other Fibre in the Manufacture of Paper and other Pulp. and to dispense with the lead covered bolt heads inside the boiler
Year: 1886

page_text: other Fibre in the Manufacture of Paper and other Pulp.
I JOSEPH MATTHEW WALTON of Hollincross Lane Glossop in the County of Derby
Mechanic 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 improvements upon an invention for which Letters Patent
were granted to Charles Chesley Springer of Boston Massachusetts in the United
States of America, dated July 3rd A.D. 1885 No. 8073, the object of the present
invention being to provide a more efficient substitute for the "covering strips
mentioned in the Specification of the said Letters Patent and to dispense with the lead
covered bolt heads inside the boiler.
"
The nature of my said invention and the manner in which the same is to be carried
into practical effect will be readily understood on reference to the two sheets of
drawings hereunto annexed and the following explanation thereof.
Fig. 1 on Sheet 1 of the drawings is a longitudinal section of part of a lead lined
boiler constructed according to my said invention. Fig. 2 is a transverse section
across the line A-B in Fig. 1, and Fig. 3 is an internal elevation of the same.
On Sheet 2 of the drawings Fig. 4 is an internal view (partly in section) drawn to
a smaller scale, of one section of a lead lined boiler constructed according to my
invention, and Figs. 5 and 6 are detached views of certain portions hereinafter more
particularly referred to.
According to my invention I make the lead lining a, a of the boiler b, b in sections
as described in the specification previously mentioned, the sections being of such size
and form (see Fig. 4) as to leave an open joint between their edges which I either
pack, or leave open as preferred.
Above or over these joints I lay strips d,d of thin sheet lead or other compressible
and acid-resisting material, these strips being let into each other where the zones cross
so as to break joint as shown at x, x in the detached Figs. 5 and 6, and these strips d, d
are held down by a series of lead-covered cast iron blocks e, e (about one foot long)
which are curved to the form of the inside of the boiler b,b (see Fig. 1) and are laid

page_text: with their ends touching each other so as to form circumferential rings or zones at
right angles to each other (or nearly so) as shown at Fig. 4.
These blocks e,e are made thicker at the centre and gradually chamfered off the ends
and sides (see Figs. 1, 2, and 3).
They are perforated with holes and have a lead covering ex, ex cast thereon which
passes through the perforations and thus unites the front and back parts of the covering.
Each block e, e is bored with a bolt hole in the centre on the side next to the
lining a, a but this hole does not extend through to the other side, reaching only
about two thirds through the cast iron as shown at Figs. 1 and 2.
The hole is tapped with a screw thread and a corresponding hole being formed
through the lead lining a, a, and through the shell b, and sheathing g, y of the boiler.
Each block is secured in its place by means of a screw bolt h, screwed in from the
outside, so that there are neither bolt heads or nuts inside the boiler.
It will be seen that according to my invention there will be no possibility of bulging
or arching up of the covering strips d, d between the bolt holes, and the joints between
the sections a, a will be much more rigid and perfect.
If desired the strips d, d of sheet lead may be dispensed with, but in that case it will
be necessary to make a "blown "joint (that is to say a joint made by the blow pipe)
at the points where the joint between each block e, e crosses the joint between the
sections of the lining a, a.
In cases where the sheet lead covering strip d, d is retained I avoid the necessity for
"blown" joints where one set of rings or zones crosses the other by notching the
rings or strips of sheet lead d, d so as to break joint as previously mentioned and illus-
trated by the detached views 5 and 6.
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 :-
1. In a lead lined boiler wherein the lining is made in sections, the combination
with strips or zones of thin sheet lead covering the joints between the said sections, of
lead covered cast iron blocks placed end to end above such strips and secured in their
places by means of screw bolts screwed in from the outside through the sheathing,
shell, and lead lining of the boiler substantially as hereinbefore described and illustrated
by the drawings annexed.
2. In a lead lined boiler wherein the lining is made in sections the use, (for covering
the joints between and securely holding down the edges of, the said sections) of lead
covered blocks placed end to end and touching each other, such blocks being secured
to the boiler by screw bolts passed in from the outside and not penetrating through
the lead covered blocks, substantially as and for the purposes hereinbefore set forth.
GEORGE DAVIES,
4, St. Ann's Square, Manchester,
Agent for the Applicant.