US3029708A - Trigger mechanism for automatic firearms - Google Patents

Trigger mechanism for automatic firearms Download PDF

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Publication number
US3029708A
US3029708A US89539A US8953961A US3029708A US 3029708 A US3029708 A US 3029708A US 89539 A US89539 A US 89539A US 8953961 A US8953961 A US 8953961A US 3029708 A US3029708 A US 3029708A
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United States
Prior art keywords
hammer
arm
tooth
mass
trigger
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
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US89539A
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English (en)
Inventor
Marchisio Felice
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Individual
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Individual
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/03—Shot-velocity control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/42—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/43—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • F41A19/44—Sear arrangements therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
    • F41A19/42—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
    • F41A19/43—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
    • F41A19/46—Arrangements for the selection of automatic or semi-automatic fire

Definitions

  • This'invention relates to automatic firearms Suitable for selective action of Asingle orcontinuous fire,of the type provided with a trigger mechanism according to application namelyd ⁇ in the U.S.A. Von the July'27, 1960 Ser. No. 45,7ll.-"
  • This trigger mechanism comprises namely a reciprocating breech bolt, a casing arranged'beneath the breech bolt path,a -first and a second pivot Ain said casing, a hammer capable of swinging-about said first mentioned pivot betweena recoil and a ring position over ⁇ a' path intersecting the breech bolt path, so that recoil of the breech Abolt drives Y'the Y hammer i to its recoilk position,"spring-loaded means forming together with the hammer a ltoggle link which moves the hammer to its first and second mentioned positions across a ⁇ deadmpoint position, a spring loaded delay umass adjacent the hammer on said first mentioned pivot capable of swinging about the latterl between a recoil and a :firing position 'over -a'patli intersectinglthe breech bolt path, so that recoil of the breech bolt drives the delay mass ⁇ to its recoil position; vspring
  • ⁇ FIGURE l showsthe mechanism at the limit of the recoil phase of the hammer
  • FIGURE shows the mechanism cocked, set for single shot action
  • a Sear capable of swinging on said second mentionedfpivot from a safety to a continuous firing position'through a 4single tiring position and vice Versa, a tooth protruding ⁇ from thc'sear, a tooth radiallyprotruding from the harrnner, a two-arm beam, the arms of which-extend between the paths ⁇ ofthe said two teeth, said beam being provided with -an eyelet extending in the direction of theY ar-.ms cooperating with the second mentionedpivot, whereby the beam is moved by the tooth on the hammer acting on one of its arms to'intersectby its other arm the path of the tooth on the scar, While holdingk the hammer inl its cocked condition, and spring means acting onthe beam to displace the latter in the direction of said rst mentioned arm tocause said first mentioned arm to intersect the path of the tooth on the hammer, said tooth on the scar acting on the beam to move the latter about
  • ⁇ A triggermechanism as described above shall be briefly referred to hereafter and in the appended claims as mechanism of the type specified.
  • This mechanism afords-a substantially reduced continuous re rate, whereby thetcrm rate ⁇ is employedto designate the number of shots which the arm is capable of tiring in aminute under antomatictcontinuous) tiring conditions; -At reduced ,continuous tiring rate ⁇ can, however, be undesirable or disadvantageous under special emergency conditions.
  • This invention provides a fire arm provided with a trigger mechanism vof the type specified whichaffords in continuonsziire; tworates ofiire atleast, one of which is substantially slower.
  • Theinventionf therefore provides a trigger mechanism of the type specified comprisingrnoreover manually controlled means acting between the hammerl and delay mass
  • Thelother side plate 1i supports three iixed pivotsiZ, i4 and i6 thatf extend toward-thefother side-plate.
  • hammer i7 and vdelay mass 18, both having a form of a two-'arm lever.
  • the arm 17a of the'hammer i7 andthe arm 18a of -the delay lmass u18 are provided intermediately their llength with la through hole "itil and i632, respectively, bothholes having-axes parallel'to and eqnidistant from the-axis of the pivot 12.
  • the arm 17a-of the hammer and thearin 'lafof the delay mass normally interfere with the' recoil path of the breech bolt Ztl, the said breech bolt contains a ring pin, its rearV part 2i protriidingfrom the rear of fthe breech bolt. l
  • the arm Ha of hammer i7 moves-fin this same planeas theiiringpin and by striking the extremity 2li of the latter cause action.
  • the arm 18a of fthedelay mass has a semicylindrical seat-'22 housing the'head 23a of a push rod 23.
