Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2000-03-27
2001-08-21
Lee, Benjamin C. (Department: 2736)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S693900, C340S686100, C340S545100, C340S548000, C340S545200, C340S545500, C340S566000
Reexamination Certificate
active
06278367
ABSTRACT:
This invention relates to a means for indicating displacements of linearly and/or angularly displaceable objects, and/or for maintaining a predetermined setting of such objects relative to a reference location.
In particular, but not exclusively, the present invention is concerned with indicating the position of slidable members and/or tiltable members relative to a fixed position such as a framework in which the members are mounted for slidable or tiltable movement.
Many premises are provided with sliding type doors and windows. For example, large area sliding doors that are often referred to as patio doors. In the case of windows there are the well known sash types which are opened and closed by vertically sliding one part of the window unit relative to another part of the window unit. Window constructions are also known which are inclinable relative to the window frame whilst others are both bodily openable about a vertical axis and also titable about a horizontal axis.
A further form of window construction involving relatively slidable parts are those which include sections which are relatively displaceable in a horizontal direction.
Other forms of window construction are those which are tilted about a horizontal axis during the opening and closing operations.
As is well known, an important factor in relation to the security afforded by doors or windows is the ease by which a door or window can be opened without legitimate users of a property becoming aware that a window or door of the property is being displaced from its closed or from a previously set part open setting.
Security systems serving to detect when a window or door is subjected to unauthorized opening are known.
These known systems are not generally totally applicable in their application to doors and windows as presently used in many premises and may be presently already installed since they can be regarded as being restricted in their application by being able only to provide indication as to whether or not a door or window is open or closed.
Thus these known systems are not suitable for accommodating the degree/extent of or changes in the amount of opening of such doors and windows.
It is an object of the present invention to provide an improved security device in relation to the security afforded by doors and/or windows.
Broadly, according to a first aspect of the present invention there is provided a device for indicating/preventing displacement or for indicating/limiting the overall displacement of a movable member from a preset position, wherein the device is adapted to be selectively positionally mountable to the member.
Preferably, the device is adapted to enable predetermined variations in allowable displacement of a moveable member prior to preventing displacement of the member or for providing an indication of any such displacement of the member.
In accordance with a further aspect of the invention there is provide a device adapted for releasable attachment to the displaceable member, at such position as to be able to contact a non-movable region relative to which the movable member is displaceable following a predetermined amount of displacement, the device including means for producing an indication that such allowed amount of displacement has been effected.
In accordance with a further aspect of the invention there is provided a method of indicating/preventing displacement or for indicating/limiting the overall displacement of a movable member from a preset position including the step of positionally mounting to the member a device adapted to be selectively positionally mountable to the member, the device including means for producing an indication that an allowed amount of displacement has been effected.
In a preferred application of the device the displacement to which the device is responsive is a linear displacement.
In a further preferred application of the device the displacement to which the device responds comprises an angular displacement.
Conveniently, the same device is able to respond to both modes of displacement.
In a preferred arrangement the indication constitutes an audible and or visual warning signal.
REFERENCES:
patent: 3696380 (1972-10-01), Murphy
patent: 4149156 (1979-04-01), Blasucci
patent: 4206452 (1980-06-01), Blasucci
patent: 5489890 (1996-02-01), Moser
patent: 5552768 (1996-09-01), Mikiel et al.
patent: 5734324 (1998-03-01), James
Brinks Hofer Gilson & Lione
Lee Benjamin C.
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