Abstract: The present invention relates to a granular material transport mechanism for a sand truck. The material mechanism is arranged in granular material flow communication with a granular material hopper, and is disposed on its lower side thereof, for distribution of said granular material from a spreader on the truck. The mechanism comprises an elongated containment housing for enclosing a rotary feed shaft. The rotary feed shaft has longitudinal ends that extend beyond the housing. A plurality of spaced-apart semicircular plates are disposed on the shaft. A bearing support for the feed shaft is arranged adjacent each longitudinal end of the feed shaft and outside of the containment housing. An opening on a rear lower side of the containment housing for permits the communication the granular material to the spreader arranged therebeneath.

Abstract: An improved lead magnesium niobate actuator is disclosed comprising a cylindrical lead magnesium niobate crystal stack mounted in a cylindrical casing wherein a bias means, such as one or more belleville washers, is located between one end of the crystal stack and a partially closed end of the casing; and adjustment means are provided which bear against the opposite end of the crystal stack, whereby an adjustable compressive force is constantly applied against the crystal stack, whether the crystal stack is actuated in an extended position, or is in an unactuated contracted position. In a preferred embodiment, cooling ports are provided for the circulation of coolant in the actuator to cool the crystal stack, and provision is made for removal and replacement of the crystal stack without disconnecting the actuator from the external device being actuated.