| 摘要 |
PURPOSE:To permit the drive by a motor having the equal power to the grounded pressure by installing a spring which extends, when a driving wheel shifts to the upper accommodation position, and is compressed and generates the grounded pressure for the driving wheel, when the driving wheel is shifted to the lower traveling position, between a vertical movement plate and a base seat part. CONSTITUTION:Between the vertical movement plate 13 and the base seat part 2 of a self traveling type dolly 1 which is shifted on a floor surface 52 by a plurality of driven wheels 8 arranged on the left and right sides in the vertical direction, a spring 66 which is extended, when driving wheels 31 - 34 shift to the upper accommodation positions, and is compressed and generates the grounded pressure for the driving wheels 31 - 34, when the driving wheels are shifted to the lower traveling positions, is installed. This spring 66 is used for generating the grounded pressure for the compression driving wheels 31 - 34 by a motor, and each of the driving wheels 31 - 34 is strongly grounded by the pressure of the compression spring 66. Accordingly, the drive by a small- sized motor having the equal power to the grounded pressure is permitted. |
