Abstract: A crane includes a jib posture retention device that retains a jib in a frontward tilt posture to a boom. The jib posture retention device includes a jib mast that holds a rope connection part at a tensioning position separate from a jib proximal end and a boom distal end backward thereof to render a jib-side support rope and a boom-side support rope linearly tensioned with the jib in the frontward tilt posture. The jib mast is shiftable to a tension form of holding the rope connection part at a tensioning position in an uprise posture and a looseness allowing form of locating the rope connection part at a looseness allowing position closer to the boom distal end than the tensioning position and closer to the jib proximal end than the tensioning position to allow the jib-side support rope and the boom-side support rope to be loosened.

Abstract: An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely, and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a frame body to which the pair of attachment brackets are provided with an interval in a left-right direction of the upper turning body. The frame body is formed of a plurality of divided frames arranged side by side in the left-right direction of the upper turning body, adjacent divided frames of the plurality of divided frames being separably joined to each other.

Abstract: Lifting performance of a work machine is increased while suppressing an increase in a vehicle weight. When a slewing frame is seen from a side, a first reinforcement member is provided from a boom foot section to a front side part of a slewing bearing, a second reinforcement member is provided from the boom foot section to a mast foot section, and a third reinforcement member is provided from the mast foot section to a rear side part of the slewing bearing. Furthermore, a fourth reinforcement member is provided from a middle region (M) located at an upper end portion of the slewing frame and above a rear portion of the slewing bearing to the front side part of the slewing bearing, and a fifth reinforcement member is provided from the middle region (M) to the rear side part of the slewing bearing.

Abstract: There is provided a crane that is capable of adjusting the warp of a raising member mounted on a supporting body to be raised and lowered, where the adjustment is made according to a posture of the raising member and load of a cargo. The crane includes a crane body, a boom, a raising device, a main rope, a main winch, a mid-support rope, a mid-support winch, and a manipulation unit. The mid-support rope connects a middle portion of the boom to the guylink and includes a securing end P secured to the guylink. The mid-support winch winds up and winds out the mid-support rope to change the distance between the guylink and the boom.

Abstract: Lifting performance of a work machine is increased while suppressing an increase in a vehicle weight. When a slewing frame (1) is seen from a side, a first reinforcement member (11) is provided from a boom foot section (5) to a front side part of a slewing bearing (22), a second reinforcement member (12) is provided from the boom foot section (5) to a mast foot section (6), and a third reinforcement member (13) is provided from the mast foot section (6) to a rear side part of the slewing bearing (22). Furthermore, a fourth reinforcement member (14) is provided from a middle region (M) located at an upper end portion of the slewing frame (1) and above a rear portion of the slewing bearing (22) to the front side part of the slewing bearing (22), and a fifth reinforcement member (15) is provided from the middle region (M) to the rear side part of the slewing bearing (22).

Abstract: An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a main frame to which the pair of attachment brackets are provided with an interval in the left-right direction of the upper turning body. The dimension of the main frame in the front-rear direction of the upper turning body orthogonal to the left-right direction is smaller than the dimension of the main frame in the left-right direction.

Abstract: An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely, and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a frame body to which the pair of attachment brackets are provided with an interval in a left-right direction of the upper turning body. The frame body is formed of a plurality of divided frames arranged side by side in the left-right direction of the upper turning body, adjacent divided frames of the plurality of divided frames being separably joined to each other.

Abstract: Provided is a coupling unit capable of accurately determining a relative position between connectors despite welding across main pipes and connectors in a lattice structure. A coupling unit includes connectors to be joined to ends of main pipes, and a connector interconnection member that interconnects connectors to one another. Each of the connectors includes: a fitted part fittable to the end of the main pipe; a detachable connection part detachably connectable to a counterpart connector provided to an end of the other lattice structure; an outer peripheral surface weldable to an outer peripheral surface of the end of the main pipe while the fitted part is fitted to the end of the main pipe; and a connected part to which an end of the connector interconnection member is to be connected.

Abstract: There is provided a crane that is capable of adjusting the warp of a raising member mounted on a supporting body to be raised and lowered, where the adjustment is made according to a posture of the raising member and load of a cargo. The crane includes a crane body, a boom, a raising device, a main rope, a main winch, a mid-support rope, a mid-support winch, and a manipulation unit. The mid-support rope connects a middle portion of the boom to the guylink and includes a securing end P secured to the guylink. The mid-support winch winds up and winds out the mid-support rope to change the distance between the guylink and the boom.

Abstract: An upper turning body mounted on a lower body for a crane includes a turning frame mounted on the lower body to turn freely and a boom provided to the turning frame to be raised and lowered freely. The turning frame includes a pair of attachment brackets to which a base end section of the boom is attached such that the boom is free to be raised and lowered, and a main frame to which the pair of attachment brackets are provided with an interval in the left-right direction of the upper turning body. The dimension of the main frame in the front-rear direction of the upper turning body orthogonal to the left-right direction is smaller than the dimension of the main frame in the left-right direction.

Abstract: A pressure vessel having reduced weight while satisfying required design conditions has upper wall first and second ribs, upper curved surface portion first and second ribs, a bottom wall first rib with a bottom wall second rib formed on an outer surface of a bottom wall, lower curved surface portion first and second ribs, and a side wall first rib with a side wall second rib on an outer surface of a side wall. The center upper wall first rib has a center upper wall first rib center portion, a center upper wall first rib continuous portion, and a center upper wall first rib thin portion. The center bottom wall first rib has a center bottom wall first rib center portion, a center bottom wall first rib continuous portion, and a center bottom wall first rib thin portion.

