US Patent 8235336 Vacuum suction base

A vacuum suction base includes a base, a fixing mechanism secured on the base, an adjusting cam, and an adjusting bolt. The base includes a suction piece and a column extending upwardly from the center of the suction piece. The fixing mechanism includes a column housing resisting an edge of the suction piece, and a sleeve connected to the column and defining a through hole. The adjusting cam is rotatably installed in the through hole and partially extends out from the through hole. One end of the adjusting bolt is fixed in the adjusting cam and the other end is engaged in the column.