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A trunnion (from Old French trognon 'trunk') [1] is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development. First associated with cannons, they are an important military development.
From the 16th to the mid-19th century, the main form of artillery remained the smoothbore cannon.By this time, the trunnion (a short axle protruding from either side of the gun barrel) had been developed, with the result that the barrel could be held in two recesses in the carriage and secured with an iron band, the "capsquare".
The turret consists of upper and lower parts, joined by a trunnion. The gap between these two parts is often covered by a visible rubber or canvas bellows. The gun itself is fixed to the upper part of the turret. Elevation of the gun is achieved by tilting the entire upper part of the turret. In conventional designs, the gun is mounted inside ...
The mount includes elements of the machine gun cooling system. A swing mount is a fixed mount that allows a far greater and more flexible arc of fire than the simple pintle mount system. Utilising a system of one or two articulated arms the gunner can swing the weapon through a wide arc even though the gunner's position is fixed relative to the ...
Pacific Car and Foundry Company received a contract to build the Elevated Kinetic Energy (ELKE) vehicle which was completed and sent off for testing in 1982. It mounted the MC-AAAC in an external elevating trunnion mount with a very wide range of elevation and depression angles, with the turret mounted on the hull of an M551. [2]
The trunnion has a cut-out on the right side which is designed to engage the stock catch and lock it in place when folded. The wooden stock is mounted in a pivoting hull, which contains a catch that secures the buttstock in the extended position.
Pacific Car's proposal mounted the Ares 75 mm gun in an external elevating trunnion mount alongside a coaxial 25 mm M242 Bushmaster autocannon. Twenty-two 75 mm ready rounds (11 APFSDS and 11 HE respectively) could be carried in a magazine and thirty-three more could be carried in hull storage. [8]
Two bosses in the form of cylinders on a mechanical part. The cylinder to the right is filleted near its base.. In engineering, a boss is a protruding feature on a workpiece. [1]