. American engineer . Section A PNEUMATIC LOADING HOIST. A convenient arrangement for loading or unloading cars isshown in Fig. 2. It consists of a trolley runway built up almostentirely of wood, and a 4-wheel trolley wdiich carries the air hoist. The runway extends over three tracks, having a span spread of 16 ft., which provides the necessary stability, andof 38 ft., and in this way allows for loading from one car to the columns are made up of two 5 in. x 12 in. beams bolted Fig. 3—Trolley for 7-Ton Loading ^ SecfhnA-A. Fig. 2—Pneumatic Loading Hoist Operating Over Three Tracks. 86 A
. American engineer . Section A PNEUMATIC LOADING HOIST. A convenient arrangement for loading or unloading cars isshown in Fig. 2. It consists of a trolley runway built up almostentirely of wood, and a 4-wheel trolley wdiich carries the air hoist. The runway extends over three tracks, having a span spread of 16 ft., which provides the necessary stability, andof 38 ft., and in this way allows for loading from one car to the columns are made up of two 5 in. x 12 in. beams bolted Fig. 3—Trolley for 7-Ton Loading ^ SecfhnA-A. Fig. 2—Pneumatic Loading Hoist Operating Over Three Tracks. 86 AMERICAN ENGINEER. Vol. 87, No. 2. together. The legs or braces arc made of 4 in. x 9 in. stock,and are tied together 112 ft. above the groiuid by a 4 in. x 9in. beam with a % in. iron tie rod. The runway oftwo lYz X 13J/2 in. beams, which are supported at the centerby a yoke suspended from two diagonal braces of 4 in. x SJ/jin. stock, extending over the runway and footing in the up- / Three-yyau Cock. „ hfffedccer^ ^ i erf. Check ^./.e shown in Fig. 6. It is made of a galvanized iron tank with ^in. copper heads and 1 in. pipe with the necessary fittings. Airis admitted the top of the tank through a tee. the upper endof which is used for filling the tank with sand. The air pres-sure in the tank is throttled down to about 10 lbs. per sq. a valve, as indicated, and the air pressure for the blast is
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
