Year: 1888

page_text: Date of Application, 17th May, 1888
Complete Specification Left, 8th Feb., 1889
Complete Specification Accepted, 9th Mar.. 1889
1 Sam Bamfort□ of 1 Pike's Lane Glossop in the County of Derby, Engineer
do hereby declare the nature of my said invention to be as follows:-
The object of this invention is to so manufacture a cast iron fire-bar that an
increased draught or air-space is provided with a less weight of metal than in fire-
bars as hitherto constructed.
In performing my invention instead of having the air spaces in straight parallel
directions on each side of the web or centre of the fire-bar as heretofore I employ a
fire-bar with a much thinner web and with corrugations or projections runuing the
entire length on each side thereof. These corrugations are wider on one side of
the fire-bar than the other so that when placed side by side with the narrow corru-
gations on one side fitting into the wider corrugations or corresponding recesses in
the adjoining fire-bars, air passages of corrugated form and of extended length are
obtained.
In this manner I secure a wider fire-surface for each fire-bar with considerably
less weight of metal.
I prefer that at regular intervals the length of one of the corrugations shall be
extended so as to be in touching contact with the next fire bar and thus not only
prevent the possibility of warping but to act as a guide for ensuring a regular and
parallel width of corrugated air passage being left between the fire-bars.
Dated this whith day of MLSSS
-
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester,
Agent for the Applicant.
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester,
Agent for the Applicant.

page_text: I SAM BAMFORTH of 1 Pikes Lane Glossop in the County of Derby, Manager,
do hereby declare the nature of my said invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement:-
This improved construction of fire bar consists of a cast iron bar having on each
side a series of projections or teeth giving to the said bar the appearance of a double
toothed rack.
On one side the teeth of my improved fire-bar are all of the same length whilst
on the other side each alternate tooth is slightly longer. When placed side by side
in a furnace these improved fire-bars so interlock with each other that a narrow
corrugated air space is left between the adjoining sides of each bar and thus a much
more extended area of opening for the admission of air to a furnace is afforded than
has hitherto been practicable.
On the accompanying drawing I illustrate in Fig. 1.,a side view and in Fig. 2. a
plan view of my improved fire-bar. In Fig. 3. I illustrate a set of these bars shewing
how the same interlock together and are placed in the furnace and in Fig. 4 I
illustrate a sectional plan view of part of a steam boiler shewing my improved fire
bars applied thereto.
In all the views a a are the improved fire-hars having on one side a set of teeth or
projections of equal length and on the other side a similar set of teeth or projections
but each alternate one of which (marked c) is longer than its neighbour on either
side. The object in so making the teeth of unequal length is that when placed
together interlockingly side by side in the furnace as seen more clearly in Fig. 3. the
longer teeth shall be in touching contact with the adjoining fire-bar and thus not only
do I obtain a corrugated air space between the shorter intermediate teeth or
projections but I effectually prevent the fire bars getting out of shape when heated.
At each side of the furnace where the fire-bars adjoin the walls of the fire place!
employ a fire bar having a plain side as illustrated by d (Fig. 3).
A reference to Fig. 1. will shew that the teeth or projections are not continued
to the bottom of the web e but that the latter is extended down as illustrated and
is capable of being made much lighter and thinner than heretofore.
It will be obvious that by means of my improved corrugated fire bars the slits
or openings for the admission of air are brought closer together and are capable
of being extended more over the entire area of the grate surface than is practicable
with straight fire-bars.
I wish it to be distinctly understood that I do not confine myself to the precise
form of teeth or projections upon the sides of my improved fire bars or to each
alternate tooth being longer on the one side as hereinbefore described and illustrated
on the accompanying drawing, as it will be obvious that the saune may be modified
without departing from the principle of my invention.

page_text: Having thus particularly described and ascertained the nature of this my said
invention and in what manner the same
J claim is:
to be performed I declare that what
-
The improved construction of fire bars having teeth or projections on either side
so arranged that when placed together side by side in a furnace such bars shall.
interlock and afford narrow corrugated openings for the admission of air in
combination with provision for keeping the bars in position when heated substantially
as herein before described and illustrated on the accompanying drawing.
Dated this 30th den of T
1000
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester,
Agent for the Applicant.
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester,
Agent for the Applicant.