Joint Structure for an Air Valve

A joint comprising:

• a body having an inlet segment, an outlet segment, an air channel defined between the inlet segment and the outlet segment, wherein the outlet segment has a connection orifice;
• at least one locking block fixed in the outlet segment of the body, each of the at least one locking block having a tooth formed on an inner side thereof, and said each locking block having a driving portion arranged on an outer side thereof, wherein the tooth is controlled to move between a first position and a second position, and between the first position and the second position is defined a reverse driving travel obliquely extending to the inlet segment, the first position is located in the air channel, and the second position is located outside the air channel, said each locking block also has a coupling shaft formed on one side thereof and secured in the connection orifice so as to produce the reverse driving travel, wherein the reverse driving travel of the tooth of said each locking block is arcuate, and the tooth, the driving portion, and the coupling shaft are opposite to one another, wherein the tooth is close to the air channel, the driving portion is adjacent to the inlet segment, and the coupling shaft is proximate to the outlet segment;
• and
• at least one resilient element urging the tooth of said each locking block to move to the first position, and as controlling the driving portion, each of the at least one resilient element is pressed so that the tooth moves to the second position along the reverse driving travel.