Patent ID: 7575392
Filing Date: 2009-08-18
Classification: E01C

Abstract:
1. A ground cover laid on a pavement bed, comprising paving stones ( 20 , 44 , 45 , 46 , 48 , 49 ) each having an essentially flat top side ( 23 ), a bottom side ( 24 ), four upright sides, spacers ( 22 ) arranged continuously around the four upright sides ( 25 , 26 , 28 ) in a regular grid pattern ( 39 ), and shifting prevention devices on the four upright sides ( 25 , 26 , 28 ) and the bottom side, wherein: a) the spacers ( b) the shifting prevention devices on the bottom side ( c) the bottom side ( d) the depression ( e) the spacers ( f) the paving stones are laid on the pavement bed in a continuously interlocked manner such that one of the four upright sides of one of the paving stones abuts one of the four upright sides of the neighboring paving stone.