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:
Dec. 26, 1995
Filed:
Sep. 28, 1994
Tomoaki Ono, Tokyo, JP;
Shoji Tozawa, Tokyo, JP;
Satoshi Fujii, Tokyo, JP;
Koichi Harada, Tokyo, JP;
Makoto Sakai, Tokyo, JP;
Shin Caterpillar Mitsubishi Ltd., Tokyo, JP;
Abstract
A valve control unit includes a main hydraulic oil circuit and a pilot oil circuit. The main circuit includes a main pump, a main valve downstream from the main pump, and a hydraulic actuator downstream from the main valve. The pilot oil circuit circulates pressurized pilot oil to control the main valve and includes a pilot oil pump, an automatic control switching valve downstream from the pilot oil pump, a manual limit switching valve downstream from the pilot oil pump, a manual control switching valve downstream from the manual limit switching valve, and a pilot oil chamber downstream from the manual control switching valve. The pilot oil chamber is located near the main valve such that the flow of pressurized pilot oil moves the main valve.