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:
Nov. 09, 1976
Filed:
Feb. 10, 1975
Charles E Holzinger, Peoria, IL (US);
William W Blake, Kewanee, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
A hydraulic transmission control circuit includes a hydraulically responsive modulating valve for modulating a first fluid pressure and a differential valve for establishing a second fluid pressure communicated to a master clutch, the control circuit also including a manually controlled modulating valve for precisely adjusting the second pressure and for selectively adjusting the first fluid pressure during regulation of the second fluid pressure, the manual modulating valve also being adapted for selectively communicating the hydraulically responsive modulating valve with a drain in order to assure a proper rate of modulation for both the first and second fluid pressures.