Fast loosed belt structure

A belt structure for binding a human body for first aid, comprising:

• a belt for surrounding the human body;
• a first housing, wherein the first housing has a hollow axle pipe at the front section thereof for fixing the front end of the belt, two gears are mounted on the hollow axle pipe, the first housing has a resisting element mounted therein for engaging one of the gears, the first housing has a resisting-element window for exposing the resisting element, the first housing also has a buckling trough mounted at the rear section thereof and an engaging element mounted therein, and the resisting element and the engaging element are respectively biased by an elastic element at one end thereof;
• a second housing, wherein the second housing is covered on the hollow axle pipe and also the resisting element of the first housing, the second housing has an axle pillar mounted therein for extending into the hollow axle pipe, the second housing has a driving element and an elastic element biasing the driving element both mounted thereinside, in which the driving element engages the other gear, the second housing has a driving-element window mounted thereon for exposing the driving element, and the second housing has in indentation mounted at the other side thereof;
• and
• a third housing, wherein the third housing has an opening for fixing the rear end of the belt and another opening for extending out thereof, the third housing also a pressing shaft for pressing and fixing the belt, and the third housing further has a buckling element at the other end thereof,
• wherein the two ends of the belt are respectively fixed at the first housing and the third housing and form a circular belt structure through the first housing and the third housing being buckled together, the second housing turns upwardly by using the axle pillar in the hollow axle pipe as the axle center so as to drive the gear by the driving element and also engaging and fixing the gear by the resisting element as the second housing is homed, and the engaging element and the buckling element respectively of the first housing and the third housing are capable of being released fast for separating the first housing and the third housing, so that a belt structure capable of being fast buckled and loosed and capable of fine tuning the level of tightness is achieved.