A New or Improved Apparatus for Removing Scale from the Internal Surfaces of Steam Boilers.
Year: 1886

page_text: Date of Application, 10th Apr., 1886.
Complete Left, 10th Jan., 1887.
Complete Accepted, 11th Feb., 1887.
A New or Improved Apparatus for Removing Scale from the
Internal Surfaces of Steam Boilers.
I, WILLIAM GLASS WRENCH of 5 Oswald Street Glasgow in the County of
Lanark, Consulting Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object to facilitate the removal by improved mechanical
apparatus of the thick and hardened saline or other scale or incrustation from such
internal parts of steam boilers as are difficult of access or quite inaccessible with the
ordinary sealing bars, hammers, and other instruments at present in use, the invention
being particularly applicable for the removal of incrustation from the sides and backs
of combustion chambers and the plates between tubes in marine boilers, the cylindrical
surfaces surrounding the fire-boxes of donkey and other upright boilers, "Galloway"
tubes, the fire-boxes of locomotives and like parts of steam boilers.
The apparatus constituting the invention consists of a hammer or pick, a frame or
strut to which the pick is jointed, a suspender for localising the position of the
mechanism and a rod or lever by which the pick is operated from any desired distance
or point.
.
The hammer or pick may be of any desired form but is preferably in the form of a
quadrant or other segment of a circle terminating at its acting extremity in a sharp
edge or point whilst from the other end of the curve an arm is extended the said arm
being pivotted in one end of the frame or strut hereinbefore referred to, and which
end serves as a fulcrum for the radius arm and arc of the pick the are passing through
a slot made in the frame, or the frame or strut may be composed of two links or bars
with a space between them for the passage of the pick. The end of the frame to
which the arm of the pick is pivotted rests upon the plate or other part of the boiler to
be scaled whilst the other and lower end of the frame, which is suspended by a rope,
chain, or its equivalent, is held in contact with the opposite wall or side of the space
being operated in.
The strut or frame whilst always keeping the pick uniformly to its work is
adjustable to any angle within certain limits to adapt itself to the varying width or

page_text: taper of the aperture or space within which the apparatus is being used, and is capable
of being inclined to or nearly to a vertical position so as to enter a space slightly
Jarger than the pick itself. The strut or frame in any working position is effectually
held or jammed between the two opposite surfaces by the slightest tension on the
suspending rope or chain which has the effect of causing the upper end of the strut to
fall or rest upon the surface to be scaled, in which position it becomes a fixed fulcrum
for the operations of the pick. The pick is actuated by a lever or rod connected to it
by a pin passed through an eye at or near the junction of the radius arm and the
curved or acting portion, and the connection is such that the lever or rod may be
removed and a longer or shorter one substituted; or the rod may be extended as
required by screwing or connecting additional lengths to it.
To give the apparatus a still wider range of adaptability the strut or frame may be
made telescopic or extensible by means of an eye bolt screwed into its lower end or by
an equivalent device, and in such case the shackle of the suspending cord or chain is
attached to the adjustable part at the lower end of the strut.
Under a modified arrangement adapted for operating on horizontal or nearly
horizontal surfaces the frame or strut may constitute two sides of a triangle with the
pick jointed or fulcrumed at the apex, the base of the triangle being formed either by
the wall of the space opposite to that being acted upon or by an adjustable link
extending between the legs.
CRUIKSHANK & FAIRWEATHER,
Glasgow, Agents.

page_text: A New or Improved Apparatus for Removing Scale from the
Internal Surfaces of Steam-boilers.
1, WILLIAM GLASS WRENCH of 5 Oswald Street, Glasgow, in the County of
Lanark, Consulting 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 :
-
This invention has for its object to facilitate the removal by improved mechanical
apparatus of the thick and hardened saline or other scale or incrustation from such
internal parts of steam boilers as are difficult of access or quite inaccessible with the
ordinary scaling bars, hammers and other instruments at present in use, the invention
being particularly applicable for the removal of incrustation from the sides and backs
of combustion chambers and the plates between tubes in marine boilers, the cylindrical
surfaces surrounding the fire-boxes of donkey and other upright boilers, "Galloway
tubes, the fire-boxes of locomotives and like parts of steam boilers.
""
As represented in the accompanying drawings in side and end elevations at
figures 1 and 2, the apparatus constituting the invention consists of a hammer or
pick A, a frame or strut B, to which the pick is jointed, a suspender C, for localising
the position of the mechanism and a rod or lever D, by which the pick is operated
from any desired distance or point.
The hammer or pick A, may be of any desired form but is preferably in the form of
a quadrant or other segment of a circle terminating at its acting extremity in a sharp
edge or point a whilst from the other end of the curve an arm a is extended, the said
arm being pivotted in one end of the frame or strut B, hereinbefore referred to, and
which end or its joint pin 6 serves as a fulcrum for the radius arin and arc of the pick,
the are passing through a slot made in the frame, or the frame or strut may be
composed of two links or bars as shown with a space between them for the passage of
the pick. The end of the frame B, to which the arm of the pick A, is pivotted resis
when the apparatus is in operation as represented at the lower end of the diagram
figure 6, upon the plate E, or other part of the boiler to be scaled whilst the other and
lower end of the frame, which is suspended by a rope or chain C, or its equivalent, is
held in contact with the opposite wall or side E¹, of the space being operated in.
The strut or frame B, whilst always keeping the pick A, uniformly to its work, is
adjustable to any angle within certain limits to adapt itself to the varying width or
taper of the aperture or space within which the apparatus is being used, and is capable
of being inclined to or nearly to a vertical position so as to enter a space slightly
larger than the pick itself. The strut or frame in any working position is effectually
held or jammed between the two opposite surfaces, as E, E, figure 6, by the slightest
tension on the suspending rope or chain C, which has the effect of causing the upper
end of the strut B, to fall or rest upon the surface (E) to be scaled, in which position
it becomes a fixed fulcrum for the operations of the pick. The pick is actuated by a
lever or rod D, connected to it by a pin d passed through an eye at or near the
junction of the radius arm a' and the curved or acting portion A, and the connection

page_text: is such that the lever or rod may be removed and a longer or shorter one substituted,
or the rod may be extended as required by screwing or connecting additional lengths
to it.
To give the apparatus a still wider range of adaptability the strut or frame B, may
be made telescopic or extensible by means of an eye bolt B', screwed into its lower
end or by an equivalent device, and in such case the shackle of the suspending cord or
chain C is or may be attached to the adjustable part at the lower end of the strut.
As shown in a modified form at figures 3 and 4, the pick instead of being directly
connected to the actuating rod or lever may be actuated by a hammer F, at the lower
end of a rod D, and fitted to slide in a guide frame G, attached to the pick; and to
provide for renewal and sharpening the acting point a of the pick may be formed
separately from the body of the pick and screwed or otherwise secured thereto as
shown at figure 5.
Under a modified arrangement adapted for operating on a horizontal or nearly
horizontal surfaces the frame or strut may constitute two sides of a triangle with the
pick jointed or fulcrumed at the apex the base of the triangle being formed either by
the wall of the space opposite to that being acted upon, or by an adjustable link
extending between the legs.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed, I declare that what I claim is :-
The combination of parts constituting the improved apparatus for removing scale
from the internal surfaces of steam boilers substantially as described with reference to
the drawings annexed,