Mounting device for elastic tubular member and mounting method for elastic tubular member

A mounting method for an elastic tubular member, which expands a diameter of the elastic tubular member larger than an outer diameter of a rod-like body as an attachment target to mount the elastic tubular member on the rod-like body from an outside, the method comprising:

• by using a mounting device for an elastic tubular member including:
• a movable sleeve into which the rod-like body is capable of being inserted;
• a movable sleeve holding member that movably holds the movable sleeve in an axial direction;
• three or more arms, which are arranged on an outer periphery of the movable sleeve apart from each other in a circumferential direction and parallel to the axial direction and of which one end portion is attached to the movable sleeve holding member such that the arms are swingable in a radial direction of the movable sleeve;
• receiving portions each formed on the other end portion of each arm, which receive an inner peripheral surface of the elastic tubular member and are brought into a diameter-reduced state in which the elastic tubular member is capable of being set and a diameter-expanded state in which the elastic tubular member is capable of being mounted to the rod-like body due to swinging of the arms;
• a flange portion that is provided on a distal end side of the movable sleeve into which the rod-like body is inserted and that forms a distal end surface of the movable sleeve and allows passage of the arms;
• and
• three or more pushing portions for pushing the elastic tubular member, the pushing portion being formed on the distal end surface for each of positions of the arms, and at least one pushing portion having a height in a pushing direction different from that of the other pushing portion,
• moving the movable sleeve relative to the movable sleeve holding member to swing the arm by engagement between the movable sleeve and the arm, bringing the receiving portions into the diameter-expanded state from the diameter-reduced state, and thereafter pushing the elastic tubular member from the receiving portions by the pushing portions in order of the heights of the pushing portions.