Shoulder arm with swivel breech member

In a shoulder arm, especially a rifle, having a barrel, a recess, extending perpendicular to the axis of said barrel, formed in a member which is fixedly connected with said barrel, and a roller-shaped breech member coaxially arranged in said recess and capable of being swivelled about its longitudinal axis for loading, said breech member containing a firing chamber which is designed symmetrically to a transverse center plane and is capable of assuming two firing positions separated from one another by a 180.degree. rotation of said breech member and which, in each said firing position of said breech member, is in alignment with said barrel and is closed to the rear, and further having an arrangement for swivelling said breech member out of said firing positions and into a loading position in which said firing chamber is accessible for the introduction of a cartridge;

• and wherein said recess is designed in the form of a cylindrical hole whose wall serves to mount said roller-shaped breech member and to directly close said firing chamber when it is located in said firing position, said breech member is retained in its respective position by means of said swivelling arrangement, and said breech member can only be rotated in one direction by said swivel arrangement;
• the improvement wherein an ejector and a magazine are arranged on the same side of the weapon, above said barrel, and in an operative position with said firing chamber when it is in said loading position;
• and wherein said swivel arrangement includes:
• a Geneva movement provided at at least one end surface of said breech member, said Geneva movement comprising four radial slots formed in the end surface of said breech member and in which the pins of a cam engage with said pins being arranged in a projecting manner on one end of said cam;
• and gas power operated drive means for rotating said cam 360.degree. during one firing cycle, said gas power operated drive means including a gas piston which actuates a control slide against the force of a spring, said control slide having two toothings which engage alternately with corresponding projections in said cam during the forward and rearward travel of said control slide, thereby swivelling said cam 180.degree. in each case.

In a shoulder arm, especially a rifle, having a barrel, a recess, extending perpendicular to the axis of said barrel, formed in a member which is fixedly connected with said barrel, and a roller-shaped breech member coaxially arranged in said recess and capable of being swivelled about its longitudinal axis for loading, said breech member containing a firing chamber which is designed symmetrically to a transverse center plane and is capable of assuming two firing positions separated from one another by a 180.degree. rotation of said breech member and which, in each said firing position of said breech member, is in alignment with said barrel and is closed to the rear, and further having an arrangement for swivelling said breech member out of said firing positions and into a loading position in which said firing chamber is accessible for the introduction of a cartridge;

• and wherein said recess is designed in the form of a cylindrical hole whose well serves to mount said roller-shaped breech member and to directly close said firing chamber when it is located in said firing position, said breech member is retained in its respective position by means of said swivelling arrangement, and said breech member can only be rotated in one direction by said swivel arrangement;
• the improvement wherein an ejector and a magazine are arranged on the same side of the weapon, above said barrel, and in an operative position with said firing chamber when it is in said loading position;
• wherein any cartridge remaining in said firing chamber when it is in said loading position will be ejected from said firing chamber by the next cartridge fed to said firing chamber from said magazine;
• and further comprising means for mounting said ejector relative to said magazine so that said ejector is operable to enter said firing chamber when it is in said loading position to eject a cartridge only if no cartridge is available for loading into said firing chamber.