US3585419A - Impact-operated electricity generator for projectiles - Google Patents

Impact-operated electricity generator for projectiles Download PDF

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Publication number
US3585419A
US3585419A US886201A US3585419DA US3585419A US 3585419 A US3585419 A US 3585419A US 886201 A US886201 A US 886201A US 3585419D A US3585419D A US 3585419DA US 3585419 A US3585419 A US 3585419A
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US
United States
Prior art keywords
striker
generator
impact
substance
receiving means
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.)
Expired - Lifetime
Application number
US886201A
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English (en)
Inventor
Francis Albert Daniel Andre
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Etat Francais
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Etat Francais
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Filing date
Publication date
Application filed by Etat Francais filed Critical Etat Francais
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Publication of US3585419A publication Critical patent/US3585419A/en
Anticipated expiration legal-status Critical
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
    • H02N11/002—Generators
    • H02N11/004—Generators adapted for producing a desired non-sinusoidal waveform

Definitions

  • a cap is mounted so as to transfer direct forces to a striker which in turn compresses a substance which responds by generating current.
  • the cap is mounted for translatory displacement which by a camlike action is converted into axial displacement of the striker to compress said substance.
  • This invention relates to impact-operated electricity generators for projectiles.
  • An object of the present invention is to provide an improved type of electrical current generators for projectiles, impactoperated and of high output even when the angle of incidence ofimpact is large.
  • the projectile tip undergoes a transverse shift by sliding onto a part called the striker.
  • the tip pushes this striker longitudinally to compress a ferroelectric or piezoelectric substance.
  • compression is transmitted, in known systems, with neither transverse motion nor sliding.
  • the priming power for a service charge is supplied by the above-noted compression of some piezoelectric or ferroelectric substance on impact.
  • Such substance is provided most frequently in the form of a ceramic pellet mounted in the forepart of the projectile, its axis being merged with or parallel to that of the projectile itself.
  • the present invention allows high efficiency to be obtained even when the impact angle of incidence is only slightly less than the limit permitted by the geometry of the projectile nose, and thus makes it possible to use a small-dimensioned ceramic pellet in a simple assembly as a current generator capable of starting through a wire or slotted conductor an electric explosive primer even when conditions are unfavorable.
  • the invention makes effective use of the radial components of the forces of compression which appear on impact, instead of using only their longitudinal component as in the standard assemblies.
  • the portion of the projectile located in front of the piezoelectric or ferroelectric substance consists essentially of: first a striker whose back face is designed to compress or percuss the front surface of said substance, and whose front face is planar or convex and preferably conical with a large aperture angle; second, a cap which under sufficient radial stress can relay a radial motion, on top of said striker, with a plane or concave part inside intended for pushing the striker and having a shape matching the latter and capable therefore of transmitting to the striker the compressive stresses arriving from the outer portion of such cap.
  • the operating principle of this device is as follows: on an impact at low angle of incidence, the generator according to this invention operates as do certain generators already known; the forepart ofthe cap is compressed by the target and transmits the force almost axially to the striker which likewise compresses the ferroelectric substance axially; on impact at high incident angle, the cap on the contrary undergoes a radially directed shift'and through sliding of its concave interior, previously described, on the convex front of the striker, communicates to this latter a compression motion or wave almost axial in direction, thus occasioning a compression of the ferroelectric substance under extremely favorable conditions.
  • the ferroelectric substance 1 is shown in the form of a ceramic pellet having two silvered surfaces which form terminals.
  • the cap 2 and anvil-piece 3 are connected to plug pins 4.
  • Striker 5 whose upper convex face in conical in this case, is held at a slight distance from the face of pellet l by an inside bolster 6 which can shear on impact.
  • This arrangement offers the double advantage of avoiding excessive compression of pellet 1 if acceleration factors on discharge of the missile are considerable, and of contributing a distinct improvement in the electrical output of the generator in relation to an assembly wherein the striker would be in direct contact with pellet 1 or 2.
  • Bracket 6 at the same time assures alignment of the striker movement.
  • Cap 7 rests on striker 5 and comprises a belt 8 which is shearable on impact at high incidence to allow the translatory radial motion previously described.
  • Cap 7 and striker 5 have cooperating camlike surfaces and 5a which convert transverse displacement of cap 7 into axial displacement of striker 5.
  • Substance 1 can be ferroelectric, piezoelectric, ferromagnetic or it can have any other properties which allow the direct or indirect generating of an electric current through application of a compressive force. Furthermore, it can be of any other character beside ceramic and can take on any other form beside that of a pellet.
  • a device for control of impedance can be incorporated into the electrical circuit in the form, for example of a thin insulating washer interposed between pellet l anvil-plate anvilplate 3 or in any form.
  • the sliding of the cap on the striker can be facilitated by a lubricant, surface treatment or any other process.
  • Striker 5 may or may not be separated by a small gap from cap 7 on the one hand, or from pellet 1 on the other.
  • the invention can be applied to all types of missile in which practically instantaneous operation is required no matter what the degree of incidence, and is particularly useful in cavitycharged missiles.
  • the invention thus provides a new type of electric generator for projectiles, which on impact delivers the electric power necessary for the operation of one or more electrical devices or other appliances.
  • This generator is particularly suitable for giving high efficiency on impacts at high angle of incidence.
  • the active part of the generator is a substance capable of supplying directly or indirectly electric power when undergoing static or dynamic compression.
  • This substance is compressed on impact by a part or subassembly called the striker, of which the forepart is of convex or planar shape, a conical shape of large aperture angle being particularly recommended.
  • This striker itself is surmounted by a device called the cap, comprising in its rear part facing the forepart of the striker a concave or planar face such that a shifting of the cap perpendicularly to the axis of the missile can, through sliding of the two facing surfaces of the striker and cap in relation to each other, cause a movement of the striker in the direction of the projectile axis.
  • the cap comprising in its rear part facing the forepart of the striker a concave or planar face such that a shifting of the cap perpendicularly to the axis of the missile can, through sliding of the two facing surfaces of the striker and cap in relation to each other, cause a movement of the striker in the direction of the projectile axis.
  • the cap On impact at low angle of incidence, the cap transmits the compressive force to the striker without any sliding of these two parts in relation to each other.
  • the cap On impact at a high angle of incidence, the cap can acquire a transverse movement slide on the face of the striker, and produce a longitudinal motion in this latter.
  • the movement of the striker is guided in such a way as to be only longitudinal.
  • the transverse movement of the cap is made possible by the existence of a section showing weak resistance to transverse stresses, a breakdown primer or any other process using or not using an impact break feature.
  • the assembly can comprise or not comprise a slight air gap between the striker and the active substance. If it does, the movement of the striker toward the active substance can be facilitated on impact by shearing or rupture of any part whatsoever of the assembly.
  • the assembly may comprise a slight air gap between striker and cap.
  • a lubricant, surface treatment or any other process may be used to facilitate the sliding of the cap on the striker.
  • Any device for impedance adjustment may be interposed in the electrical circuit between the source of power and the device it has to feed.
  • An impact-operated electrical current generator for a projectile comprising impact receiving means, support means supporting the impact receiving means for displacement, upon impact, axially or transversely relative to the projectile, a compression responsive substance adapted to generate electrical current, and striker means cooperating with the impact receiving means upon axial or transverse displacement of the latter to compress said substance to generate said current, said striker means and impact receiving means including mutually cooperating surfaces such that transverse displacement of said impact receiving means is converted into a substantially axial displacement of said striker means.
  • a generator as claimed in claim 1 comprising means to support the striker in spaced relation to said substance prior to impact.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Air Bags (AREA)
  • Catching Or Destruction (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Vibration Dampers (AREA)
US886201A 1968-12-19 1969-12-18 Impact-operated electricity generator for projectiles Expired - Lifetime US3585419A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR179258 1968-12-19

