Curly stress-tight structure for forming a hollow tube

Abstract

A stress-tight structure for forming a hollow tube includes a thin slice body having a first side edge and a second side edge. A deformation segment is formed on the second side edge and a tight engagement segment is extended outward from the deformation segment by a length. A first sharp projection is formed on an inside surface of the first side edge, and a second sharp projection formed on an outside surface of the second side edge and located between the deformation segment and the tight engagement segment. The second side edge is curled in a curling direction toward the first side edge to have the outside surface located at the second sharp projection of the second side edge correspond to the inside surface of the first side edge, and the first sharp projection is set in hooking engagement with the second sharp projection, thereby forming the hollow tube.

What is claimed is: 
     
         1 . A stress-tight structure for forming a hollow tube, comprising:
 a thin slice body, having a first side edge and a second side edge opposite to the first side edge;   a deformation segment formed on the second side edge;   a tight engagement segment extended outward from the deformation segment by a length;   a first sharp projection formed on an inside surface of the first side edge; and   a second sharp projection formed on an outside surface of the second side edge and located between the deformation segment and the tight engagement segment;   wherein the second side edge is curled in a curling direction toward the first side edge to have the outside surface located at the second sharp projection of the second side edge correspond to the inside surface of the first side edge, and the first sharp projection is set in hooking engagement with the second sharp projection, so that an outward-directed stress is induced and accumulated in the thin slice body through the curling to make the outside surface of the tight engagement segment of the second side edge in tight contact with the inside surface of the first side edge, thereby forming the hollow tube.   
     
     
         2 . The stress-tight hollow tube according to  claim 1 , wherein the thin slice body is made of one of a degradable material, silicone rubber, plastics, and Teflon. 
     
     
         3 . The stress-tight hollow tube according to  claim 1 , wherein the first sharp projection comprises a barb structure including a locking surface protruding from the inside surface of the first side edge by a height, and a slope surface connecting the locking surface and an outer end portion of the first side edge, and the locking surface and the slope surface define therebetween an acute angle. 
     
     
         4 . The stress-tight hollow tube according to  claim 1 , wherein the deformation segment comprises an increased thickness greater than an intrinsic thickness of the thin slice body. 
     
     
         5 . The stress-tight hollow tube according to  claim 4 , wherein the deformation segment is gradually decreasing with respect to the increased thickness at a portion adjacent to the tight engagement segment to connect to the tight engagement segment, so as to define the second sharp projection.