US3893369A - Inertia device for retarding the unlocking of a bolt assembly - Google Patents

Inertia device for retarding the unlocking of a bolt assembly Download PDF

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Publication number
US3893369A
US3893369A US334976A US33497673A US3893369A US 3893369 A US3893369 A US 3893369A US 334976 A US334976 A US 334976A US 33497673 A US33497673 A US 33497673A US 3893369 A US3893369 A US 3893369A
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US
United States
Prior art keywords
bolt
ribs
link
firing
barrel
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
US334976A
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English (en)
Inventor
Giovanni Benelli
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.)
Benelli Armi SpA
Original Assignee
Benelli SpA
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
Priority claimed from IT4401272A external-priority patent/IT952003B/it
Application filed by Benelli SpA filed Critical Benelli SpA
Application granted granted Critical
Publication of US3893369A publication Critical patent/US3893369A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F41A3/00—Breech mechanisms, e.g. locks
    • F41A3/12—Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
    • F41A3/14—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively
    • F41A3/32—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the bolt being rocked about a notional axis transverse to the barrel axis

Definitions

  • ABSTRACT The pistol comprises a bolt provided with ribs extending transversely to the bolt axis and adapted to en in and disengage from corresponding mating g Italy [22] Filed: Feb. 23, 1973 gage 21 Appl. No.. 334,976 moves provided in the receiver breech upon a slight rotation of said bolt with respect to said receiver breech.
  • the automatic firing and defense pistol is characterized in that it comprises a bolt provided with ribs extending transversely to the bolt axis and adapted to engage in and disengage from corresponding mating grooves provided in the re DCver breech upon a slight rotation of said bolt relative to said receiver breech, and a link one end of which is articulated in a cavity provided in said bolt and the other end of which in subjected to the pressure exerted thereon by said bolt carrier under the bias of a preloaded spring, the contact of said link with said bolt and bolt carrier being established in such locations relative to the pistol axis that, upon firing, the force applied to said link by said bolt carrier due to the inertia of the latter and the force applied to said link by said bolt due to the exhausted gases will generate a torque which causes said link to rotate in such a direction that said link holds said bolt urged against the receiver breech, with said ribs engaged in the mating grooves which are provided in the receiver breech whereas, once the inertial force
  • FIG. I is a diagrammatic, fragmentary, axial sectional view of a pistol in accordance with the invention, with the bolt assembly in a locking position and therefore ready for firing;
  • FIG. 2 is a sectional view similar to FIG. 1, showing the pistol after firing;
  • FIG. 3 is a sectional view similar to FIG. 1 and 2, showing the pistol with the bolt assembly in an unlocking position;
  • FIG. 4 is a fragmentary. axial sectional view ofthe receiver breech of the pistol shown in FIGS. 1 to 3;
  • FIG. 5 is a fragmentary cross-section of the receiver breech taken along the line 55 of FIG. 4;
  • FIG. 6 is a side elevational view of the bolt assembly of the pistol of FIGS. l to 3;
  • FIG. 7 is a cross-section of the bolt assembly taken along the line 77 of FIG. 6.
  • the automatic pistol comprises a fixed barrel 1, rigidly connected to a receiver breech l0 and a receiver 9 so as to form an unitary body therewith.
  • a bolt assembly 3 has an outer semicylindrical portion at its bottom provided with two crescent ribs 7 (see FIGS. 6 and 7) exactly aligned with two mating grooves 8 provided in the receiver breech 10 (see FIGS. 4 and 5).
  • These crescent ribs 7 have inclined surfaces 12 adapted to cooperate with corresponding inclined surfaces 11 provided in the grooves 8.
  • a bolt carrier 2 fastened to a stop element 5 by means ofa splined coupling (not shown) carries at one end a cylindrical spring housing 15 for receiving a preloaded spring 6 which bears at one end against the bottom of the spring housing and at the other end against a washer 16 received on a spring guide rod 17 extending from an abutment surface 18 of the receiver breech 10, the spring 6 holding the washer 16 against said abutment surface 18.
  • the bolt assembly 3 has a spherical cavity provided therein, which houses a spherical end of a locking link 4, the other end of which bears against the upper wall of the bolt carrier 2 and also against the stop element 5 by being held in engagement with the latter by the force of the spring 6.
  • the link 4 is inclined about 45 relative to the bolt axis and the link exerts on the bolt a thrust which causes the latter to be held-down with the crescent ribs 7 in firm engagement in the mating grooves 8 of the receiver breech l0 and, at the same time, against the bottom of the cartridge case 20 of the cartridge introduced into the barrel 1.
  • the bolt 3 has a through hole 21 provided therein (see FIG. 7), in which a firing pin 13 is received which is intended to cooperate with a hammer 14, only fragmentarily shown.
  • the inertia of the bolt carrier and stop element assembly 2-5 results in a force acting on the link 4 in a location where it is in contact with the bolt carrier and stop element assembly 2-5. Simultaneously, the action of gases on the bolt results in a force acting on the fulcrum of the link 4.
  • the resultant will be a force tending to hold-down the bolt 3 with the crescent ribs 7 in engagement within the mating grooves 8 of the receiver breech 10.
  • the system provides for an extremely stiff locking of the bolt assembly.
  • the system attains the object to provide a positive bolt locking for the fraction of time necessary for the bullet to be ejected from the barrel.
  • An automatic firing and defense pistol comprising a fixed barrel having an axis
  • a bolt carrier axially aligned with said barrel and located adjacent thereto;
  • said bolt carrier including a stop element extending transversely to said axis
  • said bolt assembly slidably mounted within said bolt carrier.
  • said bolt assembly having a plurality of projecting ribs. and said ribs having faces inclined with respect to said axis;
  • a receiver breech attached to said barrel and including a plurality of grooves corresponding to and providing mating engagement with said ribs prior to firing of the pistol;
  • said link having an inclination of approximately 45 to said axis prior to firing. and said link temporarily maintaining said inclination and rib engagement upon firing due to inertia force of said bolt carrier and stop element;
  • said link movable to be axially aligned with said barrel due to force of residual gases following firing thereby allowing disengagement of said ribs and sliding movement of said bolt assembly.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Toys (AREA)
  • Automotive Seat Belt Assembly (AREA)
US334976A 1972-02-29 1973-02-23 Inertia device for retarding the unlocking of a bolt assembly Expired - Lifetime US3893369A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4401272A IT952003B (it) 1972-02-29 1972-02-29 Chiusura metastabile con disposi zione di opposizione all apertura delle parti in movimento nella fa se di esplosione della carica rea lizzata tramite la posizione reci proca di tre organi e cioe ottura tore biella e carrello per pistole da tiro e difesa
CH1284974A CH570598A5 (es) 1972-02-29 1974-09-20

