The details of the winch are shown in [Figs. 4] and [5], and the method of assembling the parts, in [Fig. 1]. The drum may also be driven without gears by fixing the crank directly to the shaft. Gears may be obtained from old machines, or purchased from dealers in model supplies. Make the supports L and M, Fig. 4, ³⁄₄ by 4 by 6⁵⁄₈ in., cutting patterns of paper, if desired.
Fig. 4
The Supports of the Winch are Made of ³⁄₄-Inch Wood, Bolted to the Bed
The gear, [Fig. 5], is 3¹⁄₂ and the pinion ³⁄₄ in. in diameter. The drum is of wood, 2 in. in diameter and 3⁵⁄₁₆ in. long. Its ends are 3¹⁄₂-in. metal disks, fastened with screws. The shaft is a ³⁄₈-in. bolt, 5³⁄₈ in. long, and bears in holes bored in the supports, as shown in the details of these parts. The crank N, Fig. 5, is made of a ³⁄₁₆-in. rod, bent as shown, and fitted with a washer to fit next to the pinion. The gear is set by means of the pawl O, which is bent from a strip of ¹⁄₁₆-in. sheet metal. The brace P is bent from a ¹⁄₁₆ by ³⁄₄ by 1⁵⁄₈-in. strip of sheet metal, and riveted to the pawl. Assemble the parts, fastening the gear to the drum end, and bolt the supports into place. Put the pinion into mesh with the gear at its proper place, and carefully mark the hole for the crank. Square the end of the crank and the hole in the pinion, and fit them to a driving fit. Fix the rope to the drum, and reeve it through the head block. The derrick is then ready for the hammer and the weighted nipper.
Fig. 5
Details of the Drum, Its Driving Mechanism, and Fittings
The hammer, shown in [Fig. 6], may be made easily from a solid block of lead, 1¹⁄₄ by 2⁵⁄₈ by 2⁵⁄₈ in. Cut ³⁄₁₆ by ⁷⁄₈-in. grooves in the vertical edges to fit the guides. Make the circular ³⁄₁₆ by 1⁵⁄₈-in. hammer plate Q of iron or brass, and fasten it with screws. Rivet the wire lifting strap R, as shown.
Fig. 6
A Simple Method of Making the Tripping Device, and Details of the Hammer
The single-hook nipper, shown in [Fig. 6], is made as follows: Flatten a piece of ³⁄₁₆-in. wire at the middle, and drill a ³⁄₃₂-in. hole for the bolt. Shape the lower end into a pointed hook, and bend the upper end to form the trip arm. This strikes the notch in the cap of the derrick, releasing the hammer. The rope is wired to the hook as shown. The nipper weight is made of a solid piece of lead, 1¹⁄₄ by 2⁵⁄₈ in., by 1 in. high, grooved at the ends to fit the guides. Cut a slot through it, for the hook, as shown in Fig. 6, and bolt the latter into place. The double-hook nipper is better mechanically, and may be made of two pieces of wire, or cut from sheet metal.