Improvements in Apparatus for Scraping the Outer Surfaces of Steam Boilers and the like.
Year: 1892

page_text: Date of Application, 20th May, 1892
Complete Specification Left, 18th Feb., 1893-Accepted, 25th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Scraping the Outer Surfaces of
Steam Boilers and the like.
We THOMAS ORMSTON at Messrs. Sorabjee Shapurjee & Company's Ironworks,
Khetwady, Bombay, India, Mechanical Engineer, and LOUIS RUSHWORTH of City
of Bombay Mills, Chinchpoogly, Bombay, India, Mill Manager, do hereby declare
the nature of this invention to be as follows:-
Our said invention relates to improved apparatus to be employed in boiler flues
for scraping away the soot deposited on the outside of the shell of the boiler. The
scrapers themselves are preferably square in cross section and have the corners of
the square grooved or channelled out in a concave form to form acute scraping
edges. In order that they may readily accommodate themselves to the contour of
the boiler they are made in short lengths and are threaded on a chain or similar
flexible or articulated carrier. A weight attached to one end causes the flexible
line of scrapers to bear with some force against the surface of the boiler.
In order that the scrapers may readily yield and pass over such obstacles to
their free passage as rivet heads or joints we provide pivoted compensating levers
and balance weights.
One or more of such flexible scrapers may be applied in each flue and they may
operate either in a longitudinal direction or concentrically with the shell of the
boiler.
The scrapers may be worked either intermittently by hand or continuously by'
power transmitted through chains rods or other convenient means. When operated
in a longitudinal direction the feet of the frames which carry the
and are guided by channelled guide rails.
Dated this 19th day of May 1892.
scrapers rest in
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Scraping the Outer Surfaces of
Steam Boilers and the like.
We THOMAS ORMSTON at Messrs. Sorabjee Shapurjee & Co.'s Ironworks,
Khetwady, Bombay, India, Mechanical Engineer, and LOUIS RUSHWORTH of
City of Bombay Mills Chinchpoogly, Bombay, India, Mill Manager, 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, and accompanying drawings:
:-
Our said invention relates to improved apparatus to be employed in boiler flues
for scraping away the soot deposited on the outside of the shell of the boiler.
In order that our said invention may be more clearly understood we will describe
the same with reference to the accompanying drawings which by way of example
illustrate its application to a Lancashire boiler premising that we in no wise limit
ourselves to the precise forms or relative sizes of the parts which may be varied to
suit special cases without departing from the essential feature of our said
invention.
In the said drawings
Fig. 1 is a side elevation showing at the left hand a partial section through
the bottom flue and at the right hand a partial section through one of the side flues.

page_text: Fig. 2 is a cross section through xx.
Fig. 3 is a front elevation showing the position of the pulleys carrying the chain
by which the scrapers are worked along the boiler.
Fig. 4 is a top view of the bracket K' with the scraper in its working position
against the surface of the boiler.
The scraper blocks shown separately in Figs. 5 and 6 are preferably square in
cross section with the corners grooved or channelled out in a concave form so as
to present sharp scraping edges. Other prismatic shapes may however be used.
In order that the scrapers may readily accommodate themselves to the contour
of the boiler they are formed of several comparatively short blocks or sections
threaded on chains a or other flexible or articulated connecting media or carriers
fixed at one end to a bracket K and having a weight G attached to the other end
of each such assemblage of scraper blocks causing them to bear with some force
against the surface of the boiler.
In order that the scrapers may readily yield and pass over such obstacles to
their free passage as rivet heads or the joints of the plates we provide pivoted
compensating levers and counterpoises.
In the bottom flue bb are the compensating levers pivoted at ce in the carriage d
and having counterpoises e e. In the side flues the curved bars carrying the
scrapers are pivoted at c c in the carriages d' d¹. In this case the diagonal
position of the carriages d' d' renders the use of balance weights unnecessary.
One or more such scrapers may be applied to each flue. The feet of the
carriages d' d' rest in channelled or other suitably shaped rails r in which the
scrapers are slid lengthwise of the boiler either by hand at intervals or continuously
by power transmitted by chains frods wire rope or other convenient means.
By the use of such appliances the soot is scraped from the boiler shell and
falls to the bottom of the flues whence it may be removed at convenient
intervals.
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―
1. The apparatus for scraping soot from the surfaces of steam boilers sub-
stantially as herein before described and shown in the accompanying drawings.
2. In a boiler scraping apparatus a scraper comprised of an assemblage of
scraper blocks threaded on a flexible connecting medium substantially as and
for the purpose hereinbefore described and shown in the accompanying drawings.
3. The combination of sectional scraper blocks a flexible connecting medium
pivoted carriers therefor and a stretching weight substantially as and for the
purpose hereinbefore described and shown with reference to the accompanying
drawings.
4. The combination of a compound flexible scraper pivoted levers as bb and
counterpoises as ee substantially as and for the purpose hereinbefore described and
shown with reference to the accompanying drawings.
5. In a boiler scraping apparatus the combination of pivoted carrying bars
such as bb¹ with longitudinally movable carriages such as d'd' substantially as and
for the purpose hereinbefore set forth.
6. In boiler scraping apparatus the use of scraper blocks having concave
surfaces substantially as and for the purpose hereinbefore set forth.
Dated this 17th day of February 1893.
EDWARD TURNER WHITELOW,
70, Deansgate, Manchester, Agent for the Applicants.