Expandable holder rack with rotary clamping function

An expandable holder rack with rotary clamping function, comprising:

• a main body defining a first axis and a second axis in a non-coaxial arrangement and in parallel to each other, the main body having an eccentric chamber disposed along the second axis;
• an actuating member rotatably disposed in the eccentric chamber and comprising a ratchet tooth surrounding the actuating member;
• a resilient member disposed in the eccentric chamber, with two ends of the resilient member connected with the main body and the actuating member, respectively;
• a clamping member slidably disposed on the main body and connected with the actuating member;
• when the clamping member is imposed with an external force to be expanded outward from the main body, the actuating member rotationally moves about the second axis, and the resilient member generates a recovering force;
• when the external force is removed, the resilient member drives the actuating member to reversely rotate through the recovering force, such that the clamping member retracts back toward the main body;
• and
• a forcing member disposed on the main body along the first axis, the forcing member being rotatable between a first position and a second position with respect to the main body and comprising a pawl;
• wherein one side of the eccentric chamber is in communication with a position limiting groove formed in an arc shape extension, the pawl being received in the position limiting groove and movable between two ends of the position limiting groove;
• the position limiting groove comprising a first positioning part;
• the pawl comprising a tooth face facing the actuating member and engaged with the ratchet tooth, and a second positioning part opposite to the tooth face;
• wherein the second positioning part and the first positioning part generate a frictional positioning effect, whereby the pawl is kept at the first position or the second position;
• the first positioning part and the second positioning part being formed in a continuous concave and convex shape matching each other;
• wherein at the first position, the pawl is engaged with the ratchet tooth so that the actuating member is unable to rotate, and the clamping member is unable to slide with respect to the main body and enters a positioned status;
• and
• wherein at the second position, the pawl leaves the ratchet tooth so that the actuating member is able to rotate, and the clamping member is able to slide with respect to the main body and enters a free status.