Publications (1)

Publication Number Publication Date
US3893369A true US3893369A (en) 1975-07-08

Family

ID=25711124

Family Applications (1)

Application Number Title Priority Date Filing Date
US334976A Expired - Lifetime US3893369A (en) 1972-02-29 1973-02-23 Inertia device for retarding the unlocking of a bolt assembly

Country Status (6)

Country Link
US (1) US3893369A (es)
BE (1) BE795985A (es)
CH (1) CH570598A5 (es)
DE (1) DE2309617C2 (es)
FR (1) FR2174292B1 (es)
GB (1) GB1421587A (es)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974493A (en) * 1988-12-20 1990-12-04 Yeffman Paul L Shock absorbing buffer and recoil reducer
US6550173B2 (en) * 2000-07-14 2003-04-22 Fabram S.P.A. Fabbrica Bresciana Armi Semiautomatic rifle with inertial operation
US8356543B2 (en) 2009-10-02 2013-01-22 Defense Deisigns, LLC Firearm firing mechanism
US9513076B2 (en) 2014-05-15 2016-12-06 Savage Arms, Inc. Firearm with reciprocating bolt assembly
US10436530B2 (en) 2016-10-25 2019-10-08 22 Evolution Llc Radial delayed blowback operating system, such as for AR 15 platform
US10852082B1 (en) 2018-04-19 2020-12-01 The United States Of America As Represented By The Secretary Of The Army Backward swept magazine for pistol
US10941993B2 (en) 2016-10-25 2021-03-09 22 Evolution Llc Radial delayed blowback operating system for a firearm incorporating a rotational inducing profile established between bolt lugs and a mating receiving pattern within the upper receiver or a trunnion installed within the receiver
US10948249B2 (en) 2016-10-25 2021-03-16 22 Evolution Llc Radial delayed blowback operating system for a firearm including a recoil discharge force attenuation interface between a cam pin and a clearance pocket configured within an upper receiver of the firearm
RU2783410C1 (ru) * 2022-01-11 2022-11-14 Игорь Алексеевич Иванов Пистолет

