Boring head, roller cutter and saddle for a boring head for...

Details Boring head, roller cutter and saddle for a boring head for... Boring head, roller cutter and saddle for a boring head for...

2005-08-16

2005-08-16

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S053000

Reexamination Certificate

active

06929077

ABSTRACT:
A raise boring head includes a roller cutter body and a saddle intended for rotary drilling in earth and rock formations. The roller cutter body is rotatably journalled on a shaft that is provided with two shaft spigots at its opposite ends. Each spigot has a second support surface provided for cooperation with a first support surface of the saddle to hold the roller cutter to the saddle. Each shaft spigot is provided with a hole for receiving a fastener that also passes through the second support surface in order to connect the shaft spigot to the saddle. The first support surface and the second support surface are curved. The first support surface and the second support surface connect directly or indirectly to stop shoulders for counteracting rotation of the shaft. The fastener is eccentric to the shaft axis and arranged to press the stop surfaces together.

REFERENCES:
patent: 3601207 (1971-08-01), Coski
patent: 3612196 (1971-10-01), Dixon
patent: 3835944 (1974-09-01), Bingham
patent: 3836271 (1974-09-01), Coski
patent: 4448271 (1984-05-01), Persson
patent: 5487435 (1996-01-01), Crawley et al.
patent: 5984024 (1999-11-01), Strand

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