Motors: expansible chamber type – Relatively movable working members with one having motive... – Synchronizing in response to sensed difference in positions
Patent
1982-02-22
1985-02-12
Garrett, Robert E.
Motors: expansible chamber type
Relatively movable working members with one having motive...
Synchronizing in response to sensed difference in positions
91189R, 91453, 91522, 91529, 92137, 212153, 212160, F15B 1122
Patent
active
044983700
ABSTRACT:
A hydraulic system for synchronizing telescoping sections of a crane boom comprising a fixed section and second, third and fourth sections that can be extended and retracted, hydraulic cylinders between the sections for extending and retracting the adjacent sections relative to one another and a control valve for each cylinder. Cables are provided between the sections such that a non-uniformity in movement of the sections causes a change in displacement of the cables which is sensed by position sensing devices to provide a hydraulic pilot signal for modifying flow of hydraulic fluid to the cylinders.
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Breeden Robert H.
Taylor Henry D.
Garrett Robert E.
Meyer Richard S.
Vickers Incorporated
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