Electric resistance heating devices – Heating devices – Vaporizer
Patent
1999-04-01
2000-08-08
Paik, Sang
Electric resistance heating devices
Heating devices
Vaporizer
392390, 200292, 200 11DA, A01G 1306, A61M 1600, H01H 1958, H01H 900
Patent
active
061013153
DESCRIPTION:
BRIEF SUMMARY
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 a device has become known from EP 362 397 A1. It includes a toggle switch with two stable switching positions for switching the device on and off, one of said switching positions being normally the ON position and the other one the OFF position. Such conventional toggle switches comprise an operating element for operating a switching element which interrupts and interconnects two switching contacts. The operating element cooperates with a resilient element in such a way that two stable end positions for the switching element are obtained, the intermediate positions being unstable. The above-mentioned components of the toggle switch are mounted in a toggle switch housing, connection lugs, which are connected to the switching contacts, projecting beyond said housing. For fastening the toggle switch to the housing of the device, the toggle switch housing has resilient detent projections, protrusions or the like, which are adapted to be snapped in position in an opening provided in the housing wall.
These conventional toggle switches are considered to be disadvantageous insofar as they are composed of a large number of individual components which must either be mounted by troublesome manual labour or assembled by means of extremely complicated assembling devices. This results in high production costs. In addition, for electrically connecting the switch, it is necessary that pigtail leads are soldered onto the connection lugs of the switch, and this results in an increase in the production costs for the electric devices using such switches.
Furthermore, EP 696 457 A1 discloses an electric device for evaporating substances which has a switching means integrated in the attachment plug, said switching means consisting of two rotating joint members which are adapted to be brought into engagement with one another so as to establish an electric connection between the attachement plug contacts and an electric switching component.
Although the use of pigtail leads is no longer necessary in the case of this electric device, the production of the rotating joint members is still comparatively complicated. In addition, the operational comfort of the switching means is less high than that of a toggle switch where only two stable switching positions exist. The operator is, however, compelled to rotate the rotating joint members until a locking position has been found. Electric devices including a toggle switch are therefore more readily accepted because of their higher operational comfort.
Hence, it is the object of the present invention to further develop an electric device of the type in question, which includes a toggle switch, in such a way that it has a simple structural design comprising a small number of components and that it can be produced at a reasonable price.
This object is achieved by an electric device having the features of patent claim 1.
The idea underlying the device according to the present invention is that the switching element and the resilient element are implemented as an integral strip-shaped sheet-metal spring, one end piece of the strip being directly coupled to the operating element and the other end piece abutting on one of the contacts. Due to the fact that the strip-shaped sheet-metal spring includes an approximately 3/4-circular bend, it can simultaneously fulfil the function of the switching element establishing the contact as well as the function of the resilient element. This reduces the number of individual components included in the toggle switch and, at the same time, the material and mounting costs for the electric device.
In accordance with a preferred embodiment, one end piece of the strip-shaped sheet-metal spring is held between two driving pins arranged on the operating element. When the switch is being assembled, the strip-shaped sheet-metal spring can simply be forced into the gap between the driving pins. The operating elem
REFERENCES:
patent: 3558834 (1971-01-01), Zielke
patent: 3742171 (1973-06-01), Howe
patent: 5570777 (1996-11-01), Skarivoda
Paik Sang
Steinel GmbH & Co. KG
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