US2058822A - Automatic igniter for grenades - Google Patents

Automatic igniter for grenades Download PDF

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Publication number
US2058822A
US2058822A US3539A US353935A US2058822A US 2058822 A US2058822 A US 2058822A US 3539 A US3539 A US 3539A US 353935 A US353935 A US 353935A US 2058822 A US2058822 A US 2058822A
Authority
US
United States
Prior art keywords
tube
igniter
fuse
grenades
striker
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
US3539A
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English (en)
Inventor
Petter Charles Gabriel
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.)
ALSACIENNE D EXPLOSIFS SARL A
ALSACIENNE D'EXPLOSIFS (SOCIETE A RESPONSABILITE LIMITEE) A RICHWILLER Ste
Original Assignee
ALSACIENNE D EXPLOSIFS SARL A
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 ALSACIENNE D EXPLOSIFS SARL A filed Critical ALSACIENNE D EXPLOSIFS SARL A
Application granted granted Critical
Publication of US2058822A publication Critical patent/US2058822A/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
    • F42C14/00—Mechanical fuzes characterised by the ammunition class or type
    • F42C14/02—Mechanical fuzes characterised by the ammunition class or type for hand grenades

Definitions

  • This invention relates to an automatic igniter for grenades, of the known type in which the match or safety fuse, which produces the explosion of'a fulminate detonator, is ignited by the shock on a primer, of a striker released when a releasing lever is acted upon.
  • Igniters of this type comprise two distinct parts:
  • a cap which is screwed in a screw-threaded hole of the grenade and supports the percussion mechanism and the releasing lever.
  • the simple or double primer igniting the safety fuse is either arranged in a recess of the cap at the inlet of the safety fuse, or carried by a movable body of the percussion mechanism which is located outside the tube.
  • the striker is arranged in the recess receiving the primers and released by pulling off a locking member passing, with slight friction, through a thick metal wall obturating the said recess.
  • the primer is secured to a movable percussion pellet guided in the head of the igniter and which, when it is released by the releasing lever, strikes upon ⁇ a fixed needle or striker protecting the end of the safety fuse, but perforated in order that the primer can ignite the safety 36 fuse.
  • the detonator is o connected to the safety fuse by a beaded part 55 iences.
  • Fig. 1 is a general elevation, with partial axial section, of an igniter according to the invention.
  • Fig. 2 is a partial cross section made according to line A-A of Fig. l.
  • Fig. 3 is an underside plan View, on an enlarged scale, of the striker shown separately.
  • Fig. 4 is a partial elevation corresponding to Fig. 3.
  • igniter comprises a head or cap l, provided with a screw-threaded tubular part 2, and with a flange 3. In the screw-threaded tubular part 2 is secured the entire pyrotechnical part of the igniter.
  • a metal tube 4 pressed out in one piece with its bottom 5 and which exactly fits, at its upper portion, into the bore of a securing ring 6.
  • the latter is provided, at its upper part, with an annular seat 'l for the flanged edge 8 of the tube 4 held, after charging and placing in position, by a disc 9 made of a malleable metal such as tin for instance, clamped between a seat l0 of the head and the upper part of the ring 6 firmly secured by beading of a lower edge Il forming an extension of the screw-threaded part 2.
  • waxed joints are provided at I2 and I3.
  • the contents of the tube 4 are absolutely protected, in a durable manner, against any contact with the atmosphere, against inltrations of water or other liquids, and against the impregnation of the priming powder of the safety fuse by the fatty material encasing some explosives.
  • central tube 4 receives a unit constituted by a burning tube I4 containing the burning composition I5 held at both its ends by two conical plugs I6 formed of a paste of priming powder.
  • the burning tube I4 On a certain portion of its length, the burning tube I4 has its wall reduced in thickness in order that said tube I4 may fit into another tube I'I closed at its lower part I8 and containing, from bottom to top, a charge of picric acid I9 and a fulminate cap 20, the whole constituting the detonator held between the bottom 5 of the central tube and the lower end of the burning tube I4 by washers 2
  • the washer 22 is centrally perforated, as well as the bottom of the cap 20, for obtaining the explosion of the detonators through the combustion of the safety fuse I5.
  • the burning tube I4 receives, at its upper end, ⁇
  • the percussion and releasing mechanism which, according to an important feature of the invention is entirely located externally to the pyrotechnical part of the igniter, comprises a mushroom-shaped striker guided by its rod 26 in an axial conduit 2l of the head I and constantly vsubjected to the thrust of a spring 28 tensioned between the flange 29 and the bottom of the cylindrical recess 30 provided in the head I.
  • the circular flange 29 of the striker has a diameter corresponding to that of the recess 30 and largely cut away preferably at two diametrally opposed places 3
  • an axial projection 32 having a central point 33 recessed at its root portion at 34 for allowing it to positively perforate the primer 24 Without the beaded frame 25 of the latter forming a retaining abutment on the edge of the projection'32.
  • the striker is locked, when the spring 28 is compressed to the maximum extent, by the releasing lever 35.
  • the latter is made of pressed sheet metal and its upper part has two cheek members 36 bent down and stayed by a small metal plate 31 (Fig. 2) secured by electric welding at a few points, or otherwise.
  • a pin 38 is transversely secured to the upper part of the lever and its ends, outwardly projecting relatively to the latter, ⁇ rest in two grooves 39 provided in two fork members 4i] arranged on either side of a diametral slot 4I of the head I.
  • the conduit 21 opens on the upper face of the head I, so that the end of the rod 26 is always visible. When it comes level with the face 46, the percussion mechanism is in working order and ready to be released. This feature, which is advantageous in that it allows a control at a glance, is peculiar to the present invention.
  • the operation of the igniter is as follows:
  • the grenade is primed, in the known manner by screwing the screw-threaded part 2 in the corresponding screw-threaded hole of the grenade body.
  • the grenadier For ensuring the percussion of the grenade before throwing it, the grenadier holds tightly in his hand the grenade body 43 and the free end of the lever 35. He removes the pin 44 and throws the grenade. As soon as the lever 35 is released, the thrust of the spring 38 actuates the striker which ejects the lever 35 and the point 33 passes through the disc 9 and the primer 24. According to the invention, the combustion gases of the safety fuse easily find an issue to the exterior through the grooves 3I of the flange and th-e slot 4I of the head I.
  • the invention is not limited to the form of construction herein described and illustrated. It includes in its scope all means or combination of means suitable for carrying out the features set forth and in order to obtain the effects or results indicated.
  • An igniter for grenades including a casing for a firing mechanism having its lower end open and internally enlarged to provide a downwardly facing shoulder between the enlarged portion and the portion thereabove, a perforable closure disc resting against said shoulder, a securing ring mounted in said lower end and bearing against the peripheral portion of the disc, a tubular fuse casing fitting in said ring and having its upper end flanged outwardly to rest on the ring, a bead on the lower end of said first casing engaging the lower end of the ring to hold the latter in place, a.
  • fuse tube fitted in the fuse casing in spaced relation to said disc, a fuse composition in said tube, a percussion cap resting on the upper end of the fuse tube and covered by said disc, and a detonator at the lower end of said fuse tube and within the fuse casing.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Golf Clubs (AREA)
US3539A 1934-02-06 1935-01-26 Automatic igniter for grenades Expired - Lifetime US2058822A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR781413T 1934-02-06

