Patent · US Active

Cutting bit and extraction tool for same

US9874095B2 · kind B2 · utility

0Cited by

9References

33Claims

0Family size

Assignee

Joy MM Delaware, Inc. · US

Inventors

John R. Frederick · Richfield, US
Rudie Boshoff · Warrendale, US

Key dates

Filing date	Apr 11, 2016
Grant date	Jan 23, 2018
Priority date	—
Expiry date	Apr 11, 2036

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21C35/188
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A cutting bit for a bit assembly secured to a cutter head includes a cutting end, a shank extending along a bit axis, and a shoulder positioned between the cutting end and the shank. The shoulder includes an outer edge defining a perimeter, a shoulder end surface defining a shoulder plane, a first inclined surface and a second inclined surface. The first inclined surface is positioned between the outer edge and the shoulder end surface. The first inclined surface extends along the perimeter and is oriented at a first acute angle relative to the shoulder plane. The second inclined surface is positioned between the shoulder end surface and the first inclined surface. The second inclined surface is oriented at a second acute angle relative to the shoulder plane, and the second acute angle is smaller than the first acute angle.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.