| 摘要 |
A stepwise powerful suction device includes suction holders, suction elements, resilient elements, a support frame, and rotary knobs. The support frame and the three suction holders are integrally formed together. A portion of the support frame forms a handle. Each suction element forms an upright post extending through the respective resilient element and suction holder. Each suction holder forms a multi-step stepwise recess, and each rotary knob has a handgrip that forms a multi-step stepwise projection overlappingly engaging the multi-step stepwise recess and including a safety button, a spacer ring, and a bolt extending through the handgrip of the rotary knob to engage an inner-threaded hole defined in the respective suction element. Each suction holder forms a stop, and the handgrip of the respective rotary knob forms a counterpart raised portion. When the handgrip of the rotary knob is rotated from a released position to first, second, and third engaging position, respective suction forces, which are sequentially of small, intermediate, and large magnitudes, are induced to effect various sucking operations on plates of different materials and thicknesses.
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