Patent ID: 7437872

Claim:
An object separating apparatus using gas, comprising: a hollow housing of which closed end is connected to a first object and the other end is opened; a cylinder movably installed at an inner space of the housing in an axial direction of the housing; a piston assembly coupled to the cylinder at the inner space and connected to a second object at an outer end thereof where is exposed to the outside of the housing; a fixing portion disposed between the housing and the cylinder and the piston assembly to fix the cylinder and the piston assembly into the housing; and a gas generator mounted on the housing to be communicated with the inner space, wherein when the gas generator is operated, the gas generator pressurizes the cylinder so as to release the fixed state between the cylinder and the piston assembly by the fixing portion and to simultaneously separate the cylinder and the piston assembly from the housing, wherein the fixing portion includes: a support portion protruding from the closed end of the housing toward the inner space and having a ball groove at an outer circumferential surface thereof; a plurality of stopping balls arranged in a plurality of receiving holes which are formed in a circumferential direction of an inner end of the piston assembly into which the support portion is inserted, and mounted in the ball groove; and an elastic body disposed between the piston assembly and the cylinder to pressurize the cylinder into which the inner end of the piston assembly is inserted toward the closed end of the housing to thus prevent the stopping balls from being separated from the ball groove.