Publications (1)

Publication Number Publication Date
US3585419A true US3585419A (en) 1971-06-15

Family

ID=8658638

Family Applications (1)

Application Number Title Priority Date Filing Date
US886201A Expired - Lifetime US3585419A (en) 1968-12-19 1969-12-18 Impact-operated electricity generator for projectiles

Country Status (9)

Country Link
US (1) US3585419A (xx)
BE (1) BE742105A (xx)
DE (1) DE1963158C3 (xx)
DK (1) DK134794B (xx)
FR (1) FR1595412A (xx)
GB (1) GB1248868A (xx)
LU (1) LU60039A1 (xx)
NL (1) NL157983B (xx)
NO (1) NO125863B (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853058A (en) * 1972-01-05 1974-12-10 Luchaire Sa Improvements in or relating to rockets
US4104921A (en) * 1975-12-13 1978-08-08 Messerschmitt-Boelkow-Blohm Gmbh Piezoelectric acceleration transducer
US4215633A (en) * 1978-06-05 1980-08-05 The United States Of America As Represented By The Secretary Of The Navy Acoustic emission contact fuze with signal processing capability
US4417518A (en) * 1978-03-08 1983-11-29 Diehl Gmbh & Co. Detonating arrangement for missiles
US5014062A (en) * 1973-11-23 1991-05-07 The United States Of America As Represented By The Secretary Of The Navy Electronic projectile impact spotting device
US20080011178A1 (en) * 2006-07-13 2008-01-17 Nexter Munitions Impact fuse
US7434516B1 (en) * 2006-02-16 2008-10-14 The United States Of America As Represented By The Secretary Of The Navy Ferroelectric transmitters for warhead design and battle damage assessment
US9103635B1 (en) * 2014-12-16 2015-08-11 PBE Associates, Trustee for Piezoelectric pebble explosive CRT Trust Piezoelectric pebble explosive

