GB2217382A

GB2217382A - A window opening restraint

Info

Publication number: GB2217382A
Application number: GB8808374A
Authority: GB
Inventors: John Haggan
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-04-09
Filing date: 1988-04-09
Publication date: 1989-10-25
Also published as: GB8808374D0

Abstract

A window opening restraint for use on a window in which the opening is adjustable by way of a stay (10) pivotally attached (at 15) to an opening part (11) of the window and movable to one or more positions on a stay pin (13) fixed to the window frame (14) comprises a rigid short tubular sleeve (20) through which the stay passes and fixed rotatably on the stay pin (13), there being an adjustable stop (23) to prevent unauthorised removal of the free end of the stay from the sleeve, and the sleeve is prevented from unauthorised removal from the stay pin by means of a washer and locknut, or alternatively, a lock washer (not shown). <IMAGE>

Description

A WINDOW OPENING RESTRAINT THIS INVENTION relates to a window restraint which is intended to serve as a deterrent against unauthorised entry to premises through an open window.

Many security devices are available for locking and securing opening windows, some of which permit the window to be locked in an open position. However most such devices require the use of a key which renders the device inconvenient and sometimes difficult to open and close.

An object of the present invention is to provide a window restraint which is designed to incorporate and utilise an existing window stay and is adapted to restrict access through the open window.

According to the present invention there is provided a window opening restraint for use on a window in which the opening is adjustable by way of a stay pivotally attached to an opening part of the window and movable to one or more positions on a stay pin fixed to the window frame, the restraint comprising a sleeve through which the stay passes, fixed rotatably on the stay pin, means preventing unauthorised removal of the free end of the stay from the sleeve, and means preventing unauthorised removal of the sleeve from the stay pin.

An embodiment of the invention will now be described by way of example only with reference to the accompanying drawings, in which Fig. 1 is a part-sectional illustration of a window opening restraint made in accordance with the invention in-situ on a so-called transom window; Fig. 2 is a partial elevation taken in the direction of arrow A in Fig. 1; Fig. 3 is a view similar to Fig. 2 but showing the window closed; and Fig. 4 is an elevation of a device made in accordance with the invention, in an assembled form but prior to attachment to a window.

Referring now to the drawings, there is illustrated in Fig. 1 a top-hinged transom opening window of the type which is both opened and fixed closed using a stay 10 pivotally attached to the window 11 and having along its length a number of spaced apertures 12 such that the stay may be placed in a selected position on a stay pin 13 fixed to the window frame 14, the selection of aperture 12 determining the size of opening assumed by the window.

The attachment 15 of stay 10 to window 11 is pivotable both about horizontal and vertical axes so that the stay may be used to lock the window in a closed position against a locking pin 16 as illustrated in Fig. 3.

In accordance with the invention the conventional stay pin which is generally of the type illustrated at 13 but having a plain circumferential surface, is replaced by a threaded pin as best illustrated at 17 in Fig. 4 fixed with respect to a base 18 which can be screwed at 19 in the framework 14. Mounted rotatably about the vertical axis of pin 13, is a rectangular sectioned sleeve 20 formed from a short section of tube and having an aperture in its lower side. A washer 21 and lock nut 22 is applied to permit the sleeve 20 to rotate about pin 13.

As can be seen from Figs. 1 and 3, an adjustable stop 23 in the form of a machine screw and nut, is provided in one of the holes 12 close to the free end of stay 10.

In use, whilst the stay may pass freely through sleeve 20 to be located selectively with one of its holes 12 located over pin 13, the stay is prevented from removal completely from the sleeve, by means of the stop 23. In some cases, the cranked end 24 of the stay is sufficient to prevent removal thereof from the sleeve 20 once the device is assembled and attached to the frame.

Indeed, for assembly it is preferable to place the device partially assembled with lock nut 22 loosely located on threaded pin 13, directly onto the stay prior to attachment at 19 to the frame 14. Once fixed the device cannot be separated from the stay 10 without first being removed from the frame 14.

The sleeve 20 will rotate through at least 900 upon closure of the window to the position illustrated in Fig. 3 so that the stay may engage locking pin 16, and during opening the sleeve rotates to the position illustrated in Figs 1 and 2.

Preferably the device is made from a metallic alloy or from a rigid plastics material, or a combination of both. In the case of decorative window furniture where the stay itself may be of brass, then the entire device can be similarly made of brass or of a material having a similar appearance.

It is not intended to limit the invention to the above example only, many variations being possible without departing from the scope of the appended claims. For example, in place of the washer 21 and lock nut 22 the sleeve 20 may be held in position by means of a lock washer engaging a groove machined in an otherwise smooth surface of pin 13. Similarly, the stop 23 may be fixed to stay 10 in like manner.

Furthermore, to simplify construction of the device, the sleeve 20 may be formed as a sleeve cut from a tube of circular cross-section.

Claims

1. A window opening restraint for use on a window in which the opening is adjustable by way of a stay pivotally attached to an opening part of the window and movable to one or more positions on a stay pin fixed to the window frame, the restraint comprising a sleeve through which the stay passes, fixed rotatably on the stay pin; means preventing unauthorised removal of the free end of the stay from the sleeve; and means preventing unauthorised removal of the sleeve from the stay pin.

2. A window opening restraint according to Claim 1, in which the sleeve is formed from a short section of a tube of a rigid material such as metal or plastics and is of rectangular cross-section with an aperture in its lower side for receiving the stay pin.

3. A window opening restraint according to Claim 1 or Claim 2, wherein said means preventing unauthorised removal of the free end of the stay from the sleeve includes a stop member located close the free end of the stay.

4. A window opening restraint according to Claim 3, wherein said stop member is adjustable in position along said stay thus to determine the maximum opening of the window.

5. A window opening restraint according to Claim 1, wherein the sleeve is prevented from unauthorised removal from the stay pin by means of a washer and locknut, the stay pin having an outer threaded surface to receive same.

6. A window opening restraint according the Claim 1 or Claim 2, wherein the means preventing unauthorised removal of the free end of the stay from the sleeve pin comprises a lock washer engaged in a groove machined in an otherwise smooth surface of the stay pin.

7. A window opening restraint according to any preceding claim, wherein the sleeve is freely rotatable on the stay pin.

8. A window opening restraint according to any preceding claim, wherein the stay is formed as a length cut from a tube of circular cross-section.

9. A window opening restraint substantially as hereinbefore described with reference to and as illustrated in the accompany drawings.