Improved Means of Preventing Incrustation of Certain Parts of Steam Boilers.
Year: 1886

page_text: PROVISIONAL SPECIFICATION.
Improved Means of Preventing Incrustation of Certain Parts of
Steam Boilers.
I, SAMSON Fox, of the Leeds Forge, New Wortley, Leeds, in the County of
York, Engineer and Ironmaster do hereby declare the nature of this invention to
be as follows:-.
Certain interior parts, such as the submerged portions of fire-boxes and flues of
steam boilers generally and especially of marine boilers, are liable to become coated
with sediment that ultimately becomes hardened into scale or incrustation, which
considerably interferes with the evaporative efficiency of the boilers. Now
this invention has for object to prevent the formation of scale or incrustation by
removal of sediment whilst still in a soft state. For this purpose, scrapers of suitable
form depending upon the shape of the fire box or flue (which may be of the kind
well known as Fox's Patent corrugated flues) are arranged upon and so as to bear
against the surfaces upon which accumulation of sediment is to be prevented.
These scrapers are connected by suitable means such as chains with weights
attached thereto. The scrapers have imparted to them a to and fro motion by
hand or otherwise through chains and rods and windlasses or other suitable
mechanism.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improved Means of Preventing Incrustation of Certain Parts of
Steam Boilers.
I, SAMSON Fox, of the Leeds Forge, New Wortley, Leeds, in the County of
York, Engineer and Ironmaster, 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 :-
Certain interior parts such as the submerged portions of fire-boxes and flues of
steam boilers generally, and especially of marine boilers, are liable to become
coated with sediment that ultimately becomes hardened into scale or incrustation,
which considerably interferes with the evaporative efficiency of the boilers.
Now this invention has for object to prevent the formation of scale or incrus-
tation by removal of sediment whilst still in a soft state. For this purpose scrapers
of suitable form depending upon the shape of the fire-box or flue (which may be
plain or of the kind known as Fox's Patent corrugated flues) are arranged upon
and so as to bear against the surfaces upon which accumulation of sediment is to
be prevented.
These scrapers are connected by suitable means such as chains with weights
attached thereto.
The scrapers have imparted to them a to and fro motion by hand or otherwise
through chains and rods and windlasses or other suitable mechanism.
In the annexed drawings, Fig. 1, is a longitudinal sectional view of parts of a
marine steam boiler, the outer shell a, and portions of the fire boxes c, and d,
being in section, and the remaining portions being in elevation with the scrapers
thereon. Fig. 2, is a transverse section with portions e, e, at cach side in end
elevation. The fire boxes shewn are of the Foxs corrugated type, f, f, are the
scrapers, the edges f¹, f¹, of which are formed to fit the corrugations.-The scrapers
on each respective tube or fire-box are connected by links g, g, and are caused to
press against the upper surface of the fire box by weights, such weights are shown
at h, h, and i, i.
The series of scrapers on tube b, and those on tube d, are connected so those on
tube c, by the chains j, j. Thus the weights i, i, have double duty to perform,
therefore they are twice as heavy as the weights h, h.-k, k, are windlasses for
actuating the scrapers.-On the main shaft of each windlass are chain pulleys
1, 1, 1 &c (in the example illustrated there is one to each transverse row of scrapers
on the tubes b and d, respectively) which may be as represented in the form of
sheaves for the reception of the chains m, each of which is at one end attached to
one of the pulleys 1, and at the other end is attached to one of the rows of scrapers
on the side tubes b, and d.
The windlasses are arranged for being actuated alternately as may be deemed
necessary to impart to and fro motion to the scrapers, the chains m, of one
windlass being slackened before the windlass on the contrary side is made to draw
the scrapers towards it.
These operations are reversed for the return movement of the scrapers. The
movement of the windlasses is so arranged that the travel of the scrapers shall be

page_text: such that their respective to and fro movements upon the tubes will somewhat
exceed the relative distances between each longitudinal series thereof, and thus all
such parts of the tubes upon which they act will be scraped; stops n, n¹ are
provided for determining the circumferential movement of the scrapers.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. As means of preventing incrustation upon submerged portions of the fire
boxes and flues of steam boilers, a series of scrapers of suitable form depending
upon the shape of the surface to which they are applied, such scrapers being
connected and weighted in such a way that they can be caused to move to and fro
upon (that is to say alternately towards each side of) the fire box and flue to
which they are applied substantially as described for the purpose specified.
2. In a steam boiler having two or more fire boxes and flues, each provided with
apparatus such as referred to in the preceding claim, connecting the scrapers of
one fire box or flue with those of another fire box or flue or of other fire boxes or
flues, substantially as described for the purpose specified.
3. As means for preventing incrustation upon submerged portions of fire boxes
and flues of steam boilers, apparatus constructed, applied and operated substantially
as described and shown in the drawings annexed.