Working machine, and quick load-dropping method

Details Working machine, and quick load-dropping method Working machine, and quick load-dropping method

2007-04-04

2011-11-01

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Inlet fluid supplemented by controlled fluid pressurized in...

C091S448000

Reexamination Certificate

active

08047121

ABSTRACT:
A tank16and a main hydraulic pump17are connected to head side actuator chambers13and rod side actuator chambers14of hydraulic actuators12via conduits21, 22. A direction control valve18and a quick drop valve36are connected to the conduits21, 22. A hydraulic circuit is provided with an electromagnetic switch valve42, which switches the quick drop valve36from a non-quick drop position37to a quick drop position38. When switching the direction control valve18from a neutral position23to a lowering operation position25, if the manipulation speed of a manipulation lever33exceeds a criteria speed, an excitation signal is output from a control device32to an electromagnetic switch valve42to quickly drop a blade11, and the quick drop valve36is switched from the non-quick drop position37to the quick drop position38.

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