Constriction assembly

A constriction assembly comprising:

• a casing seat formed into concave-shaped and having two opposite upward walls, an regulator held in the interior thereof and a base connecting a pad, wherein the upward walls having two opposite bores at the middle thereof for receiving protruding buttons of the regulator and two pairs of bores respectively at its both sides for mounting the tenon of turning body, and at its inside of the upward walls providing a round stick near the turning body on which two ends of band connected;
• a regulator having opposite protruding buttons, wherein at both side of each protruding button provided with turning bodies while the turning bodies having a pair of tenons at its two transverse sides and chuck groves at the outsides thereof;
• a pad underlying the casing seat;
• two bands having ends mounting on the round sticks in the casing seat and the said ends provided with projection pieces;
• a constriction configuration can be obtained when the state in which the ends tightly pulling the band achieved by the construct of said members;
• and that pressure on the protruding buttons makes support arms to move thereby the turning bodies are drawn movably around the tenons as axes by the support arms and then the turning bodies being in the state of lightly turning so that to make the chuck groves displace can form a disengagement operation of the chuck groves from the bands and further make the band loose.