(under subclass 240) Apparatus in which a pressure surface is so supported as to be free to move laterally if unrestrained, but is restrained in its direction of motion by the side walls of the chamber or by guiding structure associated with the chamber.
(1) Note. In these devices the acutation is usually by a flexible connection so that the guiding restraint of the box is necessary to the correct motion of the piston, the connection being either a pivot or a rope, cable, etc.
SEE OR SEARCH THIS CLASS, SUBCLASS:
67, for devices for compressing material within a silo in which the side walls of the silo guide a roller type pressing means.
