US2791963A - Fuse for an explosive projectile - Google Patents

Fuse for an explosive projectile Download PDF

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Publication number
US2791963A
US2791963A US463577A US46357754A US2791963A US 2791963 A US2791963 A US 2791963A US 463577 A US463577 A US 463577A US 46357754 A US46357754 A US 46357754A US 2791963 A US2791963 A US 2791963A
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US
United States
Prior art keywords
fuse
projectile
capacitor
circuit
ignition
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
US463577A
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English (en)
Inventor
Schuler Johannes Hermann
Theile Ulrich
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Saab Bofors AB
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Bofors AB
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Publication date
Application filed by Bofors AB filed Critical Bofors AB
Priority to US463577A priority Critical patent/US2791963A/en
Application granted granted Critical
Publication of US2791963A publication Critical patent/US2791963A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C11/00—Electric fuzes
    • F42C11/008—Power generation in electric fuzes
    • 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
    • F42C15/40—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein the safety or arming action is effected electrically
    • 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
    • F42C9/147—Impact fuze in combination with electric time fuze
    • 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

Definitions

  • FIG. 2 A INVENTORS JOHANNES HERMANN SCHULER ULRB C Ij THEILE ATTORNEY United States Fatent G FUSE FOR AN EXPLOSIVE PROJECTILE Johannes Hermann Schuler, Uterluss, Kreis Celle, and
  • the present invention relates to fuses for explosive projectiles and other missiles, and more particularly to self-arming and self-igniting fuses.
  • One of the objects of the present invention is to provide a novel and improved fuse of the general class above referred to, the operating mechanism of which is entirely inert when and as long as a projectile equipped with the fuse is at rest (as distinguished from a projectile in flight) and is automatically activated when the projectile is in flight.
  • Another object of the invention is to provide a novel and improved fuse having an operating mechanism actuated by a potential source of energy which produces the energy required for activating the fuse mechanism only in response to -a physical magnitude acting upon a projectile in flight but is entirely inert until the projectile is fired thereby effectively preventing a detonation of the projectile by accidental impact against its fuse or similar causes.
  • Still another object of the invention is to provide a novel and improved fuse with an operating mechanism including a circuit system which by the action of said physical magnitude for a predetermined period of time is energized sufliciently to initiate the ignition of the fuse in response to an impact caused for instance by the projectile hitting a target and which after a further predetermined period of time is energized sufficient to initiate the ignition of the fusewithout the agency of an i the advantage that iid ioi tq T nfuse b' j mea e m ed. q r djbyf h is aimed? A turt e nowadays ld t-9f the s i mpro edit a; .t s automaticallyfreverts J f, defect the mechanism fails: the fuse passed, or mother words if .projectilefis atdud... T
  • Fig. 1 is a sectional longitudinal view of a projectile equipped with a fuse according to the invention.
  • Fig. 2 is a circuit diagram of the operating mechanism of the fuse.
  • the projectile according to Fig. 1 comprises a shell 'case 1, to the forward end of which the fuse according to the invention is screwed, separated from the shell casing by a flanged screw washer 4.
  • the operating mechanism of the fuse is disposed within a metal fuse casing composed of a rear part 2 and a nose part 3.
  • a fuse according to the invention may also be mounted in or on a part of the projectile other than the nose end thereof, such as the rear part of the shell.
  • the shell case 1 is filled with bursting or explosive charges 5 and 6.
  • the relation and coaction of these two charges are not essential for the understanding of the invention.
  • the operating mechanism of the fuse which is disposed in casing 2, 3, comprises two preferably cylindrical capacitors 7 and 8, separated by a partition wall formed within-the fuse casing by casing part 2, a resistor 9 preferably fitted in an annular groove of said partition wall and a circuit control means in form of a discharge tube 10 fitted in the space circumscribed by capacitor 7.
  • the outer wall of capacitor 7 together With the respective wall portions of easing part 2 form an annular chamber 11 from which extend one or several rearwardly slanted ducts or channels 12 leading to the outside wall of fuse part 2.
  • Each of these channels is lined with a metal tube 13, electrically insulated from casing part 2.
  • the outer end of each channel 12 is plugged by means of a plug 14- made of lead or other comparative soft material.
  • the 'mechanism finally corru prises a switch '18" disposed in an aXiat-b'ore'of nose part 3 of the fusecasing Tlaisswitch is normally operrand can' -b clos'ed'by'an-imp'act experienced thepro'jectilejf or morei'specific'ally' by the fuse'thereof.
  • the switch is" 1 diagrammaticallys'hown as comprisinganupper contactlf 19and' a lower contact 19,*the latter being' insulated' from nose part 3 bya'n insulation disc 21'.
  • switch I 18- is connected-across the terminals of tube 10." Allthe components of the circuit system are, of course, 'lsuitahl y insulatedone froin member but the insulation'materials used for this purpose have preferably a finite value for a prposewhich be more fully: explainedv herein- A; isap'pare'iit, there 'is no energy"available which eration' of the fuse hereinbefoi'ef described, ,1
