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. 05, 1978
Filed:
Sep. 06, 1974
Applicant:
Inventors:
Shairyl I Pearce, East Peoria, IL (US);
Sidney J Audiffred, Washington, IL (US);
Assignee:
Caterpillar Tractor Co., Peoria, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
F16H / ; F16D / ;
U.S. Cl.
CPC ...
74753 ; 192 8713 ;
Abstract
A safety valve includes a movable piston which functions to prevent actuation of fluid operated drive conditioning clutches of a vehicle transmission unless the selector valve means are passed through a neutral position. Such safety valve spool also acts as a load piston for a pressure modulating relief valve of the system.