Construction machine

Details Construction machine Construction machine

2004-06-10

2008-10-21

Rivell, John (Department: 3753)

Fluid handling

With casing, support, protector or static constructional...

Vehicle

C137S625650

Reexamination Certificate

active

07438091

ABSTRACT:
The present invention relates to a construction machine having a working oil tank and a switching valve to open/close the pilot line of the hydraulic pressure control system, the return oil from the switching valve being put back to the tank at the bottom through a return pipe, wherein a drain pipe is provided at a portion of the return pipe lower than the tank, while a plug for opening/closing the drain pipe at the outlet thereof, the oil in the working oil tank being discharged through the return pipe in a case where the outlet is opened by the plug. This allows the simplification of the configuration of drain passage as well as the improvement of the efficiency of draining works.

REFERENCES:
patent: 3902735 (1975-09-01), Bertram et al.
patent: 4275902 (1981-06-01), Teja
patent: 4833798 (1989-05-01), Ehrich
patent: 6581506 (2003-06-01), Shimada
patent: 2006/0141230 (2006-06-01), Miyoshi et al.
patent: 2006/0151230 (2006-07-01), Tatsuno et al.
patent: 0 848 113 (1998-06-01), None
patent: 2002-81093 (2002-03-01), None
Patent Abstracts of Japan, JP 08-145003, Jun. 4, 1996.
Patent Abstracts of Japan, JP 2002-081093, Mar. 22, 2002.

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