Emergency Lifting Device of Rope and Lever
When block and tackle, chain hoists, or similar equipment are not at hand, the simple arrangement shown in the sketch is useful for lifting heavy loads. Make the lever A of a piece of 2 by 4-in. stuff, and cut notches into it for the ropes, as indicated. From a suitable support, B, fix the ropes C and D to the lever A at the proper notches, permitting the ends C-1 and D-1 to be drawn down and fastened to the floor or other support as required in raising the load. Fix the rope E to the load W, and suspend it from the lever A at the proper notch by means of a loop, E-1. To raise the load, bear down on the end of the lever when it is in its original position A-1, bringing it to the position A-2. This will bring the lower rope to position E-2. Draw up the slack in rope D, to bring the loop to position D-2, and fasten it. Then lift the lever A from its position A-2, to the position A-3, and draw up the slack in rope C to bring the loop up to position C-2. The lower rope will be brought to position E-3. By repeating this process, the load may be raised gradually. The ropes may, of course, be of various lengths within the range of the support and the operators.