| 摘要 |
A roller device has a bearing axle and a wheel rotatably mounted to the axle in a roller housing. A lifting device is connected to the axle and wheel and is movable to raise and lower the wheel out of and into a travelling plane. A supporting device is fitted to the lifting device and has a support area lowered onto the travelling plane in response to rotation of the lifting device. The lifting device comprises a pair of eccentric discs which are mounted at both ends of the bearing axle and are connected thereto in a rotationally fixed manner. One of the discs engages in a form locking manner a corresponding recess in a side plate of the supporting device and at least one of the discs has two spaced apart spiked surfaces which can be rotated with the disc about the bearing axle in opposite directions against a stop protrusion on the side plate to thereby raise and lower the wheel. In this manner, in the raise position of the wheel, the supporting device provides stationary support for the roller disc and a load supported thereon by contacting a support surface. In the lower position of the wheel onto the travelling plane, the roller device and load supported thereon are rotatable relative to a supporting surface.
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