Wheel-type working machine and method of controlling the same

Details Wheel-type working machine and method of controlling the same Wheel-type working machine and method of controlling the same

2006-04-21

2010-06-01

Pezzuto, Robert E (Department: 3671)

Excavating

Ditcher

Condition responsive

C060S446000

Reexamination Certificate

active

07726051

ABSTRACT:
A hydraulic excavator includes: an oil-pressure cut valve for suspending pressure oil supply to a PPC valve; a lock switch for operating the oil-pressure cut valve; and a control device for controlling a switching of the oil-pressure cut valve. The control device includes: a lock-state determining unit that determines a lock state of working equipment by considering the status of the lock switch; a traveling-state determining unit that determines a traveling state of the hydraulic excavator; an alert-issuing controlling unit that issues an alert urging locking of the working equipment; and a relay control unit that actuates the oil-pressure cut valve to suspend the flow of pressure oil. The alert-issuing controlling unit issues the alert and the relay control unit actuates the oil pressure cut valve when the hydraulic excavator is determined to be traveling and the working equipment is determined not to be in the lock state.

REFERENCES:
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patent: 4-237724 (1992-08-01), None
patent: 5-65724 (1993-03-01), None
patent: 2002-285587 (2002-10-01), None
patent: 2003-321852 (2003-11-01), None
patent: 2004-131208 (2004-04-01), None
Notification Concerning Transmittal of International Preliminary Report on Patentability and Written Opinion, Chapter I of the Patent Cooperation Treaty for PCT/JP2006/308408, 6 sheets.

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