IMPROVEMENTS IN SCRAPERS FOR CLEANING BOILER TUBES
Year: 1867

page_text: In the Matter of a Patent granted to JAMES MANNOCK, of Windsor
Road, Oldham, for "IMPROVEMENTS IN SCRAPERS FOR CLEANING
BOILER TUBES," bearing date at Westminster the 16th day' of
July 1867 (No. 2086).
5 DISCLAIMER AND MEMORANDUM OF ALTERATION proposed to
be entered by the said James Mannock, as such Patentee as afore-
said, pursuant to the Statutes in that case made and provided.
WHEREAS I have ascertained that before the date of the said Letters
Patent it had been proposed to use scraping instruments, each acting on
O a row or series of tubes, and held up towards such row or series of tubes
by their weight acting with inclines:
And whereas I have been advised that my said Specification may be
held to claim such scraping instruments so acting and held:
And whereas I have no wish to retain or make any such extended
5 claim to Invention, but desire to limit my claim in such manner that it
may apply only to tube scrapers with scraping segments or scrapers,
each acting on a segment of the circumference of one only of the tubes,

page_text: I for these reasons wish to disclaim and to alter my said Specification;
and I do hereby disclaim and alter my said Specification by introducing
into the first claiming clause the limiting words, "having scraping
" segments or scrapers, each acting on a segment of the circumference
"of one only of the tubes."
And in order that the effect of this Disclaimer and Memorandum of
Alteration may be better understood I annex a copy of the Specification
as it will appear when such Disclaimer and Memorandum of Alteration
have been made as aforesaid.
"
"This Invention has for its object improvements in scrapers for
cleaning boiler tubes, more especially tubes arranged vertically in the
"flue for heating the feed water. For this purpose the scrapers are
"formed in two or more segments, which segments are carried in a
"suitable cup or holder encircling loosely the tube to be cleaned; the
-" bottom of the cup or holder is formed with an inclined surface, and
"the under side of the scraper is formed with a corresponding incline;
by these means the segments of which the scraper is formed will at all
" times be in contact with the surface of the tube, the weight of the
scrapers tending at all times to keep them in action. The segments
may be formed with any suitable scraping edges, and the cup or holder
"for containing them may have holes formed in its under side in order
" to prevent choking."
CE
"
66
"
Figure 1 is a vertical section, Figure 2 a side view, and Figure 3 a
"plan of a tube with a scraper of this description upon it.
"a is the tube; it is one of a set of vertical tubes arranged in the
"furnace flue; these tubes are conveniently several feet long, and, say,
"four inches in diameter. 6 is a cup or holder fitting loosely around
"the tube a; there is one of these cups or holders for each of the tubes,
" and they are all carried by a frame which by any convenient mechanism
" is slowly raised and lowered so as to pass from end to end of the tubes,
66 say once every ten minutes.
c, c, are scrapers of cast iron; they have
"scraping edges at c³, c³, and these edges which are chill cast bear
"against the tube; they are caused to do so by the weight of the
"scrapers acting with the inclines c*, c*, on their under sides, and
"the inclines 6*, 6*, on the cup or holder; these scrapers are thus
" caused to travel over the surface of the tubos, and being constantly
26
kept in contact with them they effectually remove any soot or deposit
there may be upon them. In some cases in place of forming scrapers

page_text: " as before mentioned I use a series of plates having inclines formed on
"them tending at all times to keep the edges of the plates in action;
in both cases the scrapers are moved up and down the tubes to bo
"cleaned by any suitable gearing."
Figure 4 is a vertical section of a tube with scrapers upon it
"arranged in this manner, and which are carried up and down the
"tube as already stated. a is the tube, and 61, 62, 6, 6, are ring plates
"of cast iron, each with a scraping edge 6* upon it, passing some-
"what less than half around the tube. In casting the ring plates the
scraping edges are cast against chills to harden them.
"Figures 5, 6, 7, and 8 are plans of the ring plates 61, 6, b³, b',
"respectively. It will be seen that each ring plate has four lumps 6**
upon it, and that inclines are formed on the tops of these lumps. The
"plate b¹ is placed on the top of the plate 6%, the inclines 6** bearing
"the one on the other, so that the weight of the plates acting with the
"inclines tends to draw the plates inwards, and make their scraping
.
two
"edges bear on the tube; a pin and notch keeps the ring plates in
"position, as the Drawing indicates. The arrangement of the two lower
"ring plates is in all respects similar. 6*** is a pin on the plate 68
taking into a corresponding hole in the plate 6*.
CE
"I would remark that the form and arrangement of the parts admits
"of variation; but what I claim is,―
"The arranging tube scrapers having scraping segments or scrapers,
"each acting on a segment of the circumference of one only of the
"tubes in such manner that the weight of the scrapers acting with
" inclines causes the scrapers to bear against the tubes.
"I also claim the constructing such scrapers in the manner herein
c shown and described."
In witness whereof, I, the said James Mannock, have hereunto set
my hand and seal, this Third day of February, in the year
Witness,
JOHN CHADWICK,
2, Victoria St.,
Manchester.
JAMES MANNOCK. (L.S.)

page_text: To the Clerk of the Patents for Inventions.
I hereby grant my fiat to the above-named James Mannock, to file in
the Great Seal Patent Office, with the Specification to which the same
relates, the above written Disclaimer and Memorandum of Alteration.