Closure fasteners – Braces
Patent
1997-10-07
1999-11-02
Meyers, Steven
Closure fasteners
Braces
292277, E05C 1704
Patent
active
059755989
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a restrictor device for use in restricting the extent of opening of an openable closure and more particularly a window.
Restrictor devices for limiting the extent of opening of a window sash for security and safety purposes are known. Such restrictor devices can, for example, limit the opening of the sash so as to provide for ventilation but prevent unauthorised entry from the outside through the window. Such restrictor devices are also useable to provide safety so as to prevent a window sash opening to such an extent that, say, a small child could pass through the gap between the open sash and the window frame. Additionally a restrictor device can limit the extent of opening so as to prevent, in the event of uncontrolled opening, a person from being drawn through the window opening.
On exceptionally large window sashes restrictor devices can also provide additional control of the sash when friction stays are fitted. Furthermore, when the sash is simply hung on hinges the restrictor device provides the sole means of control of the extent of opening and in many cases maintenance of the sash in the open position.
Restrictor devices whether they be for security or safety purposes or simply to control the sash suffer from a number of drawbacks. For example, they are not versatile in operation in that they usually provide control only at specific degrees of openness of the sash. Furthermore they usually only provide control in one direction. Even further, some restrictor devices can become disengaged upon a force in the opening direction arising, eg due to a wind gust. Such disengagement will permit the sash to slam closed resulting in damage and/or physical danger to someone attending the window or can result in the security/safety purpose of the restrictor being lost.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a restrictor device which overcomes or at least goes some way to overcoming the drawbacks associated with known restrictor devices and in particular provides for control at any angle of opening of the closure within a range of open angles.
Broadly in one aspect of the invention there is provided a restrictor device for limiting the degree of opening of an openable closure, the restrictor device comprising an arm adapted for pivotal mounting to either the closure or the frame in which the closure is mounted, said arm furthermore being coupled to the closure or the frame as the case may be, said coupling being effected by a slideable element pivotally coupled to the arm, there being included restricting means whereby the movement of the slideable element can be selectively restricted.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG 1 is an elevation view of the restrictor device according to one form of the invention, and
FIG. 2 is a cross-sectional view through the slideable element and the track in which the slideable element is engaged.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT OF THE INVENTION
As shown in FIG. 1 the restrictor device comprises an arm 10 which is pivotally coupled at one end via pivot 11 to a mounting plate 12. The mounting plate includes a pair of spaced apart openings 13 through which mechanical fasteners can engage so as to mount the mounting plate 11 to either the frame of a window or the window sash but preferably the frame.
The arm 10 is provided with a cranked end 14 which is engaged via a pivot 15 to a carriage 16. In the preferred form of the invention the arm 10 includes a longitudinally extending reinforcing rib 17.
Carriage 16 is slidingly engaged within a track 18. At each end of the track 18 there is provided an opening 19 through which mechanical fastenings can engage in order to fixedly mount the track 18 to the edge of the window sash. In the event that the mounting plate 11 is attached to the window sash the track is naturally mounted to an edge surface of the window frame.
In the illustrated form of the invention the track includes side walls 20 which are configured and cooperate
REFERENCES:
patent: 984594 (1911-02-01), O'Rourke
patent: 1211733 (1917-01-01), McQueen
patent: 1822719 (1931-09-01), Wellman
patent: 2037261 (1936-04-01), Nenninger
patent: 3696744 (1972-10-01), Etchell
patent: 3917331 (1975-11-01), Duran
patent: 5653486 (1997-08-01), Stillwagon
patent: 5727286 (1998-03-01), Shen
Estremsky Gary
Interlock Group Limited
Meyers Steven
LandOfFree
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