US 6,981,722 B2 | ||
Pipe coupling device | ||
Toshikazu Watanabe, Nagoya (Japan) | ||
Assigned to Denso Corporation, (Japan) | ||
Filed on Jun. 14, 2004, as Appl. No. 10/865,921. | ||
Claims priority of application No. 2003-185932 (JP), filed on Jun. 27, 2003; and application No. 2004-107792 (JP), filed on Mar. 31, 2004. | ||
Prior Publication US 2004/0262921 A1, Dec. 30, 2004 | ||
Int. Cl. F16L 35/00 (2006.01); F02M 55/02 (2006.01) |
U.S. Cl. 285—353 | 18 Claims |
1. A pipe coupling device comprising:
a main body defining a main body passage hole to permit communication between inside the main body passage hole and outside
the main body passage hole;
a fixing screw member joined to the main body and surrounding a periphery of the main body passage hole, the fixing screw
member having external threads formed on its outer peripheral surface, and exhibiting a substantially hollow cylindrical hollow
shape; and
a sleeve inserted in the fixing screw member;
a tilt-preventing gap and a mouth deformation allowing gap being defined between the sleeve and the fixing screw member, the
tilt-preventing gap and the mouth deformation allowing gap being axially in series;
a pipe fastening screw member that is coupled to a pipe so as to be rotatable with respect to a tip end thereof, the pipe
fastening screw member having internal threads formed on an inner peripheral surface thereof engaged with the external threads
of the fixing screw member, whereby:
an intra-pipe passage defined in the pipe communicates with the main body passage hole through a sleeve passage hole formed
at a center of the sleeve;
a first convergently tapered portion formed at said tip end of the pipe presses against a first pressure bearing surface formed
at a first end of the sleeve to form a first seal portion; and
a second convergently tapered portion formed at a second end of the sleeve presses against a second pressure bearing surface
formed at an opening portion of the main body passage hole to form a second seal portion, wherein the mouth deformation allowing
gap is defined radially outside of and axially overlapping with the first pressure bearing surface and has a radial dimension
that is larger than a radial dimension of the tilt-preventing gap such that a clamping load applied to the first pressure
bearing surface of the sleeve substantially eliminates the tilt-preventing gap to prevent tilting of the sleeve within the
fixing screw member and allows the first end of the sleeve to freely radially deform.
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