Hydraulic circuit for boom cylinder combination having float...

Details Hydraulic circuit for boom cylinder combination having float... Hydraulic circuit for boom cylinder combination having float...

2005-05-17

2005-05-17

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of...

C091S436000

Reexamination Certificate

active

06892535

ABSTRACT:
The present invention relates to a hydraulic circuit for a boom cylinder combination having a float function which is capable of implementing a leveling work in such a manner that a leveling work is performed by lowering a boom based on its self-weight without using an operation oil discharged from a hydraulic pump using an excavator during a leveling work which includes a first inner path which is formed in one side of the boom cylinder combining spool and connects a hydraulic pump and a boom cylinder large chamber in a switching mode, a second inner path which is formed in the other side of the boom cylinder combining spool and connects an operation oil from the hydraulic pump to a hydraulic tank in a switching mode, and a third inner path which is formed in the other side of the boom cylinder combining spool and combines the operation oils from the small chamber and large chamber of the boom cylinder in a switching mode and connects the same to the hydraulic tank.

REFERENCES:
patent: 4522109 (1985-06-01), Marchi et al.
patent: 5791226 (1998-08-01), Chung et al.
patent: 5890303 (1999-04-01), Ishikawa et al.
patent: 20030121184 (2003-07-01), Yoshino et al.
patent: 0 389 136 (1990-09-01), None

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