Year: 1897

page_text: We, JOHN CLEMENT MINTO, of Wesley Street, West Hartlepool, and WILLIAM
MINTO, of Ashfield Terrace, Stockton-on-Tees, both in the County of Durham,
Engineers, do hereby declare the nature of this invention to be as follows;-
This invention relates to an appliance or apparatus for detaching scale from boiler
plates and is especially applicable in the case of boilers having water spaces con-
fined by vertical walls of great depth relatively to the enclosed space such as are
constructed in marine boilers and which are inaccessible for the purpose of remov-
ing the scale by hammer and chisel. Hitherto a chisel-ended long bar has been
used to detach the scale to a limited depth beyond which it ceases to be effective
owing to the insufficient angle of the stroke relatively to the surface of the boiler
plate, and consequently the injurious practice of hammering the plate on the
opposite side has been resorted to for the purpose of detaching the scale.
The object and result of our invention is to provide an appliance or tool which
impacts a chipping point against the boiler plate surface in any required number
of blows directed at will to any part of the surface to be cleaned, and in effect
serves all the purposes of a hammer and chisel in places where a hammer and
chisel cannot be used.
In carrying out our invention we provide a hammer plate which may conveniently
take the shape of a sector of a circle the said hammer plate being pivotally slung
at the point from which it radiates from a hanger rod extending down from some
convenient position of support alongside the plate to be cleaned. An operating
rod is also pivotally connected the sector plate at some inter-
mediate point on the upper edge thereof between the centre point and
the rim, the said point of connection affording a suitable leverage for lifting the
hammer plate about its centre, and thrusting it with the requisite impact against
the boiler plate. The rim of the hammer plate is made heavy and terminates with
a chipping point.
We would here remark that the sector form of hammer plate is only to be taken
as a convenient form for illustrating our invention and is representative of many
equivalent forms or modifications from which the like mode of similarly operating
the chipping point can be carried out. In ordinary cases the hanger bar is sup-
ported from cross bars mounted on the cross stays extending between opposite
plates of the water space. Two such cross bars held together by butterfly screws
to grip the boiler stays which come between, serve this purpose. A collar of india
rubber or other equivalent device is made use of, so that the hanger bar will retain
any position to which it is set by frictional contact only but may be readily adjusted
to any other required position by the use of moderate force. Stays are used as
required to steady the hanger bar and guide the operating bar, the stay extending
across from its connection with the hanger bar to the opposite boiler plate against
which it makes an abutment. This combined stay and guide is vertically and

page_text: otherwise adjustable as to its position to allow the appliance to be used and the
boiler plate cleaned over its entire surface..
Dated 14th day of December 1897.
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees and Hull,
Agent for the Applicants.
An Appliance or Tool for Detaching Seale from Boiler Plates.
We, JOHN CLEMENT MINTO, of Wesley Street, West Hartlepool, and WILLIAM
MINTO, of Ashfield Terrace, Stockton-on-Tees, both in the County of Durham,
Engineers, 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 relates to an appliance or apparatus for detaching scale from
boiler plates and is especially applicable in the case of boilers having water spaces
confined by vertical walls of great depth relatively to the cross dimensions of the
enclosed space such as are constructed in marine boilers and which are inaccessible
for the purpose of removing the scale by hammer and chisel.
Hitherto a chisel-ended long bar has been used to detach the scale to a limited
depth beyond which it ceases to be effective owing to the insufficient angle of the
stroke relatively to the surface of the boiler plate and consequently the injurious
practice of hammering the plate on the opposite side has been resorted to for the
purpose of detaching the scale.
The object and result of our invention is to provide an appliance or tool which
impacts a chipping point against the boiler plate surface in any required number
of blows directed at will to any part of the surface to be cleaned and in effect serves
all the purposes of a hammer and chisel in places where a hammer and chisel cannot
be used.
And in order that our invention may be clearly understood and readily carried
into effect, we will proceed to describe the same with reference to the annexed
sheet of drawings, in which Fig. 1 is a side elevation of the apparatus fixed in the
working position between two boiler plates and constructed in accordance with our
invention. Figs. 2 and 3 are enlarged detail views of same.
In the drawing, a represents a hammer plate which may conveniently take the
shape of a sector of a circle, the said hammer plate being pivotally slung at the
point a from which it radiates from a hanger rod b extending down from some
convenient position of support alongside the plate c to be cleaned. An operating
rod d is also pivotally connected to the sector plate a at some intermediate point a
on the upper edge thereof between the centre point a and the rim a³, the said
point of connection affording a suitable leverage for lifting the hammer plate about
its pivot a and thrusting it with the requisite impact against the boiler plate c.
The rim a of the hammer plate is made heavy and terminates with a chipping
point e. We would here remark that the sector form of hammer plate is only to
be taken as a convenient form for illustrating our invention and is representative
of many equivalent forms or modifications by which the like mode of similarly
operating the chipping point can be carried out. In ordinary cases the hanger
bar bis supported from cross bars f mounted on the boiler cross stays g extending
between opposite plates of the water space. Two such cross bars f f held together

page_text: by butterfly screws or set screws h h to grip the boiler stays g g which come between
serve this purpose. A collar i of indiarubber or other equivalent device is made
use of so that the hanger bar b will retain any position to which it is set by
frictional contact only but may be readily adjusted to any other required position
by the use of moderate force. Slotted stays are used as required to steady' the
hanger bar and guide the operating bar d, the stay extending across from its
connection with the hanger bar to the opposite boiler plate c against which it
makes an abutment. This combined stay and guide is adjustable as to its position
by the bolt and nut arrangement to accomodate itself to any distance between the
plates c and c¹ to allow the appliance to be used and the boiler plate cleaned over
its entire surface. In some cases the stay j may be connected to a spiral spring k
furnished at its outer end with a buffer to form an abutment against the boiler
plate and so have a constant tendency to keep the chipping point c of the
hammer plate to its work.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
In a tool or appliance for detaching scale from boiler plates, the particular
arrangement and combination of parts in which a chipping point is impacted
against the boiler plate surface in any required number of blows directed at will
to any part of the surface to be cleaned, substantially in the manner and for the
purpose as hereinbefore described with reference to the accompanying drawing.
T
141
1000
G. J. CLARKSON,
Chartered Patent Agent, Stockton-on-Tees and Hull,
Agent for the Applicants.