US3344244A - Delayed-action tripping device - Google Patents

Delayed-action tripping device Download PDF

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Publication number
US3344244A
US3344244A US3344244DA US3344244A US 3344244 A US3344244 A US 3344244A US 3344244D A US3344244D A US 3344244DA US 3344244 A US3344244 A US 3344244A
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United States
Prior art keywords
tripping
diaphragm
pressure
pressure plate
delayed
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Expired - Lifetime
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C7/00—Fuzes actuated by application of a predetermined mechanical force, e.g. tension, torsion, pressure
    • F42C7/02—Contact fuzes, i.e. fuzes actuated by mechanical contact between a stationary ammunition, e.g. a land mine, and a moving target, e.g. a person
    • F42C7/04—Contact fuzes, i.e. fuzes actuated by mechanical contact between a stationary ammunition, e.g. a land mine, and a moving target, e.g. a person actuated by applying pressure on the ammunition head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C7/00—Fuzes actuated by application of a predetermined mechanical force, e.g. tension, torsion, pressure
    • F42C7/02—Contact fuzes, i.e. fuzes actuated by mechanical contact between a stationary ammunition, e.g. a land mine, and a moving target, e.g. a person
    • F42C7/04—Contact fuzes, i.e. fuzes actuated by mechanical contact between a stationary ammunition, e.g. a land mine, and a moving target, e.g. a person actuated by applying pressure on the ammunition head
    • F42C7/06—Contact fuzes, i.e. fuzes actuated by mechanical contact between a stationary ammunition, e.g. a land mine, and a moving target, e.g. a person actuated by applying pressure on the ammunition head and comprising pneumatic or hydraulic retarding means

Definitions

  • the present invention relates to improvements in de layed-action tripping devices and more particularly to pneumatic-actuated tripping devices suitable for firing explosive charges.
  • the present invention consists in a pneumatic delayedaction tripping device comprising a very limited number of sturdy, easily assembled pieces so as to result in an easy fabrication and a dependable operation.
  • the present invention can also be used for many applications other then the one said above, for instance for delayed-action switch or commutator controls and the like.
  • an improved tripping device comprises:
  • FIGURES 1 and 2 show respectively a plan view and a diametral section of a first form of embodiment of the tripping device according to the present invention, wherein the diiferent members are shown in their rest position.
  • FIGURE 3 shows in diametral section, the same device of FIGURES 1 and 2, however with the different members in the position in which they come to be as soon as the pressure plate has been lowered because of an external action.
  • FIGURES 4 and 5 show respectively, in a plan view and a diametral section, the same device as in the preceding figures, but wherein the different members are in the position they take up after the tripping.
  • FIGURES 6, 7 and 8 show, in a diametral section, another embodiment of the tripping device according to the present invention, and wherein the different members are respectively represented in the rest position, in the position they take up as soon as the pressure plate has been lowered, and finally in the position they take up after the tripping.
  • the form of embodiment illustrated in the FIGURES from 1 to 5 comprises: a body or casing 1, made of rigid material, closed on top by a cover or pressure plate 2, connected to the upper edge of the casing 1 by means of a flexible and gas-tight element 2'.
  • the inside of the space enclosed between the casing 1 and the cover 2 is divided in two chambers by a rigid diaphragm 3, having in its center a hole adapted to constitute a seat, with a certain play, for the sliding hollow stem or cylinder 2a, fast with the pressure plate 2.
  • a helical spring 4 and a small plunger 5 Inside the cavity of said stem 2a there are received a helical spring 4, and a small plunger 5, the cylindrical wall of the stem 2a having at a given point an opening 2d, the purpose of which shall be explained later.
  • a bladder or lung 8 of a flexible and elastic material, filled with air, and communicating with the upper chamber of the device in question.
  • the different members of the tripping device being the object of the present invention are in the position clearly illustrated in the FIGURES 1 and 2, and under these conditions said tripping device or igniter may be placed in the ground with cover 2, near the surface, now in a raised position, as it can be seen in FIGURE 2.
  • the spring 4 does not carry any load and the bladder 8 has its natural shape.
  • the locking lever 7 cannot rotate about its pivot 0 because its tooth 7b is in contact with the stem 2a of the pressure plate 2, and consequently the tooth 7c of said lever keeps the tripping member 6 in its cocked position as shown in FIG. 2.
  • the locking lever 7, pushed in turn by the tripping member 6, tends to rotate since its tooth 7b succeeds in penetrating into the opening 2d existing on the stem 2a of the pressure plate 2, but to lock it, intervenes the bladder 8 which, because of the sudden lowering of the pressure plate 2, and the consequent volume reduction of the air enclosed between it and the diaphragm, becomes inflated, opposing the displacement of the lever 7.
  • the load P persists on the pressure plate 2 (FIGURES 4 and 5) then, a few instants after the application of said load, the compressed air contained above the diaphragm 3 leaks through the clearance existing between the guiding cavity, fast to the diaphragm 3 and the stem 2a of the pressure plate, as long as there is reached a perfect balance between the pressure of the air contained above and that contained below the diaphragm 3.
  • the bladder 8 presents no resistance anymore to its crushing and accordingly the locking lever 7 rotates about its pivot 0, thus disengaging its tooth 70 from the tripping member 6 which, under the thrust of the spring 4, will snap sliding horizontally and bringing the firing pin fast with same against the percussion cap 9, thus causing its firing.
  • the device as illustrated in said figures comprises: a casing or body 11, a cover or pressure plate 12, connected with the upper edge of the casing 11 through an elastic ringshaped means 12a closing it hermetically.
  • the inner space thus resulting is divided in two parts by the rigid diaphragm 13, which has in its center a guiding hole or sleeve 13a, within which extends and slides the hollow cylindrical element 15 in the inside whereof are received a helical spring 14, and the tripping member 16, which in this instance has the shape of a cylinder or small plunger carrying at'its lower end the firing pin adapted to hit the percussion cap 19, arranged in the bottom of the casing 11.
  • the locking lever 17 On a section of the extension 13a of the diaphragm 13 there is pivotally connected the locking lever 17, through its pivot O. Laterally to same, in the diaphragm 13 there is foreseen a hole 1%, with guiding walls, within which slides the small piston 18.
  • the rod of said piston has a hole wherein there is inserted, so as to be able to effect some oscillations, the tail 17a of the lever 17, so that the piston 18 controls the movements of the lever 17, that is allowing same to carry out or not the rotation about its pivot O, as it will be better explained later.
  • the lever 17 further has also a tail 17b which, in the rest position, is in contact with the inner wall of the hollow plunger 15, and opposite its tail 17a a tooth 170, which is the element of said lever locking the tripping member 16 in a position away from the percussion cap 19, until the time when the blasting has to occur.
  • a delayed-action tripping device inoperative by sudden instantaneous stresses, which comprises, in combination a rigid casing enclosure and a pressure plate, with a flexible portion of said plate hermetically sealing said enclosure, a rigid diaphragm provided with a hole, said diaphragm dividing said enclosure into two non-airtight chambers; a slidable element, sliding into a hole in said diaphragm and actuated by the pressure plate against the bias of a spring; a tripping member; a locking means for locking said tripping member in its non-tripping position; and a delayed time means, said time means and said diaphragm being subjected to the prevailing pressure in either of the two chambers resulting from the pressure applied to the pressure plate, said delay means acting on said locking means allowing the locking means to be released from the tripping member only when persisting pressure is applied to the pressure plate.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US3344244D 1965-07-23 Delayed-action tripping device Expired - Lifetime US3344244A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO15906665 1965-07-23
NL6509996A NL6509996A (US20110232667A1-20110929-C00004.png) 1965-07-23 1965-08-02

