An Improvement connected with Triple Scrapers employed on Tubes of Fuel Economisers.
Year: 1892

page_text: Date of Application, 27th Dec., 1892
Complete Specification Left, 26th Sept., 1893—Accepted, 4th Nov., 1893
PROVISIONAL SPECIFICATION.
An Improvement connected with Triple Scrapers employed on
Tubes of Fuel Economisers.
I, Sir EDWARD GREEN, Baronet, of Wakefield, in the County of York, Fuel
Economiser Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention has for object, constructing triple scrapers used on the pipes of
fuel economisers in such manner that when put in place they collectively touch the
circumference of the pipe for scraping it all round while being moved up and
down, or otherwise by the usual reversing gear with which fuel economisers are
fitted.
Each section of my improved scraper has a scarf or angle faced surface from
each segmental web which bear in contact when fitted.
The segmental scraper portions are at top and bottom to suit and are connected
by the stem which has the usual ear lug for sitting on the moving frame, the ear
lug being so shaped that each scraper falls or slides against the pipe by the
pressure of its own weight only. The scraping edge is at the upper part of each
segment.
The sections are three in number, and one of them has plain chamfered ends at
each scraper, the second has an inner lump next and forming part of one chamfer
only, the third having a lump next and forming part of each chamfer, the lumps
serving for bearings of the plain parts.
Dated this 27th day of December 1892.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Sir Edward Green, Bart.
COMPLETE SPECIFICATION.
An Improvement connected with Triple Scrapers employed on
Tubes of Fuel Economisers.
I, Sir EDWARD GREEN, Baronet, of Wakefield, in the County of York, Fuel
Economiser Manufacturer, 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, constructing triple scrapers used on the pipes of
fuel economisers in such manner that when put in place they collectively touch the
circumference of the pipe for scraping it all round while being moved up and
down, or otherwise by the usual reversing gear with which fuel economisers are
fitted.
My invention is shown in the annexed drawings.
Figure 1, perspective elevation of the segmental scrapers complete.
Figure 2, elevation of the two corresponding segmental scrapers.
Figure 3 view of the third or intermediate segmental scraper.
Figure 4 part sectional elevation showing a tube of a fuel economiser, and having
the scraper edges in contact therewith.
Each section A, B, C, of my improved scraper has a scarf or angle faced
surface a, a, b, b, c, c, from each segmental web e, f, g, which bear in contact when
fitted.
The segmental scraper portions e, f, g, are at top and bottom respectively and are

page_text: connected by the stem or bar G, H, I, which has the usual car lug J, K, L, for
sitting on the moving frame, the ear lugs J, K, L, being formed with an inclined
under face, so that each scraper falls or slides against the pipe by the pressure of
its own weight only.
The scraping edges e, f, g are at the upper part of each segment A, D, B, E,
and C, F.
One of the segmental pieces A has a lump
on each side at each end and has
the chamfers u, a, formed from the lumps h, h, the two chamfers on the piece A
are struck from the same point i from above its webs e, e, as shown by the dotted
lines, Figure 2.
The next segment B has a lump h on one side only, and with the chamfer b struck
from a point in the same relative position as the chamfers of A, the other side of
segment B being without a lump and its edge chamfered at a reverse angle. The
third segment C has chamfered edges struck from a point from below its webs g, g,
as shown by the dotted lines, Figure 3.
The three segments are so arranged that the plain chamfered edges fit slidingly
úpon the chamfers of the lumps having corresponding angles.
The above mentioned method of construction of double segmental scrapers A, D,
B, E, and G, F, and their arrangement one with the other in the manner shown
and herein described allows of the easy assembling of the segments in their proper
place on the carrier by inserting them in the order of their alphabetical enumera-
tion, and they can be as easily taken apart by withdrawing the segments in their
reverse order, that is to say, C, F, B, E, and A, D, in the order named.
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. As scrapers for fuel economiser tubes, three segmental double ended
appliances A, B, C, with upper edged scraper surfaces, each segment being
provided with angled ends, broad and narrow, as set forth, for yielding and falling
into contact, and so keeping the scraping edges against the tube during the upward
and downward travel of the scrapers, as described and substantially as shown.
2. Constructing fuel economiser tube scrapers in three double segmental
pieces A, D, B, E, and C, F, each pair of segments being connected by bars G, H, I,
respectively and having their ends chamfered angularwise, and formed with broad
and narrow faces for sliding contact one with another, the angle of the broad faces
being struck from a point above, and the narrow faces from a point below the
scraper edges e, f, g, which are at the upper part of each segment, all as described
and substantially as shown.
The 26th day of September 1893.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Sir Edward Green, Bart.