IMPROVEMENTS IN HOT BLAST STOVES
Year: 1882

page_text: "
LETTERS PATENT to Edward Alfred Cowper of No 6 Great George Street
in the County of Middlesex for an invention of IMPROVEMENTS IN HOT
BLAST STOVES"
PROVISIONAL SPECIFICATION left by the said Edward Alfred Cowper at
the Office of the Commissioners of Patents on the 20th May 1882.
EDWARD ALFRED COWPER of No 6 Great George Street in the County of
Middlesex "IMPROVEMENTS IN HOT BLAST STOVES"
In Regenerative Fire Brick Hot Blast Stoves for heating the air for Blast
Furnaces such as are known as "Cowper Stoves," weighted brushes have sometimes
been used for cleaning out any dust that might be deposited on the sides of the
passages, as described in the Specification of a Patent granted to Charles William
Siemens, Edward Alfred Cowper and Charles Cochrane on January 5th 1870
No 34, such weighted brushes being worked up and down by chains, worked by
hand by a man inside the stove, after it had been cooled down sufficiently, to
allow of the man going in, and doors at the sides of the stove near the top have
been used for the purpose of admitting cleaning appliances to be used to free the
passages of dust. My present invention relates to means whereby the brushes
can be worked through the doors, by men on the ground outside of the stove.
For this purpose the chain carrying the weighted brush passes over a pulley fixed
at the end of a tube or bar and then passes horizontally through the door and
over another external pulley down to the ground, and has a balance weight
attached to it, a second pulley fixed on the spindle of the external pulley is pro-
vided with a second chain, which may conveniently be an endless chain reaching
down to the ground, so that the men on the ground may pull this chain up and
down and so work the brush-chain and brush up and down any passage it may be
brought over, the pulleys have projections to prevent slipping of the chain. The
tube or bar through which, or along which, the brush chain passes, is mounted in
a socket, so that it may be slid in or out, to reach the various passages, the socket
itself being provided with trunnions so that it may be angled about to allow the
brush to reach the various passages. The construction of the apparatus will be
more clearly understood by reference to the accompanying drawings.
Fig. 1 is a side elevation, Fig. 2 an end elevation, and Fig. 3 a plan.

