Connecting means for a toy building set

A connector for a toy building set, comprising a first coupling part and a second coupling part complementary to said first coupling part, said first and second coupling parts being provided on respective ones of a pair of building set elements which are to be interconnected, characterized in that the coupling parts are adapted to interconnect the elements by elastic movement between a stressed condition of at least one of said coupling parts wherein said second coupling part may be inserted within portions of said first coupling parts and a relaxed condition of said one of said coupling parts wherein said second coupling part will be retained by said portions of said first coupling part whereby relative linear and angular displacement is retarded, and that said connecting means further includes a clamping means movable between a release position in which elastic movement of said one of said coupling parts between said stressed and relaxed conditions is possible and a lock position in which said elastic movement of said one of said coupling parts is prevented.