawal of the latch pin from housing 12 is prevented by engagement of radial groove shoulder 37 with spring-loaded slide plate 26. However, if the cylinder lock is in its unlocked state, this interaction does not occur and a separate means 50 is accordingly provided to prevent complete withdrawal of latch pin 14 from housing 12 at this setting. Means 50 comprises a detent 52 which is slidably mounted in a slot 54 of cavity 24 extending radially with respect to the latch pin 14. The head 53 of this detent is of a width and shape to match the width and axial configuration of groove 36, including an oblique face 59 to match shoulder 38. The rear of detent 52 is forked at 54 to house a helical compression spring 56 which will bias the detent into groove 36 and prevent the latch pin from being withdrawn because of the engagement of radial shoulder 37 with the flat side edge of the detent. On the other hand, when it is desire to push the latch pin inwardly towards its latching position, the matching inclinations of shoulder 38 and detent head 53 ensure that the detent is pushed back against spring 56 to allow movement of the latch pin.

oo* It will be appreciated that the described and illustrated window lock has the advantage of being of a generally familiar form and operation and yet has the additional feature that the keyed cylinder lock 16 may be promptly relocked after being disengaged to allow withdrawal of latch pin 14, but the latch pin can be subsequently pushed back 25 to its latching position, in which the window is locked, without any need to find the key and disengage the keylock. This facility is provided in a simple and effective construction.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.

951211

Claims (9)

1. A lock device especially suitable for windows and sliding doors, including: Sa body; means to attach the body to a surface of a window or door assembly; an elongate latch member mounted for sliding movement longitudinally of the latch member through the body between a latching position in which the latch member extends from the body for engaging a part of the window or door assembly and a release position in which the latch member is withdrawn clear of its latching position, which latch member is movable by hand between the latching and release positions; a slide means retained within said body for movement transversely of said latch member between a first position in which it interacts with said latch member and a second position clear of such interaction; o said interaction including locking the latch member at its latching position but oo 15 at the latch member's release position being movable aside by longitudinal movement of the latch member to permit the latch member to be moved from its release to its o°latching position; and lock means disposed in or on the body and engageable with the slide means to .prevent said moving aside when said latch member is at its latching position and said lock means is locked and to hold said slide means out of its interaction position when 0 o said lock means is not locked. 0

2. A lock device according to claim 1 wherein said elongate latch So member includes a solid pin or rod freely slidable in a complementary passage in said body.

3. A lock device according to claim 1 or 2 wherein said slide means includes a slide plate biased to its interaction position. S=

4. A lock device according to claim 3 wherein said slide plate is biased to its interaction position by a helical compression spring.

A lock device according to claim 3 or 4 wherein engagement between i 30 the lock means and said slide plate is by means of a pin rotatable with a lock cylinder of the lock engageable with a matching slot in the plate.

6. A lock device according to claim 3, 4 or 5 wherein said interaction between the slide plate and the latch member is by way of respective spaced annular grooves in the latch member and a curved edge defined by a recess in the plate.

7. A lock device according to claim 6 wherein the groove defining the release position of the latch member has a frustoconical shoulder effective to push the slide plate against the aforesaid biasing means when the latch member is moved longitudinally by hand from its release position towards its latching position. [N:\LIBd]0501 :DMB C c ~*uarrrrn7

8. A lock device according to any preceding claim further including retention means to prevent complete withdrawal of the latch member from the body while accommodating its sliding movement between its latching and release positions.

9. A lock device according to claim 7 and 8 wherein said retention means includes a transversely slidable spring loaded detent engageable with the aforementioned groove in the latch member with said shoulder, to prevent further withdrawal of the latch member from its release position. A lock device according substantially as hereinbefore described with reference to the accompanying drawings. DATED this Nineteenth Day of May 1998 Gainsborough Hardware Industries Limited Patent Attorneys for the Applicant/Nominated Person 000 15 SPRUSON FERGUSON 0 o 0 o0 o° i o a e a IN:\LIBdI00501:DMB I 1 -8- ABSTRACT A lock device especially suitable for windows and sliding doors, including: a body; means to attach the body to a surface of a window or door assembly; an elongate latch member movnted for sliding movement longitudinally of the latch member through the body between a latching position in which the latch member extends from the body for engaging a part of the window or door assembly and a release posit in which the latch member is withdrawn clear of its latching position, which latch member is movable by hand between the latching and release positions; a slide means retained within said body for movement transversely of said latch member between a first position in which it interacts with said latch member and a second position clear of such interaction; said interaction including locking the latch member at its latching position but at the latch member's release position being movable aside by longitudinal movement of the latch member to permit the latch member to be moved from its release to its latching position; and lock means disposed in or on the body and engageable with the slide means to prevent said moving aside when locked and to hold said slide means out of its interaction position when not locked. II ar a a. a ira• It 951211,p:\oper\gjnIocIcap,8