Display table security system

• US 4,896,140 A
• Filed: 01/09/1989
• Issued: 01/23/1990
• Est. Priority Date: 01/09/1989
• Status: Expired due to Fees

• Current Assignee: Dale E. Biever, Lee M. Frank Sr
• Original Assignee: Dale E. Biever, Lee M. Frank Sr
• Inventors: Biever, Dale E., Frank, Lee M. Sr.
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US07/294,753
• Time in Patent Office: 379 Days
• Field of Search: 340/568, 340/652, 340/650, 340/651
• US Class Current: 340/568.2
• CPC Class Codes: G08B 13/1454 Circuit arrangements thereof

Abstract

A control module is connected to a table strip having a number of jacks. A sensor probe which consists of a sensor detector and a sensor cable has at the end of the cable a plug which is connected to the table strip jack. Each sensor cable is provided with a continuity circuit and a floating circuit such that cutting of the cable or shorting of the cable will energize an indicator circuit and an alarm annunciator in the control module.

Claims

1. A security system for individual articles on display comprising a sensor detector engaged by an article on display and responsive to a predetermined movement of said article or to a predetermined condition of the sensor detector itself, an indicator sub-system having an alarm annunciator, means for connecting said sensor detector to said indicator sub-system and comprising a continuity circuit and a floating circuit, said indicator sub-system comprising a first indicator circuit connected to said continuity circuit and responsive to interruption of said continuity circuit and a second indicator circuit connected to said floating circuit and responsive to an interruption of said floating circuit, said alarm annunciator being connected to said first and second indicator circuits and actuated by either one or both of said indicator circuits.

2. A security system as claimed in claim 1 wherein said connecting means comprises first and second wires defining said continuity circuit and a third wire defining said floating circuit, said wires being free of twisting or exposure.

3. A security system as claimed in claim 1 wherein said continuity circuit is normally held at a low condition and said floating circuit is normally held at a high condition, said continuity circuit will go high when its continuity is interrupted, said floating circuit will go low when said floating circuit is shorted.

4. A security system as claimed in claim 3 wherein said alarm annunciator is actuated by a high condition in said continuity system.

5. A security system as claimed in claim 4 wherein a low condition of said floating circuit will actuate said alarm annunciator.

6. A security system as claimed in claim 3 and comprising means in said indicator system for resetting said system after said alarm annunciator has been actuated.