Publications (1)

Publication Number Publication Date
US2058822A true US2058822A (en) 1936-10-27

Family

ID=9208180

Family Applications (1)

Application Number Title Priority Date Filing Date
US3539A Expired - Lifetime US2058822A (en) 1934-02-06 1935-01-26 Automatic igniter for grenades

Country Status (5)

Country Link
US (1) US2058822A (enMihai)
BE (1) BE407284A (enMihai)
CH (1) CH182099A (enMihai)
FR (1) FR781413A (enMihai)
GB (1) GB442970A (enMihai)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643946A (en) * 1945-03-07 1953-06-30 Us Sec War First fire charge composition
US2748705A (en) * 1952-10-28 1956-06-05 Frank B Hale Inertia and point detonation impact fuze
US2780428A (en) * 1954-11-23 1957-02-05 Switlik Parachute Co Inc Parachute container
US2857847A (en) * 1954-10-13 1958-10-28 Olin Mathieson Detonators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2643946A (en) * 1945-03-07 1953-06-30 Us Sec War First fire charge composition
US2748705A (en) * 1952-10-28 1956-06-05 Frank B Hale Inertia and point detonation impact fuze
US2857847A (en) * 1954-10-13 1958-10-28 Olin Mathieson Detonators
US2780428A (en) * 1954-11-23 1957-02-05 Switlik Parachute Co Inc Parachute container

Also Published As

Publication number Publication date
BE407284A (enMihai)
GB442970A (en) 1936-02-19
CH182099A (fr) 1936-01-31
FR781413A (fr) 1935-05-15

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