Improvements in Steam Boiler and other Furnaces.
Year: 1895

page_text: Date of Application, 21st Oot., 1895
Complete Specification Left, 21st Aug., 1898-Accepted, 28th Sept., 1896
Improvements in Steam Boiler and other Furnaces.
We EDWARD BENNIS and ALFRED WILLIAM BENNIS all of Beech Hill Sharples
Bolton in the County of Lancastor do hereby declare the nature of this invention
to be as follows:-
This invention relates to furnaces for steam boilers and other structures; and to
supplying air thereto, and to. keeping bars comparatively cool however fierce the
fire; and to construction of fire bars on an improved plau, whereby the part
exposed to the fire can be easily renewed.
The bar consists preferably of a U. section of cast iron or other suitable motal;
the head of which is formed so that all the bars can be pushed into the fire
together, and drawn out one by one, by means of a cam, or other suitable
mechanism. Or the bar may rest on a lever or levers, which move it to and fro,
and up and down.
The top of the fire bar is formed by either small bars or gride, with narrow air
spaces or air holes, so that very little ash can fall through.
The front end of the fire bar is formed preferably with a trumpet shaped mouth.
The body of the bar forms an air chamber, and is preferably from 3 to 5 inches
wide, or thereabouts, and of a suitable depth.
Near the front end of the bar, I place the steam jet, which blows air into the bar
by the action of the steam, and creates in each bar a forced draught, which blows
up the fire in all parts through the narrow spaces of the grid or small fire bars,
which form the surface of the upper part of the firo bar.
This arrangement enables forced draught to be used without a closed stoke-hole,
and each part of the fire receives its due share of blast, so that the action is similar
to blowing up the fire with a bellows simultaneously in every part. The rush of
steam driven air through the bar, effectually prevents the bar from getting hot,
and in case by accident, any one of the grids or small bars are injured or destroyed,
they can be renewed at a trifling expense.
It is sometimes convenient to connect the bars to a fan or bellows, instead of
using a steam jot; though whenever suitablo we prefer the steam jet.
Dated this 21st day of October 1895.
COMPLETE SPECIFICATION.
Improvements in Steam Boiler and other Furnaces.
We, EDWARD BENNIS and ALFRED WILLIAM BENNIS all of Beech Hill,
Sharples, Bolton, in the County, of Lancaster, 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 furnaces for steam boilers, and other structures, and to
supplying air thereto, whereby the furnace bars are kept comparatively cool

page_text: however fierce the fire may be. It also relates to the general construction of fire
bars on an improved plan whereby the bars exposed to the fire can be easily
removed. The bar consists preferably of a U or V section of cast iron, or other
suitable material, the head of which is formed so that all the bars cau be pushed
into the fire together and drawn out one by one by means of a cam or other
suitable mechanism or the bar may rest on a lever, or levers, or rollers, and can be
made to move to and fro or up and down. Other arrangements for rocking the
bara van however be adoptail.
The invention is best described by aid of the accompanying drawings, in
The invention is best described by aid of the accompanying drawings, in
which,
Fig. 1, is a longitudinal section of a bar and its appurtenances.
Fig. 2, transverse section.
Fig. 3, plan of one of the grids.
The upper surface of the bar E is formed of grids or small separate bars carried
in offsets of the somewhat sloping edges of the main bar with narrow air apaces or
air holes through or between them so that very little ash cau fall through though
there is a large air space. The front end of the bar below the front pluto is
formed with a trumpet shaped mouth F. The body of the bar G forms an air
chamber or trough and is usually provided with a hole II at the bottom, temporarily
supplied with a cover, not shown, whereby any dirt that falls into the trough can
be scraped out at intervals or even blown out by the blast. The body of the fire
bar is preferably from three and a half to five inches wide or thereabouts, and about
the same in depth or a little deeper. In or near the trumpet mouth in front of the
bar and axial with it we place a steam jet 1, which blows air into the bar by the
action of steam and thus causes forced drauglit in the said bar which blows up
into the fire through the narrow spaces or grids or small fire bars which form the
surface of the upper part of the fire bar. The arrangemont enables forced draught
to be used without a closed stokehole and each part of the fire receives its due
share of blast so that the action is similar to blowing up the fire with a bellows
simultaneously in every part. The rush of steam driven air through the bar
effectually keeps the latter cool and provouts the clinker sticking to them. In
case by accident any part of the grid or small bars be injured or destroyed it can
be renewed at a trifling cost. A high pressure air jet can be used instead of a steam
jet. A, is a bearer carrying the bars B, a solid portion of the dead plate shown
with a hook C and projection D against which acts successively the cum K. This
cam can be replaced by other cams such as are well known which push each bar
in succession back to draw thom all forward at the same time or vice versu.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed wo declare that what
we claim is :-
1. The improvement in steam boilers and other furnaces, which consists in
forming a longitudinal bar into the front end of which air is blown directly by the
action of a steam jet compressed air or the like, and having orifices on its upper
part formed in movable grids whereby a system of forced draught can be used
without a closed stokehole, the bar is kept cool and the wearing surface can be
easily and cheaply renewed substantially as described.
n
2. A mechanically moved bar into which air is driven arranged and constructed
substantially as described and illustrated.
Dated the 90rk'dów äf ▲ 1900
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Patent Agents for the Applicants.