Abstract: A therapeutic wrist rotator provides for the passive rotation of the wrist of a user of the device for rehabilitation of the wrist after injury or disease. The device includes a case which is adapted to be immovably affixed to a stationary object in order to resist the forces applied during use. The case includes an electric motor driving a reduction drive to provide relatively slow rotational speed and relatively high torque to an output shaft. The output shaft includes a handgrip extending therefrom. On/off and rotational direction switches are provided to control the operation of the device, which may be powered by conventional alternating current or by one or more batteries. A protractor dial surrounding the output shaft provides an indication of the rotation achieved during use of the device, and a pair of indicators provides an indication of the maximum rotational movement in both clockwise and counterclockwise directions.

Abstract: The space between the open bottom mold and the supporting stool used for casting ingots is sealed by placing a thin wall steel tube between the mold and the stool. The weight of the mold partially collapses the tube causing the surfaces of the tube to conform to both the surfaces of the mold and the stool, thus forming a seal.