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3230525A1 (de) * 1982-08-17 1984-02-23 Dynamit Nobel Ag, 5210 Troisdorf Mine zur bekaempfung von landfahrzeugen
CH650330A5 (fr) * 1983-03-07 1985-07-15 Mefina Sa Fusee a tete perforante pour projectile.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703530A (en) * 1951-11-27 1955-03-08 Francis E Mcgee Point detonating fuse
US2892411A (en) * 1951-12-06 1959-06-30 Calvin F Brown Crystal point detonation fuze
GB980380A (en) * 1961-06-02 1965-01-13 U M A L Sa Improvements in or relating to missiles
US3196794A (en) * 1959-06-18 1965-07-27 Robert C Meade Piezo-electric fuse device
US3320890A (en) * 1965-05-06 1967-05-23 Thomas Q Ciccone Piezo-electric detonation initiator system
US3356026A (en) * 1964-11-10 1967-12-05 Dynamit Nobel Ag Piezoelectric igniter for projectiles

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764091A (en) * 1945-04-27 1956-09-25 Colin M Hudson Piezoelectric fuse
FR1137953A (fr) * 1954-12-13 1957-06-06 Mécanisme de percussion amorçant l'explosion des projectiles et des grenades
NL260236A (xx) * 1960-01-29 Energa
AT224512B (de) * 1961-02-01 1962-11-26 Oerlikon Buehrle Ag Aufschlagzünder
BE630831A (xx) * 1963-04-10 1963-07-31
CH458136A (de) * 1966-06-10 1968-06-15 Oerlikon Buehrle Holding Ag Aufschlagzünder

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703530A (en) * 1951-11-27 1955-03-08 Francis E Mcgee Point detonating fuse
US2892411A (en) * 1951-12-06 1959-06-30 Calvin F Brown Crystal point detonation fuze
US3196794A (en) * 1959-06-18 1965-07-27 Robert C Meade Piezo-electric fuse device
GB980380A (en) * 1961-06-02 1965-01-13 U M A L Sa Improvements in or relating to missiles
US3356026A (en) * 1964-11-10 1967-12-05 Dynamit Nobel Ag Piezoelectric igniter for projectiles
US3320890A (en) * 1965-05-06 1967-05-23 Thomas Q Ciccone Piezo-electric detonation initiator system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3853058A (en) * 1972-01-05 1974-12-10 Luchaire Sa Improvements in or relating to rockets
US5014062A (en) * 1973-11-23 1991-05-07 The United States Of America As Represented By The Secretary Of The Navy Electronic projectile impact spotting device
US4104921A (en) * 1975-12-13 1978-08-08 Messerschmitt-Boelkow-Blohm Gmbh Piezoelectric acceleration transducer
US4417518A (en) * 1978-03-08 1983-11-29 Diehl Gmbh & Co. Detonating arrangement for missiles
US4215633A (en) * 1978-06-05 1980-08-05 The United States Of America As Represented By The Secretary Of The Navy Acoustic emission contact fuze with signal processing capability
US7434516B1 (en) * 2006-02-16 2008-10-14 The United States Of America As Represented By The Secretary Of The Navy Ferroelectric transmitters for warhead design and battle damage assessment
US7568430B1 (en) 2006-02-16 2009-08-04 The United States Of America As Represented By The Secretary Of The Navy Battle damage assessment system
US20080011178A1 (en) * 2006-07-13 2008-01-17 Nexter Munitions Impact fuse
US7661363B2 (en) * 2006-07-13 2010-02-16 Nexter Munitions Impact fuse
US9103635B1 (en) * 2014-12-16 2015-08-11 PBE Associates, Trustee for Piezoelectric pebble explosive CRT Trust Piezoelectric pebble explosive

Also Published As

Publication number Publication date
GB1248868A (en) 1971-10-06
FR1595412A (xx) 1970-06-08
NL157983B (nl) 1978-09-15
DE1963158C3 (de) 1983-11-17
BE742105A (xx) 1970-05-04
DE1963158B2 (de) 1980-08-28
DE1963158A1 (de) 1971-01-14
NO125863B (xx) 1972-11-13
LU60039A1 (xx) 1970-03-18
DK134794C (xx) 1977-06-06
DK134794B (da) 1977-01-17
NL6918832A (xx) 1970-06-23

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