An improved system and method for bracing, transporting, assembling, and disassembly of drilling equipment at oil and gas land-based well sites. The system has a substructure with side boxes support bracing that are in a scissor jack (or grand pli) style bracing with telescoping tension link(s), linking pins, and vertical hydraulic cylinders. These linking pins are set after raising the substructure and secure the telescoping tension link, support arms, and support bracing in place to maintain the integrity of the substructure. Alternatively the system has a substructure with side boxes support bracing that are in a scissor jack (or grand pli) style bracing with screw jacks and a means of stabilization during substructure raising. The substructure bracing reduces the overall length, reduces the upper and lower box spans, and balances the raising loads, subsequently lowering the transport weight of the side box such that a commercial walking system may be integrated into the side box and remain there during transport while maximizing the operating drill floor height while minimizing the transport height.

A lifting cart apparatus for engaging and moving a vehicle body component includes a wheeled base frame with a lift for raising and lowering a support platform relative to the base frame. The support platform has a pair of support arms for supporting a vehicle body component. A stabilizer is coupled to the support platform for engagingly stabilizing the vehicle body component on the support platform.

A lifting cart apparatus for engaging and moving a vehicle body component includes a wheeled base frame with a lift for raising and lowering a support platform relative to the base frame. The support platform has a pair of support arms for supporting a vehicle body component. A stabilizer is coupled to the support platform for engagingly stabilizing the vehicle body component on the support platform.

An engagement chain has two chain members. Each of the chain members includes link plates, each of which has two pin holes, and coupling pins. The two pin holes are aligned in the advancing/retreating direction and are sized differently from each other. Each of the coupling pins of each chain member is tightly received in the smaller pin hole of the two pin holes of one of any adjacent two of the link plates in the advancing/retreating direction and is loosely received in the larger pin hole of the two pin holes of the other one of the two adjacent link plates. In a state in which the chain members are integrated with each other, any two of the coupling pins that are opposed to each other are in the same received states in the corresponding pin holes.

An engagement chain has two chain members. Each of the chain members includes link plates, each of which has two pin holes, and coupling pins. The two pin holes are aligned in the advancing/retreating direction and are sized differently from each other. Each of the coupling pins of each chain member is tightly received in the smaller pin hole of the two pin holes of one of any adjacent two of the link plates in the advancing/retreating direction and is loosely received in the larger pin hole of the two pin holes of the other one of the two adjacent link plates. In a state in which the chain members are integrated with each other, any two of the coupling pins that are opposed to each other are in the same received states in the corresponding pin holes.

An elevator machine lifting assembly constructed in accordance to one example of the present disclosure includes a guide assembly, a frame assembly and a first jack assembly. The guide assembly include a guide base that supports the elevator machine and at least one roller. The frame assembly has a first vertical support member and a first baseplate. The first vertical support member provides a first track that receives the at least one roller thereon. The first jack assembly has a first lifting member that selectively moves relative to a first vertical column between a first position and a second position, the second position having a higher elevation than the first position. Movement of the lifting member from the first position to the second position causes the guide base and elevator machine to be raised relative to the frame assembly while the at least one roller rolls along the first track.

An elevator machine lifting assembly constructed in accordance to one example of the present disclosure includes a guide assembly, a frame assembly and a first jack assembly. The guide assembly include a guide base that supports the elevator machine and at least one roller. The frame assembly has a first vertical support member and a first baseplate. The first vertical support member provides a first track that receives the at least one roller thereon. The first jack assembly has a first lifting member that selectively moves relative to a first vertical column between a first position and a second position, the second position having a higher elevation than the first position. Movement of the lifting member from the first position to the second position causes the guide base and elevator machine to be raised relative to the frame assembly while the at least one roller rolls along the first track.

A vertically movable workpiece support device has a ratchet wheel with a larger diameter than the outer diameter of a driving sprocket wheel and is concentrically attached to an end surface of a boss portion in the driving sprocket wheel. A pair of left and right bearing members are provided side by side, on a side on which the free end side of a drive chain is horizontally extended with respect to the driving sprocket wheel, so as to sandwich a horizontally extending path section of the drive chain. A movable pawl is pivotally supported between the pair of left and right bearing members and engages with the ratchet wheel to block the rotation of the ratchet wheel caused by the movement of the drive chain when the workpiece support base is lowered. An actuator switches the movable pawl to a non-action position with respect to the ratchet wheel.

A vertically movable workpiece support device has a ratchet wheel with a larger diameter than the outer diameter of a driving sprocket wheel and is concentrically attached to an end surface of a boss portion in the driving sprocket wheel. A pair of left and right bearing members are provided side by side, on a side on which the free end side of a drive chain is horizontally extended with respect to the driving sprocket wheel, so as to sandwich a horizontally extending path section of the drive chain. A movable pawl is pivotally supported between the pair of left and right bearing members and engages with the ratchet wheel to block the rotation of the ratchet wheel caused by the movement of the drive chain when the workpiece support base is lowered. An actuator switches the movable pawl to a non-action position with respect to the ratchet wheel.

A hoist for removing an object to enable an individual to work on the object includes a first substantially vertical support mounted on a floor surface. A second substantially vertical support mounted on the floor surface and being spaced a predetermined distance away from the first substantially vertical support. The first and second substantially vertical supports include an upper surface. A substantially horizontal member extending across the upper surfaces of the first and second substantially vertical supports. A first vertical lift is operatively positioned within the first substantially vertical support. A second vertical lift is operatively positioned within the second substantially vertical support. The first and second vertical lifts selectively raising the member relative to the floor surface. A winch is operatively mounted on the substantially horizontal member for lifting the object relative to the member for enabling an individual to work on the object.