A collapsible drilling rig substructure is transported to a drilling site while in a collapsed transportation configuration wherein a raisable floor of the substructure is in a lowered transportation position relative to a fixed drill floor such that an upper surface of the raisable floor is positioned at a first height level above a base of the substructure while an upper surface of the fixed drill floor is positioned at a second height level above the base that is greater than the first height level. The substructure is positioned adjacent to a wellbore location at the drilling site and reconfigured from the lowered transportation configuration to a raised operating configuration by raising the raisable floor to an operating position laterally adjacent to the fixed drill floor while maintaining a height level of the upper surface of the fixed drill floor at the second height level.

A pipe handling apparatus has a frame, a boom pivotally connected to the frame so as to be movable between a first position and a second position, an arm extending outwardly of the boom when the boom is in the second position, and a gripper affixed to the end of the arm opposite the boom. A pair of arm-tensioning mechanisms is connected to the arm and provide for tensioning of the arm. A pair of boom-lateral-adjustment mechanisms is connected to the upper portion of the boom and provide for lateral adjustment of the boom. A pair of rocker-arm-adjustment mechanisms is connected to the link and provide for adjustment of the link.

A spray boom assembly includes a first boom frame and a second boom frame pivotally coupled via a hinge assembly to the first boom frame about a pivot axis. The spray boom also includes an actuator assembly for pivoting the second boom frame relative to the first boom frame. The hinge assembly includes a first joint location, a second joint location, a third joint location, a fourth joint location, and a fifth joint location. A first end of the actuator assembly is coupled to the hinge assembly at the fourth joint location and a second end thereof is coupled to the first boom frame at a sixth joint location. A spherical joint is located at at least three of the first, second, third, fourth, fifth and sixth joint locations.

Implementations of cranes may include a first telescoping boom and a second telescoping boom coupled within the first telescoping boom. The second telescoping boom may be entirely within the first telescoping boom when the second telescoping boom is in a fully extended position.

Luffing jib crane includes a mast surmounted by a rotating part orientable about a vertical axis and a rotating pivot pivotally mounted on the mast. The luffing jib crane further includes a counter-jib including a central section and a horizontal radial section directed rearwards and fastened to the central section which comprises a base fastened to the rotating pivot and a top (65) surmounting the base. The luffing jib crane further includes a luffing jib directed forwards and having a rear end articulated to the base of the central section of the counter-jib, below the top, in a manner diametrically opposed to the radial section of the counter-jib. The crane has a punch fastened to the top of the central section of the counter-jib, and extending obliquely upwards and backwards from the top.

Luffing jib crane includes a mast surmounted by a rotating part orientable about a vertical axis and a rotating pivot pivotally mounted on the mast. The luffing jib crane further includes a counter-jib including a central section and a horizontal radial section directed rearwards and fastened to the central section which comprises a base fastened to the rotating pivot and a top (65) surmounting the base. The luffing jib crane further includes a luffing jib directed forwards and having a rear end articulated to the base of the central section of the counter-jib, below the top, in a manner diametrically opposed to the radial section of the counter-jib. The crane has a punch fastened to the top of the central section of the counter-jib, and extending obliquely upwards and backwards from the top.

The present disclosure relates to a crane, for example a mobile crane, having a main boom and a luffing jib pivotably articulated to the main boom, a retaining stay extending between the main boom and the luffing jib, the retaining stay having a lifting element whose length can be varied and being thereby variable in its length.

The present disclosure relates to a crane, for example a mobile crane, having a main boom and a luffing jib pivotably articulated to the main boom, a retaining stay extending between the main boom and the luffing jib, the retaining stay having a lifting element whose length can be varied and being thereby variable in its length.