Abstract: A tension regulator for a chain drive has a sensor positioned and attached adjacent the chain, preferably to chain guides for the chain which allow some free play for the chain, a logical switching unit connected to the sensor which signals when the chain configuration changes, particularly when the distance from the sensor to the chain changes, and a tension control connected to the logical switching unit. The logical switching unit signals and controls the tension control of the chain drive so that the chain tension is maintained at a preset value. Preferably the tension control comprises a telescoping cylinder about which the chain is mounted and an apparatus which extends or retracts the telescoping cylinder thus controlling chain tension. The sensor is preferably an electrical source which provides an oscillating, directed magnetic field.

Abstract: A fluid coupling interposed between an induction motor and a load has an impeller and a turbine together defining a working chamber connected via radially inward and radially outward passages with a delay chamber on the impeller side of a corotating housing. The two sets of passages are selectively blockable by shutters that are controlled by an evaluator, inserted in a space between the motor and load shafts, which also accommodates a power supply consisting of one or more batteries. The evaluator responds to several sensors, measuring such parameters as motor torque, load speed and acceleration, to drain or refill the working chamber.