초록 ▼

A portable power driven post driver. The post driver has an inner hollow cylinder open at its upper end and adapted to receive a post through a locking mechanism located at its lower end. The inner cylinder is located within an outer hollow cylinder in sliding engagement therewith, the outer cylinde

A portable power driven post driver. The post driver has an inner hollow cylinder open at its upper end and adapted to receive a post through a locking mechanism located at its lower end. The inner cylinder is located within an outer hollow cylinder in sliding engagement therewith, the outer cylinder having a closed upper end in contact with the upper end of a post held in said inner cylinder. Two fluid powered cylinders and associated pistons are attached to the outer surface of the outer cylinder, the longitudinal axes of the two fluid powered cylinders being in alignment. A common piston rod extends between the two pistons and is attached by a fastening member to the inner cylinder, the fastening member extending through a slot in the outer cylinder. A valve receives compressed fluid, such as compressed air, and cyclically and alternately directs the compressed fluid to the two fluid powered cylinders to alternately raise the outer cylinder above the inner cylinder and to drive the upper cylinder downwardly into post driving contact with the upper end of a post held by the inner cylinder.

대표청구항 ▼

[ The invention claimed is:] [1.] A portable power driven post driver comprising:an inner hollow cylinder open at an upper end for receiving and holding a post;an outer hollow cylinder having a closed upper end;said inner cylinder being located inside said outer cylinder in sliding engagement therew

[ The invention claimed is:] [1.] A portable power driven post driver comprising:an inner hollow cylinder open at an upper end for receiving and holding a post;an outer hollow cylinder having a closed upper end;said inner cylinder being located inside said outer cylinder in sliding engagement therewith;a first fluid powered cylinder and piston attached to an upper outer surface of said outer cylinder;a second fluid powered cylinder and piston attached to a lower outer surface of said outer cylinder, longitudinal axes of said first and second fluid powered cylinders being in alignment;a piston rod connecting said first and second pistons, said piston rod being attached to said inner cylinder by fastening means extending through a slot in a wall of said outer cylinder;a valve for receiving compressed fluid and cyclically directing fluid to said first fluid powered cylinder through a first conduit to raise said outer cylinder above said inner cylinder from a first position and then directing fluid to said second fluid powered cylinder through a second conduit to thereby drive said outer cylinder down to said first position.