Presses – With drain means for expressed liquid – Drain tube inbedded in material
Patent
1996-09-16
1998-05-19
Gerrity, Stephen F.
Presses
With drain means for expressed liquid
Drain tube inbedded in material
100125, B30B 902
Patent
active
057524386
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a filter envelope for a drainage element for presses used for separating fluids from solid materials, in particular for fruit presses, wherein the drainage element comprises a rod-shaped flexible drainage core with flow paths for removing the pressed-out liquid from the pressing chamber of the press and a fluid-permeable envelope surrounding the drainage core, and wherein at least one end of the drainage element is fastened on a juice collecting plate, pressure plate or the pressure jacket of the press.
BACKGROUND OF THE INVENTION
FIG. 1 shows a longitudinal sectional view through the known fastening of a drainage element on a fruit press. A plurality of drainage elements 3 are disposed in a pressing chamber 2, delimited by respectively one pressure plate 1, of a known fruit press, not shown.
A drainage element 3 essentially consists of an elastic drainage core 4, through whose outside located grooves 5 as shown by the section IA--IA in FIG. 1A the liquid is guided out of the pressing chamber 2 during the pressing operation, and of a stocking-shaped filter 6 placed over it for separating the solids from the liquids. The drainage core 4 and the filter 6 are fastened in a core holder 7 at the respective ends of the drainage element 3. In this case the filter 6 is placed over an elastic sleeve 8 and is fixed in place by means of an O-ring 9. A disk 10 is used for supporting the sleeve 8 on a transverse pin 11 which is laterally pushed into bores of the drainage core 4 and the core holder 7 and in this way assures the axial and radial fixation of the two components 4 and 7 in respect to each other.
The core holder 7 is connected by means of a spacer bushing 12 and a safety ring 13 with the pressure plate 1. In this case a protrusion 14 of the safety ring 13 which engages a groove of the core holder 7 through a slit in the spacer bushing 12, together with a collar 17 of the spacer bushing located behind the pressure plate 1, provides security against axial displacement.
As can be seen in FIG. 1, the filter 6 is held in the spacer bushing 12 by being clamped between the core holder 7, the sleeve 8 and the O-ring 8. At least the sleeve 8 is made of an elastically deformable material, preferably an elastomer. In this known embodiment the drainage filters 6 are produced by means of a knitting process and, to prevent runs, are provided with darts or cut under heat so that the stitches slightly melt and stick together at the ends near the disk 10.
This type of construction has the following disadvantages:
The assembly of the filter element 6 with the complete drainage element 3 is very labor-intensive. The filter 6 is pulled over the sleeve 8 and must be correctly placed in the longitudinal direction. Then the O-ring is pushed over it and must be clamped in the core holder 7 together with the drainage core 4. In the course of this, the following assembly errors occur as a rule: - formation of runs because of excessive pulling, - wrong placement in the longitudinal direction, - the O-ring is displaced during the insertion, - use of lubricants, although this is impermissible. These errors can result in insufficient fastening of the filter 6 in the connecting part. During operation the filter 6 is then pulled out from beneath the O-ring 9 and the operation of the press is hampered.
A problem also arises during disassembly of the filters 6 worn out through normal use, because in some cases the O-ring 9 is seated very solidly and therefore makes disassembly more difficult.
SUMMARY OF THE INVENTION
It is the object of the invention to avoid the disadvantages mention by means of a filter envelope of the type mentioned at the outset.
This object is attained in accordance with the invention by at least one ring-like bulge which is fixedly connected to the filter envelope at its one end by being surrounded by the filter envelope itself or by means of an extension connected therewith and can be deformed in such a way that it permits the respective end of the filter envelope
REFERENCES:
patent: 3103164 (1963-09-01), Willmes
patent: 3207064 (1965-09-01), Hauser-Bucher
patent: 5054952 (1991-10-01), Chara
patent: 5130022 (1992-07-01), Chara
patent: 5361691 (1994-11-01), Hartmann
patent: 5582100 (1996-12-01), Pinnow
Chara Alexandr
Hartmann Eduard
Bucher-Guyer AG
Gerrity Stephen F.
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