Plastic coupling device for connecting two building elements

A plastic coupling device comprising:

• an elongated coupling member, said elongated coupling member having:
• a top plate,
• two side plates extending approximately perpendicularly from said top plate,
• two bottom plates extending approximately perpendicularly from said side plates, respectively, and
• two inwardly bent end plates extending approximately perpendicularly from said bottom plates, respectively;
• and
• a pair of adjacently placed elongated plate members for being operatively coupled by said elongated coupling member, each of said elongated plate members having:
• a bottom plate having an elongated slot line disposed in the center thereof,
• two side plates extending approximately perpendicularly from said bottom plate,
• two top plates extending approximately perpendicularly from said side plates, respectively,
• two inwardly bent end plates extending approximately perpendicularly from said top plates, respectively;
• and
• an elongated partition disposed in the center of the inner surface of said bottom plate and the opposite side from said elongated slot line, whereby the elongated coupling member is tightly coupled with the pair of elongated members by slidably engaging both side portions of the elongated coupling member with both inner side spaces of a W-shaped space of the pair of profile members and in turn, engaging both inner side portions of the pair of profile members with a T-shaped space of the coupling member.