| 摘要 |
<p>In an embodiment, where a locking mechanism is slidably located in breech casing (2) behind barrel (15), comprising a breech block (1, 47, 68), its carrier (6, 66) and a lever, while said breech block (1, 47, 68) comprises particularly a firing pin (28) and ejector of fired cartridge cases (12) reaching into a bed (10) for a bottom (11) of a cartridge case (12) and further longitudinal guiding grooves (3) for guiding bars (4) protruding from sides (5) of breech casing (2) and other longitudinal guiding grooves (7) for guiding bars (8) on carrier (6, 66) of breech block (1, 47, 68) and to a carrier (6, 66), which is under continuous action of return spring (33, 49), is fixed a lever swingable into locked and unlocked positions, said lever being a lever of the third order (18, 38, 54, 55, 62) with shorter leg (22) and longer leg (26), while said shorter leg (22) is at its end towards face wall (9) of breech block (1, 47, 68) provided with at least one arched friction surface (21) and longer leg (26) is opposite to said arched friction surface (21) provided at its end with at least one bearing surface (25), while breech block (1, 47, 68) is adjacent to arched friction surface (21) provided with at least one sliding surface (23) and breech casing (2) is adjacent to bearing surface (25) provided with at least one stop surface (27).</p> |
