(under subclass 240) Apparatus in which the opposing pressure surfaces both enter the side walls of the chamber and both are actuated for movement between the side walls of said chamber and in the direction of said side walls.
(1) Note. In these devices there are two movable pistons in the same box.
(2) Note. The travel of the piston or of one of the pistons or of the box bottoms may be after the compressive force has been discontinued and the movement merely for the removal of the material from within the frame of the box. Search this class, subclass 218 for reciprocating platen presses in which the press has means for removing the material from the pressure surface.
(3) Note. In the devices here classified both pressure surfaces are movable relative to the box frame and both are actuated. Where there is but one movable pressure surface yet the other pressure surface is removable from the box frame, search this class, subclasses 247+.
SEE OR SEARCH THIS CLASS, SUBCLASS:
218, see (2) Note above.
247+, see (3) Note above. 264, for reciprocating platen presses in which both platens are movable relative to one another, i.e., and each has actuating means.
SEE OR SEARCH CLASS
425, Plastic Article or Earthenware Shaping or Treating: Apparatus,
352+, for a female mold and opposed coaxial dynamic press members coacting therewith; see the search notes thereunder.
