Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part – Pivotally joined housings or housing sections enclosing...
Reexamination Certificate
2000-03-14
2001-03-06
Pyon, Harold (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
Pivotally joined housings or housing sections enclosing...
C425S190000, C425S19200R, C425S197000
Reexamination Certificate
active
06196823
ABSTRACT:
FIELD OF THE INVENTION
The invention is related to a die clamp assembly. In particular, the invention is related to a die clamp assembly for an extruder.
BACKGROUND OF THE INVENTION
Extrusion dies are attached to a last barrel of an extruder to form a processed material into desired products. Accordingly, the die should have a structure, clamping arrangements or other such means for attachment to the extruder.
There are many types of extrusion dies for extruders that form products of differing shapes and geometries. A sheet extrusion die takes a processed material, for example, a fluid stream usually flowing in a pipe, and shapes it into a thin, wide, uniform flat sheet of uniform-flowing fluids. A film extrusion die takes a fluid stream and shapes it into a thin, wide, uniform film. A stranding extrusion die takes a fluid stream and shapes it into a wide row of uniform-flowing strands. A profile extrusion die takes a fluid stream and shapes it into a complex and often multi-dimensional article, such as a door frame. These types of extrusion dies are discussed in the art.
An extruder die may comprise a screen pack, which can be provided in combination with a breaker plate. The screen pack is located at a predetermined position in or next to the extruder die to filter product as it passes through the extruder die or before the product has passed through the extruder die, and is retained in place by a clamping attachment arrangement. Preferably, the screenpack is located in the extruder die to filter the processed material as it passes through the extruder die. Screen packs in extruder dies must be periodically changed to ensure that their filtering is effective. Often the changing of the screen pack is long, laborious and time intensive process. Further, the changing of a screen pack often may cause considerable spillage, and accordingly resulting in large amounts of product waste.
There are several known clamping attachment arrangements available commercially to attach together an extruder die, screen packs, and an extruder. These clamping attachment arrangements are often cumbersome. Most clamping attachment arrangements are not positioned for an easy and expedited screen pack changing process, and are often inadequately arranged and positioned so as to cause considerable spillage and a waste of resources. Further, these clamping arrangements do not provide their own independent support and rely upon support from other external structures.
For example, one clamping arrangement comprises two collars, which bolt together at both ends. The collars however are not provided with their own separate support, and are generally hung from an overhead chain that renders the clamping arrangement awkward to manipulate and hard to use. Further, this type of support makes operation of the clamping arrangement potentially dangerous, which is undesirable. Other known clamping arrangements comprise complex two-bolt clamping arrangement designs. The two-bolt clamping arrangements are horizontally split, and attached to a flange of a last barrel of an extruder apparatus. When these clamping arrangements are opened, processed material from the extruder apparatus will often spill and drool onto the clamp mechanism, which of course is undesirable.
A vertically split one-bolt clamping arrangement design for an extruder die is also known, and is attached to a flange of an extruder's last barrel. This clamping arrangement design includes a pivot pin on a top portion and a bolt on the bottom to support the arrangement. The bolt is positioned in a location that is very difficult to access. Thus, product often falls onto the bolt, which is undesirable since it makes the arrangement more difficult to use.
Therefore, it is desirable to provide an extrusion die clamping assembly that permits for easy operation and quick-change of screen packs. It is also desirable to provide a mounting mechanism that allows a die and clamp to swing away from the extruder and attaches a mounting mechanism directly to the extruder so additional support structures are unnecessary. Further, it is desirable to provide a clamping arrangement that is small, light weight, and easy to use. Accordingly during a filter changing process, a minimum amount of spillage and reduced downtime are achieved to avoid large clean-ups and to conserve resources.
SUMMARY OF THE INVENTION
Accordingly, it is desirable to provide an extrusion die clamping assembly that overcomes the deficiencies of known clamping arrangements.
Accordingly, in an exemplary embodiment of the invention, an extrusion die clamp assembly for an extruder comprises at least one passage through which product flows. The extrusion die clamp assembly is attachable to an extruder and comprises at least one adapter plate that is connectable to the extruder. The extrusion die clamp also comprises at least one adapter plate passage that communicates with the passage of the extruder; at least one die body comprising at least one die body passage that communicates with the adapter plate passage; and at least one die plate that comprises at least one die plate passage that communicates with the die body passage and at least one opening so product can be extruded from the at least one opening. A clamp collar assembly connects corresponding peripheral surfaces of the adapter plate to the die body, and defines a closed position that connects the adapter plate to the die body and an open position that permits separation of the adapter plate and the die body. Further, a pivot assembly pivotally supports the clamp collar assembly for movement in a first direction and a second direction and the die body for movement in the second direction. The die body and the die plate are pivotable away from the adapter plate when the clamp collar assembly has been pivoted to the open position.
Further, another embodiment of the invention provides an extruder with an extrusion die clamp assembly, where the extruder comprises at least one passage through which product flows. The extrusion die clamp assembly is attachable to an extruder and comprises at least one adapter plate that is connectable to the extruder. The extrusion die clamp also comprises at least one adapter plate passage that communicates with the passage of the extruder; at least one die body comprising at least one die body passage that communicates with the adapter plate passage; and at least one die plate that comprises at least one die plate passage that communicates with the die body passage and at least one opening so product can be extruded from the at least one opening. A clamp collar assembly connects corresponding peripheral surfaces of the adapter plate to the die body, and defines a closed position that connects the adapter plate to the die body and an open position that permits separation of the adapter plate and the die body. Further, a pivot assembly pivotally supports the clamp collar assembly for movement in a first direction and a second direction and the die body for movement in the second direction. The die body and the die plate are pivotable away from the adapter plate when the clamp collar assembly has been pivoted to the open position.
Another embodiment of the invention provides a die clamp assembly adapted for connection to a last barrel of an extruder. The last barrel comprises a flange and the extruder and the last barrel defines at least one passage through which product flows. The die clamp assembly comprises a mounting connecting structure that communicates with the last barrel at least one passage of the extruder; a die body comprising at least one die body passage that is in fluid communication with the last barrel, where the at least one die body comprises a peripheral surface that corresponds to the flange; a clamp collar assembly that positions the flange and peripheral surface against each other in a closed position, and permitting the last barrel and the at least one die body to be separated from each other to an open position. The die clamp assembly also includes a pivot assembly that supports the c
Coyle Dennis Joseph
Gohr Eric Thomas
Renschler Ricky Joe
Silva Fernando Alves
Del Sole Joseph S.
General Electric Company
Johnson Noreen C.
Pyon Harold
Stoner Douglas E.
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