Extrusion head including a sealing mechanism for a filter changing device
AssigneeHermann Berstorff Maschinenbau GmbH
InventorKlaus Bellmer
Life of this patent
Estimating the term…
Abstract
An extrusion head comprising at least one fixed head portion and at least one displaceable head portion pivotable into and out of an operative position includes means for filtering material being extruded and means for effecting change-over of the filter. The means for effecting the change-over includes at least two perforated plates displaceable on guide means in a direction generally at right angles to that of the extruded material. The at least one pivotable head portion includes a pressure surface which, in the operative position, abuts against the perforated plates thereby retaining the plates in position and sealing them against leakage of the extruded material.
Claims7
A sealing mechanism for a filter changing device in an extruder, comprising:
- (a) an extrusion head comprising at least one fixed head portion and at least one displaceable head portion mounted for pivotal movement relative to said fixed head portion,
- (b) means for pivoting said at least one displaceable head portion between an inoperative position wherein said at least one displaceable head portion is remotely spaced from said at least one fixed head portion, and an operative position wherein said at least one displaceable head portion is disposed with respect to said at least one fixed head portion to jointly define flow channel means therebetween,
- (c) filter means disposed in said flow channel means for filtering extruded material exiting said flow channel means,
- (d) holder means for retaining said filter means, said holder means comprising at least two perforated plates and guide means mounting said plates for displacement in a direction substantially at right angles to the direction of flow of said material exiting said flow channel means,
- (e) means for moving said plates in said guide means in said direction to replace one of said perforated plates from the flow path of said material and to position the other of said plates in such path, and wherein
- (f) said displaceable head portion is formed with a pressure surface which in the operative position of said displaceable head portion applies pressure to said plates for preventing the flow of material into said guide means.
Dependencies are inferred from the claim text.