  • The; initial; period oftime betweennthe firing of. the: projectile; and, untilfcapacitm 8. reaches its, predetermined intermediate chargef constitutes a safety factor.
  • This safetyvfactort. can be conveniently controlled. by, suitably'correlating; the; capacitors and ..the resistor; it may be such thatlhetpror; jectile ⁇ must .tr'a'vel. a. distance between-.770 and. 200 -ft., or: more from the muzzlegof. the barrel beforetitsfuseuber comesarmed.
  • the. projectile isv not automatically destroyed when capaciton hasreached its maximum, finalcharge
  • the insulation materials used for insulating .the respective components ofthefuseare oflfi'nite values. These values are so selected that the charges ofcapacitors 7'and 8 are substantially dissipated. during the, time tlieprojectile is in flight. Consequently, theifusesis reverted to its initial energy-less or inoperativev condition at aboutthe time it falls back on the ground This feature permits service personnel to collect.duds.-and-- to disassemble the same without danger and also protects. the civilian population.
  • capacitor 7 As appears from the ,previous description, particularly from the discussion of Fig. 2', the circuit means including, capacitor 8 and resistor 9 function as an ignition circuit in'wliich capacitor 8" constitutes the ignition capacitor,
  • the concept of the invention is not limited to using a capacitor as source of power or as storage for energy although the use of a capacitor is the preferred form of the invention.
  • An alternative power supply may be formed by an electrostatic generator which isdriven by a physical magnitude acting upon the projectile when in flight, such as the centrifugal force developed by the spinning of theprojectile.
  • Another meansv of: generating the. necessary energy during the flight of the projectile is a dynamo: r0- tated by the forces resulting from the spinning. of the projectile;
  • a self-arming and. self-ignitingfuse fon an explosive missile comprising fuse ignition. mean's;-.circuit means: co.- acting with said ignition means for igniting the same in response to an energization of said circuit means, energizingrneans connected with said circuit means for' supplying energy to the same,: said energizing means includingpower. capacitance means and a metal fuse casingincludingfia chamber, powdered insulation 1 material ⁇ in saidchamber, said casing having at leastone ductleading from. said chamber. to the outside of thecasing'at a'slant. rearwardly relative to-the directionofflight.ofthe' missile, a metallining. for.
  • saidduct electrically insulated from said casing, one electrode of said power capacitance means-being connected to said-lining, and the-.otherrto saidcasingwliereby the. powdered materialis ejected from sai'd'chamber when said missile is in flight. andathefriction between said material and said liningand the contact of'ej'ected material with said casing effect charging of said'ipowercapacitance means, the energizing means-being gradually'charged froman initial'substantially zero minimumcharge to a maximum charge by said. ejection of. the powdered material, said. maximum. charge energizing. said" circuit means for igniting. the ignition means, and. normally open switch means connected. in. a circuit.
  • said circuit means include:circuit'control'means activating saidcircuit means for'igniting said ignition means in response to said maximum-charge; saidswitch means being connect'edin shuntt'osa'idcontrol means for'short'circuiting the same by cl'osingof the switch means whereby the charge. required to" energize" said circuit' means is reduced to said intermediate value.
  • circuit control means comprise dischargetubemeans, said tube means becoming-conductive in' responseto said maximum charger 4l- A fuse according to claim 1', wherein the saidcircuit' means 'incliide:ignition'capacitance means; circuit'control meansan'dsaid ignition'means; said control meansr'being.
  • circuit means further include time-delay means delaying charging of said ignition capacitance means by said energizing means for a predetermined period of time.
  • a fuse according to claim 5, wherein the said time delay means comprise resistance means.
  • a self-arming and self-igniting fuse for an explosive missile spinning when in flight said fuse comprising electrically operable fuse ignition means, circuit means connected to said ignition means for operating the same upon energization of said circuit means, means for energizing said circuit means, said energizing means comprising a metal fuse casing including a chamber, powdered insulation material in said chamber, said casing having at least one duct leading from said chamber to the outside of the casing at a slant rearwardly relative to the direction of flight of the missile, a metal lining in said duct electrically insulated from said casing, and capacitance means having one electrode connected to said lining and the other to said casing whereby the powdered material is ejected from said chamber when the missile is in flight and the friction between the said material and said metal lining and the contact of the ejected material with the casing effect charging of said capacitance means, the charge of the capacitance means being fed to said circuit means to energize the same for igniting said ignition
  • a fuse according to claim 9 wherein a plug is inserted in the outer end of said duct for sealing the same, the said plug being fitted for ejection by the effect of the centrifugal force acting upon the fuse when the missile is in flight.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Elimination Of Static Electricity (AREA)
US463577A 1954-09-15 1954-10-20 Fuse for an explosive projectile Expired - Lifetime US2791963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US463577A US2791963A (en) 1954-09-15 1954-10-20 Fuse for an explosive projectile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB26810/54A GB751579A (en) 1954-09-15 1954-09-15 Electric fuze for artillery projectiles
US463577A US2791963A (en) 1954-09-15 1954-10-20 Fuse for an explosive projectile

Publications (1)

