Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1997-06-11
2000-04-18
Ryznic, John E.
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60446, 60426, F15B 1302
Patent
active
060500905
ABSTRACT:
Pressure sensors sense a pilot pressure Pa corresponding to the amount of boom raising operation of a boom operation lever and a pilot pressure Pb corresponding to the amount of arm pulling operation of an arm operation lever. When the condition of Pa>Pb is met during the horizontal pulling operation, the rate of supply of the working fluid to an arm actuating cylinder is reduced to a rate corresponding to the amount of operation of the operation lever. Conversely, when the condition Pa<Pb is met, the rate of supply of the working fluid to the boom actuating cylinder 5 is reduced to a rate corresponding to the amount of operation of the operating lever. Horizontal pulling operation for levelling the ground can be conducted without requiring high level of skill. The horizontal pulling work can be done easily and smoothly, while preventing the bucket from cutting into the ground and from floating above the ground.
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Kabushiki Kaisha Kobe Seiko Sho
Ryznic John E.
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