Method of Heating Electrically-propelled Tramway Cars and other Vehicles.
Year: 1898

page_text: Date of Application, 26th Nov., 1898 - Accepted, 7th Jan., 1899
COMPLETE SPECIFICATION.
Method of Heating Electrically-propelled Tramway Cars and other
Vehicles.
·
We, OTTO BRENNECKE, Merchant, and IGNAZ TIMAR, Merchant, both of 187,
Friedrichstrasse, Berlin, 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;-
-
The present invention relates to a method of heating electrically propelled
tramway cars and other vehicles, which is distinguishable by its simplicity from
other heating systems and in particular from mixed systems of working, that is
to say working with accumulators and external conductors, and at the same time
by the fact that the accumulators need not be used also for heating and conse-
quently their wear and tear will be considerably lessened.
The main feature of the invention consists in providing so-called "thermo-
phores" of large size under the seats or in other suitable places, suitably connect-
ing these "thermophores" to the source of current from which the accumulators
are charged, and simultaneously charging the said "thermophores" also, as it
were, with heat, by melting a salt such as acetate of soda and the like or other
compound or mixture contained in the " thermophores," by means of heat pro-
duced by a current in a conducting spiral embedded in the mass in order that
the heat which is absorbed or rendered latent in the thermophores may be given
up for use, for the purpose of heating the interior of the cars.
The thermophores may be constructed and charged in any suitable manner and
all auxiliary appliances may be employed therewith which are generally neces-
sary or may be found useful in order to ensure the efficient working of the ther-
mophores. Similarly the mode of connection of the thermophore cells with one
another and with the source of current may be effected in any suitable manner.
The main feature is, however, that during the period of charging the accumu-
lators the latter receive their current exclusively for the purpose of working the
motors, and that the thermophores receive their current exclusively for the pur-
pose of storing up heat for the purpose of heating the cars, so that the accumu-
lators can be always discharged uniformly for working the motors without regard
to the variations in the consumption of heat for heating purposes. In this
manner the accumulators can be utilized in the most economical manner.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is:-
The herein described method of heating electrically propelled tramway cars and
other vehicles by the employment of large "thermophores" of suitable construc-
tion and charge placed under the seats or in other suitable places, and contain-
ing a heat absorbing substance which is caused to melt by the heat generated by
the passage of the current through an embedded spiral the arrangements being

page_text: such that the current is passed through this spiral whilst the accumulators for
working the motors are being charged, so as to ensure the most economical
working.
1 11.
1
1
1000
main
4445
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.