Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Reexamination Certificate
2008-04-22
2008-04-22
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
C318S638000, C318S639000, C318S799000, C318S461000, C318S798000, C318S823000
Reexamination Certificate
active
07362071
ABSTRACT:
In an electric rotary excavator (construction machine)1, when earth pressure acts on a rotary body4in an opposite direction to an instructed direction of a lever, a control-system changing means150of a rotation control device100increases a torque output of an electric motor5that drives the rotary body4. Accordingly, the torque output can properly react against the acting earth pressure, thereby preventing the rotary body from continuing to be rotated in the opposite direction. Therefore, even when the earth pressure becomes large, the work will not be affected. In addition, when the rotary body is rotated on a slope, the rotary body can be prevented from being rotated back greatly due to the weights of the boom and the arm.
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patent: 2005/0253542 (2005-11-01), Sugano et al.
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Kawaguchi Tadashi
Morinaga Jun
Frishauf Holtz Goodman & Chick P.C.
Komatsu Ltd.
Leykin Rita
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