  • the *other lever arm of hammer 17 carries a lateral iinger17bv protruding into” the path of the delay mass 18.
  • the delay mass 18 .engages the lateral nger 17b by either an abutment siirface 30y situated at the root of arm 13a or by another abutment surface 31 on the face of a tooth "18b which forms the vother lever yarm of the mass 18.
  • the angular distance between finger 17b and abutment surface 30 relatively to pivot 12 is such, that towards the end of forward (counterclockwise) movement of delay mass 18 towards situation shown on FIG.
  • the sur-face 30 meets finger 17b and takes it across the dead centre, thus permitting the spring 28 to swing the hammer towards the extremity 21 of tiring pin.
  • the abutment surface 31 of a tooth leb immediately adjacent to nger 17b as shown in FIG. 1, constitutes 'a stop for hammer 17 impeding any counterclockwise movement.
  • the trigger and sear 41 are pivoted on pivot 16. Wound around this pin is a spring 42, with one end bearing against pivot 12, the other end bearing against Itrigger 40, tending to keep the trigger in a neutral position, as shown on FIGS. 1 and 2, where the trigger bears against -a limit stop 43, xed to casing 10.
  • the rear part of the trigger 40 forms an arm 44, cooperating with a selector 45.
  • the selector is lformed by a pin able to rotate in supports in side plates of casing 10, and has a diametral incut 46.
  • the selector is controlled by a wing (not shown) on the out-side of casing and can be placed in three positions corresponding to: safety, semiautomatic or single shot firing and full automatic or continuous tiring.
  • FIGS. 1, 2 and 4 These positions are depicted in FIGS. 1, 2 and 4, respectively.
  • the sear 41, T Kformed, is suspended on pin 16 passing through an eyelet 47 parallel to the top bar of T; this suspension permits oscillating and sliding motions of the sear.
  • the forearm 41a of sear 41 cooperates with a tooth 17C provided on hammer 17 ⁇ for locking it in the cocked position, i.e. immediately after the hammer passed the dead centre checked by the surface 30 and finger 17b, as shown in FIG. 2.
  • the body of trigger 40 houses a plunger 50 (FIG. 2) pushed against the vertical bar of the T sear under action of a compression spring, thus the sear 41 tends to slide forwards on the pin 16 and rotate suiciently to bring its front arm 41a into the path of the hammer tooth 17e.
  • the plunger spring is weaker than the hammer spring 28, thus as shown in FIG. 2, the scar 41 is pushed backwards by the hammer tooth 17e.
  • the rear arm 41b of sear 41 finds itself directly above a trigger tooth 51, and therefore the arm 41b is being raised-up when the trigger is pulled.
  • the arm 41h does not engage with the trigger tooth 51 (FIG. l), under certain conditions, however, described later, the sear arm 41b can be en-gaged by a step 52 (FIGS. 3 and 4) adjacent to tooth 51.
  • FIG. 1 shows the selector in safety position, where the trigger larm 44 bears against the cylindrical part of the selector, thus locking the trigger.
  • FIG. 2 shows a limited course is given to the arm 44 which penetrates into selector cut 46.
  • tooth 51 encounters the rear arm 41h of sear 41, and makes the said sear rotate on its pivot 16, until the hammer tooth 17C is set free land spring 28 through rod 27 swings the hammer anticlockwise against the rear extremity of firing pin 21 ⁇ located in the breech bolt 20, causing a shot to be red.
  • This invention provides means for temporarily rendering ineffective said lost motion connection.
  • said means comprises a pin received by said holes 101 and 102 bored both in the hammer f17 and delay mass 18, the said holes being aligned along a common axis.
  • the holes move on swinging on both hammer and delay mass about the pivot 12 over a slot 110 cut both through the side wall, ⁇ removed on the drawing, of the casing 2t) and wall 111 which laterally confines the body of the fire arm;
  • the slot profile is an arc of a circle having its center on the axis of the pivot 12.
  • the pin 10) can therefore be inserted into said holes from the outside through said slot from which it protrudes over a suitable length.
  • Insertion of the pin 100 into said holes connects in rotation the hammer and delay mass, thereby annulling the delay with which the hammer moves from its recoil position to its tiring position, said delay being otherwise determined by the time taken by the delay mass for moving from its recoil position to its firing position.
  • Adoption of the pin 169- for rendering ineffective the labove mentioned lost motion connection further affords an increment in hammering action by the hammer 17 on the striker carried by the breech bolt 20, this increment being due to the resultant action of both springs 25 and 28 which then act simultaneously to move said hammer and delay mass from recoil to firing condition.
  • a reciprocating breech bolt including a firing pin therein, a casing positioned below the path of the breech bolt, a first and ra second pivot in the casing, a hammer swinga'ble on the first pivot between a recoil condition and striking condition on a path intersecting the path of the breech bolt whereby the recoil stroke ofthe breech bolt displaces the hammer towards recoil condition of the latter
  • spring-loaded lock means-locking the mass in its rec

