US3630152A - Safety fuse with time and impact action - Google Patents

Safety fuse with time and impact action Download PDF

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Publication number
US3630152A
US3630152A US36170A US3630152DA US3630152A US 3630152 A US3630152 A US 3630152A US 36170 A US36170 A US 36170A US 3630152D A US3630152D A US 3630152DA US 3630152 A US3630152 A US 3630152A
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US
United States
Prior art keywords
piston
fuse
main piston
casing
bore
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
US36170A
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English (en)
Inventor
Claes G Arnell
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.)
Foersvarets Fabriksverk
Original Assignee
Foersvarets Fabriksverk
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 Foersvarets Fabriksverk filed Critical Foersvarets Fabriksverk
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Publication of US3630152A publication Critical patent/US3630152A/en
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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
    • F42C15/18—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
    • F42C15/184—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 slidable carrier
    • 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
    • F42C15/24—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
    • 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
    • F42C9/10—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition the timing being caused by combustion
    • 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
    • F42C9/142—Double fuzes; Multiple fuzes combined time and percussion fuzes in which the timing is caused by combustion

Definitions

  • the fuse also contains a delay-composition-containing piston that is movable toward a fixed firing pin ⁇ 56] References Cited in a direction at an angle to the main piston.
  • the delay piston UNITED STATES PATENTS has stopping means preventing its movement as long as the 2,005,053 6/1935 Schlafer 102/72 main piston has not reached its outward, fully armed position.
  • the present invention relates to a fuse of this type that has a piston provided with a special safety ball lock where the piston prevents the time circuit from not releasing until the piston has had sufficient time to move to a position where the firing pin in the impact circuit can reach the percussion cap and the booster.
  • the fuse is especially suited for hand and smoke grenades and in particular grenades that can be attached to a rear driving part having stabilizing fins enabling the grenades to be launched by a small mortar.
  • FIG. 1 shows a main section parallel with the axis of the piston and FIG. 2 shows a sectional view taken perpendicular to said axis.
  • a fuse casing 1 having a transverse bore 20 in which a main piston 7, surrounded and sealed by double O-rings, is fitted.
  • the main piston 7 is preferably spring loaded by springs 30 and at one end is pierced by a hole containing a percussion cap.
  • the cap is shown at Ma and a booster 14b and the cap are fully displaced in relation to a detonator when the piston 7 is pushed into the bore 20.
  • the detonator is located in the center of a cover 11 that is sealed by an O-ring 21 and it covers a hole extending through the top wall of the casing.
  • a TNT charge 10 is located above the cover 11 and the booster. Attached in the cover is a fixed firing pin 12 (FIG.
  • the fuse casing I has, parallel to its axis, a hole containing another piston 13 (FIG. 2) that is spring loaded from below by spring 23 and is filled with a delay composition. This is a time circuit piston and it has a stopping flange 1311 that abuts against the jacket of the main piston 7 except when the piston 7 is in a fully drawn-out, armed position.
  • the main piston 7 has at its underside, a recess 6b for the purpose of catching the firing pin before the piston 7 has had enough time to move out to fully armed position.
  • the piston 7 also has in its externally projecting end, a hole for a transport-locking sprint 7a that prevents the piston from being pushed in unintentionally.
  • the main piston 7 can have at least one small leak hole [7 for air going radially into the guiding hole for the main piston spring 30. The diameter of this hole regulates the duration of time for the outward arming movement of the piston together with the driving spring pressure.
  • the end of the locking pin remote from the handle has a U- shaped recess 26 into which a movable firing pin 6 penetrates through a central guiding hole 27 in the bottom wall of the fuse casing.
  • the firing pin 6 has a head and is shaped like a thum btack and it abuts directly against a relatively large metal ball 5 located in a conical, funnel-shaped bore provided with a permanent magnet 3 in its bottom in an adjacent bottom socket 2 that is threaded into the lower part of the fuse casing l.
