EP0433259B1 - A device for projectiles - Google Patents

A device for projectiles Download PDF

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Publication number
EP0433259B1
EP0433259B1 EP90850406A EP90850406A EP0433259B1 EP 0433259 B1 EP0433259 B1 EP 0433259B1 EP 90850406 A EP90850406 A EP 90850406A EP 90850406 A EP90850406 A EP 90850406A EP 0433259 B1 EP0433259 B1 EP 0433259B1
Authority
EP
European Patent Office
Prior art keywords
transmission element
projectile
firing
shaft
pin
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
EP90850406A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0433259A1 (en
Inventor
Lars Erik E. Sennerholm
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.)
MIPRO AB
Original Assignee
MIPRO AB
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 MIPRO AB filed Critical MIPRO AB
Priority to AT90850406T priority Critical patent/ATE95916T1/de
Publication of EP0433259A1 publication Critical patent/EP0433259A1/en
Application granted granted Critical
Publication of EP0433259B1 publication Critical patent/EP0433259B1/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
    • 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

Definitions

  • the present invention relates to a device for projectiles for translating an axial movement of a transmission element in the direction of firing of the projectile into a rotary movement for the actuation of means for initiating or arming the priming system of the projectile.
  • a device for projectiles for translating an axial movement of a transmission element in the direction of firing of the projectile into a rotary movement for the actuation of means for initiating or arming the priming system of the projectile.
  • the device according to the invention is used for arming of the priming system of a projectile it fulfills a need as a standard safety device for projectiles, which do not rotate or which rotate at a relatively low speed, such as mortar, tank and artillery ammunition, missiles, and bombs.
  • the device according to the invention is used for initiation of the priming system of a projectile, it is part of, for example, a system for delayed closing of an electric circuit in a priming system for direct initiation of a secondary explosive, such as EFI or laser priming devices.
  • Projectile rotation is thus not used as energy source for achieving the operation of the safety mechanism but instead in the embodiment shown said operation is achieved by using the acceleration of the projectile.
  • the rotary movement achieved by the device according to the invention is slowed down by a retarding device comprising a gear wheel and an armature means for achieving a time delay of an arming process.
  • the time delay is the ultimate guarantee for the safety in handling and firing of ammunition up to a point of time during the trajectory of the projectile when arming of the priming system can take place without endangering the person carrying out the firing.
  • An essential condition for the safety level of the detonator safety device is that the force urging the system into arming must not have been stored before the time of use, which condition is fulfilled by the disclosed device.
  • a detonator safety device comprising the device according to the invention consist of a substantially circular-cylindrical body 1 made up of several disc-shaped units, which body is mounted in the known way between a fuze and a booster charge in the front part of a projectile, such as a grenade, intended to be fired in the direction of the arrow P of Fig. 1 through the muzzle of a barrel of a weapon.
  • the body 1 encloses all of the details for maintaining the device in a safety position and for preventing said booster charge from being initiated by the fuze and for arming the device and for permitting initiation of the booster charge by means of a flame ejected from the fuze or by means of a pin projecting from the fuze.
  • Figs. 3 - 7 illustrate a rotor 2 which is turnably mounted about a shaft 3, which rotor has to be turned from the position shown in Figs 3, 5 and 7 to the position shown in Fig. 4, 6 and 8 in order for a lead charge 4 centrally disposed in the body 1 to detonate and actuate said booster charge in the projectile.
  • the rotor 2 is prevented from turning and is thus held in a safety position by a detension pin 5 which is axially movable between the upper position shown in Fig.
  • a retaining means in the form of, for example, a ball 6 having been moved out of engagement with a recess 2a on the periphery of the rotor.
  • the ball 6 is displaced out of said engagement after the detension pin 5, optionally against the action of a low spring force, has been released for downward movement of a retaining means in the form of, for example, a ball 7.
  • the ball In the safety position of the device, the ball is partly located in a ringshaped recess 5a of the detension pin 5 and cannot be displaced out of same owing to a retaining means in the form of a setback pin 8 preventing this.
  • the setback pin 8 by the action of the acceleration of the projectile, is displaced downwardly from the position shown in Fig.
  • Said device comprises, as its most essential portion, a transmission element 11 in the form of a hollow circular cylinder with two helicoidal grooves 12 round its periphery and two diametrically opposed, essentially semispherical recesses 13 at the lower part 13 of the element 11.
  • the transmission element 11 is axially displaceable and rotatably mounted in a cylindrical space 14 in the body 1. In this position the working surfaces of the element 11 are protected against knocks, bumps and other impact during transport, storage and handling of the device.
  • the element 11 In its upper safe position as shown in Fig. 3, the element 11 is pressed against a fixed portion 15 of the body 1 by a helical compression spring 16 which is cone-shaped so as to make it possible for adjacent helical turns to be inserted into each other when the spring is compressed and the spring therefore is to take up little axial space.
  • the spring 16 bears against the base plate 9 as well as against friction reducing means 17, comprising, for example, a metal plate bearing against the spring 16, and a Teflon plate disposed between the metal plate and the lower portion of the element 11.
  • the setback pins 8 and 20 are also subject to a downward force, and both the element 11 and the setback pins 8, 20 are brought at about the same time to their lower positions shown in Fig. 4 in continuous lines for the element 11 and in dotted lines for the setback pins 8, 20.
  • the axial downward movement of the setback pins 8, 20 is a controlled condition for the axial movement of the element 11 to the same position.
  • the controlled condition is that the balls 18, 19 are prevented by the setback pins 8, 20 from leaving their positions in the recesses 13.
  • a shaft 22 In the axial aperture of the transmission element 11 there is inserted a shaft 22.
  • the shaft 22 is turnably mounted in the base plate 9 and in a top plate 23.
  • the spring 16 and the plates 17 surround the shaft 22.
  • a pin 24 is mounted in a radial aperture in the shaft 22, one end 24a (Fig. 7) of the pin projecting over a distance from the mantle surface of the shaft 22.
  • the pin end 24a engages with an axial groove 25 in the axial aperture of the element 11.
  • the upper portion of the shaft 22 is provided with a gear 26 meshing with a gear 27 on a gear segment 28 (Figs. 3, 5 - 8).
  • the gear segment 28 is provided with a gear path 29, which through a gear wheel 30 operates an armature 31 of a conventional retarding device.
  • the armature 31 is provided with an oscillating movement by the gear wheel 30 about a shaft 32, whereby the counter clockwise turning of the segment 28 about the shaft 22 is delayed (slowed down) during
  • the gear segment 28 is provided with an open recess 33 and an oblong hole 34.
  • the recess 33 is movable from a safe position (Fig. 5), in which it is spaced from the centre hole in the body 1, to which the detonator 35 mounted in the rotor 2 may be brought, to an armed position (Fig. 6) in which the recess is opposite the centre hole.
  • the hole 34 surrounds a follower pin 36 mounted on the rotor 2.
  • the groove 12, the section of which is preferably rectangular, has such a steep gradient that the element 11 will turn with a considerable effect on the force achieved by the spring 16.
  • the means 17 ensures that friction between the spring 16 and the element 11 will be low.
  • a transmission element corresponding to the element 11 may be used for translating a rectilinear axial movement, caused, for example, by the acceleration of a projectile, into a rotary movement for closing or opening an electric circuit in a priming system for direct initiation of a secondary explosive or for achieving an adjustable time function for restricting the rotary movement so that the required amount of time will be provided, such as for use in connection with preset burst, in so called clockwork fuzes.

