US3353489A - Impact fuze for a spinning projectile - Google Patents

Impact fuze for a spinning projectile Download PDF

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Publication number
US3353489A
US3353489A US528706A US52870666A US3353489A US 3353489 A US3353489 A US 3353489A US 528706 A US528706 A US 528706A US 52870666 A US52870666 A US 52870666A US 3353489 A US3353489 A US 3353489A
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US
United States
Prior art keywords
rotor
fuze
sleeve
casing
projectile
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
US528706A
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English (en)
Inventor
Berger Fritz
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.)
Rheinmetall Industrie AG
Original Assignee
Rheinmetall GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rheinmetall GmbH filed Critical Rheinmetall GmbH
Application granted granted Critical
Publication of US3353489A publication Critical patent/US3353489A/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
    • F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
    • F42C9/14—Double fuzes; Multiple fuzes
    • F42C9/16—Double fuzes; Multiple fuzes for self-destruction of ammunition
    • F42C9/18—Double fuzes; Multiple fuzes for self-destruction of ammunition when the spin rate falls below a predetermined limit, e.g. a spring force being stronger than the locking action of a centrifugally-operated lock
    • 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
    • F42C15/20—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
    • F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
    • F42C9/14—Double fuzes; Multiple fuzes
    • F42C9/16—Double fuzes; Multiple fuzes for self-destruction of ammunition

