Patent ID: 8083190

Claim:
An angular adjustment mechanism comprising: a limiting unit formed with a first guiding channel lying along a first imaginary plane and a second guiding channel lying along a second imaginary plane, wherein said first guiding channel has a bottom wall formed with a plurality of spaced-apart first retention holes while said second guiding channel has a bottom wall formed with a plurality of spaced-apart second retention holes; a lower clamping unit having a U-shaped structure and being received within said first guiding channel along said first imaginary plane; a bottom seat unit disposed below and supporting said lower clamping unit from underneath; an upper clamping unit having an inverted U-shaped structure and being received within said second guiding channel along said second imaginary plane such that said lower and upper clamping units are located at two opposite sides of said limiting unit with said first and second imaginary planes crossing each other perpendicularly; and a top cover unit disposed above and connected to said upper clamping unit; wherein, adjusting position of said lower clamping unit and said limiting unit along said first imaginary plane and said upper clamping unit and said limiting unit along said second imaginary plane results in changing an angular position of said top cover unit relative to said bottom seat unit.