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:
Oct. 05, 1982
Filed:
Sep. 18, 1980
Applicant:
Inventors:
Paul O Wendler, Saginaw, MI (US);
Donald L Dzioba, Frankenmuth, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16H / ; F16H / ;
U.S. Cl.
CPC ...
74 55 ; 74569 ;
Abstract
A vacuum pump having a cam actuated spring-biased pumping element and a gear for rotatably driving the cam has a torque counterbalancing spring and plunger device engaging the cam in a position out of phase with the pumping element and arranged to apply counterbalancing torques that prevent the application of torque reversals to the gear and thus avoid gear oscillation and chatter.