US 1946434 A
Description (OCR text may contain errors)
Feb. 6, 1934. H. EACH ELECTRIC CIGAR LIGHTER Filed Nov. 5. 1930 Patented Feb. 6, 1934 UNITED STATES PATENT OFFICE Application November 3, 1930, Serial No. 493,208, and in Germany November 4, 1929 3 Claims. (c1. 219 32) The present invention relates to an incandescent body for electric cigar lighters which differs from the known bodies for the purpose in question, in that it consists of two or more in- 5 candescent bands located one above the other and formed of a resistance material, for example a chrome nickel alloy, which bands are at their ends conductively connected together and to connecting members, the bands being thus arranged in parallel, these bands being also rolled together or assembled so as to form a closed incandescent surface. The use of two or more incandescent bands enables the necessary cross section of the resistance material to be split up 5 or subdivided. The bands thus become thinner and softer than when using a single band. They can consequently be wound more conveniently and more easily. This is of particular importance if it is desired to use as insulation simply 9 the thin oxide layers of the incandescent bands, without the use of separate interposed layers of insulating material. When using two or more thin and soft bands'the fine oxide layer thereon is protected during the rolling or assembling 5 of. the bands and damage thereto is prevented as the separate bands may move or slide relatively to one another independently of one another.
This facilitates at the start the manufacture of the incandescent bodies when drawing tight- 1y two or more layers over one another. A direct passage oi current between the separate layers is also prevented as in all cases there are two or more oxide layers between the current conducting layers.
Instead of using only the oxide layers of the resistance bands for insulating the separate layers from one another it is also possible to use separate intermediate layers of insulating material such as, for example, thin mica or the like. It is, however, always essential to produce the incandescent body from two or more bands placed one upon the other and arranged in parallel in comparison with the single thicker band hitherto usual, as the thin bands are more pliant and can be wound around one another and drawn around one another more easily. Ihe incandescent body with a base insulation is fitted into a plate-shaped supporting body, and by means of the ends of the separate incandescent bands is conductively connected to the rim of the supporting body. In the rim of the plate-shaped supporting body are provided air passages which are preferably located above the top of the incandescent body so that the air which passes through does not cool the incandescent body too much. The incandescent bands are preferably clamped by means of their inner ends in a slot of the head of a securing bolt, arranged centrally in the bottom of the supporting body through which it passes centrally, and which is go insulated from the supporting body. The ends of the bands are wound around the head. of the bolt in such a maner that they bear closely against one another and by means of their upwardly directed edges form a closed incandesg5 cent surface.
The invention will now be described with reference to the accompanying drawing in which there is shown an example of construction of the new incandescent body consisting of two incan-- 7 descent bands bearing against one another and solely insulated from one another by their oxide layers.
Figure 1 shows a longitudinal section, and
Figure 2 shows a plan.
it indicates a plate-shaped supporting body of sheet metal and b the securing bolt which is passed centrally through the bottom thereof and insulated therefrom. Into a longitudinal slot of the head of the securing bolt are fitted two incandescent bands 0, c of suitable resistance material, for example a chrome nickel alloy which are coated with oxide with the exception of their ends forming connecting or terminal portions. These bands are wound spirally around the head of the bolt in such a manner that they bear closely against one another along their whole length and form a closed incandescent surface by means of their upwardly directed edges. Their outer ends bent at an angle are passed through an opening in the rim of the plate shaped supporting body a and are conductively connected to the supporting body on the inside thereof. The connection is effected by means of a small rivet 11. Between the bottom of the plate-shaped supporting body and the actual incandescent body is fitted a bottom e of insulating material. The rim of the plate-shaped supporting body a is provided with openings 1 for the passage of air, these openings being located above the'iree incandescent surface of the actual incandescent body.
The incandescent body described is characten ised by a very high intensity of its incandescent action as also by its great resistance, easy manufacture and great durability.
I claim as my invention:-
1. A cigar lighter comprising a resistance unit composed of a plurality of bands of resistance lit iii];
from end to end and also arranged spirally so that the convolutions are in mutual contact, said convolutions being provided with an insulating coating film of oxide to prevent short circuiting, the outer ends of said bands being electrically connected to the body, the convolutions of the band being insulated from the body and the inner ends of the bands being electrically connected to the bolt, the latter being arranged in the center of the spirally formed portions of the band.
3. A cigar lighter comprising a sheet metal substantially saucer shaped body, a bolt extending through an opening in the bottom of said body and insulated therefrom and a resistance unit in said body and comprising a plurality of bands of resistance material arranged in mutual contact from end to end and also arranged spirally so that the convolutions are in mutual contact, said convolutions being provided with an insulating coating film of oxide to prevent short circuiting, the outer ends of said bands being electrically connected to the body, the convolutions 01 the band being insulated from the body and the inner ends or the bands being electrically connected to the bolt, the latter being arranged in the center of the spirally formed portions of the band and provided with a transverse keri in which the inner ends of the plurality of bands are secured.