US 6,981,721 B2
Joint for high pressure fluid
Yukihiko Karasawa, Saitama (Japan)
Assigned to Karasawa Fine, LTD, Saitama (Japan)
Appl. No. 10/476,162
PCT Filed May 29, 2002, PCT No. PCT/JP02/05240
§ 371(c)(1), (2), (4) Date Apr. 02, 2004,
PCT Pub. No. WO02/099327, PCT Pub. Date Dec. 12, 2002.
Claims priority of application No. 2001-168292 (JP), filed on Jun. 04, 2001.
Prior Publication US 2004/0164552 A1, Aug. 26, 2004
Int. Cl. F16L 17/00 (2006.01)
U.S. Cl. 285—353 3 Claims
OG exemplary drawing
 
1. A coupling for high-pressure fluid comprising:
a pipe having an inverse male screw near an end thereof;
a bush having a larger diameter than that of said pipe, said bush being screwed to the inverse male screw;
a box nut having a larger diameter hole, through which said bush can pass, on a tip end side, and a small diameter hole, through which the pipe passes, on a base end side;
a block having a female screw hole that is screwed to said box nut;
a fluid route opened at a bottom portion of the female screw hole of the block;
a washer made of soft material, said washer being inserted in an accommodating space at an end portion of the fluid route on the female screw hole side; and
a ring being screwed to a female screw of the female screw hole to support said washer at a predetermined position, said ring having a polygonal hole for supporting an end portion of the pipe which passes the box nut and of which end face abuts the washer.