US3435767A - Safety device for a projectile - Google Patents

Safety device for a projectile Download PDF

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Publication number
US3435767A
US3435767A US630926A US3435767DA US3435767A US 3435767 A US3435767 A US 3435767A US 630926 A US630926 A US 630926A US 3435767D A US3435767D A US 3435767DA US 3435767 A US3435767 A US 3435767A
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US
United States
Prior art keywords
projectile
charge
shaft
support
shell
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
US630926A
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English (en)
Inventor
Arne Stav
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.)
Forsvarets Forskningsinstitutt
Original Assignee
Forsvarets Forskningsinstitutt
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Publication date
Application filed by Forsvarets Forskningsinstitutt filed Critical Forsvarets Forskningsinstitutt
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Publication of US3435767A publication Critical patent/US3435767A/en
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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
    • 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
    • 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
    • F42C15/18—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved
    • F42C15/188—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved using a rotatable carrier
    • 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
    • F42C15/28—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids
    • F42C15/295—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids operated by a turbine or a propeller; Mounting means therefor

Definitions

  • the invention relates to projectiles whose explosive charges are ignited electrical by proximity fuses, altitude responsive circuits and similar devices which produce an igniting pulse under desired conditions not themselves relevant to this invention.
  • the object of the invention is the provision of a projectile in which the electrical ignition circuit is inter rupted, and the explosive train, normally consisting at least of a detonator charge, a primer charge, and a main charge, is not established until the projectile has travelled at least over a portion of its trajectory from a launching site toward a target.
  • the projectile of the invention is equipped with a support carrying one of the afore-mentioned three explosive charges, and movable toward and away from a position of alignment of the one charge with the other two charges in which the primer charge is interposed between the detonator and main charges to form the explosive train of the projectile.
  • Biocking means normally block the support in a position remote from the position of alignment, and the external circuit which can connect a source of an electric igniting pulse with the detonator charge is interrupted.
  • actuating means causes the support to move from the remote position to the position of alignment, and inactivates the circuit opening means which interrupts the external circuit.
  • FIG. 1 shows the nose portion of a shell equipped with the priming mechanism of the invention in a side elevational and partly sectional view;
  • FIG. 2a shows the mechanism of the shell of FIG. 1 in an axially sectional plan view on a larger scale
  • FIG. 2b shows the mechanism of FIG. 2a in an axially sectional side elevational view
  • FIG. 3 is a fragmentary view of the apparatus of FIG. 1 in section on the line III-III;
  • FIG. 4 shows a portion of the apparatus of FIG. 1 in section on the line IVIV.
  • FIG. 1 there is seen the nose portion of a shell, the front end of which is protected by a rubber cap 31 until the shell is ready to be fired.
  • a radial turbine 1 When the cap is removed, a radial turbine 1 is exposed.
  • the turbine is operated in the flying projectile by the ambient air and drives an electric generator and the input shaft of a speed reducing gear transmission, the generator and transmission being housed in respective axial sections 2, 3 of the conical nose portion and not being visible in the drawing.
  • Another axial nose section 4 encloses electronic gear energized by the afore-mentioned generator to provide a suitably timed detonating pulse in a manner known in itself.
  • the priming mechanism of the shell with which this invention is more specifically concerned is installed in the cylindrical portion 30 of the shell in a housing 8 provided with a metallic insert 18 and an insulating insert 7.
  • the drive shaft 5 of the priming mechanism is splined to the output shaft 3 of the afore-mentioned transmission, not otherwise shown, so that it rotates coaxially with the transmission shaft as long as the splines couple the two shafts to each other, but is axially movable relative to the transmission shaft, and disengageable by such axial movement.
  • the shaft 5 carries fine threads 6 which are received in mating internal threads of the insulating insert 7 in the inoperative position of the mechanism shown in the drawing.
  • Coarse threads 14 on the shaft 5 in a cavity 17 of the insert 7 threadedly engage a nut 16 which carries two prongs 15.
  • a helical compression spring 24 axially interposed between the nut 16 and a radial face of the insulating insert 7 biases the nut 16 toward the right, as viewed in FIGS. 2a and 2b, and thereby tends to pull the shaft 5 out of engagement with the output shaft 3 of the speed reducing transmission.
  • the insert 18 is generally cup-shaped and encloses the insert 7.
  • a tubular outward projection 19 on the bottom of the cup provides a bearing for a disc 10 also seen in FIG. 3.
  • a torsion spring 20 is coiled about the projection 19. One end of the spring is held in a radial bore 23 of the projection 19. The other end 21 engages a radial groove 22 in the disc 10.
  • An axial recess in the disc 10 is filled with an explosive primer charge 12 which is offset from axial alignment with a detonator 11.
  • the detonator is secured in axially aligned bores of the inserts 7, 18 by a sleeve 34.
  • a contact pin 27 of the detonator projects into an annular groove 25 in the radial front face of the insert 7 which is normally closed by a cover 9.
  • a leaf spring 26 The two ends of a leaf spring 26 are looped under tension in the groove 25 over the contact pin 27 of the detonator 11 and over a holding pin 28, as is best seen in FIG. 4.
  • the pin 28 is axially slidable in the inserts 7, 18 and biased by a spring (not shown) into abutting engagement with an imperforate face portion of the disc 10 in the illustrated position of the apparatus.
  • a stud 28a on one of the prongs 15 is axially aligned with a portion of the groove 25 near the pin 28 and near a contact pin 29 in the groove 25, which is connected with one output terminal of the detonating circuit in the nose portion 4, the
  • the main explosive charge of the shell, or a booster charge 13 are contiguously adjacent the frangible rear wall of the housing 8.
  • the holding pin 28 is axially aligned with a portion of the circumferentially elongated bore 10b, and drops into the bore, thereby releasing the spring 26, which strikes the stud 28a, and stopping the disc 10.
  • the stud 28a is withdrawn from the groove 25, and the spring 26 relaxes or expands further until its free end strikes the contact pin 29, thereby closing the external circuit between the non-illustrated electronic gear in the nose section 4 and the detonator 11.
  • the explosive train of the shell is now armed or primed.
  • the detonator 11 is set off, thereby causing explosion of the aligned primer charge 12 which in turn ignites the main or booster charge 13 through an opening blasted in the insert 18.
  • a projectile having a shell, an electrically ignited detonating charge, a main explosive charge, a primer charge adapted to form an explosive train with said detonating charge and with said main explosive charge when aligned therewith, a source of an igniting pulse, an external detonating circuit adapted to connect said source to said detonating charge, and a safety device for preventing premature explosion of said main charge, said charges being arranged in said shell, the improvement in the safety device comprising:
  • circuit opening means for interrupting said external circuit; and i (d) actuating means responsive to movement of said projectile through ambient air over a predetermined distance for releasing said blocking means and moving said support from said remote position to said position of alignment, and for inactivating said circuit opening means to close said external circuit
  • said actuating means including an air operated motor, motion transmitting means operatively interposed between said motor and said support for moving the support in response to movement of said motor, said motion transmitting means including a shaft having an axis and adapted to be mounted in said projectile for threaded movement about said axis, coupling means for connecting said shaft to said motor and for rotating said shaft about said axis, said coupling means being responsive to the axial component of said threaded movement for disengaging said shaft from said motor, said actuating means further including resilient means urging said support to move from said remote position to said position of alignment, and said blocking means being connected to said shaft for releasing said support from said remote position in response to rotation of said shaft, said support being mounted in said projectile for
  • said actuating means further including circuit closing means responsive to said movement of said support into said position of alignment for closing said circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Separation Of Particles Using Liquids (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US630926A 1966-04-29 1967-04-14 Safety device for a projectile Expired - Lifetime US3435767A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO162801A NO120921B (en, 2012) 1966-04-29 1966-04-29

