Improvements in Spark Arresters for Smoke Stacks and Chimneys.
Year: 1899

page_text: Date of Application, 19th Sept., 1899
PROVISIONAL SPECIFICATION.
Improvements in Spark Arresters for Smoke Stacks and Chimneys.
We, STEPHEN SALSBURY MARTIN, Machinist and Millwright, and JOHN WESLEY
MARTIN, Sawyer and Millman, both of Evergreen, in the County of Jefferson and
State of Colorado, United States of America, do hereby declare the nature of this
invention to be as follows:-
The object of our invention is to provide a spark arrester, collector and director,
complete within itself and so constructed that it may be readily attached to the
top of any smoke stack, pipe, flue or chimney, and whereby the arresting, col-
lecting and directing screen, kept constantly rotated by the natural or forced.
draft through the smoke pipe, will cause the sparks, cinders and escaping coal
to be conveyed to a receptacle, in which said products will settle and be con-
ducted back to the fire box or fire, or to any desired point below the device.
The apparatus consists of a device mounted to rotate adjacent to the smoke
outlet and supported by a tubular base of such shape as will adapt it to be fitted
over or into the smoke stack, chimney or flue, and provided with a funnel-shaped
casing forming a receiving chamber for the cinders, coal and sparks. The base
extends a slight distance within the bottom portion of the chamber and a con-
ducting pipe for the waste products of combustion is attached to the upper por-
tion of the base. Said conducting pipe is at an angle to a line drawn perpen-
dicularly through the centre of the device, and one side of the conducting flue
or pipe is made to rest against a wall of the chamber formed by the funnel casing.
The upper end of the conducting flue, however, where said flue engages with the
funnel casing, is carried vertically upward, so that the upper edge of the con-
ducting flue is parallel or practically so with the upper edge of the said
funnel casing. The conducting flue is secured to the funnel casing and a bracket
is located upon the inner inclined surface of the conducting flue. This bracket
comprises an upright section, a horizontal table section, the centre of which is at
the centre of the funnel casing, and wings that extend from the sides of the table
section and are arranged for attachment to the upper portion of the conducting
flue. To the table section of the bracket a vertical post is secured, the lower end
of the post being made tapering to form a cone, a cone also being provided at
the upper end of the post. A sleeve is loosely fitted around the post and said
sleeve is provided at its lower end with a cap facing the lower cone of said post,
and said cap carries balls that travel on said cone, while a second cap is formed
at the upper end of the sleeve, likewise carrying balls that travel upon the upper
cone. The sleeve is provided at the top with a cap that extends over the upper
end of the post and the upper cone and carries a sleeve of such dimensions that
it entirely covers the upper end of the conducting flue and extends quite close
to the upper portion of the funnel-shaped casing. The screen is provided with a
downwardly extending marginal flange and braces are attached to said flange and
to projections from the cap. The said screen is provided with a series of wings
or fans upon its upper surface, extending from its periphery to a point near

page_text: the centre. The lower edges of the fans engage with the screen, and the fans
are curved and their inner faces are at an acute angle to the screen. Preferably
the upper edges of the fans or wings at their inner ends are more or less
bevelled. These fans are all curved in the same direction and are so placed that
as they reach the conducting flue the natural or forced draft from the said flue
will strike said fans or wings, and thus keep the screen constantly revolving.
The blades, wings or fans may be stationary but preferably they are adjustable,
having bolts and nuts or set screws at their outer ends, which will hold them
firmly in place when adjusted at the right angle to impart to the screen the
desired speed or number of revolutions in a given time. The speed of the screen
may be increased or diminished by placing the wings or fans in more or less of a
flattened or horizontal position, or in a more or less upright position.
A tube enters the chamber of the device at or near the bottom, and this tube
is carried downward to any desired point below the device; as, for example, it
may be carried to the fire box or to the fire direct.
The application of the natural draft or forced draft caused by the exhaust steam
from the engine entering the smoke stack, pipe, flue or chimney, serves as a
motor for the device and as the screen revolves it carries the cinders or other
waste products of combustion from the top of the stack to the surrounding
chamber, and as the screen carries the sparks or cinders beyond the influence of
the draft they naturally gravitate to the bottom of the chamber in which there
is practically no draft, and the arrested material then passes into a small pipe in
the bottom of the chamber and is conducted back to the fire, or to any other
desired point.
Instead of using ball bearings at the upper end of the post or shaft, said post
or shaft may be provided with a hardened steel pivot at that point.
Dated 1021.
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1000
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
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We, STEPHEN SALSBURY MARTIN, Machinist and Millwright, and JOHN WESLEY
MARTIN, Sawyer and Millman, both of Evergreen, in the County of Jefferson and
State of Colorado, United States of America, 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 object of our invention is to provide a spark arrester, collector and director,
complete within itself and so constructed that it may be readily attached to the
top of any smoke stack, pipe, flue or chimney, and whereby an arresting collect-
ing and directing screen kept constantly rotated by the natural or forced draft
through the smoke pipe, will cause the sparks, cinders and escaping coal to be
conveyed to a receptacle, in which said products will settle and be conducted back
to the fire box or fire, or to any desired point below the device.
The invention consists in the novel construction and combination of the several
parts, as will be hereinafter fully set forth and pointed out in the claims.
Reference is to be had to the accompanying drawings forming a part of this
Specification, in which similar characters of reference indicate corresponding
parts in all the figures.
Figure 1 is a plan view of the improved device;
Figure 2 is a vertical section thereof: and

