US2155100A - Safety device for projectile fuses - Google Patents

Safety device for projectile fuses Download PDF

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Publication number
US2155100A
US2155100A US136060A US13606037A US2155100A US 2155100 A US2155100 A US 2155100A US 136060 A US136060 A US 136060A US 13606037 A US13606037 A US 13606037A US 2155100 A US2155100 A US 2155100A
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United States
Prior art keywords
projectile
fuse
safety
sphere
rotation
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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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US136060A
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English (en)
Inventor
Scelzo Luigi
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Individual
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Individual
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Publication of US2155100A publication Critical patent/US2155100A/en
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    • 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
    • F42C15/20—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a securing-pin or latch is removed to arm the fuze, e.g. removed from the firing-pin
    • F42C15/22—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a securing-pin or latch is removed to arm the fuze, e.g. removed from the firing-pin using centrifugal force
    • 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
    • F42C15/196—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 by the action of centrifugal or inertia forces on the carrier body, e.g. the carrier having eccentrically mounted weights or eccentric centre of gravity
    • 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
    • F42C15/26—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 using centrifugal force

Definitions

  • the safety device comprises usually masses whose centre of gravity is located at a certain distance from the axis of rotation of the projectile, so that after the shot, they may be displaced outwards towards the periphery, into suitable recesses, thus causing the fuse to be rendered active.
  • the object of the present invention is to provide a safety device on fuses for fire arms, in which the necessity of projecting outwards the safety masses, as well as their displacement towards the periphery is avoided.
  • the device according to the invention comprises a mass, the centre of gravity of which is preferably placed on the axis of rotation of the projectile, or at a small distance therefrom, which maintains its distance from it unaltered both before and after the shot.
  • the movement necessary for passing from the position of safety to the free position is obtained by assigning to the mass itself a form and structure such as to cause, under the action of the centrifugal force (or eventually of the pressures of inertia of the shot) a rotating couple tending to cause its rotation round the centre of gravity, thus bringing it into a well determined position with respect to the axis of the projectile, which corresponds to the active or non-safety position.
  • the safety mass therefore has no radial displacement as in the ordinary fuses, but rotates round its own centre of gravity.
  • the form and the structure of the safety mass is such that, considering in it two axes of rotation passing through the centre of gravity, which, for example, may be two axes of symmetry normal to each other, the centrifugal force generated by the rotation round one of said axes, may be greater housing the safety masses when they are dis-' than the centrifugal force which would be produced by the rotation around the other axis.
  • this movement is utilised to pass from the safety to the active positions.
  • Fig. 1 shows in the position of safety in longitudinal section a fuse of the type in which an outer detonator is provided, which operates by direct impact on the target, provided with a safety device according to the invention.
  • Fig. 2 shows the same form of device shown in Fig. 1, in the active position obtaining after the shot.
  • Fig. 3 shows the position of rest (before the shot) of the system of safety accordingto the invention, applied to an ordinary fuse, and
  • Fig. 4 shows the same form of device as shown in Fig. 3, in the active position (after the shot).
  • I is the body of the fuse, which together with the head 2 thereof, form a spherical cavity in which a sphere 3 is housed, provided with a hole containing two detonators (or detonating charges) 4 and 5.
  • a pin 6 is pushed by the spring 1 into the corresponding hole of the sphere 3, so as to keep it locked in the position of rest shown in Fig. 1.
  • the material of which the sphere is made must have a specific weight differing (greater or lower) from the mean specific weight of the material placed in the central hole, so as to generate a couple of rotation.
  • the sphere 3 Before the shot the sphere 3 is fixed in the position shown in Fig. 1 by means of the spindle 6, and the detonators are fully protected by the fuse head 2.
  • the pin 6 unlocks through the inertia. the sphere 3 by compressing the spring 1; the sphere however, does not rotate as the friction due to the pressure of inertia is greater than the rotating couple.
  • One of the detonators is thus brought to the end of the fuse head, so that it operates when said fuse head strikes the target.
  • the numerals 8 and 9 indicate two parts of the fuse body which de-' termine the spherical cavity in which the sphere I with its central hole II is located.
  • the locking pin l2 and the corresponding spring l3, operate similarly as described in the preceding example.
  • the detonator M (or other detonating charge) is placed below the sphere, while the upper hole may be empty (like the fuses operating aerodynamically) or may contain the striker,
  • the safety sphere may be placed at the end of the fuse head as shown in Figures 1 and 2.
  • a fuse for a projectile including a fuse body having a spherical bore therein, a spherical member in said bore having a diametrical passage extending entirely therethrough, the spherical surface of said member and the spherical bore of the fuse body constituting a universal mounting for said member, said spherical member being located with its center disposed substantially on the longitudinal axis of the projectile, whereby when the projectile is fired the centrifugal force of rotation of the projectile will cause the spherical member to take a position wherein the diametrical passage is aligned with the longitudinal axis of the projectile.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Carbon And Carbon Compounds (AREA)
US136060A 1936-04-17 1937-04-10 Safety device for projectile fuses Expired - Lifetime US2155100A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT488044X 1936-04-17

