Class 89/191.02 - Annular piston

Subclass of Class 89 - Ordnance
Definition: Devices wherein the gas-operated device is circular in shape.
No. of patents: 39
Last issue date: 05/01/2012

Number	Title	Issue Date
8166864	Kit and method for converting a gas-operated gas-driven firearm to a gas-operated operating rod driven firearm A kit for modifying a bolt carrier group actuating apparatus of a firearm configured by its original manufacturer to have a gas-driven bolt carrier has a gas expansion assembly and an operating rod. The gas expansion assembly is configured for receiving combustion g...	05/01/2012
7610843	Individual firearm with improved recock device An individual firearm with improved recock device comprising a casing (12), a barrel (13), a breech bolt (14), a breech bolt slide (15), wherein the barrel (13) has at least one hole (32), or gas bleeding port, communicating...	11/03/2009
7418898	M16 modified with pushrod operating system and conversion method A push rod operating system for an AR-15/M-16 rifle includes an AR-15/M-16 rifle having a barrel coupled to an upper receiver, a bolt carrier carried by the upper receiver, and a mechanical key coupled to the bolt carrier. A gas block is coupled to the barrel, the g...	09/02/2008
6508160	Gas-flow device for automatic shotguns This is a gas-flow device for semiautomatic or automatic shotguns, which consists of a gas-flow cylinder, closed at the front part by a flange with gas discharge ports (17) around the ammunition magazine, opposite the cylinder, a circular valve (18) that ...	01/21/2003
6412390	Low impulse firing adapter for combination gas and recoil operated weapons A low impulse firing attachment and companion ammunition for combination gas and recoil operated automatic weapons is comprised of a barrel insert and piston that provide the mechanism for containing the expanding propellant gases produced on firing. Such...	07/02/2002
6382073	Gas operated shotgun The invention concerns a gas operated shotgun made up of a barrel (11) a cylinder (12) attached to the barrel and a piston (13) moving in the cylinder and along the guide rod (16) between an advanced rest position and an active retracted control position ...	05/07/2002
5872323	Gas operated firearm piston/piston seal assembly A gas sealing device for a gas-operated firearm having a piston with a land surface positioned between a lateral flange and a peripheral rib, and a piston seal radially mounted on the land surface and positioned between the lateral flange and the peripher...	02/16/1999
5429034	Fire arm An improved semi-automatic shotgun of the type contains a magazine tube (8) around which is provided a cylinder (9) whose interior part communicates with an interior part of a barrel (2) of the invention. In this cylinder (9) and around the magazine tube ...	07/04/1995
5388500	Delayed blow-back for firearms Applicant's device improves rapidly firing guns. When such a gun fires, applicant's device delays departure of the gun bolt from the chamber or barrel zone holding a spent round's casing until barrel pressure drops to a safe level. The device has a hollow...	02/14/1995
5325617	System for changing the barrel of a gun or weapon A system for changing the barrel of a firearm includes a firearm that has a stock having a trigger mounted thereon and a housing part removably attached to the stock in a fixed operative position. The housing part has a sighting mechanism on its upper sid...	07/05/1994
5123329	Self-actuating blow forward firearm The present invention comprises a self-actuating blow forward firearm having a fixed breech block located to the rear of the firearm. A cartridge feeder provides a supply of cartridges to the loading area so that the firearm can be used as an automatic or...	06/23/1992
4901623	Compensating device for gas actuated firearms An autoloading shotgun having a receiver, a barrel projecting from the receiver, a magazine tube supported on the receiver in parallel relation to the barrel, a generally cylindrical gas cylinder mounted in fixed position relative to the barrel and coaxia...	02/20/1990
4817496	Firearm A firearm comprises a gas drive for actuating loading and/or firing means in response to the discharge of a round, wherein the gas drive comprises a pneumatic cylinder and a pneumatic piston, the cylinder chamber communicates with the barrel bore through ...	04/04/1989
4562659	Automatic firearm An improved automatic firearm. The firearm comprises a body assembly including a body member, a barrel mounted in said body member, a trigger assembly mounted to said body member proximate to the front end of the barrel, and a magazine guide in the body m...	01/07/1986
4553469	Low-recoil firearm with noncircular guide rod for angularly locating bolt carrier assembly A locked breach, gas operated long action firearm capable of firing heavy caliber shotgun or rifle shells with substantially reduced recoil. The gas piston and bolt carrier assembly are supported for recoil movement along a single guide rod which extends ...	11/19/1985
4505183	Gas actuated operating mechanism for autoloading firearm A semiautomatic shotgun having a gas operating mechanism for unlocking a bolt and moving it from battery position. The operating mechanism includes an action bar and an inertia weight assembly which comprises a plurality of inertia elements. The inertia e...	03/19/1985
4440065	Breech mechanism for automatic firearms A breech mechanism for automatic firearms having a high cadence; and, in particular, a rigidly closing breech mechanism which includes a gas piston effecting the opening thereof and which stands in communication with a sleeve, a coil spring concentrically...	04/03/1984
4395937	Shot gun with gas take-off A shot-gun with gas take-off has a fore end stock which is movable longitudinally of the barrel and lockable selectively in each of two positions: in one position gases from the discharge of a cartridge in the gun bleed from the barrel into the chamber of...	08/02/1983
4389920	Semiautomatic firearm A gas operated system for use in semiautomatic firearms is disclosed. The gas operated system utilizes a gas powered assembly which is actuated by gas under pressure. The gas powered assembly is utilized to provide rearward motion to a drive assembly. The...	06/28/1983
