Universal security lock for portable electronic devices and engaging mechanism thereof

A universal security lock for portable electronic devices, comprising:

• an engaging mechanism having:
• a base having an engaging direction;
• an expanding rod disposed on the base and being slidable along the engaging direction;
• an end, which is toward the engaging direction, of the expanding rod being defined as an abutting end;
• a width of the abutting end gradually decreasing toward the engaging direction;
• two gripping fingers being elongated;
• each of the gripping fingers having:
• an inner end pivotally connected to the base;
• each of the two inner ends of the two gripping fingers disposed on a respective one of two opposite sides of the expanding rod;
• an inner surface facing toward another one of the gripping fingers;
• an outer surface being opposite to the inner surface;
• and
• an electronic-device-engaging portion protruding from the outer surface and disposed on an outer end of the gripping finger;
• wherein when the expanding rod is moved toward the engaging direction, the abutting end of the expanding rod abuts against the two inner surfaces of the two gripping fingers and drives the two electronic-device-engaging portions to move away from each other gradually;
• and
• wherein the two gripping fingers are respectively defined as a first gripping finger and a second gripping finger;
• the inner surface of the first gripping finger has a first abutting area and a first protrusion;
• the first protrusion protrudes from the first abutting area and extends toward the second gripping finger;
• the abutting end of the expanding rod selectively abuts against the first abutting area or the first protrusion;
• a rod-returning resilient element connected to the expanding rod of the engaging mechanism and driving the expanding rod to move in a direction reverse to the engaging direction;
• a controlling part rotatably disposed in the base of the engaging mechanism;
• the controlling part and the expanding rod arranged along the engaging direction;
• and
• a lock core disposed on the base of the engaging mechanism and connected to the controlling part;
• the lock core having an unlocked status and a locked status;
• in the unlocked status, the lock core being rotatable relative to the base;
• in the locked status, the lock core being unrotatable relative to the base;
• wherein when the controlling part is rotated relative to the base, the expanding rod of the engaging mechanism is driven by rotation of the controlling part to change a position of the expanding rod along the engaging direction, thereby changing a distance between the two electronic-device-engaging portions.