GB240880A - Improvements in automatic fire arms - Google Patents

Abstract

240,880. Kiraly, P. von, Lovasz, J., and Schweizerische Industrie Ges. Oct. 6, 1924, [Convention date]. Breech actions, sliding barrel and breech-block. -A gun of the short barrel-recoil type has a boltactuating slide adapted to be retracted relatively to the barrel and breech-bolt by a lever operated by impact towards the end of the recoil of the barrel. As shown in Fig. 1, the bolt-actuating slide 7 is driven back by a lever 26 pivoted on the barrel 1 and adapted to strike a fixed abutment 29. The slide has two inclined surfaces 8, 9, Fig. 6, engaging a stud 10 on the bolt 5 to effect the locking and unlocking rotations. The surfaces are spaced apart so that there is lost motion before the unlocking rotation begins. The end of the unlocking surface 9 is curved to form a recess 12 whereby, after the unlocking movement, a direct blow is given to the bolt, which then recoils freely to open the breech. The slide 7 is held in the rear position until the recoil movement of the bolt is completed by a catch 15 having a tooth 17 adapted to engage a notch 19 in the slide. The catch is released by the bolt 5 engaging a projection 18. When the slide 7 is in the forward position, the catch rises and a bevelled front surface thereon engages the slide, as shown in Fig. 1, and tends to hold it against accidental actuation. When depressed, the catch acts, by an inclined projection 22, on a sliding tooth 23 on the trigger and disengages it from the sear 24, thus acting as an interrupter to ensure single shots and as a safety device to prevent firing until the breech is completely locked. In a modification, Fig. 7, the lever 30 for actuating the slide 7 is pivoted on the fixed casing 3 and is actuated by a shoulder 31 on the barrel. In other modifications, the lever is pivoted on the breech-bolt or on the slide. The Specification as open to inspection under Sect. 91 (3) (a) comprises also (a) a construction in which, to reduce friction during the unlocking, the surface 9 on the slide is formed, as shown in Fig, 8, with a graduadly increasing inclination ; (b) modifications in which the gun has a tilting breech-block, as shown in Figs. 9 or 10. In the form shown in Fig. 9, the unlocking of the breech-block 5 is effected by a lug 12 on the slide striking an unlocking lever R on the block, and the locking is effected by an inclined surface 8 on the slide engaging a corresponding surface on the block. In the construction shown in Fig. 10. the locking and unlocking oscillat:ions of the block 5 are effected bv a projection 8 on the slide 7 engaging projections 12 on the underside of the block; and (c) proportioning the weights of the parts so that the ratio of the weights of the bolt and the slide is 1 : 1.5 to 1.4, and the ratio of the weight of the slide to the weight of the rest of the gun is between 1 : 10 and 1 : 20. This subject-matter does not appear in the Specification as accepted.