Definitions

  • a percussion fuze for spinning projectiles having means operative by centrifugal force to place the fuze in firing position as to the slidable firing pin and having a rotor adapted to be adjusted into an ignition position by the centrifugal force but held in non-ignition position during transport by a second rotor safety device.
  • the invention relates to an impact fuze for a spin ning projectile, the fuze having a rotor adapted to be righted into an ignition position under the effect of centrifugal force, and having an axially slidable striker pin bearing, in the transport position, against .a supporting surface of the rotor and securing it against movement to an ignition position.
  • the rotor In a known impact fuze for a spinning projectile having a rotor adapted to be righted into an ignition position by centrifugal force, the rotor has a supporting surface disposed transversely of the axis of the fuze and which is arranged as a bearing for movable blocking bodies of a locking device which are adapted to be brought out of contact with the rotor.
  • the locking device is provided, in turn, with movable release members for terminating the locking of the rotor and securing the blocking bodies against displacement when the rotor is in the transport position, the release members and the blocking bodies operating in succession and thereby releasing the rotor for righting or erection, the rotor being merely moved by friction.
  • a safety or securing element is displaced on firing and a shortening thereof thereby occurs, so that after the acceleration of the projectile is complete the blocking members are lifted away from the supporting surface of the rotor by centrifugal force.
  • the blocking members engage also below a shoulder of the striker pin and lift the latter while the blocking members move beyond the shoulder.
  • the rotor can now right itself into the ignition position. In this position the bore safety is at an end.
  • the blocking members may consist of four small blocks provided with conical surfaces or it may be a one-piece slide which is pushed aside by the centrifugal force and releases the striker pin in the process.
  • the blocking members determine the bore safety, i.e. as the blocking members fiy outwards they not only release the rotor for righting, but at the same time also free the striker pin. Particularly great bore safety cannot be achieved in this way.
  • the transport position of a centrifugal rotor is ensured by a striker pin which can be displaced on the longitudinal axis of the fuze. This is done by means of a flattened portion of the cylindrical surface of the rotor, against which the striker pin is supported.
  • a fusible pellet mounted in the tip of the fuze and which can be melted by the heat of the ram pressure due to the forward movement of the projectile and by which the striker pin is prevented from moving axially and thereby releasing the rotor, and, second, two arms articulated to the striker pin and having roller-shaped centrifugal bodies, which tend to draw the striker pin forward under centrifugal force and thereby release the rotor.
  • the pellet melts owing to the heat of the ram pressure, and the striker pin is drawn forward by the force of the centrifugal bodies and the rotor is able to right itself into the ignition position.
  • the bore safety is thereby at an end.
  • an impact fuze with a rotor safety device in which the locking means holding the rotor in the transport position consists of a split ring which can be expanded radially by centrifugal force and releases the rotor to such an extent that the latter is able to right itself from the transport position into the ignition position.
  • a blocking slide located in front of a flash hole in the fuze is moved aside, so that an ignition path from the rotor to the projectile charge is now exposed.
  • the problem underlying the invention is to produce an impact fuze for a spinning projectile in which a rotor adapted to be righted into the ignition position by centrifugal force is held in the transport position by an axially slidable striker pin which bears against a supporting surface of the rotor, the fuze being distinguished by an improved bore safety which is independent of external influences, in spite of the fact that its internal arrangement consists of only a few robust parts.
  • a second rotor safety device which consists of a blocking device Whose effect is terminated a known time after the first safety device has become inoperative.
  • the blocking device may consist of a coiled band adapted to expand radially and which is pretensioned and embraces the rotor over its full width when the rotor is in the transport position.
  • a coiled band adapted to expand radially and which is pretensioned and embraces the rotor over its full width when the rotor is in the transport position.
  • FIG. 1 shows in longitudinal section an impact fuze with a self-destroying arrangement and a coiled band in the transport position
  • FIG. 2 shows in longitudinal section the impact fuze illustrated in FIG. 1 after the bore safety is at an end.
  • the impact fuze illustrated consists of two main structural systems, namely a self-destroying system and the bore safety device system.
  • the self-destroying system is mounted in the front part of a fuze casing 1 and is followed at the rear by the bore safety device system.
  • the self-destroying system which is known per se, consists of a sleeve 2 with a bearing surface 3, a ball carrier 4 with balls 5, and a spring 6. These parts surround a fuze plunger 7, which has its upper (as seen in FIG. 1) end located behind a diaphragm 8 and extends at its lower end into a central bore in the ball carrier 4.
  • the lower part of the ball carrier 4 is in the form of a striker pin 4a with a projecting striker point 4b.
  • the striker point 4b extends into a blind bore 9a in a rotor 9, which is, in turn, mounted in a cavity formed between the sleeve 2 and the fuze body 10.
  • a percussion cap 12 is inserted in a central bore 11 in the rotor 9.
  • the lower end face of the striker pin 4a bears on a flat portion 13 of the rotor 9, the latter having also another fiat portion 14 extending parallel to the axis of the fuze and the width of which corresponds approximately with the distance between the sleeve 2 and the fuze body 10.
  • This flat portion 14 is surrounded by a coiled spring band 15 which is given a slight initial tension, which enables the band to form a compact spring bundle.
  • the coiled band 15 is housed in a cage 17 arranged at right angles to the axis of the fuze and symmetrically with respect to the axis of the rotor, the external diameter of the cage 17 being such that the internal diameter of the coiled band 15, when it is opened out as it expands outwardly, is larger than the outer diameter of the closed coil.
  • a central bore 16 in the fuze body Below the rotor 9 there is a central bore 16 in the fuze body.
  • the fuze operates in the following manner:
  • the rotor 9 In the transport position shown in FIG. 1, the rotor 9 has its axis symmetry in an inclined position with respect to the axis of the fuze. In this position, it is held both by the percussion pin 4a, which is subject to the effect of the spring 6, and by the coiled band 15, so that the striker point 412 cannot penetrate into the percussion cap 12 in the rotor 9 and nor can transmission of ignition take place, even in the event of the occurrence of premature ignition of the percussion cap 12.
  • the entire internal arrangement of the fuze remains in the transport position shown in FIG. 1.
  • the balls 5 are moved outwards along the bearing surface 3 of the sleeve 2, the balls pushing the axially displaceable parts, consisting of the ball carrier 4 and the fuze plunger 7, towards the upper end of the fuze in opposition to the force of the spring 6.
  • the striker pin 4a is lifted away from the flat surface 13 and the striker point 4b is lifted out of the blind bore 9a, so that the rotor 9 is no longer secured from this side.
  • the righting or erection of the rotor 9, however, is delayed by the coiled band 15, which begins to fly outward as the centrifugal force becomes operative, until the full peripheral surface of the rotor tiU 9 passes through the innermost turn of the outwardflying coiled band 15.
  • the range of flight designated as the bore safety margin has now been completed. If the fuze now strikes the target, the tip of the fuze and the fuze plunger 7 are forced in, and the percussion cap 12, which is now freely accessible in the rotor 9, is pierced by the striker point 4b and the percussion cap in turn causes detonation of the detonator (not shown) and thereby of the bursting charge via bore 16.
  • the ascended balls 5 hold the pretensioned spring 6 over a part of the trajectory under the effect of the centrifugal force. If, however, in the further course of the flight of the projectile, the speed of rotation of the projectile steadily decreases, there comes a moment when the axial component of the centrifugal force becomes smaller than the force of the spring 6, and the latter is able to cause the striker point 4b to move forward against the percussion cap 12 by way of the ball carrier 4, so as to cause in this way the self-destruction of the projectile at a predetermined point along its trajectory.
  • a percussion fuze for spinning projectiles comprising a casing having a front part and a rear part, a sleeve secured in the rear part of the casing and having a bearing surface, a ball carrier with balls mounted slidably in the casing and in the sleeve, and having a striker pin secured thereon, a fuze body secured in the rear part of the casing and spaced from the sleeve, a rotor mounted to rotate between the fuze body and the sleeve and having a coiled band around the rotor and having a percussion cap therein; and a fuze plunger slidably mounted in the casing and extending into the sleeve, said rotor being normally held in inoperative position by the coiled band and when the projectile is fired centrifugal spinning force will act on the band to hold the rotor in an unarmed position for a predetermined period of time so that when the balls in the ball carrier force the latter away from the
  • a percussion fuze according to claim 1 in which a cage is formed between the sleeve and the fuze body to accommodate the coiled band so that the latter will be arranged symmetrically in relation to a rotor axis.
  • a percussion fuze according to claim 1 in which a cage is formed between the sleeve and the fuze body to accommodate the coiled band so that the latter will be arranged symmetrically in relation to a rotor axis, and in which the outside diameter of the cage is dimensioned so that when the band is open, the inner diameter of the coil is larger than the outside diameter of the closed coil.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Air Bags (AREA)
  • Toys (AREA)
US528706A 1965-02-26 1966-02-21 Impact fuze for a spinning projectile Expired - Lifetime US3353489A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER39998A DE1259740B (de) 1965-02-26 1965-02-26 Aufschlagzuender fuer Drallgeschosse