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Percussive Tools And Related Accessories (AREA)
US89539A 1959-08-05 1961-02-15 Trigger mechanism for automatic firearms Expired - Lifetime US3029708A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1316959 1959-08-05
IT3029708X 1960-02-22

Publications (1)

Publication Number Publication Date
US3029708A true US3029708A (en) 1962-04-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
US89539A Expired - Lifetime US3029708A (en) 1959-08-05 1961-02-15 Trigger mechanism for automatic firearms

Country Status (5)

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US (1) US3029708A (da)
CH (1) CH371364A (da)
FR (2) FR1263722A (da)
GB (1) GB879089A (da)
LU (1) LU39048A1 (da)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3577827A (en) * 1969-01-27 1971-05-04 Olin Mathieson Trigger mechanism
US4023465A (en) * 1975-06-27 1977-05-17 Inskip Thomas C Firearm
US4151670A (en) * 1976-05-12 1979-05-01 Rath Hans M Firing mechanism for semi-automatic firearms
EP0203034A2 (fr) * 1985-03-22 1986-11-26 FABBRICA D'ARMI P.BERETTA S.p.A. Dispositif de contrôle du tir par rafales pour armes automatiques
US5339721A (en) * 1992-01-14 1994-08-23 Fabrica D'armi P. Beretta S.P.A. Tripping mechanism for semiautomatic and automatic firearms
US5913261A (en) * 1996-06-28 1999-06-15 Heckler & Koch Gmbh Trigger arrangement
US10222161B2 (en) * 2016-05-06 2019-03-05 In Ovation Llc Trigger Assembly
US10267585B2 (en) * 2016-01-28 2019-04-23 Fostech, Inc. Trigger having a movable sear and firearms incorporating same
US10753698B2 (en) * 2017-05-12 2020-08-25 E3 Arms, Llc Trigger system with safety
US11054204B2 (en) 2019-10-04 2021-07-06 Smith & Wesson Inc. Trigger return spring mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5770814A (en) * 1996-05-09 1998-06-23 Defense Technologies Limited Firing rate regulating mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3577827A (en) * 1969-01-27 1971-05-04 Olin Mathieson Trigger mechanism
US4023465A (en) * 1975-06-27 1977-05-17 Inskip Thomas C Firearm
US4151670A (en) * 1976-05-12 1979-05-01 Rath Hans M Firing mechanism for semi-automatic firearms
EP0203034A2 (fr) * 1985-03-22 1986-11-26 FABBRICA D'ARMI P.BERETTA S.p.A. Dispositif de contrôle du tir par rafales pour armes automatiques
EP0203034A3 (en) * 1985-03-22 1987-08-26 Fabbrica D'armi P.Beretta S.P.A. Shot-number limiters for automatic firearms
US5339721A (en) * 1992-01-14 1994-08-23 Fabrica D'armi P. Beretta S.P.A. Tripping mechanism for semiautomatic and automatic firearms
US5913261A (en) * 1996-06-28 1999-06-15 Heckler & Koch Gmbh Trigger arrangement
US10267585B2 (en) * 2016-01-28 2019-04-23 Fostech, Inc. Trigger having a movable sear and firearms incorporating same
US10222161B2 (en) * 2016-05-06 2019-03-05 In Ovation Llc Trigger Assembly
US10753698B2 (en) * 2017-05-12 2020-08-25 E3 Arms, Llc Trigger system with safety
US11054204B2 (en) 2019-10-04 2021-07-06 Smith & Wesson Inc. Trigger return spring mechanism

Also Published As

Publication number Publication date
FR1280477A (fr) 1961-12-29
FR1263722A (fr) 1961-06-09
GB879089A (en) 1961-10-04
CH371364A (it) 1963-08-15
LU39048A1 (da) 1960-10-04

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