A crane boom has three telescoping sections which move consistently in a sequential pattern between extended and retracted positions. When extending, the outer section moves first, followed by the middle section. When retracting, the middle section moves first, followed by the outer section. A pair of hydraulic actuators with a series of valves control the extension and retraction of the outer and middle boom sections.
SEQUENTIAL PIGGYBACK CYLINDERS FOR EXTENDABLE BOOM CRANE
2018-09-27
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |
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