Multi-platen press for pressing chipboards and the like without spacer strips

Claim 1

A multi-platen press without spacer strips between individual press plates for pressing chipboard comprising: a stationary upper press table; a rectangular movable lower press table having four corners; a plurality of movable platens interposed between said upper and lower press tables, said platens being adapted to receive material between them for pressing chipboards; at least one press cylinder on each of the four corners of said movable press table, said cylinders being operable to raise the movable press table toward said stationary press table; a separate control device associated with each of said cylinders to regulate the length of stroke of each cylinder so that all of the cylinders have precisely equal-length strokes, each of said control devices being mounted on the press adjacent the corner of said movable table to which its respective cylinder is connected, and each of said control devices being independently adjustable toward or away from said stationary upper press table, said control devices each being actuated by said movable table to stop the operation of its associated cylinder when the corresponding corner of the movable table reaches a preselected distance from said stationary table; and a simultaneous closing device for causing all of said plurality of platens to close simultaneously to equidistant spacing with regard to one another.