Improvements in Electric Heaters.
Year: 1897

page_text: Improvements in Electric Heaters.
I, FRIEDRICH WILHELM SCHINDLER-JENNY, of Kennelbach, near Bregenz,
Austria, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The electric heater of this invention comprises a cast metal housing in which
a core is formed by pouring therein molten metal up to the point where the heat-
ing wires protrude. The whole is therefore in one piece the core not being
removable. The poured metal also covers the insulating body and in shrinking
presses said insulating body on all sides and so as to prevent the formation of
vacant spaces between the insulating body and the metal housing.
Dated this 16th day of December 1897.
THOMAS R. SHILLITO,
89, Chancery Lane, London, W.C., Agent for the Applicant.
Improvements in Electric Heaters.
I, FRIEDRICH WILHELM SCHINDLER-JENNY, of Kennelbach, near Bregenz,
Austria, Manufacturer, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to electric heaters of the kind in which a refractory in-
sulating body receiving the electric heating means, such as wires, is enclosed in a
metal housing and refracts the heat on to and through said housing.
Hitherto it has been customary to enclose the refractory body in a housing
constructed of parts attached together after they have been placed around the
refractory body. This method is laborious and costly and does not insure a
durable tight fit of the refractory body within the housing.
The object of the invention is to remedy the above disadvantages by providing
a cheaper, firmer, more durable and efficient construction. This object is attained
by using the refractory body as a core and casting the metal housing upon it
after the heating wires have been placed in position. The same object is also
attained when the metal housing is cast so as to leave one side of the refractory
body or core uncovered, for instance, that side from which the heating wires
protrude.
'
In the accompanying drawing the electric heater of the invention is shewn,
by way of example, in the form of a smoothing iron, Fig. 1 being a longitudinal

page_text: section thereof, Fig. 2 a cross section taken close to the right hand end of Fig. 1,
and Fig. 3 a similar view but modified in the manner that the housing is open
at top.
a is the refractory body receiving the heating wires b¹, 62. c the metal housing
cast in one piece upon the refractory body so as to enclose it on all sides as
shewn in Figs. 1 and 2 except at the place where the heating wires protrude,
or as shewn in Fig. 3, so as to enclose it except at one side or surface where it is
left completely uncovered by the housing.
The metal housing cast upon the refractory body shrinks so as to press and
grip said body on all sides and prevent the formation of vacant spaces between
the refractory body and the metal housing thus insuring a good air tight and
water tight fit between the same, whereby the wires being protected against
oxidation the cheaper kinds of such wires may be employed and thus save
expense.
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:-
-
In electric heaters the enclosing of the refractory insulating body receiving
the heating wires or the like in a metal housing by casting metal upon said
refractory body as a core, substantially as described and shewn.
Dated this 13th day of September 1898.
THOMAS R. SHILLITO,
15, Tooks Court, London, E.C., Agent for the Applicant.