Year: 1887

page_text: Date of Application, 23rd Dec., 1887
Complete Specification Left, 7th July, 1888
Complete Specification Accepted, 17th Aug., 188
both Sides.
I HUGO HARTUNG of 41 Prenzlauer Allee Berlin, Kingdom of Prussia, German
Empire, merchant, do hereby declare the nature of this invention to be as follows:-
My invention consists of improvements in fire-bars with polygonal projections on
both sides and refers to improvements in the fire-bar itself and also to the connection
of the polygonal projections with the web or center rib of the fire-bar.
These improvements are intended for giving the air a certain pressure, when the
same is passing between the bars and through the conical channels, being wider at
the botton than at the top and formed between the projections and the neighbouring
bars. By this manner the air is introduced into the fire in a pressed state and also
more thoroughly heated, as by means of the new connection of the projections with
the web or rib of the fire-bar a larger surface of contact of the air with the fire-bar is
given. This new connection of the projections with the web of the fire-bar ensures a
longer durability of the same.
The whole fire-grate is constructed of a certain number of fire-bars which are at
their upper part in equal distances provided with slots. Between these slots and on
the upper part of the web I place the conical projections in such a manner that their
largest parts remain at the top of the web and their smallest parts extend to and lay
fast on to the bottom of the web.
The different bars are so placed one aside another that the projections of the first
bar are opposite those of the third, the projections of the second opposite those of the
fourth.
By these means I attain a number of conical channels, which are larger at the
bottom and smaller at the top and which correspond to the number of projections.
Through these conical channels the air is pressed into the fire.
As mentioned before I also attain a larger surface of contact on the fire-bar whereby
the combustion-air is more thoroughly heated.

page_text: The combustion air, passing through such fire-bars will at no place be turned off,
as it happens in most of the similar constructions hitherto known, but will always
freely reach the fire and in the same direction.
HUGO HARTUNG.
By A. Kuhnt & R. Deissler,
Attorneys.
COMPLETE SPECIFICATION.
Improvements in Fire-bars with Polygonal Projections on
both Sides.
I, HUGO HARTUNG, of 41 Pranzlauer Allee Berlin, Kingdom of Prussia, German
Empire, merchant, 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 :-
My invention relates to improvements in fire-bars, in which the bar is provided
with a number of polygonal shaped divisions which taper from the top of the bar to
nothing, or run into the bar, in conjunction with peculiar shaped air passages between
each of the polygonal shaped divisions, and the object of my improvement is that the
air passing through the peculiar formed air passages and between each division of the
bar, is in a manner compressed, as when the bars are lying close together the divisions
form conical shaped tubes, and the air being heated by the fire on the top of the grate
the air from the ash pit is drawn, at a great velocity through these passages and is
greatly heated before entering the furnace, by coming into close contact with such a
large surface of the fire bars, which means a great saving in coal which would be
necessary to heat the cold air entering the furnace, and also the bars last longer as
they are not burnt away so quickly, on account of the free circulation of air between
them.
I attain these objects by the form of bar illustrated in the accompanying drawings-
in which

page_text: Fig. 5 is a section through line we fig. 4 of the modified form of bar as seen
from C.
Fig. 6 is a section through line y z fig. 3 as seen from E.
Fig. 7 is a plan of the modified form of the improved bar.
Similar letters denote similar parts throughout the several views.
In fig. 3 it can be seen that the bar is divided as it were into a number of polygonal
shaped divisions A which ou reference to fig. 1 it will be seen how these divisions
taper or run into the body of the bar at a and so forming, when two bars are placed
together, tapering spaces through which the air flows to the grate, in order to
help the flow of air, and also to give it more heating surface on the fire bar, there
are the peculiar hollow shaped air passages B between each polygonal shaped
division.
Fig. 4 shows an elevation of a modified form of the improved fire-bar in which the
surface of the polygonal shaped divisions A are slanted away on alternated sides cc,
as seen in figs. 5-6-7.
The advantage of this is that the coal lying on the bars does not lie on these slanted
surfaces cc, or in other words, these slanted surfaces form hollows under the coal
lying on the grate, and thus let the air in better contact with the coal and thus aid
combustion.
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
1 claim is:
1) In a fire bar, having the polygonal shaped divisions A, which taper into the
body of the fire bar at a for the purpose as described.
2) In a fire bar having the polygonal shaped divisions A which taper into body of
the fire bar at a in combination with the peculiarly formed air passages B between
each division for the purpose as described.
3) In a fire bar having the polygonal shaped divisions A which taper into body of
the fire bar at in combination with the peculiarly formed air passages B between
each division and the alternated slanting surfaces c for the purpose as described.
Dated this 5th day of July 1888.
Dated this oth day of July 1888.
HUGO HARTUNG.
By A. Kuhnt & R. Deissler,
38, Alexander Strasse, Berlin C. Germany,
His Attorneys.