Joint of light metal parts

Claim 1

In a car body for rail vehicles comprising a prefabricated roof and a side wall connected thereto, both said roof and wall being of a metal lighter than steel, the improvement wherein means connecting said side wall to said roof comprises: a plurality of wedge-shaped male elements on one of said side walls and roof, and a corresponding plurality of larger wedge-shaped female elements on The other of said side wall and roof, said male and female elements being interengaged, each said male element having an acute angle apex formed by first and second leg portions, each said first male leg portion lying in a plane parallel to the plane of said side wall, and each said female element having first and second leg portions, each said first female leg portion lying in a plane parallel to the plane of said side wall, said first male and female leg portions contacting one another along an area of the inner surface of said first female leg portion and an area of the outer surface of said first male leg portion, one of said first male and female leg portions having a groove therein along the said contacting surface, said groove extending parallel to said acute angle apex formed by said male element leg portions, one of said second male and female leg portions being inclined at said acute angle, and at least one of said second male and female leg portions being elastically deformable, at least one of said second male and female leg portions having means thereon to space said second male leg portion from said second female leg portion, said means comprising an offset portion having a surface inclined at said acute angle and contacting said one second male or female leg portion inclined at said acute angle, and an additional positive coupling between said roof and wall, said additional positive coupling being located along an inner element.