Patent · US Expired

Rotary drill bit

US4298079A · kind A · utility

24Cited by

7References

15Claims

0Family size

Assignees

SANDVIK LTD · SE
AKTIEBOLAGET SKF · SE

Inventors

Gosta Norlander · Bleckede, DE
Angelo Vignotto · Torino, IT
Mario Micca · Torino, IT

Key dates

Filing date	Apr 1, 1980
Grant date	Nov 3, 1981
Priority date	—
Expiry date	Apr 1, 2000

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16C2352/00
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A rotary roller bit comprising at least one rotatably carried roller cutter (12) and provided with sealing means (21) for preventing impurities from entering into the bearing system (14, 15, 16,) of the roller cutter. For purposes of preventing axial and wobbling movements of the roller cutter (12) relative to the bit head from creating high contact pressure at the contact surface between the sealing means (21) and the surface against which same seals the sealing means (21) is provided with an elastically yieldable tongue (25) which extends radially relative to the rotational axis of the roller cutter (12).

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