Inner ring press-insertion jig for a pipe member made of resin

An inner ring press-insertion jig for a pipe member made of resin for inserting a sleeve-like inner ring into one end portion of a pipe member made of resin, wherein:

• a pipe member holding portion which horizontally fixedly holds one end portion of said pipe member is placed in a front end side in a longitudinal direction of a jig body, and a press insertion rod supporting portion is placed in a rear end side to be opposed to said pipe member holding portion;
• a press insertion rod is passed through and supported by said press insertion rod supporting portion in an advanceable and retractable manner;
• a ring holder which has at a front end a ring holding shaft portion that extractably holds an inner ring is detachably coupled to a front end of said press insertion rod idly rotatable about an axis;
• an internal thread hole portion is disposed in a center portion of a front end face of said press insertion rod, a coupling shaft protrudes rearwardly from a center portion of a rear end face of said ring holder, a holder block is passed idly rotatably and lockedly through said coupling shaft portion of said ring holder, said holder block having:
• a cylindrical portion in which an external thread portion is formed on an outer peripheral;
• and a flange which is formed integrally with a front end of said cylindrical portion, and said external thread portion of said cylindrical portion is screwingly coupled to said internal thread hole portion;
• and
• an internal thread portion is disposed in said press insertion rod supporting portion, said press insertion rod has an external thread portion which is to be screwed with said internal thread portion, and is passed through said press insertion rod supporting portion, and a grip is disposed in a rear end portion of said press insertion rod which protrudes rearwardly from said press insertion rod supporting portion.