US4527150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intrusion detection system
Assignee: Senstar Technologies Ltd
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Filing: 1982-09-30
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Granted: 1985-07-02
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Expires: 2002-09-30
Abstract
Abstract An underground taut wire intrusion detection system includes a sensor wire enclosed within a conduit adapted to be buried in the ground, the conduit being sufficiently rigid so as to be collapse-resistant when buried in the ground, but being sufficiently flexible in its length such that when disturbed by an attempted intruder the disturbance is transferred to the sensor wire to cause it to actuate a detector.
Inventors
- 👤 Chaim Porat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:25
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/12; G08B13/122; G08B13/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
166 words
An underground intrusion detection system including a taut sensor wire buried in the ground and connected to an intrusion detector for detecting an attempted intrusion by producing an electrical signal when the sensor wire is cut or disturbed, characterized in that said sensor wire is tensioned between a pair of ground stakes buried in the ground and is enclosed within a conduit buried in the ground and having a longitudinal passageway of slightly greater inner diameter than the outer diameter of the sensor wire so that the sensor wire is freely movable therein, said conduit being sufficiently rigid to make said passagway collapse-resistant such that the conduit maintains the free movement of the sensor wire in its passageway when both the conduit and its sensor wire are buried in the ground, said conduit being sufficiently flexible in its length to flex when disturbed by an attempted intruder to apply a force to the sensor wire and thereby to cause the sensor wire to actuate the detector.
Claim 2
Dependent Claim
166 words
An underground intrusion detection system including a taut sensor wire buried in the ground and connected to an intrusion detector for detecting an attempted intrusion by producing an electrical signal when the sensor wire is cut or disturbed, characterized in that said sensor wire is tensioned between a pair of ground stakes buried in the ground and is enclosed within a conduit buried in the ground and having a longitudinal passageway of slightly greater inner diameter than the outer diameter of the sensor wire so that the sensor wire is freely movable therein, said conduit being sufficiently rigid to make said passagway collapse-resistant such that the conduit maintains the free movement of the sensor wire in its passageway when both the conduit and its sensor wire are buried in the ground, said conduit being sufficiently flexible in its length to flex when disturbed by an attempted intruder to apply a force to the sensor wire and thereby to cause the sensor wire to actuate the detector.
Claim 3
Dependent Claim
32 words
The system according to claim 1, wherein at least one end connection of the sensor wire to a ground stake includes variable tensioning means for varying the tautness of the sensor wire.
Claim 4
Dependent Claim
36 words
The system according to claim 2, wherein said detector is enclosed within a rigid housing also buried in the ground, said sensor wire passing through said housing and being connected to said detector within said housing.
Claim 5
Dependent Claim
58 words
The system according to claim 3, wherein each portion of said sensor wire extending from its respective side of the detector housing to the respective ground stake is covered by a separate section of said conduit, each section being connected at one end to a fitting on the detector housing forming a sealed lead-in for the sensor wire.
Claim 6
Dependent Claim
22 words
The system according to claim 4, wherein said detector housing includes one or more ground stakes for anchoring same in the ground.
Claim 7
Dependent Claim
43 words
The system according to claim 1, wherein there are a plurality of said sensor wires buried at different depths in the ground, each sensor wire being enclosed, and freely movable, within its conduit for actuating the detector upon sensing an attempted deep-tunnel intrusion.
Claim 8
Dependent Claim
20 words
The system according to claim 6, wherein each of said plurality of sensor wires is connected to a separate detector.
Claim 9
Dependent Claim
18 words
The system according to claim 6, wherein said plurality of sensor wires are connected to a common detector.
Claim 10
Dependent Claim
54 words
The system according to claim 1, wherein there are a plurality of said sensor wires buried in a predetermined area in the ground at different horizontal spacings from each other, each sensor wire being enclosed, and freely movable, within its conduit for actuating the detector upon sensing a predetermined weight on said predetermined area.
Claim 11
Dependent Claim
42 words
The system according to claim 9, wherein each of said conduits is a separate hollow tube and is supported on an underlying layer of resilient cushioning material to facilitate the displacement thereof under the weight of a person in said predetermined area.
Claim 12
Dependent Claim
31 words
The system according to claim 10, further including a rigid sheet overlying said hollow tubes to transmit thereto the force exerted by the weight of a person in said predetermined area.
Claim 13
Dependent Claim
29 words
The system according to claim 9 wherein said plurality of sensor wires are disposed in a common conduit formed with a plurality of separate passageways for the sensor wires.
Claim 14
Dependent Claim
25 words
The system according to claim 12, wherein said common conduit is of relatively rigid plastics material and includes an underlying layer of resilient cushioning material.
Claim 15
Dependent Claim
48 words
The system according to claim 9, in combination with a security fence above the ground which fence includes a plurality of further taut sensor wires for detecting an attempted intrusion through the fence, while said first-mentioned taut sensor wires detect the presence of a person near the fence.
Claim 16
Dependent Claim
46 words
The system according to claim 1, in combination with a security fence above the ground which fence includes a plurality of further taut sensor wires for detecting an attempted intrusion through the fence, while said fist-mentioned taut sensor wire detects an attempted intrusion under the fence.
Claim 17
Dependent Claim
13 words
The system according to claim 1, wherein said detector is a force detector.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |