# US 4,643,400 A · Trip-wire guiding device and protective fence including same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,643,400 A
- Document ID: US4643400A
- Status: Granted
- Kind: A
- Application number: 06/111,280
- Filed: 1980-01-11
- Granted: 1987-02-17
- Earliest claimed: 1980-01-11
- Assignees: Beta Engineering & Development Ltd.
- Inventors: Chaim Porat
- Web page: https://patentgrep.com/patent/US4643400A

## CPC

- G08B 13/122: {for a perimeter fence (features peculiar to electrified fences A01K3/00)}
- E04H 17/12: the wire being placed in slots, grooves, or the like
- E04H 17/24: Connections for attaching additional wire to frames, posts or railings
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- E04H: BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL (foundations E02D)

## Abstract

A trip-wire guiding device for a protective fence is described including an elongated member attachable to ground-anchoring means intermediate the fence poles and formed with a plurality of openings through which the tensioned trip-wire are passed for maintaining them in parallel space relationship. Each trip-wire is insertable into the opening via a passageway extending from the opening to the edge of the member. A common locking member is received in a channel extending longitudinally through the elongated member aligned with and passing through the passageways, the common locking member being effective to lock the trip-wires in their respective opening against removal through the passageways, but permits their longitudinal movement, such as to cause the detector means to be actuated upon a change in tension in the trip-wires, but to preclude disabling the detector means by merely fastening the tensioned trip-wires to the wire-guiding member or to the common locking member fixed thereto. In several described embodiments the elongated trip-wire guiding member is made of sheet metal, and in a further described embodiment it comprises an open spiral rod.

## Claims

### Claim 1

A trip-wire guiding device for a protective fence including a plurality of trip-wires tensioned between a pair of fence poles and connected to detector means for actuating same upon the disturbance of said trip-wires by an attempted penetration of the fence; said trip-wire guiding device including a ground-anchorable mounting pole having a stake at its lower end insertable into the ground between said pair of fence poles, an elongated trip-wire guiding means, and force-yielding attaching means attaching the elongated guiding means in a spaced, force-yielding manner to and laterally of said mounting pole; said elongated trip-wire guiding means comprising an open-spiral rod having lateral spaces between adjacent spirals which spaces serve as longitudinally-spaced openings through which said trip-wires are to be passed by sidewise insertion for maintaining them in parallel space relationship; the axial space through all the spirals constituting an axial channel extending longitudinally through the open-spiral rod; and a common locking member received in said axial channel of the open-spiral rod for locking the trip-wires against removal through the lateral spaces between adjacent spirals, while permitting free longitudinal movement of the tensioned trip-wires such as to cause the detector means to be actuated upon a change in tension in the trip-wires; said force-yielding attaching means including a plurality of short rods attachable at one end to said ground-anchorable mounting pole and formed with eyes at their opposite ends disposed in the spaces between adjacent spirals of the open-spiral rod, said elongated trip-wire guiding means further including a second straight rod passed through said axial channel through the open-spiral rod and through the eyes of the plurality of short rods.

### Claim 2 (depends on 1)

The device according to claim 1, wherein said two straight rods are secured within the open-spiral rod by securing means including apertured plates attached to the upper end of the straight rods by pins passing through the apertures of said plate and eyes formed at the upper end of said straight rods.

### Claim 3 (depends on 2)

The device according to claim 2, wherein said two straight rods are further secured within said open-spiral rod by additional securing means including additional apertured plates attached to the lower end of the two straight rods by pins passing through the apertures of said plates and eyes formed at the lower end of the straight rods.

### Claim 4 (depends on 2)

The device according to claim 2, wherein said pins in said securing means are rivets.

### Claim 5

A trip-wire guiding device for a protective fence including a plurality of trip-wires tensioned between a pair of fence poles and connected to detector means for actuating same upon the disturbance of said trip-wires by an attempted penetration of the fence; said trip-wire guiding device including a ground-anchorable mounting pole having a stake at its lower end insertable into the ground between said pair of fence poles, an elongated trip-wire guiding means, and force-yielding attaching means attaching the elongated guiding means in a spaced, force-yielding manner to and laterally of said mounting pole; said elongated trip-wire guiding means comprising an open-spiral rod having lateral spaces between adjacent spirals which spaces serve as longitudinally-spaced openings through which said trip-wires are to be passed by sidewise insertion for maintaining them in parallel space relationship; the axial space through all the spirals constituting an axial channel extending longitudinally through the open-spiral rod; said force-yielding attaching means including a plurality of short rods attachable at one end to said ground-anchorable mounting pole and formed with eyes at their opposite ends disposed in the spaces between adjacent spirals of the open-spiral rod; said trip-wire guiding device further including rod means passing through said axial channel of the open-spiral rod for locking the trip-wires against sidewise removal while permitting longitudinal movement thereof, and also passing through the eyes of the plurality of short rods for attaching the open spiral rod to the mounting pole in a force-yielding manner.

### Claim 6 (depends on 5)

The device according to claim 5, wherein said rod means comprises a pair of straight rods passing through said axial channel of the open spiral rod, one of said straight rods passing through the eyes of said plurality of short rods for attaching the open-spiral rod to the mounting pole in a force-yielding manner, the other of said straight rods passing between the eyes of said plurality of short rods and the inner face of said open-spiral rod and serving to lock the trip-wires against sidewise removal from the open-spiral rod.

### Claim 7 (depends on 6)

The device according to claim 6, wherein said open-spiral rod is flattened so that its spiral are each of a width substantially less than its length, said pair of straight rods being disposed on opposite sides of said flattened spiral rod.

### Claim 8 (depends on 5)

The device according to claim 5, wherein said rod means comprises a single straight rod passing through said axial conduit and through all the eyes of said plurality of short rods.