Publications (1)

Publication Number Publication Date
US2155100A true US2155100A (en) 1939-04-18

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ID=11268634

Family Applications (1)

Application Number Title Priority Date Filing Date
US136060A Expired - Lifetime US2155100A (en) 1936-04-17 1937-04-10 Safety device for projectile fuses

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US (1) US2155100A (d)
DE (1) DE705559C (d)
GB (1) GB488044A (d)
IT (1) IT341235A (d)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428380A (en) * 1941-01-27 1947-10-07 Harry J Nichols Fuse
US2441939A (en) * 1939-11-14 1948-05-18 Harry J Nichols Fuse
US2446019A (en) * 1939-11-07 1948-07-27 Harry J Nichols Detonating or impact fuse
US2450899A (en) * 1944-02-14 1948-10-12 Lyle K Liljegren Fuse
US2455603A (en) * 1943-04-14 1948-12-07 Nichols Harry James Fuse
US2495432A (en) * 1944-05-27 1950-01-24 Amp Corp Fuse
US2541603A (en) * 1943-05-07 1951-02-13 Harry J Nichols Fuse
US2656793A (en) * 1945-12-13 1953-10-27 Remington Arms Co Inc Ammunition
US3871297A (en) * 1972-10-13 1975-03-18 France Etat Percussion fuses with a tilting rotor for gyratory projectiles
US6237495B1 (en) * 1999-02-04 2001-05-29 Chartered Ammunition Industries Pte Ltd Self-destructing impact fuse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3165530D1 (en) * 1980-07-02 1984-09-20 Rheinmetall Gmbh Fuse for spinning projectiles
DE3132736A1 (de) * 1981-08-19 1983-03-17 Daimler-Benz Ag, 7000 Stuttgart "einrichtung zur selbsttaetigen erzeugung einer hubkraft zum zwecke der niveauerhaltung eines fahrzeugaufbaus, insbesondere kraftfahrzeugaufbau"

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446019A (en) * 1939-11-07 1948-07-27 Harry J Nichols Detonating or impact fuse
US2441939A (en) * 1939-11-14 1948-05-18 Harry J Nichols Fuse
US2428380A (en) * 1941-01-27 1947-10-07 Harry J Nichols Fuse
US2455603A (en) * 1943-04-14 1948-12-07 Nichols Harry James Fuse
US2541603A (en) * 1943-05-07 1951-02-13 Harry J Nichols Fuse
US2450899A (en) * 1944-02-14 1948-10-12 Lyle K Liljegren Fuse
US2495432A (en) * 1944-05-27 1950-01-24 Amp Corp Fuse
US2656793A (en) * 1945-12-13 1953-10-27 Remington Arms Co Inc Ammunition
US3871297A (en) * 1972-10-13 1975-03-18 France Etat Percussion fuses with a tilting rotor for gyratory projectiles
US6237495B1 (en) * 1999-02-04 2001-05-29 Chartered Ammunition Industries Pte Ltd Self-destructing impact fuse

Also Published As

Publication number Publication date
IT341235A (d) 1900-01-01
DE705559C (de) 1941-05-02
GB488044A (en) 1938-06-30

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