# US 5,345,874 A · Automatic ejection system for trip-wire type mines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,345,874 A - Document ID: US5345874A - Status: Granted - Kind: A - Application number: 07/888,595 - Filed: 1992-05-27 - Granted: 1994-09-13 - Earliest claimed: 1991-06-11 - Assignees: Giat Industries - Inventors: Georges G. Lemonnier; Bernard R. Roumat - Web page: https://patentgrep.com/patent/US5345874A ## CPC - F42B 23/24: Details - F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D) ## Abstract A trip wire type mine has a plurality of trip wires, each trip wire being wound on a reel and ejected through an opening in a body of the mine by means of an ejection system. The ejection system may include a cutting device to cut a lid in a plate forming a plane wall of the hollow body of the mine, a movable system to displace the cutting device, and a pyrotechnic charge to drive the movable system. A projectile is attached to one end of each trip wire, and the charge is also used to eject the plurality of projectiles through the opening, thereby deploying the trip wires and placing the mine in an operational state. ## Claims ### Claim 1 A trip-wire mine comprising: a hollow body accommodating a plurality of trip wires, wherein each trip wire is wound on a corresponding reel; and an automatic trip wire ejection system, the automatic ejection system comprising: a first device for freeing an opening in a wall of the hollow body of the mine, a plurality of projectiles, each projectile attached to a corresponding free end of one of the plurality of trip wires, and means to eject the plurality of projectiles through the opening in the body of the mine, the plurality of trip wires each simultaneously unreeling from the corresponding reels when the plurality of projectiles are ejected, wherein the first device comprises a cutting means mounted in the body of the mine adjacent the wall to cut a lid from said wall, and a second device for ejecting the lid. ### Claim 2 A trip-wire mine having a hollow body, a plurality of trip wires and a plurality of projectiles located within said hollow body, each projectile attached to a corresponding free end of one of the plurality of trip wires, the hollow body comprising: two plane parallel faces, a first one of said two faces serving as a support on a ground; and a cutting means having a cutting plate abutting a second one of said two parallel faces, the cutting means integral with a movable system, said movable system comprising a piston that is telescopically displaceable with a pin along a first axis perpendicular to the cutting plate and passing through a center of the cutting plate, said cutting means cutting the second one of said two parallel faces. ### Claim 3 (depends on 2) The trip-wire mine of claim 2, wherein the movable system further comprises a device for ejecting a lid of the mine, the lid comprising a portion of the second one of said two parallel faces adjacent the cutting means. ### Claim 4 (depends on 2) The trip-wire mine of claim 2, wherein each of the two parallel faces of the hollow body of the mine is formed by a first plate, and wherein the cutting plate has a circular shape, the cutting plate being smaller than the first plate. ### Claim 5 (depends on 2) The trip-wire mine of claim 2, wherein a plurality of trip wire reels are flushly mounted on a first face of a first plate, the plurality of reels distributed in a circle centered on the first axis, and wherein an ejection system is mounted on a support located on a second face of the first plate, said support and said first plate defining a recess centered on the first axis, the movable system mounted in said recess, the movable system movable translationally. ### Claim 6 (depends on 5) The trip-wire mine of claim 5, wherein the piston of the movable system moves translationally along the first axis by, gas pressure of gases resulting from triggering of a pyrotechnic charge, said gases penetrating the recess of the movable system. ### Claim 7 (depends on 6) The trip-wire mine of claim 6, wherein each projectile is mounted in a corresponding ejection chamber oriented along a corresponding second axis, wherein each corresponding second axis forms a substantially 45.degree. angle with the first axis. ### Claim 8 (depends on 7) The trip-wire mine of claim 7, wherein each ejection chamber is formed in the hollow body and is associated with one of the plurality of trip wires. ### Claim 9 (depends on 7) The trip-wire mine of claim 7, wherein the ejection system ejects the projectiles by the gas pressure of the gases resulting from the triggering of the pyrotechnic charge, each ejection chamber communicating to the recess of the movable system through a connecting duct. ### Claim 10 (depends on 9) The trip-wire mine of claim 9, wherein the ejection system further comprises a timing device to delay the arrival of the gases in