Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1988-07-15
1989-06-13
Werner, Frank E.
Material or article handling
Vertically swinging load support
Shovel or fork type
414694, 60429, 60452, F16D 3102
Patent
active
048387568
ABSTRACT:
An excavator has a number of different hydraulically powered functions that are controlled by a closed center hydraulic system that features a pair of variable displacement, engine driving hydraulic pumps, the displacement of which is responsive to the demands of the system. The flow to the various hydraulic motors is controlled by pilot operated load sensing control valves that direct fluid pressure to a load sensing line when one of the hydraulic motors in the system is being operated. The load sensing line is connected to the control system of the pumps to place the pumps in stroke when a flow of pressurized fluid is required. The flow of the load sensing pressure to the controls for one of the pumps can be optionally disconnected to place said pump in a standby condition and thereby reduce the flow capacity of the hydraulic system at the option of the operator.
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Johnson Steven H.
Williams Lary L.
Deere & Company
Hienz William M.
Werner Frank E.
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