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PRINCIPLE

The PIV Unit consists of two pairs of opposed curved conical discs, mounted one pair on the constant speed shaft of the unit and one on the variable speed shaft. These opposed discs are keyed to the shaft, which enable them to slide axially on the respective shafts. Power is transmitted from one shaft to the other by a patented P. I. V. chain of special construction which rests in the Vee formed between these opposed discs and runs at a diameter depending on the axial distance separating the discs. The mechanism controlling the axial movement causes one pair of discs to approach each other as the other pair separates, so that the chain rises in one pair of wheels by the amount that it descends in the other.

OPERATION
The heart of the PIV unit is the all metal slatted chain and the grooved wheelfaces. The slats in the chain move laterally to engage the groove in the wheelfaces. Therefore the chain can not slip. The pitch diameter of both pairs of wheelfaces is controlled to an infinite number of positions by the pivoting control levers and the control screw.

Maximum speed setting
The input shaft wheelfaces are close together, forming a large driving diameter. The output shaft wheelfaces are automatically separated to form a small driven diameter.

Minimum speed setting
The input shaft wheelfaces are far apart, forming a small driving diameter. The output shaft wheelfaces are automatically closed to form a large driven diameter.