Manual control mechanism for lift unit

Details Manual control mechanism for lift unit Manual control mechanism for lift unit

2005-02-15

2005-02-15

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Systems

Multi-way valve unit

C091S389000

Reexamination Certificate

active

06854483

ABSTRACT:
A manual control mechanism for a lift unit having a lift arm and a hydraulic cylinder for lifting the lift arm up and down. The mechanism includes a control valve configured as a three-position switchover valve for selectively providing lowering, neutral and elevating conditions according to a spool position for controlling movement of the hydraulic cylinder, a lift lever for manually operating the control valve and an operational path for guiding operational displacement of the lift lever. The operational path includes an inching operational path for operating the hydraulic cylinder at a creeping speed by slightly opening a port of the control valve and a main operational path for operating the control valve over an entire stroke range thereof. An operational feel when the lift lever is operationally displaced along the inching operational path is different from an operational feel when the lift lever is operationally displaced along the main operational path.

REFERENCES:
patent: 2001-169607 (2001-06-01), None

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