By Ronald Ahrens
The reinforced-concrete elevator that Tillotson Construction Co. built for Farmers Union Cooperative Association for $60,000 in 1950 did without expensive options like an integrated central driveway, a full basement, and an electrically operated manlift. But it was still a substantial and well-made structure that continues in operation in Cedar Bluffs, Neb.
Today, according to Randy Carlholm, the co-op’s general manager and CEO, an electrically driven manlift serves in place of the original hand-operated one. Farmers deposit grain in the external enclosure, and it is conveyed below ground to the leg.
Our records say this elevator had four tanks, or silos, of 16 feet in diameter and rising 120 feet. Storage capacity was 130,675 bushels. There were nine internal bins. From outside it appears there are more tanks. Without a walk-through, we are unable to reconcile this discrepancy. Are we talking apples and apples here?
The construction process consumed 1,024 cubic yards of reinforced concrete and 44.19 tons of steel.
Another 2.3 yards of plain concrete went for the hoppers.
The main slab was 21 inches thick and covered an area 46×46 square feet to support a gross loaded weight of 6,365 tons. The pit was 16 feet 7 inches deep.
Atop the tanks, the cupola, or headhouse, measured 14 feet wide, 24 3/4 feet long, and 21 1/2 feet high.
This is a single-leg elevator with the boot and head pulleys spaced 150 feet apart. The boot pulley was 60 x 12 x 2 3/16 inches while the head pulley was 1 1/4 inches wider. The head turned at 40 rpm thanks to a 25-horsepower Howell motor. The pulleys carried an 11-inch, 6-ply Calumet belt with cups 10 inches wide and 6 inches deep spaced 7 1/2 inches apart.
Theoretical leg capacity rated at 5,972 bushels per hour; actual capacity was 80 percent of theoretical, which rounded off to 4,780 (4,777.6) bushels per hour. This required just 22.3 horsepower.
J.B. Ehrsam and Sons Manufacturing Co. provided the hand-operated manlift.
The dump grate was 6 x 5 feet.
With the 10-bushel load-out scale and 8 1/4-inch spout, we can’t guess how long it would take to fill a rail car with corn, but a fascinating document we found suggests that filling a car with wheat would take about 80 minutes.