US3349709A - Piezoelectric generators for ammunition - Google Patents

Piezoelectric generators for ammunition Download PDF

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Publication number
US3349709A
US3349709A US398303A US39830364A US3349709A US 3349709 A US3349709 A US 3349709A US 398303 A US398303 A US 398303A US 39830364 A US39830364 A US 39830364A US 3349709 A US3349709 A US 3349709A
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US
United States
Prior art keywords
generator
pad
shield
impact
aforesaid
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
US398303A
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English (en)
Inventor
Vilbajo Jean
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.)
Contigea SA
Original Assignee
Contigea SA
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Filing date
Publication date
Application filed by Contigea SA filed Critical Contigea SA
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Publication of US3349709A publication Critical patent/US3349709A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

  • the problem thus mainly consists in introducing into the generator, without diminishing the velocity of the actual projectile, means which are able to prevent the collapse -by shearing of the material, before the appearance into the generator of a compression effort which is considerable, respectively sufficient for generating the necessary electric current.
  • This means will therefore, without diminishing the own velocity of the projectile, have to enable the transfer to the grenerator, at the proper moment, of the static pressure capable of producing the deformation previous to the piezoelectric effect.
  • a first means consisted in putting over the generator an elastic cap which thus forms, so to say, the tip of the shell. It is hoped, by this means, to delay somewhat the instant of actual transmission of the impact effects onto the generator, which in this instance, is evidently quite questionable, this delay being essentially variable, depending for instance on the angles of impact, considering namely that the deformation of the elastic masses can here take place in all directions.
  • the present invention concerns improvements which, contrary to the various means which have been suggested before, fulll the essential condition which consists not only in securing a braking effect and a delay of the impact effort transmitted to the generator, but also and mainly in securing simultaneously a reduction of the pressure wave amplitude, so that this amplitude should not be altogether transmitted to the ferro-electric material.
  • the improvements according to the present invention essentially consist in putting, in front of the piezoelectric device, in a totally closed housing with rigid walls, an elastic shield-pad the volume of which is slightly smaller than that of the housing itself.
  • This shield-pad is placed between the generator and the tip of the shell. It will generally consist of a mass of some elastic material suc-h as natural or artificial rubber, Whose form shall be slightly diierent from that of its housing in order to leave a certain spacing between them.
  • the housing shall preferably be limited by the cooperation of a lixed part and a mobile part co-axial to it, aforesaid mobile part being able, under the effect of the impact, to move in the axial direction, being duly guided thereby by the xed part in order to compress and distort aforesaid shield-pad, the pressure waves being thus partially absorbed by the latter under duly predetermined conditions and the transmission to the generator of the pressure waves whose intensity has thus been reduced taking place under the optimum conditions required for obtaining the piezoelectric eifect.
  • FIGURE l illustrates a radial section of an improved piezoelectric generator conforming to the present invention, in its resting or standby position;
  • FIGURE 2 is similar to FIGURE l, but the generator is represented in the position following an impact.
  • the shield-pad 1 is placed in a housing provided between the nose 2 and the generator 3 with the help of the pistons 4-5 and of an intermediate ball 6.
  • the housing 7 of aforesaid shield-pad 1 on the one hand, and the form and/ or the dimensions thereof on the other hand, are such that there is in aforesaid housing 7 at least one free space 8.
  • the difference between the volumes of aforesaid housing 7 and aforesaid shield-pad is suiciently restricted for preventing the pressure waves from being transmitted, although it is not sufficiently restricted for delaying the application of the pressure to the projectile.
  • the shield-pad 1 shall preferably be made of rubber and the latter shall be of such quality that, on account of its comparatively low density and the velocity with which sound is transmitted through the actual rubber material, aforesaid shield-pad 1 prevents the passage of the pressure wave.
  • This particular feature should be considered in its wider sense.
  • This diiference of volume may either be due to a difference of dimensions, to a difference of form or also to the presence of hollow parts provided either in the shield-pad, in its housing, or in both of them.
  • the free spaces between the actual shield-pad and its housing might be lled by a material which is considerably more subject to deformation, respectively to compression, than the actual shield-pad.
  • a material which is considerably more subject to deformation, respectively to compression than the actual shield-pad.
  • Such kind of construction might for instance be applied by using a shield-pad of at least two different materials of which one would form the actual shield-pad whilst the other would act as a filler with a much higher deformability, respectively elasticity, than the actual shield-pad.
  • the present invention concerns such an improved electric fuse as well as any projectile fitted therewith.
  • a projectile comprising a head, a hollow nose displaceably mounted in said head, said nose having rigid walls partly extending beyond said head and partly eX- tending into said head, a piston slidably mounted in said hollow nose between said walls, said walls and said piston enclosing a chamber, an elastic shield-pad mounted on said piston and located within said chamber, a piezoelectric element mounted in said head, and means operatively connecting said piezoelectric element with said piston.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Toys (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
US398303A 1963-09-30 1964-09-22 Piezoelectric generators for ammunition Expired - Lifetime US3349709A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE637974 1963-09-30
BE652466 1964-08-31

