Adjustable rotation base

  • US 7,513,479 B2
  • Filed: 05/29/2007
  • Issued: 04/07/2009
  • Est. Priority Date: 05/29/2007
  • Status: Active Grant
First Claim
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1. An adjustable rotation base for supporting an outdoor umbrella having a supporting post on a ground surface, wherein said adjustable rotation base comprises:

  • a base housing having a bottom side, an upper side for coupling with said supporting post to support said outer umbrella in an upright manner, and a receiving cavity indently formed on said bottom side of said base housing, wherein said base housing comprises a stationary unit provided at said bottom side for stationary sitting on the ground surface and a plurality of transferring wheels rotatably supported at said bottom side of said base housing; and

    an transportation arrangement provided at said base housing to operate said base housing between an idle mode and a transportation mode, wherein in said idle mode, said transferring wheels are suspenedly lifted up to define a clearance between said transferring wheels and the ground surface such said base housing is stationary sat on the ground surface via said stationary unit, and in said transportation mode, said stationary unit is upwardly lifted to allow said transferring wheels being sitting on the ground surface, such that said base housing is adapted to be transported on the ground surface via said transferring wheels,wherein said transportation arrangement comprises a plurality of driving units each of which comprises an adjustment assembly mounted in said receiving cavity and a manual actuation unit extended from said adjustment assembly out of said base housing in such a manner that said manual actuation unit is adapted to be manually and selectively operated for driving said adjustment assembly to lift up and lower down said transferring wheels with respect to said base housing,wherein said base housing further comprises a partitioning wall, and has a plurality of seat portions formed as four corner portions of said base housing, wherein said transferring wheels and said driving units are coupled at said corresponding seat portions for selectively operating said base housing between said idle mode and said transportation mode, each of said seat portions being divided into a driving compartment and a control compartment by said partitioning wall, wherein said adjustment assembly and said manual actuation unit are mounted in said driving compartment and said control compartment respectively and communicate with each other through said communication slot of said partitioning wall.

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