Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
2000-04-25
2001-05-15
Walberg, Teresa (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C219S537000
Reexamination Certificate
active
06232581
ABSTRACT:
This application is the national phase under 35 U.S.C. § 371 of PCT International Application No. PCT/EP98/07874 which has an International filing date of Apr. 25, 2000, which designated the United States of America.
1. Field of the Invention
This invention relates to a connection flange for an armoured resistance element.
2. Description of the Prior Art
Armoured resistance elements are known for heating electric ovens. Specifically, the armoured resistance element consists of a resistive electric wire housed in a metal sheath and separated therefrom by an interposed dielectric material, such as magnesium oxide. The ends of the metal sheath are generally straight and parallel and engage in corresponding holes provided in a stainless steel, iron or aluminium flange which is fixed to the oven muffle on mounting the resistance element.
The flange is constructed by stamping and is often provided with a plurality of prewelded or preformed screws to be inserted into holes provided in the muffle and engagable by corresponding nuts. In many case there is also welded to the flange a flat lug engagable by a push-on connector provided on the muffle edge to together form continuity elements for the earthing contact.
These known flanges have however certain drawbacks and in particular:
a substantial production cost due to the provision of the screws and nuts and to the work involved in fixing the screws and lug to the flange,
time lost in effecting this work,
insufficient product quality in the sense that the screws and lug can twist or separate from the flange during transportation, or the screw threads can be damaged during the tightening of the nuts,
a large number of rejects/returns by the manufacturer account of the aforesaid problem.
object of the invention is to eliminate these drawbacks by providing a flange for resistance elements which can be easily fixed to the oven muffle without requiring the provision of screws.
A further object is to provide a low-cost flange easily constructed by stamping.
BRIEF SUMMARY OF THE INVENTION
These and further objects are attained according to the invention through A connection flange for an armoured resistance element, particularly for electric ovens, comprising a plate provided with a plurality of holes for insertion by end portions of said armoured resistance element, wherein minor edges of said plate are prolonged into at least two profiled flat fins with their sides diverging outwards, said fins being formed during actual stamping of said plate and then being bent at 90° to be inserted into corresponding slots provided in said edges of said oven, after which they are twisted to prevent their withdrawal.
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Birch & Stewart Kolasch & Birch, LLP
Fastovsky Leonid
I.R.C.A. S.P.A. Inoustria Resistenze Corazzate E Affini
Walberg Teresa
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