초록 ▼

A lift control valve is switched based on the manipulation of a lift lever, so that a lift cylinder extends or retracts to move a fork, supported on a mast, to move up or down. A check valve, which is actuated with a pilot pressure, is placed between the lift control valve and the lift cylinder. A p

A lift control valve is switched based on the manipulation of a lift lever, so that a lift cylinder extends or retracts to move a fork, supported on a mast, to move up or down. A check valve, which is actuated with a pilot pressure, is placed between the lift control valve and the lift cylinder. A pilot pipe led out from a pipe directly coupled to an oil tank is connected to a port of the check valve. A tilt control valve is switched based on the manipulation of a tilt lever, so that a tilt cylinder extends or retracts to tilt the mast. An electromagnetic valve is disposed between the tilt cylinder and the tilt control valve. When values necessary to drive the fork are detected, a controller control the electromagnetic valve based on those values.

대표청구항 ▼

[ What is claimed is:] [1.] A hydraulic control apparatus for an industrial vehicle for tilting a loading attachment supported on a mast by operating operation means, comprising:a hydraulic cylinder for tilting a loading attachment;a changeover valve controlling operation of said hydraulic cylinder;

[ What is claimed is:] [1.] A hydraulic control apparatus for an industrial vehicle for tilting a loading attachment supported on a mast by operating operation means, comprising:a hydraulic cylinder for tilting a loading attachment;a changeover valve controlling operation of said hydraulic cylinder;a fluid passage between the hydraulic cylinder and said changeover valve;an electromagnetic valve placed between said hydraulic cylinder and said changeover valve, along said fluid passage;detection means for detecting a value necessary to manipulate said attachment; andcontrol means for controlling said electromagnetic valve based on said detected value.