Land vehicles: dumping – Tilting – Operating mechanism
Reexamination Certificate
2006-08-30
2010-06-22
Engle, Patricia L (Department: 3612)
Land vehicles: dumping
Tilting
Operating mechanism
C298S02200C
Reexamination Certificate
active
07740323
ABSTRACT:
In a hydraulic drive device for vertical pivoting movement of a load carrying platform, a first directional control valve has only three switchover positions, including a neutral position relating to operation of stopping and holding a load carrying platform, a switching position relating to operation of lifting the load carrying platform, and a switch over position relating to operation of forced lowering of the load carrying platform. A second directional control valve has only three switchover positions, including a neutral position, a switching position, and a switchover position relating to operation of allowing the load carrying platform to fall by its own weight. The device includes a first on-off valve, a second on-off valve, and a third on-off valve that are proportional control solenoid valves for switching an appropriate one of the first and second directional control valves.
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International Search Report dated Nov. 28, 2006 w/English translation (four (4) pages).
Fushiki Michio
Kaneko Satoru
Tanaka Yasuo
Yagyu Takashi
Yasuda Tomohiko
Crowell & Moring LLP
Engle Patricia L
Hitachi Construction Machinery Co. Ltd.
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