Bench and plank cover

Claim 1

A WEATHERPROOF COVER FOR THE LOAD-CONTACTED STRINGERS OF SEATS AND TABLES COMPRISING A RESILIENT PAD EXTENDING THE EXPANSE OF THE STRINGER, A WEATHERPROOF SHEATH TOP COVERING THE PAD, A SHEAT SIDE INTEGRAL WITH THE SHEATH TOP AND EXTENDING DOWNWARDLY FROM THE TOP ADJACENT THE STRINGER SIDES, THE SHEATH TOP AND THE SHEATH SIDES DEFINING A NORMALLY CHANNEL-SHAPED MEMBER, AND A SHEATH SIDE FLANGE FIXED TO THE SHEATH SIDE AND EXTENDING UNDER THE STRINGER BOTTOM TO RETAIN THE SHEATH ABOUT THE STRINGER AND RESILIENT PAD, EACH SHEATH SIDE HAVING A HEIGHT LESS THAN THE SUM OF THE THICKNESS OF THE STRINGER AND THE RELAXED RESILIENT PAD SUCH THAT THE SHEATH TOP IS TRANSVERSELY CONVEX WHEN IN PLACE ON THE STRINGER, THE WIDTH OF THE SHEATH EXCEEDING THE WIDTH OF THE STRINGER AT AVERAGE AMBIENT AIR HUMIDITY AND THE SPADE BETWEEN OPPOSED SHEATH SIDE FLANGES BEING LESS THAN THE WIDTH OF THE STRINGER AT ZERO HUMIDITY, AND SAID STRINGER BEING FREE TO MOVE TRANSVERSELY WITH RESPECT TO THE SHEATH SIDE FLANGES.