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  • General Engineering & Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Toys (AREA)
  • Saccharide Compounds (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
  • Surgical Instruments (AREA)
  • Radiation-Therapy Devices (AREA)
EP90850406A 1989-12-15 1990-12-11 A device for projectiles Expired - Lifetime EP0433259B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90850406T ATE95916T1 (de) 1989-12-15 1990-12-11 Vorrichtung fuer geschosse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8904244 1989-12-15
SE8904244A SE468961B (sv) 1989-12-15 1989-12-15 Anordning foer initiering eller osaekring av en projektils taendsystem

Publications (2)

Publication Number Publication Date
EP0433259A1 EP0433259A1 (en) 1991-06-19
EP0433259B1 true EP0433259B1 (en) 1993-10-13

Family

ID=20377789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90850406A Expired - Lifetime EP0433259B1 (en) 1989-12-15 1990-12-11 A device for projectiles

Country Status (6)

Country Link
EP (1) EP0433259B1 (sv)
AT (1) ATE95916T1 (sv)
DE (1) DE69003927T2 (sv)
DK (1) DK0433259T3 (sv)
NO (1) NO174175C (sv)
SE (1) SE468961B (sv)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7396442B2 (en) 2005-02-08 2008-07-08 Carleton Life Support Systems, Inc. Electrochemical oxygen generator module assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB672590A (en) * 1949-09-26 1952-05-21 Energa Improvements in or relating to safety devices for projectiles
US2789507A (en) * 1952-06-14 1957-04-23 Mach Tool Works Oerlikon Fuze for rocket projectiles
DE2643828C3 (de) * 1976-09-29 1980-09-11 Gebrueder Junghans Gmbh, 7230 Schramberg Zünder für drallarm zu verschießende Geschosse

Also Published As

Publication number Publication date
DE69003927D1 (de) 1993-11-18
DK0433259T3 (da) 1994-02-21
NO905407D0 (no) 1990-12-14
SE8904244D0 (sv) 1989-12-15
NO174175B (no) 1993-12-13
ATE95916T1 (de) 1993-10-15
NO174175C (no) 1994-03-23
NO905407L (no) 1991-06-17
SE468961B (sv) 1993-04-19
DE69003927T2 (de) 1994-05-19
EP0433259A1 (en) 1991-06-19
SE8904244L (sv) 1991-06-16

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