Improved Arrangements for Preventing Smoke in Steam Boiler and other Furnaces.
Year: 1891

page_text: Date of Application, 13th Feb., 1891
Complete Specification Left, 27th Oct., 1891-Accepted, 12th Dec., 1891
PROVISIONAL DI EULTIVATION.
Improved Arrangements for Preventing Smoke in Steam Boiler and
other Furnaces.
JOHN TWEEDALE, No. 23 Turner Street, Waterhead Oldham Lancashire
JOSEPH TWEEDALE, Engineer No. 11 Culvert Street, Waterhead Oldham
Lancashire do hereby declare the nature of this invention to be as follows:-
-
This invention relates to a novel contrivance for the admission of a stream of
air, immediately in front of the burning fuel, in a steam boiler, or other similar
furnace.
In order to carry out this object the ordinary dead plate is dispensed with,
and a grid or slotted plate is substituted in its place.
This
Underneath this plate is another plate, so formed as to close any passage of air,
through the before mentioned upper plate, when it is required to do so.
underplate can be worked by hand, or other suitable means.
JOHN NUTTALL.
COMPLETE SPECIFICATION.
Improved Arrangements for Preventing Smoke in Steam Boiler and
other Furnaces.
JOHN TWEEDALE No. 23 Turner Street Waterhead Oldham Lancashire
JOSEPH TWEEDALE No. 11 Culvert Street Waterhead Oldham Lancashire,
Engine Drivers 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 a novel contrivance for the admission of a stream of
air immediately in front of the burning fuel in a steam boiler or other similar
furnace. In order to carry out this object the ordinary dead plate is dispensed
with, and a grid or slotted plate A Figs. 1 and 2 is substituted in its place.
Underneath this plate is another plate B. When the upper plate A is of the grid
form, the plate B is made with corresponding slots or openings through it as shown
in Fig. 4 and it may be worked in various ways, so as to open or close the air
passages in the plates A and B. In Figs. 1 and 2 it is shown to slide on the pro-
jections C and C 1 on the plate A. The plate B is connected to a lever E that
swings on the stud D. The lever E extends to the front of the boiler and may be
worked by hand or may be worked from the furnace door K so as to open the
beforementioned air passages in the plates A and B each time the fire requires
fresh fuel. One arrangement is shown in Figs. 2 and 3 which consists of an air
cylinder G in which there is a piston. This piston is connected by means of a rod
or spindle F to the lever E. When the furnace door is opened it comes in contact
with the stud H on the lever E and moves the piston in the cylinder G, so as to
compress a volume of air in the cylinder G. When the furnace door is closed it
leaves the stud H and the compressed air in the cylinder G then slowly forces the
piston back. And thereby closes the air passages in the plates A and B. The
time in closing the air passages in the plates A and B is regulated to the require-
ments of the furnace by means of a small tap or valve that governs the amount of
compressed air in the cylinder G by being more or less open.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is
The arrangement of a grid or slotted plate A (in place of the dead plate), in
combination with a moveable plate or grid B, substantially as illustrated and
described.
och dess of October 1891
JOHN NUTTALL,
Agent for Applicants.