Improvements in the Manufacture of Fabrics for Incandescence Mantles for Illuminating Purposes.
Year: 1897

page_text: Date of Application, 11th Nov., 1897-Accepted, 11th Dec.,"
•1897
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Fabrics for Incandescence
Mantles for Illuminating Purposes.
I, JULIUS JANZ, Manufacturer, of 5, Grüner Weg, Berlin, 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 an l
by the following statement:-
It has hitherto been the practice to strengthen the upper edge or head of
the fabric of tubularly woven incandescence mantles, and to thus render them
more durable by either simply hemming them or, what was still more efficient,
by internally and externally binding them with strips of net or tulle. It is found
in practice, however, that this kind of strengthening is utterly insufficient, as,
almost all mantles which are subject to injury from external causes, for instance
by concussions, breaks, sometimes at their heads directly below the strengthened
part, but in the majority of cases at the place where the asbestos thread for the
suspension loop is drawn through. This method of manufacturing them is
moreover more expensive, causes them to be soiled, and, not unfrequently, to
become distorted owing to the sewing operation. A further consequence of such
distortion is that the mantle glows irregularly and wears unevenly.
defects are efficiently prevented by this invention.
Such
This is
According to this invention the mantles with their strengthened head portions
are ready woven in any length and size upon the machine itself.
obtained by either forming firmer or closer meshes, or by reinforcing or doubling
the thread, or lastly by forming the meshes more firmly and simultaneously using
a stronger or a doubled thread. In this operation the transition from the even
part to the strengthened head portions may be either gradual or direct. - A
gradual transition may be so attained that a short piece of somewhat closer
formation of meshes produced by the same thread is inserted, or a short piece
retaining a uniform formation of meshes but of somewhat thicker thread is
inserted, or finally, a short piece of closer formation of meshes made of thicker
thread; in each case analogous to the kind of head required. In this manner,
mantles are obtained with very durable heads and are of a very elegant and
uniform shape, while the subsequent sewing operation for strengthening the
head, and the defects resulting therefrom are avoided. It has been found from
careful experiment that a breaking of the head under conditions, which mantles
of ordinary construction were unable to resist, is rendered practically impossible
in mantles constructed according to this invention.
The asbestos thread for the suspension loop may be either simply drawn
through the strengthened head portions, or the head portion may be turned down
half way and subsequently receive the asbestos thread.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
A method of manufacturing durable head pieces in incandescence mantles in
such a manner that the head portions are woven, directly on the machine, by

page_text: using either a closer formation of meshes; a stronger or a doubled thread; or
a stronger formation of meshes and simultaneously a thicker or a doubled thread,
while at the same time a gradual transition from the even part to the
strengthened head portion can be obtained by inserting an intermediate piese
of somewhat greater firmness or greater thickness of thread or of somewhat
greater firmness and greater thickness of thread than the even part.
Dated this 11th. day of November 1897.
WHEATLEY & MACKENZIE
40 Chancery Lane London W.C. Agents.