side of the cavity 432 to hold one end of the torsional spring d 1 a rocker plate 44 formed like a hook having an axle hole 441 on the corner section and a notch 442 the axle hole 441 is coupled with a pintle c 2 which is also coupled with the axle hole g 1 of the bolt dock 21 and the axle hole g 3 of the lid 22 and is located therebetween and a wedge plate 45 having a notch 451 formed on one side to clip the groove 413 of the stem 412 of the lower bolt 41 and a bent flap 452 on another side to latch on the slide member 42 the outer handle 5 is located on the outer side of the door to form a chain movement with the upper bolt set 3 the lower bolt set 4 and the inner handle 6 through a linkage rod 7 and is coupled with a plurality of connecting struts e to fasten respectively the outer handle 5 and the inner handle 6 to the outer side and the inner side of the door and the inner handle 6 is located on the inner side of the door to form a chain movement with the upper bolt set 3 the lower bolt set 4 and the outer handle 5 through the linkage rod 7 and is coupled with a plurality of connecting struts e to fasten respectively the outer handle 5 and the.