Tilt control device for fork lift truck

A tilt control device for a fork lift truck for allowing hydraulic oil received in a tank to flow into one of a rod side oil compartment and a bottom side oil compartment of a tilt cylinder using a hydraulic pump for tilting masts of the fork lift truck, said control device comprising:

• a tilt spool for operating said tilt cylinder;
• a pilot operation type flow rate control valve connected to said hydraulic pump via said tilt spool and adapted to be switched between a fully opened position and a half opened position which are different in opening from each other in response to addition/deletion of a pilot pressure;
• a pilot operation type logic valve disposed between said rod side oil compartment of said tilt cylinder and said flow rate control valve and adapted to permit hydraulic oil to flow into said rod side oil compartment and to be operated so as to open/close relative to hydraulic oil flowing out of said rod side oil compartment in response to the addition/deletion of the pilot pressure;
• and
• an electromagnetic switching valve for controlling the addition/deletion of the pilot pressure to said flow rate control valve and said logic valve,
• said logic valve including a poppet valve disposed between said rod side oil chamber of said tilt cylinder and said flow rate control valve, and a pilot operation type changeover valve for controlling the addition/deletion of the pilot pressure to said poppet valve for opening/closing thereof.