Intrusion detection device

• US 5,461,364 A
• Filed: 04/26/1994
• Issued: 10/24/1995
• Est. Priority Date: 04/26/1994
• Status: Expired due to Fees

• Current Assignee: Jack G. Sanford Jr, Jack G. Sanford Sr
• Original Assignee: Jack G. Sanford Jr, Jack G. Sanford Sr
• Inventors: Sanford, Jack G. Jr., Sanford, Jack G. Sr.
• Primary Examiner(s): SWANN III, GLEN R
• Application Number:
  US08/233,241
• Time in Patent Office: 546 Days
• Field of Search: 340/541, 340/666, 256/11, 256/12
• US Class Current: 340/541
• CPC Class Codes: G08B 13/122 for a perimeter fence features peculiar to electrified fences A01K3/00

Abstract

An intrusion detection device that can be used singly or in multiplicity to immediately and silently alert the user of attempts to climb over a security fencing system. The invention consists of a base element which attaches to the security fencing, and an alarming arm. The alarming arm is equipped with barrier material, such as concertina wire or barbed wire. The alarming arm is connected to the base element both at a pivot point and through a tensioning means. Attempts to climb over the barrier material result in additional loading of the alarming arm which rotates transversely about the pivot point, and against the force of the tensioning means. This rotational displacement of the alarming arm enables an electrical sensing device which then signals that an intrusion is in progress.

Claims

1. An intrusion detection alarming device comprising:

a base element comprising a first end and a second end;

an alarming arm comprising an inner end, an outer end and a pivot point;

said alarming arm being pivotally attached to said base element at said pivot point;

a tension means comprising a base end and an arm end, said base end attached to said base element and said arm end attached to said alarming arm inner end;

a barrier material selected from the group consisting of wire, barbed wire, razor ribbon, razor ribbon concertina, barbed wire concertina, wire mesh and woven wire,

said barrier material attached to and supported by said alarming arm outer end;

an electronic sensor means for detecting relative rotational deflection of said alarming arm with respect to said base element about said pivot point;

said sensing means having a first state and a second state, said first state occurring when said alarming arm is supporting said barrier material and said tension means is restraining the rotational deflection of said alarming arm about said pivot point and said electronic sensor is not detecting rotational deflection of said alarming arm, and said second state occurring when said alarming arm is supporting said barrier material and said tension means is extended due to the addition of force or weight applied to said barrier material or said alarming arm by an intruder and said alarming arm is rotationally deflecting about said pivot point and said electronic sensor is detecting the rotational deflection of said alarming arm;

a sensor state signal transmission means extending from said electronic sensor means; and

a base connection means connecting said base element to a physical structure.

2. The device of claim 1 wherein said base connection means connects said base element first portion to an extension arm.

3. The device of claim 1 wherein said base connection means connects said base element to a post.

4. The device of claim 1 wherein said base connection means connects said base element to a wall.

5. The device of claim 1 wherein said base connection means connects said base element to security fence fabric.

6. The device of claim 1 wherein said electronic sensor means is a sensor selected from the group consisting of electrical switches, electronic switches, micro-switches and optical switches.

7. The device of claim 1 wherein said sensor state signal transmission means extending from said electronic sensor is a transmission means selected from a group consisting of metallic wire, electrical signal cabling and fiber optic wire.

8. In combination:

a barrier structure;

a multiplicity of intrusion detection devices, each of said devices comprising;

a base element comprising a first end and a second end;

an alarming arm comprising an inner end, an outer end and a pivot point;

said alarming arm being pivotally attached to said base element at said pivot point;

a tension means comprising a base end and an arm end, said base end attached to said base element and said arm end attached to said alarming arm inner end;

a barrier material selected from the group consisting of wire, barbed wire, razor ribbon, razor ribbon concertina, barbed wire concertina, wire mesh and woven wire,

said barrier material attached to and supported by said alarming arm outer end;

an electronic sensor means for detecting relative rotational deflection of said alarming arm with respect to said base element about said pivot point;

said sensing means having a first state and a second state, said first state occurring when said alarming arm is supporting said barrier material and said tension means is restraining the rotational deflection of said alarming arm about said pivot point and said electronic sensor is not detecting rotational deflection of said alarming arm, and said second state occurring when said alarming arm is supporting said barrier material and said tension means is extended due to the addition of force or weight applied to said barrier material or said alarming arm by an intruder and said alarming arm is rotationally deflecting about said pivot point and said electronic sensor is detecting the rotational deflection of said alarming arm;

a sensor state signal transmission means extending from said electronic sensor means; and

a base connection means connecting said base element to said barrier structure.

9. The combination of claim 8 wherein said electronic sensor means is a sensor selected from the group consisting of electrical switches, electronic switches, micro-switches and optical switches.

10. The combination of claim 8 wherein said sensor state signal transmission means extending from said electronic sensor is a transmission means selected from a group consisting of metallic wire, electrical signal cabling and fiber optic wire.