Heat sink mounting apparatus

A heat sink assembly comprising:

• a printed circuit board with an electronic package mounted on one side thereof;
• a heat sink in thermally contact with the electronic package;
• mounting holes defined in the printed circuit board and the heat sink;
• a locking pin comprising at a first end thereof a plurality of resilient prongs with a slot defined between the prongs, the prongs extending through the mounting holes;
• an expanded head formed at the first end of the locking pin and engaging with the printed circuit board at an opposite side thereof;
• a first spring member attached to the locking pin and resiliently bearing against the heat sink toward the printed circuit board;
• a detent formed on the locking pin;
• and
• an operation member attached to an opposite second end of the locking pin, the operation member comprising:
• a compressing portion capable of compressing the prongs to reduce the diameter of the locking pin at the prongs to a value less than a diameter of the mounting holes when the operation member moves in a first direction which points from the second end to the first end;
• and
• a catch for engaging with the detent to prevent movement of the operation member with respect to the locking pin in an opposite second direction to maintain the diameter of the locking pin at the prongs to be said value.

A mounting apparatus for enhancing contact force between two joint members, comprising:

• a locking pin comprising at least one retractable prong formed at one end thereof, said at least one prong capable of provision of said enhanced contact force between said two joint members in a normal state and of being movable through said two joint members without force enhancement therebetween in a retracted state;
• an operation member attachable to said locking pin, said operation member comprising a compressing portion movable between a first position of restraining said at least one prong of said locking pin from said normal state to said retracted state thereof, and a second position of release of said at least one prong;
• and
• a catch disposed to hold said operation member at said first position in case of movement of said operation member from said second position to said first position.