Pneumatically operated burrowing tool

Details Pneumatically operated burrowing tool Pneumatically operated burrowing tool

1984-11-29

1986-09-02

Yost, Frank T.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

175 19, E21B 100

Patent

active

046090525

ABSTRACT:
A burrowing tool having a pneumatically reciprocable piston hammer concentrically slidable about an adjustable valve sleeve, wherein the valve sleeve may be positioned to cause the piston hammer to impact against either a forward or a rearward anvil, with position mechanism including a threaded and slotted reversing screw removably fitted into the rearward end cap of the tool, the slotted portions of the reversing screw serving as a plurality of exhaust ports, wherein the end cap is sized to permit removal of the valve and inner mechanism upon removal of the reversing screw from the tool.

REFERENCES:
patent: 3137483 (1964-06-01), Zinkiewicz
patent: 3616865 (1971-11-01), Sudnishnikov
patent: 3651874 (1972-03-01), Sudnishnikov et al.
patent: 3705633 (1972-12-01), Sudnishnikov et al.
patent: 3756328 (1973-09-01), Sudnishnikov et al.
patent: 3995702 (1976-12-01), Klimashko et al.
patent: 4132277 (1979-01-01), Tupitsyn et al.

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