GB248771A - Improvements in or relating to automatic fire-arms - Google Patents

Abstract

248,771. Destree, J. March 7, 1925. [Convention date]. Machine guns.-A long barrel-recoil gun has a barrel and breech-block both of comparatively light weight so that they reach their rear position before the bullet has left the barrel and are held in this position by the back pressure. When the bullet has left the barrel, the barrel and breechblock move forwards a short distance to unlock the breech-block, and the barrel then returns alone to open the breech. As shown in Fig. 1, the breech-block 4 is locked to the barrel 1 by a hook 5 pivoted on the breech-block and engaging a stud 9 on the barrel. Pivoted to the hook is a lever 7 which during the first part of the return movement engages a shoulder 12 on the breech frame, and actuates the locking hook 5. The lever 7 is released from the shoulder, towards the end of the forward movement of the barrel, by a projection 13 on the barrel. In the construction shown in Fig. 2, the barrel 1 and breech-block 4 are connected by toggle links 14, 15 adapted to be broken during the forward movement of the barrel. During the recoil, projecting ends 16 of the middle pivot of the toggle slide through longitudinal slots 19 in side pieces 20. The rear ends of these slots are closed by flaps 21 so that, during the return, the pivot ends 16 ride over the tops of the side pieces 20.