Abstract: A support apparatus has a positioning disc mounted on a sucking disc. An operation disc is mounted on the positioning disc and has a receiving hole. Two bevel ribs are arc-shaped, are formed on and protrude along an inner wall of the receiving hole. The sucking disc has a column mounted through the positioning disc and the receiving hole of the operation disc. A pin is mounted through the column, with two ends of the pin protruding beyond the column and abutting against the two bevel ribs of the operation disc. By rotating the operation disc to axially move the pin upon abutting against the bevel ribs to pull the sucking disc, the sucking disc can be adhered to a tablet PC. A pivotable stand connected to the positioning disc can be rested on a desk to facilitate viewing at any angle.

Abstract: A support apparatus has a positioning disc mounted on a sucking disc. An operation disc is mounted on the positioning disc and has a receiving hole. Two bevel ribs are arc-shaped, are formed on and protrude along an inner wall of the receiving hole. The sucking disc has a column mounted through the positioning disc and the receiving hole of the operation disc. A pin is mounted through the column with two ends of the pin protruding beyond the column and abutting against the two bevel ribs of the operation disc. By rotating the operation disc to axially move the pin upon abutting against the bevel ribs so as to pull the sucking disc, the sucking disc can be adhered to a tablet PC. A pivotable stand connected to the positioning disc can be rested on a desk to facilitate viewing at any angle.

Abstract: A heat sink mounting structure is constructed to include a bottom rack fixedly fastened to a motherboard by screws to hold a heat sink, two fasteners adapted for securing the heat sink to the bottom rack keeping the heat sink in contact with the CPU at the motherboard, each fastener having a double-end hook mounted in one locating groove of the heat sink and adapted for hooking in retaining holes in corner uprights of the bottom rack, a holding down plate adapted for holding down the double-end hook, and a locking lever pivoted to the double-end hook and adapted for locking the holding down plate.