Quick-release mechanism for hand tool

A quick-release mechanism for a hand tool comprising:

• a center rod for adapting to connect to a tool bit;
• two stop rings respectively sleeved on two ends of the center rod, the two stop rings firmly connected to the center rod;
• a first sleeve sleeved on the center rod, the first sleeve having a protruding rib formed in an inner peripheral thereof, the protruding rib movably disposed between the two stop rings;
• two springs sleeved on the center rod, each spring having one end abutted against one of the two stop rings and the other end abutted against the protruding rib;
• wherein when pulling the first sleeve, the protruding rib biases one of the two springs;
• when pushing the first sleeve, the protruding rib biases the other one spring to provide a restore force;
• a second sleeve sleeved on the center rod and the first sleeve, the second sleeve moved with the first sleeve, the second sleeve having a recess, a first pushing portion, and a second pushing portion respectively formed in an inner peripheral thereof, the recess disposed between the first pushing portion and the second pushing portion;
• and
• an engaging member disposed in an outer peripheral of the center rod, the engaging member having a protruding portion formed therein and an engaging end disposed in one end thereof, wherein when the protruding portion is pushed, the engaging end protrudes into an inner peripheral of the center rod to selectively engage with the tool bit;
• wherein when the first pushing portion abuts against the protruding portion, user pulls the first sleeve to move the second sleeve toward the first sleeve such that the protruding portion is received in the recess to disengage the engaging end with the tool bit;
• when the second pushing portion abuts against the protruding portion, user pushes the first sleeve to move the second sleeve away from the first sleeve such that the protruding portion is received in the recess to disengage the engaging end with the tool bit.