Toggle actuated underreamer

Details Toggle actuated underreamer Toggle actuated underreamer

1976-06-25

1977-05-17

Purser, Ernest R.

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by longitudinally relatively movable...

175238, 175396, E02D 17148

Patent

active

040236293

ABSTRACT:
An underreamer includes a housing and a plurality of underreamer doors, each including a toggle mechanism for selectively extending and retracting the doors. Upon activation of the toggle mechanism thereby extending the doors, the doors are pivoted outwardly from the housing and the tops of the doors are simultaneously moved downwardly. In this manner the overall vertical height of an underreamer adapted to form a given diameter excavation may be substantially reduced.

REFERENCES:
patent: 2235159 (1941-03-01), Litter
patent: 3513920 (1970-05-01), Watson

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