| 摘要 |
PURPOSE:To enable to tow and couple a trailer to a tractor while a carrier lift is mounted by elevationally movably supporting a mast which elevationally movably supports the carrier lift on the tractor at three-point supporting unit. CONSTITUTION:Masts 13, 13' are elevationally movably supported through three- point supporting unit having an upper ring 7 and two lower rings 3, 3' at the rear of a body 2, and a lift 30 which mounts a carrier 41 on the masts 13, 13' is elevationally movably supported through a chain 31 which winds a guide wheel 32. When a trailer 49 is coupled and towed, lower rings 3, 3' are upwardly moved through an arm 33 and a rod 34 to move upwardly the mask 13, 13', and a pin 51 of a trailer 49 is connected to a hitch 50 of a supporting bracket 20 under the carrier 41 which is thus moved upwardly. |
