Abstract: A submersible seal that operates in a substantially frictionless manner is provided for protecting a motor from liquid intrusion along the shaft. Motors of this type are commonly used, for example, in aerators, pumps, mixers, flow developers, and the like. The submersible seal of the present invention includes a stationary seal element and a rotating seal element. The stationary seal element is in the form of a tubular section which is attached to the motor casing, surrounding but spaced from the rotating shaft. The rotating seal element, is a cylindrical section which is attached to the rotatable shaft and inter-engages the stationary seal element to form a labyrinth passageway having a first end at the casing of the motor, a second end opposite the first end, and at least one reverse bend therebetween. Liquid from the body of liquid in which the motor is immersed attempts to enter the first end of the labyrinth passage, and in so doing compresses an air cushion in the labyrinth passage.

Abstract: A tool for rotating a rod is provided which is formed of three members. A first member is formed as a sleeve and has an internal opening size to receive the rod. This sleeve has a tapered, portion which is placed over the rod. A second member, which may also be in the form of a sleeve slips onto the first sleeve and engages against the tapered portion. A third member sleeve is axially fixed to one of the first and second members and engages against the other of the members. A mechanical arrangement is provided to selectively urge the third sleeve apart from the other members against which it engages in order to move the second member and the first member relative to one another along the tapered surfaces to collapse the end of the first member engaging the rod to increase the gripping force of the first member with the rod. The first member has a shaped contour for receiving a torque applying device, such as a wrench, so that the first member can be rotated, thus rotating the rod.