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CASTLE VALLEY MILL
THIRD FLOOR-POWER FRAME
Power was delivered to the third floor via a three inch shaft coming from the geared system at the basement level. After the power was converted from horizontal rotary motion to vertical, the drive shaft passed through the mills three floors arriving at the third floor.
A power frame was constructed of timbers to hold in place two large iron horizontal beveled gears and a large 10" horizontal belt pulley which powered a secondary, clutch operated, power take off.
The upper set of beveled pinion gear and shaft directed power horizontally across the north/south mid section of the mill driving the Central rear elevator head and the small suspended separator located behind the rear elevators.
The lower set of beveled pinion gear and shaft directed power horizontally to the rear of the mill, powering the six rear grain elevator heads by a sprocket/chain system, and with pulleys, powered several bolting machines.
Below the beveled gears on the main drive shaft was a large iron belt drive pulley which delivered power to the secondary power take off, which was used to drive the Eureka Brush machine and other equipment.
The secondary power take off had interconnecting belts to drive additional equipment that had their drive pulleys located below the equipment and usually powered vertical drive pulley shafts.
The only remaining parts of the power frame are several vertical timbers, showing notches where the journals to hold the shafts and gears were once located.
This power mechanism was added after the mill had been extended and dates to around 1879.
The illustrations show only mill equipment that was in place when I studied the mill. Most likely other equipment was also powered by these systems. None of the gears, shafts, or pulleys were in place when this study was conducted.
The mill has many gears and pulleys, likely original equipment, spread around the floors of the mill haphazardly, giving a hint of what the equipment might have looked like, and these models were used for the following illustrations.
View of Power Frame timbers. Note notches in timbers indicating where bearing journals were once located The short journal beam running diagonally, center right, once housed the journal that held the lower pinion gear and shaft that delivered power to the rear of the mill, and to a pulley driving a shaft which powered the front section of the mill. The top most journal held the main vertical drive shaft in place. Note the hole in floor directly below it. The journal second from top, held a pinion gear and shaft delivering power across the mid section of the mill, to the Central Rear Elevator and the suspended separator located behind the six rear elevators. Notch in lower 10"X10" vertical timber (right of center) allowed clearance for the large belt pulley to clear the beam.
View of power frame from rear looking towards front of mill. The lower journal support is removable being held in place by the peg on left. From this angle the upper main shaft journal and the lower journal are shown. The upper journal cross beam is also removable held in place by several wooden pegs. Note notch in timber center right near floor.
View showing gearing in place within the Power Frame. In lower right of illustration is the drive pulley which powers the drive shaft going to the front of the mill. Lower drive belt and pulley powers a secondary power take off (lower center left of illustration).
View showing Power Frame from rear of mill. To left of center is the drive pulley and shaft for power to front of mill. It is driven by the pulley on the lower pinion gear and shaft, which also drives the rear six elevators and other machinery.To the right of center, to right of top pinion gear, is the pulley belt that drives the Center Rear Elevator ( not in view) and the small suspended separator located behind the rear elevators. The lower drive belt powers the secondary power take off with clutch.
Overall view of Power Frame showing connection to Center Rear Elevator (right) and power to the front drive pulley and shaft located on left in illustration. Some supports are not shown for clarity.
View showing from top left, top pinion shaft powering suspended separator and belt to Center Rear Elevator (not shown) Lower pinion drives a shaft with pulley wheel and belt to drive shaft powering front of mill (on right), and to the rear the six rear elevators and various bolters. In the foreground right is the secondary power take-off drive and clutch mechanism.
View of overall power distribution system. Power frame is mid center top of illustration. Drives to suspended separator, Center rear Elevator, Front drive shaft, Rear Elevators, Secondary Power Take Off and front elevator drive pulleys are shown.