Apparatus for Removing Scale from the Fire Tubes and other Parts of Steam Generators.
Year: 1894

page_text: Date of Application, 21st July, 1894
Complete Specification Left, Eth Aug.. 1894-Accepted, 29th Sept., 1894
PROVISIONAL SPECIFICATION.
Apparatus for Removing Scale from the Fire Tubes and other
Parts of Steam Generators.
I, HENRI BASCHY of Hafenstrasse 35, Hamburg, Germany, Engineer, do
hereby declare the nature of this invention to be as follows:-
The removal from the fire tubes of steam boilers of scale formed by salt or
other deposits from the feed water used, has up to the present time been effected
in an indifferent manner with ordinary tools.
Such
Now the object of this invention is to provide apparatus whereby the removal
of the scale can be effected in a very complete and advantageous manner.
an apparatus is illustrated in the accompanying drawings in which Fig. 1 is a side
view thereof, and Fig. 2 is a longitudinal section on the line -y of Fig. 1;
Figs. 3 and 4 are elevations at right angles to each other illustrating a simplified
construction of the apparatus suitable for special purposes;
Figs. 5 and 6 illustrate details of the apparatus shewn in Figs. 1 and 2.
The chipping apparatus proper, which is mounted on a long rod, comprises two
saucer or dished shaped parts a and b arranged with their edges facing each other
so as to form a chamber, or intermediate space, and a double chisel (Figs. 1, 2, 5
and 6) which is mounted so as to be capable of partial rotation in bearings in
recesses formed in the edges which are wider in the middle. The chisel consists of
two double-edged knife-heads c¹ c having their shanks rigidly connected together
by means of an axle e provided with two toothed pinions e* the shanks, axle and
pinions being of cast steel and preferably in one piece. The said pinions engage
with toothed racks on a sliding block d which is normally held in its position of
rest by two powerful flattened coiled springs e and f. The said block d is adapted
to slide between the thickened edges a a¹ of the saucer or dish shaped part a which
act as guiding fillets, and within the chamber formed between the two parts a
and b, and which also contains the springs e and f, so that the entire chipping
apparatus is smooth externally and only the chisel shanks c' c" with double edged
knife-beads project laterally therefrom.
The manipulation of the apparatus is very simple and is as follows:-The
apparatus is moved to-and-fro between the rows of the boiler tubes to be cleaned.
This operation is continued along the entire length of a tube, the apparatus being
shifted laterally from time to time through small distances. In this way one half
of the periphery of each of the several tubes forming a row, is scraped or chipped,
the other half being cleaned by placing the apparatus between that half and the
next adjacent row of tubes. This is effected in the following manner :-In moving
the apparatus along between the tubes, the smooth rear side of the apparatus slides
along one row of tubes, whilst the tubes of the other row are being chipped or
scraped, because by the double edged chisel heads which when passing through the
narrowest portions of the space between the tubes in adjacent rows are moved so
as to occupy a more or less vertical position (as shown in dotted lines in Figs. 1
and 2,) thereby placing the springs under strain and after passing each narrowest
portion of the said space the knife heads under the action of the springs have a
tendency to return into their position of rest at right angles to the side of the
apparatus and therefore impinge with great force upon the nearest tube. In this
way one quarter of the periphery of each tube in a row will be cleaned, by the
descent of the apparatus between two rows of tubes and the other quarter of the
periphery will be cleaned during the return travel of the apparatus.

