Fig. 33.
The functions of the latch-spring have already been explained.
The Stop (c, [Fig. 32]) enters the carrier-ring on the left side between the lugs (e), and projects beyond the bore of the carrier-ring, entering a groove in the breech-block which is cut for it. This stop limits the travel of the block to the rear in withdrawing it, and also limits its rotation.
The Hinge-pin enters the lugs (e) of the carrier-ring and a corresponding lug on the jacket from below, and the carrier-ring swings around it in opening. The bore is the diameter of the ring across guide-sectors.
The exterior taper forms the surface of contact of carrier-ring with jacket.
The lugs (e) are the bearings for the hinge-pin. The carrier-ring, as its name indicates, carries the breech-block when the latter is withdrawn, and by means of it the block may be swung round out of the way for loading.
THE DE BANGE OBTURATOR.
Fig. 34.