Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-11-06
1998-03-31
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
340693, G08B 1308
Patent
active
057343241
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to alarm devices, and more particularly to alarm devices that are activated upon the opening of a sliding door or other moveable sliding frame.
BACKGROUND ART
One of the consequences of our increasingly crowded urban society has been the inexorably increasing crime rate, the mere threat of which has driven many people to be security conscious. Breaking and entering and burglary, and even physical violence or the threat thereof by intruders, have become increasingly common occurrences, particularly in the case of residential property. Accordingly, the sale and installation of various security systems such as burglar alarms has become a thriving business as many property owners seek to discourage crime to both person and property through the use of such systems.
Professionally installed security systems tend to be quite sophisticated in design and expensive to install. More common are perhaps owner-installed or portable systems of various types which are often installed only on a single door or window. Such systems are popular because they are more economical than the professionally-installed system, and because they can be installed by the home-owner and can usually be removed and taken when the owner of the device moves to another home.
Perhaps the most common window designs are sliding windows, either opening by sliding the moveable window horizontally or vertically to open or close them. Some apartments or home units and homes also have exterior patios with sliding doors, which slide horizontally to open or close. A number of the relatively inexpensive owner-installable security devices, unfortunately do not work with such slidable doors and windows.
The most common door security devices are designed for use with conventionally hinged doors. Movement of the door is designed to trip an alarm and to provide an audible alarm. For example, the device is placed in front of an inwardly opening hinged door, such that when the door is opened, the device will be jarred or tripped over, causing an alarm to be sounded. Examples are disclosed in U.S. Pat. No. 4,540,980 to Porco and U.S. Pat. No. 4,266,216 to Trusty. Other similar devices are designed to be hung from the doorknob, and will react to the door being opened through the use of motion detectors. See for example U.S. Pat. No. 4,100,539 to Stahl, et al. One embodiment of the Stahl, et all device includes a modification for converting the door knob alarm to a sliding window or sliding door alarm by providing a false door knob on a spindle with a small suction cap on the opposite end of the spindle. The suction cap is attached to the fixed glass of the door or window and the alarm device is friction fitted to the false door knob. When the sliding door or window comes into contact with the alarm device, the jarring action causes the alarm to be tripped and sounded.
The most popular type of device which is useable on sliding doors and windows is the bar-type device, which is illustrated in U.S. Pat. No. 4,193,067 to Hawkins, U.S. Pat. No. 4,495,486 to White, U.S. Pat. No. 4,553,134 to Holt and U.S. Pat. No. 4,888,578 to Conemac. The Hawkins device has a rod which operates a mechanical switch, with a detent retaining the rod in a position to continuously operate the switch once initially operated. The White alarm acts as a physical obstruction preventing opening of a sliding door or window until it is removed, at which time the alarm will be sounded.
The Holt device is a spring-loaded bar which may also be installed in a window casing. However, one of the main disadvantages is that the device is not widely adapted to different size window and door frames. The Conemac device is also an elongate bar or rod device which is adjustable in width, but is still required to be manufactured in several different sizes to fit a variety of sizes or door and window openings.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an alarm device which goes at least some way towards overcoming or at le
REFERENCES:
patent: 3840870 (1974-10-01), Norrod
patent: 4100539 (1978-07-01), Stahl et al.
patent: 4123752 (1978-10-01), Novotny
patent: 4149156 (1979-04-01), Blasucci
patent: 4193067 (1980-03-01), Hawkins
patent: 4266216 (1981-05-01), Trusty
patent: 4339747 (1982-07-01), Maybee
patent: 4348662 (1982-09-01), Fontaine et al.
patent: 4495486 (1985-01-01), White
patent: 4540980 (1985-09-01), Porco
patent: 4553134 (1985-11-01), Holt
patent: 4837557 (1989-06-01), Striebel
patent: 4888578 (1989-12-01), Conemac
patent: 4896139 (1990-01-01), Eldridge
patent: 5022340 (1991-06-01), Caraba
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