IMPROVEMENTS IN NON- CONDUCTING COVERINGS APPLICABLE FOR COVERING STEAM PIPES AND OTHER SURFACES
Year: 1883

page_text: LETTERS PATENT to Alfred Julius Boult of 323 High Holborn in the County
of Middlesex Engineer for an Invention of "IMPROVEMENTS IN NON-
CONDUCTING COVERINGS APPLICABLE FOR COVERING STEAM PIPES AND OTHER
SURFACES a communication from George Kelly Mechanical Engineer, of
Chicago, in the county of Cook and state of Illinois in the United States'
of America
"3
PROVISIONAL SPECIFICATION left by the said Alfred Julius Boult at the
Office of the Commissioners of Patents on the 18th May 1883.
"
ALFRED JULIUS BOULT of 323. High Holborn in the County of Middlesex
Engineer IMPROVEMENTS IN NON-CONDUCTING COVERINGS APPLICABLE FOR
COVERING STEAM PIPES AND OTHER SURFACES." [a communication from George
Kelly Mechanical Engineer, of Chicago, in the county of Cook and state of Illinois
in the United States of America]
This invention relates to certain improvements in that class of non-conducting
coverings for heat or cold conveying pipes or surfaces, and which are known as
"removable coverings '
"
This improvement has for its object; First, to provide an improved enclosing
casing for containing slag cotton, mineral wool, or other analogous, fibrous, non-
conducting material; the construction being such as to admit of the ready removal
or replacement of the completed section of covering upon or around the article to
be covered.
Second, To afford means for securing the abutting ends or edges of the covering
together, when the same is used in such a manner that adjacent ends or edges
meet, and,
Third, To furnish means for readily and cheaply forming an air space between
the covering and the pipe or surface to which it is applied
In this improvement a loose body or mass of mineral wool, slag cotton or

page_text: analogous non-conducting fibrous substance is placed between one or more sheets
of paper, canvas, or other flexible material. Having first made the inner side of
said sheets adhesive by a coating of suitable cement, preferably of soluble glass-
silicate of soda when the two sheets of enclosing material are brought together
over a layer of mineral wool & the same will adhere to the adhesive coating on
said sheets, and be held between the same in a very perfect manner
Where a cover of unusual thickness is required, two or more layers of the
mineral wool etc., are used and in such case the inner sheet of flexible material
will be coated with the adhesive coating on both sides
In manufacturing this improved covering it is preferred to take a single sheet of
paper of more than double the length of the layer of mineral wool etc, and after
applying the adhesive coating to make a small fold of the paper over one end of
the layer of wool and to then fold the paper over the top of the layer of wool thus
forming a complete case to hold the wool. The end of the top layer of paper is
made of sufficient length to extend past the end of the finished covering, and form
an overlap for use in securing the edges of the covering together, when the same
is bent in to a circle, and used as a pipe covering, or to lap joints when the
covering is used on flat or other shaped surfaces.
This mode of construction is especially applicable for forming pipe coverings, in
as much as it leaves a longitudinal opening along the sides of the covering to
permit of its being placed around the pipe. Heretofore in this class of coverings,
it was usual to form such opening by cutting through the covering section, after it
had been completed in a closed state.
In order to produce an air space around a pipe, staples are provided the connecting
bars of which are bent down, so as to form sunken bearing bars. These staples
are driven into the interior surface of the covering so as to form inward projections,
which hold the covering away from the pipe, or other surface covered and thereby
the desired air space between the two is attained; the sunken bearing bars acting
to prevent the staples from being driven too far into the body of the covering.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed.
by the said Alfred Julius Boult in the Great Seal Patent Office on the
17th November 1883.
ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Engineer "IMPROVEMENTS IN NON-CONDUCTING COVERINGS" [sic] a communication
from George Kelly, Mechanical Engineer of Chicago in the County of Cook and
state of Illinois in the United States of America
·
5
This invention relates to certain improvements in that class of non-connecting,
coverings for heat or cold conveying pipes of surfaces and which are known as
"removable coverings'
"
This improvement has for its object. First-To provide an improved enclosing
casing for containing slag cotton, mineral wool, or other analogous, fibrous non-
conducting material; the construction being such as to admit of the ready removal
or replacement of the completed section of covering upon or around the article to
be.covered.
11
Second. To afford means for securing the abutting ends or edges of the covering.
together, when the same is used in such a manner that adjacent ends or edges.
meet, and
Third. To furnish means for readily and cheaply forming an air space between
the covering and the pipe or surface to which it is applied.
These objects are attained by the construction and arrangement of parts
illustrated in the accompanying drawings in which.
Figure 1. is a perspective view of the said improvement adapted for a non-
conducting covering for pipes.
Figure 2. a detail section, showing the preferable mode of forming a "single
layer" sheet of the improved covering.
Figure 3. a detail section of a double layer of the same and
Figure 4. a cross section illustrating the means employed for forming an
space" around a pipe
.
"air
In this improvement, a loose body or mass B, of mineral wool, slag cotton, or
analogous non-conducting, fibrous substance is placed between one or more sheets A
of paper, canvass, or other flexible material. Having first made the inner side of
said sheets adhesive by a coating a of suitable cement, preferably of soluble glass
(silicate of soda) when the two sheets A of enclosing material are brought together
over a layer B of mineral wool etcetera the same will adhere to the adhesive
coating a on said sheets and be held between the same in a very perfect manner.
Where a covering of unusual thickness is required two or more layers B of the
mineral wool etcetera are used, and in such case the inner sheet A of flexible
material will be coated with the adhesive coating a on both sides, as clearly shown
in Figure 3 of drawings.
In manufacturing this improved covering it is preferred to take a single sheet of
paper of more than double the length of the layer of mineral wool etcetera, and
after applying the adhesive coating a to make a small fold a¹ of the paper over one
end of the layer of wool and to then fold at a³ the paper over the top of the layer
of wool, thus forming a complete case to hold the wool as clearly indicated in
Figure 2. The end of the top layer of paper is made of sufficient length to extend
past the end of the finished covering, and form an over-lap a³ for use in securing
the edges of the covering together when the same is bent into a circle and used as
a pipe covering as shown in figure 1. or to lap joints when the covering is used on
flat or other shaped surfaces.

page_text: This mode of construction is especially applicable for forming pipe coverings, in
as much as it leaves a longitudinal opening along the sides of the covering to
permit of its being placed around the pipe. . Heretofore in this class of coverings
it was usual to form such opening by cutting through the covering section, after it
had been completed in a closed state.
In order to produce an air space around a pipe, staples c are provided, the
connecting bars of which are bent down, so as to form sunken bearing bars c'.
These staples are driven into the interior surface of the covering so as to form
inward projections, which hold the covering away from the pipe, or other surface
covered; and thereby the desired air space between the two is attained. The
sunken bearing bars c acting to prevent the staples from being driven too far into
the body of the covering.
7
Having now described the nature of the said invention as communicated to
me by my foreign correspondent, and the manner of performing the same, I
claim
1. In a non-conducting covering the casing A, formed with small fold a¹ and
main fold a substantially as described and for the purpose set forth.
2. In a non-conducting covering the casing A, formed with small fold a¹ main
fold a² and over-lap as substantially as described and for the purpose set forth.
3. The combination with a non-conducting covering of a staple or staples c,
having sunken bearing bars c¹ as described and for the purpose set forth.
In witness whereof I the said Alfred Julius Boult have hereunto set my hand
and seal this fifteenth day of November in the year of our Lord one thousand eight
hundred and eighty three.