GB2064639A

GB2064639A - Improvements in Window Fasteners

Info

Publication number: GB2064639A
Application number: GB8038490A
Authority: GB
Original assignee: Securistyle Ltd
Current assignee: Securistyle Ltd
Priority date: 1979-11-30
Filing date: 1980-12-01
Publication date: 1981-06-17
Also published as: GB2064639B

Abstract

A window fastener comprises a base plate 10, a handle 12 pivotally mounted on the base plate and provided with a lug 14 which is pivotable with the handle part between a fastened position where the lug may engage a fixed retainer or recess and an unfastened position where the lug is free of engagement with said retainer or recess. A hole 19 extends through the handle adjacent the pivot pin 13, and a portion of the hole nearer the base plate 10 is screw threaded and receives a grub screw 18. The base plate is formed with a recess 19 with which the hole in the handle comes into register when the handle and lug are in the fastened position, whereby the grub screw 18 may be screwed partly out of the threaded portion of the hole and into engagement with the recess, thereby preventing movement of the handle and lug from the fastened position. <IMAGE>

Description

SPECIFICATION Improvements in Window Fasteners The invention relates to window fasteners of the kind comprising a base part, usually for attachment to the widow sash, a handle part pivotally mounted on the base part and provided with a lug which is pivotable with the handle part between a fastened position where the lug may engage a fixed retainer or recess, usually on a fixed frame member of the window, and an unfastened positioned where the lug is free of engagement with said retainer or recess.

While such window fasteners are efficient and convenient for operation by occupants of the building in which the window is installed, they suffer from the disadvantage that they may also permit the window to be opened fairly readiiy from the exterior of the building, by an intruder.

For example, in the case of an aluminium framed window it is often possible for an intruder to drill a hole through the window frame and, by inserting an implement, push the handle of the fastener to the unfastened position. The window may thus be opened from outside without the necessity of breaking the glass. The present invention therefore sets out to provide a window fastener having conveniently operable means whereby it may be locked in the fastened position.

According to the invention, there is provided a window fastener of the kind first referred to above wherein there is provided a hole extending through said handle part, a portion of the hole nearer the base part being screw threaded and receiving a screw member, and the base part being formed with a recess with which said hole in the handle part comes into register when the handle part and lug are in the fastened position, whereby the screw member may be screwed partly out of the threaded portion of the hole and into engagement with the recess, thereby preventing movement of the handle and lug from the fastened position.Thus when the fastener is locked, the window may only be opened by first unscrewing the screw member to permit the relative pivotal movement between the parts of the fastener, and the arrangement may be such that it is virtually impossible to do this from outside the window without first breaking the glass.

Preferably the partly threaded hole in the handle is of constant diameter, and opens into a larger diameter counterbore in the handle.

The base part is also preferably formed with an abutment which is engaged by the lug when the handle part and lug are in the fastened position.

A preferred embodiment of the invention is shown, by way of example, in the accompanying drawing, which is a vertical section through a fastener for a casement window.

The fastener comprises a baseplate 10 having countersunk holes 11 for screwing it to a window sash. A cranked handle 12 is pivotally connected to the baseplate 10 by means of a pivot pin 13. A separately formed lug 14 is received in a rebate in the cranked handle 12 adjacent the pivot pin and projects laterally of the base plate when the handle is in a fastened position, lying longitudinally of the baseplate, as shown in the drawing. Headed nylon bushes 1 5 encircle the pivot pin 1 3 where it passes through the handle 12 and lug 14, and a nylon washer 16 is disposed between the bush in the lug 14 and the baseplate 10 to provide a gap between the handle 12 and the baseplate 10.

When the handle 12 and lug 14 are in the position shown in the drawing, the laterally projecting portion of the lug engages in a fixed retainer or recess (not shown) in the window frame. Pivoting of the handle 12 through 900 brings the lug out of engagement with the retainer or recess so that the window may be opened. The baseplate is integrally formed with an abutment 1 7 which limits the pivotal movement of the handle 12 relative thereto.

Differently shaped lugs 14 are required according to whether the fastener is a lefthanded or a righthanded fastener, but the other components are common to both types of fastener.

A grub screw is wholly received in a threaded hole 1 9 in the handle 12, the hole 1 9 extending parallel to the axis of the pivot pin 1 3 to one side thereof and when the handle 12 and lug 14 are in the fastened position shown, the grub screw 1 8 may be screwed so as to project from the handle and into a circular recess 19 formed in the baseplate. In this position it prevents movement of the handle to the unfastened position.

The grub screw 1 8 is formed with a hexagonal recess 20 in its head so that it may be rotated by means of an Allen key. The hole containing the grub screw has an outer portion 21 left unthreaded to prevent the screw member being completely unscrewed and withdrawn from the handle. The unthreaded portion 21 of the hole leads into a partial larger diameter counterbore 22 in the handle 1 2 to faciliate access to the grub screw 18 and to enable it to be more easily seen.

It will be appreciated that other forms of head may be provided on the grub screw, for example a conventional slot for engagement by a screwdriver.

The baseplate 10, handle 12 and lug 14 may conveniently be formed from portions cut from suitably sectioned aluminium extrusions.

As previously mentioned, the provision of the locking screw member makes it difficult for an intruder to release the fastener from outside the window and the locking arrangement also acts as a safety device to prevent children from unfastening the window, this being particularly advantageous in high-rise buildings.

