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:
Feb. 24, 1976
Filed:
Jun. 12, 1974
Applicant:
Inventor:
Lester A Amtsberg, Utica, NY (US);
Assignee:
Chicago Pneumatic Tool Company, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16D / ;
U.S. Cl.
CPC ...
64 2 / ; 64 23 ; 175320 ;
Abstract
A rotatable drill string of a rock drill in which a torsionally elastic shaft provides a rotary driving connection between the drill string and the rock bit for absorbing the usual excessive torque developing in the string during a drilling operation. A lost motion clutch member becomes effective following a predetermined extreme degree of flexing of the torsion shaft to relieve the latter of further added torque load.