Apparatus for Removing Scale from Stay-bolts, Stays, and the like in Steam Boilers.
Year: 1894

page_text: Date of Application, 12th Jan., 1894
Complete Specification Left, 19th Jan., 1894-Accepted, 31st Mar., 1894
PROVISIONAL SPECIFICATION.
Apparatus for Removing Scale from Stay-bolts, Stays, and the like
in Steam Boilers.
I, HENRI BASCHY, of Hafenstrasse 36, Hamburg, Germany, Engineer, do
hereby declare the nature of this invention to be as follows:-
Notwithstanding the large number of apparatus that have heretofore been
designed for removing boiler scale from steam boilers, none so far as I am aware
have been capable of removing scale from stay bolts, and this invention has
reference to a construction of apparatus whereby this operation can be successfully
effected.
In the accompanying drawings,
Fig. 1 is a vertical section partly in elevation; and,
Fig. 2 a side elevation showing scale removing apparatus constructed according
to this invention.
Figs. 3 and 4 are sections on the lines A--B and C-D respectively of Fig. 2.
Figs. 5, 6 and 7 are detail views showing a device for operating the cutters,
Fig. 5 showing the device in its "rest position," Fig. 6 in its operative position,
and Fig. 7 being a section on the line E-F of Fig. 6.
The apparatus comprises four semi-circular cutters mounted in a suitably
constructed frame or casing, and mechanism for operating the said cutters and for
advancing the apparatus. The frame or casing is formed of two side bars a
between which are arranged two U-shaped sliding pieces arranged one above the
other, and each formed with a square hole at the bend. cc are pins formed on the
sides of said sliding pieces. Upon them are pivotted four cutter-holders d to
which the semi-circular cutters fare fastened by screws. The cutter-holders are
formed on their sides furthest from the cutters with projections d' that take into
slots in the adjacent side piece a. Within the casing formed by the two side
bars a and the two sliding pieces are five parts h, i, k,l and m shaped after the
fashion of claw-couplings, these parts being mounted on a spindle g which traverses
the casing. The middle one of the said coupling pieces is fixed on the spindle,
whilst the others are loose on the spindle. The claws of the coupling pieces are
so shaped, as shown, that when the spindle is rotated in either direction, the
outer pieces / and m will always be moved away from the middle piece k, for the
reason that they are provided with a square part n and o respectively which being
located in the correspondingly shaped holes in the sliding parts b, prevent the
pieces and m from following the rotary motion of the spindle. Outside the
casing, and mounted on the spindle g, there are two coiled springs p which bear at
their outer ends against two cross bars y fixed to the ends of the side bars a, and
which have a tendency to press the coupling pieces, and consequently also the
cutters, towards each other. The upper end of the spindle is formed with a
square portion upon which can be fixed a hand wheel or other device for imparting
rotary motion to the spindle. On the lower end of the spindle there is fixed a
bevel wheel, which gears with another bevel wheels provided internally with a
screw-thread so as to form a nut. Through this latter wheel there works a screw-
threaded rod t which is so mounted in a bent piece u carried by the lower cross
piece 9
that it is capable of moving endways but not of rotating with the bevel
wheels.
The length of this screw rod is made equal to the length of the stay-
bolts to be scaled. vis a hook fixed to one of the side bars a aud by means of
which the apparatus can be supported on the stay-bolt that is to be treated.

page_text: The operation of the apparatus is as follows:-
The apparatus with its cutters in the open position is suspended by means of the
hook on the stay-bolt to be cleared of scale in such a manner that one pair of
cutters lies close to the side of the boiler, whilst the right hand end (Fig. 1) of the
screw rod is brought level with the outer surface of the bent piece u. Then by
means of the handwheel, the spindle y is rotated in a right-hand direction, for
instance, whereby the coupling piece carries the pieces i and round with it,
whilst the pieces and m are caused to ride along the inclined surfaces of i and 1,
as shown in Fig. 6, that is to say, are moved away from each other. By this
action the U-shaped sliding pieces are forced away from each other, and the
cutter-holders, and consequently the cutters, would follow this movement if they
were not prevented from doing so by the slots & in one of the side bars a. The
result is that the cutters are moved apart scissors-fashion until the claws of the
pieces and m coincide or come opposite the corresponding recesses in the claws
of i and I. When this happens, the pieces h and m are forced together again by
the action of the springs p, whereby the cutters are caused to strike the stay-
bolts and thus chip off the boiler scale therefrom. This operation is repeated
thrice during each revolution of the spindle, that is to say, corresponding with the
number of claws on each of the coupling pieces h, m. At the same time the bevel
wheel rotates the wheels and thus causes the apparatus to advance along the
screw rod t. In this manner the stay-bolt is gradually cleared of boiler scale from
end to end.
It will be readily understood that when the spindle g is rotated in a left-hand
direction the apparatus will operate in a similar manner, as then the riding of the
inclined surfaces of the coupling pieces and upon those of the piece k will also
act to force the sliding pieces apart in the manner described. In this case
however the apparatus will be caused to move in the opposite direction along the
Stay bolt.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.
COMPLETE SPECIFICATION.
Apparatus for Removing Scale from Stay-bolts, Stays, and the like
in Steam Boilers.
I, HENRI BASCHY, of Hafenstrasse 36, 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:—
Notwithstanding the large number of apparatus that have heretofore been
designed for removing boiler scale from steam boilers, none so far as I am aware
have been capable of removing scale from stay bolts, and this invention has
reference to a construction of apparatus whereby this operation can be successfully
effected.
Referring to the drawings filed with my Provisional Specification
Fig. 1 is a vertical section partly in elevation; and,
Fig. 2 a side elevation showing scale removing apparatus constructed according
to this invention.
Figs. 3 and 4 are sections on the lines A-B and C-D respectively of Fig. 2.
Figs. 5, 6 and 7 are detail views showing a device for operating the cutters,
Fig. 5 showing the device in its "rest_position," Fig. 6 in its operative position,
and Fig. 7 being a section on the line E-F of Fig. 6.

