retractable awning Oct 19

The retractable awning uses the parallelogram variable structure and hinges to achieve expansion and contraction. It is a hinged four-bar mechanism, which belongs to a double-crank mechanism according to the condition of the crank. The entrance to the building and the upper part of the balcony on the top floor are horizontal members used to block rain and protect the outer door from rain erosion. Canopy beam is a typical bending member

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