| 摘要 |
THROATING MAY USED IN PLURALITY TO FORM A CONTINUOUS GROOVE AT THE LOWER FACE OF A LEDGE. SAID THROATING COMPRISES OF AN ELONGATED STRIP HAVING A LONGITUDINAL RIDGE OF UNIFORM HEIGHT AND WITH A BEAD ATTACHED ATOP AND WITH A FIRST FLANGE AND A SECOND FLANGE ATTACHED TO AND EXTENDING OUTWARDLY FROM THE RESPECTIVE LOWER SIDE EDGES OF THE LONGITUDINAL RIDGE AND WITH THE ANGLE BETWEEN THE PLANE OF THE FIRST FLANGE AND THE PLANE OF THE SECOND FLANGE TO FIT CO-OPERATIVELY WITH THE CORNER EDGE OF THE LEDGE WHERE SAID THROATING IS TO LOCATE. SAID SECOND FLANGE COMPRISES A PAIR OF SPACED APART SUBSTANTIALLY PARALLEL RIBS WITH A GROOVE OF UNIFORM CROSS-SECTION IN BETWEEN. THE THROATING SIGNIFICANTLY REDUCES THE TIME AND SKILL NEEDED TO FORM THE GROOVE ON THE LOWER FACE OF THE LEDGE WITH SAID GROOVE FORMED BEING NEAT AND DIMENSIONALLY ACCURATE.
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