US3119335A - Projectiles fitted with and electric detonator operated by a generator of the inertia type - Google Patents

Projectiles fitted with and electric detonator operated by a generator of the inertia type Download PDF

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Publication number
US3119335A
US3119335A US92248A US9224861A US3119335A US 3119335 A US3119335 A US 3119335A US 92248 A US92248 A US 92248A US 9224861 A US9224861 A US 9224861A US 3119335 A US3119335 A US 3119335A
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United States
Prior art keywords
projectile
detonator
generator
sliding unit
housing
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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.)
Expired - Lifetime
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US92248A
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English (en)
Inventor
Wyser Ginlio
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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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/24—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected by inertia means

Definitions

  • 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 and grenades, either self-propelled or not, launched by means of a rifle.
  • 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 this time, in particular concerning safety in storing and transportation.
  • the projectile with which the invention is concerned contains an explosive charge provided with a housing into which the detonator can be engaged by a displacement from the rear toward the front, the detonator being movably mounted in the projectile body so as to be able to move, preferably through the action of return means, from an initial position of rest where it is located on the outside of said housing and in which it is kept by holding means frangible under the effect of the acceleration of the projectile upon launching thereof, to a forward position where it is engaged in said housing.
  • the generator is rigid with the detonator and forms therewith a sliding unit movable in the projectile body.
  • 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 position they have in the state of rest;
  • FIG. 2 is a similar view, the parts being shown in the position they occupy immediately after the grenade has been launched;
  • FIG. 3 is a similar view, the parts being shown in the position they finally occupy some time after the launching of the grenade.
  • the grenade shown by the drawings comprises at the front a war-head '1 containing an explosive charge 3 and toward the rear a tubular extension 2 for fitting this grenade on a rifle.
  • the detonator 4 which is to ignite charge 3 is adapted to be engaged by a frontward displacement into a housing 5, preferably provided with a lining, formed in the rear portion of said charge 3 and open at the rear.
  • this detonator 4 is movably mounted in the projectile body so as to be able to move, advantageously under the action of return means consisting of a spring 6, from an initial position of rest (FIG. 1) where said detonator is on the outside of housing 5 and in which position it is kept normally by frangible holding means (more explicitly described hereinalfter) capable of breaking under the effect of a suitable acceleration imparted to the projectile, to a front position (FIG. 3) where said detonator 4 is engaged in its housing 5.
  • return means consisting of a spring 6
  • the inertia generator 7, illustrated by FIG. 1, is made as follows. It comprises a coil 8 disposed coaxially with the 3,119,335 Patented Jan. 28, 1964 "ice projectile and along the axis of which can move, in the rearward direction, a bar magnet 9 held in forward position, before the projectile is launched, by frangible means such as a rigid wire 10, which permits of 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 '7 and directed frontwardly.
  • critical acceleration a given value
  • generator 7 and detonator 4 are fixed together, so as to form a single sliding unit mounted in a guiding housing 11 formed in the projectile body between the front part 1 and the rear part 2 of this projectile, the frangible holding means of detonator 4 therefore serving to keep this sliding unit in position of rest in housing 5.
  • detonator 4 and the casing 7 of the generator (which contains the voltage source, for instance a capacitor to be charged by it) form a single unit, it becomes unnecessary to provide flexible or sliding electric connection between different elements of the electrical firing system.
  • the sliding unit comprising detonator 4 and generator 7 is movable the projectile body by the effect of inertia and against the action of a return spring 6 from the initial 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 unit is applied against a rear abutment 12 of the projectile body.
  • the sliding unit 4, 7, before coming into the front position shown by FIG. 3, moves rearwardly in the projectile body where it is struck by the rear abutment 12, which instantaneously transmits its speed to said unit, thus imparting thereto an acceleration much higher than the acceleration undergone by the projectile when it was launched and also higher than the critical acceleration, so that wire 10 is broken.
  • the distance between the rear face of the sliding unit in its position of rest and rear abutment 12 and the strength of return spring 6' must be chosen such that the sliding unit is actually struck by abutment 12 after the projectile has been launched.
  • the holding means for keeping the sliding unit in its forward position of rest comprises a screw 13 carred by said unit and the head of which consists of a frangible disc 14 secured in the hollow plug forming abutment 12 by means of a locking sleeve 15 fixed in said plug.
  • the sliding unit 4-7 is held by screw 13 and disc 14 in the position of FIG. 1.
  • the initial acceleration causes disc 14 to be sheared and said sliding unit 4--7 remains practically stationary' in space, i.e. moves rearwardly with respect to the projectile body (screw 13 sliding in sleeve 15), until abutment 12 strikes the rear end wall of the casing of generator 7 thus imparting thereto a high acceleration which causes wire 10 to be broken, and bar 9 to slide to the rear of coil 8 (position shown by FIG. 2) thus producing the desired electric current to charge the voltage source (capacitor) of the electric firing device.
  • detonator 4- carries a forward extension 16 of such a length that it is already engaged in a housing 5 when the sliding unit 4, 7 is in its position of rest.
  • a projectile the combination of a rigid body, an explosive charge in said body, an electric detonator for said charge mounted slidable in said body along the line of projectile motion, said explosive charge being provided with a longitudinal recess open at the rear thereof and forming a housing adapted to accommodate said detonator in the front position thereof with respect to said body, an electric genenator of the inertia type connected with said detonator for supplying it with current, said generator having an element mounted rigid with said detonator, the whole of said detonator and said generator element forming a sliding unit in said projectile body, said generator being operative to supply electric current in response to the launching of said projectile, holding means interposed between said sliding unit and said projectile body for releasably keeping said unit in a position of rest with respect to said body where said detonator is located rearwardly of said explosive charge and not engaged in said housing, said holding means being releasable by the launching of the projectile, and means urging said
  • a projectile the combination of a rigid body, an explosive charge in said body, an electric detonator for said charge mounted slidable in said body along the line of movement of said projectile, said explosive charge being provided with a longitudinal recess open at the rear thereof and forming a housing adapted to accommodate said detonator in the front position thereof, an electric generator of the inertia type connected with said detonator for supplying it with current, said generator comprising a first element and a second element capable, by relative movement with respect to each other, of producing an electric current, said first element being rigid with said detonator, the whole of said first generator element and of said detonator forming a sliding unit movable in said projectile body in a direction parallel to the direction of movement of the projectile, first frangible means carried by said body for yieldably hold-ing said unit in a position of rest with respect to said body where said detonator is rearwardly of said explosive charge and not engaged in said housing, said body having a rigid abut
  • a combination according to claim 2 in which said body forms a cylindrical housing having its axis parallel to the direction of movement of the projectile, said first generator element being in the form of a piston slidable in said housing.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Catching Or Destruction (AREA)
  • Air Bags (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
US92248A 1960-03-03 1961-02-28 Projectiles fitted with and electric detonator operated by a generator of the inertia type Expired - Lifetime US3119335A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU38335 1960-03-03

