To all whom it may concern: Be it known that I, JOHN M. BROWNING, residing at Ogden, in the county of Weber and State of Utah, have invented certain new and useful Improvements in Firearms, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof. This invention relates generally to automatic breech loading firearms, and more especially to firearms of this description in which the several operations—such as the opening of the breech after firing a shot, the ejection of the empty cartridge shell, the cocking of is the hammer, the presentation and introduction of a fresh cartridge into the chamber of the barrel, and the closing of the breech—are automatically effected by the pressure in the barrel of the gases generated by the explosion of the cartridge.
My invention comprises, further, improvements in firearms of the class described in United States Patent No. 580,926, applied for by me and granted April 20, 1897, said patent containing some of the features of the complete firearm which I have illustrated and described herein for the purpose of enabling my present invention to be understood. Such features as are common to the two constructions will be referred to herein so far as may be necessary to ‘enable the present invention to be understood; but the description which follows will relate particularly to the novel features of this case. The main object which I have had in view has been the production of a firearm of the class referred to which should be simple and inexpensive in construction, not liable to get out of order, and reliable and safe in operation under all conditions of use. I have hereinafter shown and described my present improvements as adapted to a gas operated magazine pistol; but I have chosen this particular kind of firearm merely as a convenient illustration of an embodiment of my invention and do not intend to restrict my invention to an application thereof to a magazine pistol nor to any particular kind of firearm, nor do I intend to restrict the invention to the use of the several features of improvement together in a common structure.
In the accompanying drawings, in which I have illustrated an embodiment of my invention, Figure 1 is a left hand side elevation of the pistol with the breech closed. Figs. 2 and 3 are respectively rear and front end views of the same. Fig. 4 is a longitudinal section, on a vertical plane, with the breech closed. Fig. 5 is a longitudinal section, on a vertical plane, with the breech open. Figs. 6, 7, 8, and 9 are detail views of parts to be referred to. Fig. l is a horizontal section on the plane indicated by the line a b of Fig. 1. Fig. 1b is a horizontal section on the plane indicated by the line c d of Fig. 1. The pistol represented in the accompanying drawings comprises a frame a, a barrel b, fixed in the frame, and a sliding breech piece c. The upper portion of the frame a forms the receiver and has a seat and suitable guides for the reciprocating breech piece, and below the receiver is the grip or handle a’, which is preferably made integral with the frame, but obviously may be formed separately and attached thereto in any suitable manner. Within the grip and extending through the same upward into the receiver is arranged a seat or chamber for the reception of the cartridge magazine d. The latter is substantially of ordinary form and construction and may consist of a sheet metal tube, in which the cartridges are laid one upon another, resting upon a spring follower, by which they are pushed upward into the receiver: It is conveniently retained in place within the grip by a spring actuated latch d’. Its upper end is open to permit the escape of the cartridges, the side walls at the rear of the opening being turned in to engage the rim or flange of the topmost cartridge and prevent the escape of the same from the holder except when it is pushed forward, as hereinafter described. The barrel b is secured to the receiver in any usual or suitable manner and extends forwardly from the same to the desired length. The upper portion of the frame is provided interiorly with longitudinal ribs and grooves as a4, Fig. 2, to engage corresponding ribs and grooves each of the breech piece c or of that portion of it which may be more properly coo designated as the ” breech bolt,” the said breech bolt or breech piece being thereby held to the frame and guided thereon in its reciprocation.