US3333509A - Obturating piston for an automatic weapon with a gas-bleed passage - Google Patents

Obturating piston for an automatic weapon with a gas-bleed passage Download PDF

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Publication number
US3333509A
US3333509A US497946A US49794665A US3333509A US 3333509 A US3333509 A US 3333509A US 497946 A US497946 A US 497946A US 49794665 A US49794665 A US 49794665A US 3333509 A US3333509 A US 3333509A
Authority
US
United States
Prior art keywords
piston
gas
barrel
obturating
pressure chamber
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
US497946A
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English (en)
Inventor
Muhlemann Ernst
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.)
OC Oerlikon Corp AG Pfaeffikon
Original Assignee
Oerlikon Buehrle Holding AG
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 Oerlikon Buehrle Holding AG filed Critical Oerlikon Buehrle Holding AG
Application granted granted Critical
Publication of US3333509A publication Critical patent/US3333509A/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
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
    • F41A5/26—Arrangements or systems for bleeding the gas from the barrel
    • 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
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated
    • F41A5/26—Arrangements or systems for bleeding the gas from the barrel
    • F41A5/28—Adjustable systems

Definitions

  • This invention relates to an automatic fire arm wherein a connection between the gas bleed in an exchangeable barrel and a passage in a receiver leading to a gas pressure chamber contains a longitudinal bored obturating piston.
  • a further object of the invention is to provide an obturating piston located in the receiver which is pressed against the outer surface of the barrel by the gas pressure in a back pressure chamber located at the downstream side of the piston.
  • FIGURE 2 is a partial plan view of a portion of the firearm shown in FIGURE 1.
  • FIGURE 3 is a cross-sectional view taken along section line IIIIII of FIGURE 1 looking in the direction of the arrows, and
  • FIGURE 4 shows a partial view corresponding to the view shown in FIGURE 1 of an alternative embodiment of the invention.
  • a barrel is inserted in a receiver 11 and is maintained in such receiver in the position shown in FIGURE 1 by means of a bayonet slot joint 12.
  • a pin 13 inserted at the bottom of the receiver 11 engages the joint 12 so as to lock the barrel 10 in an angular position relative to the receiver.
  • the receiver 11 is provided with a housing 14 into which an insert 15 is screwed.
  • the insert 15 has a cylindrical chamber 16 wherein the gas piston 17 reciprocates.
  • the gas piston 17 transmits its motion to the mechanism for unlocking the breech mechanism of the firearm via the piston rod 18 in the well known manner which is therefore not described.
  • a block 151 At the front end of the piston 15 at the left as shown in FIGURES 1 and 2, a block 151 has two mutually perpendicular bores 23 forming the back pressure chamber and 29 forming a part of the gas bleed passage connecting the chamber 16 with the concave cylindrical surface 152 of the block 151 extending longitudinally over the surface of the barrel as shown more particularly in FIGURE 3.
  • the bore 28 which is arranged perpendicular to the longitudinal axis of the barrel widens conically at 283 to the diameter of its coaxial continuation 284 prior to the junction with the bore 29 extending parallel to the barrel.
  • a regulating needle 30 is screwed into the bore 284 and extends to the upper surface of the block 151.
  • the tip 301 of the regulating needle 30 has the same shaped cone as the portion 283 and forms the front end of a cylindrical portion 302 whose diameter is less than that of the main body of the needle 30.
  • the total crosssectional area of the annular space surrounding the needle tip 301 is less than that of the section 282 of the drillway between the obturating piston 19 and the conical widening 283.
  • the rate of fire of the firearm can be simply controlled by screwing in and out of the regulating needle 30 so as to vary the cross-sectional area of this throttle point.
  • the cylindrical obturating piston 19 has a smooth peripheral surface and makes a close sliding fit in the enlarged part 281 of the bore 28 so that its concave end surface 192 which adjoins the outer surface of the barrel lies against the surface 213 of the insert 21 which is flush with the barrel surface when the obturating piston is in the firing position as shown in FIGURES 1 and 3.
  • a pin 31 is located in a bore extending at right angles to the longitudinal axis of the barrel and engages with a flat portion 194 provided in the side of the obturating piston 19.
  • the pin 31 prevents the obturating piston 19 from falling out when the firearm is dismantled and also prevents rotation thereof about its axis but permits the piston 19 to have a limited longitudinal stroke.
  • the bore 191 through the piston 19 has a conical bell-mouth extending to the flat end surface 193 of the piston 19.
  • the block 15 contains an exchangeable hard metal jet 32 placed between the obturating piston 19 and the bore 29.
  • the bore provided in the jet 32 is of smaller diameter than the bore 191 in the obturating piston thereby creating the back-pressure required to act upon the end-face 193 of the piston and determine the rate of fire of the firearm.
  • An automatic weapon comprising an exchangeable barrel having an outer surface and a gas-bleed passage, a receiver containing a pressure chamber, a connection between said gas-bleed passage and said pressure chamber, a back pressure chamber in said connection, an axially perforated obturating piston located in said connection having two opposite faces, one of said faces adapted to be forced against said surface and the other of said faces forming a part of said back-pressure chamber, and means for providing gas-pressure in said back pressure chamber to force said obturating piston against said surface.
  • said back pressure chamber has an exit in the form of a jet and a regulating needle for varying the crosssectional area of said exit.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Earth Drilling (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Toys (AREA)
US497946A 1964-10-20 1965-10-19 Obturating piston for an automatic weapon with a gas-bleed passage Expired - Lifetime US3333509A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1362064A CH425546A (de) 1964-10-20 1964-10-20 Selbsttätige Feuerwaffe

