To improve drivability and storability by turning a driving wheel around a vertical shaft, and installing a braking mechanism selectively controlling it whether being locked at the specified position or not.
An extensive arm 15 is slidden to a fixed arm 13, making an expansion arm 12 into a state of being contracted. A latch pin of an electric locking mechanism is fitted in a hole part of the extensive arm 15, locking it tight. A driving wheel 24 is turned around a vertical shaft 20, storing it at the side of a vehicle body, and it is locked in a storage position by the electric locking mechanism. An expansion motion releases a lockup of a latch pin 17 of the expansion arm 12, pulling up a hoist. The extensive arm 15 is automatically slidden into extension by the force of gravity, thereby holding the extensiveness of the expansion arm 12. The lockup of the vertical shaft 20 is released and the rotative driving wheel 24 is turned around the vertical shaft 20, developing it to the outside of a vehicle body 11, and then this vertical shaft 20 is locked again.
WAKABAYASHI YASUSHI
YOSHIOKA NOBUTO
NAT SPACE DEV AGENCY
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