Patent GB-1322527-A (GB)
Title: Bolt assemblies for guns
IPC: F41A19/30
Filed: 1970-10-20
Abstract: 1322527 Bolt assembly GENERAL ELECTRIC CO 20 Oct 1970 [22 Oct 1969] 49728/70 Heading F3C A bolt assembly for a gun having means for reciprocating the bolt assembly to cock, sear and re-set the firing pin, has a main body 44, Fig. 2, a head body 46 and a firing pin 48. The main body 44 is longitudinally movable relative tc the head body 46 and has a longitudinal bore 60, a helical cam surface 62 and a triangular cam slot 64 having a longitudinal surface, a transverse surface and a ramp surface. The head body 46 has a longitudinal bore 72, Fig. 3, a cam follower 70 for the main body cam surface 62 and an L-shaped cam slot 88 having a longitudinal leg 90 and a transverse leg 92. The firing pin 48 has a forward penetrator 108 positioned in the head body bore 72, an aft end positioned in the main body bore 60 and has a longitudinal bore 96, Fig. 4, therein which is open at the aft end. A main spring 50 is mounted in the bore 96 and an aft crosspin 102 is disposed through the main body triangular slot 64 and a firing pin longitudinal slot 98 to abut and capture the main spring 50. A forward cross-pin 106 extends radially from the firing pin and into the slot 88, Fig. 3, of the head body 46 so that, in the feed position, the main body 44 and the head body 46 are at a maximum mutual longitudinal separation and are journaled on the firing pin 48. The aft crosspin 102 is disposed against the longitudinal forward apex of the triangular slot 64, Fig. 2, and the forward crosspin 106 is positioned in the distal end of the transverse leg 92 of the L-shaped slot 88. The main spring 50 is substantially uncompressed so that, in the locked position, the main body 44 and the head body 46 are at a relatively closer mutual longitudinal separation than in the feed position, the head body having been rotated about the firing pin 48. The aft crosspin 102 is positioned against the longitudinal aft apex of the triangular slot 64 and the forward crosspin 106 is positioned in the transverse leg 92 of the L-shaped slot 88 adjacent to the longitudinal leg 90. The main spring 50 is compressed, so that, in the seared position, the main body 44 and the head body 46 are at a minimum mutual longitudinal separation, the head body having been further rotated about the firing pin. The aft crosspin 102 is positioned against the longitudinal aft apex of the triangular slot 64 and the forward crosspin 106 is positioned in the longitudinal leg 90 of the L- shaped slot 88, the main spring 50 being extended and the penetrator 108 of the firing pin 48 being extended forward of the head body. A firing pin resetting means is provided and includes the crosspin 102 which converts relative rotational movement, of the main body to the firing pin, into relative longitudinal movement of said firing pin to the main body. The firing pin resetting means also includes the ramp surface of the main body triangular slot 64. The head body 46 is provided with a forward bolt face 82, extractor lugs 80, and a transversely extending locking lug 87. In an embodiment a multi-barrelled gun as shown in Fig. 1 has six bolt assemblies 28. The gun has a rotor assembly 10 comprising a rotor body 12 having a forward head portion 14 with six ports 16 therein to respectively receive six gun barrels 18 with respective chambers 18C. Six longitudinal ribs 20 project radially from the body 12 between the ports and six track elements 22 are respectively bolted to the ribs 20 by studs 24 and nuts 26. The six bolt assemblies are respectively mounted, between adjacent track elements 22 in alignment with respective barrels 18. A rotor forward gear 30 and a rotor forward bearing 32 are fixed on the forward head portion 14. A rotor aft gear 34 and a rotor aft bearing 36 are fixed to the aft end of the body 12. The rotor assembly 10 is rotatably mounted in the bearings 32, 36 which are supported by a housing H. Each bolt assembly 28 is provided with a cam follower roller 54, Fig. 2, which enters an elliptical cam track 38, Fig. 1, formed in the housing H so that the longitudinal position of each bolt assembly is controlled. A guide bar 40 is attached to the housing H and is provided with fingers which direct cartridges 42 from a feeder assembly (not shown) and also cam spent cartridge cases into an ejection shoot (not shown).