US3446114A - Trigger mechanism for automatic firearms - Google Patents

Trigger mechanism for automatic firearms Download PDF

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Publication number
US3446114A
US3446114A US691288A US3446114DA US3446114A US 3446114 A US3446114 A US 3446114A US 691288 A US691288 A US 691288A US 3446114D A US3446114D A US 3446114DA US 3446114 A US3446114 A US 3446114A
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US
United States
Prior art keywords
trigger
lever
hammer
breech block
backing plate
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
US691288A
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English (en)
Inventor
Wilhelm Ketterer
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.)
Heckler und Koch GmbH
Original Assignee
Heckler und Koch GmbH
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 Heckler und Koch GmbH filed Critical Heckler und Koch GmbH
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Publication of US3446114A publication Critical patent/US3446114A/en
Anticipated expiration legal-status Critical
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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
    • F41A19/42—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 a trigger mechanism for automatic firearms having a changeover device to change both from semi-automatic to full-automatic firing and simultaneously, from firing from closed bolt position to firing from open bolt position, said mechanism being disposed in a trigger box and comprising a catch lever which in its normal position, with the weapon set for automatic firing, projects into the path of movement of the breech block, catching and holding the later in its rearmost position, the trigger of said mechanism being provided with a driving member for displacing said each lever from its normal position.
  • a trigger mechanism of this type for a weapon of the pin firing type in which two side rollers are provided on the trigger and engaged by an arm of the catch lever under the action of a spring, provided the catch lever has been released by the safety roll when setting the weapon for automatic firing.
  • the arrangement is such that when the trigger is pulled, the end of the trigger projecting into the path of movement of the breech block is displaced from said path of movement whereas when the trigger is released, the catch lever follows the trigger and reenters the path of movement of the breech block and then catches the latter to terminate a burst.
  • the invention has as its object to avoid these disadvantages of the known arrangement and to provide a trigger mechanism ensuring that the catch lever comes into full engagement with the breech block so that unintentional advance of the breech block is safely eliminated.
  • This problem is solved according to the invention by mounting on the same pivot with the trigger a backing plate adapted to be rotated relative to the trigger through a smaller angle than the angle of rotation of the trigger, preloading the backing plate in the direction of trigger motion and providing the same with two sectors of different radii separated by a steep flank, and providing the catch lever at its end located in the trigger box with a hook-shaped lug engaging the larger-radius sector of the backing plate with the trigger pulled, until it comes within reach of the smaller-radius sector of the backing plate carried along by the trigger when the latter is released and drops abruptly onto said last-mentioned sector.
  • the catch lever does not follow the trigger movement when the trigger is released, but is maintained by the backing plate in the position in which its end is outside of the path of movement of the breech block, until the driving member for displacing the catch lever provided on the trigger has been displaced clear of the catch lever sufiiciently for the catch lever to return to its normal position without being prevented therefrom by said driving member. Only then is the catch lever released by the backing plate so that, under the action of its loading spring, it can be returned abruptly to its normal position.
  • the spring and the mass have been selected so that the speed at which the catch lever moves to its normal position is high compared to that of the breech block, whereby it is ensured that the catch lever reaches its normal position under any circumstances and comes ino full engagement with the breech block when the latter is caught. In this manner, the aforementioned danger is completely eliminated.
  • the driving member provided on the same comes into engagement with the catch lever to displace the same without the backing plate changing at once its position.
  • the long distance which the trigger has to travel in the direction of its normal position before a burst is interrupted has the advantage that the trigger need not be maintained at all costs in a rearmost position but can perform certain movements under the influence of the recoil movements of the weapon, without the burst being thereby interrupted unintentionally.
  • the trigger and the backing plate are coupled to each other by a pin-and-slot connection, the slot in the backing plate enabling the necessary movement relative to the trigger 3 to be performed.
  • the backing plate is conveniently loaded by a leg spring encircling its pivot, said leg spring having the advantage of permitting a large spring travel despite its relatively small space requirement.
  • a known trigger mechanism of the hammer firing type is employed, the catch lever and the backing plate being additionally incorporated therein.
  • a trigger mechanism of the hammer firing type generally offers the possibility of releasing the trigger precisely at the moment when the breech block has passed by the end of the catch lever, while a detent provided on the hammer is still within reach of the trigger lever. In this case, the hammer can still be caught while the breech block is moving forward to introduce a cartridge into the barrel which has run hot during firing.
