Pneumatically driven reverse impact device

Details Pneumatically driven reverse impact device Pneumatically driven reverse impact device

1992-02-10

1992-11-17

Watts, Douglas D.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

173135, 173211, 29254, B25D 902, B25D 1706

Patent

active

051635194

ABSTRACT:
A device for removing pins, nails, dowels, rods, and the like from material which includes wood, metal, concrete, and human and animal bone, includes a pneumatically actuated piston producing a reverse impact striking effect which causes extraction of the pin from the material. The device includes a main housing comprising a tool handle, an elongated barrel partially mounted in the tool handle, and a muffler housing fitted on the barrel and abutting the tool handle. A central chamber extends the length of the barrel, and disposed within the central chamber is a shaft which is adapted for linear reciprocal movement therein. An anvil is mounted at the inner end of the shaft and a tool holder is mounted at the opposite end of the shaft. Slidably disposed on the shaft is a piston which is adapted for linear reciprocable movement thereon for forcibly striking the anvil. An upper valve block, a lower valve block, and a flipper valve positioned therebetween are located within the tool handle adjacent the anvil for directing pressurized air from an external source into the central chamber, and concomitant with the exhaustion of air from the central chamber, causes the slidable movement and the reverse striking impact of the piston against the anvil, thus effecting pin removal.

REFERENCES:
patent: 618324 (1899-01-01), Blum
patent: 1292429 (1919-01-01), Bull
patent: 2561577 (1951-07-01), Knudsen
patent: 3739452 (1973-06-01), Gadberry
patent: 4114950 (1978-09-01), Cooper
patent: 4586230 (1986-05-01), Harydzak et al.

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