Connecting arrangement

DETAILED DESCRIPTION I claim: 1.
A structural connecting arrangement comprising a first structural element having a first surface, and a second surface; a second structural element also having a first surface and a second surface; at least one connecting member connecting said structural elements and retaining said first surfaces in mutual abutment at an interface while said second surfaces face away from each other; an annulus of discrete frustoconical projections on said first surface of said first structural element concentric to said connecting member; and an annulus of discrete frustoconical recesses formed in said first surface of said second element also concentric to said connecting member, the projections of said first element being matingly received in the recesses of said second element so as to resist forces which are transmitted between said elements and which are substantially in the plane of said interface.
2.
A connecting arrangement as defined in claim 1, wherein said elements are plate elements.
3.
A connecting arrangement as defined in claim 1, wherein said elements are plate elements and at least one thereof is of metallic material.
4.
A connecting arrangement as defined in claim 1, wherein said elements are plate elements and at least one thereof is of synthetic plastic material.
5.
A connecting arrangement as defined in claim 1, wherein said projections and recesses are equi-angularly spaced about said connecting member.
6.
A connecting arrangement as defined in claim 1, respective first or second surface; wherein said elements are provided in the respective other surface with a corresponding depression opposite each of said projections and with a corresponding projection opposite each of said depressions, respectively.
7.
A connecting arrangement as defined in claim 1, wherein said projections and depressions have a shape resembling half of an ellipsoid.
8.
A connecting arrangement as defined in claim 1, wherein said projections and depressions are of hemispherical shape