Patent ID: 7200899

Claim:
A coupling between a sheet member with an edge of a thickness T, having at least one opening formed adjacent said edge, and between a receiving member formed with a recess of a width W and spacers formed on a first sidewall of the recess, said spacers defining within said recess a groove of a width w, wherein said thickness T, said width W and said width w meet the condition T<w<W, said recess comprising also at least one projection formed on a second sidewall of the recess, said second sidewall being opposite to the first sidewall, said projection protruding into said groove, wherein said spacers facilitate rigidity of the recess and the arrangement being such that when said sheet member is advanced inwardly into said groove it is slidingly received therein and said projection is pressed out of the groove until the opening is aligned with the projection to allow snap-fitting of the projection into said opening, thereby providing a secure coupling between the sheet member and the receiving member.