Sheet metal container making – Method – Assembling receptacle with closure
Patent
1995-11-27
1997-08-19
Crane, Daniel C.
Sheet metal container making
Method
Assembling receptacle with closure
413 8, 72333, 72348, 72256, 210440, B21D 5144
Patent
active
056581122
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a process for manufacturing a single-component cover for filters for vehicles, particularly for oil filters, and to the cover produced through this process.
FIGS. 1 to 3 show a cover 10 produced according to the prior art, to be used on an oil filter to cover it according to well-known operating techniques and principles.
In particular, the cover 10 is composed of a central part 11 of a circular shape, and centrally open in order to form a threaded opening 12, through which the filter will be screwed to the block. The cover is then equipped with a thinner external ring 13, that is used for seaming to the cup 14 containing the filtering cartridge. Such seaming occurs at point 16 shown in FIG. 3.
The cover is then equipped, in a known way, with a plurality of holes 18 for the passage of oil.
The cover 10 must have two well-defined operating properties:
1) the thickness of the cover 10 itself must be adequately high (of the order of 1.7/3 mm) in the central threaded part 12 thereof, to support high pressures occurring during its operation; in particular, the cover 10, during design, must be resistant to bursts to which it is subjected during pulsating tests;
2) the thickness of the cover 10 must instead be adequately thin (of the order of 0.8 mm) in the external annular part thereof, where the cover 10 must be bent in order to seam it to the filter cup 14, so that the filter itself can be completely closed.
In order to realize a cover having two different thicknesses, applying the prior art, two different components are used, of materials commonly known as P04 and P13, where the two numbers following letter P are determined by the different carbon compositions therein and by other properties. The P04 component, about 0.6 m thick, is normally used to make the external ring 13, while the P13 component, about 2.5 mm thick, is normally used to make the central threaded part 12 of the cover 10. The two components, separately produced with two known pressing processes, are then welded together, through a third welding process, at points 20 and 22 in FIG. 2. As appears from what has been described before, the procedure to produce covers for oil and other types of filters has always been cumbersome and costly, since it employs two different types of material and several intermediate steps.
Purpose of the present invention is solving the above-said problems, providing a process for manufacturing a cover for oil filters and other types of filters that meets the above-listed operating requirements, and at the same time can be manufactured using a single starting component or blank and employing a unique, linear procedure that can be easily realized and has a reduced cost.
This cost reduction is obtained also because the manufactured product does not need any heat treatment.
The above and other purposes and advantages of the invention, such as those resulting from the description below, are obtained through a process for manufacturing a single-component cover for filters for vehicles, particularly for oil filters, as claimed in claim 1.
The present invention also relates to the cover produced through one of the above-listed processes: this cover shows the advantages of a high resistance to pressures and of an easy seaming and it is simple and inexpensive to manufacture, since it does not require any heat treatment. The cover can be used both for fuel filters and for oil filters for vehicles.
The present invention will be better described by some preferred embodiments thereof, given as a non limiting example, with reference to the enclosed drawings, in which:
FIG. 1 is a top view of a cover for an oil filter for vehicles;
FIG. 2 is a side-sectional view of the cover according to the prior art, carried out along line II--II in FIG. 1;
FIG. 3 is a side view of an oil filter for vehicles with the cover of FIG. 1 seamed to the filter containing cup;
FIGS. 4 to 7 show the successive steps of a first alternative process for manufacturing covers for filters according to the present invention;
FIG.
REFERENCES:
patent: 2460721 (1949-02-01), Thompson
patent: 2980993 (1961-04-01), Lyon
patent: 4421444 (1983-12-01), Hanley
patent: 5295304 (1994-03-01), Ashley, Jr.
Borasio Franco
Fassio Sergio
Crane Daniel C.
Tecnocar S.R.L.
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