Sectioned metal springboard

Claim 1

A METAL SPRINGBOARD COMPRISING: (A) AN ELONGATED, HORIZONTALLY EXTENDING UPPER PLATE EXTENDING THE LENGTH OF SAID BOARD; (B) AN ELONGATED LOWER PLATE SPACED BELOW SAID UPPER PLATE IN OPPOSED RELATION THERETO AND IN VERTICAL REGISTRATION THEREWITH EXTENDING THE LENGTH OF SAID BOARD; (C) VERTICALLY DISPOSED INTEGRAL SIDEWALLS INTEGRAL WITH SAID UPPER AND SAID LOWER PLATES ALONG THEIR CORRESPONDING LONGITUDINALLY EXTENDING EDGES RIGIDLY CONNECTING SAID UPPER AND SAID LOWER PLATES, COOPERATTING WITH SAID UPPER AND LOWER PLATES TO PROVIDE THE WALLS OF AN OPEN ENDED TUBULAR BOARD; (D) END PLATES SECURED OVER SAID OPEN ENDS OF SAID BOARD; (E) VERTICALLY DISPOSED, HORIZONTALLY SPACED, PARALLEL INTEGRAL WEBS EXTENDING BETWEEN SAID UPPER AND LOWER PLATES EACH OF WHICH WEBS IS INTEGRAL WITH SAID UPPER AND LOWER PLATES; (F) THE THICKNESS OF EACH OF SAID WEBS BEING SUBSTANTIALLY UNIFORM AND LESS THAN THE THICKNESS OF SAID UPPER PLATE.