page_text: The apparatus comprises four semi-circular cutters mounted on a suitably
constructed frame or casing, and mechanism for operating the said cutters and for
advancing the apparatus. The frame or casing is formed of two side bars a
between which are arranged two U-shaped sliding pieces arranged one above the
other, and each formed with a square hole at the bend. ccare pins formed on the
sides of said sliding pieces. Upon them are pivotted four cutter-holders & to
which the semi-circular cutters fare fastened by screws. The cutter-holders are
formed on their sides furthest from the cutters with projections d' that take into
slots d² in the adjacent side piece a. Within the casing formed by the two side
bars a and the two sliding pieces are five parts h, i, k,l and m shaped after the
fashion of claw-couplings, these parts being mounted on a spindle g which traverses
the casing. The middle one of the said coupling pieces is fixed on the spindle,
whilst the others are loose on the spindle. The claws of the coupling pieces are
so shaped, as shown, that when the spindle is rotated in either direction, the outer
pieces and m will always be moved away from the middle piece k, for the reason
that they are provided with a square part n and o respectively which being located
in the correspondingly shaped holes in the sliding parts b, prevent the pieces h and m
from following the rotary motion of the spindle. Outside the casing, and mounted
on the spindle y, there are two coiled springs p which bear at their outer ends
against two cross bars fixed to the ends of the side bars a, and which have a
tendency to press the coupling pieces, and consequently also the cutters, towards
each other. The upper end of the spindle is formed with a square portion upon
which can be fixed a hand wheel or other device for imparting rotary motion to
the spindle. On the lower end of the spindle there is fixed a bevel wheel " which
gears with another bevel wheels provided internally with a screw-thread so as to
form a nut. Through this latter wheel there works a screw-threaded rod t which is
so mounted in a bent piece u carried by the lower cross piece 9 that it is capable
of moving endways but not of rotating with the bevel wheels. The length of
this screw rod is made equal to the length of the stay-bolts to be scaled. is a
hook fixed to one of the side bars a and by means of which the apparatus can be
supported on the stay-bolt that is to be treated.
The operation of the apparatus is as follows
11
ין
The apparatus with its cutters in the open position is suspended by means of the
look on the stay-bolt to be cleared of scale in such a manner that one pair of
cutters lies close to the side of the boiler, whilst the right hand end (Fig. 1) of the
screw rod t is brought level with the outer surface of the bent piece u.
Then by
means of the hand wheel, the spindle g is rotated in a right-hand direction, for
instance, whereby the coupling piece carries the pieces and round with it,
whilst the pieces h and m are caused to ride along the inclined surfaces of i and 1,
as shown in Fig. 6, that is to say, are moved away from each other. By this
action the U-shaped sliding pieces bare forced away from each other, and the
cutter-holders, and consequently the cutters, would follow this movement if they
were not prevented from doing so by the slots in one of the side bars a.
result is that the cutters are moved apart scissors-fashion until the claws of the
pieces and m coincide or come opposite the corresponding recesses in the claws
of i and . When this happens, the pieces and m are forced together again by
the action of the springs p, whereby the cutters f are caused to strike the stay-
bolts and thus chip off the boiler scale therefrom. This operation is repeated
thrice during each revolution of the spindle, that is to say, corresponding with the
number of claws on each of the coupling pieces h m. At the same time the bevel
wheel r rotates the wheels and thus causes the apparatus to advance along the
screw rod t. In this manner the stay-bolt is gradually cleared of boiler scale from
end to end.
The
It will be readily understood that when the spindle g is rotated in a left-hand
direction the apparatus will operate in a similar manner, as then the riding of the
inclined surfaces of the coupling pieces i and upon those of the piece k will also
act to force the sliding pieces 6 apart in the manner described. In this case

page_text: however the apparatus will be caused to move in the opposite direction along the
stay bolt.
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 boiler scale from stay-bolts, stays and the like, in
which semi-circular cutters are moved scissors-fashion away from one another by
means of a device having an intermittent cam-like action and subject to the pressure
of springs by which the said cutters are brought together again each time the
cam-like action of the said device ceases, whereby the said cutters are caused to
remove the boiler scale from a stay-bolt located between them as set forth.
2. In apparatus of the kind specified in the preceding claim, mechanism for
operating the cutters, consisting of a spindle and five parts h, i, k, l, and m,
constructed after the manner of claw-coupling pieces of which the middle piece is
fixed to, and the others are loose, upon the said spindle, the arrangement being
such that when the spindle is rotated the inclined surfaces of the middle fixed
piece or of the intermediate loose pieces, according to the direction in which the
spindle is rotated, will cause the outer pieces and consequently the cutter-holders,
to first move apart at intervals, and then allow them to return again into their
inner positions, these operations being repeated during the rotation of the said
spindle substantially as herein described for the purpose specified.
3. For removing boiler scale from stay-bolts, stays and the like, apparatus
constructed arranged and operating substantially as described and shown.
Dated this 19th day of January 1894.
Dated this 19th day of January 1894.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.