Patent · US Active

Pick with a bearing

US7475948B2 · kind B2 · utility

59Cited by

96References

15Claims

0Family size

Inventors

David R. Hall · Provo, US
Ronald B. Crockett · Payson, US
Jeff Jepson · Spanish Fork, US
Francis Leany · Salem, US

Key dates

Filing date	Apr 30, 2007
Grant date	Jan 13, 2009
Priority date	—
Expiry date	May 1, 2027

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21C35/1831
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

In one aspect of the invention, a degradation assembly comprises a holder. The holder is attached to a driving mechanism and comprises a longitudinal central bore. A pick comprises a body intermediate a shank and an impact tip, and the shank is disposed in the central bore of the holder. The impact tip comprises an impact surface diamond or cubic boron nitride. At least one rolling element is disposed intermediate an inner bore surface and the shank, and is adapted for low-friction rotation with respect to both the inner bore surface and the shank.

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