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1391496A (en) * 1915-07-30 1921-09-20 John D Pedersen Firearm
US2247011A (en) * 1939-03-21 1941-06-24 Western Cartridge Co Receiver and trigger-plate assembly for firearms
US2466902A (en) * 1946-11-21 1949-04-12 Olin Ind Inc Inertia operating member for automatic firearms

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE301769C (es) * 1914-11-23

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1391496A (en) * 1915-07-30 1921-09-20 John D Pedersen Firearm
US2247011A (en) * 1939-03-21 1941-06-24 Western Cartridge Co Receiver and trigger-plate assembly for firearms
US2466902A (en) * 1946-11-21 1949-04-12 Olin Ind Inc Inertia operating member for automatic firearms

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4974493A (en) * 1988-12-20 1990-12-04 Yeffman Paul L Shock absorbing buffer and recoil reducer
US6550173B2 (en) * 2000-07-14 2003-04-22 Fabram S.P.A. Fabbrica Bresciana Armi Semiautomatic rifle with inertial operation
US8356543B2 (en) 2009-10-02 2013-01-22 Defense Deisigns, LLC Firearm firing mechanism
US10788277B2 (en) 2014-05-15 2020-09-29 Savage Arms, Inc. Semiautomatic firearm
US9513076B2 (en) 2014-05-15 2016-12-06 Savage Arms, Inc. Firearm with reciprocating bolt assembly
US9599417B2 (en) 2014-05-15 2017-03-21 Savage Arms, Inc. Extractor mechanism for firearm
US9810496B2 (en) 2014-05-15 2017-11-07 Savage Arms, Inc. Semiautomatic firearm
US11713933B2 (en) 2014-05-15 2023-08-01 Savage Arms, Inc. Semiautomatic firearm
US10436530B2 (en) 2016-10-25 2019-10-08 22 Evolution Llc Radial delayed blowback operating system, such as for AR 15 platform
US10941993B2 (en) 2016-10-25 2021-03-09 22 Evolution Llc Radial delayed blowback operating system for a firearm incorporating a rotational inducing profile established between bolt lugs and a mating receiving pattern within the upper receiver or a trunnion installed within the receiver
US10948249B2 (en) 2016-10-25 2021-03-16 22 Evolution Llc Radial delayed blowback operating system for a firearm including a recoil discharge force attenuation interface between a cam pin and a clearance pocket configured within an upper receiver of the firearm
US10557673B2 (en) 2016-10-25 2020-02-11 22 Evolution Llc Radial delayed blowback operating system, such as for AR 15 platform
US10852082B1 (en) 2018-04-19 2020-12-01 The United States Of America As Represented By The Secretary Of The Army Backward swept magazine for pistol
RU2783410C1 (ru) * 2022-01-11 2022-11-14 Игорь Алексеевич Иванов Пистолет

Also Published As

Publication number Publication date
BE795985A (fr) 1973-06-18
GB1421587A (en) 1976-01-21
FR2174292A1 (es) 1973-10-12
DE2309617C2 (de) 1984-08-09
CH570598A5 (es) 1975-12-15
DE2309617A1 (de) 1973-09-06
FR2174292B1 (es) 1976-10-29

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