EP0098640A1 - Dispositif de mise à feu d'une amorce de projectile - Google Patents

Dispositif de mise à feu d'une amorce de projectile Download PDF

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Publication number
EP0098640A1
EP0098640A1 EP83200939A EP83200939A EP0098640A1 EP 0098640 A1 EP0098640 A1 EP 0098640A1 EP 83200939 A EP83200939 A EP 83200939A EP 83200939 A EP83200939 A EP 83200939A EP 0098640 A1 EP0098640 A1 EP 0098640A1
Authority
EP
European Patent Office
Prior art keywords
striker
primer
crystal
housing
electrodes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83200939A
Other languages
German (de)
English (en)
French (fr)
Inventor
Roger Beuchat
Edmond Butschi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mefina SA
Original Assignee
Mefina SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mefina SA filed Critical Mefina SA
Publication of EP0098640A1 publication Critical patent/EP0098640A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C11/00—Electric fuzes
    • F42C11/02—Electric fuzes with piezo-crystal

Definitions

  • Devices for firing a projectile primer comprising a striker acting on a piezoelectric element placed between two electrodes and intended to supply the electrical energy necessary for firing the primer, comprising a step-down transformer to connect the electrodes of the piezoelectric element to the primer.
  • the invention aims to improve the energy efficiency of the firing device.
  • the invention also aims to combine the security offered by low impedance primers and the simplicity advantages of a firing device constituted by a piezoelectric element.
  • the device according to the invention is characterized in that the piezoelectric element is constituted by a disc-shaped crystal placed in a housing of circular cylindrical shape, a movable part having a circular cylindrical portion being slidably mounted in said housing, this movable part being subjected to the action of a spring to exert an initial pressure on the crystal, this part being arranged on the path of the striker, but distant from the latter, so as to transmit to the piezoelectric element the shock produced by the striker coming to abut against this mobile part.
  • the firing device is mounted in a projectile rocket comprising an annular part 1.
  • This device comprises a low impedance primer 2 mounted in a primer holder 3.
  • the primer holder 3 is retained by a timer mechanism 4 provided with a finger 5 in the position illustrated in the drawing, in which there is an interruption of the pyrotechnic chain, since the primer 2 is placed at a place where it cannot communicate fire to a detonator 6 , from which it is separated by a partition 7.
  • the above arrangement is well known in the art and is therefore not described in more detail.
  • the front part of the rocket is provided with an annular part 8 having a rim 9 for retaining a striker 10 constituted by a cap made of synthetic resin, in which is embedded a part 11 made of metal, such as steel or hard brass.
  • the striker 10 is kept pressed against the internal surface of the rim 9 by a spring 12 bearing against a sleeve 13 of insulating resin.
  • This sleeve 13 constitutes a housing for a movable metal part 14 slidingly mounted inside this sleeve and subjected to the action of a spring 15 bearing against its front face and against the striker.
  • the part 14 is called a hammer and is separated from the striker by a distance of a few millimeters.
  • the part 14 is pressed elastically against a piezoelectric element 16 constituted by a disk-shaped crystal.
  • This crystal is disposed at the bottom of a housing of circular cylindrical shape delimited by the sleeve 13 and the front face of the annular part 1 forming an anvil.
  • the crystal 16 is therefore clamped between two metal parts which are intended to exert on it the forces necessary for obtaining the ignition voltage and which at the same time constitute the electrodes for taking this voltage.
  • the voltage supplied by the crystal 16 upon impact is brought to a transformer 17 retained in a sleeve 18 in the annular part 1, the input conductors of the transformer being constituted, on the one hand, by the part 1, and , on the other hand, by a metal rod 19 in contact with the hammer 14 via an elastic blade 20.
  • the transformer 17 is a step-down transformer and, thanks to the fact that it must transmit pulses of very short duration, it can be constituted simply by two coaxial windings without iron carcass. In principle, these two windings are carried on a coil, the central part of which constitutes a non-ferrous core for the said coils.
  • the secondary winding of the transformer 17 is connected by conductors not shown to electrical contacts to bring the ignition voltage to the primer 2 at low impedance when the latter has arrived in its firing position, after the expiration of the expected time for safety of mouth. These electrical contacts can for example be combined with the locking finger 5.
  • the arrangement described is very advantageous, since the crystal is held firmly on its two faces and on its periphery, so that it can withstand very high pressures without its functioning being compromised. Excellent results are obtained by providing a slight bending and a slight convexity of the faces of the parts 1 and 14 which bear against the faces of the crystal, the latter being flat. The measurements demonstrated that when the striker struck the hammer 14, this the latter has a resonance phenomenon, so that the crystal produces at least two successive voltage spikes.
  • the striker acquires a high speed at the time of impact, it strikes vigorously the part 14 and a very brief, but very high pressure is obtained, which is favorable from the point of view of the electrical voltage.
  • the masses displaceable during impact are limited to the mass of the striker, the latter being mainly constituted by the mass of the metal part 11 and like
  • the resin cap of the striker is relatively large, the firing device has a high sensitivity and can operate during impacts on very soft ground, for example on loose snow.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Catching Or Destruction (AREA)
EP83200939A 1982-06-29 1983-06-23 Dispositif de mise à feu d'une amorce de projectile Withdrawn EP0098640A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH397482A CH648110A5 (fr) 1982-06-29 1982-06-29 Dispositif de mise a feu d'une amorce de projectile.
CH3974/82 1982-06-29

Publications (1)

Publication Number Publication Date
EP0098640A1 true EP0098640A1 (fr) 1984-01-18

Family

ID=4267437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200939A Withdrawn EP0098640A1 (fr) 1982-06-29 1983-06-23 Dispositif de mise à feu d'une amorce de projectile

Country Status (5)

Country Link
EP (1) EP0098640A1 (es)
CH (1) CH648110A5 (es)
DK (1) DK297283A (es)
ES (1) ES523646A0 (es)
FI (1) FI832364A0 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121494A1 (fr) * 1983-03-07 1984-10-10 Mefina S.A. Fusée à tête perforante pour projectile

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987998A (en) * 1948-06-08 1961-06-13 Seth W Booth Fuze for a bomb
US3624451A (en) * 1970-05-04 1971-11-30 Avco Corp Efficient low voltage piezoelectric power supply
CH543065A (fr) * 1971-09-06 1973-10-15 Sarmac Sa Dispositif de mise à feu électrique de la charge explosive d'un projectile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987998A (en) * 1948-06-08 1961-06-13 Seth W Booth Fuze for a bomb
US3624451A (en) * 1970-05-04 1971-11-30 Avco Corp Efficient low voltage piezoelectric power supply
CH543065A (fr) * 1971-09-06 1973-10-15 Sarmac Sa Dispositif de mise à feu électrique de la charge explosive d'un projectile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0121494A1 (fr) * 1983-03-07 1984-10-10 Mefina S.A. Fusée à tête perforante pour projectile

Also Published As

Publication number Publication date
ES8503125A1 (es) 1984-06-01
CH648110A5 (fr) 1985-02-28
DK297283A (da) 1983-12-30
ES523646A0 (es) 1984-06-01
FI832364A0 (fi) 1983-06-28
DK297283D0 (da) 1983-06-28

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE DE FR GB IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19840213

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BEUCHAT, ROGER

Inventor name: BUTSCHI, EDMOND