| 摘要 |
PROBLEM TO BE SOLVED: To provide a water shut-off structure of a turn portion capable of reliably shutting off water at a turn portion even in adjusting an angle.SOLUTION: A water shut-off structure of a turn portion includes: a cylindrical portion 12b having a cylindrical outer peripheral face S1 on a turn shaft Sa as a center; a mounting portion 4c having an inner peripheral face S2 rotatably fitted to the outer peripheral face S1; a ring groove G1 annularly formed on the outer peripheral face S1; an O-ring R6 mounted in the ring groove G1; an engagement recessed portion G2 formed on the outer peripheral face S1; and a retaining screw B3 radially engaged with the mounting portion 4c having the inner peripheral face S2, from an outer side, and inserting a tip portion Ba into the engagement recessed portion G2. The engagement recessed portion G2 defines an allowance portion Y with the tip portion Ba of the retaining screw B3 for permitting relative movement of the cylindrical portion 12b and the mounting portion 4c in a direction along the turn shaft Sa within a range not separating the O-ring R6 from the inner peripheral face S2. |
