Patent ID: 8534635

Claim:
A support for a portable electrical device, comprising: a base frame including: two through holes; a protrusion formed on an inner surface of the base frame in each through hole; and an L-shaped sliding groove defined in the inner surface in each through hole, the sliding groove including: a guiding groove portion extending in a direction parallel to an axial direction of the through hole; and an engaging groove portion communicating with the guiding groove portion, the engaging groove portion extending along a direction substantially perpendicular to the axial direction of the through hole; a rotatable frame pivotably coupled to the base frame, the rotatable frame including: two first shafts rotatably inserted into the through holes, the first shaft including a circular recess defined in an end face facing the protrusion, and a plurality of inner teeth formed on an internal circumferential sidewall in the recess; an adjusting knob assembly including: an operating knob located outside the through hole; an insertion portion received in the through hole; a guiding rib formed on the insertion portion, the guiding rib being slidable in and along the guiding groove portion and engagable in the engaging groove portion; a second shaft extending from the insertion portion; and a plurality of outer teeth formed on an outer circumferential surface of the second shaft, the second shaft being passable through the protrusion and insertable into the recess with the outer teeth engaged with the respective inner teeth; and a spring element compressed between the protrusion and the insertion portion.