Patent ID: 7908802
Filing Date: 2011-03-22
Classification: E01C,E04F

Abstract:
1. A system for constructing tread surfaces comprising polygonal elements ( 1 ) wherein each element has a top surface and a number of substantially straight side edges arranged perpendicular to the top surface along a periphery of said top surface and that all side edges ( 2 ) are provided with two or more receiving openings ( 3 ) each opening adapted to receive and maintain a connector member, and that said elements ( 1 ), furthermore, along one or more of said side edges ( 4 ) are provided with one or more integrated and protruding connector members ( 5 ) which each are adapted to fit into said receiving openings ( 3 ), wherein in each of said receiving openings ( 3 ) comprises an enclosed channel part ( 7 ) and said connector member ( 5 ) comprises a head part ( 8 ) having a form complementary to a form of said enclosed channel part ( 7 ), further comprising replacement connector members which connector members comprise a central beam section connecting two heads, which beam has a cross-section such that it will fit in the receiving openings ( 3 ) of the elements ( 1 ), and a length corresponding to approximately twice the thickness of the side edges, and that the heads have a size substantially larger than the receiving openings ( 3 ).