Title:
CONSTRUCTION MACHINERY
Document Type and Number:
Japanese Patent JP3952994
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide construction machinery capable of simplifying the constitution of a drain passage and enhancing the efficiency of draining work.
SOLUTION: The construction machinery have a hydraulic tank 5, a changeover valve 7 opening/closing a pilot line of a hydraulic control system controlling actuation of machinery. The construction machinery is constituted so that the return oil from the changeover valve 7 is returned from the bottom of the hydraulic tank 5. A drain pipe 7g is branched in a position disposed lower than the hydraulic tank 5 in the return pipe 10. A plug 7h opening/closing the drain pipe 7g is installed at the outlet of the drain pipe 7g. When the outlet is opened by the plug 7h, the oil in the hydraulic tank 5 can be discharged through the return pipe 10.
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Inventors:
Masayuki Murakami
Application Number:
JP2003169600A
Publication Date:
August 01, 2007
Filing Date:
June 13, 2003
Export Citation:
Assignee:
Kobelco Construction Machinery Co., Ltd.
International Classes:
E02F9/00; B66C13/00; B66C15/00; E02F9/08; E02F9/22; F15B1/26; F15B21/04; (IPC1-7): E02F9/00; B66C13/00; B66C15/00
Domestic Patent References:
| JP2001271378A | ||||
| JP2002155543A | ||||
| JP2000274401A | ||||
| JP2002054607A | ||||
| JP2002081093A |
Attorney, Agent or Firm:
Etsushi Kotani
Kyuichi Ueki
Muramatsu Toshiro
Kyuichi Ueki
Muramatsu Toshiro