Bore undercutting tool

Details Bore undercutting tool Bore undercutting tool

1981-06-29

1983-10-25

Purser, Ernest R.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by longitudinally relatively movable...

82 15, 408159, 166 557, E21B 1032

Patent

active

044113242

ABSTRACT:
A bore undercutting tool which is composed of a barrel and a cutter feed driver which is inserted for longitudinal displacement but also for co-rotation into the barrel and projects from the rearward end thereof. In a slot provided in the forward end portion of the barrel there is fulcrumed a cutter in the form of a two-armed lever which can be rocked by a cutter feed cam provided on the forward end of the cutter feed driver, in proportion to the longitudinal displacement of the latter relative to the barrel, such that a cutting tool disposed on the one lever arm can either be retracted into the slot or rocked out of same. A spring biases the barrel and the cutter feed driver toward a position in which the cutting tool is withdrawn into the slot.

REFERENCES:
patent: 165787 (1875-07-01), Bullock
patent: 226067 (1880-03-01), Hayden
patent: 473909 (1982-05-01), Bullock
patent: 1045670 (1912-11-01), Buck et al.
patent: 1955631 (1934-04-01), Harris
patent: 2202986 (1940-06-01), Ellis
patent: 2203011 (1940-06-01), Ellis et al.

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