PURPOSE: To achieve safe travel by indicating travellable attitude on a travel attitude input system and informing to the driver thereby preventing erroneous operation of travel attitude.
CONSTITUTION: A coupling state detector 20 will detect whether it is single car or coupled in lateral/longitudinal to light a lamp 21 in a travel attitude input system 3 through a controller 2 and to inform to the driver. Then the travel attitude is provided through a travel attitude input switch 22. Consequently, it is confirmed that the input of travel attitude through said switch 22 is received by the controller 2 or not. A travel pattern is produced from the travel attitude input to calculate the steering angle of shaft roller 5 through the controller 2 thus to rotate a motor 6 through an amplifier 4. Then, a hydraulic exchange valve 14 will telescope a hydraulic cylinder 16 to rotate said roller 5.
IWASAKI YOSHIHARU
SASAKI MASAAKI