  • the detent on the hammer and the trigger lever are associated so that the detent will come within reach of the trigger lever to be caught by the latter if when the weapon is being cocked, the hammer is rotated beyond the position in which it engages in its cocked position the under side of the breech block.
  • the hammer is rotated beyond the said position due to its inertia when during the return travel of the breech block it is moved at high speed.
  • the catching f the hammer by the trigger lever depends on the condition that the hammer is cocked at high speed, such as is done by the returning breech block upon the firing of a cartridge. If however, the weapon is cocked by hand, the breech block is moved at a low speed which does not suffice to throw the hammer beyond the aforementioned position.
  • a further embodiment of the invention provides a sprung projection on the hammer near the free end thereof, said projection projecting above the surface of the hammer facing towards the breech block and having an end face disposed approximately perpendicularly to the path of movement of the breech block and facing towards the latter. Because of this projection, when engaged by the breech block the hammer is rotated through a wider angle than corresponds to the position in which it engages the under side of the breech block. Therefore, it can be caught positively by the trigger lever even when cooking the weapon by hand or when shooting cartridges having an insuflicient charge.
  • the projection is spring loaded, the hammer can engage the under side of the breech block immediately upon snapping home in the trigger lever.
  • the projection can be defined in simple manner by the nose of a pull-over lever supported pivotally on the hammer, said pull-over lever having its pivot disposed closer to the end of the hammer than its end face and being maintained by a spring in a rest position in which its nose extends through a recess in the surface of the hammer facing towards the breech block.
  • the figure shows diagrammatically a longitudinal section of a trigger mechanism according to the invention, parts unimportant to the invention having been omitted.
  • the trigger mechanism shown in the drawing is designed for weapons with hammer firing and comprises a trigger box 1 in which all parts of the trigger device are accommodated. Said parts comprise a hammer 2 supported pivotably on a pivot 3 and loaded by a pressure fork 4, said pressure fork being under the action of a helical compression spring 5 supported against the trigger box 1.
  • the hammer 2 is maintained in the position shown in the drawing by a trigger lever 6 engaging with its nose 7 a corresponding detent 8 on the outer surface of the hammer.
  • the trigger lever 6 is pivotably supported on the same pivot 9 as the trigger 10 and is moreover movable in the directions indicated by the dual arrow 11. It is forced in the direction of the surface of the hammer 2 by a roller 13 mounted on the legs of a spring 12.
  • a spring (not shown) tends to hold the trigger lever 6 in its left-hand position as shown in the drawing.
  • the rear nose 14 is carried along by the lug 15 provided on the trigger 10 so that the trigger lever 6 is rotated counterclockwise as shown in the drawing and its nose 7 is moved out of the detent 8.
  • the hammer 2 can then strike forward and release a shot in known manner.
  • the catching pawl 16 whose transverse web coacts with another detent 18 on the hammer 2 releases the hammer 2 in known manner only when the release lever 19 has been forced downwards by the advancing breech block.
  • the trigger device shown in the drawing includes further a catch lever 21, which is pivotably supported near its upper end on a pivot 22 and disposed in such a manner that, in the position shown, its upper end 23 projects out of the trigger box 1 and into the path of movement of the breech block, whereas its end 24 located within the trigger box extends to a point adjacent the pivot 9 of the trigger 10 and is provided with a hook-shaped lug 25 extending substantially radially of the pivot 9 and at the same time, approximately tangentially of the circle around the pivot 22 of the catch lever 21.
  • the latter is loaded by a leg spring 26 disposed on the pivot 22 of said catch lever, said spring 26 tending to maintain the end 23 of the lever in the path of movement of the breech block.
  • a breech block In the position shown, a breech block would be maintained in its rearmost position by the end 23 of the catch lever 21.
  • a lug 28 is provided on the safety roll 27, said lug enabling the catch lever 21 to be rotated clockwise sufiiciently for its end 23 to clear the path of movement of the breech block when changing to semiautomatic firing. Consequently, the breech block retained by the catch lever when the weapon is set for full-automatic firing, is released when changing to semi-automatic firing so that it will feed a cartridge and move into its locked position.
  • the catch lever 21 is displaced from the position shown by a lug 29 when the trigger is pulled, said lug 29 being provided on an arm 30 connected to the trigger 10.
  • a backing plate 31 is rotatably supported on the pivot 9 mounting the trigger 10, said backing plate being provided with a relatively large-radius sector 32 and a considerably smaller-radius sector 33.
  • the backing plate 31 is loaded by a leg spring 34, which tends to swivel the backing plate counterclockwise as shown in the drawing, that is, in the same direction in which the trigger 10 is operated.
  • Inserted in the plate 31 is a pin 35 engaging an arc-shaped slot 36 in the trigger 10, said slot being concentric with the pivot 9.
