Patent ID: 7793981
Filing Date: 2010-09-14
Classification: B62D,F16B,Y10T

Abstract:
1. A main beam of a container semi-trailer comprising at least a front beam and a rear beam, wherein the front beam and rear beam are connected by two joints, each said joint connected to a respective one of said front beam and said rear beam and comprising: a first connecting plate connected to the said respective front beam or said rear beam; a second connecting plate extending transversely from said first connecting plate, said second connecting plate having a proximal end connected to said first connecting plate and an opposing distal end; a third connecting plate spaced from said second connecting plate, said third connecting plate extending transversely from said first connecting plate, said third connecting plate having a proximal end connected to said first connecting plate and an opposing distal end; and a fourth connecting plate slantingly connected between said distal end of said second connecting plate and said proximal end of said third connecting plate; and a web plate having edges defining a perimeter and being connected to said first, second and fourth connecting plates, said first, second and fourth connecting plates each having lateral edges defining a width and configured to form a closed chamber that encloses said perimeter of said web plate, wherein said second and third connecting plates of each joint are configured that when two of said joints are engaged with each other, said second and said third connecting plates of a first of said two engaged joints are respectively matingly engaged with and connected to said third and said second connecting plates of the other of said two engaged joints, and said fourth connecting plates of said two engaged joints are matingly engaged with and connected to one another to bear a horizontal stretching force exerted on the engaged joints.