Year: 1886

page_text: Date of Application, 8th Mar., 1886.
Complete Left, 2nd Dec., 1886.
Complete Accepted, 14th Jan., 1887.
I, JAMES YATE JOHNSON, of 47 Lincolns Inn Fields in the County of Middlesex,
Gentleman, do hereby declare the nature of this invention to be as follows:-
This invention relates to spark-arresters or apparatuses for preventing the ejection
of sparks and soot from chimneys of all kinds, and it substantially consists in improved
means for separating out the sparks, &c., from the ascending current of combustion-
gases by centrifugal action and the operation of deflecting surfaces, and causing them
to be thrown into a collecting-chamber.
For this purpose a number of strips of sheet metal forming spirals, are so arranged
lengthwise in a tube constituting a portion or a prolongation of the chimney, that their
outer edges are in proximity to the walls of the tube, while a free central space is left
between them, and that their upper ends project from the tube. The said tube is
surrounded by a casing extending above the spirals and having an annular cover with
an opening of the size of the free area of the chimney. At the bottom this casing is
closed. The upper ends of the spirals are so twisted or bent as to deflect the sparks
outward, and centrally between these ends is arranged for the same purpose a deffector
having preferably the form of an inverted cone. Inside of the system of spirals may
be fixed rings or short tubes, especially in case the draught of the chimney is increased
by a blast-pipe, in view of confining the jet of steam or the main current of the
combustion gases to the central space between the spirals. The tube within which the
spirals are placed, is preferably made somewhat wider than the chimney so that its area
minus the sectional area of the spirals and the said rings may be equal to the area of
the chimney.
By means of this apparatus the sparks, being conducted in spiral lines, are caused
to assume circular motion whereby they are impelled outward, so that on arriving at the
end of the said tube, and being at this point of their course moreover directed outward
by the upper ends of the spirals and the deflector, they will fly into the collecting
chamber, whence they may be extracted through a door.

page_text: I, JAMES YATE JOHNSON, of 47 Lincoln's Inn Fields, Middlesex, do hereby declare
the nature. of this invention, and in what manner the same is to be performed, as
communicated to me from abroad by Ernst Werner of Hamburg, Germany, Engineer,
to be particularly described and ascertained in and by the following statement :-
This invention relates to spark-arresters, or apparatuses for preventing the ejection
of sparks and soot from chimneys, and it substantially consists in improved means for
separating out the sparks, &c., from the ascending current of combustion-gases by
centrifugal action and by deflexion from the current, and for causing them to be thrown
into a collecting-chamber.
On the annexed sheet of drawings a chimney provided with the improved apparatus
is shown by Fig. 1 in sectional elevation and by Fig. 2 in plan.
In the tube N constituting a portion or a prolongation of the chimney U are arranged
lengthwise a number of strips or plates S of sheet-metal forming spiral or helical
surfaces, the said strips or plates closing with their outer edges against the walls of.
the tube N, while a free central space is left between them, and their upper ends
project from the tube. The said tube N is surrounded by a casing M closed at the
bottom and extending with a wider portion above the plates S, and which has an
annular cover L, the aperture whereof is equal in area to that of the chimney. This
casing which may have the form shown in full lines in the drawing, or that of a cone,
as indicated by dotted lines, constitutes together with the walls of the tube N, a
chamber, P, for the sparks to collect in. The upper ends S¹ of the plates S are so
twisted or bent as to be inclined to the corresponding radial planes of the chimney,
and to deflect the sparks outward. Between the ends S¹ is arranged for the same
purpose a deflector T having preferably the shape of an inverted cone. By means of
rings or short tubes R, fastened to the inner edge of the plates S, these are connected
together so as to form a single piece, which may be removed from the chimney if
required. In case the draught of the chimney is increased by a blast-pipe, the said
rings or tubes also serve to confine the jet of steam to the central space between the
plates S. The tube N in which the plates are placed, is preferably made somewhat
wider than the chimney, so that its area minus the sectional area of the plates and the
rings R is about equal to the area of the chimney.
By means of the described apparatus the sparks, being conducted in helical lines,
are caused to assume circular motion, whereby they impelled outward or towards the
walls of the tube N, so that on arriving at the end of the said tube, and being moreover
at this point of their course directed outward by the upper ends of the plates S and
the deflector T, they will fly into the collecting-chamber P, whence they may be
removed through a door O.

page_text: Having now particularly described and ascertained the nature of the said invention,
and.in what manner the same is to be performed, as communicated to me by my
correspondent, I hereby declare that what I claim is :
In a spark-arrester, the combination, with the tube N forming a portion or a pro-
longaton of the chimney U, of the spiral or helical plates S, whose upper ends are
inclined to the radial planes of the chimney, so as to deflect the sparks outward, the
rings R fixed to and connecting together the plates S, the deflector T at the upper end
of the said plates, and a collecting chamber P surrounding the tube N, substantially as
and for the purpose specified.