  • the socket 2 is externally threaded and can be equipped with either a protective cap or a short tube 4 or tail, with a driving charge and guiding fins underneath.
  • the fuse can be used in wing shells for a small portable mortar with a range of a couple of hundred yards.
  • the transport safety or spring 7a and the striker operation or locking pin 15 are both removed.
  • the user then manually pushes the main piston 7 inwardly and when he later launches the grenade the ball 5 will overcome the attraction of the magnet 9 by this movement and the ball 5 falls down from the mouth into the bottom of the bore 8b in the main piston that is now free to move outwardly.
  • This outward movement takes approximately from 1 to 1.5 seconds because of the strong suction or vacuum effect behind the piston 7 and the air will only leak in through the small hole 17.
  • the piston is halted in the armed position by means of a small peg l6 positioned in the bottom wall of the casing l and which pin strikes against one end of a recess or shallow groove or slot 16a formed in the lower part of the piston 7.
  • the flange 13a on the piston 13 that contains the delay composition is now able to pass through a corresponding recess or cutaway part in the jacket of the main piston 7 with the result that the piston 13 strikes against the fixed striker pin 12 in the cover 11.
  • the gages from the ignited delay composition will leak out through and along the groove or slot 16a because the O-ring at the right end of the piston will be outside the external wall of the fuse casing.
  • the striker safety the locking pin 15, can be allowed to stay in the fuse at launching.
  • the piston 13 can therefore be locked by any conventional lock.
  • the transport and striker function safety (7a and 15 respectively) are removed as herein described and the grenade is introduced into the mortar barrel after the driving tail part has been threaded on.
  • the gas pressure during launch will push the piston 7 inwardly with a force much greater than if one uses hand power and the ball 9a will be moved down into the bore 8b due to the linear acceleration.
  • the piston does not start to move-outwardly until the grenade has left the barrel but after that there is obtained an unusually long trajectory safety. That is tosay, the grenade travels a long distance from the gun muzzlebefore the fuse is fully armed.
  • a safety fuse having combined delay and impact-type action and preferably adapted for a hand or smoke grenade, said fuse containing a firing pin actuated by an impact-sensitive body located in an adjacent bottom socket attached to a fuse casing and comprising a conical funnellike surface, a permanent magnet, a percussion cap, a booster charge, a transversely movable main piston in the casing, the booster charge being located in the piston, the piston being spring loaded and fitted in a bore in the casing, the casing having a second bore, the latter bore containing a spring-loaded, delay-compositioncontaining piston, a fixed firing pin toward which the latter piston is movable, the main piston when in a safety position being prevented from moving outwardly, a locking body preventing such movement, said locking body partly resting in a hollow in the casing, a magnet mounted in a cover over the hole and holding the locking body in place, the main piston having a radial bore into which the locking body partly projects, said bore having a narrowed
  • the diameter of said leak hole determines the delay time of the arming movement.
  • a safety fuse according to claim 2 wherein the fuse casing has a hole on a level with an end of the firing pin for a sidewardly displaceable locking pin having a recess for the reception in safety position of the firing pin which has the lowest possible mass, said locking pin having a head abutting directly against the impact-sensitive body as long as the locking pin striker functions safety stays in.
  • a safety fuse according to claim 1 wherein a short tube with a hole, fins and driving charges can be attached to a bottom socket of the fuse and that the main piston is pushed inwardly by the pressure of the driving gases in the barrel of a mortar during launch.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Air Bags (AREA)
US36170A 1969-05-19 1970-05-11 Safety fuse with time and impact action Expired - Lifetime US3630152A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE07026/69A SE331438B (no) 1969-05-19 1969-05-19

Publications (1)

Publication Number Publication Date
US3630152A true US3630152A (en) 1971-12-28

Family

ID=20270215

Family Applications (1)

Application Number Title Priority Date Filing Date
US36170A Expired - Lifetime US3630152A (en) 1969-05-19 1970-05-11 Safety fuse with time and impact action

Country Status (12)

