US2798415A - Breechbolt lock for automatic firearms - Google Patents

Breechbolt lock for automatic firearms Download PDF

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Publication number
US2798415A
US2798415A US399127A US39912753A US2798415A US 2798415 A US2798415 A US 2798415A US 399127 A US399127 A US 399127A US 39912753 A US39912753 A US 39912753A US 2798415 A US2798415 A US 2798415A
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US
United States
Prior art keywords
breech
sliding system
block
weight
case
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
US399127A
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English (en)
Inventor
Maillard Bernard
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.)
Co "brevets Aero-Mecaniques" S A
Co BREVETS AERO MECANIQUE
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Co BREVETS AERO MECANIQUE
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Publication of US2798415A publication Critical patent/US2798415A/en
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Expired - Lifetime legal-status Critical Current

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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
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/78—Bolt buffer or recuperator means
    • 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
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • 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
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/70—Anti-rebound arrangements, i.e. preventing rebound of the bolt out of the firing position

Definitions

  • the present invention relates to automatic loading firearms (this term including, in the following specification and claims, semi-automatic firearms the reloading of which takes place automatically but the firing of which is performed manually for every shot, fully automatic firearms firing by bursts and firearms capable of working either semi-automatically or automatically) in which the movable breech-block is temporarily locked in its barrel closing (i. e. frontward end) position by a movable system capable, once the breech-block has reached said end of its frontward stroke, of sliding with respect to said breechblock so as temporarily to prevent unlocking thereof.
  • said sliding system cooperates with the locking piece which holds the breech-block in said position in the following manner:
  • Elastic return means first drive toward the front the whole of the breech-block, its locking piece and the sliding system.
  • the sliding system has a supplementary frontward movement in the course of which it keeps the breech-block locking piece in active position.
  • a shot is fired, generally by a firing pin carried by the sliding system.
  • Thebreech-block and its locking -piece then slide in the rearward direction.
  • I provide a weight mounted in oscillating fashion in the'breech-case and means for transmitting'thereto, by a shock, a substantial-portion of the kinetic energy of the sliding system during every supplementary stroke thereof, so as tozreduce rebounding of said system when it strikes its front abutmentatthe end of each of said supplementary strokes,:means for damping the oscillations of said weight being provided to-reduee the kinetic energy thereof to a negligible'valueiwhenwsaid shock transmitting means again connectLthe weight with the sliding system during the return movement thereof after its limited rebounding, whereby the weight gives back to the sliding system practicallymothing of the energy it had received therefrom.
  • FIG. 1 is an elevational view with parts cut away of the breech mechanism of an automatic firearm made according to my invention.
  • Fig. 2 is a cross section on line IIII of Figs. 1 and 3'.
  • Fig. 3 is a diagram showing in plan view the sliding system included in said breech mechanism, this system being shown in position with respect to the side walls of the breech-case supposed to have been cut on the line III-III of Fig. 2.
  • Figs. 4 and 5 are an explanatory diagram and a curve which will be hereinafter referred to.
  • the firearm is of any suitable conventional construc: tion.
  • it includes a barrel 1 rigid at the rear with a breech-case 2 in which is mounted, slidable Parallel to the firing axis, a movable breech-block 3 subjected to the action of a recuperator spring 4 which constantly urges it frontwardly.
  • the breech-block is provided with a locking piece 5 adapted to engage a surface 5a rigid with the breech-case so as to lock the breech-block safely in end front position whenthe shot is being fired.
  • locking piece 5 When the breech-block has reached the end of its frontward stroke, locking piece 5 is moved down into active position, i. e. into engagement with shoulder 5a, thus releasing sliding plates 6 which can thus have a supplementary frontward displacement of a length represented by a on Fig. 4, so as to bring suitable portions of. slide plates 6 over looking piece 5 which is thus held in its active position as shown by Fig. 1.
  • a gas tap control system acts upon slide plates 6 through a fork 9 and pushpieces 10 so as to impart a recoil movement to said slide plates.
  • Eaehabutment 12 is operatively connectedto a weight 13 itself movably guided in the breech-case between a front abutment 14 and a rear abutment 15.
  • Each weight 13 cooperates with an elastic system, such as a spring 16, urging said weight 13 toward its rear abutment 15.
  • an elastic system such as a spring 16
  • I provide, for each weight 13, a play or maximum amplitude of displacement "b higher than the residual stroke "r" above referred to.
  • the residual stroke r has been given a value of 0.4 mm. and amplitude 71" a value equal to 3.35 mm.
  • Fig. 4 diagrammatically shows the essential elements of such a breech mechanism the operation of which is illustrated by the diagram of Fig. 5 on which I have plotted in abscissas the times (in seconds) and in ordinates the displacements (in millimeters).
  • the solid line curves show the movement of weights l3 and the dotted line curve the movement of slide plates 6.
  • Weights 13 are then thrown frontwardly; they leave their rear abutment 1S and abutments 12 loose contact with projections 11 (position shown by Fig. 3). Weights 13 finally come to strike their front abutment 14 (point B of dia gram of Fig. 5). In the meantime, slide plates 6 the movement of which has been slowed down by their impact against weights 13 have come to strike their front abutment 17 (point C of the diagram) and have startedrebounding rearwardly. As for weights 13, after they have struck their front abutment (point B), they also reboundv rearwardly until they again strike their rear abutment 15 (point D).
  • weights 13 collect from the sliding system, when they first come into contact therewith, an amount of energy suflicient to prevent said sliding system from rebounding dangerously toward the rear after striking its front abutment, and that said weights do not come again into contact with said sliding system until they have lost most of the energy collected during their initial contact therewith.
  • weights 13 might take place in directions other than parallel to that 4 of the sliding system, in which case instead of. providing abutments 12 rigid with the weights, 1 might interpose, between these parts, an operative connection adapted to transmit to the weights the shock received by the abutments.
  • An automatic loading firearm which comprises, in combination, a breech-case, a reciprocating breechblock slidable longitudinally in said breech-case between a front and a rear position with respect thereto, a locking piece carried by said breech-block movable transversely with respect thereto between an active and a retracted position and arranged to cooperate, in said active position, with said breeclrcase to lock said breech-block in said front end position temporarily for the firing of every shot, an inertia operative sliding system carried by said breech-block movably with respect thereto between a front and a rear position, resilient means between said breech-case and said sliding system for urging said sliding system in the frontward direction, means carried by said sliding system for holding said locking piece in said active position thereof as long as said sliding system is ahead of said rear position thereof with respect to said breech-block, at least one weight mounted for oscillation in said breechcase and mounted independently of but freely movable with said-sliding
  • An automatic loading firearm which comprises, in combination, a breech-case, a reciprocating breech-block slidable longitudinally in said breech-case between a front and a rear position with respect thereto, a locking piece carried by said breech-block movable transversely with respect thereto between an active and a retracted position and arranged to cooperate in said active position with said breech-case temporarily to lock said breech-block in said front end position with respect to said breech-case for the firing of every shot, an inertia operative sliding system carried by said breech-block movably with respect thereto between a front and a rear position, resilient means between said breech-case and said sliding system for urging said sliding system in the frontward direction, means carried by said sliding system for holding said locking piece in said active position thereof as long as said sliding system is ahead of said rear position thereof with respect to said breech-block, at least one weight mounted for oscillation in said breech-case and mounted independently of but freely mov
  • An automatic loading firearm which comprises, in combination, a breech-case, a reciprocating breech-block slidable longitudinally in said breech-case between a front and a rear position with respect thereto, a locking piece carried by said breech-block movable transversely with respect thereto between an active and a retracted position and arranged to cooperate in said active position with said breech-case temporarily to lock said breechblock in said front end position with respect to said breech-case for the firing of every shot, an inertia operative sliding system carried by said breech-block movably with respect thereto between a front and a rear position, resilient means between said breech-case and said sliding system for urging said sliding system in the frontward direction, means carried by said sliding system for holding said locking piece in said active position thereof as long as said sliding system is ahead of said rear position thereof with respect to said breech-block, at least one weight mounted for reciprocation in said breech-case in a direction parallel to that of the

