Patent ID: 8262135
Filing Date: 2012-09-11
Classification: B25B,F16L,F25B,Y10T

Abstract:
1. A duplex pipe fitting comprising a fitting main body having a pair of first thread portions and a pair of coupling members having second thread portions which are threaded to the respective first thread portions of the fitting main body while being attached to pipes to be connected to the fitting main body, each of the coupling member being threaded to the fitting main body so that two pipes are connected to each other with the fitting main body, wherein each of the coupling members has a holding portion including a holding surface formed of a pair of or a plurality of pairs of planes facing each other, the holding portion being capable of being held with a general fastening tool, wherein at least a part of the holding portion including the holding surface is separated from the coupling member in the course of pipe connecting, wherein the coupling member includes a pipe through hole extending along a central axis, a slit formed on the entire circumference of the coupling member in such a manner as to divide the coupling member into two parts, and a thin-wall tubular coupling portion formed between the slit and the pipe through hole, wherein a portion of the coupling member that is on a side opposite to the fitting main body of the slit is formed as the holding portion, and a portion of the coupling member that is on the same side as the fitting main body of the slit is formed as a pipe connecting portion, the pipe connecting portion including the thread portions that are threaded to the fitting main body and constituting a pipe connecting mechanism for hermetically joining the fitting main body and the pipe, wherein the part including the holding surface is separated from the coupling member at the tubular coupling portion when the rotational torque for tightening the coupling member to the fitting main body reaches the value indicating the completion of fastening, and wherein the fitting main body has a cylindrical portion in which the entire pipe connecting portion is accommodated in a state after the fastening is complete, and the coupling member is located at a position where the slit substantially coincides with the end of the cylindrical portion in a state after the fastening is complete.