Electric heating – Heating devices – Resistive element: igniter type
Patent
1999-10-27
2000-10-10
Jeffery, John A.
Electric heating
Heating devices
Resistive element: igniter type
B60N 314
Patent
active
061304093
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a cigar lighter with a safety blade terminal, particularly for motor vehicles.
Such a cigar lighter is described in the French patent application published under number U.S. Pat. No. 5,932,126. It conventionally comprises a removable heating plug and a lighting body which accommodates the heating plug in a socket along an assembly direction. The bottom of the socket carries a bimetallic strip, with electrical insulation. A potential difference is created between the bimetallic strip and the socket for supplying electrical power to the heating plug.
The socket carries a safety blade terminal (more precisely, a safety bimetallic strip in U.S. Pat. No. 5,932,126, in electrical contact with the bimetallic strip, which is able to come into contact with a tag linked electrically with the socket in the event of inadvertent overheating in normal operation. In the event of overheating, the safety blade terminal is thus linked electrically to the socket which causes a short circuit which entails blowing of the fuse provided in the vehicle in the power supply circuit of the cigar lighter.
Thus effective protection is achieved against overheating which does not require the cigar lighter to be dismantled in order to re-establish operation thereof, since it is sufficient to change the fuse corresponding to the power supply circuit of the cigar lighter.
BRIEF SUMMARY OF THE INVENTION
The invention aims to improve cigar lighters of this type, particularly by reducing their axial bulk along the assembly direction, while further protecting the safety blade terminal from external attacks which it might suffer (dust, ashes, mechanical damage, etc.).
In order to do this, the invention proposes a cigar lighter of the above-described type, characterised in that it comprises a safety contact accommodated in the socket and which extends essentially transversely to the assembly direction, in that the safety contact and the bottom of the socket define a safety space between them, along the assembly direction, and in that the safety blade terminal extends into the safety space essentially transversely to the assembly direction.
Advantageously, strip; and the bimetallic strip, the bimetallic strip holder exhibits at least one hollow space which opens out into the face of the bimetallic strip holder turned towards the bottom of the socket and the safety blade terminal is accommodated in the hollow space; the socket, at least one countersink in which the safety contact is accommodated; said orifice is masked by the safety contact; axes; element which also makes it possible to fix the bimetallic strip, the safety blade terminal and the bimetallic strip holder onto the socket; directed along the assembly direction.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention will now be described by reference to the attached drawings in which:
FIG. 1 represents a sectional view of a part of a cigar lighter in accordance with the teachings of the invention;
FIG. 2 is the section along the line II--II of FIG. 1;
FIG. 3 is an exploded view of the lighting body of a cigar lighter in accordance with the teachings of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The cigar lighter, part of which is represented in FIG. 1, conventionally comprises a removable heating plug and a lighting body 2 which accommodates the heating plug in a socket 4 along an assembly direction. The bottom 6 of the socket 4 internally carries a bimetallic strip 10, with electrical insulation.
According to a conventional design, set out for example in the document U.S. Pat. No. 5,932,126 to which reference may be made for further details, the heating plug comprises a heating cup, in engagement in the bimetallic strip 10 during the phases of heating and spaced away from the bimetallic strip 10 by return means such as a spring outside the heating phases.
As represented in FIG. 3, the cigar lighter body 2 comprises a thermal screen or masking socket 3 which accommodates the socket 4, a
REFERENCES:
patent: 3560705 (1971-02-01), Mendenhall
patent: 4190763 (1980-02-01), Seibel et al.
patent: 4236061 (1980-11-01), Fenn et al.
patent: 4449036 (1984-05-01), Seibel et al.
patent: 4650962 (1987-03-01), Pramaggiore
patent: 5233162 (1993-08-01), Gaisberg et al.
patent: 5493098 (1996-02-01), Diederich
patent: 5932126 (1999-08-01), Thivet
patent: 5998763 (1999-12-01), Mattis et al.
Batut Pierre Henry
Texier Gerard
Jeffery John A.
Valeo Vision
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