Kelly crowd for vertical drill rig

Details Kelly crowd for vertical drill rig Kelly crowd for vertical drill rig

1975-11-13

1976-10-26

Purser, Ernest R.

Tool driving or impacting

Advance causing or controlling means

Tool advances relative to drive

175162, E21B 304, E21B 702

Patent

active

039878562

ABSTRACT:
A vertical drill rig having a drive kelly, a drilling tool supported from the lower end of the drive kelly, a rotary table, and a friction crowd for imparting via the drive kelly to the drilling tool a vertical driving force which is in excess of that provided by gravity alone. The disclosed friction crowd assembly includes concentric inner and outer sleeves, the outer sleeve being supported from the rotary table while the inner sleeve is vertically movable relative both to the outer sleeve and to the drive kelly. Rotary movement is imparted by means of first interengaging rib and keyway means from the outer sleeve to the inner sleeve, and by means of second interengaging rib and keyway means from the inner sleeve to the drive kelly. Crowding of the kelly is accomplished by applying a separate vertical driving movement to the inner sleeve.

REFERENCES:
patent: 1692431 (1928-11-01), Anderson
patent: 2730331 (1956-01-01), Harinck
patent: 3094312 (1963-06-01), Woolgar
patent: 3708020 (1973-01-01), Adamson

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