| CPC A47G 33/12 (2013.01) [A47G 2033/122 (2013.01)] | 5 Claims |
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1. A three-joint linkage lifting device with built-in chain for Christmas tree, comprising a base and a bracket fixed on the base, wherein the bracket comprises an outer tube, a middle tube, an inner tube, an upper fixing sleeve for the outer tube, an upper fixing sleeve for the middle tube, and a lower fixing sleeve for the inner tube, an electric lifting assembly, and a sliding hoisting rope, wherein the outer tube, the middle tube, and the inner tube are all hollow rods, a bottom of the outer tube is fixed on the base, and the upper fixing sleeve of the outer tube is fixed on a top end of the outer tube, the middle tube passes through the upper fixing sleeve for the outer tube and is slidably fitted in a central cavity of the outer tube, the upper fixing sleeve for the middle tube is fixed on a top end of the middle tube, and the inner tube passes through the upper fixing sleeve for the middle tube and is slidably fitted in a central cavity of the middle tube, and the lower fixing sleeve for the inner tube is fixed at a lower end of the inner tube and is slidably arranged on an inner side of an inner wall of the cavity of the middle tube;
a power part of the electric lifting assembly is fixed on the inside of the bottom of the outer tube, a lifting stroke part of the electric lifting assembly extends into the inside of the inner tube, and a bottom of the middle tube is fixedly connected to the lifting stroke part of the electric lifting assembly, and the electric lifting assembly is electrically connected to an external control power supply system;
one end of the sliding hoisting rope is fixed at a bottom of the electric lifting assembly, and the other end passes through a top end of the electric lifting assembly and is folded back and fixed on middle and lower inner wall of the inner tube after being resisted.
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