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:
Jan. 09, 2001
Filed:
Apr. 21, 1999
Komatsu Ltd., Tokyo, JP;
Abstract
The invention relates to a device whereby irrespective of the magnitude of the load the desired maximum flow QM is fed to the hydraulic actuator which drives the working part, thus allowing the working part to work at the desired speed. The flow rate through the flow rate control valves is controlled so that when the operation means is operated beyond a prescribed operating start position, the hydraulic actuators begin to be driven, the flow fed to the hydraulic actuators attaining a prescribed maximum when the operation means is operated to its maximum operating rate, while the rate of change of the flow fed to the hydraulic actuators reaches a prescribed magnitude for each fixed operating rate of the operation means. The rate of change of the flow rate is altered according to the magnitude of the load.