It is thus that a good designer and draughtsman “projects” or extends himself, to the advantage of many fellow workers.
The drawing, [fig. 277], shows a simple form of pillar crane: it consists of an upright cast-iron pillar, which is bolted on a cap stone, under which is the foundation plate not shown in the drawing; the boom is of rolled steel, supported by steel tie rods, and provided with rollers at the base; the hoisting gear is shown in broken lines and circles; all as seen in the drawing.
Fig. 278.—Fig. 279.
Fig. 280.
[Figs. 278, 279] and [280] show a drawing of a “hydraulic beam bending machine” in three views; [fig. 280] is a plan, [fig. 278] is an end elevation, and [fig. 279] a side elevation, and a portion of the latter in section shows the interior construction.
Note.—These three views are a practical illustration of drawings for a machine of the following dimensions: this machine has a bed 3 × 5 feet in area, with 27 holes in each side for the bending pins. The frame and cylinders are made of cast iron, the rams of machinery steel, and the slides for holding the bending blocks, of steel casting. The distance between the bending blocks is 17 inches. The cylinders are copper lined, 8 inches diameter, and the rams have a 6-inch stroke. The rams, which are independent and single acting, are returned by counterweights placed as shown under the table. The cylinders can be operated independently from either side of the machine by an arrangement of valves and levers. The machine complete weighs about 7,500 lbs.
Fig. 281.—Fig. 282.—Fig. 283.