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US 4,393,949 AGranted
Rock boring apparatus
AssigneePeterson Associates, Ltd.
InventorCarl R. Peterson
Life of this patent
Estimating the term…
Abstract
Apparatus for boring holes in rock comprising a boring head rotatable about an axis of advance and a multiplicity of cutters mounted on the head, a plurality of which each comprises a cutter body rotatable about a cutter axis and cutting tooth means forming a helical path about the cutter axis.
Claims11
Apparatus for boring holes in rock comprising
- a boring head rotatable about an axis of advance, and
- a multiplicity of cutters mounted on said head, at least a plurality of said cutters each comprising a helical disc cutter comprising
- a cutter body rotatable about a cutter axis, and cutting tooth means forming a helical path about said cutter axis, wherein said path does not close upon itself, the locus of said path upon rotation of said head having a generally conical envelope tapering in the direction of said advance
- each said cutter body being mounted on said boring head for free rotation about said cutter axis, whereby each cutting tooth means cuts a substantially circular track about said axis of advance.
1 more element
A cutter useful in apparatus for boring holes in rock comprising a boring head rotatable about an axis of advance, said cutter comprising
- a cutter body rotatable about a cutter axis, and
- cutting tooth means forming at least one helical turn about said cutter axis, wherein said turn does not close upon itself, the locus of said path upon rotation of said head having a generally conical envelope tapering in the direction of said advance
- each said cutter being adapted to be mounted on said boring head for free rotation about said cutter axis, whereby each said cutting tooth means cuts a substantially circular track about said axis of advance.
Dependencies are inferred from the claim text.