the ejection chambers. ### Claim 11 (depends on 10) The trip-wire mine of claim 10, wherein the pin forms the timing device, the pin circumferentially mounted around the piston to close the connecting duct, and wherein the pin is connected to the piston in a telescoping fashion to integrally translate with the piston and to open the connecting duct after a lid is cut, the lid comprising a portion of the second one of said two parallel faces adjacent the cutting means. ### Claim 12 (depends on 11) The trip-wire mine of claim 11, wherein the first plate of the ejection system comprises a stop limiting displacement of the movable system, the cutting plate is force-fitted onto the piston, and the lid and the cutting plate are ejected by inertia. ### Claim 13 (depends on 11) The trip-wire mine of claim 11, wherein the movable system, the cutting plate, and the lid are ejected from the hollow body of the mine by the gas pressure of the gases resulting from triggering of the pyrotechnic charge. ### Claim 14 (depends on 10) The trip-wire mine of claim 10, wherein the connecting duct comprises at least two annular chambers forming the timing device. ### Claim 15 (depends on 2) The trip-wire mine of claim 2, further comprising two ejection systems, wherein each ejection system is associated with a corresponding reel assemblies, each reel assembly mounted in the vicinity of one of the two plane parallel faces of the hollow body of the mine. ### Claim 16 (depends on 15) The trip-wire mine of claim 15, wherein the first one of said two faces rests on the ground, the ejection system adjacent to said first face being actuated before detonation of the mine to cause the mine to lift off the ground. ### Claim 17 A trip-wire mine having a hollow body, a plurality of trip wires and a plurality of projectiles located within said hollow body, each projectile attached to a corresponding free end of one of the plurality of trip wires, the hollow body comprising: two plane parallel faces, a first one of said two faces serving as a support on a ground; a cutting means having a cutting plate abutting a second one of said two parallel faces, the cutting means integral with a movable system, said movable system displacable along the first axis perpendicular to the cutting plate and passing through a center of the cutting plate, said cutting means cutting an opening in the second one of said two parallel faces; and an ejection system for ejecting each of the projectiles through the opening in the second one of said two parallel faces. ### Claim 18 (depends on 17) The trip-wire mine of claim 17, wherein a plurality of trip wire reels are flushly mounted on a first face of a first plate, the plurality of reels distributed in a circle centered on the first axis, and wherein said ejection system is mounted on a support located on a second face of the first plate, said support and said first plate defining a recess centered on the first axis, the movable system mounted in said recess, the movable system movable translationally and comprising a piston mounted on the cutting plate. ### Claim 19 (depends on 18) The trip-wire mine of claim 18, wherein the piston of the movable system moves translationally along the first axis by gas pressure of gases resulting from triggering of a first pyrotechnic charge, said gases penetrating the recess of the movable system. ### Claim 20 (depends on 19) The trip-wire mine of claim 19, wherein each projectile is mounted in a corresponding ejection chamber oriented along a corresponding second axis, wherein each corresponding second axis forms a substantially 45.degree. angle with the first axis. ### Claim 21 (depends on 20) The trip-wire mine of claim 20, wherein each ejection chamber is formed in the hollow body and is associated with one of the plurality of trip wires. ### Claim 22 (depends on 21) The trip-wire mine of claim 21, wherein the ejection system ejects the projectiles by a gas pressure of gases resulting from triggering of at least one second pyrotechnic charge, wherein each ejection chamber communicates by a connecting duct with the recess of the movable system, said at least one second charge being located in the connecting duct. ### Claim 23 (depends on 22) The trip-wire mine of claim 22 wherein the ejection system further comprises a timing device to delay the triggering of the at least one second pyrotechnic charge. ### Claim 24 (depends on 23) The trip-wire mine of claim 23, wherein the timing device comprises a slow-burning pyrotechnic charge located in the connecting duct, said slow burning charge triggered by combustion of the first pyrotechnic charge and triggering the at least one second charge. ### Claim 25 (depends on 22) The trip-wire mine of claim 22, wherein the piston is ejected simultaneously with a lid of the mine, the lid comprising a portion of the second one of said two parallel faces adjacent the cutting means.