US2988995A - Projectile fuze - Google Patents

Projectile fuze Download PDF

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Publication number
US2988995A
US2988995A US707294A US70729458A US2988995A US 2988995 A US2988995 A US 2988995A US 707294 A US707294 A US 707294A US 70729458 A US70729458 A US 70729458A US 2988995 A US2988995 A US 2988995A
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United States
Prior art keywords
rotor
fuze
pin
projectile
detonator
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
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US707294A
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English (en)
Inventor
Charles A Somville
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Individual
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Individual
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B30/00—Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
    • F42B30/04—Rifle grenades
    • 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
    • F42C15/192—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 rotatable in a plane which is parallel to the longitudinal axis of the projectile
    • 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
    • F42C15/30—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids of propellant gases, i.e. derived from propulsive charge or rocket motor

Definitions

  • the present invention relates to fuzes for projectiles and is carried out byemployment of a rotor type detonator holder.
  • the invention has reference more particularly to fuzes which are mounted to the base of projecticles and take advantage from the propellent gases launching them. It is a primary object of the invention to provide a secure fuze for such projectiles, which, like rifle grenades or mortar shells, are stabilized on their trajectory by fins and which are of moderate velocity and acceleration.
  • rotor type detonator holders for the arming of fuzes is well known in the art.
  • Such rotors which are provided to maintain the detonator separated from the booster and the high explosive charge of the projectile, have, generally, spherical, cylindrical or ellipsoidal shapes.
  • Fuzes of the kind found in the prior art usually involve a mechanism to make the rotor turn, such mechanism being actuated by means responsive to the rotation of the projectile or by linearly responsive rack and pinion gear trains.
  • Still others propose to take advantage of the driving torque exerted on a rotor which has its center of mass distant from the axis of rotation.
  • the aforedescribed means are precluded from being applied to numerous projectiles of small dimensions, moderate velocity and acceleration, and of the fin stabilized non-rotating type. Ammunition of the kind must, in addition, be rather cheap.
  • Typical projectiles of this kind showing all of the foregoing characteristic features are rifle grenades, though the invention, without departing from its spirit and scope, can be applied to all other ammunition categories, such as mortar shells, rockets, etc., be they actuated by nose or by base fuzes and no matter whether these fuzes represent a mechanic, electric or other mechanism.
  • a cylindrical rotating member referred to hereinafter as a rotor, disposed within said rotor, in a plane parallel to its base, a tubular detonator to ignite the explosive charge, and a spiral spring, which, upon launching of the projectile, is released and turns the rotor about its axis.
  • FIG. 1 is a side view partly in section of the warhead of a rifle grenade as example for one of the various possible applications of the invention, with the fuze in an unarmed or safe condition.
  • FIG. 2 is a cross section view of the fuze forming the subject matter of this invention in an unarmed position.
  • FIG. 3 is a side view of the fuze in an armed position.
  • FIG. 4 is a cross section of the fuze in an armed position.
  • FIG. 5 is a side view showing, as a detail of the invention, the notched lever and the cover plate of the fuze cage.
  • the cage 3 of the fuze forming the subject matter of this invention is secured by suitable means, such as by threaded engagement or by press fit, to the base of warhead 1 of a rifle grenade comprising a high explosive charge 2 of the Munroe type. While the outer faces of cage 3 conform to the adjacent receptacle formed in the base of warhead 1 and may be flat or convex, cover plate 4, secured to cage 3 by means of preferably three screws 5, is flat and centrally apertured for reception of one end of rotor shaft 6.
  • cover plate 4 secured to cage 3 by means of preferably three screws 5
  • An arcuate slot 8 equal in length, preferably, to
  • Rotor shaft 6 is received in a bore made in the base wall of cage 3.
  • Rotor 7 is substanits bases, is detonator 9' of, generally; tubular or truncated shape.
  • Pin 10 is secured to rotor 7 in such .a manner as to protrude from arcuate slot 8 when the fuze is as--muld.
  • Piston rod 11 extends into the fuze through a suitable bore in such a manner that it can be displaced in a plane parallel to cover plate 4 and pivot the notched lever 12.
  • the fulcrum of lever 12 may coincide with one of screws; 5. Disposed on the end of lever 12 is a nose which is:
  • Spiral spring 14 encircles the rotor shaft portion protruding from the central aperture in cover plate 4, one end of the spring is secured to one of the screws 5, the other end being secured in a suitable manner to pin 10 of rotor 7.
  • FIG. 1 shows the relation of the parts of the fuze in the unarmed position with detonator 9 in a plane normal to the projectile axis, as indicated by dotted lines in FIG. 1. If by reason of a filing pin 15, represented schematically in FIG. 1 at the left end of cage 3, is caused to more forward it would not strike percussion detonator 9, but a metallic part of rotor 7, so that absolute safety as to premature actuation of the fuze is insured.
  • firing pin 15 Upon impact of the projectile on the target, firing pin 15 is by inertia or otherwise thrown forward and strikes detonator 9, which explodes and sets off the main charge 2 either by a direct blast or by means of a suitable auxiliary charge 16, which could be made integral with cage 3.
  • a fuse for projectiles comprising a housing having a bore therein, an arming rotor in said bore rotatable from an unarmed position to an armed position, a cover for said housing and adjacent the rotor, said cover having an arcuate peripheral slot therein, a setting pin mounted in said rotor and extending into and through said slot, blocking means for said pin rotatably mounted on the cover, means connected to said blocking means to free said pin relative to said housing so that the latter will rotate said rotor into the armed position, and spring means connected to the cover and the pin to urge the pin to .slide in the slot from the unarmed to the armed position of the rotor.
  • said blocking means is in the form of a lever one end of which is rotatably mounted on the cover and the other end is provided with a nose engaged in a hole in said cover, and said lever having a notch therein intermediate its ends to receive said pin and retaining it at the upper end of said arcuate slot against the force of the spring means,
  • a fuse according to claim 2 wherein a piston rod is slidably mounted in the fuse and in contact with said lever, said piston rod being actuated by the propellent gasses of said projectile to pivot said lever out of engagement with said pin Whieh'is then urged to slide in said arcuate slot by said spring means, thus simultaneously rotating said rotor from the unarmed to the armed position.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
US707294A 1957-01-21 1958-01-06 Projectile fuze Expired - Lifetime US2988995A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE2988995X 1957-01-21

