| 摘要 |
PURPOSE: An auxiliary lifting apparatus of a truck is provided to get on/off smoothly by protruding automatically an auxiliary step outwardly if a driver opens a door, without using a particular apparatus for getting on the truck. CONSTITUTION: A door switch(54) is installed at a door of a truck. If the door is opened, the door switch is turned on, and if the door is closed, the door switch is turned off. A solenoid valve(64) is connected at the door switch, and a surge tank(68) and an outlet(70). The solenoid valve(64) is connected at a cylinder(62) through an up-line(66). Air is supplied from the surge tank to the cylinder(62) through the solenoid valve(64) and the up-line(66), and air exiting at the cylinder is drained to the outlet through the solenoid valve(64) and the up-line(66). A first step and a second step are connected at the cylinder, and are pushed and protruded outwardly by the cylinder if air is supplied at the cylinder.
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