Patent Abstracts

This appendix contains a comprehensive collection of U. S. patents that are pertinent to the field of automatic weapons. The arrangement is by subject with the patents listed under each subject in chronological order. For each patent an abstract describing the principal features and claim«? of the invention is given. This abstract is phrased in the terminology of the patent; thus the summaries of some of the earlier patents may contain expressions that vary from current ordnance usage.

No effort has been made at complete analysis of the patents. Coverage of all the claims made by the inventors would make this appendix prohibitively long and would serve no useful purpose. An attempt has been made merely to select the central ideas as set forth in the patents.

Readers are cautioned that inventors are protected by patent regulations with respect to the ideas and claims described in these abstracts unless such protection has lapsed after the statutory period of 17 years for any particular patent. Any utilization of patents not in the public domain mast be in accordance with outstanding rights affecting the invention.

Barrels and Related Mechanisms

Patent 198,366 18 Dec 1877

Farrington, DeWitt C. Lowell, Mass.

Improvement in harrel-shifting mechanisms for machine guns.

Means for shifting barrels as they become heated; also means for supporting barrels whereby they will have the requisite longitudinal play, to compensate for any extension produced by high temperature, without disturbing their parallelism. Easily removable barrels.

Patent 300,515 17 Jun 1884

Schneider, Alois San Francisco, Calif.

Rifling guns.

Rifling consists of channels or grooves by which rotary motion is imparted to ball, the first portions of which from the breech are nearly or quite parallel to axis of bore. Grooves then turn slightly to right before commencing the twist to the left. Latter is an increasing or gain twist to a point within an inch or two of muzzle or outer end, from which the twist is continued out with an even or regular turn.

Patent 632,094 29 Aug 1899

Browning, John M. Ogdcn, Utah


Improvement in bolt-guns in which bolt is located in bolt-housing formed in a rearward extension of barrel itself. Barrel may be readily removed from stock without use of tools for compact transportation. Barrel formed at its butt end with an integral receiver extension comprising a tubular bolt-housing formed with a longitudinal slot and a reach formed with a downwardly-opening longitudinal slot extending downward below axial center of barrel.

Patent 687,130 19 Nov 1901

Automatic or other machine-gun.

Applicable to guns with sliding barrels and water jacket, as in Maxim 37-mm gun. Object to construct gun so that barrel and water jacket can be readily and simultaneously dctachcd for convcnicncc in transporting the gun. Projections on barrel fit into corresponding grooves in frame. Also grooves in jacket to correspond with ribs in breech casing.

Patent 918,380 13 Apr 1909

Schwarzlose, Andreas W. Berlin, Ger.

Automatic firearm with forward-sliding barrel.

Increases weight of barrel and provides same with a chamber in which the usual spring is seated and that portion of the casing which usually surrounds the barrel and extends to muzzle end thereof is almost wholly dispensed with. Novel arrangement of usual abutting or breech wall against which barrel strikes, with respect to discharge end of magazine so as to avoid use of cartridge retaining mechanism.

Patent 988,996 11 Apr 1911

Frommer, Rudolf Budapest, A-H

Automatic firearm.

Relates to automatic firearms with sliding barrels in which barrel can be fixed for use as a handloaded weapon and to facilitate cleaning of barrel. Fixing device consists in fixing barrel by means of a sleeve arranged on guide tube of the barrel, which sleeve is adapted to rotate and be secured in its operative positions.

Patent 989,432 11 Apr 1911

Schmeisser, Louis Erfurt, Ger.

Automatic firearm.

An improvement in automatic firearms with stationary barrels. To provide a firearm of this class in which parts which must be dismounted for thorough cleaning can easily be mounted or dismounted by hand. Provides slidable or otherwise movable locking bar at upper part of firearm which enables the barrel to be easily secured or dismounted.

Patent 1,028,032 28 May 1912

Krag, Ole H. J. Ullcrn, Norway

Automatic repeating firearm.

Improved repeating pistol (Patent 954,441 —1910) that can be discharged as an automatic or operated as single

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