Mechanism for adjusting pivot angle of socket of socket wrench

A socket wrench comprising:

• a handle comprising a bifurcated head including a blind hole spaced from bottom and a channel having both ends communicating with the blind hole and a space defined by the head respectively;
• a spring depressible trigger pin disposed in the blind hole and comprising a first inclined surface, a second inclined surface, and a straight line joining the first and second inclined surfaces;
• a lock pin slidably disposed in the channel and comprising a first garbled member at one end, the first garbled member including a tip edge, and a second garbled member at the other end, the second garbled member having a tip edge urged against the second inclined surface;
• and
• a socket comprising a projection pivotably disposed in the head of the handle, the projection including an arcuate toothed section being in gear engagement with the tip edge of the first garbled member,
• whereby pressing the trigger pin to slide the tip edge of the second garbled member along the first inclined surface until being stopped at the straight line will disengage the tip edge of the first garbled member from the toothed section.