  • the pin 35 and the slot 36 are so arranged that the backing plate 31 is maintained in the position shown against the action of its spring 34 when the trigger is released.
  • the hookshaped lug on the inner end of the catch lever 21 engages over the nose 37, said nose being limited by the flank between the larger-radius sector 32 and the smaller-radius sector 33 of the backing plate 31.
  • the lug 29 of the trigger comes into engagement on and displaces the catch lever 21.
  • the backing plate 31 remains at first in the position shown, in which its nose 37 engages the hook-shaped lug 25 of the catch lever 21.
  • the slot 36 is of sufficient length to enable the trigger to swivel. If then, the catch lever 21 has been rotated sufiiciently for the hook-shaped lug 25 to release the nose 37 of the backing plate, said backing plate is swivelled counterclockwise abruptly by the spring 34 to the extent permitted by the slot 36. It then backs up with its largerdiameter sector 32 the hook-shaped nose 25 on the catch lever 21 so that said lever cannot return to its initial position. In this position, the end 23 of the catch lever is clear of the path of movement of the breech block so that the latter can advance unimpeded. Also, the lug provided on the trigger 10 has displaced the trigger lever 6 clear of the detent 8 on the hammer 2 so that automatic firing results.
  • the catch lever 21 remains in its position last described, as it is backed up by the plate 31, although the lever is released by the lug 29. Only after the trigger 10 has been swivelled clockwise through a considerable angle is the pin 35 on the backing plate 31 carried along by the end of the slot 36 so that now the backing plate 31 is rotated together with the trigger 10. If then, the nose 37 of the backing plate slides off the hook-shaped lug 25 on the catch lever 21, the latter is returned abruptly into the initial position shown by the spring 26.
  • the lug 29 provided on the trigger 10 does not hamper this movement of the catch lever so that the speed of this movement depends exclusively on the force of the spring 26.
  • the length of the trigger lever 6, its range of movement in the directions indicated by the dual arrow 11 and the position of the detent 8 on the hammer 2 are tuned to each other so that even with the trigger 10 released, the detent 8 will come within reach of the nose 7 of the trigger lever 6 only if the hammer 2 is rotated much farther than to its position of engagement on the under side of the breech block, during whose return movement the hammer is cocked. Rather, the hammer 2 must swing beyond said position under the influence of its inertia, to come into engagement with the nose 7 of the trigger lever 6. This swinging movement is ensured at the high speeds encountered when firin normal ammunition.
  • a pull-over lever 41 is pivotally supported on a pivot 42 at the free end of the hammer 2.
  • Said pull-over lever 41 has a nose 43 which penetrates through a corresponding recess in the hammer 2 and has an end face 44 facing towards the breech block, and which is substantially vertically positioned on the path of movement of the breech block when the hammer is cocked.
  • the pivot 42 is disposed closer to the end of the hammer 2 then the end face 44, and the lever 41 is loaded by a spring 45, which maintains the lever 41 in a rest position in which its nose 43 projects above the surface 46 of the hammer 2 facing towards the breech block.
  • the invention can he applied not only to trigger mechanisms of the hammer firing type, but for example also to mechanisms of the pin firing type.
  • a trigger mechanism for automatic firearms having a changeover device to change both from semi-automatic to full-automatic firing and simultaneously from firing from closed bolt position to firing from open bolt position, said mechanism being disposed in a trigger box and comprising a catch lever which in its normal position, with the firearm set for automatic firing, projects into the path of movement of the breech block, catching and holding the latter in its rearmost position, the trigger of said mechanism being provided with a driving member for displacing said catch lever from its normal position, characterized in that on the same pivot (9) as the trigger (10), a backing plate (31) is supported, said backing plate being able to be rotated relative to said trigger through a smaller angle than the angle of rotation of said trigger, that said backing plate is preloaded in the direction of motion of the trigger and has two sectors (32 and 33) of different radii separated by a steep flank, and that said catch lever (21) at its end located in the trigger box (1) has a hook-shaped lug (25), said lug engaging the larger-radius sector (32) of said backing plate
  • a mechanism as claimed in claim 5 having a sprung trigger lever (6) and on the hammer, a detent (8) for said trigger lever, characterized in that said detent (8) and said trigger lever (6) are arranged so that the detent comes within reach of and can be caught by the trigger lever only when the hammer (2) as the weapon is being cocked is rotated beyond the position in which it engages the under side of the breech block in its cocked condition.
  • FOREIGN PATENTS 8 A mechanism as claimed in claim 7, characterized in that said projection is formed by the nose (43) of a pull-over lever (41) pivotally supported on said hammer, the pivot of said pull-over lever being disposed closer to the end of said hammer (2) than the latters end face STEPHEN C. BENTLEY, Assistant Examiner.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US691288A 1966-12-20 1967-12-18 Trigger mechanism for automatic firearms Expired - Lifetime US3446114A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0061342 1966-12-20