Publications (1)

Publication Number Publication Date
US3333509A true US3333509A (en) 1967-08-01

Family

ID=4393953

Family Applications (1)

Application Number Title Priority Date Filing Date
US497946A Expired - Lifetime US3333509A (en) 1964-10-20 1965-10-19 Obturating piston for an automatic weapon with a gas-bleed passage

Country Status (8)

Country Link
US (1) US3333509A (de)
AT (1) AT258166B (de)
BE (1) BE671095A (de)
CH (1) CH425546A (de)
DE (1) DE1453933A1 (de)
FR (1) FR1450319A (de)
GB (1) GB1129303A (de)
SE (1) SE319405B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4765224A (en) * 1986-08-15 1988-08-23 Morris Michael C Automatic rifle gas system
US4798124A (en) * 1986-03-20 1989-01-17 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Gas removal apparatus for an automatic firing weapon controlled by the gas pressure
US5945626A (en) * 1997-09-09 1999-08-31 Colt's Manufacturing Company Inc. Gas operated firearm with clamp on gas block
US6868770B2 (en) * 2003-05-31 2005-03-22 Boje Cornils Autoloading gas port structure
US20090007478A1 (en) * 2005-09-13 2009-01-08 Norbert Fluhr Gas cylinder components for use with firearms
US20100218671A1 (en) * 2008-12-30 2010-09-02 Magpul Industries Corporation Adjustable and Suppressible Gas Operating System for an Automatic Firearm
US7856917B2 (en) 2008-01-31 2010-12-28 John Noveske Switchblock
US8528458B2 (en) 2011-07-27 2013-09-10 Bernard T. Windauer Pressure-regulating gas block
US20140076149A1 (en) * 2011-07-19 2014-03-20 Jason Mark Adams Adjustable Firearm Gas Block
US8869674B2 (en) 2012-02-14 2014-10-28 Michael Alan Ruck Gas piston control system for a firearm
US20150176933A1 (en) * 2013-12-23 2015-06-25 Jason Mark Adams Adjustable Volume Piston System
US9719739B2 (en) 2014-02-06 2017-08-01 Bernard (Bernie) T. Windauer Gas block balancing piston for auto-loading firearm
US11614297B2 (en) * 2018-12-10 2023-03-28 Maxim Defense Industries, LLC Gas block and barrel assembly and method of fabricating same
US20240077264A1 (en) * 2021-03-28 2024-03-07 Jordan Kristomas Kennedy System for a multi-caliber self-loading action assembly
US20250035392A1 (en) * 2023-07-28 2025-01-30 JKJD Ventures, LLC Gas block for a firearm