Publication Number Publication Date
US2791963A true US2791963A (en) 1957-05-14

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ID=10249594

Family Applications (1)

Application Number Title Priority Date Filing Date
US463577A Expired - Lifetime US2791963A (en) 1954-09-15 1954-10-20 Fuse for an explosive projectile

Country Status (7)

Country Link
US (1) US2791963A (enrdf_load_stackoverflow)
BE (1) BE532230A (enrdf_load_stackoverflow)
CH (1) CH330866A (enrdf_load_stackoverflow)
DE (1) DE1031687B (enrdf_load_stackoverflow)
FR (1) FR1109717A (enrdf_load_stackoverflow)
GB (1) GB751579A (enrdf_load_stackoverflow)
NL (1) NL95594C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000315A (en) * 1958-07-23 1961-09-19 Harry G Anastasia Safety and arming mechanism
US3034439A (en) * 1958-06-06 1962-05-15 Hazeltine Research Inc Apparatus for cooling a high-speed missile
US3054352A (en) * 1959-01-22 1962-09-18 Jr Rene Perdreaux Artillery fuze
US3088988A (en) * 1958-02-13 1963-05-07 Eltro Ges Fur Strahlungstechni Electrical power source for rockets
US3903805A (en) * 1959-02-25 1975-09-09 Avco Corp Impact fuze
US4417518A (en) * 1978-03-08 1983-11-29 Diehl Gmbh & Co. Detonating arrangement for missiles
FR2681681A1 (fr) * 1991-09-25 1993-03-26 Rheinmetall Gmbh Mine a detonateur chercheur.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL125215C (enrdf_load_stackoverflow) 1959-11-06
DE978027C (de) * 1961-10-21 1975-08-07 Telefunken Patentverwertungs Gmbh, 7900 Ulm Verfahren zur Vermeidung gegnerischer Störungen eines Annäherungs- oder Abstand szünde rs
NO140947C (no) * 1977-12-21 1979-12-12 Kongsberg Vapenfab As Kombinasjonstennroer for missiler.
ES8401247A1 (es) * 1982-06-18 1983-11-16 Talleres Biabi Mejoras introducidas en los sistemas de ignicion de bombas belicas.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE487039C (de) * 1927-01-14 1929-11-30 Rheinische Metallw & Maschf Elektrischer Doppelzuender
US1858969A (en) * 1926-06-26 1932-05-17 Rheinische Metallw & Maschf Electric fuse for projectiles

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE304255C (enrdf_load_stackoverflow) *
DE476379C (de) * 1926-06-26 1929-05-16 Rheinische Metallw & Maschf Elektrischer Zuender
DE486942C (de) * 1926-06-26 1929-11-28 Rheinische Metallw & Maschf Elektrischer Zuender
DE581491C (de) * 1931-04-11 1933-07-28 Rheinische Metallw & Maschf Elektrischer Zuender mit Mehrfachwirkung
DE553024C (de) * 1931-04-11 1932-06-22 Rheinische Metallw & Maschf Elektrischer Zuender mit Kondensatoren als Zuendstromtraeger
DE712083C (de) * 1936-03-29 1941-10-11 Deutsches Reich Vertreten Durc Messung oder Ausloeung von ballistischen Vorgaengen und Geschosswirkungen
FR865507A (fr) * 1939-05-09 1941-05-26 Centre Nat Rech Scient Fusée de projectile
CH217801A (de) * 1940-06-21 1941-11-15 Bofors Ab Einrichtung zur Erzeugung eines elektrischen Impulses mit veränderlicher Zeitverzörgerung, insbesondere zum elektrischen Tempieren von Geschossen.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1858969A (en) * 1926-06-26 1932-05-17 Rheinische Metallw & Maschf Electric fuse for projectiles
DE487039C (de) * 1927-01-14 1929-11-30 Rheinische Metallw & Maschf Elektrischer Doppelzuender

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3088988A (en) * 1958-02-13 1963-05-07 Eltro Ges Fur Strahlungstechni Electrical power source for rockets
US3034439A (en) * 1958-06-06 1962-05-15 Hazeltine Research Inc Apparatus for cooling a high-speed missile
US3000315A (en) * 1958-07-23 1961-09-19 Harry G Anastasia Safety and arming mechanism
US3054352A (en) * 1959-01-22 1962-09-18 Jr Rene Perdreaux Artillery fuze
US3903805A (en) * 1959-02-25 1975-09-09 Avco Corp Impact fuze
US4417518A (en) * 1978-03-08 1983-11-29 Diehl Gmbh & Co. Detonating arrangement for missiles
FR2681681A1 (fr) * 1991-09-25 1993-03-26 Rheinmetall Gmbh Mine a detonateur chercheur.

Also Published As

Publication number Publication date
GB751579A (en) 1956-06-27
FR1109717A (fr) 1956-02-01
NL95594C (enrdf_load_stackoverflow) 1960-10-15
CH330866A (de) 1958-06-30
BE532230A (enrdf_load_stackoverflow) 1958-01-31
DE1031687B (de) 1958-06-04

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