Derrick tilting system

Details Derrick tilting system Derrick tilting system

1975-04-07

1976-12-07

Purser, Ernest R.

Tool driving or impacting

Drive by means reacting to rotating eccentric mass

52116, 173 29, 173145, 173163, 248 2, E21B 302, E21B 1500

Patent

active

039957012

ABSTRACT:
A shaft drilling machine generally includes a pivotable power swivel supported on a drilling assembly moved along a mast by hydraulic cylinders. Improved means for positioning the mast include a screw jack assembly with one end adapted to be secured to the power swivel and the other end secured to the base of the machine.

REFERENCES:
patent: 2686040 (1954-08-01), Lear
patent: 3695363 (1972-10-01), Kelly, Jr.
patent: 3780816 (1973-12-01), Arrington et al.
patent: 3850253 (1974-11-01), Lupton et al.

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