Patent GB-1485322-A (GB)
Title: Shoulder arm
IPC: F41A3/74
Filed: 1975-03-13
Abstract: 1485322 A hand-supported weapon HECKLER & KOCH GmbH 13 March 1975 [21 March 1974] 10527/75 Heading F3C A hand-supported weapon has a breech member 4 which is rotatably mounted about an axis, which is perpendicular to the longitudinal axis of the barrel, so as to allow loading, the breech member 4 containing a firing chamber which, when in its firing position, is in alignment with said barrel and is closed at its rear end and the breech member being provided with rotating means. The breech member 4 is roller-shaped and is mounted in a hole 3 in a member 2 which is attached to the barrel. In an embodiment an automatic rifle for firing caseless cartridges 32 has the firing chamber aligned with the bore 5 of the barrel 1. A front section 6 of the firing chamber receives the tip of a bullet 7 projecting from a body 8 of a caseless cartridge inserted in a part 9 of the firing chamber. The body 8 has also a section 10 with a sealing sleeve 11 therein having a flange 12 which engages the wall of the member 2. A firing pin 21 is provided in a hole 22 which is perpendicular to the firing chamber, is in alignment with a primary compound 23, and has a head 24 which is urged by a spring 25 to effect sealing. The cartridge is ignited by a hammer 26 via a trigger mechanism 27 and a trigger 28. The breech member 4 is rotated 90 degrees into a loading position by a slide 41 so that its rear end faces a magazine 31 containing cartridges 32 which are positioned perpendicular to the direction of fire. The slide 41 is actuated by gas pressure via a rod 42 and has a control slot 43 engaged by an eccentric stub 44 carried by the breech member 4. The slot 43 has end sections 45, 46 and a V-shaped portion 47. The stub 44 is in the section 45 of the slot 43 and, when a shot is fired and the slide 41 is moved rearwardly, is struck by a projection 48 of the slot 43 and anti-clockwise rotation of the breech member 4 commences. When the stub has passed through the V-portion 47 and into the section 46 of the slot 43, the breech member 4 has moved through 90 degrees to the loading position. A loading-lever 51 has a stud 54 which is slidably mounted in a slot 52 in a stationary member 53 and is urged by a spring 62. The stub 54 contacts the rear end of the slot 52 and a shoulder 55 at one end of the lever 51 is positioned behind a forwardmost cartridge 34. The other end of the lever 51 has an arm 56 engaging a straight section 58 of a cam 57, the latter being an extension of the slide 41. Rearward movement of the slide 41 causes the arm 56 to ride along a surface 60 of a nose 59 of the cam 57 and causes the stud 54 to contact the front end of the slot 52. This effects clockwise movement of the lever 51 so that the shoulder 55 thereof can transfer the forwardmost cartridge 34 from the magazine 31 to the breech member 4. The movement of the slide 41 also actuates a shot-counter 71 and cocks a hammer 26 of the trigger mechanism. When the breech member 4 has rotated 45 degrees it is in alignment with a passage 81 through which a defective cartridge can be ejected using a rod, a recess 85 being provided in the member 2 to receive said rod.