Publications (1)

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US3344244A true US3344244A (en) 1967-09-26

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ID=26643915

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Application Number Title Priority Date Filing Date
US3344244D Expired - Lifetime US3344244A (en) 1965-07-23 Delayed-action tripping device

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US (1) US3344244A (US20110232667A1-20110929-C00004.png)
BE (1) BE684513A (US20110232667A1-20110929-C00004.png)
DE (1) DE1578503A1 (US20110232667A1-20110929-C00004.png)
NL (2) NL6509996A (US20110232667A1-20110929-C00004.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933095A (en) * 1973-03-05 1976-01-20 Technical Arco Establishment-Schaan Delayed action striking device which may be utilized for the priming of detonators
FR2600763A1 (fr) * 1986-06-27 1987-12-31 Lacroix E Tous Artifices Allumeur pour mine a plateau de pression

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465009A (en) * 1945-10-11 1949-03-22 Leland H Chase Concussion detonator
US2857842A (en) * 1956-03-12 1958-10-28 Malm Karl Olof Bertil Land mine
US3098439A (en) * 1959-06-04 1963-07-23 Rheinmetali G M B H Fa Land mine, more particularly anti-tank mine
GB948276A (en) * 1960-07-26 1964-01-29 Redon Trust Improvements in or relating to pneumatically-effected delayedaction tripping devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465009A (en) * 1945-10-11 1949-03-22 Leland H Chase Concussion detonator
US2857842A (en) * 1956-03-12 1958-10-28 Malm Karl Olof Bertil Land mine
US3098439A (en) * 1959-06-04 1963-07-23 Rheinmetali G M B H Fa Land mine, more particularly anti-tank mine
GB948276A (en) * 1960-07-26 1964-01-29 Redon Trust Improvements in or relating to pneumatically-effected delayedaction tripping devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933095A (en) * 1973-03-05 1976-01-20 Technical Arco Establishment-Schaan Delayed action striking device which may be utilized for the priming of detonators
FR2600763A1 (fr) * 1986-06-27 1987-12-31 Lacroix E Tous Artifices Allumeur pour mine a plateau de pression

Also Published As

Publication number Publication date
DE1578503A1 (de) 1970-10-22
NL133937C (US20110232667A1-20110929-C00004.png)
NL6509996A (US20110232667A1-20110929-C00004.png) 1967-02-03
BE684513A (US20110232667A1-20110929-C00004.png) 1967-01-03

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