page_text: Figure 3 is a perspective view of a bracket used in the construction of the
device.
The base A is in the form of a pipe, and is given such shape that it may be
fitted over or into a smoke stack, chimney or flue, and a funnel-shaped casing B
is firmly secured to the upper portion of said base A, forming a receiving
chamber 10 for the cinders, coal and sparks. The base A extends a slight dis-
tance within the bottom portion of the chamber 10, and a conducting pipe for
the waste products of combustion is attached to the upper portion of the base A.
Said conducting pipe 11 is at an angle to a line drawn perpendicularly through
the centre of the device, and one side of the conducting flue or pipe 11 is made
to rest against a wall of the chamber 10 formed by the funnel casing B. The
upper end 11 of the conducting flue, however, where said flue engages with the
funnel casing, is carried vertically upward, so that the upper edge of the con-
ducting flue 11 is parallel or practically so with the upper edge of the said funnel
casing, as shown in Figure 2. The conducting flue is secured to the funnel.
casing by means of bolts or rivets 12, or their equivalents, and a bracket is located
upon the inner inclined surface of the conducting flue. This bracket comprises
an upright section 13, a horizontal table section 14, the centre of which is at
the centre of the funnel casing, and wings 15 (Figure 3) that extend from the
sides of the table section 14, and are arranged for attachment to the upper
portion of the conducting flue 11.
The reduced lower end of a post 16 is made to enter an opening, 17 in the
table section of the said bracket, and the post is fixed to the bracket by means
of a suitable nut 18, as illustrated in Figure 2. The lower end of the post is
made tapering to form a cone 19, and a cone 20 is also located at the upper end
of the post 16. A sleeve 21 is loosely fitted around the post 16, which sleeve is
provided at its lower end with a cap facing the lower cone 19 of said post, and
said cap carries balls 22 that travel on said cone 19, while a second cap is formed
at the upper end of the sleeve, likewise carrying balls 22 that travel upon the
upper cone 20, as shown in Figure 2. The sleeve 21 is provided at the top with a
cap 23, that extends over the upper end of the post 16 and the upper cone 20.
A screen C is secured in any suitable or approved manner to the bottom of the
sleeve 21, and while this screen is shown as inclining from its outer edge toward
the centre it may be made straight if desired. Said screen is of such dimen-
sions that it entirely covers the upper end of the conducting flue 11, and extends
quite close to the upper portion of the funnel-shaped casing B. The screen C is
provided with a downwardly extending marginal flange 24, and braces 25 are
attached to said flange and to projections from the cap 23. The said screen is
provided with a series of wings or fans 26 upon its upper surface, extending
from its periphery to a point near the centre. The lower edges of the fans
engage with the screen, and the fans are curved and their inner faces are at an
acute angle to the screen. Preferably the upper edges of the fans or wings at
their inner ends are more or less beveled. These fans are all curved in the same
direction and are so placed that as they reach the conducting flue 11 the natural
or forced draft from the said flue will strike said fans or wings, and thus keep
the screen constantly revolving.
The blades, wings or fans 26 may be stationary, but preferably they are
adjustable, having bolts and nuts or set screws at their outer ends, which will hold
them firmly in place when adjusted at the right angle to impart to the screen
the desired speed or number of revolutions in a given time. The speed of the
screen may be increased or diminished by placing the wings or ians in more or
less of a flattened or horizontal position, or in a more or less upright position.
A tube 27 enters the chamber 10 of the device at or near the bottom, and this
tube is carried downward to any desired point below the device; as, for example,
it may be carried to the fire box or to the fire direct.
It will be observed that the application of the natural draft, or forced draft

page_text: caused by the exhaust steam from the engine entering the smoke stack, pipe,
flue or chimney, serves as a motor for the device.
As the screen revolves it carries the cinders or other waste products of com-
bustion from the top of the stack to the surrounding chamber 10, and as the
screen carries the sparks or cinders beyond the influence of the draft they
naturally gravitate to the bottom of the chamber 10, in which there is practically
no draft, and the arrested material will then pass into the small pipe 27 in the
bottom of the chamber 10, and will be conducted back to the fire, or to any
other desired point. The pipe 27 is preferably made continuous from the cham-
ber 10 to the point where the material is to be delivered.
It is to be understood that instead of using ball bearings at the upper end of
the post or shaft 16, said post or shaft may be provided with a hardened steel
pivot at that point.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
-
1. A rotary spark arresting device arranged to be operated by the natural or
forced draft of the stack, flue or chimney to which said device is applied.
2. A spark arrester mounted to rotate adjacent to the smoke outlet or flue
which it is to control and arranged to have a portion of its surface cut across.
the outlet or flue to intercept cinders and the like and in its rotation carry them
beyond the flue.
3. In connection with a smoke outlet or flue and a receiving chamber for
cinders, sparks etc., a spark arrester mounted to rotate and to intercept in its
rotation cinders and the like passing from the flue and carry the same to the
said chamber.
4. The propeller blades mounted directly on the rotary spark arresting screen
so as to be acted upon by the forced or natural draft for propelling the screen.
Dated this 8th day of June 1900.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.