loader. Barrel has T-shaped ribs adapted to slide in T-shaped groove in slide mounted to move longitudinally on housing and to be released from engagement therewith when said slide is drawn rearward to a predetermined position. Means for normally locking barrel on housing. Improved safety features.

Patent 1,039,922 1 Oct 1912

Frommer, Rudolf Budapest, A.-H.

Self-loading pistol of the kind having sliding barrels.

The two springs which return the barrel and the breechblock respectively into firing position are arranged above barrel concentrically to one another in such a manner that each of the two springs may have a length approximately equal to that of the weapon. Total length of the weapon can thus be made comparatively short, while springs can be made sufficiently long to fulfill their functions.

Patent 1,047,671 17 Dec 1912

Mauser, Paul Oberndorf, Gcr.

Recoil-loading pistol with fixed barrel.

Novel fastening device for barrel is provided in which barrel is held by a barrel holding device in the form of an inscrtablc pin, after the removal of which the barrel can be readily detached from grip stock. New arrangement of trigger mcchanism with scar provided above the magazine in upper part of grip stock and consisting of double-armed bell crank lever. Arrangement for locking breech slide in event of single loading.

Patent 1,217,974 6 Mar 1917

Mauser, Paul (deceased)


Relates to breech arrangement for firearms with return spring. Spring arranged in lid of breech casing so that it is removed together with lid when latter is taken off.

Patent 1,234,783 31 Jul 1917

Mauser, Paul (deceased)

Means for combining the barrel with the receiver in connection with firearms.

Renders barrel readily interchangeable. More easily possible to extract discharged shells without aid of a lubricant. Intermediate piece inserted between barrel proper and sleeve head of receiver. This piccc contains cartridge chamber as well as locking abutment separately and extends into sleeve head on one hand and receives rear end of barrel on other.

Patent 1,242,068 2 Oct 1917

Stoddard, Vaughn Chelsea, Iowa

Machine gun.

Embodies rota table barrel having an annular series of rifle bores, an endless feed chain for conveying shells to and partially around with the barrel and means for moving the shells from the chain into said bores for firing and then withdrawing shells from said bores while shells arc being carried around with barrel.

Patent 1,307,316 17 Jun 1919

O'Mallcy, John F. Mcriden, Conn.


Machine gun provided with a double reversible barrel which may be adjusted to permit one barrel to cool while the other harrcl is in use; rapidity of fire may he regulated by adjustment of gears which connect operating member with loading and firing mechanism. Hammer operated by cartridge wheel and both arc covered by a cap readily removable.

Patent 1,329,922 3 Feb 1920


Permits use of interchangeable gun-barrels, one of which is water-cooled, the second is double, reversible and air-cooled and third is a single air-cooled barrel. Provides perfect balance in rotating cartridge wheel and permits operating crank shaft from one side of gun instead of underneath.

Patent 1,363,262 28 Dec 1920

North, Thomas K. Swaffharn, Eng.

Rifle and machine-gun.

Provides for replacement of one barrel by another in gas-operated machine guns and rifles. By displacing locking dcvice in form of transversely arranged pin rotatably mounted in body of gun.

18 Sep 1923 Westminster, Eng.

Patent 1,168,262 Dawson, Arthur T. and others Automatic gun.

Maxim modification. Improved means for manually retracting barrel so as to simplify the loading operation.

Patent 1,588,887 15 Jun 1926

Hanhroe, Werner C. L. Copenhagen, Denmark

Machine gun with exchangeable barrel.

Shapes the bolt serving to hold the trigger plate and butt end in normal position in such a manner that it has to be turned only a half revolution to release swinging parts and same in opposite direction to lock parts in normal position. Simplifies removal of bolt and prevents danger of loss of bolt.

Patent 1,738,500 3 Dec 1929

Moore, Frederick T. E. Hartford, Conn.

Barrel mounting for firearms.

Improvement on Browning machine gun (Patent 1,293,021 —1919). Provides barrel mounting permitting barrel to be readily assembled with, or disassembled from, barrel extension to facilitate replacement of barrels in service.

Patent 1,758,486 13 May 1930

Frommer, Rudolf v. Budapest, Hungary

Automatic firearm.

To provide an automatic arm having an air-coolcd barrel sliding on a long way in the chamber of which the shell is loosened by a shock produced by a spring buffer against which the barrel strikes, the barrel of which can be changed in a few seconds under the most unfavorable conditions. All parts of weapon which would influence this quick change arranged to be easily removable from path of barrel.

Patent 1,789,308 20 Jan 1931

Hatcher, James L. Winchester, Va.

Apparatus for rifling gun barrels.

Rifled by a cold work operation which will not only permit simultaneous formation of the rifling in a number of barrels but will serve to raise the elastic limit of the metal.

Patent 1,821,463 1 Sep 1931

Danthine, Karl Bern, Switzerland

Machine gun.

Improvements in reciprocating barrels of machine guns such as Maxim. Barrel made in two pieces so that actual barrel with cartridge chamber consists of one part, this part being inserted into back portion or guide and interchangeably connected thereto. Simplifies replacement.

Patent 1,852,057 5 Apr 1932

Moore, Frederick T. and Pfeiffer, Christian Hartford, Conn. Spring mechanism for automatic firearms. Improvement in Browning patents to provide a spring mechanism for restoring mechanism to its normal firing position after recoil. Reaction spring for reciprocating lock frame located at front of gun. Provides additional space within brcech casing, guide tube for reaction spring to prevent buckling, and tension of spring is varied as result of barrel movement.

Patent 1,877,839 20 Sep 1932

Frommer, Rudolf v. Budapest, Hungary

Barrel spring for automatic firearms.

