Patent ID: 7568856

Claim:
A joint for connecting a first main beam of a container semi-trailer and a second main beam of the container semi-trailer, wherein the joint comprises: a first connecting plate disposed on a connecting end of the first main beam of the container semi-trailer, wherein at least a lower side of said first connecting plate extends outwardly and forms a first extension, a first plurality of connecting holes are disposed on said first connecting plate and said first extension; a first web connected to said first extension of said first connecting plate and a first side beam that is disposed on said lower side of the connecting end of the first main beam of the container semi-trailer; a first flange disposed along an outer side edge of said first web, wherein two ends of said first flange are respectively connected to said first extension and the first side beam; a second connecting plate disposed on the connecting end of the second main beam of the container semi-trailer, wherein at least said lower side extends outwardly and forms a second extension, a second plurality of connecting holes corresponding to said first connecting holes are disposed on said second connecting plate and said second extension; a second web connected to said second extension of said second connecting plate and a second side beam that is disposed on the lower side of the connecting end of the second main beam of the container semi-trailer; a second flange disposed along an outer side edge of said second web, wherein two ends of said second flange are respectively connected to said second extension and the second side beam; and fasteners, each of which are inserted into corresponding said first and second connecting holes and fastened to directly connect the connecting ends of the two main beams of the container semi-trailer, thereby form a complete main beam of the container semi-trailer, wherein said the first connecting plate, said first flange and said first web are configured such that said first web is enclosed at its whole perimeter by said first extension of said first connecting plate, said first flange and the first side beam together, so as to form a closed box-shaped frame, and wherein said second connecting plate, the second flange and said second web are configured that said second web is enclosed at its whole perimeter by said second extension of said second connecting plate, said second flange and the second side beam together, so as to form another closed box-shaped frame.