4373423	Gas operated mechanism having automatic pressure regulator A pistol having barrel and a gas operating mechanism coaxially supported on the barrel for axial movement relative thereto and defining an annular gas chamber surrounding an associated portion of the barrel. The gas operating mechanism includes a piston s...	02/15/1983
4279191	Firearms An arrangement in firearms having a barrel and a bolt. The bolt is provided with means mounting the bolt for axial displacement and rotation on the outside of the barrel. A carrier displaceably mounted on the outside of the barrel is operatively connected to t...	07/21/1981
4174654	Gas-sealing means for tubular magazine gas-operated firearm A gas-sealing device for gas-operated firearms of the tubular-magazine type in which a pair of radially flexible piston-rings are provided for sealing the gases within the annular chamber between the gas cylinder and the magazine tube. Each piston-ring is...	11/20/1979
4173170	Police firearm This invention relates to firearms of the type disclosed in my prior U.S. Pat. No. 3,198,077, granted Aug. 3, 1965, in which the bolt does not turn and the action is locked by turning the receiver. The principal parts, such as floating ring receiver pisto...	11/06/1979
4148245	Fluid propellant projectile firing device A projectile firing device utilizing a fluid propellant in which an electronic control responsive to a charging signal, cycling of the bolt in the breechblock to a fully closed position and pressure in the firing chamber below a preset value opens a valve...	04/10/1979
4125054	Mechanism for gas control in an automatic firearm An improvement in gas operated firearms having means for regulating the flow of gas from the barrel of the firearm to the piston which operates the action of the firearm. The improvement is a device which eliminates the necessity of having to change the b...	11/14/1978
4109558	Semi-automatic gun A semi-automatic gun having a gas operated device for actuating a reloading mechanism thereof. The reloading mechanism includes a cartridge magazine which extends parallel to the gun and the actuating device includes an annular piston sliding over the car...	08/29/1978
4102243	Gas regulator for gas operated firearms An improved gas operated firearm utilizing a metering device positioned for regulating the flow of gas from the barrel of the firearm to a piston which operates the action of the firearm. The metering device consists of a metering plug which has an annula...	07/25/1978
4085654	Gas-operated device for activating the reloading mechanism of a gas-operated automatic rifle A gas-operated device for activating the reloading mechanism of an automatic rifle comprising a cylinder housing and a movable piston, both mounted coaxially upon a cartridge store, the whole assembly being affixed below the rifle barrel. Gases from a car...	04/25/1978
4061075	Automatic weapon An automatic weapon with a receiver, a breech block fixedly mounted in the receiver, a barrel reciprocable within the receiver, a spring biasing the barrel, and a gas cylinder chamber externally of the barrel and in communication therewith, whereby upon f...	12/06/1977
4020740	Firearms for selectively continuous and non-continuous operation A firearm adjustable into single-shot, burst and continuous operation modes is described. For operation in one of the non-continuous modes, an indexing device disposed on the rear portion of a first lever in the firearm trigger mechanism is placed into en...	05/03/1977
4020741	Firearms A firearm includes a housing having a detonation chamber and a projectile-discharge barrel. A displaceable piston is mounted at the discharge end of the barrel and is arranged to be acted upon and extended by combustion gases expelled from the barrel. For...	05/03/1977
4019423	Automatic or semi-automatic firearm A stable automatic or semi-automatic firearm having a differential recoil system in which an open bolt has a designed mass and closing velocity to impact and drive a reciprocating barrel forwardly without rebound and remain locked to the barrel during the...	04/26/1977
4014247	Gas-operated shotgun A gas-operated, magazine fed firearm includes a shell carrier for receiving shells from the magazine and lifting them into chambering position. An integral shell stop and carrier latch lever pivotally mounted in the receiver latches the shell carrier in i...	03/29/1977
4010673	Small arm A barrel is fixedly inserted in and protrudes from a grip and comprises a barrel chamber. A piston is provided on the outside of said barrel and rigid therewith. A breechblock comprises a cylinder surrounding said barrel and piston before said grip and de...	03/08/1977
3990347	Firearms having a bolt mounted for longitudinal and rotational movement A firearm includes a housing having a detonation chamber and a projectile-discharge barrel. A displaceable piston is mounted at the discharge end of the barrel and is arranged to be acted upon and extended by combustion gases expelled from the barrel. For...	11/09/1976
3990348	Firearm having a relief valve A firearm such as a semiautomatic rifle having a gas cylinder which receives gas under pressure upon firing of a round in order to move a gas piston which operates components of the firearm. A relief valve structure communicates with the interior of the g...	11/09/1976
3988964	Gas operated firearm with metering adjustment A gas operated firearm capable of at least semi-automatic operation, the firearm including a receiver having a barrel connected thereto, the barrel including a bore with a plurality of radially extending ports through the barrel from the bore. A breach bo...	11/02/1976
3968727	Firearm with gas-operable structure and relief valve A firearm having structure operated by gas pressure, upon firing of a round, as well as a relief valve for responding to excess pressure. A gas cylinder is fixed to a barrel of the firearm, forwardly of a magazine which extends beneath the barrel, this ga...	07/13/1976
3945296	Gas piston in a firearm A piston such as a gas piston of a firearm. The piston includes a substantially rigid cylindrical body having an end region which fluid-tightly and slidably engages one surface while extending from the latter surface toward but terminating short of a seco...	03/23/1976

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Class 89/191.02 - Annular piston