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. 18, 1986
Filed:
Aug. 28, 1980
Yusuke Imada, Ikejiri Aza Ishinoki, Itami-shi, Hyogo-ken, JP;
Isamu Hiroe, Ikejiri Aza Ishinoki, Itami-shi, Hyogo-ken, JP;
Tomoyuki Higuchi, Ikejiri Aza Ishinoki, Itami-shi, Hyogo-ken, JP;
Seiichi Kato, Ikejiri Aza Ishinoki, Itami-shi, Hyogo-ken, JP;
Masahiro Tanino, Ikejiri Aza Ishinoki, Itami-shi, Hyogo-ken, JP;
Other;
Abstract
A hydraulic control circuit system comprises first and second double-acting cylinders, a hydraulic pump for supplying the double-acting cylinders with pressure oil, and directional control valves respectively associated with the cylinders for controlling the supply of pressure oil to the latter. The hydraulic control circuit system has a circuit for independently operating the individual cylinders and also a circuit for causing the rod advancing and retracting actions of the first cylinder to be followed by the rod advancing and retracting actions of the second cylinder. The system is applied to the hydraulic control circuit of, e.g., a front loader for controlling a hydraulic cylinder used for lifting and lowering the loader arm and another hydraulic cylinder used for turning the bucket pivotally connected to the free end of the arm. In that case, the system ensures that the upward and downward movements of the arm are followed by the turning of the bucket so as to prevent the load in the bucket from spilling, which would be otherwise caused by the tilting of the bucket with respect to the horizontal.