Improvements in Heat Non-conducting Coverings and Mode of Manufacture.
Year: 1899

page_text: Date of Application, 27th July, 1899
Complete Specification Left, 2nd Apr., 1900-Accepted, 12th May, 1900
PROVISIONAL SPECIFICATION.
Improvements in Heat Non-conducting Coverings and Mode of
Manufacture.
I, JOHN MLAY, of 10, Mexfield Road, Putney, in the County of London, do
hereby declare the nature of this invention to be as follows:-
The object of my invention is to produce a light non-charable covering for the
prevention of the radiation of heat from steam pipes, and other vessels and
applicable also to refrigerators and cold water pipes and which covering can be
easily applied and also casily removed and replaced. The substances which I
use are by preference asbestos in the form of papier maché or vegetable sub-
stance first rendered incombustible by chemical treatment. It is well known
that the best known non-conductor of heat is a confined air space but hitherto
great difficulty has been experienced in making covering tubes of a uniform
size and shape for the distance pieces or ribs to form the air spaces have been
placed inside the tube and the tendency of this arrangement is to alter the shape
of the tube when being dried. Now my invention is to obviate this difficulty,
and for that purpose I form my air spaces by diminishing the inside diameter
of the tube at one of its ends to the size of the pipe to be covered and thereby
forming a tube with a regular and uniform air space when the undiminished end
of one tube is placed over the diminished end of the other.
My mode of manufacture is the using of a mould having within it a mandril on
which there is a loose sleeve. This mould I fill with my heat non-conducting
material which by means of a piston actuated by a screw or other power I press
to the required shape.
Dotad this Orth day of IT.... 1900
Improvements in Heat Non-conducting Coverings and Mode of
Manufacture.
I, JOHN MCLAY, of 10, Mexfield Road, Putney, in the County of London, 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:-
The object of my invention is to produce a light non charable covering for the
prevention of the radiation of heat from steam pipes and other vessels and
applicable also to refrigerators and cold water pipes and which covering can be
applied and also easily removed and replaced. The substances which I

page_text: use are by preference asbestos in the form of papier mâché or vegetable sub-
stances first rendered incombustible by chemical treatment. It is well known
that the best non-conductor of heat is a confined air space but hitherto
great difficulty has been experienced in making tubes of uniform
size and shape for the distance pieces or ribs to form the air space have been
placed inside the tube and the tendency of this arrangement is to alter the shape
of the tube when being dried.
Now my invention is to obviate this difficulty and for that purpose I form my
air spaces by diminishing the dimeter of the tube at one of its ends to the size
of the pipe to be covered and thereby forming a tube with a regular and uniform
air space when the undiminished end of one tube is placed over the diminished
end of the other as shown on drawing Figure 1.
My mode of manufacture is the using of a mould Figure 2a having a mandril
Figure 2 on which there is a loose slieve Figure 2 c. This mould I fill with
my heat non-conducting material which by means of a piston Figure 2 d shaped
to form the ends of the tubes and actuated by a screw or other power I press to
the required shape.
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:-
The form of air space in non-heat conducting covering tubes as described and
shown on drawing and the mode also therein shown and described of manu-
facturing the same.