WIRELESS ALARM SYSTEM

• US 3,641,540 A
• Filed: 03/30/1970
• Issued: 02/08/1972
• Est. Priority Date: 03/30/1970
• Status: Expired due to Term

• Current Assignee: Joel I. Glickman, Joel L. Cutler
• Original Assignee: Joel I. Glickman, Joel L. Cutler
• Inventors: Cutler, Joel L., Glickman, Joel I.
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Bobbitt, J. Michael
• Application Number:
  US05/023,577
• Time in Patent Office: 680 Days
• Field of Search: 340/224,274,276 325/169,185 335/128,172-174
• US Class Current: 340/539.14
• CPC Class Codes: G08B 13/08 by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind

Abstract

A double-hung window mounted alarm actuating unit comprises a transmitter for generating wireless signals, a relative constant voltage power source connected to the transmitter, and switch means mounted to the bottom and top windows operable upon the opening of either the bottom or top window for actuating the transmitter to generate a wireless signal for a relatively short period, whereby the transmitter draws power from the power source only during the relatively short period. Switch means closing for relatively short period via magnetic decoupling of spring biased armature.

Claims

1. An alarm system for detecting the movement of the top window or the bottom window of a double-hung window which in its closed position closes an opening comprising:

a transmitter for generating a wireless signal;

a relatively constant voltage power source;

switch means;

said switch means being disposed so as to detect movement of the top window or the bottom window;

said switch means being actuated upon the movement of the top window or the bottom window a predetermined amount;

said switch means being automatically deactuated during normal opening of the top or bottom window after a relatively short period of time after actuation;

means electrically interconnecting said transmitter, said relatively constant voltage power source and said switch means so that actuation of said switch means during normal opening of the top or bottom window causes said transmitter to draw power from said relatively constant voltage power source for said relatively short period of time and to thereby transmit a wireless signal for said relatively short period of time;

said transmitter, said relatively constant voltage power source and said sWitch means being electrically interconnected so that upon the expiration of said relatively short period of time said switch means prevents said transmitter from drawing power from said relatively constant voltage power source and further prevents said transmitter from generating a wireless signal;

means for receiving said wireless signal;

alarm means;

means connecting said receiving means to said alarm means so that reception of said wireless signal by said receiving means causes actuation of said alarm means for a period of time longer than said relatively short period of time;

means for disconnecting said alarm means so that generation of said wireless signal does not function to actuate said alarm means;

said switch means comprising a first switch unit mounted to either the bottom or the top window;

a second switch unit mounted to the other of the bottom or the top window;

said first switch unit being comprised of such a material as to be displaced by a magnetic field;

said second switch unit comprising magnetic field generating means whereby displacement of the top window or displacement of the bottom window said predetermined amount causes actuation of said transmitter.

2. An alarm system in accordance with claim 1 wherein said first switch unit is mounted to either the upper portion of the bottom window or the lower portion of the top window and said second switch unit is mounted to the other of the upper portion of the bottom window or the lower portion of the top window.

3. An alarm system in accordance with claim 2 wherein said first and said second switch units are mounted to the inside portions of the top and bottom windows.

4. An alarm system in accordance with claim 3 wherein said first switch unit comprises a first contact member and a second contact member, said first contact member being comprised of a magnetic material so as to be displaced in a first direction by said magnetic field generating means of said second switch unit when the top and bottom windows are in their closed positions, means biasing said first contact member in a second direction so that when either the top or bottom window is displaced from its closed position, said first contact member is displaced in said second direction so as to make an electrical connection with said second contact member causing actuation of said switch means.

5. An alarm system in accordance with claim 4 wherein said biasing means comprises a spring and wherein said first contact member is displaceable about a pivot under the force of said biasing means.

6. An alarm system in accordance with claim 5 wherein when the top or bottom window is displaced said predetermined amount said biasing means causes said first contact member to be displaced in said second direction causing said first contact member to be successively out of contact with said second contact member, in contact with said second contact member, and out of contact with said second contact member after being in contact with said second contact member for said relatively short period of time.