Structure for mounting packages with electronic circuit components on a mounting unit

A mounting structure comprising:

• a mounting unit;
• first connector attached to said mounting unit;
• a pair of guide rails attached to said mounting unit;
• a package having electronic circuit components disposed thereon, said package having at least one second connector at one edge thereof which is engaged with said first connector when inserted into said mounting unit along said pair of guide rails;
• a rod;
• a pair of arms each having first and second ends, said first end of each of said arms being supported on said rod so as to be able to pivot around said rod, said second end of each of said arms being engaged with an edge of said package when said package are mounted to said mounting unit and said arms are pivoted toward said package;
• and
• first contacts provided on opposite edges of said package, said first contacts of said package being disposed adjacent to said one edge having said at least one second connector;
• and
• second contacts provided on said arms, said second contacts being connected to a power supply source, said second contacts respectively coming into contact with said first contacts when said arms are pivoted toward said package, thereby supplying electric power from said power supply source via said first contacts and said second contacts to said electronic components on said package, said electronic components being isolated from said power supply source when said arms are pivoted away from said package, removing said second contacts from contact with said first contacts.