US3120187A - Projectiles fitted with an electric generator of the inertia type - Google Patents

Projectiles fitted with an electric generator of the inertia type Download PDF

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Publication number
US3120187A
US3120187A US91921A US9192161A US3120187A US 3120187 A US3120187 A US 3120187A US 91921 A US91921 A US 91921A US 9192161 A US9192161 A US 9192161A US 3120187 A US3120187 A US 3120187A
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United States
Prior art keywords
projectile
generator
acceleration
abutment
respect
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Expired - Lifetime
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US91921A
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English (en)
Inventor
Wyser Giulio
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.)
Brevets Aero Mecaniques SA
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Brevets Aero Mecaniques SA
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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
    • F42C11/04—Electric fuzes with current induction

Definitions

  • Such a generator is a device capable of producing an electric current of short duration by an induction effect resulting from a relative displacement of two elements movably mounted with respect to each other, under the effect of an acceleration imparted to one of them and transmitted through it with some delay to the other.
  • a generator is generally intended to charge a voltage source, such as a capacitor, capable of igniting, when the projectile strikes a target, the explosive charge of the projectile.
  • the invention is more especially but not exclusively concerned with projectiles undergoing, when launched, relatively low accelerations, which is the case in particular of rockets (accelerations ranging from 100 to 200 g.), grenades, either self-propelled or not, launched by means of a rifle (accelerations ranging from 1,000 to 2,000 g.), as compared with projectiles such as shells, for which the initial acceleration may be as high as 100,000 g.
  • the object of this invention is to provide a projectile of this kind which is better adapted to meet the requirements of practice than those known up to the present time and in particular concerning the reliability of operation of the electric generator thereof.
  • the generator is mounted movable in the projectile body so that, when the projectile is launched, the generator can have, in said body, a relative rearward displacement of non-negligible amplitude from a position where it is held, at rest, by holding means frangible under the effect of the acceleration imparted to said body upon launching, to a rear position where it is applied against a rear abutment of said body, whereby, when the projectile is launched, the generator holding means yield immediately and said generator, lagging by inertia with respect to the projectile body, is struck by said rear abutment when the projectile has already gathered speed so that the acceleration then imparted to said generator is considerably higher than the acceleration initially imparted to said projectile when it was launched.
  • FIG. 1 is a side view, with parts cut away and parts in cross section, of a grenade made according to the invention, the parts occupying the positions they have in the state of rest.
  • FIG. 2 is a similar View, the parts being in the positions they occupy immediately after the grenade has been launched.
  • the projectile shown by the drawings comprises, at the front, a warhead 1 and, toward the rear, a tubular extension 2 for fitting the grenade on a rifle.
  • the ignition device of this projectile comprises a circuit including a closing contact actuated upon impact on a target and a voltage source, for instance a capacitor, charged, when the projectile is being launched, by an inertia generator carried by the projectile.
  • FIG. 1 shows the construction of this generator 3. It comprises a coil 4 disposed coaxially with the projectile and along the axis of which can move, in the rearward direction, a bar magnet 5 held in forward position, before the projectile is launched, by frangible means such as a rigid wire 6, which permits transporting the projectile without risks in case of its being dropped but is sufficiently weak to break under the effect of an axial acceleration greater than a given value (hereinafter called critical acceleration) imparted to generator 3 and directed frontwardly.
  • critical acceleration a given value
  • the inertia generator 3 was rigidly mounted in the projectile body and therefore was subjected, upon launching, to the same acceleration as the projectile, which acceleration is relatively low in the case of a grenade.
  • the critical acceleration was chosen relatively close to this initial acceleration so that there were risks of misfire because the initial acceleration of the projectile was not much higher than the critical acceleration.
  • the object of the present invention is to overcome this drawback.
  • generator 3 is movable in the projectile body from a forward position (shown by FIG. 1), in which it is held before launching by frangible means capable of yielding under the effect of the initial acceleration of the projectile, to a rear position (shown by FIG. 2) where said generator is applied against a rear abutment 7 of the projectile body.
  • the casing of generator 3 is made in the form of a piston slidable in a cylindrical housing 8 formed in the projectile body between warhead 1 and the rear extension 2.
  • the rear abutment 7 consists of a kind of hollow plug the front face of which constitutes the abutment proper, this plug being kept in position by means of its flange 7a caught between the projectile body and the rearward extension 2 thereof.
  • the holding means for keeping generator 3 in forward position ahead of abutment 7 comprise a screw 9 the head of which consists of a frangible disc lit secured in the hollow plug forming abutment 7 by means of a locking sleeve 11 fixed in the plug.
  • the capacitor which forms the voltage source and is to be charged by generator 3 is mounted in a casing 12.
  • generator 3 Before launching, generator 3 is held by screw 9 and disc 10 in the position of FIG. 1.
  • the initial acceleration a causes disc 10 to be sheared off and generator 3 remains practically stationary (screw 9 sliding in sleeve 11) until abutment 7 strikes generator 3 (position shown by FIG. 2), thus imparting to said generator an acceleration A considerably greater than the initial acceleration a.
  • Wire 6 is then broken and bar 5 slides rearwardly with respect to coil 4.
  • the generator might be carried by said movable element so as to have the benefit of a shock producing a high forward acceleration.
  • a projectile the combination of a rigid body and an electric generator in said body, said generator comprising a first and a second element capable, by a relative movement with respect to each other, of producing an electric current, said first element being slidable in said body along the line of movement of said projectile, first frangible means between said first element and said body for yieldably opposing rearward displacement of said first element relative to said body, said body having a rigid abutment for said first element rearwardly thereof, said second element being slidable rearwardly with respect to said first element along the line of the movement of said projectile, and second frangible means mounted between said two elements for yieldably opposing rearward displacement of said second element with respect to said first element, said first frangible means yielding in response to the initial acceleration of said projectile and said second frangible means yielding in response to the acceleration imparted to said first element by said rigid abutment.
  • a combination according to claim 1 in which said body forms a cylindrical housing having its axis parallel to the direction of movement of the projectile, said first element being in the form of a piston slidable in said housing.
  • said abutment is a hollow plug fixed to the rear of said body
  • said first frangible means comprising a screw fixed to the rear of said first element and extending rearwardly through said plug, a frangible disc carried by the end of said screw located on the rear side of said plug. and means for holding said disc against the rear wall of said plug.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US91921A 1960-03-01 1961-02-27 Projectiles fitted with an electric generator of the inertia type Expired - Lifetime US3120187A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU38319 1960-03-01

