Title:
HYDRAULIC CIRCUIT OF WORKING MACHINE
Document Type and Number:
Japanese Patent JP3776213
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide the hydraulic circuit of a working machine capable of surely stopping a lifting cylinder at the time when an extension and contraction cylinder is operated.
SOLUTION: The selector port B of a directional control valve 24 is connected to the port F of a rotary joint 26 by a pipe passage 34, and the port I of the rotary joint 26 communicating with the port F is connected to a rod side fluid chamber of an extension and contraction cylinder 13 by a pipe passage 37. The port J of the rotary joint 26 communicating with the port F is connected to the rod side fluid chamber of a lifting cylinder 19 by a pipe passage 38, and a sequence valve 41 for being opened at prescribed chamber in the pipe passage 38 is provided. Outflow of working fluid for the change-over port B of a directional control valve 24 from the fluid chamber of the lifting cylinder 19 at the time when the inside pressure of the rod side fluid chamber of the extension and contraction cylinder 13 is released is prevented by the sequence valve 41.
Inventors:
Katsumi Nakano
Application Number:
JP23700497A
Publication Date:
May 17, 2006
Filing Date:
September 02, 1997
Export Citation:
Assignee:
Ishikawajima Construction Machinery Co., Ltd.
International Classes:
E02F9/22; F15B11/028; (IPC1-7): E02F9/22; F15B11/028
Domestic Patent References:
| JP5331877A | ||||
| JP9032044A |
Attorney, Agent or Firm:
Tsunemitsu Yamada
Seiichi Otsuka
Seiichi Otsuka
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