Importance

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Abstract

A vertical hydraulic hoist device includes a base, a tubular member with a lower end securely mounted on the base, a hoisting rod, an actuating assembly, a lifting assembly, and a stop assembly. The hoisting rod includes a plurality of vertically spaced annular recesses each of which defines an upper edge and an annular recess which tapers upwardly. The actuating assembly is mounted in an upper section of the tubular member, including upper and lower caps and a hollow actuating tube extending through the upper and lower caps, together defining an annular chamber therebetween in which working fluid is received. A piston is mounted in the chamber, while upper and lower openings are respectively formed in upper and lower sections of the tubular member and communicate with oil pipes through which the piston is controlled. The hollow actuating tube is securely connected to the piston to move therewith. The lifting assembly is mounted to the upper end of the hollow actuating tube to move therewith and engages with the upper edge of a recess above the actuating tube to effect the upward movement of the hoisting rod when the piston moves upward. When the piston stops as the article reaches the height to be lifted, the stop assembly prevents downward movement of the hoisting rod.

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First Claim