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:
Jun. 06, 1989
Filed:
Aug. 22, 1988
Applicant:
Inventor:
Paul A Biek, Houston, TX (US);
Assignee:
Dresser Industries, Inc., Dallas, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B25D / ;
U.S. Cl.
CPC ...
173 935 ; 81463 ; 464 25 ;
Abstract
An impulse unit (10) is disclosed which provides for a symmetric transfer of torque between a case (16) and spindle (18) selectively for one or two impulses for each relative rotation between the case and spindle. A pair of cylindrical rollers (84, 86) is provided to isolate two symmetric chambers between the case and spindle to transfer torque therebetween. The use of cylindrical rollers reduces the overall wear in the tool, improves oil sealing capability during long time use, and reduces the cost of manufacture.