Improvements in Automatic Electric Cut Out Devices for Electric Cooking Apparatus.
Year: 1899

page_text: Date of Application, 24th May, 1899
Complete Specification Left, 20th Feb., 1900-Accepted, 24th Mar., 1900
PROVISIONAL SPECIFICATION.
Improvements in Automatic Electric Cut Out Devices for Electric
Cooking Apparatus.
I, FRIEDRICH WILHELM SCHINDLER, of Kennelbach, near Bregenz, Austria,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention relates to electric cut out devices for electric cooking apparatus
of the kind in which the electric circuit of the apparatus is broken upon the
fusion of some soft solder which takes place automatically when the solder
attains the melting temperature due to the apparatus working empty, the object
being to protect and prevent injury to the cooking apparatus
In the known devices of the above kind the heavy heating body is soft soldered to
the bottom of the cooking vessel so that upon the fusion of the solder the heating
body falls down, but this arrangement has been found unsuitable in many
respects.
In this invention a suitable small piece of metal, for instance a screw stud or
the like, is soft soldered at one end to the bottom of the cooking vessel, indepen-
dently of and at a place not covered by the heating body. Carried and held by the
metal stud but insulated therefrom is a contact piece which is interposed in the
electric circuit passing through the heating body. Upon the soft solder attaining
the melting temperature the metal stud or the like is released from the bottom
of the cooking vessel and falls down and with it the contact piece whereby the cir-
cuit is broken and the cooking apparatus automatically put out of working.
Dated this 24th day of May 1899.
THOMAS R. SHILLITO,
15, Tooks Court, London, E.C.,
Agent for the Applicant.
Improvements in Automatic Blectric Cut Out Devices for Electric
Cooking Apparatus.
I, FRIEDRICH WILHELM SCHINDLER, 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 ascertained in and by
the following statement:-
-
This invention relates to electric cut out devices for electric cooking apparatus
of the kind in which the electric circuit of the apparatus is broken upon the
fusion of some soft solder which takes place automatically when the solder
[Price 821

page_text: attains the melting temperature due to the apparatus working empty, the object
being to protect and prevent injury to the cooking apparatus.
In the known devices of the above kind the heavy heating body is soft soldered
to the bottom of the cooking vessel but this method presents many disadvan-
tages both in construction and in practical working which disadvantages the
invention is designed to obviate. This end is attained by soft soldering to the
cooking vessel any suitable small piece of metal which can be completely separated
from the heating body and which, in the case of working empty, becomes released
in known manner from the cooking vessel whereby the electric circuit is broken.
The accompanying drawings shews, by way of example, one form of construction
of the device of the invention in part sectional view.
a is the cooking vessel which at the central part of its underneath surface is
uncovered by the heating body b. To this free part of the cooking vessel is soft
soldered a metal piece c which forms the head of a screw d of insulating material.
e is a screw nut of conducting material upon the screw d and bearing against a
metal ring firmly fixed in the heating body b and in conductive connection with
that end of the heating wire which passes through the heating body. A second
nut upon the screw serves to clamp the wire connecting with the fixed
contact h. The other end of the heating wire which passes through the heating
body is connected with the second fixed contact (not shewn). The bottom of the
cooking vessel surrounds a casing or ring k to which said contacts are attached.
Should the apparatus be set to work empty the bottom of the cooking vessel will
be heated so as to melt the solder by which the metal piece c is fixed, which latter
with the parts attached to it then falls down thus bringing the nut e out of
contact with the metal ring f whereby the electric circuit is broken.
If the fusion of the solder should be found to take place sooner or more quickly
than is desirable, this can be remedied by interposing between the bottom of the
cooking vessel and the metal piece an intermediate metal piece which is hard
soldered to the bottom of the cooking vessel and the metal piece c then soft
soldered to said intermediate piece.
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:-
An automatic electric cut out device for electric cooking apparatus in which
any suitable metal piece is soldered to the cooking vessel with soft solder which
metal piece becomes detached from the cooking vessel at the melting temperature
of the soft solder whereby the electric circuit is broken, substantially as described
and shewn.
THOMAS R. SHILLITO,
15, Tooks Court, London, E.C.,
Agent for the Applicant.