Electric resistance heating devices – Heating devices – Vaporizer
Patent
1999-12-13
2000-11-14
Paik, Sang
Electric resistance heating devices
Heating devices
Vaporizer
219536, A61M 1600, H05B 306
Patent
active
061481432
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention refers to an electric device for evaporating substances, perfumes or the like, according to the generic clause of patent claim 1.
Such devices have become known from EP 686 457 A1 and EP 695 553 A1.
The device described in these two applications comprises a two-part electric circuit consisting of two stamped sheet metal components embedded in plastic material by means of injection moulding and placed one on top of the other. When this device is being produced, an integral stamped sheet metal component is embedded in plastic material by means of injection moulding and separated into two parts before it is mounted. Furthermore, projecting parts of the stamped sheet metal component must be cut off and bending operations are required so as to be able to establish an electric connection between the two superimposed parts. Finally, a mechanical connection must be established between the circuit components, e.g. by means of a pushed-on metal clip. These additional operating steps constitute a substantial cost factor in mass production and especially the fact that one part has to be placed on top of the other requires either highly complicated positioning means or expensive manual labour.
It is therefore the object of the present invention to further develop a device of the type mentioned at the beginning in such a way that it can be produced as simply as possible and at the lowest possible price.
BRIEF DESCRIPTION OF THE INVENTION
In the electric device according to the present invention the stacked circuit components are coupled mechanically as well as electrically by means of an integrally formed stamped sheet metal component. When the device is being mounted, one circuit component is simply folded onto the other, the mechanical coupling uniting the circuit components like a hinge. Hence, it is not necessary to take hold of two separate circuit components and to position them relative to one another, as has to be done in the case of the prior art. Due to the mechanical coupling, the additional clip required for keeping the circuit components together is no longer necessary either.
The integrally formed stamped sheet metal component also provides an electric connection between the two circuit components; said electric connection required additional bending operations in the prior art.
It follows that the device according to the present invention consists of a smaller number of parts, it has a less complicated structural design and it can be assembled much more easily; this will result in substantial advantages with regard to production costs.
In accordance with a preferred embodiment, at least one injection moulded part has formed therein openings for accommodating discrete electric components, whereby the circuit can be equipped more easily.
In particular, it will be advantageous when the openings provided in one injection moulded part have associated therewith complementary protruding retaining projections which are provided on the other injection moulded part, since this will have the effect that, when one circuit component is folded onto the other, the connecting wires of the components will clampingly be held between said retaining projections and the stamped sheet metal component. It follows that, when the circuit is being equipped with electric components, neither soldering nor spot welding is required for providing an electrically conductive connection between the connecting wires of the components and the stamped sheet metal component.
According to a preferred embodiment, at least one injection moulded part has formed therein openings which are adapted to be brought into locking engagement with complementary retaining projections on the other injection moulded part. This will facilitate exact positioning of the two circuit components and provide a snap connection which is easy to establish.
In accordance with a further preferred embodiment, the device is provided with electric connecting pins extending into the interior of the housing. For providing
REFERENCES:
patent: 4728779 (1988-03-01), Kotani et al.
patent: 4874924 (1989-10-01), Yamamoto et al.
patent: 5556192 (1996-09-01), Wang
patent: 5647053 (1997-07-01), Schroeder et al.
patent: 5940577 (1999-08-01), Steinel
Paik Sang
Steinel GmbH & Co. KG
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