Military cannon barrel extension - uses worm bars rotated by three drive shafts

摘要

The outer tubes (1,2,3) are successively pushed outwards by worm bars on the barrel wall are located three worm bars at the same angle to one another (3 x 120 deg.). The three drive shafts (19) are set the worm bars (15) in the required direction of rotation by bevel gears(18,17). The tube (2) moves from the stopper ring (21) by rotation of the worm bars up to the threaded limit. The tube in this area is provided with an inner thread. The tube is then extended by rotation of the worm bars (15) which in turn rotates the bevel gears, activating also further cone wheels (13). The tube (2) begins then to move out of the first tube (1). The same process is repeated for the third barrel tube (3). USE/ADVANTAGE - To extend the barrel of a military cannon.