Rotary boring head

Details Rotary boring head Rotary boring head

1978-03-02

1980-03-18

Pate, III, William F.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Pivoted about substantially longitudinal axis

175171, 175394, E02D 1714

Patent

active

041934628

ABSTRACT:
A rotary boring head for earth and rock formations with pivotal wings which may be swung radially outwardly and which are provided with inclined return rails. Upon upward movement of the rotary boring head the earth mass presses upon the inclined return rails, so that the pivotal wings are reliably swung inwards again and cannot impinge on the bore tube.

REFERENCES:
patent: 1779575 (1930-10-01), Wilson
patent: 2112228 (1938-03-01), Kandle
patent: 2838285 (1958-06-01), Gredell
patent: 2990896 (1961-07-01), Kandle
patent: 3032128 (1962-05-01), Walton
patent: 3385383 (1968-05-01), Sturgeon
patent: 3693734 (1972-09-01), Richmond
patent: 3734214 (1973-05-01), Benetti

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