| 摘要 |
PURPOSE:To move up and down a vertical mast in both postures, vertical and slant, by providing the vertical mast with a plurality of rotatably shaft-connected parts for upper and lower links. CONSTITUTION:A vertical mast 16 is installed by an upper link 9 and a lower link 4, and it is moved up and down by means of a lift arm 6. Rotatably shaft- connected parts 18 for the upper link 9 are provided to the vertical mast 16 at more than one places, and their location are optional. Guide plates 70 and 73 are provided with an inserting hole 74, whle a fitting pin 75 goes through both the outer guide plate 73 and the inner guide plate 70 and is fixed by a pin 68. With this contrivance, the vertical mast can be used in either posture, vertical or slant. |