Publications (1)

Publication Number Publication Date
US3349709A true US3349709A (en) 1967-10-31

Family

ID=25655577

Family Applications (1)

Application Number Title Priority Date Filing Date
US398303A Expired - Lifetime US3349709A (en) 1963-09-30 1964-09-22 Piezoelectric generators for ammunition

Country Status (8)

Country Link
US (1) US3349709A (fr)
BE (2) BE652466A (fr)
CH (1) CH414402A (fr)
DE (1) DE1215555B (fr)
FR (1) FR1408559A (fr)
GB (1) GB1022946A (fr)
IL (1) IL22134A (fr)
NL (2) NL6411176A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622814A (en) * 1970-06-22 1971-11-23 Us Navy Negatively charging piezoelectric power supply
US3984738A (en) * 1973-05-14 1976-10-05 Braun Aktiengesellschaft Piezoelectric igniter for lighters
US4026214A (en) * 1974-12-07 1977-05-31 Rheinmetall G.M.B.H. Impact fuze for artillery shell
US4037517A (en) * 1976-09-24 1977-07-26 The United States Of America As Represented By The Secretary Of The Navy Fuze activation device
US4723087A (en) * 1985-09-09 1988-02-02 Raychem Ltd. Piezoelectric impact sensor
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
US5166469A (en) * 1990-03-29 1992-11-24 Giat Industries Delay fuse for sequentially detonating shaped charges
US5341062A (en) * 1991-11-12 1994-08-23 The Whitaker Corporation Piezoelectric energy generator
US5485788A (en) * 1994-09-27 1996-01-23 Hughes Missile Systems Company Combination explosive primer and electro-explosive device
US5536990A (en) * 1991-03-27 1996-07-16 Thiokol Corporation Piezoelectric igniter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535748C3 (de) * 1975-08-11 1985-08-29 Diehl GmbH & Co, 8500 Nürnberg Sicherheitsvorrichtung für Piezozünder von Geschossen
DE2558836C3 (de) * 1975-12-27 1985-07-11 Diehl GmbH & Co, 8500 Nürnberg Elektrischer Geschoßzünder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849957A (en) * 1953-01-27 1958-09-02 Bofors Ab Explosive projectile
US2892411A (en) * 1951-12-06 1959-06-30 Calvin F Brown Crystal point detonation fuze
US3031968A (en) * 1958-04-09 1962-05-01 Thomas De W Dowdell Piezo-electric fuze
US3202100A (en) * 1961-06-02 1965-08-24 U M A L Sa Piezo-electric firing mechanism

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006280A (en) * 1954-04-13 1961-10-31 Aircraft Armaments Inc Fuze

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892411A (en) * 1951-12-06 1959-06-30 Calvin F Brown Crystal point detonation fuze
US2849957A (en) * 1953-01-27 1958-09-02 Bofors Ab Explosive projectile
US3031968A (en) * 1958-04-09 1962-05-01 Thomas De W Dowdell Piezo-electric fuze
US3202100A (en) * 1961-06-02 1965-08-24 U M A L Sa Piezo-electric firing mechanism

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622814A (en) * 1970-06-22 1971-11-23 Us Navy Negatively charging piezoelectric power supply
US3984738A (en) * 1973-05-14 1976-10-05 Braun Aktiengesellschaft Piezoelectric igniter for lighters
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
US4026214A (en) * 1974-12-07 1977-05-31 Rheinmetall G.M.B.H. Impact fuze for artillery shell
US4037517A (en) * 1976-09-24 1977-07-26 The United States Of America As Represented By The Secretary Of The Navy Fuze activation device
US4723087A (en) * 1985-09-09 1988-02-02 Raychem Ltd. Piezoelectric impact sensor
US5166469A (en) * 1990-03-29 1992-11-24 Giat Industries Delay fuse for sequentially detonating shaped charges
US5536990A (en) * 1991-03-27 1996-07-16 Thiokol Corporation Piezoelectric igniter
US5341062A (en) * 1991-11-12 1994-08-23 The Whitaker Corporation Piezoelectric energy generator
US5485788A (en) * 1994-09-27 1996-01-23 Hughes Missile Systems Company Combination explosive primer and electro-explosive device

Also Published As

Publication number Publication date
DE1215555B (de) 1966-04-28
FR1408559A (fr) 1965-08-13
NL6411176A (fr) 1965-03-31
BE652466A (fr) 1964-12-16
NL134582C (fr)
BE637974A (fr)
GB1022946A (en) 1966-03-16
IL22134A (en) 1968-07-25
CH414402A (fr) 1966-05-31

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