Lumber, its manufacture and distribution . e saw and the rod B is directly attachedto the piston rod of a vertical, double-acting, 4-inch bore compressed-air cylinder placed directly overhead. The action of valves whichadmit compressed air to the cylinders is controlled by short leversin the trimmer levermans box, each valve being directly connectedby an air-feed pipe to an individual cylinder. An electric control for an overhead trimmer was put on the marketin 1921, and was designed to eliminate pull cords and rods on hand-operated machines, and valves, piping and pipe connections on com-pres
Lumber, its manufacture and distribution . e saw and the rod B is directly attachedto the piston rod of a vertical, double-acting, 4-inch bore compressed-air cylinder placed directly overhead. The action of valves whichadmit compressed air to the cylinders is controlled by short leversin the trimmer levermans box, each valve being directly connectedby an air-feed pipe to an individual cylinder. An electric control for an overhead trimmer was put on the marketin 1921, and was designed to eliminate pull cords and rods on hand-operated machines, and valves, piping and pipe connections on com-pressed-air systems. A magnet is mounted above each saw frame, thelatter having a rod connection with the magnet The operat- 1 The magnet consists of a coil of closely wound copper wire, through the centerof which, a 2-inch steel plunger travels. The mechanism is enclosed in a cast-ironcase 10 inches in diameter and 12 inches long, with a small compression cylinder forcushioning the up and down stroke of the plunger. THE TRIMMER 105. HS9 By permission The Prescott Co. Fig. 78.—An Overhead Trimmer. A. Individual Saw Drive. B. Control Rod. C. Counterweight.
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License: Licensed
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
