Improvements in the Manufacture of Electrical Resistances of Metal Foil.
Year: 1897

page_text: Date of Application, 4th Dec., 1897
Complete Specification Left, 7th July, 1898-Accepted, 13th Aug.,
1898
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Electrical Resistances of
Metal Foil.
I, HUGO HELBERGER, Engineer, of Thalkirchen, near Munich, in the Empire of
Germany, do hereby declare the nature of this invention to be as follows:-
This invention relates to a method for producing an electrical resistance, which
besides durability, simplicity in production and the small space it occupies with
high electric resistance, possesses the highest heat radiating power and solidity.
This resistance can be used for electric heating apparatus, as also for other
general uses, such as for resistances for measuring apparatus and dynamos.
The method of producing these resistances is as follows:
A metal foil is laid on card board of incombustible material, as for instance
asbestos, when the resistance has to undergo or develop high temperature, or on
ordinary paper card board or the like, when the resistance developes only a little
heat; this metal foil is then pressed into the said card board by means of high
pressure and by any punch, exactly in the same manner as book binders tool or
press gold letters or designs on book covers.
The punch presses the metal layer strongly into the under layer and the remain-
ing metal can easily be removed.
According to the construction or form of the punch there is produced on the card
board an adherent extremely thin metal layer, which being a little sunk in and
thus protected is appropriate for use as electrical resistance by connecting it in
circuit by means of pressure clamps.
Dated this 4th day of December 1897.
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, London.
Improvements in the Manufacture of Electrical Resistances of
Metal Foil.
I, HUGO HELBERGER, Engineer, of Thalkirchen, near Munich, in the Empire of
Germany, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement:
-
This invention relates to a method for producing an electrical resistance, which
besides durability, simplicity in production and the small space it occupies with
high electric resistance, possesses the highest heat radiating power and solidity.
CD
017

page_text: This resistance can be used for electric heating apparatus, as also for other
general uses, such as for resistances for measuring apparatus and dynamos.
The method of producing these resistances is as follows:
A metal foil is laid on card board of incombustible material, as for instance
asbestos, when the resistance has to undergo or develop high temperature, or on
ordinary paper card board or the like, when the resistance developes only a little
heat; this metal foil is then pressed into the said card board by means of high
pressure and by any punch, exactly in the same manner as book binders tool or
press gold letters or designs on book covers.
The punch presses the metal layer strongly into the under layer and the remain-
ing metal can easily be removed.
According to the construction or form of the punch there is produced on the card
board an adherent extremely thin metal layer, which being a little sunk in and
thus protected is appropriate for use as electrical resistance by connecting it in
circuit by means of pressure clamps.
Referring to the drawing annexed-Fig. 1 is a plan and Fig. 2 a section a is
the support of asbestos, card board, or other convenient material, b the metal foil
tooled or punched in.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
An improved manufacture for producing an electric resistance of metal foil,
whereby the latter is pressed into a suitable under layer or support.
Dated this 7th day of July 1898.
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, London.