Tool driving or impacting – With vehicle support for drive
Patent
1998-05-28
1999-12-21
Vo, Peter
Tool driving or impacting
With vehicle support for drive
173 28, 173 29, 173 89, 173 91, 173132, E21B 702
Patent
active
060036192
ABSTRACT:
A driver hammer for driving an elongated member into the earth and for extracting the member from the earth includes a hammer body and a forward driving anvil slidably mounted in the body that is engaged directly with the elongated member when the latter is driven into the earth. A conventional hammer drive mechanism is used to repeatedly impact the forward driving anvil to drive the member into the earth. When the member is to be extracted from the earth, a back driving lever, which is pivotally mounted on the hammer body, is pivoted into the position where the forward driving anvil can strike an impact surface on one side of the pivot point of the lever and a back driving anvil is engaged with a second impact surface on the opposite side of the pivot point of the lever and which is attached to the elongated member. Accordingly, the forward driving anvil repeatedly strikes the first impact surface, thereby causing the second impact surface to pivot upwardly and impact the back driving anvil, which extracts the member from the earth.
REFERENCES:
patent: 1024173 (1912-04-01), Betts
patent: 1213989 (1917-01-01), Wilson
patent: 3205952 (1965-09-01), Sicotte
patent: 4405020 (1983-09-01), Rassieur
patent: 4993500 (1991-02-01), Greene et al.
patent: 5647442 (1997-07-01), Lange
Calve James P.
Vo Peter
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