Publications (1)

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US2988995A true US2988995A (en) 1961-06-20

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Application Number Title Priority Date Filing Date
US707294A Expired - Lifetime US2988995A (en) 1957-01-21 1958-01-06 Projectile fuze

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US (1) US2988995A (is)
BE (1) BE554345A (is)
FR (1) FR1187397A (is)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930666A1 (de) * 1989-09-14 1991-03-28 Messerschmitt Boelkow Blohm Verriegelungsvorrichtung fuer eine sicherungseinrichtung

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE314716C (is) *
US1142375A (en) * 1914-11-24 1915-06-08 Henry N Sweet Exploding device for projectiles.
US1183503A (en) * 1914-10-03 1916-05-16 Bethlehem Steel Corp Base-fuse for explosive projectiles.
US2145507A (en) * 1936-12-31 1939-01-31 Sageb Sa De Gestion Et De Expl Percussion fuse for rocketprojectiles
US2479582A (en) * 1945-05-07 1949-08-23 James F Mccaslin Projectile fuse
US2511872A (en) * 1950-06-20 Electric fuse
US2663260A (en) * 1952-01-08 1953-12-22 Parke H Thompson Delayed arming mechanism
US2755737A (en) * 1947-11-25 1956-07-24 Allen S Clarke Rocket generator power supply
US2846949A (en) * 1956-02-14 1958-08-12 Apstein Maurice Arming of rifle grenades
US2850979A (en) * 1954-04-19 1958-09-09 Magnavox Co Time delay control means
US2872868A (en) * 1955-07-11 1959-02-10 Jr William J Donahue Missile nose fuze
US2883933A (en) * 1946-05-27 1959-04-28 Robert B King Fuze

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE314716C (is) *
US2511872A (en) * 1950-06-20 Electric fuse
US1183503A (en) * 1914-10-03 1916-05-16 Bethlehem Steel Corp Base-fuse for explosive projectiles.
US1142375A (en) * 1914-11-24 1915-06-08 Henry N Sweet Exploding device for projectiles.
US2145507A (en) * 1936-12-31 1939-01-31 Sageb Sa De Gestion Et De Expl Percussion fuse for rocketprojectiles
US2479582A (en) * 1945-05-07 1949-08-23 James F Mccaslin Projectile fuse
US2883933A (en) * 1946-05-27 1959-04-28 Robert B King Fuze
US2755737A (en) * 1947-11-25 1956-07-24 Allen S Clarke Rocket generator power supply
US2663260A (en) * 1952-01-08 1953-12-22 Parke H Thompson Delayed arming mechanism
US2850979A (en) * 1954-04-19 1958-09-09 Magnavox Co Time delay control means
US2872868A (en) * 1955-07-11 1959-02-10 Jr William J Donahue Missile nose fuze
US2846949A (en) * 1956-02-14 1958-08-12 Apstein Maurice Arming of rifle grenades

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930666A1 (de) * 1989-09-14 1991-03-28 Messerschmitt Boelkow Blohm Verriegelungsvorrichtung fuer eine sicherungseinrichtung

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Publication number Publication date
BE554345A (is)
FR1187397A (fr) 1959-09-10

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