Improvements in and connected with Furnace Firebars.
Year: 1893

page_text: Date of Application, 4th Nov., 1893-Accepted, 23rd. Dec., 1893
COMPLETE SPECIFICATION (AMENDED).
Improvements in and connected with Furnace Firebars.
THOMAS WOODWARD 83 York Street Nottingham Engine Driver 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 hollow perforated steam jet furnace fire bar apparatus consists of a series of
two bars, the front one is fitted into the back one and of a brass tube with small jets
screwed into it.
in. deep.
The front bar (Fig. 1) is 4 feet long 14.in. wide and 6
It has female
end F, and male end E. The front end is 9 in. long 1 in. wide across the middle
of the bell mouth G and 2 in. deep. The back end E is 14 in. long 2 in. deep and
1 in. wide. It fits into the she end H of the back bar. It has a passage A 1 in.
deep and in. wide running straight through it. From this passage to the outsides
of the bar run taper slots B. B. They are 1 in. long by in. wide at the top of
the passage and in. long and in. wide on the outsides of the bar.
There are
10 slots on the right hand side and 11 slots on the left hand side of the bar, they
are 3 in. from centre to centre and run alternately to each other. The web D is
3 in. deep in the middle, 1½ in. deep at the ends and tapers from ½ in. to in.
C. C. are facings standing proud in. of an inch.
The back bar (Fig. 2) is 3 ft. 4g in. long 1 in. wide and 6 in. deep. It has one
she end H and one end I cast solid.
The front end H is 2 in. deep 1 in. wide and runs 1g in. into the bar. The
back end I is cast solid for 28 in. into the bar. It has a passage A 1 in. deep
and in. wide running within 23 in. of the back end I. From this passage to the
outsides of the bar run taper slots B B they are 1 in. long by in. wide at the top
of the passage and in. long by an in. wide on the outsides of the bar.
There are 11 slots on the right hand side and 10 slots on the left hand side of the
bar. They are 34 in. from centre to centre and run alternately to each other. The
web D is 3 in. deep in the middle, 1 in. deep at the ends and tapers from
in. to in. C. C. are facings standing proud in. of an inch.
The steam jet (Fig. 8) consists of a brass tube K 33 in. long with brackets M
cast on it at each end and 20 small jets Lin. long screwed into it. It has a brass
nut screwed into one end and a in. steam pipe in at the other end.
Fig. 3, is the front end of the front bar. A is the passage G G is the bell
n.outh. C. C. C. C. are facings. D is the web and J is a groove running along the
face of the bar.
Fig. 4, is the back end of the front bar A is the passage E. E. the male end.
C. C. C. C. are facings D is the web and J is a groove running along the face of
the hor

page_text: Fig. 5, is a section of both back and front bars across the middle A is the
passage B B are the slots D is the web and J is a groove running along the face of
the bar.
Fig. 6, is the front end of the back bar A is the passage. H. H. is the recess.
C. C. are facings D is the web and J is a groove running along the face of the bar.
Fig. 7, is the back end of the back bar I is solid metal. C. C. C. C. are
facings. D is the web J is a groove running along the face of the bar.
Fig. 9, is the end view of the brass tube K showing the jet L, M is the bracket
with which the tube is fastened to the boiler.
Fig. 10, is the front view of a Cornish boiler with the bars and jets fixed
QQQ are the bars, K is the tube with the jets, N is the steam pipe, O is the
brass nut, M the brackets and, P¹ is a false dead plate cast on to the dead plate
proper on which the front male female end F of the front bar rests.
Fig. 11, is the side sectional view of a Cornish boiler showing the bars and jets at
work, N is the steam pipe, K is the brass tube, M the bracket, L the jet, P dead
plate proper, P1 false dead plate, Q the front bar, R the back bar, S the middle
bearer, T the bridge, and, U the flame. The arrows indicate the draught.
The front bar (Fig. 1) and the back bar (Fig. 2) are connected by the male
end E going into the she end H. The drawings of the bars and jets are full size
for a 6 foot furnace.
The bars and jets are to be made larger or smaller to suit requirements.
When the steam jets L are at work the steam forces air into the bell mouths G
along the passages A and then through the slots B. B. which causes a bright
flame.
The cool air from the stoke room which is forced through the bars helps to keep
the bars cool while in turn the air gets warm and supplies extra oxygen to the fire
without robbing the grate of any air that it ought to have in the ordinary way.
The advantage of this bar is that it can be worked with the natural and forced
draughts combined or with the natural draught alone in the ordinary way. The
fireman can regulate the forced draught by a valve on the steam pipe N (Fig. 10).
The steam pipe N which is connected to the boiler supplies the jets with steam.
The brass tube K is made so as to have the steam pipe N at either end to suit
convenience, the brass nut O is to fill the other end up. The bar apparatus is for
raising steam quickly and for burning inferior fuels.
They It can be used in Cornish, Lancashire, marine, stationary, locomotive type,
vertical and water tube boilers.
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
4st. The hollow perforated steam jet furnace fire bar apparatus substantially
2nd: The as hereinbefore described capable of use for the working of a natural and
forced draught combined the
3rd. The forced draught being caused by the steam jets blowing into and through
the bars.
Dated this 3rd day of November 1802
THOMAS WOODWARD.