Importance

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Abstract

The invention comprises a lifting apparatus having a mobile housing with three telescoping sleeves slidably mounted in one another and in said housing to slide upward in telescoping relation out of said housing. The housing has a hydraulic piston and cylinder mounted upright in the housing, with the piston fixed to the housing and the cylinder is hydraulically actuatable to telescope upward in the housing relative to the piston. Rollers are mounted to the top of the cylinder and the first two of the sleeves. A first chain has one end mounted below the roller on the cylinder and its other end mounted to the lower end of the first of the sleeves. A second chain is mounted to the housing below the roller on the first sleeve and its other end mounted on the other side of the roller to the lower end of the second sleeve. A third chain is mounted below the roller on the second sleeve on one side and below the roller to the lower end of the third chain on the other side, whereby the actuating cylinder causes the first chain to move upward and thereby the first sleeve to move upward, which causes the second chain to move the second sleeve upward, causing the third chain to move the third sleeve upward with each sleeve telescoping with respect to one another. The third sleeve is mounted with a lifting frame for lifting objects thereon during the telescoping action of the sleeves. A detachable power pack is mounted to the housing for powering the cylinder.

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First Claim