Abstract: A pipe cross-section processing device that reduces friction during processing and improves the degree of freedom regarding the rotation angle of the pipe cross section is provided. The pipe cross-section processing device may include a rotation drive source configured to rotate the base, a shaft secured to a front end portion of the base, a slide base capable of a sliding movement along the axis of the shaft, a roller guide member secured to the slide base, a slide-base drive member configured to convert the rotational motion of the base into a linear motion so as to drive the slide base together with the roller guide member in a sliding movement, and a roller configured to be adhered to an inner surface of a pipe cross section to rotationally process a cross section of the pipe outwardly in a radial direction of the pipe.

Abstract: A pipe cross-section processing device that reduces friction during processing and improves the degree of freedom regarding the rotation angle of the pipe cross section is provided. The pipe cross-section processing device may include a rotation drive source configured to rotate the base, a shaft secured to a front end portion of the base, a slide base capable of a sliding movement along the axis of the shaft, a roller guide member secured to the slide base, a slide-base drive member configured to convert the rotational motion of the base into a linear motion so as to drive the slide base together with the roller guide member in a sliding movement, and a roller configured to be adhered to an inner surface of a pipe cross section to rotationally process a cross section of the pipe outwardly in a radial direction of the pipe.

Abstract: The invention provides a structure of a loosening-stop tightening means, a loosening-stop bolt having the structure, a method for producing the same bolt, a loosening-stop nut having the structure, and a method for producing the same nut, by which the screwing force can be prevented from being lowered when an external force is applied to a member to be tightened and a screw thread, etc.