Claims

1. A window fastener comprising a base part, a handle part pivotally mounted on the base part and provided with a lug which is pivotable with the handle part between a fastened position where the lug may engage a fixed retainer or recess and an unfastened position where the lug

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in Window Fasteners The invention relates to window fasteners of the kind comprising a base part, usually for attachment to the widow sash, a handle part pivotally mounted on the base part and provided with a lug which is pivotable with the handle part between a fastened position where the lug may engage a fixed retainer or recess, usually on a fixed frame member of the window, and an unfastened positioned where the lug is free of engagement with said retainer or recess. While such window fasteners are efficient and convenient for operation by occupants of the building in which the window is installed, they suffer from the disadvantage that they may also permit the window to be opened fairly readiiy from the exterior of the building, by an intruder. For example, in the case of an aluminium framed window it is often possible for an intruder to drill a hole through the window frame and, by inserting an implement, push the handle of the fastener to the unfastened position. The window may thus be opened from outside without the necessity of breaking the glass. The present invention therefore sets out to provide a window fastener having conveniently operable means whereby it may be locked in the fastened position. According to the invention, there is provided a window fastener of the kind first referred to above wherein there is provided a hole extending through said handle part, a portion of the hole nearer the base part being screw threaded and receiving a screw member, and the base part being formed with a recess with which said hole in the handle part comes into register when the handle part and lug are in the fastened position, whereby the screw member may be screwed partly out of the threaded portion of the hole and into engagement with the recess, thereby preventing movement of the handle and lug from the fastened position.Thus when the fastener is locked, the window may only be opened by first unscrewing the screw member to permit the relative pivotal movement between the parts of the fastener, and the arrangement may be such that it is virtually impossible to do this from outside the window without first breaking the glass. Preferably the partly threaded hole in the handle is of constant diameter, and opens into a larger diameter counterbore in the handle. The base part is also preferably formed with an abutment which is engaged by the lug when the handle part and lug are in the fastened position. A preferred embodiment of the invention is shown, by way of example, in the accompanying drawing, which is a vertical section through a fastener for a casement window. The fastener comprises a baseplate 10 having countersunk holes 11 for screwing it to a window sash. A cranked handle 12 is pivotally connected to the baseplate 10 by means of a pivot pin 13. A separately formed lug 14 is received in a rebate in the cranked handle 12 adjacent the pivot pin and projects laterally of the base plate when the handle is in a fastened position, lying longitudinally of the baseplate, as shown in the drawing. Headed nylon bushes 1 5 encircle the pivot pin 1 3 where it passes through the handle 12 and lug 14, and a nylon washer 16 is disposed between the bush in the lug 14 and the baseplate 10 to provide a gap between the handle 12 and the baseplate 10. When the handle 12 and lug 14 are in the position shown in the drawing, the laterally projecting portion of the lug engages in a fixed retainer or recess (not shown) in the window frame. Pivoting of the handle 12 through 900 brings the lug out of engagement with the retainer or recess so that the window may be opened. The baseplate is integrally formed with an abutment 1 7 which limits the pivotal movement of the handle 12 relative thereto. Differently shaped lugs 14 are required according to whether the fastener is a lefthanded or a righthanded fastener, but the other components are common to both types of fastener. A grub screw is wholly received in a threaded hole 1 9 in the handle 12, the hole 1 9 extending parallel to the axis of the pivot pin 1 3 to one side thereof and when the handle 12 and lug 14 are in the fastened position shown, the grub screw 1 8 may be screwed so as to project from the handle and into a circular recess 19 formed in the baseplate. In this position it prevents movement of the handle to the unfastened position. The grub screw 1 8 is formed with a hexagonal recess 20 in its head so that it may be rotated by means of an Allen key. The hole containing the grub screw has an outer portion 21 left unthreaded to prevent the screw member being completely unscrewed and withdrawn from the handle. The unthreaded portion 21 of the hole leads into a partial larger diameter counterbore 22 in the handle 1 2 to faciliate access to the grub screw 18 and to enable it to be more easily seen. It will be appreciated that other forms of head may be provided on the grub screw, for example a conventional slot for engagement by a screwdriver. The baseplate 10, handle 12 and lug 14 may conveniently be formed from portions cut from suitably sectioned aluminium extrusions. As previously mentioned, the provision of the locking screw member makes it difficult for an intruder to release the fastener from outside the window and the locking arrangement also acts as a safety device to prevent children from unfastening the window, this being particularly advantageous in high-rise buildings. Claims

1. A window fastener comprising a base part, a handle part pivotally mounted on the base part and provided with a lug which is pivotable with the handle part between a fastened position where the lug may engage a fixed retainer or recess and an unfastened position where the lug is free of engagement with said retainer or recess, a hole extending through said handle part, a portion of the hole nearer the base part being screw threaded and receiving a screw member, and the base part being formed with a recess with which said hole in the handle part comes into register when the handle part and lug are in the fastened position, whereby the screw member may be screwed partly out of the threaded portion of the hole and into engagement with the recess, thereby preventing movement of the handle and lug from the fastened position.

2. A window fastener according to claim 1, wherein the partly threaded hole in the handle is of constant diameter.

3. A window fastener according to claim 1 or claim 2, wherein the unthreaded portion of the hole opens into a larger diameter counterbore in the handle.

4. A window fastener according to any of claims 1 to 3, wherein the base part is formed with an abutment which is engaged by the lug when the handle part and lug are in the fastened position.

5. A window fastener substantially as hereinbefore described with reference to the accompanying drawing.