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vibration Dampers (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
US399127A 1952-12-24 1953-12-18 Breechbolt lock for automatic firearms Expired - Lifetime US2798415A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU741271X 1952-12-24

Publications (1)

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US2798415A true US2798415A (en) 1957-07-09

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US399127A Expired - Lifetime US2798415A (en) 1952-12-24 1953-12-18 Breechbolt lock for automatic firearms

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US (1) US2798415A (en(2012))
BE (1) BE524696A (en(2012))
DE (1) DE1033551B (en(2012))
FR (1) FR1093082A (en(2012))
GB (1) GB741271A (en(2012))
LU (1) LU31901A1 (en(2012))
NL (2) NL183823B (en(2012))

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4246910A (en) 1977-08-01 1981-01-27 Philip Morris Incorporated Cigarette filter material comprising compounds of iron in high oxidation states

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1771311A (en) * 1928-05-16 1930-07-22 Anciens Ets Hotchkiss & Cie High-speed reciprocating mechanism
US2361985A (en) * 1939-10-14 1944-11-07 Birkigt Marc Absorbing means especially for firearms
US2451624A (en) * 1947-08-27 1948-10-19 Remington Arms Co Inc Inertia rate of fire retarders
US2536997A (en) * 1945-12-06 1951-01-02 Oerlikon Buehrle Ag Pivoted lock mechanism for breech bolts of automatic firearms
GB678425A (en) * 1950-02-18 1952-09-03 Brevets Aero Mecaniques Improvements in automatic loading firearms having a breechblock temporarily held in locked position by a sliding system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1771311A (en) * 1928-05-16 1930-07-22 Anciens Ets Hotchkiss & Cie High-speed reciprocating mechanism
US2361985A (en) * 1939-10-14 1944-11-07 Birkigt Marc Absorbing means especially for firearms
US2536997A (en) * 1945-12-06 1951-01-02 Oerlikon Buehrle Ag Pivoted lock mechanism for breech bolts of automatic firearms
US2451624A (en) * 1947-08-27 1948-10-19 Remington Arms Co Inc Inertia rate of fire retarders
GB678425A (en) * 1950-02-18 1952-09-03 Brevets Aero Mecaniques Improvements in automatic loading firearms having a breechblock temporarily held in locked position by a sliding system

Also Published As

Publication number Publication date
NL183823B (nl)
LU31901A1 (en(2012))
BE524696A (en(2012))
NL92601C (en(2012))
FR1093082A (fr) 1955-04-29
DE1033551B (de) 1958-07-03
GB741271A (en) 1955-11-30

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