Country Link
US (1) US3630152A (no)
JP (1) JPS5022840B1 (no)
AT (1) AT299751B (no)
BE (1) BE749260A (no)
CH (1) CH516781A (no)
DE (1) DE2024380A1 (no)
FR (1) FR2047338A5 (no)
GB (1) GB1299407A (no)
IE (1) IE34166B1 (no)
NL (1) NL7006126A (no)
NO (1) NO125702B (no)
SE (1) SE331438B (no)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4762066A (en) * 1986-07-22 1988-08-09 Diehl Gmbh & Co. Fuze for a parachute-stabilized or band-stabilized small bomb which rotates during flight
US4811664A (en) * 1987-03-31 1989-03-14 The State Of Israel, Ministry Of Defence, Israel Military Industries Fuse for sub-munition warhead
US4873927A (en) * 1987-12-03 1989-10-17 Diehl Gmbh & Co. Pyrotechnic fuze for projectiles, rockets, bomblets and mines
US20090320709A1 (en) * 2006-06-16 2009-12-31 Tda Armements Sas Safety lighter for pyrotechnic device
CN115265297A (zh) * 2022-08-18 2022-11-01 南京理工大学 一种引信单磁性保险球运动可逆式保险机构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE367869B (no) * 1972-10-26 1974-06-10 Foerenade Fabriksverken
US4419934A (en) * 1980-08-28 1983-12-13 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Safety apparatus for a spinning projectile fuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2005053A (en) * 1932-07-13 1935-06-18 Rheinische Metallw & Maschf Fuse for projectiles and particularly for small caliber high explosive projectiles
US3078802A (en) * 1960-05-16 1963-02-26 Graviner Manufacturing Co Missile fuzes
US3313236A (en) * 1965-05-12 1967-04-11 Honeywell Inc Multiple function fuzes
US3371608A (en) * 1967-06-01 1968-03-05 Avco Corp Fuze with delay firing and impact firing features

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2005053A (en) * 1932-07-13 1935-06-18 Rheinische Metallw & Maschf Fuse for projectiles and particularly for small caliber high explosive projectiles
US3078802A (en) * 1960-05-16 1963-02-26 Graviner Manufacturing Co Missile fuzes
US3313236A (en) * 1965-05-12 1967-04-11 Honeywell Inc Multiple function fuzes
US3371608A (en) * 1967-06-01 1968-03-05 Avco Corp Fuze with delay firing and impact firing features

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4762066A (en) * 1986-07-22 1988-08-09 Diehl Gmbh & Co. Fuze for a parachute-stabilized or band-stabilized small bomb which rotates during flight
US4811664A (en) * 1987-03-31 1989-03-14 The State Of Israel, Ministry Of Defence, Israel Military Industries Fuse for sub-munition warhead
US4873927A (en) * 1987-12-03 1989-10-17 Diehl Gmbh & Co. Pyrotechnic fuze for projectiles, rockets, bomblets and mines
US20090320709A1 (en) * 2006-06-16 2009-12-31 Tda Armements Sas Safety lighter for pyrotechnic device
US8122829B2 (en) * 2006-06-16 2012-02-28 Tda Armements Sas Safety lighter for pyrotechnic device
CN115265297A (zh) * 2022-08-18 2022-11-01 南京理工大学 一种引信单磁性保险球运动可逆式保险机构
CN115265297B (zh) * 2022-08-18 2023-10-13 南京理工大学 一种引信单磁性保险球运动可逆式保险机构

Also Published As

Publication number Publication date
GB1299407A (en) 1972-12-13
JPS5022840B1 (no) 1975-08-02
FR2047338A5 (no) 1971-03-12
NO125702B (no) 1972-10-16
SE331438B (no) 1970-12-21
AT299751B (de) 1972-06-26
DE2024380A1 (de) 1970-11-26
IE34166B1 (en) 1975-02-19
BE749260A (fr) 1970-10-01
NL7006126A (no) 1970-11-23
IE34166L (en) 1970-11-19
CH516781A (fr) 1971-12-15

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