Patent ID: 8047730

Claim:
A supporting device comprising: a supporting base defining two sliding channels along the longitudinal direction of the supporting base; a first supporting arm comprising a first pivoting end and a first sliding end, the first sliding end of the first supporting arm being slidably engaged in the sliding channels; a second supporting arm comprising a second pivoting end and a second sliding end, the second sliding end of the second supporting arm being slidably engaged in the sliding channels, the first pivoting end and the second pivoting end being pivotally coupled to each other; and wherein each of the first and second supporting arms is an elongated plate and further comprises an engaging surface, a cutout defined in the engaging surface at the first and second pivoting ends, and a through hole at each of the first and second pivoting ends where the cutout is formed, the through holes of the first and second supporting arms are aligned with each other, and the first and second supporting arms are rotatably connected with each other via a threaded bolt passing through the through holes of the first and second supporting arms.