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. 24, 1998
Filed:
Mar. 26, 1997
Shin Caterpillar Mitsubishi Ltd., Tokyo, JP;
Abstract
A hydraulic actuator operation controller is shown to make it possible to easily change the operation speeds of a hydraulic actuator for a control input of an operating instrument. A signal input from a control input detection device for detecting the control input of an operating lever is converted according to a logical function by a signal conversion unit. The signal conversion unit increases or decreases the signal in magnitude and outputs the converted signal to a pump control device. The pump control device outputs an instruction to a capacity change device such as an electromagnetic proportional control valve connected to a hydraulic pump. The converted signal is also provided to a valve control device for outputting an instruction to a valve opening-degree control device such as electromagnetic proportional control valves connected to a control valve.