Receptacles – Flaccid wall material permanently united with a skeletal...
Reexamination Certificate
2000-09-25
2001-06-12
Moy, Joseph M. (Department: 3727)
Receptacles
Flaccid wall material permanently united with a skeletal...
C220S009400, C220S639000
Reexamination Certificate
active
06244453
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improved cistern specifically designed for holding and carrying liquids.
As known, liquid holding and carrying cisterns must meet a plurality of rather strict requirements, in order to be certified as suitable for public use.
The above requirements, in particular, are very stringent for those cisterns specifically designed for carrying liquids in general, such as food and industrial liquids, because of a great variation of the specific gravity thereof, affecting the stress the holding and carrying cistern is subjected to.
These stress values, in fact, vary from 0.8-0.9 to less than 2 Kg/m
3
, and, since the cisterns of the above mentioned type have a volume of several cubic meters, weight variations of the order of tons will occur.
Prior cisterns for the intended applications conventionally comprise a bottom pallet, thereon is fastened a metal outer cage, encompassing a holding tank usually made of a plastic material and fastened to the top of the cage, for example by two or more metal cross-members.
While the above mentioned prior cisterns solve the indicated technical problem, they, however, are affected by the following disadvantages.
The metal pipes forming said outer cage have contours which are not suitable for mating the operating conditions of automatized lines. In particular, great problems are encountered for automatizing the welding operations provided for firmly fastening the cage forming pipes at crossing points thereof.
Actually, in the prior art, the mentioned cage forming pipes are welded by manually controlled welding apparatus, thereby greatly increasing the welding time and cost, because of a substantial requirement of manual labour.
Moreover, the quality controls too are performed by manually controlled implements, thereby they will require a lot of labour, and, moreover, being scarcely reliable.
In this connection it should be pointed out that a critical aspect of the above mentioned quality controls is that related to the mentioned welding operations proper, since the welded regions must overcome very rigorous and accurate control tests; thus, in prior cistern making methods, the above mentioned quality controls will require a very long time with a consequent negative effect on the cistern making cost.
The document EP-A-0 755 863 discloses a cistern substantially according to the preamble of claim
1
.
SUMMARY OF THE INVENTION
Accordingly, the aim of the present invention is to overcome the above mentioned drawbacks affecting the prior cisterns and making methods therefor.
For achieving the above mentioned aim, the invention provides an improved cistern, specifically designed for holding and carrying liquids, which can be easily made on automatic assembling lines, in which the quality controls can be automatically performed in a very quick and efficient manner, thereby providing a safe, reliable product, of a comparatively small cost, and adapted to meet any enforcing constructional rules.
Briefly, according to the invention, an improved cistern specifically provided for holding and carrying liquids has been provided, said cistern comprising supporting means, a tank and tank holding means, said tank holding means being operatively connected both to said supporting means and to said tank, in which said tank holding means comprise a metal cage formed by a plurality of crossing metal hollow pipes having a quadrilateral cross-section, the horizontally arranged pipes or bars having an asymmetrical contour, while the vertically arranged pipes or posts have a symmetrical contour.
The improved cistern, specifically designed for holding and carrying liquids according to the invention, is characterized by that characterizing features of the enclosed claim
1
.
The improved cistern, specifically designed for holding and carrying liquids according to the invention, provides the following advantages.
The cross-section contours or profiles used for the metal pipes forming the aforesaid cage are very suitable for processing on automatized processing lines, in particular for automatic welding lines for performing the welding operations for welding the crossing points or regions of said pipes, which welding operations, according to the invention, can be performed in a very accurate and quick manner.
Accordingly, the quality controls too can be performed in a very quick and accurate manner, in particular those controls related to the welded points or regions: thus, the made product will be very reliable and it will meet all of the strict enforcing constructional rules.
Finally, the making cost will be comparatively small, owing to the great cost reduction deriving from the very reduced labour required for constructing the cistern according to the invention; thus, the inventive cistern will be very competitive from a mere economic standpoint and, moreover, it will have a very high quality.
REFERENCES:
patent: 2019044 (1935-10-01), Brown
patent: 4909387 (1990-03-01), Schutz
patent: 5024346 (1991-06-01), Rosger
patent: 5058747 (1991-10-01), Decroix et al.
patent: 5437384 (1995-08-01), Farrell
patent: 5653354 (1997-08-01), Olson
patent: 5746343 (1998-05-01), Waltke et al.
patent: 6095361 (2000-08-01), Huang
patent: 297 19 830 U (1998-05-01), None
patent: 0755863 (1997-01-01), None
Hedman & Costigan ,P.C.
Moy Joseph M.
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