page_text: With the aid of apparatus such as described, the hardest and thickest scale
deposited from feed water can be readily removed from boiler tubes. When the
deposits are not very hard, it is sufficient to use an apparatus such as illustrated in
Figs. 3 and 4, in which the chisel g is mounted so as to be capable of rotation on
a flat bar and is placed under strain by flat or leaf-springs i. The manipulation 5
and mode of operation of this modified construction of apparatus is exactly the
same as that of the apparatus first herein described.
Dated this 21st day of July 1894.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Apparatus for Removing Scale from the Fire Tubes and other
Parts of Steam Generators.
I, HENRI BASCHY, of Hafenstrasse 35, Hamburg, Germany, 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 :-
The removal from the fire tubes and other parts of steam boilers of scale
formed by salt or other deposits from the feed water used, has up to the present
time been effected in an indifferent manner with ordinary tools.
Now the object of this invention is to provide apparatus whereby the removal of
the scale can be effected in a very complete and convenient manner. Such an
apparatus is illustrated in the drawings filed with my Provisional Specification in
which,
Fig. 1 is a side view of part thereof, and
Fig. 2 is a longitudinal section on the line -y of Fig. 1.
Figs. 3 and 4 are elevations at right angles to each other illustrating a simplified
construction of the apparatus suitable for special purposes;
Figs. 5 and 6 illustrate details of the apparatus shewn in Figs. 1 and 2.
The chipping apparatus proper, which is mounted on a long rod, comprises
two saucer or dished shaped parts a and b arranged with their edges facing each
other so as to form a chamber, or intermediate space, and a double chisel (Figs. 1,
2, 5 and 6) which is mounted so as to be capable of partial rotation in bearings
formed in the said edges which are made wider in the middle part where the
bearings are formed. For the sake of clearuess the part bis omitted from Fig. 1.
The chisel consists of two double-edged knife-heads chaving their shanks
rigidly connected together by means of an axle c provided with two toothed
pinions c, the shanks, axle and pinions being of cast steel and preferably in one
piece. The said pinions engage with toothed racks on a sliding block d which is
normally held in its position of rest by two powerful Hattened coiled springs e and f
The said block is adapted to slide between the thickened edges a' a of the saucer
or dish shaped part a, which act as guiding fillets and within the chamber formed
between the two parts a and b, and which also contains the springs e and f, so that
the entire chipping apparatus is smooth externally and only the chisel shanks c' c²
with double-edged knife-heads project laterally therefrom.
The manipulation of the apparatus is very simple and is as follows:-
The apparatus is moved up and down between the rows of the boiler tubes to be
cleaned. This operation is continued along the entire length of a tube, the
apparatus being shifted laterally from time to time through small distances. In
this way one half of the periphery of each of the several tubes forming a row, is
scraped or chipped the other half being similarly cleaned by moving the apparatus
between that half and the next adjacent row of tubes.

page_text: This scraping or chipping is effected in the following manner :-
In moving the apparatus along between the tubes, the smooth rear side of the
apparatus slides along one row of tubes, whilst the tubes of the other row are
being chipped or scraped by the double-edged chisel heads which when passing
through the narrowest portions of the space between the tubes in adjacent rows
of tubes are moved so as to occupy a more or less vertical position as shown in
dotted lines in Figs. 1 and 2, thereby placing the springs e and under strain,
so that after passing each narrowest portion of the said space, the knife heads,
being under the action of the springs and consequently having a tendency to
return into their position of rest at right angles to the side of the apparatus,
will impinge with great force upon the nearest tube. In this way one quarter
of the periphery of each tube in a row will be cleaned for a width equal to the
width of the knife heads by each descent of the apparatus between two rows of
tubes, and the other quarter of the periphery on the same side of the row will
be cleaned during the return travel of the apparatus, after which the apparatus is
moved laterally and the operations repeated. The apparatus may also be operated
in a horizontal manner between the tubes instead of as above described.
With the aid of apparatus such as described, the hardest and thickest scale
deposited from feed water can be readily removed from boiler tubes. When
the deposits are not very hard, it is sufficient to use an apparatus such as
illustrated in Figs. 3 and 4, in which the chisel g is mounted so as to be capable
of rotation on a flat bar hand is placed under strain by flat or leaf-springs i.
The manipulation and mode of operation of this modified construction of apparatus
is exactly the same as that of the apparatus first herein described. The apparatus
serves also for removing scale from the tube plates.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. Apparatus for removing scale from the fire tubes of steam generators wherein
a chisel is mounted on a rod so as to be capable of partial rotation and is normally
held in its outwardly projecting position of rest by springs, the arrangement being
such that when the apparatus is forced between adjacent rows of tubes, the chisel
will, when passing the narrowest portions of the space between the tubes in adjacent
rows of tubes, be partly turned out of its normal position against the action of the
springs, and then released so that the chisel or tool, under the action of its springs,
will be caused to strike the next succeeding tube in the row and then be drawn
forcibly over part of its periphery thereby chipping and scraping scale therefrom
as set forth.
2. Scale removing apparatus constructed arranged and operating substantially as
herein before described with reference respectively to and shown in Figs. 1, 2, 5
and 6; and in Figs. 3 and 4 of the drawing.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.