Publications (1)

Publication Number Publication Date
US3446114A true US3446114A (en) 1969-05-27

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Application Number Title Priority Date Filing Date
US691288A Expired - Lifetime US3446114A (en) 1966-12-20 1967-12-18 Trigger mechanism for automatic firearms

Country Status (7)

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US (1) US3446114A (de)
BE (1) BE708272A (de)
CH (1) CH490653A (de)
DE (1) DE1578385A1 (de)
ES (1) ES348421A1 (de)
FR (1) FR1548040A (de)
GB (1) GB1202729A (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4697495A (en) * 1984-12-10 1987-10-06 Fabrica D'armi P.Beretta S.P.A. Tripping mechanism for the conversion closed-bolt automatic rifles to open-bolt ones
US5623114A (en) * 1995-03-03 1997-04-22 Soper; Terry A. Selectable fire trigger mechanism
WO1997042461A1 (en) * 1996-05-06 1997-11-13 Colt's Manufacturing Company, Inc. Four position firearm fire control selector
US6510778B1 (en) 2000-12-28 2003-01-28 Custom Shooting Technologies, Inc. Automatic bolt hold-open assembly
US20070051236A1 (en) * 2005-09-06 2007-03-08 Colt Canada Corporation Trigger mechanism for firearms with self-loading actions
US20100236394A1 (en) * 2007-07-05 2010-09-23 Land Warfare Resource Corporation Firearm with facility for open-bolt and closed-bolt operation
US9506702B2 (en) 2014-01-10 2016-11-29 Jv Precision Machine Company Externally loading semi-automatic firearm with integral or non-removable feeding device
US9506711B2 (en) 2012-07-31 2016-11-29 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US9658011B2 (en) 2011-08-17 2017-05-23 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US9810495B2 (en) 2011-08-17 2017-11-07 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US9816546B2 (en) 2012-07-31 2017-11-14 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US9915497B2 (en) 2013-03-15 2018-03-13 Lwrc International Llc Firearm buffer system and buttstock assembly
US10240883B2 (en) 2012-07-31 2019-03-26 Lwrc International Llc Firearm receiver assembly
US11629925B2 (en) 2021-02-23 2023-04-18 Pdg, Inc. Firearm bolt hold-open assembly and methods of use thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE53255T1 (de) * 1985-03-22 1990-06-15 Beretta Armi Spa Schusszahlbegrenzer fuer serienfeuer an automatischen waffen.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB999514A (en) * 1963-06-01 1965-07-28 Rheinmetall Gmbh Improvements in or relating to trigger devices for the multi-part breech mechanisms of automatic firearms

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB999514A (en) * 1963-06-01 1965-07-28 Rheinmetall Gmbh Improvements in or relating to trigger devices for the multi-part breech mechanisms of automatic firearms

