Circuit board assembly mechanism

An input/output switch box enclosing a stacked circuit board structure for communicating among a plurality of computer peripheral devices, the input/output switch box comprising:

• a first circuit board having a plurality of first input/output ports for coupling with the computer peripheral devices, the first circuit board further having a first hole adjacent to a first edge of the first circuit board and a second hole adjacent to a second edge opposite to the first edge of the first circuit board;
• a second circuit board having a third hole and a plurality of the second input/output ports for coupling with the computer peripheral devices;
• a base for housing the first circuit board and the second circuit board, further comprising:
• a bottom plate having a fourth hole corresponding to the third hole and a pillar extruding from the bottom plate at a position corresponding to the first hole, the second circuit board being mounted on the bottom plate by inserting a first fixer through the fourth hole and the third hole, the first circuit board being mounted on the pillar by inserting a second fixer through the first hole into the pillar, being suspended above the bottom plate,
• a side plate shaped by bending a wing of the bottom plate, having a plurality of openings for exposing the first input/output ports and the second input/output ports, and
• a boundary plate shaped by bending the side plate inner toward the base, having a split at a position corresponding to the second hole;
• and
• a connecting bracket for connecting the first circuit board with the side plate of the base, further comprising:
• a first strip having a foot hole for fixing the connecting bracket with the first circuit board by inserting a third fixer through the second hole and the foot hole, and
• a second strip bent from the first strip, having a flange corresponding to the split for restricting the connecting bracket in the boundary plate by inserting the flange into the split;
• wherein the first circuit is fixed by the pillar and connecting bracket, thereby suspending above the second circuit board forming a stacked circuit board structure within the base.