Raise boring head with retractable gage cutters

Details Raise boring head with retractable gage cutters Raise boring head with retractable gage cutters

1978-05-30

1980-03-25

Leppink, James A.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175269, 175344, E21C 2300

Patent

active

041945786

ABSTRACT:
A raise boring system is provided that allows the raise boring head to be easily and efficiently lowered back through the completed raise hole. The raise head includes a multiplicity of rolling cutters positioned in saddles that are firmly affixed to the body of the raise head. These fixed saddles and rolling cutters comprise the primary cutting stage of the raise head. A multiplicity of retractable gage cutters are located radially outside of the primary cutting stage. The retractable gage cutters comprise rolling cutters positioned in moveable saddles. The moveable saddles and rolling cutters can be selectively withdrawn inside the primary cutting stage. A hydraulic-pneumatic system is provided for withdrawing the retractable gage cutters.

REFERENCES:
patent: 3038710 (1967-06-01), Robbins
patent: 3232670 (1966-02-01), Robbins et al.
patent: 3285667 (1966-11-01), Gonski
patent: 3379264 (1968-04-01), Cox
patent: 3386520 (1968-06-01), Lawrence et al.
patent: 3387893 (1968-06-01), Hoever
patent: 3437380 (1969-04-01), Lawrence
patent: 3485309 (1969-12-01), Lawrence
patent: 3486572 (1969-12-01), Hamilton et al.
patent: 4010808 (1977-03-01), Youngblood
patent: 4083416 (1978-04-01), Still et al.

Affiliated with

Also associated with

Rating

Raise boring head with retractable gage cutters does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Raise boring head with retractable gage cutters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Raise boring head with retractable gage cutters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1398117