Receptacles – Arrangements of plural receptacles – Receptacle having rigid – removable inner container
Reexamination Certificate
2000-08-08
2001-12-04
Castellano, Stephen (Department: 3727)
Receptacles
Arrangements of plural receptacles
Receptacle having rigid, removable inner container
Reexamination Certificate
active
06325230
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a galvanizing tank with an outer tub of steel, within which an inner tub of chemically resistant plastic is seated.
For chemical or electrochemical surface treatment of parts, the parts with their surfaces to be treated are dipped into baths comprising aggressive media, for example acids or lye.
Because of the static loads, it is preferred that the bath be provided in a tub of a sturdy material, for example of steel or concrete. However, materials with a sufficiently high sturdiness have the disadvantage that they are attacked by the aggressive media and are destroyed, while materials resistant to aggressive media do not exhibit sufficient stability. In order to combine the static load bearing characteristics with a reliable protection against aggressive media, two solutions are known.
The first approach to solving the problem envisions that the tub of the static load bearing material, for example a steel tub, is cladded with a chemically resistant plastic, while in the second approach an inner tub of a chemically resistant plastic is seated in this steel tub. The present invention is concerned with this second approach.
The aggressive media is located in an inner tub, frequently referred to as inner liner, of chemically resistant material, for example of plastic, which is seated in an outer tub made for example of steel or concrete. Depending on the type of the surface treatment, media in the inner tub is heated to a temperature of 100° C. An arrangement comprised of an outer tub and an inner tub seated in the outer tub for receiving an aggressive media is thus subject to multi-faceted requirements and strong stresses. The inner tub must on the one hand be resistant against the aggressive media. Because of the different thermal coefficients of expansion of the inner and the outer tub, which are made of the different materials—plastic for the inner tub, steel for the outer tub—there must on the other hand be provided suitable precautionary means, in order to prevent mechanical damage, for example tears, of the two tubs as well as a leakage or overflow of the aggressive media.
2. Description of the Related Art
From DD 213 698 B1 an arrangement of this type, with an outer tub and an inner tub, is known.
In the outer tub with a rim made of steel is seated an inner tub of polypropylene with narrower breadth and width than the internal breadth and length of the outer tub, in order to provide sufficient space for lengthwise and widthwise expansion of the inner wall caused by rising temperature. On the upper edge of the inner tub a trapezoid-shaped circumscribing shank is welded on, which lies on the rim of the outer tub. The inner kink-bend of the shank is directed upwardly and curved outwards, so that the inner wall can expand upwardly, the shank however nevertheless remains resting upon the rim of the outer wall.
A first disadvantage of this known arrangement lies therein, that the trapezoid-shaped shank lying on the rim of the outer tub has no flat or planar resting surface, but rather exhibits an arc directed upwardly. A second disadvantage is to be seen therein, that this arc changes with temperature changes.
In DD 145 641 a further arrangement of an outer tub and an inner tub is known.
The inner wall of plastic exhibits raised weld beads, on which the inner tub rests upon the outer tub, in order to provide space for the expansion of the inner wall as a result of increases in temperature.
In this arrangement there is the danger, that fluids running out of the inner wall can flow into the space between the inner and outer tub.
Finally, from DD 234 448 A1 a further arrangement of an outer and an inner tub is described.
One plastic tub seated in a steel tub lies only in the upper rim area and only partially on the floor on the steel tub, so that the plastic tub can expand in a pillow-like manner as a consequence of increases in temperatures.
Also in this arrangement there is the danger that overflowing fluids out of the inner tub flow into the space between the inner and outer tub.
SUMMARY OF THE INVENTION
It is thus the task of the invention to design a galvanizing tank with an outer tub and an inner tub, such that for its part a tension-free expansion of the inner tub is ensured and on the other hand a spilling out or overflowing of the aggressive media provided in the inner tub into the space between the inner and the outer tub is prevented.
This task is solved according to claim
1
, in that in the upper rim area of the inner side of the inner tub a circumscribing channel is provided for receiving of fluids, and that a frame with at least one shank lies upon the tub rim of the outer tub, which extends or dips into the channel, without however lying upon the floor thereof.
Since the channel is filled with fluid, for example water, it forms a water lock in cooperation with the shank of the frame which dips into the fluid, which water lock seals off the inner tub fluid-tight and gas-tight against the outer tub, and makes possible at the same time a tension-free expansion of the inner tub upwardly.
REFERENCES:
patent: 1721311 (1929-07-01), Muenchen
patent: 1920486 (1933-08-01), Smith
patent: 2269994 (1942-01-01), Sperry
patent: 2294393 (1942-09-01), Erne
patent: 2339876 (1994-01-01), Phillips
patent: 2541090 (1951-02-01), Orr et al.
patent: 3599601 (1971-08-01), Ishikawa et al.
patent: 3654956 (1972-04-01), Tsubouchi
patent: 3833163 (1974-09-01), Denslow et al.
patent: 4603656 (1986-08-01), Jaye Jr.
patent: 5720815 (1998-02-01), Swain
patent: 5782374 (1998-07-01), Walker
patent: 145 641 (1980-12-01), None
patent: 681 01 275 U2 (1981-07-01), None
patent: 213 698 (1984-09-01), None
patent: 234 448 A1 (1986-04-01), None
patent: 263 795 A1 (1989-01-01), None
Hepting Emil
Muenster Torsten
Castellano Stephen
Korrotech GmbH u. Co. KG
Pendorf & Cutliff
LandOfFree
Galvanizing tank does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Galvanizing tank, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galvanizing tank will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2571103