Publications (1)

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US3120187A true US3120187A (en) 1964-02-04

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US91921A Expired - Lifetime US3120187A (en) 1960-03-01 1961-02-27 Projectiles fitted with an electric generator of the inertia type

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US (1) US3120187A (en))
CH (1) CH366777A (en))
DE (1) DE1140843B (en))
ES (1) ES265087A1 (en))
FR (1) FR1280547A (en))
GB (1) GB927055A (en))
NL (2) NL261509A (en))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981245A (en) * 1974-12-17 1976-09-21 General Electric Company Electrical setback generator
US4091733A (en) * 1977-02-17 1978-05-30 General Electric Company Electrical setback generator
EP1755196A2 (de) 2005-08-20 2007-02-21 Hirschmann Automation and Control Gmbh Steckverbinder mit einem an dem Gehäuse des Steckverbinders angeordneten unverlierbaren Dichtelement
US20150013560A1 (en) * 2012-02-29 2015-01-15 Detnet South Africa (Pty) Ltd Electronic detonator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH669454A5 (en)) * 1984-02-24 1989-03-15 Inventa Ag
CN106652689B (zh) * 2016-12-07 2022-08-02 南京信息工程大学 一种新型四极子磁力加速系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1858959A (en) * 1929-10-30 1932-05-17 Koch Leonhard Weft pile carpet
US2703530A (en) * 1951-11-27 1955-03-08 Francis E Mcgee Point detonating fuse
US2775941A (en) * 1946-12-23 1957-01-01 Harold J Plumley Magnetic inertia controlled fuze
US2825863A (en) * 1954-10-18 1958-03-04 Krupen Philip Energizer
US2911914A (en) * 1950-02-21 1959-11-10 Robert O Wynn Fuze for special shaped charge bomb

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE34951C (de) * E. L. ZALINSKI, Artillerie-Lieutenant in Washington D. C. V. St. A Elektrischer Geschofszünder
DE1052865B (de) 1957-11-30 1959-03-12 Diehl G M B H Zuendstromerzeuger fuer elektrische Zuender, insbesondere fuer Aufschlagzuender

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1858959A (en) * 1929-10-30 1932-05-17 Koch Leonhard Weft pile carpet
US2775941A (en) * 1946-12-23 1957-01-01 Harold J Plumley Magnetic inertia controlled fuze
US2911914A (en) * 1950-02-21 1959-11-10 Robert O Wynn Fuze for special shaped charge bomb
US2703530A (en) * 1951-11-27 1955-03-08 Francis E Mcgee Point detonating fuse
US2825863A (en) * 1954-10-18 1958-03-04 Krupen Philip Energizer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981245A (en) * 1974-12-17 1976-09-21 General Electric Company Electrical setback generator
US4091733A (en) * 1977-02-17 1978-05-30 General Electric Company Electrical setback generator
DE2806055A1 (de) * 1977-02-17 1978-08-24 Gen Electric Elektrischer ruecksetzgenerator
EP1755196A2 (de) 2005-08-20 2007-02-21 Hirschmann Automation and Control Gmbh Steckverbinder mit einem an dem Gehäuse des Steckverbinders angeordneten unverlierbaren Dichtelement
US20150013560A1 (en) * 2012-02-29 2015-01-15 Detnet South Africa (Pty) Ltd Electronic detonator
US9279645B2 (en) * 2012-02-29 2016-03-08 Detnet South Africa (Pty) Ltd Electronic detonator

Also Published As

Publication number Publication date
NL110002C (en))
FR1280547A (fr) 1961-12-29
NL261509A (en))
GB927055A (en) 1963-05-22
ES265087A1 (es) 1962-07-01
DE1140843B (de) 1962-12-06
CH366777A (fr) 1963-01-15

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