Boring head with extension elements

Details Boring head with extension elements Boring head with extension elements

1981-04-23

1983-06-07

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

299 80, 407 41, 407 49, E21B 1020

Patent

active

043866700

ABSTRACT:
A boring head for reaming a pre-drilled hole in raise boring or for similar earth cutting operations comprising a plurality of roller cutters (13-22). For purposes of extending the radius of the boring head (10) in operation or decreasing its dimensions during transport one or several extension elements (36, 37) are provided for detachable attachment to the boring head (10) by means of a wedge connection (42).

REFERENCES:
patent: 1332745 (1920-03-01), Bakes
patent: 3318392 (1967-05-01), Hoen
patent: 4108259 (1978-08-01), Dixon et al.
patent: 4142598 (1979-03-01), Maxsted

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