Drilling rig with improved mast support structure

Details Drilling rig with improved mast support structure Drilling rig with improved mast support structure

1975-07-07

1977-03-01

Purser, Ernest R.

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Tilts relative to base

173151, E04H 1234

Patent

active

040095444

ABSTRACT:
An improved portable drilling rig for drilling deep boreholes in the earth, in which the mast is rotatable to a horizontal position at a small distance above the ground. The mast is of rectangular construction, with four corner columns, and four support legs. While the mast is supported in a vertical position with four shoes, it rotates about the two back supports.
The mast is supported on two longitudinal stiffening members, of a U shape in cross-section. When the mast is lowered to a horizontal position, the front supporting columns drop below the top surface of the U shaped stiffening members and rest on the shallow bottom of the space between the two arms of the U. This puts the bottom of the mast within a foot or two above the ground, so that workmen may find it convenient to do work on the mast itself.

REFERENCES:
patent: 2300480 (1942-11-01), Woolslayer et al.
patent: 2403080 (1946-07-01), Hilborn
patent: 2679910 (1954-06-01), Moore
patent: 3807109 (1974-04-01), Jenkins

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