Adjustable rotation base

A base for an outdoor umbrella which comprises a supporting shaft, comprising:

• a base housing having a bottom side, an upper side for coupling with said supporting shaft to support said outdoor umbrella in an upright manner;
• a plurality of transportation wheels spacedly provided at said base housing;
• and a transportation arrangement provided at said base housing to operate said base between an idle position and a transportation position, wherein at said idle position, said bottom side of said base housing is arranged for standing on a ground surface, wherein at said transportation position, said transportation wheels are concurrently reached said ground surface and are located below said bottom side of said base housing such that said transportation wheels reach said ground surface for transporting said outdoor umbrella, wherein said transportation arrangement comprises a driving unit provided in said base housing to uplift said base housing at a predetermined elevation until said transportation wheels are located below said bottom side of said base housing, wherein said driving unit comprises an adjustment assembly provided in said base housing for incrementally lowering said transportation wheels and a manual actuation unit operatively coupled with said adjustment assembly for allowing a user to actuate said adjustment assembly to uplift said base housing, wherein said manual actuation unit comprises a handle member operatively linked to said adjustment assembly for allowing the user rotating said handle member to actuate said adjustment assembly, wherein when said handle member is rotated, said base housing is uplifted, wherein said adjustment assembly comprises a gear structure operatively coupled with said transportation wheels, wherein when said handle member is rotated, said transportation wheels is are concurrently lowered through said gear structure and said base housing is uplifted afterwards.