GB2132684A

GB2132684A - Security casement-window-stay

Info

Publication number: GB2132684A
Application number: GB08235649A
Authority: GB
Inventors: Guy Samuel Phillips
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-12-14
Filing date: 1982-12-14
Publication date: 1984-07-11

Abstract

A casement-window-stay in which a slot 9 is provided at the pivot end. A large hole 2 at the pivot end of the slot allows the head 13 of the stud 12 to pass through. The slot 9, being slightly wider than the stud diameter 14, allows the arm to move to the end of the slot where the stud diameter 15 engages in the hole 4. In this way, the window may be left open for ventilation while preventing unauthorised persons, outside the building in which the windows are built, from lifting the stay arm off the stud and fully opening the window: The stay can only be lifted when the window is in the fully closed position. <IMAGE>

Description

SPECIFICATION Security casement window stay The invention concerns improvements in or relating to casement stays, and in particular but not exclusively to those stays used to position windows whose purpose when opened is to admit airforventilation.

Afirstpriorart method of constructing casement stays employs a length of metal strip either solid or of 'U' shaped section. In each case a substantiallyflat surface is provided along whose length holes are drilled at regular intervals. This metal strip is attached at one end to the window surround by a joint allowing movement in the vertical and horizontal planes. By engaging any one of the holes in this metal strip with a stud vertically mounted on the lower part ofthe window frame, the window may be arrested in any one of a number of discrete open positions.

A second prior art method of constructing casement stays employs a length of solid flat metal strip attached at one end to the window surround by a joint allowing movement in the horizontal plane. This strip is loosely encased by a rectangular section metal tube, one end of the tube being attached to the window frame by a joint allowing movement in the horizontal plane. As the window is opened the metal strip slides within the metal tube. A screw acting through a threaded hole in the tube can be adjusted so as to abut the metal strip so acting as a clamp and preventing further relative movement between the strip and the tube. The window may be arrested in an infinite number of positions within a range limited bythe lengths ofthe metal strip and tube.

A disadvantage of these prior art methods is that whilst retaining the window in the desired open position against the forces imposed by winds, they are not able to secure the window against opening by unauthorised persons acting from the outside of the building in which the windows are built. The purpose ofthe invention is to alleviate this disadvantage.

According to the present invention there is provided a method of manufacturing a window casement stay such thattwo distinct patterns of locating holes are drilling through the metal strip forming the stay. Each of the two groups of holes consists of one large diameter hole and one or more holes of smaller diameter. A slot, whose width is less than the diameter ofthe smaller holes, is cut in the metal strip so as to connect all the holes in each group.

A cylindrical holding stud, having three diameítersS is mounted on the window frame. The top diameter slightly less than the diameter ofthe large diameter holes in the stay, the centre diameter is slightly less than the width of the slot in the stay, and the bottom diameter is slightly less than the diameter of the small holes in the stay.

The stay engages the stud by positioning one of the two large diameter holes overthe stud head, lowering the stay until the slot corresponds to the centre diameter ofthe stud, then opening the window until the desired smaller diameter hole in the stay is positioned overthe bottom diameterofthe stud.

Lowering thestayto engagethestud then positions the window.

lfthe first group of holes in the stay, consisting of one large and one small, be selected it will not be possible to open the windowfurther orto disengage the stey by persons on the outside of the building. The stay may be disengaged only when the window is fully closed.

An embodiment ofthe invention will now be described by way of example only with reference to the accompanying drawing.

A casement stay (1) has a pattern of holes drilled in it such that holes (2 and 3) are of a large diameter. Holes (4, 5, 6, 7 and 8) are of a smallerdiameter. The holes are interconnected by slots (9 and 10) whose width is less than the diameter of hole (4through to 8).

A cylindrical locking stud (11) attached to a fixing plate (12) has three diameters (13), (14) and (15).These diameters are slightly less than the diameters of the holes (2 and 3), the widths of slots (9 and 10), and of the diameters of holes (4through to 8), respectively.

If the stud head (13) is so arranged as to engage hole (2) when the window is closed, then the window may be opened by allowing the slot (9) to engage in the stud diameter (14) and arrested by allowing the hole (4) to engage with stud diameter ( 15) .

In this position it is not possible to further open the window, and because the stay head (13) is larger than locating hole (4) the stay cannot be lifted up to disengage from the locking stud until the window is again fully closed. This prevents the window from being further opened by unauthorised persons acting from the outside of the building.

