| 摘要 |
PURPOSE: To provide a truck capable of easily passing over a stepped part by closing the cock of a cylinder connected to an auxiliary wheel provided between a front wheel and a rear wheel to make the cylinder airtight, supporting a load, and opening the cock to make the cylinder expansible and contractible. CONSTITUTION: When the cock of a cylinder 5 is opened, and a handle 3 is held to lift up the rear wheel side of a truck, the cylinder 5 is extended. When the cock is closed, the cylinder 5 is made airtight, and the truck is laid into a seesaw state having an auxiliary wheel 4 in the center as a fulcrum. When the handle 3 is then pressed, a front wheel 1 is lifted by the seesaw action, and the front wheel 1 can be lifted to a position higher than a stepped part. If the whole truck is advanced in this state, the front wheel 1 can be put on a step. When the cock is thus opened to push the truck, a bar 6 for supporting the auxiliary wheel 4 is touched by the step. Then, the cylinder 5 is contracted, and the auxiliary wheel 4 can get on the step without being caught by the step. When the rear wheel 2 finally reaches near the stepped part, the handle 3 is lifted up to put the rear wheel 2 on the step, and the truck can pass over the stepped part. |
