Hoist system counterbalance valve signal shutoff

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 12115897
APP PUB NO 20230017953A1
SERIAL NO

17379745

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A hoist valve assembly for a work machine cylinder includes a main control valve, a counterbalance valve and a counterbalance shutoff valve. A main control valve raise position connects a head end of the cylinder with a pressurized fluid source and a rod end of the cylinder to a low pressure reservoir to extend the cylinder. The counterbalance valve is between the rod end and the main control valve, is biased to a closed position and has an open position connecting the rod end to the low pressure reservoir. Rod end and head end pressure signals apply force to the counterbalance valve toward the open position. The counterbalance shutoff valve is positioned between the head end and the counterbalance valve, and has a normal position to apply the head end pressure signal to the counterbalance valve and a shutoff position that blocks the head end pressure signal from the counterbalance valve.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
CATERPILLAR INC100 NE ADAMS STREET PEORIA IL 61629-9510

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Connolly, John R Clayton, NC 14 114
Junaidi, Aleem Edwards, IL 2 3
Wen, Jun Oro Valley, AZ 25 100

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