Patent ID: 8313071

Claim:
A micro-adjustable supporting device comprising: a fixed unit including a mounting seat; a movable unit including a rotating assembly disposed rotatably in said mounting seat and rotatable about an axis, and a bottom seat assembly disposed under said mounting seat and rotatable about said axis; and an adjusting unit including a pair of spaced-apart first and second tilt-adjusting elements, and an angle-adjusting element, each of said first and second tilt-adjusting elements extending through said rotating assembly to connect with said bottom seat assembly and being operable to move relative to said rotating assembly in a direction parallel to said axis to thereby adjust a tilt angle of said bottom seat assembly relative to said axis, said angle-adjusting element being disposed movably on said mounting seat and connected to said rotating assembly, said angle-adjusting element being operable to move relative to said mounting seat to rotate said rotating assembly and said bottom seat assembly about said axis; wherein said fixed unit further includes a connecting shaft assembly and a fixing member, said connecting shaft assembly including a shaft extending through said bottom seat assembly, said mounting seat, and said rotating assembly and connected to said fixing member, and a resilient element sleeved on said shaft for providing a biasing force to press said rotating assembly and said bottom seat assembly against said mounting seat, further comprising a locking unit operable to change the biasing force so as to convert said movable unit between a fully locked state, where said rotating assembly and said bottom seat assembly are locked on said mounting seat, and a released state, where said rotating assembly and said bottom seat assembly are released from said mounting seat and where said adjusting unit is operable to either rotate said bottom seat assembly about said axis relative to said mounting seat or adjust the tilt angle of said bottom seat assembly relative to said axis wherein said resilient element is disposed between said fixing member and said rotating assembly, said shaft extending through said locking unit, said locking unit being clamped between said resilient element and said rotating assembly, wherein said locking unit includes a rotatable controller and a spacer clamped between said controller and said rotating assembly, said spacer being configured as a plate and having a top surface, said top surface having a concave portion formed with an inclined surface portion, said controller including a main body permitting extension of said shaft therethrough, a push lever extending from said main body, and an inclined projection formed on said main body and in slidable contact with said inclined surface portion of said spacer such that, through operation of said push lever, said inclined projection is slidable on said inclined surface portion to thereby convert said movable unit between the fully locked state and the released state.