SHOT-VELOCITY REGULATOR FOR GAS-OPERATED FIREARMS

摘要

It is necessary to provide a cadence regulator in a gas-pressure operated firing weapon, since a hot firing weapon would otherwise exhibit a cadence unacceptably greater than that of a cold firing weapon. The cadence regulator comprises two concentric tubes interconnected at one end and serving for actuating a temperature-dependent throttling member which regulates the gas-pressure by altering a throttling cross-section of a gas passage. Either only the inner tube is heated, causing it to expand more than the outer tube and to reduce the throttling cross-section, or both tubes are heated and the outer tube has a greater coefficient of expansion such that it expands more than the inner tube and increases the throttling cross-section. In the first case, the supply of gas to a gas piston is throttled and thereby diminished in pressure and in the second case, a discharge opening to the atmosphere is increased, also effectively diminishing the pressure of the supply of gas to the gas piston.