Restricting device
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United States of America Patent
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Oct 9, 2007
Grant Date -
Dec 1, 2005
app pub date -
Jun 27, 2003
filing date -
Aug 1, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention provides a restricting device for a closure including a vent hingedly connected to a frame, the restricting device comprising a plate (1,4) for mounting on a frame, an arm (7) for pivotally mounting on a vent and means for releasably interengaging the arm and the plate, wherein, in use, when the plate and the arm are interengaged, the closure can only be opened a predetermined distance. The means for releasably interengaging the arm and the plate comprise a resilient means (2) adapted to engage a locking pin (5). The engagement between the arm and the plate is released by means of a release means, for example a key (6,6';6''), which is separate from the rest of the device. A preferred embodiment of the invention provides means (16,17; 18, 20) for preventing over-rotation of the key beyond a position in which the resilient means is in an optimum release position. The device is simple to use and has the advantage that it is detachable.
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