Patent GB-191505940-A (GB)
Title: Improvements in Automatic Small Arms.
Inventor: ENEVER EDWIN ALEXANDER
IPC: F41A9/41
Filed: 1915-04-20
Abstract: 5940. Enever, E. A., and Chevallier, A. L. April 20. [Cognate Application, 16,343.] Breech actions, sliding barrel and breech-block ; cooling barrels.-Relates to guns operated by an inertia-weight, as described in Specification 16,175/12, and consists mainly in mounting the barrel and breech-body to recoil relatively to the breech-frame, magazine, and trigger mechanism. The invention also comprises detail improvements in the means for connecting the parts together and in the means for controlling the movements of the weight. A cooling-jacket, firing-mechanism, and means to prevent the top cartridge from rising too quickly are also described. The parts are so arranged that the ratio between the movement of the barrel and the forward movement of the weight relatively to the barrel is between two to one and unity. The barrel B is supported by two rings B<1>, B<2>, Fig. 1<a>, and has a depending lug C', Fig. 1, fitting into a cylindrical recess which contains the run-out spring J and a buffer spring C<3>, Fig. 1<a>. A plunger K, Fig. 2, is adapted to engage a recess in the lug C<2> to lock the barrel to the frame for non-automatic use. The body D has on its underside a T-shaped rib D', Figs. 1 and 21, adapted to slide in a corresponding groove on the top of the frame A. In a modification, the barrel is supported by a cooling-jacket W, Figs. 5<a> and 5<B>, the muzzle being supported by a cap W<3> having ribs W<4> which fit into slots at the forward end of the jacket. The jacket is mounted to turn on a transverse hinge W<2>, Fig. 5<a>. When the gun is ready for firing, the weight E, Fig. 5<a>, is locked to the frame by a lever M pivoted to the fra'me A and engaging a recess M<3> in the weight. This lever is depressed, to release the weight, during the recoil of the barrel, by a stud M<4> on the barrel extension C engaging an incline M<5> on the lever. A shield X, Fig. 5<a>, is provided to prevent the hand from being trapped between the weight and the barrel. The breech-closing spring N, Figs. 15 and 21, is mounted in a boring in the breech-body D, and at the front bears on a slide N<2> having a projection N<3> adapted to engage a depending arm of the bolt-carrier. In a modified form of the attachment between the spring and the carrier, Fig. 19, a cranked lever O pivoted to the carrier L<1> has a projecting arm O<2> adapted to enter a recess O<3> in the forward sliding abutment of the spring. The sear consists of a ring R<3>, Figs. 1 and 3, mounted in the weight and embracing the firing-pin R<2>. The sear is raised to release the firing-pin by a plunger T actuated by a lever T and the trigger S. The trigger engages the lever T by means of a spring pawl S<3>. To prevent the top cartridge from rising too quickly, the underside of the carrier L' is provided with a rib V<1>, Figs. 1 and 19, and in the breech-body D at the side of the magazine opening is an inclined plate V<2>, Figs. 22 and 24, pressed outwards by a spring V<3>. An auxiliary run-out spring P<1>, Fig. 21, and recoil buffer P, Fig. 15, may be provided in the side of the breech-body D.