An Improved Metal Ring or Wedge Shaped Calking Strip for Calking the Outer Flanges of Steam Boiler Flues or Fire Boxes, and in Machinery for forming such Calking Strip Employed therein.
Year: 1886

page_text: Date of Application, 18th Mar., 1886.
Complete Left, 17th Dec., 1886.
Complete Accepted, 18th Jan., 1887.
An Improved Metal Ring or Wedge Shaped Calking Strip for
Calking the Outer Flanges of Steam Boiler Flues or Fire
Boxes, and in Machinery for forming such Calking Strip
Employed therein.
I, WILLIAM ARNOLD of Victoria Works, Barnsley, Yorkshire, Boiler Maker do
hereby declare the nature of my invention for "AN IMPROVED METAL RING OR WEDGE
SHAPED CALKING STRIP, FOR CALKING THE OUTER FLANGES OF STEAM BOILER FLUES
OR FIRE BOXES, AND IN MACHINERY FOR FORMING SUCH CALKING STRIP EMPLOYED
THEREIN to be as follows:-
"
My invention has reference to means to be employed in "calking" or joining
together the outer flanges of steam boiler flues or fire boxes, which flues or fire boxes
are circular in cross section.
To carry out my invention I employ a ring or hoop of the same, or nearly the same
diameter as the flanges intended to be joined. The metal of which the circular hoop
is formed is made taper or wedge shaped-that is to say-the metal is thinner at the
outer circumference than it is at the inner circumference.
This circular hoop is placed between the two flanges of the flue and in size it is
arranged to reach about the holes where the revits are inserted, or say large enough to
partially cover the said holes, the projecting part however can easily be removed by a
chisel or other instrument so that when the revits are inserted the ring is not rigidly
held, but will be at liberty to expand and contract.
The machine I employ for manufacturing the wedge shaped hoops consists of two
rollers, one plain, and the other grooved to the shape of the metal intended to be
formed.
These rollers are supported by suitable standards, and caused to rotate by suitable
gearing, and the pressure upon the metal passing through them can be regulated by
hand wheel and screws.
The strap of iron to be operated upon is a flat bar which is made hot and passed
between the rollers which give to the said bar its proper shape and curve.
Instead of the "calking" strip being taper it may be of equal thickness.

page_text: hereby declare the nature of my invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
My invention has reference to means to be employed in calking or joining together
the outer flanges of steam boiler flues or fire boxes, which flues or fire boxes are
circular in cross section.
To carry out my invention I employ a ring or hoop of the same or nearly the same
diameter as the flanges to be joined.
The metal of which the circular hoop is formed is made taper or wedge shaped, that
is to say, the metal is thinner at the outer circumference than it is at the inner
circumference.
This circular hoop is placed between the two flanges of the flue and in size it is
arranged to reach about the holes where the rivits are inserted, or say large enough to
partially cover the said holes. The projecting part however can easily be removed by
a chisel or other instrument, so that when the rivits are inserted the ring is not
rigidly held, but will be at liberty to expand and contract; or the ring of metal may
be of the same or nearly the same diameter as the flanges.
The machine I employ for manufacturing the wedged shaped hoops consists of two
rollers one plain and the other grooved, or both rollers can be grooved to the shape of
the metal intended to be formed. These rollers are supported by suitable standards
and caused to rotate by suitable gearing, and the pressure upon the metal passing
through them can be regulated by hand wheel and screws. Instead of the calking
"strip" being taper it may be of equal thickness, but not to protrude through the
outer flanges as in the old method.
In order that my invention may be more clearly understood I herein give reference
to the accompanying sheets of drawings illustrative thereof where Fig. 1. is elevation
of a short length of calking strip, and in Fig. 2. it is shewn in cross section by letter
a in its position in regard to the flue or fire box b. This strip a is made bevil, and it
may be broad enough to reach or nearly reach the outer diameter of the flanges c of
the flue b. If the bevil calking strip is made broad enough as to reach the rivits, the
calking strip may have holes formed in it along its outer circumference as shewn in
Fig. 1. The employment of this bevil calking strip enables me to make a perfect joint
in the flanges forming tubular flues or fire boxes.
The machine I employ for making calking strips is shewn in end view Fig. 3 and
plan view Fig. 4; and consists of suitable frame work or standards A carrying rollers
BC driven by suitable gearing E and-F from driving pulleys G. The roller B is a

page_text: plain one but the roller C is grooved as shewn in the Drawings so that when a hot bar
of iron is passed between the rollers it is formed wedge shaped as will be well
understood, In Fig. 5 I have shewn that the rollers B and C may both be grooved
so that the calking strip is made taper on both sides. H are hand wheels and screws
for regulating the pressure of the rollers B and C upon the 6 metal bar.
The calking strip on leaving the rollers B and C is of course a long narrow wedge
shaped strip, but suitable lengths are cut off and bent into hoops to suit the diameter
of the tube intended to be caulked.
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 :—
Firstly. A metal ring or wedge shaped calking strip for calking the outer flanges
of steam boiler flues, or fire boxes in manner substantially as set forth.
Secondly. The means substantially as herein shewn and described for making
wedge shaped calking strips.