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4697495A (en) * 1984-12-10 1987-10-06 Fabrica D'armi P.Beretta S.P.A. Tripping mechanism for the conversion closed-bolt automatic rifles to open-bolt ones
EP0188179B1 (de) * 1984-12-10 1990-11-07 FABBRICA D'ARMI P.BERETTA S.p.A. Vorrichtung zum Umwandeln von automatischen Waffen mit geschlossenem Verschluss in automatische Waffen mit offenem Verschluss
US5623114A (en) * 1995-03-03 1997-04-22 Soper; Terry A. Selectable fire trigger mechanism
WO1997042461A1 (en) * 1996-05-06 1997-11-13 Colt's Manufacturing Company, Inc. Four position firearm fire control selector
US5760328A (en) * 1996-05-06 1998-06-02 Colt's Manufacturing Company, Inc. Four position firearm fire control selector
EP0894234A1 (de) * 1996-05-06 1999-02-03 Colt's Manufacturing Company, Inc. Auswahlvorrichtung mit vier unterschiedlichen positionen in einem feuerkontrollsystem einer feuerwaffe
EP0894234A4 (de) * 1996-05-06 2000-08-30 Colt S Mfg Co Auswahlvorrichtung mit vier unterschiedlichen positionen in einem feuerkontrollsystem einer feuerwaffe
US6510778B1 (en) 2000-12-28 2003-01-28 Custom Shooting Technologies, Inc. Automatic bolt hold-open assembly
US20070051236A1 (en) * 2005-09-06 2007-03-08 Colt Canada Corporation Trigger mechanism for firearms with self-loading actions
US20100236394A1 (en) * 2007-07-05 2010-09-23 Land Warfare Resource Corporation Firearm with facility for open-bolt and closed-bolt operation
US7806039B1 (en) * 2007-07-05 2010-10-05 Lwrc International, Llc Firearm with facility for open-bolt and closed-bolt operation
US11067352B2 (en) 2011-08-17 2021-07-20 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US10598452B2 (en) 2011-08-17 2020-03-24 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US9658011B2 (en) 2011-08-17 2017-05-23 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US9810495B2 (en) 2011-08-17 2017-11-07 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US11828560B2 (en) 2011-08-17 2023-11-28 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US11662169B2 (en) 2011-08-17 2023-05-30 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US11493292B2 (en) 2011-08-17 2022-11-08 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US10309739B2 (en) 2011-08-17 2019-06-04 Lwrc International Llc Bolt carrier and bolt for gas operated firearms
US10808748B2 (en) 2012-07-31 2020-10-20 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US10240883B2 (en) 2012-07-31 2019-03-26 Lwrc International Llc Firearm receiver assembly
US10697726B2 (en) 2012-07-31 2020-06-30 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US9506711B2 (en) 2012-07-31 2016-11-29 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US10895430B2 (en) 2012-07-31 2021-01-19 Lwrc International Llc Firearm receiver assembly
US11898589B2 (en) 2012-07-31 2024-02-13 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US9816546B2 (en) 2012-07-31 2017-11-14 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US11686548B2 (en) 2012-07-31 2023-06-27 Lwrc International Llc Firearm receiver assembly
US11530892B2 (en) 2012-07-31 2022-12-20 Lwrc International Llc Barrel nut assembly and method to attach a barrel to a firearm using such assembly
US9915497B2 (en) 2013-03-15 2018-03-13 Lwrc International Llc Firearm buffer system and buttstock assembly
US10591245B2 (en) 2013-03-15 2020-03-17 Lwrc International Llc Firearm buffer system and buttstock assembly
US11460265B2 (en) 2013-03-15 2022-10-04 Lwrc International Llc Firearm buffer system and buttstock assembly
US9506702B2 (en) 2014-01-10 2016-11-29 Jv Precision Machine Company Externally loading semi-automatic firearm with integral or non-removable feeding device
US11629925B2 (en) 2021-02-23 2023-04-18 Pdg, Inc. Firearm bolt hold-open assembly and methods of use thereof

Also Published As

Publication number Publication date
BE708272A (de) 1968-05-02
FR1548040A (de) 1968-11-29
ES348421A1 (es) 1969-06-16
GB1202729A (en) 1970-08-19
DE1578385A1 (de) 1970-11-05
CH490653A (de) 1970-05-15

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