Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1974-12-30
1976-04-13
Purser, Ernest R.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
166178, E21B 110
Patent
active
RE0287687
ABSTRACT:
A single tool, having a bumper free-stroke chamber and jar free-stroke chamber spaced apart by the usual reduced-diameter barrel section, is provided. The tool carries impact faces and is adapted to selectively jar upwardly or bump downwardly.
REFERENCES:
patent: 2721056 (1955-10-01), Storm
patent: 3405773 (1968-10-01), Sutliff et al.
patent: 3716109 (1973-02-01), Griffith
patent: 3729058 (1973-04-01), Roberts
Ebel Jack E.
Lee-Mason Tools Ltd.
Purser Ernest R.
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