| 摘要 |
The apparatus includes a frame having a pair of sleeves adjacent opposite sides thereof for receiving the legs of inverted, generally U-shaped bars. Lifting tubes are provided along opposite sides of the frame for receiving a lifting lever. By applying the lifting lever alternately to opposite sides of the frame, the frame can be lifted into an elevated position, with cooperating ratchets and ratchet teeth along the frame and legs cooperating to prevent slippage of the frame in a downward direction. Casters may be provided the frame for moving the frame in a horizontal direction.
|
