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United States Patent [i9]
[ii] 4,149,156  Apr. 10, 1979
 WINDOW ALARM EMPLOYING A RELEASABLY MOUNTED PLUNGER SWITCH
 Inventor: Leonard Blasucci, 98 Roosevelt Ave., Jersey City, N.J. 07304
 Appl. No.: 805,508
 Filed: Jun. 10,1977
 Int. CM G08B 13/08
 U.S. CI 340/545; 200/61.93;
 Field of Search 340/274 R, 545, 546;
200/61.73, 61.72, 61.71, 61.93
 References Cited
U.S. PATENT DOCUMENTS
3,175,207 3/1965 Hewitt, Jr 390/274 R
3,409,886 11/1968 Davis et al 340/274 R
3,594,763 7/1971 Peek 340/274 R
3,641,540 2/1972 Cutler et al 340/274 R
3,797,005 3/1974 Schwarz 340/274 R
4,023,156 5/1977 Galvin 340/274 R
Primary Examiner—Glen R. Swann, III
Attorney, Agent, or Firm—Blum, Moscovitz, Friedman
A plunger switch is releasably held against the inner surface of the outer section of a double-hung window or sliding door; by a suction cup, in an exemplary embodiment. Movement of the inner section with respect to the outer section dislodges the suction cup, releasing the switch and allowing it to close. Closure of the switch actuates a signalling means to generate an alarm signal.
16 Claims, 8 Drawing Figures
U.S. Patent Apr. 10,1979 sheet 2 of 2 4,149,156
WINDOW ALARM EMPLOYING A RELEASABLY MOUNTED PLUNGER SWITCH
BACKGROUND OF THE INVENTION 5
With the surge in the crime rate in general and, particularly in the burglary rate, there has been a proliferation of protective devices, directed mostly toward prevention of illegal entry through doors. Bars and gratings of various types have been placed across windows 10 but, in addition to being unsightly, these constitute a serious danger in that they may prevent rapid escape in the event of fire. Moreover, the cost of such devices, when added to installation costs, makes complete protection of all windows in an apartment or home almost 15 prohibitively expensive. Somewhat the same problem arises with respect to sliding doors whether of the type where a single door slides into a wall or the double type where either of a pair of sliding doors can be moved past the other.
While complete prevention of illegal entry by intruders provides the ultimate in protection, nevertheless, an effective alarm system, which is sufficiently inexpensive so that it can be widely applied, can provide a measure of protection which substantially increases the security of the inhabitants. As is evident, then, an inexpensive but effective device, which is reliable and readily installed, is desired.
In a double-hung window, each window sash slides in its own track, usually vertical, and one window-sash, with its corresponding pane of glass is external to the other. The construction is usually such that when the j5 window is completely closed, the lower edge of the upper window-sash, which is usually the outer window, is flush with the upper edge of the lower window-sash. According to the present invention, a sensor, which includes readily-releaseable attachment means, is at- 40 tached to the inner surface of the upper window proximate the lower portion of the corresponding windowsash. The sensor projects away from the inner surface of the window so that movement of either of the windowsashes to an extent greater than a pre-selected amount, 45 where the pre-selected amount may be zero, dislodges the sensor from its point of attachment. The sensor is so constructed that such a dislodgement causes the generation of an alarm signal by a buzzer, the lighting of an indicator light or a radio tranmission to a centrally- so located receiver.
A preferred means of initiating the alarm is a plunger switch that is deactivated by pressing the plunger against the window in the act of attachment. A preferred means of attachment is by means of a suction cup 55 constituting part of the housing holding the plunger. The alarm generation means can be powered by internal cells, by an external power pack or by connection to house current.
Accordingly, it is an object of the instant invention to 60 provide an improved window alarm device.
A further object of the instant invention is to provide an improved alarm device that is particularly suited for use with double hung windows or sliding doors having at least two sections. 65
Still a further object of the instant invention is to provide an inexpensive, portable and reliable window and sliding door alarm device.
Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification.
The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the invention will be indicated in the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
For a fuller understanding of the invention, reference is had to the following description taken in connection with the accompanying drawings, in which:
FIG. 1 is a section through a double-hung window showing devices in accordance with the present invention in operating position and means for powering same;
FIG. lA is an alternate embodiment of the device depicted in FIG. 1;
FIG. 2 is a sectional view of a device in accordance with the present invention including a sensor, a power pack and an alarm buzzer;
FIG. 3 is a sectional view of an embodiment of the instant invention sgowing the internal circuitry thereof;
FIGS. 4 and 5 are further embodiments of the invention; and
FIGS. 6 and 7 show schematically how the device of subject invention can be used with sliding doors.
DETAILED DESCRIPTION OF THE
Reference is now made to FIG. 1 wherein a schematic, illustrating how devices of the present invention can be used to produce an alarm signal when a window, fitted for such a device or devices, is opened by an intruder, is provided. The sensor indicated generally by the reference numeral 11 is attached to inner surface 12 of window pane 13 in the upper section of the doublehung window, said upper section being indicated generally by the reference numeral 14.
Window-pane 13 is in window-sash 16. Sensor 11 is preferably placed proximate lower edge 17 of upper window-sash 16. Optionally, sensor 11 may be shaped so that when placed in the position specified, any motion of lower sash 18, in an upward direction, or of upper sash 16, in a downward direction, will dislodge sensor 11 which is releaseably attached to window-pane 13. Optionally, of course, sensor 11 may be placed far enough away from lower edge 17 of window-sash 16 so that the window may be kept partially opened so as to permit ventilation, but yet not so far open as to permit entry of an intruder.
The sensor 11 may be connected through wires 19 to an alarm-signalling pack 21 which may be internallypowered by electrochemical cells. Alternatively, as illustrated in FIG. 1A the sensor may be powered by house wiring which also powers an alarm 22.
In order to prevent entry by breakage of a glass window, a sensor 23 is desirably placed on the interior surface of window-pane 24 in the lower window-sash 18. Breakage of either the lower window 24 or the upper window 13 will dislodge the corresponding sensor and activate an appropriately-disposed alarm means.
As is illustrated in FIGS. 2 and 3, a preferred means of attaching a sensor to a window-pane is by use of a suction cup 25 which may be of rubber and may constitute an integral part of the sensor. A plunger switch 26 includes a button 27 at the end thereof which is pushed inwardly when the sensor is pushed against a surface to