Publications (1)

Publication Number Publication Date
US3435767A true US3435767A (en) 1969-04-01

Family

ID=19909538

Family Applications (1)

Application Number Title Priority Date Filing Date
US630926A Expired - Lifetime US3435767A (en) 1966-04-29 1967-04-14 Safety device for a projectile

Country Status (7)

Country Link
US (1) US3435767A (en, 2012)
JP (1) JPS5113360B1 (en, 2012)
DE (1) DE1578472C3 (en, 2012)
GB (1) GB1177229A (en, 2012)
NL (1) NL149596B (en, 2012)
NO (1) NO120921B (en, 2012)
SE (1) SE323012B (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901156A (en) * 1973-01-10 1975-08-26 Kongsberg Vapenfab As Safety and arming device for fuses
US3906862A (en) * 1974-04-23 1975-09-23 Us Army Buckling protective fuze cap
US4248153A (en) * 1977-12-21 1981-02-03 A/S Kongsberg Vapenfabrikk Combination fuze for missiles
FR2583510A1 (fr) * 1985-06-14 1986-12-19 Eidgenoess Flugzeugwerk Emmen Dispositif d'amorcage avec palpeur telescopique pour un corps de munition, procede de fonctionnement et utilisation de ce dispositif

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834556A1 (de) * 1988-10-11 1990-04-12 Diehl Gmbh & Co Entsicherungseinrichtung mit drehfluegel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920568A (en) * 1952-01-03 1960-01-12 Rabinow Jacob Turbo-generator system
US2994272A (en) * 1956-03-23 1961-08-01 Henry D Saunderson Water discrimination fuze ball-bearing screw type
US3128705A (en) * 1960-07-21 1964-04-14 Hotchkiss Brandt Electric fuse for rocket
US3369488A (en) * 1946-05-31 1968-02-20 Globe Union Inc Electronically energized device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3369488A (en) * 1946-05-31 1968-02-20 Globe Union Inc Electronically energized device
US2920568A (en) * 1952-01-03 1960-01-12 Rabinow Jacob Turbo-generator system
US2994272A (en) * 1956-03-23 1961-08-01 Henry D Saunderson Water discrimination fuze ball-bearing screw type
US3128705A (en) * 1960-07-21 1964-04-14 Hotchkiss Brandt Electric fuse for rocket

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3901156A (en) * 1973-01-10 1975-08-26 Kongsberg Vapenfab As Safety and arming device for fuses
JPS50135900A (en, 2012) * 1973-01-10 1975-10-28
US3906862A (en) * 1974-04-23 1975-09-23 Us Army Buckling protective fuze cap
US4248153A (en) * 1977-12-21 1981-02-03 A/S Kongsberg Vapenfabrikk Combination fuze for missiles
FR2583510A1 (fr) * 1985-06-14 1986-12-19 Eidgenoess Flugzeugwerk Emmen Dispositif d'amorcage avec palpeur telescopique pour un corps de munition, procede de fonctionnement et utilisation de ce dispositif

Also Published As

Publication number Publication date
NO120921B (en, 2012) 1970-12-21
SE323012B (en, 2012) 1970-04-20
NL149596B (nl) 1976-05-17
DE1578472A1 (de) 1971-12-16
DE1578472C3 (de) 1979-03-01
DE1578472B2 (de) 1978-06-29
GB1177229A (en) 1970-01-07
NL6705327A (en, 2012) 1967-10-30
JPS5113360B1 (en, 2012) 1976-04-27

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