Patent ID: 6237705
Filing Date: 2001-05-29
Classification: A61G,B66B

Abstract:
A self-propelled stairs moving unit, capable of traveling on stairs in such a manner that the moving unit moves up and down the stairs by engaging a rail means provided on a side portion of the stairs and having the same inclination of the stairs, the self-propelled stairs moving unit comprising:a self-propelled portion having a front crawler traveling unit and a rear crawler traveling unit respectively provided on right and left, and a driving source for driving said crawler traveling units,a right and a left support frame, each for rotatably connecting said front crawler unit and said rear crawler unit on right and left respectively;a front rotatable connecting shaft connecting said right and left front crawler traveling units;a pallet supported by said front rotatable connecting shaft and that is free to oscillate at its rear end with said front connecting shaft as its center of oscillation; anda horizontal holding means for holding said pallet to be level in spite of inclination of said self-propelled portion.