Reversible mat

In combination, (a) a first and a second mat, each mat defining:

• a substantially flat wall member, an opposite grille wall member, and at least a first straight edge section edgewisely of said flat wall member and grille wall member;
• and (b) fastening means, releasably interconnecting said first edge sections of said first and second mats to bring said mats substantially coplanar to each other;
• wherein said fastening means includes a tenon member, defining an inner end integral to said first mat and an elongated ridge projecting from said tenon member inner end transversely to the plane of the first mat and made from a flexible, resilient, yet sturdy material, and a mortise member, defining a body portion integral to said second mat and a narrow mouth opening into a larger groove the latter thicknesswisely extending through said second mat lengthwisely of said first edge section thereof, said mortise member body portion made from a flexible, resilient, yet sturdy material, said ridge defining an enlarged outer end releasably engaged into said groove the latter being conformed to receive said ridge, said tenon and mortise members extending along substantially the whole length of said first edge sections of said first and second mats respectively but remaining positively within the plane of said interconnected mats;
• ingress/egress of said ridge into/from said groove being made through temporary physical deformation of said mortise members body portion and of said tenon member ridge when the latter frictionally extends through said mortise member mouth;
• wherein said tenon member ridge forms a curved bulge at its outer end, of substantially C-shape contour.

In combination, (a) a first and a second mat, each mat defining:

• a substantially flat wall member, an opposite grille wall member, and at least a first straight edge section edgewisely of said flat wall member and grille wall member;
• and (b) fastening means, releasably interconnecting said first edge sections of said first and second mats to bring said mats substantially coplanar to each other;
• wherein said fastening means includes a tenon member, defining an inner end integral to said first mat and an elongated ridge projecting from said tenon member inner end transversely to the plane of the first mat and made from a flexible, resilient, yet sturdy material, and a mortise member, defining a body portion integral to said second mat and a narrow mouth opening into a larger groove the latter thicknesswisely extending through said second mat lengthwisely of said first edge section thereof, said mortise member body portion made from a flexible, resilient, yet sturdy material, said ridge defining an enlarged outer end releasably engaged into said groove the latter being conformed to receive said ridge, said tenon and mortise members extending along substantially the whole length of said first edge sections of said first and second mats respectively but remaining positively within the plane of said interconnected mats;
• ingress/egress of said ridge into/from said groove being made through temporary physical deformation of said mortise members body portion and of said tenon member ridge when the latter frictionally extends through said mortise member mouth;
• further including three other mats, each of the five mats being quadrangular and defining one pair of opposite edgewise sections into each of which is embodied a tenon member and another pair of opposite edgewise sections into each of which is embodied a mortise member, said second and three other mats being releasably edgewisely connected to a corresponding one of the four side edge sections of said first mat.