| 摘要 |
It is an integrated pole unit that is connected to a patio umbrella canopy that allows it to be raised by a pump (foot, hand or low psi) and lowered by releasing air via an air pressure valve. The external umbrella pole is hollow with a slit at the top and contains an "internal pole mechanism" with a metal insert attached to the base of the canopy and moves up the slit with increased air pressure in the pole raising the umbrella canopy. There is an air pressure valve that, when closed, keeps the umbrella canopy in the full open position, when open, releases the air, resulting in the umbrella canopy closing automatically in a slow and controlled manner.
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