Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article
Patent
1993-05-07
1994-11-08
Bushey, Charles S.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
425167, 425186, 425258, 425411, 425454, B29C 3300
Patent
active
053624343
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a vertical press with at least three mold carrier elements, of which at least two are vertically movable and one is placed in a fixed position.
BACKGROUND OF THE INVENTION
A brickmaking press is disclosed in DE-A1-28 41 684 (BucherGuyer AG), in which the press dies have replaceable die plates. The production of molded parts by the pressing process on such vertical presses requires the installation and removal of corresponding replaceable molds on at least three mold carrier elements. At least one die each is attached to an upper or lower die carrier each; however, an extruding die is incorporated in mold carrier plate.
Depending on use, other similar systems necessitate the installation of other stationary or movable dies. The above-mentioned three or more mold elements are then moved against one another for press molding the poured-in raw materials. In this process, at least two mold elements are moved relative to the pressure mold. The top die presses from above downward and the frame of the pressure mold is also movable in the pressing direction. However, the lower die is attached securely to a lower crosspiece of the press frame and remains stationary.
Other systems have a stationary pressing table rigidly connected with the pressing system, but two movable dies. In another known system, all three mold elements are movable.
A change of the above-mentioned molds requires in each case the replacement of all mold elements. In this case, the latter remain incorporated in their frame or are connected with one another before the removal by connecting elements for joint removal. When large parts are pressed, the molds are correspondingly heavy, so that when molds are replaced, mechanical auxiliary means are necessary for insertion and removal.
In known presses, the changes of molds requires, in particular those heavy molds weighing one or several tons, the use of the above-mentioned mechanical devices, e.g., forklift trucks or hoists, by movement on an available change of mold carriage. Such processes involve a considerable expense equipment and labor by the relatively expensive hoists.
SUMMARY OF THE INVENTION
The object of the invention is to avoid such disadvantages and, simultaneously, to replace in a simple way and make accessible other parts of presses, such as mechanical mixers incorporated in the area of the hopper, for the purpose of cleaning, for maintenance or for repairs.
According to the invention, this is achieved with a vertical press of the initially mentioned type having lifting means for replaceable parts of the press, which are attached to the topmost mold carrier element and are movable at least partially in horizontal and/or vertical direction.
An essential feature of the invention is that the topmost mold carrier element, to which the lifting means are attached, is vertically movable, and the vertical movement of the lifting means results from this movement.
According to another feature of the invention, the lifting means, seen from a front side of the press, is movable forward and/or backward horizontally up to outside the area of the press. In this case, the lifting means suitably are attached to the topmost mold carrier element outside the area which carries the mold.
The lifting means preferably comprise two guide rails, which are attached to two opposite sides of the topmost mold carrier element on the underside thereof, two running elements mounted at a permanent distance to each guide rail, as well as a swivelable, elongated lifting element parallel to the guide rail on each running element.
According to another feature of the invention, a programmed control for the movable mold carrier elements and lifting means is provided which controls the vertical movements by steps and positions assigned and determined to the specific molds.
A process for an advantageous operation of the vertical press, in which a movable unit for receiving the mold carrier element for the compression mold is vertically movable between the topmost and a
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patent: 3084387 (1963-04-01), Tochner et al.
patent: 3679340 (1972-07-01), Springs
patent: 4439123 (1984-03-01), Sano et al.
patent: 4490103 (1984-12-01), Vogt
patent: 4631015 (1986-12-01), Shigeo et al.
patent: 4795334 (1989-01-01), Kitahara
patent: 5002711 (1991-03-01), Iwama et al.
patent: 5211966 (1993-05-01), Raudies et al.
Hauser Hans U.
Lindemans Jorg
Mick Martin
Bushey Charles S.
Jaskiewicz Edmund M.
Laeis + Bucher GmbH
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