| 摘要 |
A breech ring (1) in a firearm, which can be closed and opened with a screw mechanism which comprises a screw (4). The breech ring has conical threads (5) which can coact with corresponding threads on the screw. The threads of both the breech ring and the screw have sectors without threads, arranged so that the screw can be inserted into its final longitudinal displacement position and thereafter turned into coaction with the threads of the breech ring for securing of the screw in the breech ring. In the sectors without threads there are arranged counter-holding plate springs (11a, 11b, and 11c) which in coaction with a stripper achieve a counter-holding and centering function for a bag charge (18) or the like, which has been inserted into the firearm by a ramming unit behind a shell or the like, the position of which in the longitudinal direction is thereafter adjusted during the extraction of the ramming unit from the chamber of the firearm. The respective counter-holding springs then have the form of a plate spring fastened in one end which assumes a position unactuated by the screw with the aid of its own spring action, and a position actuated by the screw when it is pressed down into the sector without threads. |
