An Improved Bonnet or Guard for Boiler Funnels.
Year: 1893

page_text: Date of Application, 24th Jan., 1893
Complete Specification Left, 24th Oct., 1893-Accepted, 24th Jan., 1894
PROVISIONAL SPECIFICATION.
An Improved Bonnet or Guard for Boiler Funnels.
I, ROBERT BIRTWISTLE trading as S. S. Stott & Co., of Laneside Foundry,
Haslingden, in the County of Lancaster, Engineer, do hereby declare the nature
of this invention to be as follows:-
My invention relates to an improved bonnet or guard for the funnels of steam
barges, portable engines, and the like, and the chief objects of my invention are to
prevent the escape of flames, cinders, sparks etc., from the mouths of such funnels.
I construct my improved bonnet of a circular or other form of metal framework
of larger diameter than the funnel, this frame is suspended upon brackets, which
project into the top of the funnel, or in other convenient manner; the upper
portion of the frame is conical and composed of plate iron or other metal which
encloses a cap or lining of fire resisting material; a portion of the vertical sides of
the frame is composed of open wire work or perforated sheet metal, and the lower
portion is of sheet metal which with a similar ring of metal surrounding the funnel
and a metal bottom forms an annular space to receive cinders etc. The bonnet
is preferably so fitted that it can be readily removed from the funnel when not
required.
When the bonnet is in position the flames which escape up the funnel come in
contact with the lining of fire resisting material while the cinders etc. striking
against the wire or open work fall back into the annular space from which they can
be emptied as required, a door may be provided for this purpose; the open wire or
equivalent portion of the bonnet allows the free escape of smoke.
Dated this 23rd day of January 1893,
H. B. BARLOW & GILLETT,
Agents for Applicant.
COMPLETE SPECIFICATION.
An Improved Bonnet or Guard for Boiler Funnels.
I, ROBERT BIRTWISTLE, trading as S. S. Stott and Co. of Laneside Foundry,
Haslingden, in the County of Lancaster, Engineer, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be par-
ticularly described and ascertained in and by the following statement :-
My invention relates to an improved bonnet or guard for the funnels of steam.
barges, portable, movable or stationary engines, and the like, and the chief objects
of my invention are to prevent the escape of flames, cinders, sparks etc., from the
mouths of such funnels.
And in order that my invention may be fully understood and readily carried
into effect I will describe the accompanying sheet of drawings reference being
had to the figures and letters marked thereon.
Figure 1 is an elevation and Fig. 2 a sectional elevation of a boiler funnel fitted
with my improved bonnet or guard.
Figure 3 is a similar view to Fig. 1 but illustrating an alternative mode of
securing the bonnet to the funnel.
In Figs. 1 and 2, a designates the boiler funnel and b the improved bonnet
which I construct as shown of a circular metal framework of larger diameter than the
funnel, or the framework may be of any convenient and suitable form other than
Price 8d 1

page_text: circular. The upper portion of the frame is conical and composed of plate iron or
other suitable metal, which incloses a cap or lining of fire resisting material c.
A portion of the vertical sides of the frame is composed of open wire work, wire
gauze or perforated sheet metal d, and the lower portion is of sheet metal which
with a similar ring of metal surrounding the funnel a and a metal bottom forms an
annular space to receive cinders etc.
The bonnet b may be secured to the funnel a in any convenient manner and is
preferably so fitted that it can be readily removed therefrom when not required.
In the arrangement Figs. 1 and 2 the bonnet 6 is shown suspended by a gallery
composed of a series of brackets e the arms e¹ of which project into and rest upon
the top of the funnel a and the bonnet 6 is secured in place by a series of
screws and lock nuts f, the screws pinching washer plates g which bear against the
funnel a.
In the alternative arrangement illustrated by Fig. 3 the frame of the bonnet b is
simply made to fit into and upon the top of the funnel a.
I have shown and described two modes of fixing the bonnet b to the funnel a but
I do not wish to limit myself to these as it is obvious that any other convenient
method may be adopted according to requirement and to the construction of the
funnel to which the bonnet is applied.
I can make the bonnet 6 adjustable vertically and relatively to the funnel, and
this also may be effected in a variety of ways, as for example, in Fig. 1, the arms e¹
may be bolted or otherwise secured in slots or holes in the brackets e, so that
their positions may be adjusted higher or lower, and the bonnet 6 may be corre-
spondingly raised or lowered as required.
When the bonnet is placed in position the flames which escape up the funnel
come in contact with the lining c of fire resisting material, while the cinders etc.,
striking against the openwork d, fall back into the annular space from which they
can be emptied as required, and to facilitate this operation a door h may be
provided in the side as shown or in the bottom of the framework or in the open
wire work. The wire work or equivalent open portion d of the bonnet while
catching and retaining the cinders etc., as described, allows the free escape of smoke
and heated gases.
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 :-
1. The combination with a boiler funnel, of a bonnet or guard composed of a
metal frame, the top portion of which has a cap or lining of fire resisting material,
a portion of the sides is composed of open wire work or perforated sheet metal, and
the lower portion is sheet metal all substantially as and for the purposes herein set
forth.
2. The combinations with a boiler funnel a, of a bonnet substantially as
and for the purposes herein described and as illustrated by the accompanying
drawings.
Dated this 23rd day of October 1893.
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicant.