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:
Apr. 12, 2011
Filed:
Apr. 18, 2007
Kazuyuki Ino, Sakuragawa, JP;
Katsumi Ueno, Kasumigaura, JP;
Kazuyuki Ino, Sakuragawa, JP;
Katsumi Ueno, Kasumigaura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A pressure selector valve () is provided between a hydraulic motor () and a directional control valve () to connect one of the main conduits (A), (B) on a high pressure side to a high pressure conduit () while connecting the other of the main conduits on a low pressure side to a low pressure conduit (). As an inertial body approaches a stop position, a spool valve () is switched to an open position (e), bringing a branch passage (A) of the high pressure conduit () into communication with the low pressure conduit. When the pressure difference between the main conduits becomes small, the pressure selector valve is automatically returned to a neutral position to cut off communication between the main conduits, suppressing a reversing movement of the hydraulic motor so that an inertial body can be brought to a stop smoothly.