A hydraulic apparatus is shown for moving a heavy load along an I-beam shaped structural member comprising a releasable clamping assembly and a double-acting hydraulic jacking cylinder.
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Nov
Nov
A jacking apparatus comprises a rail having a plurality of pairs of vertical slots longitudinally spaced apart. A sled slides along this rail and has cross members to which are pivotably attached ends of hydraulic cylinders, the other ends of the hydraulic cylinders being pivotably attached to cross heads which also slide along the rail.
25
Nov
Nov
A jacking apparatus comprises a rail with an attached vertical rack having teeth with a steep front face and a sloping back. A notch is arranged in the back of each of the rack teeth.
25
Nov
Nov
A ship lifting apparatus, or drydock, is formed by a pair of parallel, spaced apart piers, which define a slip in which is located a platform onto which a ship can be floated. The platform is raised or lowered by a plurality of chain jacks mounted in aligned rows on each of the piers.
A chain jack is operated by alternately transferring the chain load from a cylinder or base latch mechanism to a ram head latch mechanism and moving the base and the ram head away from and toward each other by alternate extension and retraction of the ram to cause relative movement between the chain and the […]
25
Nov
Nov
A single jack ram is straddled by two chains resulting in low cost and a balanced load. Ram head latches and cylinder assembly latches are formed as double pins hydraulically operated and which are oriented at right angles to each other to engage consecutive links of the chain when the ram is completely retracted.
25
Nov
Nov
A chain jack has a pair of pawls, one attached to a hydraulic cylinder as a base and the other attached to the head of a ram, which is attached to a piston in the ram-actuating hydraulic cylinder.
25
Nov
Nov
A transporter for heavy loads has an upper pallet with peripheral supporting rails, and a sub-structure inside and spaced apart from the peripheral rails of the upper pallet.
25
Nov
Nov
A transporter for heavy loads has an upper pallet with peripheral supporting rails, and a sub-structure inside and spaced apart from the peripheral rails of the upper pallet. Vertical jacks between the substructure and the upper pallet raise or lower these sequentially, and means such as hydraulic cylinders are arranged to provide relative longitudinal or […]
25
Nov
Nov
A module and system for use in connection with the moving of multi-ton objects over a ground surface containing no rails. The modular concept permits moving heavy loads that are dimensionally large and that are not rigid enough to be supported at a few points.
