Abstract A portable ultrasound scanning system has a main body to store various functional modules such as mother board & scan converter module, CRT & TVM board module, hard disk drive module, beam former module and power supply module that are connected to top or side or backside cover panels through a hinge mechanism. The hinge mechanism consists of a thin sheet fastener and a hole provided at two different chassis members respectively. A mounting screw is inserted into the hole to secure the thin sheet fastener and the two chassis members. 8 Claims, 4 Drawing Sheets.