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US3119335A true US3119335A (en) 1964-01-28

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US92248A Expired - Lifetime US3119335A (en) 1960-03-03 1961-02-28 Projectiles fitted with and electric detonator operated by a generator of the inertia type

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US (1) US3119335A (US20050192411A1-20050901-C00001.png)
CH (1) CH367088A (US20050192411A1-20050901-C00001.png)
DE (1) DE1140842B (US20050192411A1-20050901-C00001.png)
ES (1) ES265133A1 (US20050192411A1-20050901-C00001.png)
GB (1) GB929601A (US20050192411A1-20050901-C00001.png)
LU (1) LU38335A1 (US20050192411A1-20050901-C00001.png)
NL (2) NL261522A (US20050192411A1-20050901-C00001.png)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440962A (en) * 1966-05-12 1969-04-29 Karlsruhe Augsburg Iweka Device for igniting explosive charges
US3921937A (en) * 1972-06-03 1975-11-25 Dynamit Nobel Ag Projectile or rocket preferably with unfolded tail unit
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
US4637311A (en) * 1984-02-24 1987-01-20 Ems-Inventa Ag Method of, and apparatus for, increasing the energy in an electromagnetic fuze system
US4831934A (en) * 1985-12-23 1989-05-23 Mefina S.A. Fuse for an electric firing projectile
US20150013560A1 (en) * 2012-02-29 2015-01-15 Detnet South Africa (Pty) Ltd Electronic detonator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1858969A (en) * 1926-06-26 1932-05-17 Rheinische Metallw & Maschf Electric fuse for projectiles
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU31870A1 (US20050192411A1-20050901-C00001.png) * 1952-01-25

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1858969A (en) * 1926-06-26 1932-05-17 Rheinische Metallw & Maschf Electric fuse for projectiles
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 (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440962A (en) * 1966-05-12 1969-04-29 Karlsruhe Augsburg Iweka Device for igniting explosive charges
US3921937A (en) * 1972-06-03 1975-11-25 Dynamit Nobel Ag Projectile or rocket preferably with unfolded tail unit
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
US4637311A (en) * 1984-02-24 1987-01-20 Ems-Inventa Ag Method of, and apparatus for, increasing the energy in an electromagnetic fuze system
US4831934A (en) * 1985-12-23 1989-05-23 Mefina S.A. Fuse for an electric firing projectile
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
NL261522A (US20050192411A1-20050901-C00001.png)
GB929601A (en) 1963-06-26
ES265133A1 (es) 1961-08-16
DE1140842B (de) 1962-12-06
CH367088A (fr) 1963-01-31
LU38335A1 (US20050192411A1-20050901-C00001.png)
NL121387C (US20050192411A1-20050901-C00001.png)

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