Universal four-legged stand for books, laptop and other electronics

摘要

The basic structure of the stand consists of four vertical bars (2) and one horizontal bar (1), the vertical bars (2) being connected to the horizontal bar (1) by swivel joints (4) or ball joints (15), the positions of which are locked by levers. (6) or screws (5), and hoops (3,24) are slid on the horizontal bar, on which the vices (7) of the holders are clamped.