Boring head

Details Boring head Boring head

E - Fixed Constructions

21

B

255/75

E21B 10/28 (2006.01) E21B 7/28 (2006.01) E21B 10/20 (2006.01)

Patent

CA 1148929

ABSTRACT OF THE DISCLOSURE A boring head for reaming a pre-drilled hole in raise boring or for similar earth cutting operations comprising a plurality of roller cutters. For purposes of extending the radius of the boring head in operation or decreasing its dimensions during transport one or several extension elements are provided for detachable attachment to the boring head by means of a wedge connection.

376820

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