page_text: A is a weighted brush attached to one end of the chain B which passes over the
pulley E fixed at the end of the tube D. The chain B passes from the pulley E
in a nearly horizontal direction to the chain pulley E¹ from which it hangs down
outside the stove, having suspended at its outer end a balance weight C. On the
same spindle with the pulley E' which has in its groove projections to gear into
the chain B, is keyed a similar pulley G, over which passes the endless chain F,
which may reach down to the ground. Thus a man standing on the ground outside
the stove, by pulling the chain F can cause the pulley E¹ to rotate in one direction
or the other, which by driving the chain B causes the weighted brush A to pass
up or down any passage in the stove over which it is brought by directing the
tube D. The tube D is mounted in a socket H in which it is capable of sliding
longitudinally to reach passages at various distances from the door. The socket H
is itself mounted on trunnions in the oval ring I with freedom to swing horizontally
through an arc of a circle, in order to reach passages in various positions on either
side of the door. Thus a very large number of passages can be reached from one
door by a single apparatus, and there being several doors, the whole of the passages
can be reached from one or other of the doors.
To facilitate the longitudinal movement of the tube D in the socket H, a
pinion J is provided the teeth of which take into holes in the tube D. The
pinion J is keyed upon a spindle K mounted in bearings formed by lugs on the
socket H, and each end of the spindle K being made to receive a loose winch
handle M. The tube D has a slot on its underside throughout the whole or
nearly the whole of its length, to enable the pulley E' mounted on the socket H
to project up into it, to receive the chain whether the tube is extended a short or
a long distance within the stove.
To lock the tube in any position in the socket, a bolt N is provided, passing
through a hole in the socket, and the slot in the tube, having a large head shaped
to fit the inside of the tube, and a nut O provided with a lever or handle for
turning it, on the outside. The oval ring I is provided with two bars or arms I I²
turning in sockets L L attached to the door frame, so that the whole may be
swung back for greater facility in mounting and dismounting the apparatus.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Edward Alfred Cowper in the Great Seal Patent Office on the
17th November 1882.
EDWARD ALFRED COWPER of No: 6 Great George Street in the County of
Middlesex IMPROVEMENTS IN HOT BLAST STOVES
In Regenerative Fire brick hot Blast Stoves for heating the air for blast
Furnaces, such as are known as." Cowper Stoves," weighted brushes have some-
times been used for cleaning out any dust that might be deposited on the sides of
the passages, as described in the Specification of a patent granted to Charles
William Siemens, Edward Alfred Cowper and Charles Cochrane on the fifth day
of January 1870 No 34, such weighted brushes being worked up and down by
chains, worked by hand by a man inside the stove, after it had been cooled down
sufficiently to allow of the man going in, and doors at the sides of the stove near
the top have been used for the purpose of admitting cleansing appliances to be
used to free the passages of dust. My present invention relates to means whereby
the brushes can be worked through the doors, by men on the ground outside of
the stove. For this purpose the chain carrying the weighted brush passes over a
pulley fixed at the end of a tube or bar and then passes horizontally through the
door and over another external pulley down to the ground, and has a balance
weight attached to it. A second pulley fixed on the spindle of the external
pulley, is provided with a second chain, which may conveniently be an endless
chain reaching down to the ground, so that men on the ground may pull this chain
up and down and so work the brush chain and brush up and down any passage it
may be brought over. The pulleys have projections to prevent slipping of the
chain
The tube or bar through which, or along which the brush chain passes, is mounted
in a socket, so that it may be slid in or out, to reach the various passages, the
socket itself being provided with trunnions so that it may be angled about to
allow the brush to reach the various passages. The construction of the apparatus
will be more clearly understood by reference to the accompanying drawings.
Fig: 1 is a side elevation partly in section, Fig. 2 an end elevation, and Fig: 3
a plan partly in section
A is a weighted brush attached to one end of the chain B which passes over
the pulley E fixed at the end of the tube D. The chain B passes from the pulley E
in a nearly horizontal direction to the chain pulley E' from which it hangs down
outside the stove, having suspended at its outer end a balance weight C. On the
same spindle with the pulley E' which has in its groove projections to gear into
the chain B, is keyed a similar pulley G over which passes the endless chain F,
which may reach down to the ground
Thus a man standing on the ground outside the stove, by pulling the chain F
can cause the pulley E¹ to rotate in one direction or the other, which by driving
the chain B causes the weighted brush A to pass up or down any passage in the
stove over which it is brought by directing the tube D. The tube D is mounted
in a socket H in which it is capable of sliding longitudinally to reach passages at
various distances from the door. The socket H is itself mounted in trunnions in
the oval ring I with freedom to swing horizontally through an arc of a circle, in
order to reach passages in various positions on either side of the door. Thus a
very large number of passages can be reached from one door by a single apparatus;
and there being several doors, the whole of the passages can be reached from one
or other of the doors.

page_text: To facilitate the longitudinal movement of the tube D in the socket H, a
pinion J is provided the teeth of which take into holes in the tube D. The
pinion J is keyed upon a spindle K mounted in bearings formed by lugs on the
socket H, each end of the spindle K being made to receive a loose winch handle M.
The tube D has a slot on its underside throughout the whole or nearly the whole
of its length, to enable the pulley E¹ mounted on the socket H to project up into
it, to receive the chain whether the tube is extended a short or a long distance
within the stove
To lock the tube in any position in the socket, a bolt N is provided passing
through a hole in the socket, and the slot in the tube having a large head shaped
to fit the inside of the tube, and a nut O provided with a lever or handle for
turning it on the outside. The oval ring I is provided with two bars or arms I¹ I³
turning in sockets L L' attached to the door frame so that the whole may be
swung back for greater facility in mounting and dismounting the apparatus
Having thus described the nature of my invention and in what manner the
same is to be performed, I hereby declare that I make no general claim to the
use of weighted brushes for cleaning the passages of hot blast stoves but, I
claim :-
For cleaning the passages of regenerative hot blast stoves, the use of apparatus.
provided with means of adjusting the angular direction of the cleaning brush
and its distance from the door on the side of the stove, and with means of working
the brush from outside the stove substantially as herein described.
In Witness whereof I the said Edward Alfred Cowper have hereunto set
my hand and seal this sixteenth day of November in the year of our Lord,
One thousand Eight hundred and Eighty two