| 摘要 |
PURPOSE: A coupler for metal pipes is provided to securely connect a metal pipe as spherical protrusions form a furrow-shaped line groove on the outer circumference of a metal pipe. CONSTITUTION: A coupler for metal pipes comprises a body(10), a rubber ring(20), a metal ring(30), a fastening washer(40), and a fastening member(50). One side of a rubber ring contacts an inclined surface for expanding a body. The metal ring is laminated on the exterior of the rubber ring. Multiple projection plates of the fastening washer are projected in the columnar direction. Spherical pressing projections(42a) of the projection plate form a line groove for securely fixing the metal pipe. The male screw(51) of the fastening member is coupled with the female screw(11) of the body.
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