Portable post driving apparatus

Details Portable post driving apparatus Portable post driving apparatus

1997-06-13

1998-10-13

Smith, Scott A.

Tool driving or impacting

Impacting devices

173 32, 173128, 173132, B25D 908, E02D 710

Patent

active

058198571

ABSTRACT:
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.

REFERENCES:
patent: 2392061 (1946-01-01), Pfeiffer
patent: 2882690 (1959-04-01), Frederick
patent: 2988158 (1961-06-01), Baldwin
patent: 3566977 (1971-03-01), Wandell
patent: 4665994 (1987-05-01), Snider
patent: 5174388 (1992-12-01), Williams et al.
patent: 5662175 (1997-09-01), Warrington et al.

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