Publications (1)

Publication Number Publication Date
US3353489A true US3353489A (en) 1967-11-21

Family

ID=7405950

Family Applications (1)

Application Number Title Priority Date Filing Date
US528706A Expired - Lifetime US3353489A (en) 1965-02-26 1966-02-21 Impact fuze for a spinning projectile

Country Status (6)

Country Link
US (1) US3353489A (de)
BE (1) BE676972A (de)
CH (1) CH432300A (de)
DE (1) DE1259740B (de)
GB (1) GB1133960A (de)
NL (1) NL6602380A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585935A (en) * 1967-06-09 1971-06-22 Brevets Aero Mecaniques Percussion fuse
US3871297A (en) * 1972-10-13 1975-03-18 France Etat Percussion fuses with a tilting rotor for gyratory projectiles
US4109583A (en) * 1976-04-09 1978-08-29 The United States Of America As Represented By The Secretary Of The Army Projectile fuze
US4159679A (en) * 1976-07-09 1979-07-03 The United States Of America As Represented By The Secretary Of The Army Projectile fuze

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
FR2533686B1 (fr) * 1982-09-24 1987-01-02 Manurhin Dispositif de securite a cage tournante pour projectile giratoire

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656793A (en) * 1945-12-13 1953-10-27 Remington Arms Co Inc Ammunition
US2682835A (en) * 1951-11-28 1954-07-06 Us Army Delay arming device
US2782717A (en) * 1952-07-03 1957-02-26 Mach Tool Works Oerlikon Admin Fuze
US2921527A (en) * 1957-04-06 1960-01-19 Brevets Aero Mecaniques Centrifugally armed percussion fuze
US3033115A (en) * 1958-06-12 1962-05-08 Brevets Aero Mecaniques Nose fuzes of the percussion type including a self-destruction device
US3112704A (en) * 1960-12-23 1963-12-03 Rheinmetall Gmbh Self-destroying fuze for a spinning projectile
US3136253A (en) * 1963-01-28 1964-06-09 Maxson Electronics Corp Delayed arming mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB257333A (en) * 1925-05-27 1926-08-27 Arthur Trevor Dawson Improvements in or relating to percussion fuzes for projectiles
DE960071C (de) * 1951-07-07 1957-03-14 Oerlikon Buehrle Ag Aufschlagzuender fuer Geschosse

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656793A (en) * 1945-12-13 1953-10-27 Remington Arms Co Inc Ammunition
US2682835A (en) * 1951-11-28 1954-07-06 Us Army Delay arming device
US2782717A (en) * 1952-07-03 1957-02-26 Mach Tool Works Oerlikon Admin Fuze
US2921527A (en) * 1957-04-06 1960-01-19 Brevets Aero Mecaniques Centrifugally armed percussion fuze
US3033115A (en) * 1958-06-12 1962-05-08 Brevets Aero Mecaniques Nose fuzes of the percussion type including a self-destruction device
US3112704A (en) * 1960-12-23 1963-12-03 Rheinmetall Gmbh Self-destroying fuze for a spinning projectile
US3136253A (en) * 1963-01-28 1964-06-09 Maxson Electronics Corp Delayed arming mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585935A (en) * 1967-06-09 1971-06-22 Brevets Aero Mecaniques Percussion fuse
US3871297A (en) * 1972-10-13 1975-03-18 France Etat Percussion fuses with a tilting rotor for gyratory projectiles
US4109583A (en) * 1976-04-09 1978-08-29 The United States Of America As Represented By The Secretary Of The Army Projectile fuze
US4159679A (en) * 1976-07-09 1979-07-03 The United States Of America As Represented By The Secretary Of The Army Projectile fuze

Also Published As

Publication number Publication date
GB1133960A (en) 1968-11-20
NL6602380A (de) 1966-08-29
BE676972A (de) 1966-07-18
DE1259740B (de) 1968-01-25
CH432300A (de) 1967-03-15

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