An Improved Induced Draught Apparatus for Furnaces.
Year: 1891

page_text: Date of Application, 27th Feb., 1891-Accepted, 18th Apr., 1891
COMPLETE SPECIFICATION.
An Improved Induced Draught Apparatus for Furnaces.
I, WILLIAM ARENA MARTIN, of 9, Pocock Street, Blackfriars Road,
Southwark, in the County of Surrey, Engineer, 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 consists in further improvements in my former inventions of "An
improved mode of developing and increasing the draught of furnaces" patented
5th August 1885 No. 9338 and "Improvements in friction gearing" patented 14th
December 1885, No. 15,316 and in the combination of the two said inventions.
By the application of the last named invention to the former the required speed
of fan can be obtained and maintained without the use of high speed engines and
with much greater certainty of action.
In order to avoid heating of bearings in such part or parts of the driving shaft of
the said induced draught apparatus as may be exposed to heat and to lessen and
reduce the friction, I use as a substitute for the ordinary plunmer blocks a pair
of rotary wheels fixed side by side in such a manner that their peripheries form a
loose running bearing in which the said driving shaft rotates.
Between the said friction gear and the adjacent plummer block or bearing I fix a
lever with an anti-friction wheel. By screwing down this lever the said anti-friction
wheel is made to impinge upon the aforesaid driving shaft and to depress the same
and the pinion or internal wheel of the said friction gear, thus relieving the said
plummer block or bearing of any strain or friction that might occur when working
at high speeds or from sudden variations of speed.
In order that my invention may be fully understood, I shall now proceed to
describe the drawings accompanying this Specification.
In these drawings Figure 1 is a sectional plan of my said improved induced
draught apparatus as applied to a funnel or chimney.
Figure 2 is a sectional elevation at a a Figure 1.
Figure 3 is an elevation at bb Figure 1 of the said pair of rotary wheels with
section of the said driving shaft.
A Figures 1 and 2 is the lever with anti-friction wheel B.
C. Figures 1 and 2 is a wheel attached to a screw by which the said lever and
anti-friction wheel can be depressed so as to impinge upon the said driving shaft
and prevent strain or friction on the plummer block or bearing D.
E. Figure 1 is the pair of rotary wheels aforementioned showing the manner in
which the same are used for carrying the said driving shaft.
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:-
1st. The combination of my two inventions aforementioned, Number 9338, 5th
August 1885 and Number 15,316, 14th December 1885 for the purpose of forming
an effective induced draught apparatus for assisting and accelerating the draught
of furnaces.
2nd. The use and application of the said rotary wheels as a substitute for plummer
blocks or bearings for the driving shaft of the said improved induced draught
annaratie

page_text: 3rd. The use and application of the said lever and anti-friction wheel in the
manner and for the purpose aforesaid.
Dated this 27th day of February 1891.
WILLIAM ARENA MARTIN.