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:
Oct. 07, 1986
Filed:
Feb. 05, 1985
Yoshikazu Nagahara, Yokohama, JP;
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JP;
Abstract
A fluid pressure control circuit for operating a bidirectional hydraulic motor comprises first and second main conduits for selectively supplying the pressurized fluid delivered by a main hydraulic pump through a pilot fluid pressure operated three-position directional control valve and via a brake valve device into first and second ports of the bidirectional hydraulic motor; two pilot fluid supply conduits located in parallel relationship with each other for selectively supplying the pressurized fluid delivered by an auxiliary hydraulic pump as a pilot fluid pressure through a three-position directional control valve into the left and right pressure receiving portions of said pilot fluid pressure operated three-position directional control valve; a conduit for selectively supplying the pressurized fluid delivered by the auxiliary hydraulic motor through a solenoid operated control valve into the pressure chamber of a gyratory brake device; and a conduit for short-circuiting said two pilot fluid supply conduits by means of a solenoid operated neutral valve. The solenoid of said solenoid operated control valve and that of said solenoid operated neutral valve are electrically connected so as to be energized and deenergized in synchronous relationship.