US2044219A - Firing mechanism for automatic firearms - Google Patents

Firing mechanism for automatic firearms Download PDF

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Publication number
US2044219A
US2044219A US754101A US75410134A US2044219A US 2044219 A US2044219 A US 2044219A US 754101 A US754101 A US 754101A US 75410134 A US75410134 A US 75410134A US 2044219 A US2044219 A US 2044219A
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trigger
sear
pawl
spring
automatic firearms
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US754101A
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Lauf Hans
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    • 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
    • F41A19/25—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins
    • F41A19/27—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block
    • F41A19/29—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension
    • F41A19/30—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having only slidably-mounted striker elements, i.e. percussion or firing pins the percussion or firing pin being movable relative to the breech-block propelled by a spring under tension in bolt-action guns
    • F41A19/33—Arrangements for the selection of automatic or semi-automatic fire

Definitions

  • the present invention relates to a firing mechanism intended for automatic firearms, by means of which it is possible without special reversing operation to fire at will single shots or a series of shots.
  • the trigger is formed as a two-armed rocking lever, which when pulled by one lever arm acts for the discharging of single shots and when pulled by the other lever arm acts for the discharging of shots in series.
  • This embodiment admits of a simple solution of the problem of passing from one kind of firing to another without setting or reversing any special reversing members.
  • the invention is illustrated on the accompanying drawing, which shows a vertical section through the trigger mechanism and adjacent parts of a gas driven automatic firearm, the breech block of which is denoted by reference I and the breech body by reference 2.
  • the trigger it! is provided with two arms 20 and 2
  • the trigger I8 In its position at rest the trigger I8 is suspended on both spindles 22 and 23 when a projection on the trigger engages immediately below the shoulder 26 of the trigger bar or sear 25.
  • This trigger bar or sear is adapted to turn about the fulcrum pin 21 which is mounted in v the pistol grip 36 secured beneath the breech body 2.
  • the trigger 18 turns about its front spindle 22 and lifts the trigger bar or sear 25 so that its rear end 29 swings downwardly and becomes disengaged from the front surface of the locking projection 3 of the breech block.
  • the latter is then thrown forward by the closing spring II.
  • the trigger l8 and the front end of the trigger bar or sear 25 remain in engagement, and the rear trigger bar end 29 is kept out of the way of the reciprocating breech block I, as long as the trigger I8 is actuated.
  • the gun is being discharged in series.
  • the trigger I8 turns about the rear spindle 23.
  • the pawl 32 which is mounted on a pin 30 secured in the trigger and adapted to turn about the pivot pin 33 in the recess 3i of the trigger 18, then lifts the bevelled front end I! of the trigger bar or sear 25, which extends into the said recess.
  • the shoulder 33 of the pawl 32 strikes against the lower surface of the front spindle 22 and swings the upper end of the pawl forward, so that it glides off the end I! of the trigger bar or sear 25 so that the latter may again get in the way of the breech block, which has been thrown forward, thus firing a single shot.
  • a leaf spring 34 is secured in the pistol grip 36 by means of the pin 35 and serves as pawl and sear actuating spring.
  • the rear end of said spring hooks over a toe on the trigger bar or sear 25 and permanently tends to draw said toe downwards and swing end 29 of the sear upwards.
  • the free end of the said spring 34 engages a rear projection of the pawl 32, so that it always tends to move the upper end of the pawl rearward, consequently into a position below the front end I! of the trigger bar 25.
  • the point of contact of the pawl is chosen in such a manner that by means of the pin 30 of the trigger IS the pawl always is again returned to its neutral position by spring 34.
  • a trigger mechanism in which said means comprises a pawl normally engaging said front end of the sear, a rear lug on the pawl engaging said spring and a front lug on the pawl normally free but adapted to contact with said front spindle to release said sear when the trigger is actuated through said upper trigger arm.
  • a trigger mechanism in which said means comprises a pawl normally engaging said front end of the sear, a rear lug on the pawl engaging said spring and a front lug on the pawl normally free but adapted to contact with said front spindle to release said 10 sear when the trigger is actuated through said upper trigger arm, said spring being secured substantially at its middle portion in said breech body, a forward leg engaging said rear lug on the pawl in order to normally engage the pawl with the front end of the sear, and a rear extension of said spring engaging a toe formed on the sear forwardly of the fulcrum point so as to raise the rear end of the sear into engagement with the breech block.