CLAIMS (filed on 14-12-83) 1. A secu rity-casement-window-stay comprising a conventional stay with a short, longitudinal slot at the pivot end which, in the manner of a door chain, prevents unauthorised persons outside the building in which the windows are built from opening the windows widerand gaining access.

2. A security casement-window-stay as claimed in Claim 1 above which additionally allows full opening of the windows in a conventional manner.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Security casement window stay The invention concerns improvements in or relating to casement stays, and in particular but not exclusively to those stays used to position windows whose purpose when opened is to admit airforventilation. Afirstpriorart method of constructing casement stays employs a length of metal strip either solid or of 'U' shaped section. In each case a substantiallyflat surface is provided along whose length holes are drilled at regular intervals. This metal strip is attached at one end to the window surround by a joint allowing movement in the vertical and horizontal planes. By engaging any one of the holes in this metal strip with a stud vertically mounted on the lower part ofthe window frame, the window may be arrested in any one of a number of discrete open positions. A second prior art method of constructing casement stays employs a length of solid flat metal strip attached at one end to the window surround by a joint allowing movement in the horizontal plane. This strip is loosely encased by a rectangular section metal tube, one end of the tube being attached to the window frame by a joint allowing movement in the horizontal plane. As the window is opened the metal strip slides within the metal tube. A screw acting through a threaded hole in the tube can be adjusted so as to abut the metal strip so acting as a clamp and preventing further relative movement between the strip and the tube. The window may be arrested in an infinite number of positions within a range limited bythe lengths ofthe metal strip and tube. A disadvantage of these prior art methods is that whilst retaining the window in the desired open position against the forces imposed by winds, they are not able to secure the window against opening by unauthorised persons acting from the outside of the building in which the windows are built. The purpose ofthe invention is to alleviate this disadvantage. According to the present invention there is provided a method of manufacturing a window casement stay such thattwo distinct patterns of locating holes are drilling through the metal strip forming the stay. Each of the two groups of holes consists of one large diameter hole and one or more holes of smaller diameter. A slot, whose width is less than the diameter ofthe smaller holes, is cut in the metal strip so as to connect all the holes in each group. A cylindrical holding stud, having three diameítersS is mounted on the window frame. The top diameter slightly less than the diameter ofthe large diameter holes in the stay, the centre diameter is slightly less than the width of the slot in the stay, and the bottom diameter is slightly less than the diameter of the small holes in the stay. The stay engages the stud by positioning one of the two large diameter holes overthe stud head, lowering the stay until the slot corresponds to the centre diameter ofthe stud, then opening the window until the desired smaller diameter hole in the stay is positioned overthe bottom diameterofthe stud. Lowering thestayto engagethestud then positions the window. lfthe first group of holes in the stay, consisting of one large and one small, be selected it will not be possible to open the windowfurther orto disengage the stey by persons on the outside of the building. The stay may be disengaged only when the window is fully closed. An embodiment ofthe invention will now be described by way of example only with reference to the accompanying drawing. A casement stay (1) has a pattern of holes drilled in it such that holes (2 and 3) are of a large diameter. Holes (4, 5, 6, 7 and 8) are of a smallerdiameter. The holes are interconnected by slots (9 and 10) whose width is less than the diameter of hole (4through to 8). A cylindrical locking stud (11) attached to a fixing plate (12) has three diameters (13), (14) and (15).These diameters are slightly less than the diameters of the holes (2 and 3), the widths of slots (9 and 10), and of the diameters of holes (4through to 8), respectively. If the stud head (13) is so arranged as to engage hole (2) when the window is closed, then the window may be opened by allowing the slot (9) to engage in the stud diameter (14) and arrested by allowing the hole (4) to engage with stud diameter ( 15) . In this position it is not possible to further open the window, and because the stay head (13) is larger than locating hole (4) the stay cannot be lifted up to disengage from the locking stud until the window is again fully closed. This prevents the window from being further opened by unauthorised persons acting from the outside of the building. CLAIMS (filed on 14-12-83)

1. A secu rity-casement-window-stay comprising a conventional stay with a short, longitudinal slot at the pivot end which, in the manner of a door chain, prevents unauthorised persons outside the building in which the windows are built from opening the windows widerand gaining access.