| 摘要 |
A lifter includes a beam tiltably secured on top of an elevator for supporting an object to be elevated. A base is secured on top of the elevator, and a seat secured to the beam and having one end rotatably secured to the base with a shaft. A bracket and a spring may resiliently support the shaft in the seat. A plate is secured on the seat, a board secured to the beam and rotatably secured on the plate, and a spring biased pin may position the board to the plate at the required angular position. One or more posts and arms may be attached to the beam for supporting the object.
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