| 摘要 |
PROBLEM TO BE SOLVED: To prevent warping or adhesion defective of a distal end part of a lip part for preventing deterioration of water tightness and gas tightness of a seal packing. SOLUTION: This seal packing 10 is provided at a tube joint part of spigot 5 and a socket 6, comprising a base body part 12 engaged with an outer circumferential surface at an end part of the insert spigot 5, and a projected part 11 projected outward in a tube diameter direction. The projected part 11 has lip parts 13a and 13b projected both inward and outward in a tube axis direction in the whole periphery. An outer circumferential surface of the projected part 11 is inclined to become higher from the outward side to the inward side to be recessed along the tube axis direction. The spigot 5 is engaged in the socket 6, so that the projected part 11 is pressed on the inward side, and pushed up on the outward side to be deformed like a seesaw to be tightly applied to an inner circumferential surface of the socket. Since the outer circumferential surface of the projected part 11 is curved, the tip part of the lip part 13b will not hang down even in the case of being compressed to the base body part. By setting height of the distal end part of the lip part 13b on the outward side to be lower than a tube end inner circumference of the socket 6, the distal end part of the lip part 13b will not warp. COPYRIGHT: (C)2005,JPO&NCIPI
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