Patent ID: 6469466
Filing Date: 2002-10-22
Classification: B60G

Abstract:
An automatic guided vehicle comprising:a frame having four corners at a bottom portion of said frame; wheels provided to said corners, respectively; a carriage mechanism, including a supporting member provided to said frame to support at least one of said wheels, for changing a vertical position of said at least one of said wheels relative to said frame; a cylinder unit, including: a cylinder tube; a piston movable in the cylinder tube; and covers on both ends of said cylinder tube having ports communicated with the both sides of said piston, respectively, said piston having a rod extending through one of said covers, one of said cylinder tube and said rod being connected to said supporting member of said at least a wheel, the other of said cylinder tube and said rod being connected to said frame; a valve communicated with said ports for allowing said incompressive fluid to enter and exit said cylinder tube through said ports with movement of said piston in an open condition thereof and for inhibiting said incompressive fluid to enter and exit said cylinder tube through said ports in a close condition thereof to lock said vertical position; and control means for controlling said valve in said close condition when said carriage mechanism is stopped.