Breech mechanisms

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F41Weapons F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE

F41A3/00Breech mechanisms

F41A3/02Block action F41A3/04with pivoting breech-block F41A3/06about a horizontal axis transverse to the barrel axis at the rear of the block F41A3/08carrying a rotably mounted obturating plug of the screw-thread or the interrupted-thread type F41A3/10with sliding breech-block F41A3/12Bolt action F41A3/14Rigid bolt locks F41A3/16the locking elements effecting a rotary movement about the barrel axis F41A3/18hand-operated F41A3/20Straight-pull operated bolt locks F41A3/22the locking being effected by rotating the operating handle or lever transversely to the barrel axis F41A3/24the locking elements forming part of the operating handle or lever F41A3/26semi-automatically or automatically operated F41A3/28having fixed locking elements on the non-rotating bolt and rotating locking elements mounted on the barrel or breech housing F41A3/30Interlocking means F41A3/32the bolt being rocked about a notional axis transverse to the barrel axis F41A3/34the bolt additionally effecting a sliding movement transverse to the barrel axis F41A3/36Semi-rigid bolt locks F41A3/38having rocking locking elements F41A3/40mounted on the bolt F41A3/42hand-operated F41A3/44having sliding locking elements F41A3/46mounted on the bolt F41A3/48hand-operated F41A3/50Toggle-joint locks F41A3/52hand-operated F41A3/54Bolt locks of the unlocked type F41A3/56the bolt being provided with an additional slidable mass F41A3/58Breakdown breech mechanisms F41A3/60Breech mechanisms for guns having two or more barrels F41A3/62using combustion gas pressure for adding to the mechanical locking action, or for delaying breech opening movement F41A3/64Mounting of breech-blocks Accessories for breech-blocks or breech-block mountings F41A3/66Breech housings or frames Receivers F41A3/68Bolt stops F41A3/70Anti-rebound arrangements F41A3/72Operating handles or levers Mounting thereof in breech-blocks or bolts F41A3/74Obturating or packing devices for gas leak prevention in breech mechanisms F41A3/76specially adapted for sealing the gap between the forward end of the cartridge chamber and the rearward end of the barrel F41A3/78Bolt buffer or recuperator means F41A3/80Adjustable spring buffers F41A3/82Coil spring buffers F41A3/84mounted within the gun stock F41A3/86mounted under or above the barrel F41A3/88mounted around the barrel F41A3/90Fluid buffers F41A3/92adjustable F41A3/94in combination with spring buffers