Window sill burglar alarm

• US 4,677,424 A
• Filed: 01/16/1985
• Issued: 06/30/1987
• Est. Priority Date: 01/16/1985
• Status: Expired due to Fees

• Current Assignee: Gus Hollinger
• Original Assignee: Gus Hollinger
• Inventors: Hollinger, Gus
• Primary Examiner(s): Rowland, James L.
• Assistant Examiner(s): Capati, Anne Marie F.
• Application Number:
  US06/691,868
• Time in Patent Office: 895 Days
• Field of Search: 340/547, 340/545, 340/549, 200/61.81
• US Class Current: 340/547
• CPC Class Codes: G08B 13/04 by breaking of glass
• CPC Class Codes: G08B 13/08 by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind

Abstract

A concealable burglar alarm system for automatically generating a warning in response to either unauthorizd opening of a window or breakage of the associated window pane. The system includes a translucent, generally rectangular sending unit which is adapted to be permanently secured upon a window sill adjacent to a window being monitored. The sending unit includes a generally planar mounting base, and an associated magnetic reed switch having a stationary portion and a pivotally deflectable portion. Relative displacement between the reed switch moveable portion and the stationary portion causes an electrical circuit to close, activating a remotely disposed electronic circuit. The base of the sending unit preferably includes an integral, outwardly extending cylindrical projection upon which the coiled portion of a reed switch activation spring is mounted and flangeably secured. The spring includes a pair of outwardly extending first and second ends which are biased apart. The first end is preferably permanently coupled to a portion of the sending unit base, while the second spring end includes a tab portion adapted to be user-coupled to the moveable reed switch member enabling the sending unit and thus the alarm to be mechanically activated or deactivated by the user. A translucent linkage member adapted to be glued to the window pane extends downwardly into contact with the moveable portion of the reed switch to normally bias the sending unit to an "open circuit" condition. However, if the window pane is destroyed, or if the window is opened, the spring will in effect "close circuit" the reed switch and a suitable alarm, preferably disposed remotely from the window, will be activated in response thereto.

Claims

1. A concealable burglar alarm system adapted to be associated with a conventional window for detecting intrusions through or damage to the associated window pane, said system comprising:

a translucent sending unit adapted to be permanently, mounted upon and concealed with respect to the window sill or the like adjacent the glass window pane of said window, said sending unit comprising;

a base adapted to be mounted upon said sill;

a magnetic reed switch having a stationary portion and a moveable portion, the stationary portion adapted to establish a closed electrical path when said moveable portion is displaced from its normal rest position;

spring means adapted to normally torsionally bias said moveable portion from said rest position to an operationally displaced position whereby to activate said reed switch, said spring means including a coiled portion adapted to be coaxially mounted to a generally cylindrical projection integrally emanating from said sending unit base;

a first end adapted to be permanently coupled to a portion of said base; and

a second end biased upwardly with respect to said first end and biased toward said moveable portion of said reed switch by said coiled spring means portion;

said generally cylindrical projection associated with said sending unit base including terminal flange means for axially capturing said coiled portion of said spring means;

concealable translucent linkage means adapted to be user secured to at least a portion of said window pane for contacting and urging said moveable portion of said reed switch towards its rest position against predetermined pressure from said spring means to maintain said system in a "set" state when said window is substantially closed and/or the window pane is unbroken;

said linkage means operable to disengage from said moveable portion of said reed switch when said window is broken or opened whereby said spring means will rotate said reed switch moveable portion;

remote electronic means coupled to said sending unit for generating an alarm signal in response to activation of said reed switch, wherein said remote electronic means includes;

a first electrical power supply adapted to power the electronic means from normal house current;

second internal battery power supply for backing up said first power supply;

means for coupling said electronic means to a plurality of individual remotely disposed sending units; and

,

means for distributing said alarm signal to a plurality of optional remotely disposed transducers; and

,

wherein said second end of said spring means includes a terminal transverse portion adapted to be removably inserted within an orifice defined in said reed switch moveable portion whereby said alarm means may be quickly mechanically deactivated by the user when he wishes the alarm system to be inoperable, without disturbing or adjusting said remote electronic means.