A New or Improved Fire Bar for Furnaces.
Year: 1892

page_text: Date of Application, 9th Nov., 1892-Accepted, 10th Dec., 1892
COMPLETE SPECIFICATION.
A New or Improved Fire Bar for Furnaces.
I, AUGUST KULBROCK of 21 Barutherstrasse, in the City of Berlin in the
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 :-
This invention relates to fire bars such as are used in boiler and similar furnaces.
and its object is to enable the burnt or otherwise similarly damaged parts of such
fire bars to be easily replaced without replacing the whole bar.
For this purpose the upper or fire exposed surfaces of the bars consist of plates,
cogs, or projections, which are formed of a suitable fire resisting material and are
easily removable from the bars and as easily replaced by new ones.
Several modifications of the cogs or projections as well as the methods of
attaching them to the bars are shewn in the accompanying drawings reference to
which is hereinafter made.
Figures 1 and 2 shew respectively in side elevation and cross section part of a
fire bar with my removable cogs or projections attached thereto.
Figure 3 illustrates in plan the fire bars shewn in Figures 1 and 2, the cogs.
however being removed.
Figures 4 and
represent in side elevation and cross section a different form of
fire bar and cogs which are inserted from above.
Figure 6 is a plan of this form of fire bar, one of the cogs being removed to shew
more clearly the method of attachment.
In Figures 7, 8, and 9, a still further modified form of fire bar is shewn in side.
elevation cross section and plan respectively. The two screws used for securing
the cogs in place may be substituted by a single screw as shewn by Figure 10.
In the construction illustrated by Figures 1, 2 and 3, the fire bar a is pivoted on
its upper side with a dovetailed longitudinal slot b which is closed at one end, and
into which the cogs c are fitted. The cogs are of any desired shape and are
furnished with dovetailed projections or feet d which fit within the longitudinal
slot. They are introduced into the slot at one end of the bar and are passed along
until stopped by the screw or rivet e at the other end. The cogs may either abut
against one another or may have intermediate pieces farranged between them as
illustrated. If desired each cog may be separately secured in place by a rivet
bolt or screw g. Any other sectional shape may be given to the longitudinal slot
which will prevent the cogs being vertically withdrawn.
As shewn in Figures 4, 5, and 6, the cogs are inserted from above into transverse
slots h. The slots are so shaped as to prevent lateral movement of the cogs c,
the shape preferred being that shewn in Figure 6 where the slot tapers from the
middle of its length on each side to its end. The cog feet i are similarly shaped
and after insertion are secured and held firmly in place by a bolt pin or screw g.
Upon any of the cogs which form the upper surface of the fire bar being burned
or damaged it is only necessary to remove the pins or screws g withdraw the
damaged cogs, and replace them by new ones.
In the form shewn in Figures 7, 8, and 9, the transverse slots K are dovetailed
in vertical longitudinal section and are wider at one side than the other. The
cog feet are also dovetailed and tapered and are inserted or withdrawn from one
side. Screws, bolts, pins, or rivets, g, prevent any movement of the cogs after they
have been secured.
By a slight modification, the two screws shewn holding each cog in place may be
substituted by a single screw as shewn in Figure 10. In this case the modified
dovetailed and tapered feet of the cogs are slotted as at n and corresponding

page_text: projections m are left in the transverse slots of the fire bar. Small openings are
left between the projections and the slots in which the screws or rivets g are
placed.
It is thus evident that the removable cogs cannot accidentally drop out, but
yet may be easily removed and replaced when desired, any part of the bar being
removed at will instead of the whole bar as is at present necessary..
A particular advantage in using the forms shewn in Figures 4 to 10 is that each
cog may be separately removed without reference to the others, but in the form
shewn in Figures 1 to 2, to remove and replace any one cog it would be necessary
to remove all the cogs between it and the free end of the longitudinal slot.
"
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is―
A fire bar the upper or fire exposed surface of which is furnished with suitably
shaped detachable cogs or projections secured and arranged substantially as
hereinbefore described and illustrated by the accompanying drawings and for the
purpose set forth.
Dated this 8th day of November AD 1809
+
WILLIAM E. HEYS,
Agent for the Applicant.