Patent ID: 8746749

Claim:
A tube fitting comprising: a tubular main body; a sleeve being tubular-shaped and being positioned within said main body with axial lines of the main body and the sleeve being coincided with each other, said sleeve including a side groove circumferentially extending around a portion of an outer circumferential surface of the sleeve; a locking member having a ring part and a plurality of extended parts extended, from the ring part, in an axial direction, the locking member including a protruded part and said locking member being substantially nested within the sleeve in a state where axial lines of the ring part and the sleeve are coincided with each other and being movable in the sleeve in an axial direction with said protruded part moving into said side groove to selectively permit rotation of the entire locking member in a circumferential direction; wherein each of the extended parts has facing press nails protruding inward, and a distance between the facing press nails is made smaller than an outer diameter of the tube so as to press the tube inserted into a space therebetween by the facing press nails; wherein the locking member has a first tapered face and the sleeve has a first contact part corresponding to the first tapered face to decrease the diameter of the extended parts; wherein, when inserting the tube into the space, the tube is fixed and contacted with pressure by the facing press nails, when the tube is pulled and moved in a pulling and removing direction without being rotated, the locking member is pulled and moved in the pulling and removing direction with the first tapered face decreasing the diameter of the extended parts that comes into contact with the first contact part corresponding to the first tapered face in a state of being struck and slides the first contact part in a state of being contacted and the distance between the extended parts is lessened; wherein the locking member has a second tapered face and the sleeve has a second contact part corresponding to the second tapered face to release the locking member; and wherein, during removal of the tube inserted into the space wherein the tube is fixed and contacted with pressure by the facing press nails is rotated and the tube is pulled and moved in a pulling and removing direction in a circumferentially directional position in which the tube is rotated, the locking member is pulled and moved in the pulling and removing direction and the second tapered face to release the locking member comes into contact with the second contact part corresponding to the second tapered face and slides the second contact part to extend the distance between the extended parts, contact with pressure by the facing press nails is released.