Patent GB-1353342-A (GB)
Title: Hand firearms
IPC: F42B5/02
Filed: 1971-05-03
Abstract: 1353342 Small arms H-L SCHIRNEKER 3 May 1971 [2 May 1970 7 Jan 1971] 12807/71 Heading F3C A hand firearm with an optical sighting mechanism for direct or indirect sighting and hence for direct or indirect shooting has a shoulder support 5, Fig. 1, which is pivotally mounted at 15 on a stock 1 and is lockable in shooting positions 5a, 5b and in a carrying position 5c. The sighting mechanism comprises a mirror 16 which is fixed to the stock 1 and a mirror 17 which is adjustably mounted on the stock 1. Direct sighting is effected by means of a sight tube 13, carried by a housing 7 and having a bead 12 therein, and a notch 14 formed in the stock 1, the mirror 17 being moved to the vertical position shown in chain lines. When indirect sighting is required, the mirror 17 is adjusted so that an eye of a marksman can see the bead 12 and notch 14 via the mirrors 16, 17. The barrel 6 of the firearm has a radial bore 30, Fig. 4a, which communicates with a cylinder 31 containing a piston 32 displaceable against a spring for automatic repeating, the piston 32 moving both axially and rotationally. A rod 35 of the piston 32 extends axially parallel to the barrel 6 towards a lock 38, Fig. 4b. The latter has a cartridge roller 25 which is rotatable in steps and which is provided with longitudinally extending grooves 28, Fig. 3, for accommodating cartridges 23, and a firing pin 43 which is released and cocked by the piston-rod 35. The cartridge roller positions the cartridges 23 for firing and is retained in the firing position by a sliding wedge 58, Fig. 4b, which is carried by a rectilinear-motion roller bearing 62. The wedge 58 is actuated by the cocking mechanism of the firing pin 43. The cartridge roller 25 is moved in steps through a ratchet coupling when the piston-rod 35 is moved rearwards under gas pressure as a result of a shot being fired. This movement can be effected by a handle 3, Fig. 1, to cock the lock 38. A piston 42, Fig. 4b, of the firing pin is returned against springs 46, 47 and has a pivotal latch 48 which in the cocked position of the firing pin 43 engages behind a locking plate 30 the latter being actuated by a cam 51 carried by the slide 40. The locking plate 50 has a plunger 54 which is vertically displaceable by a trigger guard 53, and in conjunction with a pivotal pin 55 lifts the latch 48 of the firing pin 43 above the locking plate 50. For continuous firing, the plunger 54 raises the hook 52 of the engaged latch 48 a distance which is equal to the distance by which the locking plate 50 is displaced downwards after each cocking operation. A housing 2 is positioned adjacent the cartridge roller 25 so as to accommodate a replaceable cartridge box 18, Fig. 3, for cartridges 23 arranged in a row on a belt 24, Fig. 8. The housing 2 is closed on both sides and is provided with a flap 19, Fig. 3, and an ejection opening 29 for used cartridges 23. The flap 19 carries a spring 27 which rests against the cartridge roller 25 and the latter is positioned in a holder 26 having a shearing edge which separates used cartridges 23 from a belt 24, Fig. 8. Sporadic firing is effected by locking the cartridge roller 25 at predetermined positions of rotation. A repeating roller 304, Fig. 16, is provided which accommodates a number of cartridges 353 with a uniform cross-section over their entire length and a repeating piston 322 which is displaceable by gases given off during firing and on which there is provided a plunger 324 which pushes cartridges 353 individually from a magazine 328 into the repeating roller 304 and ejects a used cartridge from the repeating roller. The repeating roller 304 may have helically extending grooves 342 for engagement by a carrier pin 345 which is axially displaceable by the repeating piston 322 to stepwise rotate the repeating roller. The repeating piston 322 is in a cylindrical housing 310, Fig. 14, having a silencer 316, therein, is displaceable axially rearwards against a compression spring 323 and comprises a repeating rod 336 displaceable with a time lag for cocking and releasing the firing pin 305, Fig. 16, and for turning the repeating roller 304. A trigger guard 345 co-operates with an adjustable stop 350 to limit its displaceability to allow individual sporadic or continuous firing of the firearm. The trigger guard 345 co-operates through a plunger 346 with one end of a firing lever 306 pivotally mounted on the firing pin 305 depending on the position of the stop 350, its other end engaging as a lock behind the back of the repeating roller 304 being urged by a spring 307. A magazine 328 is located in front of the repeating roller 304 and contains cartridges 353 which are held spirally between reeled belts 354, the latter being wound on to a roller 355 after the cartridges have been removed therefrom. A stop 358, Fig. 21, is provided and the adjacent cartridge is in the path of a loading rod 324, Fig. 16, attached to the repeating piston 322 in front of one of the cylindrical openings 344 in the repeating roller 304. The magazine 328 is provided with a window 359, Fig. 21, through which markings &c. on the belt can be observed. A stop 418, Figs. 29 and 30, is provided in an ejection duct 415 for holding each cartridge shell ejected from the repeating roller 304 and is mounted on a lever 416 which is pivotable about a pin 417. The lever 416 is in a vertical position when the firing pin 305 is cocked and a fresh cartridge is loaded, the stop 418 being located behind the repeating roller 304, the distance being equivalent to the length of a cartridge.