Air-driven post driver

Tool driving or impacting – Impacting devices

Patent

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Details

173114, 173136, B23B 4516, B25D 914

Patent

active

058066080

ABSTRACT:
An air-driven post driver that includes a hammer assembly and a post receiving assembly. The hammer assembly includes an air-driven piston hammer slidably disposed within a cylinder bore of a cylinder body having a circumferential compressed air groove of a first groove width formed into the cylinder wall that defines the cylinder bore and an upper discharge port and a lower discharge port. The piston hammer includes an upward thrusting air passageway and a downward thrusting air passageway. The upward thrusting air passageway includes a radially oriented upward intake passageway and a longitudinally oriented upward discharge passageway. The upward discharge passageway is of a length greater than one half the length of the piston hammer. The downward thrusting passageway includes a radially oriented downward intake passageway and a longitudinally oriented downward discharge passageway having a threaded downward discharge port. The downward discharge passageway is of a length greater than one-half the length of the piston hammer.

REFERENCES:
patent: 542498 (1895-07-01), Rinsche
patent: 1119198 (1914-12-01), Smith
patent: 1654833 (1928-01-01), Rice, Jr.
patent: 2392061 (1946-01-01), Pfeiffer
patent: 3736843 (1973-06-01), Leibundgut
patent: 4550784 (1985-11-01), Ottestad et al.
patent: 4632190 (1986-12-01), Mikiya
patent: 4658901 (1987-04-01), Alexander
patent: 4984640 (1991-01-01), Gillan et al.

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