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  • General Engineering & Computer Science (AREA)
  • Toys (AREA)

Description

June 16, 1936.
H. LAUF FIRING MECHANISM FOR AUTOMATIC FIREARMS Filed Nov. 21, 1954 Patented June 16 1936 UNITED STATES FIRING MECHANISM FOR AUTOMATIC FIREARMS Hans Lauf, Stockholm, Sweden Application November 21, 1934, Serial No. 754,101 In Sweden November 22, 1933 3 Claims.
The present invention relates to a firing mechanism intended for automatic firearms, by means of which it is possible without special reversing operation to fire at will single shots or a series of shots.
According to the invention the trigger is formed as a two-armed rocking lever, which when pulled by one lever arm acts for the discharging of single shots and when pulled by the other lever arm acts for the discharging of shots in series. This embodiment admits of a simple solution of the problem of passing from one kind of firing to another without setting or reversing any special reversing members.
The invention is illustrated on the accompanying drawing, which shows a vertical section through the trigger mechanism and adjacent parts of a gas driven automatic firearm, the breech block of which is denoted by reference I and the breech body by reference 2.
The trigger it! is provided with two arms 20 and 2| and adapted to turn about either one of the two spindles 22 and 23 according to whether its upper arm 20 or its lower arm 2| is pulled, the oblong slots 24 and 24a extending below the spindles 22 and 23 respectively admitting of free movement. In its position at rest the trigger I8 is suspended on both spindles 22 and 23 when a projection on the trigger engages immediately below the shoulder 26 of the trigger bar or sear 25. This trigger bar or sear is adapted to turn about the fulcrum pin 21 which is mounted in v the pistol grip 36 secured beneath the breech body 2. If the lower arm 2| is pulled back, the trigger 18 turns about its front spindle 22 and lifts the trigger bar or sear 25 so that its rear end 29 swings downwardly and becomes disengaged from the front surface of the locking projection 3 of the breech block. The latter is then thrown forward by the closing spring II. The trigger l8 and the front end of the trigger bar or sear 25 remain in engagement, and the rear trigger bar end 29 is kept out of the way of the reciprocating breech block I, as long as the trigger I8 is actuated. Thus the gun is being discharged in series.
If, however, the upper trigger arm 20 is pulled back the trigger I8 turns about the rear spindle 23. The pawl 32, which is mounted on a pin 30 secured in the trigger and adapted to turn about the pivot pin 33 in the recess 3i of the trigger 18, then lifts the bevelled front end I! of the trigger bar or sear 25, which extends into the said recess. When the rear portion 29 of the trigger bar or sear has liberated the breech block I, so that the latter is thrown forward by spring II, the shoulder 33 of the pawl 32 strikes against the lower surface of the front spindle 22 and swings the upper end of the pawl forward, so that it glides off the end I! of the trigger bar or sear 25 so that the latter may again get in the way of the breech block, which has been thrown forward, thus firing a single shot.
A leaf spring 34 is secured in the pistol grip 36 by means of the pin 35 and serves as pawl and sear actuating spring. The rear end of said spring hooks over a toe on the trigger bar or sear 25 and permanently tends to draw said toe downwards and swing end 29 of the sear upwards. The free end of the said spring 34 engages a rear projection of the pawl 32, so that it always tends to move the upper end of the pawl rearward, consequently into a position below the front end I! of the trigger bar 25. The point of contact of the pawl is chosen in such a manner that by means of the pin 30 of the trigger IS the pawl always is again returned to its neutral position by spring 34.
Having now described my invention, what I claim as new and desire to secure by Letters Patent is:
1. A double acting self-adjusting trigger mech anism for automatic firearms for discharging single shots and shots in series respectively, in combination with a breech body having a breech block reciprocal therein; said mechanism comprising a trigger having two arms, two spindles secured in the breech body acting as pivots respectively for said trigger arms, one spindle located behind the other in such a manner that when the upper arm is pulled the trigger turns about the rear spindle for single firing and when the lower arm is pulled the trigger turns about the front spindle for series firing, a double ended sear mounted for oscillation in said breech body, one of the sear ends being adapted for engaging said breech block to retain it in retracted position, a flat spring tending to swing the sear into such engagement, means mounted on the trigger actuated by said spring for engagement with the other of said sear ends, and said means tending to release such engagement with the other sear end when encountering said front spindle while the trigger is being pulled.
2. A trigger mechanism according to claim 1, in which said means comprises a pawl normally engaging said front end of the sear, a rear lug on the pawl engaging said spring and a front lug on the pawl normally free but adapted to contact with said front spindle to release said sear when the trigger is actuated through said upper trigger arm.
3. A trigger mechanism according to claim 1, in which said means comprises a pawl normally engaging said front end of the sear, a rear lug on the pawl engaging said spring and a front lug on the pawl normally free but adapted to contact with said front spindle to release said 10 sear when the trigger is actuated through said upper trigger arm, said spring being secured substantially at its middle portion in said breech body, a forward leg engaging said rear lug on the pawl in order to normally engage the pawl with the front end of the sear, and a rear extension of said spring engaging a toe formed on the sear forwardly of the fulcrum point so as to raise the rear end of the sear into engagement with the breech block.
' HANS LAUF.
US754101A 1933-11-22 1934-11-21 Firing mechanism for automatic firearms Expired - Lifetime US2044219A (en)

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SE2044219X 1933-11-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290993A (en) * 1964-06-23 1966-12-13 Star Bonifacio Echeverria S A Release mechanism for automatic firearms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290993A (en) * 1964-06-23 1966-12-13 Star Bonifacio Echeverria S A Release mechanism for automatic firearms

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