(under the class definition) Apparatus comprising a means specifically provided to positively move or prevent movement of a fluid which acts (1) to transfer heat between it and an apparatus part, (2) to reduce friction between two relatively moving parts or (3) as a sealing fluid to prevent, preclude or reduce unwanted flow of other fluid between two relatively moving apparatus parts.
(1) Note. Included under this definition is an elevated tank containing lubricating, sealing or heat exchanging fluid for gravity flow of the fluid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
109, for apparatus having a chamber containing sealing fluid and a member connected to and rotating with the shaft* continuously causes motion of the sealing fluid.
177+, for apparatus having heat exchanging means, but having no means, such as a fan, pump or valve specifically provided to positively move or control movement of the heat exchanging medium.
