The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 1999
Filed:
Sep. 29, 1997
Applicant:
Inventor:
Gordon Leonard McLaren, North Bay, CA;
Assignee:
Boart Longyear Inc., North Bay, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23B / ;
U.S. Cl.
CPC ...
279-412 ; 279-409 ; 279 65 ;
Abstract
A hydraulic chuck for a drill string has a hydraulic actuator to operate the jaws. The actuator remains stationery while the spindle is rotated and a pair of skirts attached to the actuator cover the bearing assemblies. The jaws are supported in slots in the spindle and are part cylindrical to reduce stress in the spindle. The chuck is secured to a drive unit by bolts received in open slots in an attachment flange to facilitate attachment of the chuck after routine maintenance.