. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . Key Wrench TreadleRods andTurnbuckle Treadle Spring Toot Treadle Figure 23.—Open Throat Folding Machine. is m a proper position, ready for edging, the material issecurely clamped and remains in a fixed and stationaryposition while the bend is made. Open Throat Folder,—The construction of the brakeand of the open throat folder provides for edging sheetmetal as described. Figure 23 illustrates a mode
. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . Key Wrench TreadleRods andTurnbuckle Treadle Spring Toot Treadle Figure 23.—Open Throat Folding Machine. is m a proper position, ready for edging, the material issecurely clamped and remains in a fixed and stationaryposition while the bend is made. Open Throat Folder,—The construction of the brakeand of the open throat folder provides for edging sheetmetal as described. Figure 23 illustrates a modern type of open throat SHEET METAL WORKING MACHINERY 59 folder which operates similarly to the floor brake, or whatis better known as the cornice brake (Figure 24).. In operating the open throat folding machine, the sheetof metal being properly inserted in the machine between 60 SHEET METAL WORKERS MANUAL the clamping bar and bed, the clamping bar is broughtdown on the material through the depression of a foottreadle and spring, and the foot treadle is not releaseduntil the folding bar is raised and the forming of theedge, lock, or angle is completed. The adjustable stoppin on the right end of the machine is adjusted throughscrew A by a key wrench for stopping the progress of thefolding bar at any angle. Spring pin gauges are fittedin the folding bar, which permit the forming of locks fromy3e to li3e inches in width on the 30-inch machine, andfrom x36 to li56 inches on the 42-inch machine. Theopen throat folding machines in the lengths mentionedhave a capacity for operating on iron of No. 22 gauge andlighter (U. S. Standard). As the sheet of metal that canbe edged or formed passes through the jaws from frontto back without obstruction, the machine
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Keywords: ., bookcentury1900, bookdecade1910, bookidsheetmetalwo, bookyear1918
