The present invention relates to devices and methods for transporting a Blow Out Preventer (BOP). A device for transporting and installing a BOP stack for a land-based drilling rig, comprises: a skid for transporting a BOP stack in a substantially horizontal position; and a moveable support configured to be fixed removably to one end of the BOP stack and to translate longitudinally on the skid; wherein a section of the skid is extendable longitudinally outwards from an end of the skid, into an extended configuration in which the section can placed adjacent to or on a place of installation of the BOP stack, and is configured to be part of the skid on which the moveable support is configured to translate, so that the moveable support may translate longitudinally onto the section of the skid, in its extended configuration, to be above the place of installation.

The present invention relates to devices and methods for transporting a Blow Out Preventer (BOP). A device for transporting and installing a BOP stack for a land-based drilling rig, comprises: a skid for transporting a BOP stack in a substantially horizontal position; and a moveable support configured to be fixed removably to one end of the BOP stack and to translate longitudinally on the skid; wherein a section of the skid is extendable longitudinally outwards from an end of the skid, into an extended configuration in which the section can placed adjacent to or on a place of installation of the BOP stack, and is configured to be part of the skid on which the moveable support is configured to translate, so that the moveable support may translate longitudinally onto the section of the skid, in its extended configuration, to be above the place of installation.

An unmanned aerial vehicle having an airframe whose horizontal dimension is efficiently reduced. This object is solved by an unmanned aerial vehicle that includes: a rotor; an arm; and an arm connector. The arm connector includes an arm holder that is a fixing member holding a part of the arm in a longitudinal direction of the arm. The part of the arm held by the arm holder is changeable by sliding the arm in the longitudinal direction of the arm relative to the arm holder. The arm holder is a movable member movable in directions in which the arm is turned upward and downward and/or rightward and leftward. The object is also solved by an unmanned aerial vehicle that includes: a rotor; an arm; and an arm connector. The arm is provided with a hinge on which the arm is foldable at a middle portion of the arm.

A robot including a base having a flat mounting surface section to be set on an installation surface by a fixing part, and also including a movable unit that is movable relative to the base. The base includes a tip-over prevention member that is disposed in a switchable manner between a state where the tip-over prevention member at least protrudes forward from the mounting surface section in a moving direction when a relocating process is performed and a state where the tip-over prevention member does not protrude forward from the mounting surface section.

A robot including a base having a flat mounting surface section to be set on an installation surface by a fixing part, and also including a movable unit that is movable relative to the base. The base includes a tip-over prevention member that is disposed in a switchable manner between a state where the tip-over prevention member at least protrudes forward from the mounting surface section in a moving direction when a relocating process is performed and a state where the tip-over prevention member does not protrude forward from the mounting surface section.

The present invention provides an extendible enclosure, having a first frame member supporting a first mesh canopy and a second frame member supporting a second mesh canopy. A sliding mechanism coupling the first frame member to the second frame member is operable to reversibly extend the enclosure between a first contracted position and a second extended position, where the first frame member is configured to slidingly engage with the second frame member so that the second frame member at least partially nests within the first frame member when in the first contracted position. The extendible enclosure is particularly suited for objects such as tools, equipment and machinery.

The present invention provides an extendible enclosure, having a first frame member supporting a first mesh canopy and a second frame member supporting a second mesh canopy. A sliding mechanism coupling the first frame member to the second frame member is operable to reversibly extend the enclosure between a first contracted position and a second extended position, where the first frame member is configured to slidingly engage with the second frame member so that the second frame member at least partially nests within the first frame member when in the first contracted position. The extendible enclosure is particularly suited for objects such as tools, equipment and machinery.

An agricultural tool unit includes a tool configured to engage the ground and a mounting device. The mounting device supports the tool and presents a device opening configured to receive the frame member. The mounting device includes driving and driven cam elements, with the driven cam element defining at least part of the device opening. The mounting device further includes a cam element shifter operable to selectively impart relative shifting of the cam elements in a first direction. The cam elements present respective cam surfaces that are complementally shaped and slidably engaged with one another to define a cam interface, with the cam interface extending transversely to the first direction such that the driven cam element is moved in a transverse second direction when the cam elements are relatively shifted by the cam element shifter. The driven cam element is configured to adjustably exert a force against the frame member when moving in the second direction.

An agricultural tool unit includes a tool configured to engage the ground and a mounting device. The mounting device supports the tool and presents a device opening configured to receive the frame member. The mounting device includes driving and driven cam elements, with the driven cam element defining at least part of the device opening. The mounting device further includes a cam element shifter operable to selectively impart relative shifting of the cam elements in a first direction. The cam elements present respective cam surfaces that are complementally shaped and slidably engaged with one another to define a cam interface, with the cam interface extending transversely to the first direction such that the driven cam element is moved in a transverse second direction when the cam elements are relatively shifted by the cam element shifter. The driven cam element is configured to adjustably exert a force against the frame member when moving in the second direction.

The present disclosure relates to a lifting apparatus. The lifting apparatus may include a base column, a mobile column, a sliding component, a supporting arm, a lifting system, and a move-coordination system. The mobile column connected to the base column may be vertically movable relative to the base column. The lifting system may be configured to cause the movement of the mobile column. The sliding component connected to the mobile column may be vertically movable relative to the mobile column. The mobile column and the sliding component may be connected via the move-coordination system, which enables the sliding component and the mobile column to move simultaneously according to a predetermined relative motion relationship. The supporting arm may be connected to the sliding component.