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Extra info for 40 mm Antiaircraft Gun [Mk. 1, 2] [Ord. Pmphlt. 820, prelim]
The feed pawls, due to the action of the tray guides, are pressing the rounds down. This forces the bottom round between the star wheels and onto the tray. B. COCKING THE RAMMER Figure 35 The barrel assembly, breech mechanism, and tray are still moving forward in counterrecoil and have almost reached battery position. The live round is now on the tray with its base in the slots of the rammer levers. The rammer shoe is being held back by the tray catch lever, and as the tray moves forward, the rammer spring is compressed, cocking the rammer.
To permit a quarter turn of the star wheels. It lowers the breech block. through the hand operating rod. to a position which causes the extractors to lock the block down. A clip of four rounds is now placed in the loader and pushed smartly home, rotating the star wheels and placing the lowermost round on the rammer tray with its base in the slots of the rammer levers. The clip is automatically detached from the rounds, and ejected through the clip chute of the loader. These rounds press back the feed control lever, disengaging the loader catch lever from the rammer shoe.
2987 68-2 ) RAMMER CONTROL SPINDLE ARM (298750-2) CHAPTER II MECHANISM DESCRIPTION D. RECOIL CYLINDER ASSEMBLY The recoil cylinder assembly, Figure 2L provides the necessary retarding force during the recoil and counterrecoil strokes to limit the length of recoil and to control the velocity of counterrecoil. The recoil cylinder is a ltached under the forepart of the slide, and the piston rod is attached to lugs on the housing. LOCKING PLATE THROTTLING BUSHING (298732 -8) NEEDLE VALVE PACKING VALVE SEAT CYLINDER (298737 -2) RECOI~ DRAIN PLUG VA LVE SPRING (298 73 2-2) NUT (298732 - 1) Figure 21 The recoil cylinder shown in the illustration has been cut open to reveal the relationship of its parts.
40 mm Antiaircraft Gun [Mk. 1, 2] [Ord. Pmphlt. 820, prelim]