To all whom it may concern: Be it known that I, John M. BROWNING, a citizen of the United States, residing at Ogden, in the county of Weber and State of Utah, have invented a new and useful Improvement in Firearms, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof. This invention relates to improvements in magazine firearms, and more especially to automatic firearms and particularly to automatic pistols in which energy is stored during the opening movement of the breech-slide in a spring, the reaction of which is utilized to actuate the return or closing movement of the breech-slide.
The main object of the invention is to produce a firearm of this class which shall be simple and inexpensive in construction, reliable, and safe under all conditions of use. Another object of the invention is to produce an automatic pistol specially adapted for accurate target practice, by haying the handle or grip of the pistol formed to be securely grasped and conveniently held in aiming and firing, and in which the frame of the arm shall support the comparatively long barrel rigidly, and in which the breech-slide may be at will and readily detached and removed from the frame, and be replaced and attached upon the same without requiring the use of any tool therefor. A further object of the invention is to provide the firearm with an automatic safety device for positively preventing the firing of the arm unless the breech is closed and all parts are in the proper firing position, and by the same device to always prevent 1 more than one shot from following upon each pull of the trigger.
A further object is to provide the arm with a manual safety lock for at will and simultaneously locking the breech-slide and the cocked firing mechanism, and by this same device to provide the arm with a reliable indicator for showing at a. glance or touch whether the firing mechanism is in the cocked or in the released position. 1 These objects are attained by mechanism of simple and practical construction which is efficient, perfectly safe in use, and not liable to get out of order. The invention is shown herein as embodied in a gas-operated magazine pistol; but it will be understood that the invention is applicable to other firearms. In the accompanying drawings, wherein is illustrated an embodiment of the invention, Figure 1 is a left-hand side view of a central vertical section through the frame and the rear portion of the barrel with the breech closed and ready for firing; but showing the breech-slide in a vertical section in a plane somewhat to the left side of its central axis, thereby exposing to view the reaction spring and its guide for storing the energy of the recoil on firing a shot, and showing the manner in which the two ends of the reaction spring are supported, the front end in the breech-bolt and the rear end by the butt piece of the grip or mainspring housing. Fig. 2 is a left-hand side view of the upper portion of the frame of the pistol and of the breech-slide in the closed position. Fig. 3 is a central longitudinal section of the breech-slide, showing the firing pin with its retracting spring and locking pin in the breech-bolt.
Fig. 4 is a bottom view of the breech-slide. Fig. 5 is a vertical transverse section of the breech-bolt near its forward end looking forward, showing also an upper portion of the cartridge magazine. Fig. 6 is a vertical transverse section of the breech-slide in rear of the breech-bolt, indicating the respective positions of the firing pin and of the reaction spring and its guide rod, the spring and rod being shown in Figs. 4 and 6 as held in their forward compressed position by a transverse pin. Fig. 7 is a horizontal section through the forward portion of the frame below the barrel, showing a top view of the trigger and showing the trigger spring, its piston and its fastening plug. Fig. 8 is a partial vertical section of the frame showing the trigger in its place and above it the trigger spring, its piston and fastening plug. i Fig. 9 is a vertical transverse section of a portion of the frame, showing the hub and the pivot of the trigger, and the side plate, seen from the front. Fig. 10 shows the trigger pivot detached, in an end…view and in a top view. Fig. 11 Shows the trigger bar in a left hand side view and in an under side view.