Patent ID: 7503593

Claim:
A joint for plumbing, comprising: a body ( 20 ) having a symmetrical form from the center thereof, the body ( 20 ) having a stopping part ( 21 ) formed in the center thereof for stopping a pipe ( 10 ) to be inserted into the body ( 20 ); extended parts respectively extending from the stopping parts ( 21 ) to a predetermined limit of the body ( 20 ) for closely contacting and supporting the pipe ( 10 ); concave parts ( 22 ), each being formed from the extended part to a predetermined limit; tapered parts ( 23 ), each having a diameter greater than that of the concave part ( 22 ) and gradually narrowed as it goes toward an inlet; and inlets ( 26 ), each being formed in such a manner as to be bent in a “L” form at the narrowest end of the tapered part ( 23 ) for inserting the pipe ( 10 ) thereto; a packing ( 27 ) mounted in the concave part ( 22 ) inside the body ( 20 ) and being in close contact with the outer peripheral surface of the pipe ( 10 ) for providing sealability; a spring ( 24 ) having an end supported by a protrusion of the concave part ( 22 ) and the other end located toward the inlet ( 26 ) of the body ( 20 ), the other end having the final round ( 24 a ) and an adjacent round forming a circle, which is at right angles to the insertion direction of the pipe ( 10 ), the final round ( 24 a ) being designed in such a manner as to be positioned in parallel with the adjacent round and at a predetermined interval from the adjacent round; and a stopper ( 25 ) inserted between the final round ( 24 a ) and the adjacent round of the spring ( 24 ), which are located toward the inlet ( 26 ), wherein a contact surface contacting the tapered part ( 23 ) of the body ( 20 ) is smooth and a contact surface contacting the pipe ( 10 ) has a saw-toothed shape to maximize friction force to the pipe ( 10 ), the stopper ( 25 ) being greater in hardness than the body ( 20 ) or the pipe ( 10 ) so that the stopper ( 25 ) is inserted between the inner peripheral surface of the body ( 20 ) and the outer peripheral surface of the pipe ( 10 ) to provide a wedge action to fix the pipe ( 10 ) when the pipe ( 10 ) is inserted.