Improvements in Apparatus for Removing Boiler Scale from Tube Plates, Fire Tubes, and the like.
Year: 1894

page_text: Date of Aplication, 29th May, 1894
Complete Specification Left, 22nd June, 1894-Accepted, 28th July, 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Removing Boiler Scale from Tube
Plates, Fire Tubes, and the like.
I, JOHANNES CORNELIUS AMANDUS MARCKMANN, of Johannisbollwerk 15,
Hamburg, Germany, Manufacturer, do hereby declare the nature of this invention
to be as follows:-
As is well known, the corners and pockets formed by the walls or sides and fire
tubes of steam boilers, constitute the most favourable places for the deposition and
accumulation of salt, boiler scale and other deposits from the feed water, and this is
found by experience to be the main cause of leakages, because the thorough
removal of the deposits is not possible by means of the usual tools, so that at such
places corrosion of the material is able to proceed without hindrance.
The accompanying drawings illustrate apparatus according to this invention
having for its object to enable the aforesaid drawbacks to be thoroughly and
conveniently obviated.
Fig. 1 is a side elevation partly in section, and
Fig. 2 is a partial front elevation.
a is a frame carrying rotary shafts c on, which are fixed strikers d that each
consists of a broad part d situated within the frame, and a narrower part d², situated
outside the frame, and are formed with saw-like teeth on both striking sides. b is a
bent-piece fixed by screws e to the frame a. An operating rod.b' is pivoted to the
piece b, and an operating rod a' is pivoted to the frame a. f is a leaf or plate
spring held in position inside the stirrup-piece 6 by means of a pin or stud g; its
ends are made to cross each other and are connected by means of small' connecting
links to cranks k which are fixed on the shafts c and hold the strikers d in their
middle position. A strong cross piece m formed with a hole for the reception of a
handle n is provided at the end of the operating rod a¹. The operation of the
apparatus is as follows:-
:-
The frame a is forced down between any two rows of tubes, if necessary by
means of blows of a hammer upon the cross piece m, so that the toothed strikers
clean the upper halves of the circumferences of the tubes. The apparatus is then
driven in an upward direction, it may be by means of blows of a hammer against
the underside of the crosspiece m and the lower halves of the circumferences of the
tubes freed from scale. The spring presses the strikers with force against the
tubes which are scraped clean by the sharp teeth sliding over them.
::
The wider parts of the strikers serve for cleaning the tubes themselves, whilst
the narrow parts d' have for object to remove the incrustations of salt or scale from
the corners at the tube plates. To effect this object the apparatus is driven
against the tube plate by means of blows of a hammer delivered upon the head of
the obliquely held driving rod , the heads of the screw bolts e constituting
abutments to the blows, so that the strikers d' are enabled to penetrate with their
side edges deeply into the corners and pockets.
In order to render the apparatus more effective, the number of strikers may be
increased as desired.
Dated this 28th day of May 1894.

page_text: Improvements in Apparatus for Removing Boiler Scale from Tube:
Plates, Fire Tubes, and the like.
I, JOHANNES CORNELIUS AMANDUS MARCKMANN, of Johannisbollwerk 15,
Hamburg, Germany, 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 :-
As is well known, the corners and pockets formed by the walls or sides and fire
tubes of steam boilers, constitute the most favorable places for the deposition and
accumulation of salt, boiler scale and other deposits from the feed-water, and this is
found by experience to be the main cause of leakages, because the thorough
removal of the deposits at such parts is not practicable by means of the usual tools,
so that at such places corrosion of the material of the boiler is able to proceed
without hindrance.
The drawings filed with my Provisional Specification illustrate apparatus
according to this invention designed to enable the aforesaid drawbacks to be
thoroughly and conveniently obviated.
Fig. 1 being a side elevation, partly in section, and
Fig. 2 a partial front elevation.
a is a frame carrying rotary shafts c on which are fixed strikers d each of which
consists of a broad part d situated within the frame, and a narrower part d',
situated outside the frame, each part being formed with saw-like teeth on both
striking sides. bis a bent piece or stirrup fixed by screw bolts e to the frame a.
An operating rod 61 is pivotted to the piece b, and an operating rod a' is pivotted to
the frame a. f is a leaf or plate spring held in position inside the stirrup-piece b
by means of a pin or stud 9; its ends are made to cross each other and are connected
by means of small connecting links to cranks k fixed on the shafts c and so hold
the strikers d in their middle position. A strong cross piece m formed with a hole
for the reception of a handle n is provided at the end of the operating rod a'.
The operation of the apparatus is as follows:-
The frame a is forced down between any two rows of tubes, as shown, if necessary
by means of blows of a hammer upon the cross piece m, so that the toothed strikers
are caused to scrape and clean the upper halves of the circumferences of the tubes
by being drawn forcibly over them, the strikers upon leaving,one tube being forced
rapidly by the spring into contact with the next tube. The apparatus is then
driven in an upward direction, it may be by means of blows of a hammer against
the underside of the cross piece m and the lower halves of the circumferences of the
tubes are similarly freed from scale by the strikers: The spring presses the
strikers with force against the tubes which are scraped clean by the sharp teeth
sliding over them.
The wider parts d of the strikers serve for cleaning the tubes themselves, whilst
the narrow parts d' have for object to remove the incrustations of salt or scale from
the corners at the tube plates. To effect this object the apparatus is driven
against the tube plate by means of blows of a hammer delivered upon the head of
the obliquely held driving rod 6, the heads of the screw bolts e constituting
abutments to the blows, so that the strikers d' are enabled to penetrate with their
side edges deeply into the corners and pockets.
In order to render the apparatus more effective, the number of strikers may be
increased as desired:

page_text: 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. For removing boiler scale from tube plates fire tubes and the like, apparatus.
comprising a frame a provided with strikers such as d d' having serrated active
surfaces that are adapted to be forced by means of a spring such as fagainst the
tubes or tube plates to be scaled or cleaned when the apparatus is forced between
the rows of tubes substantially as herein described.
2. The improved apparatus for removing boiler scale from tube plates, fire tubes.
and the like, constructed and arranged substantially as described and shown.
Dated this 22nd day of June 1894.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.