Improved construction of barrel spring in arms having straight pull breech and a barrel with long recoil movement. Buffer sleeve adapted to surround barrel spring and at same time guiding rod of barrel spring is provided with a flange on which said buffer spring bears.

Patent 1,980,399 13 Nov 1934

Gun barrel and barrel mounting. (CI. 89-1) Constructs barrel and its mounting so that the packing will be better protected against the heat of the barrel and the rifled muzzle end of the barrel will be available to the cooling medium in the jacket during reciprocation. Provides reserve water space in mounting in front of muzzle end of barrel.

Patent 1,987,939 15 Jan 1935

Lahti, Aimo J. Jyvaskyla, Finland

Recoil-operated machine gun with much smaller number of parts. Possible, solely by changing the magazine support, to use both straight and cylindrical magazines and, if barrel is changed, to fire with cartridges of various calibers. Barrel and sliding device are rigidly connected and move a. short distance to and fro.

Patent 1,991,302 12 Feb 1935

Frommer, Rudolf v. Budapest, Hungary

Automatic firearm with a movable barrel. (CI. 42-4) Fixes barrel automatically when opening the breech block manually by swingable handle, so that the breech block is opened on withdrawal of cartridge case out of chamber.

Patent 1,994,489 19 Mar 1935

Simpson, Clarence F.. Springfield, Mass.

In Browning guns, provision of externally accessible latch for holding barrel in position of adjustment, to permit more convenient and more rapid adjustment for head-space.

Patent 2,031,383 18 Feb 1936

Mendoza, Rafael Mexico City, Mex.

Machine gun bolt mechanism. (CI. 89—3) Improved means for releasably securing the gun barrel to the case or frame of a gun which will effectively prevent relative movements between said parts.

Patent 2,061,313 17 Nov 1936

Moore, Frederick T. W. Hartford, Conn.

Machine gun and attachment therefor. (CI. 89-14) Relates to air-cooled machine gun with readily detachable barrel. Attachment to rotate barrel to screw it into and out of engagement with barrel extension and also adapted to carry barrel when detached from gun.

Patent 2,093,706 21 Sep 1937

Browning, Marriner A. Ogden, Utah

Gas operated automatic firearm. (CI. 89-2)

Relates to gas-opera ted firearm having piston tube normally connected with barrel and readily movable rearward to disengage barrel. Permits barrel to be disconnected from casing of gun.

Patent 2,110,165 8 Mar 1938

Moore, Frederick T. W. Hartford, Conn,

To provide a machine gun of the reciprocating barrel type, wherein the barrel may be readily put in place or removed from front of gun without disturbing or disassembling any other essential part. Permits easy substitution for heated barrel. Has barrel guiding bearing on the guide which is readily detachable to permit forward removal of barrel.

Patent 2,223,004 26 Nov 1940

Holek, Vaclav Brunn, Czechoslovakia

Automatic firearm. (Cl. 42-4)

Firearm comprising a casing, a recoiling barrel, breech mechanism, an aperture in casing, an openable closure for aperture, and means connecting closure and barrel. Receiver has cover having a plunger arranged to cock barrel when lifted and closed.

Patent 2,326,139 10 Aug 1943

Gun barrel mounting. (Cl. 89-14)

Improved mounting for moving gun barrels, especially where muzzle end is provided with a recoil check and accelerator. Provides broaching action of such character that relatively large particles of carbon or other residue cannot form and cause ignition of the gas in the booster chamber.

Patent 2,345,596 4 Apr 1944

Barrel mounting. (Cl. 89-14)

Means for mounting muzzle and portion of barrel of an automatic gun so that travel of gases between barrel and blast tube rearwardly is positively precluded. Utilized flow of gases under high velocity from muzzle to withdraw gases accumulating rearwardly of muzzle between barrel and blast tube similar to manner in which an injector functions. Frequent dismounting for cleaning obviated.

Patent 2,345,833 4 Apr 1944

Schirokauer, Henry New York, N. Y.

Relates to mechanism for locking gun barrel in the gun frame, so that when in use barrel is more or less rigidly locked in place in frame to be more or less immovable and meet stress caused by firing of the gun. Locking member provided with a seat for engaging barrel, preferably an arc-shaped tapered engagement providing a large surface contact.

Patent 2,360,293 10 Oct 1944

Webb, George Hartford, Conn.

Barrel lock for automatic firearms. (Cl. 89-3)

Improved barrel lock for Browning machine gun. Readily re leasable lock for preventing rotatable movement of firearm barrel or tube with respect to breech casing and barrel extension of firearm. Barrel and extension reciprocate as a unit during operation of gun but rotation of barrel is normally prevented by a detent moving bodily with barrel and extension. By this invention detent can be released to permit rotation of barrel.

Patent 2,364,487 5 Dee 1044

Swartz, William I,. W. Hartford, Conn.

Firearm accessory. (CI. 42-90)

Accessory for holding a barrel extension in its normal proper position within brccch casing of an automatic firearm while barrel or tube is being attached to or detached from engagement with barrel extension. Applicable to Browning weapons.

Patent 2,406,089 20 Aug 1946

Martineau, Joseph A. E. Pendicton, Canada

Provision of a gun that spins the bullet without rifling in the bore. Gun barrel is rotated by means of a turbine rotor attached to the barrel and driven by the gas liberated on explosion of the cartridge. Turbine built around magazine. Successive shots increase angular velocity of barrel and hence of spinning.

Patent 2,437,137 2 Mar 1948

5webilius, Carl G. Hamden. Conn.

Relates to quick-change mountings for barrels of small arms and machine guns. Provides barrel lock that will stand up under field service and long wear and usage.

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