Improved Construction of Apparatus for Scraping the Water Sides of Tubes, Tube Plates, and Combustion Chambers of Steam Boilers.
Year: 1892

page_text: Date of Application, 2nd Dec., 1892
Complete Specification Left, 27th Mar., 1893—Accepted, 13th May, 1893
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PROVISIONAL SPECIFICATION.
Improved Construction of Apparatus for Scraping the Water Sides
of Tubes, Tube Plates, and Combustion Chambers of Steam
Boilers.
I, RALPH JOHN SMITH, of Pier Engine Works, South Dock; Sunderland,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for object, improved construction of apparatus for scraping
the water sides of tubes, tube plates, and combustion chambers of steam boilers.
For the purpose of my invention, I hang a plate from the tubes, and key it in
place; this plate has bearings for a threaded rod, on which is a block guided by
the plate, when moved to and fro by turning the threaded rod. The block has
fitted to it the necessary scraping blades, so that when it has a motion by the rod
removes the scale from the surface according to its shape and the number of tubes
it acts upon. :
Dated this 2nd day of December 1909
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Ralph John Smith.
COMPLETE SPECIFICATION.
Improved Construction of Apparatus for Scraping the Water Sides
of Tubes, Tube Plates, and Combustion Chambers of Steam
Boilers.
1, RALPH JOHN SMITH, of Pier Engine Works, South Dock, Sunderland,
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 has for object, improved construction of apparatus for scraping
the water sides of tubes, tube plates, and combustion chambers of steam boilers.
For the purpose of my invention, I hang a plate from the tubes, and key it in
place; this plate has bearings for a threaded rod, on which is a block guided by
the plate, when moved to and fro by turning the threaded rod. The block has
fitted to it the necessary blades, so that when it has a motion by the rod removes
the scale from the surface according to its shape and the number of tubes it acts
upon.
The method of applying my invention for the purpose is represented in the
annexed drawings.
Figure 1 is an elevation, Figure 2 a plan, and Figure 3 a front view of a scraper
with undulating cutting surface, but which may be plain and of any desired
width.
A is a plate of a length about equal to that of the tubes, or boiler plates to be
scraped and scaled. B, B, are hangers to straddle the end tubes C, C, said hangers
being fixable by the wedge keys D, D, by being entered into slots of the plate A,
as shown. E, E, are end strips fixed to the plate A, and these have lips F, F,
projecting from one edge to carry the threaded rod G on which the scraper
block H is mounted for motion to the right or left according to the direction in
which the handle I is turned by an attendant. The block H wholly encircles the
plate A but somewhat loosely, so that it can be readily moved along it. The
block carries the scraping or scaling blades J, J, which are within touch of
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page_text: the tubes they are intended to scrape, the calcareous, or other deposit being
removed and the tubes left clean. The scrapers act transversely on the tubes, and
it is not essential that the tubes be scraped in the direction of their length, because
the scale has a tendency to flake off from beyond the actual touch of the blades
during the scraping.
On the right hand side of Figure 1, I have shown the action of the scraper or
scrapers, the apparatus being shown as fitted for horizontal application.
The blades either for roughing or for plain scraping may be of any formation,
whether for boiler plate, or for tube scraping, for scaling the boiler plates, or of
the combustion chamber, the cutting, or scraping edges project from the ends of
the block H.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what
I claim is :-
1. The combination of scraping blades, movable block and motion screw in
connection with a plate capable of suspension from the tubes of a boiler for the
removal of calcareous deposit from the internal surfaces of such boiler as set forth,
and substantially as shown.
2. The construction of apparatus of the kind represented in the drawings for
scraping the water sides of tubes, tube plates, and the combustion chambers of
steam boilers in the manner described.
T
1
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Ralph John Smith.