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH626988A5 (en) * 1978-02-06 1981-12-15 Eidgenoess Waffenfab Automatic firearm
DE202011103723U1 (de) 2011-07-27 2011-11-07 D.A.R. Gmbh Gasentnahmevorrichtung für Selbstladebüchsen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1431057A (en) * 1921-03-25 1922-10-03 Sutter Charles Automatic machine gun
AT191769B (de) * 1955-07-11 1957-09-10 Oerlikon Buehrle Ag Dichtungseinrichtung für die Gasentnahmebohrung bei Gasdruckladern
US2818785A (en) * 1953-07-27 1958-01-07 Brevets Aero Mecaniques Improvements in automatic guns having a detachable barrel
US2873650A (en) * 1957-05-24 1959-02-17 Jr Harry E Pinkerton Fluid transfer rate control for a firing mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1431057A (en) * 1921-03-25 1922-10-03 Sutter Charles Automatic machine gun
US2818785A (en) * 1953-07-27 1958-01-07 Brevets Aero Mecaniques Improvements in automatic guns having a detachable barrel
AT191769B (de) * 1955-07-11 1957-09-10 Oerlikon Buehrle Ag Dichtungseinrichtung für die Gasentnahmebohrung bei Gasdruckladern
US2873650A (en) * 1957-05-24 1959-02-17 Jr Harry E Pinkerton Fluid transfer rate control for a firing mechanism

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4798124A (en) * 1986-03-20 1989-01-17 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Gas removal apparatus for an automatic firing weapon controlled by the gas pressure
CH669839A5 (de) * 1986-03-20 1989-04-14 Oerlikon Buehrle Ag
US4765224A (en) * 1986-08-15 1988-08-23 Morris Michael C Automatic rifle gas system
US5945626A (en) * 1997-09-09 1999-08-31 Colt's Manufacturing Company Inc. Gas operated firearm with clamp on gas block
US6868770B2 (en) * 2003-05-31 2005-03-22 Boje Cornils Autoloading gas port structure
US20090007478A1 (en) * 2005-09-13 2009-01-08 Norbert Fluhr Gas cylinder components for use with firearms
US7637199B2 (en) * 2005-09-13 2009-12-29 Heckler & Koch Gmbh Gas cylinder components for use with firearms
US7856917B2 (en) 2008-01-31 2010-12-28 John Noveske Switchblock
US20100218671A1 (en) * 2008-12-30 2010-09-02 Magpul Industries Corporation Adjustable and Suppressible Gas Operating System for an Automatic Firearm
US20140076149A1 (en) * 2011-07-19 2014-03-20 Jason Mark Adams Adjustable Firearm Gas Block
US8813632B2 (en) * 2011-07-19 2014-08-26 Jason Mark Adams Adjustable firearm gas block
US8528458B2 (en) 2011-07-27 2013-09-10 Bernard T. Windauer Pressure-regulating gas block
US8869674B2 (en) 2012-02-14 2014-10-28 Michael Alan Ruck Gas piston control system for a firearm
US20150176933A1 (en) * 2013-12-23 2015-06-25 Jason Mark Adams Adjustable Volume Piston System
US9719739B2 (en) 2014-02-06 2017-08-01 Bernard (Bernie) T. Windauer Gas block balancing piston for auto-loading firearm
US11614297B2 (en) * 2018-12-10 2023-03-28 Maxim Defense Industries, LLC Gas block and barrel assembly and method of fabricating same
US20240077264A1 (en) * 2021-03-28 2024-03-07 Jordan Kristomas Kennedy System for a multi-caliber self-loading action assembly
US12130108B2 (en) * 2021-03-28 2024-10-29 Jordan Kristomas Kennedy System for a multi-caliber self-loading action assembly
US20250035392A1 (en) * 2023-07-28 2025-01-30 JKJD Ventures, LLC Gas block for a firearm
US12339087B2 (en) * 2023-07-28 2025-06-24 JKJD Ventures, LLC Gas block for a firearm

Also Published As

Publication number Publication date
BE671095A (de) 1966-02-14
DE1453933A1 (de) 1969-07-24
FR1450319A (fr) 1966-05-06
AT258166B (de) 1967-11-10
GB1129303A (en) 1968-10-02
SE319405B (de) 1970-01-12
CH425546A (de) 1966-11-30

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