Abstract: A pressure vessel having reduced weight while satisfying required design conditions has polygonal upper and bottom walls, a side wall provided therebetween, an upper curved surface portion for connecting the upper and side walls, and a lower curved surface portion for connecting the bottom and side walls. An upper wall center rib includes an upper wall center part, and upper wall annular ribs respectively connecting substantially center parts of the upper wall and surrounding the upper wall center rib. Ribs are formed substantially centrally in the upper curved surface portion. A bottom wall center rib includes a center part in the bottom wall. Bottom wall annular ribs are formed connecting the bottom wall and surrounding the bottom wall center rib. Lower curved surface portion ribs are formed substantially centrally in the lower curved surface portion, and main surface ribs are formed substantially centrally in the side wall.

Abstract: A pressure vessel having reduced weight while satisfying required design conditions has polygonal upper and bottom walls, a side wall between the upper and bottom walls, an upper curved surface portion connecting the upper wall's peripheral edge and the side wall's upper end wall by curved surfaces convexed outward, and a lower curved surface portion connecting the bottom wall's peripheral edge and the side wall's lower end by curved surfaces convexed outward. The upper wall center portion is thicker than the upper curved surface portion, which is thicker than an upper wall annular portion formed between the upper wall center portion and the upper curved surface portion. The bottom wall center portion is thicker than the lower curved surface portion, which is thicker than a bottom wall annular portion formed between the bottom wall center portion and the lower curved surface portion.

Abstract: A pressure vessel having reduced weight while satisfying required design conditions has polygonal upper and bottom walls, a side wall between the upper and bottom walls, an upper curved surface portion connecting the upper wall's peripheral edge and the side wall's upper end wall by curved surfaces convexed outward, and a lower curved surface portion connecting the bottom wall's peripheral edge and the side wall's lower end by curved surfaces convexed outward. The upper wall center portion is thicker than the upper curved surface portion, which is thicker than an upper wall annular portion formed between the upper wall center portion and the upper curved surface portion. The bottom wall center portion is thicker than the lower curved surface portion, which is thicker than a bottom wall annular portion formed between the bottom wall center portion and the lower curved surface portion.

Abstract: A pressure vessel having reduced weight while satisfying required design conditions has upper wall first and second ribs, upper curved surface portion first and second ribs, a bottom wall first rib with a bottom wall second rib formed on an outer surface of a bottom wall, lower curved surface portion first and second ribs, and a side wall first rib with a side wall second rib on an outer surface of a side wall. The center upper wall first rib has a center upper wall first rib center portion, a center upper wall first rib continuous portion, and a center upper wall first rib thin portion. The center bottom wall first rib has a center bottom wall first rib center portion, a center bottom wall first rib continuous portion, and a center bottom wall first rib thin portion.

Abstract: A pressure vessel having reduced weight while satisfying required design conditions has polygonal upper and bottom walls, a side wall provided therebetween, an upper curved surface portion for connecting the upper and side walls, and a lower curved surface portion for connecting the bottom and side walls. An upper wall center rib includes an upper wall center part, and upper wall annular ribs respectively connecting substantially center parts of the upper wall and surrounding the upper wall center rib. Ribs are formed substantially centrally in the upper curved surface portion. A bottom wall center rib includes a center part in the bottom wall. Bottom wall annular ribs are formed connecting the bottom wall and surrounding the bottom wall center rib. Lower curved surface portion ribs are formed substantially centrally in the lower curved surface portion, and main surface ribs are formed substantially centrally in the side wall.

Abstract: An inner joint member for a constant velocity universal joint is incorporated in an outer joint member and has multiple ball track grooves which are formed in an outer diameter surface thereof. A spherical surface roughness in a range extending from an axial center of the outer diameter surface to an end side of the outer diameter surface which corresponds to an opening side of the outer joint member is larger than a spherical surface roughness in a range extending from the axial center of the outer diameter surface to an end side of the outer diameter surface which corresponds to an inner side of the outer joint member.

Abstract: A cage for a constant velocity universal joint include, an outer diameter surface guided by an outer joint member; an inner diameter surface guided by an inner joint member; and pockets for accommodating multiple balls which are interposed between the outer joint member and the inner joint member. A spherical surface roughness in a range extending from an axial center of the inner diameter surface to an end side of the inner diameter surface which corresponds to an opening side of the outer joint member is different from a spherical surface roughness in a range extending from the axial center of the inner diameter surface to an end side of the inner diameter surface which corresponds to an inner side of the outer joint member.

Abstract: In a lattice boom, a first reinforcing lattice member includes a first reinforcing pipe which has a portion extending in the same direction as a first main member of a base boom and which is separated outward from a first side surface of the base boom and a first mounting part which is provided on the first reinforcing pipe and which is mounted to the first main member so as to transfer a load acting on the first main member in an axial direction of the first main member to the first reinforcing pipe, and a second reinforcing lattice member includes a second reinforcing pipe which has a portion extending in the same direction as a second main member of the base boom and which is separated outward from a second side surface of the base boom and a second mounting part which is provided on the second reinforcing pipe and which is mounted to the second main member so as to transfer a load acting on the second main member in an axial direction of the second main member to the second reinforcing pipe.

Abstract: Provided is an inner joint member for a constant velocity universal joint, which is capable of extending a life of a cutting tool and achieving reduction in manufacturing cost. The inner joint member for a constant velocity universal joint is incorporated in an outer joint member (3) and has multiple ball track grooves (5) which are formed in an outer diameter surface (4) thereof. A spherical surface roughness in a range extending from an axial center (15) of the outer diameter surface (4) to an end (A) side of the outer diameter surface (4) which corresponds to an opening side of the outer joint member (3) is larger than a spherical surface roughness in a range extending from the axial center (15) of the outer diameter surface (4) to an end (B) side of the outer diameter surface (4) which corresponds to an inner side of the outer joint member (3).