Abstract: A method of manufacturing a sprocket segment that is formed by forging as one of a plurality of circumferentially divided parts of a sprocket having a plurality of teeth arranged on an outer peripheral surface of a circular flange, the method includes: forming a material of the sprocket segment into an initial formed state in an initial forming step; and subjecting the sprocket segment in dies to a finish forming process with a tooth trace direction of the sprocket segment as viewed in cross-section of the sprocket segment being inclined relative to a forging direction of the dies in a finish forming step.

Abstract: A pipe expanding device inserts a pipe expanding punch into an opening end portion of a steel pipe with a special shape in the state where the opening end portion of the steel pipe with a special shape is pressed in an insertion direction of the punch.

Abstract: A cab includes left and right rear pole members having internal spaces and prescribed shapes in cross-section. The right rear pole member includes a first hole portion that extends along the longitudinal direction of the right rear pole member and penetrates the right rear pole member in the left-and-right direction of the right rear pole member, and a first plate-shaped member inserted into and secured in the first hole portion.

Abstract: A cab for a construction machine includes a pillar member and a beam member. The pillar member is disposed generally along a vertical direction, and includes a cutout portion and a protruding portion. The cutout portion is formed on an upper end thereof. The protruding portion is formed on the upper end on an inner side of the cutout portion with respect to a widthwise direction of the cab. The beam member is disposed generally along a direction perpendicular to the vertical direction. The beam member is joined to the pillar member with the beam member partially overlapping the cutout portion on the upper end of the pillar member in a plan view, and a lateral surface of the beam member abutting against the protruding portion.

Abstract: A method of manufacturing a sprocket segment that is formed by forging as one of a plurality of circumferentially divided parts of a sprocket having a plurality of teeth arranged on an outer peripheral surface of a circular flange, the method includes: forming a material of the sprocket segment into an initial formed state in an initial forming step; and subjecting the sprocket segment in dies to a finish forming process with a tooth trace direction of the sprocket segment as viewed in cross-section of the sprocket segment being inclined relative to a forging direction of the dies in a finish forming step.

Abstract: A reinforcement structure for a pipe includes a hole section and a plate member. The hole section is formed on an outer peripheral surface of the pipe along a longitudinal direction of the pipe to pass through a peripheral wall of the pipe to reach an interior portion of the pipe. The plate member is inserted in the hole section and secured to the pipe.

Abstract: A cab for a construction machine includes a pillar member and a beam member. The pillar member is disposed generally along a vertical direction, and includes a cutout portion and a protruding portion. The cutout portion is formed on an upper end thereof. The protruding portion is formed on the upper end on an inner side of the cutout portion with respect to a widthwise direction of the cab. The beam member is disposed generally along a direction perpendicular to the vertical direction. The beam member is joined to the pillar member with the beam member partially overlapping the cutout portion on the upper end of the pillar member in a plan view, and a lateral surface of the beam member abutting against the protruding portion.

Abstract: A cab includes left and right rear pole members having internal spaces and prescribed shapes in cross-section. The right rear pole member includes a first hole portion that extends along the longitudinal direction of the right rear pole member and penetrates the right rear pole member in the left-and-right direction of the right rear pole member, and a first plate-shaped member inserted into and secured in the first hole portion.

Abstract: A reinforcement structure for a pipe includes a hole section and a plate member. The hole section is formed on an outer peripheral surface of the pipe along a longitudinal direction of the pipe to pass through a peripheral wall of the pipe to reach an interior portion of the pipe. The plate member is inserted in the hole section and secured to the pipe.

Abstract: A pipe expanding device inserts a pipe expanding punch into an opening end portion of a steel pipe with a special shape in the state where the opening end portion of the steel pipe with a special shape is pressed in an insertion direction of the punch.