Abstract:
A method for joining pipes in which a first pipe in which at least one portion to be engaged is sunk inward to an inner circumferential surface side provided in an outer circumferential surface of an end portion of the first pipe, and a second pipe made of thermoplastic resin are joined together. The method includes: inserting an end portion of the first pipe into an end portion of the second pipe; and as a result of a component that transmits ultrasonic waves against an outer circumferential surface of the second pipe that corresponds to the portion to be engaged of the inserted first pipe, softening the second pipe by the ultrasonic waves so that an engaging portion is formed which is made to protrude into the portion to be engaged and is positioned on the inner circumferential surface of the first pipe.
Abstract:
The present invention is a method for joining pipes in which a first pipe in which at least one portion to be engaged that is sunk inward to an inner circumferential surface side is provided in an outer circumferential surface of an end portion of the first pipe, and a second pipe that is made of thermoplastic resin are joined together, and includes: a first step in which an end portion of the first pipe is inserted into an end portion of the second pipe; and a second step in which, as a result of a transmitting component that transmits ultrasonic waves being pressed against a position on an outer circumferential surface side of the second pipe that corresponds to the portion to be engaged of the inserted first pipe, the second pipe is softened by the ultrasonic waves so that an engaging portion is formed which is made to protrude into the portion to be engaged, which is positioned on the inner circumferential surface side of the first pipe, and becomes engaged with this portion to be engaged.
Abstract:
An insertion section of an endoscope has a flexible tube portion and a bending portion whose proximal end portion is coupled with a distal end of the flexible tube portion, a plurality of node rings are aligned in a bending tube serving as a base body portion of the bending portion, opening portions as through openings are provided in a node ring, protruding portions each having substantially the same shape as the opening portion are provided on an outer peripheral surface of a joint portion of the flexible tube portion that is inserted into the node ring, and a coupling structure according to the present invention couples the bending portion with the flexible tube portion by inserting the joint portion into the node ring and fitting the protruding portions into the opening portions.