Improvements in Heat Retaining Jackets or Coverings for Boilers, Steam Pipes, and the like.
Year: 1891

page_text: Date of Application, 3rd Dec., 1891
Complete Specification Left, 23rd Aug., 1892--Accepted, 8th Oct., 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by GEORGES HAYES, of 71, Eighth Avenue, in the
City, County, and State of New York, United States of America, Civil and
Mechanical Engineer.]
Improvements in Heat Retaining Jackets or Coverings for Boilers,
Steam Pipes, and the like.
1, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
My invention relates to appliances such as jackets, coverings or casings for heat
generating and water-heating apparatus as boilers furnaces pipes for conveying
hot water steam and the like and for other purposes where it is desirable to retain
or confine heat and prevent radiation thereof from the exterior surface.
The said invention consists of a jacket or casing of sheet fireproof material such
as for instance, sheet iron or other sheet metal covered over the external surface
of the apparatus in which it is desirable to retain heat and prevent escape of the
same by radiation therefrom. The jacket is sustained at sufficient distance from
the shell which it covers as to furnish an air space between the two, by suitable
supports at intervals and the external face of the jacket is coated with a nou-
conducting coating of more or less fireproof nature. It also consists of the
combination of an apertured sheet metal jacket with a heat producing or heat con-
veying apparatus such as a boiler, heater, furnace or the like. The jacket
enclosing an air chamber or space between itself and the shell of the article covered
thereby. And the exterior surface of the jacket is covered with a non-conducting
coating or composition of more or less fireproof nature held thereto by means of
the apertures through the surface of the sheet-metal into which the coating keys.
It further consists of the combination of an apertured sheet-metal jacket or
casing with the external shell of a heat producing or heat conveying apparatus,
the edge-metal of the apertures formed in the jacket being turned outwardly to
form tongues, books or barbs whereby an outside coating of non-conducting and
non-combustible material or composition may be secured thereto.
It further consists of the combination of a sectional sheet-metal jacket or casing
with the shell or exterior surface of a boiler or other heat producing apparatus or
conveyor, each section provided with an upturned flange and formed to fit each
other so as to be readily and securely united and disunited for removal when
desirable for repairs and the like.
The invention further consists of a sectional block for use in jacketing boilers
and like apparatus to prevent radiation therefrom the said block being formed of
sheet-metal apertured at short intervals throughout, the edge-metal of the
apertures being turned outwardly and forming tongues or barbs, and the surface of
the block coated with a non-conducting fireproof composition as external facing,
the sheet-metal also formed with backwardly projecting ribs or points of its metal
which by impinging upon the shell of the heating apparatus will sustain the sheet
retaining portion of the jacket at a suitable distance from the face of the shell so
as to leave ar. air space between the two. And the sheet-metal block also formed
with side flanges projecting. forwardly to facilitate union with its neighbour by
rivets or other fastenings so that any block of the set around the apparatus may
be readily removed when desired for testing the boiler, securing leaky rivets and
other repairs and then replaced with security. The peculiar features of this
invention are first the construction of the jackets in sections and their union in

page_text: such a manner that any one section may be removed and replaced at will without
injury to the adjacent sections.
Secondly-the formation, of an air chamber or space between the jacket and the
shell of the apparatus covered thereby.
Thirdly the construction of the blocks individually of sheet-metal coated with
non-conducting non-absorbent fireproof material or composition.
Fourthly the construction of the blocks in such a manner that only small
portions or points of the sheet-metal are in contact with the shell of the apparatus
covered thereby.
Dated this 3rd day of December 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Heat Retaining Jackets or Coverings for Boilers,
Steam Pipes, and the like.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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:
My invention relates to appliances such as jackets, coverings or casings placed
upon or around heat generating and water heating apparatus as boilers, furnaces,
pipes for conveying hot water, steam etc., and others wherein it is desirable to
retain or confine heat and prevent its radiation from the exterior surface, and my
invention consists of a jacket formation or casing of sheet-metal covered over the
external surface of the boiler or other apparatus in which it is desirable to retain
heat and prevent radiation. The jacket sustained at sufficient distance from the
surface of the apparatus as to furnish dead-air space between the two-by suitable
supports at intervals as bends of the metal or points thereof-and the external
surface of the jacket coated with a non-conducting material or composition. of more
or less fireproof nature.
It also consists of the combination of a sheet-metal jacket, the metal of, which is
perforated or otherwise apertured at intervals throughout, with a heat producing
or heat conveying apparatus as boiler, heater, pipes etc., the jacket confining a
dead air chamber or space between itself and the shell of the apparatus covered
thereby, and the exterior surface of the jacket covered with a non-conducting,
material or composition of more or less fireproof nature,, held thereto by means of
the apertures through the sheet-metal into which the coatings "keys."
It further consists of the combination of a sheet-metal jacket or casing, apertured
at intervals throughout, with the external shell of a heat, producing or heat,con-
veying apparatus-the edge metal of the apertures in the jacket turned outwardly
to stand as tongues, hooks or barbs whereby an outside coating, of noneonducting
and 'noncombustable material or composition is secured thereto.
It further consists of the combination of a sectional sheet-metal jacket.or..casing
with the shell or exterior surface of a boiler or other heat producing, apparatus, or
conveyor, each section formed with an upturned and outwardly, projecting, flange
and' each formed to fit each other, and secured together by rivets or other, suitable.
means in connection with the abutting flanges so as to be readily united, and dis-
united for removal and replacement when desirable. for repairs, examinations &c...
It further consists of a sectional block for use in jacketting boilers and. like
apparatus as an article of manufacture and commerce, to be applied. as. a. preventa-
tive against radiation of heat-the. said block formed of sheet-metal apertured at:
near intervals throughout, the edge-metal of the apertures turned outwardly, and

page_text: standing as tongues or ouros aun the surface of the block coated with a non-
combustable fireproof composition as external facing-the sheet-metal also formed
with backwardly projecting ribs or points of its metal which by impinging upon
the shell of the apparatus covered will sustain the sheet-remaining portion of the
jacket block at suitable distance from the face of the shell of the apparatus as to
leave a dead air space between the two-and the sheet-metal block also formed
with side flanges projecting forwardly to facilitate union with other blocks of like
character by rivets or other suitable fastenings so that any block of a set around
a boiler or heating apparatus may be readily removed when desirable for testing
boiler, securing leaky rivets and other repairs, then replaced in security.
The special features of construction, combination of parts and application of
the invention to use may be seen by reference to the accompanying drawings
in which-
Figure 1, represents, in perspective, a boiler to which my newly devised jacket
or casing is applied.
Figure 2, represents a cross section of the same.
Figures 3 and 4, represent face views of the sheet-metal perforated at intervals.
Figure 5, is a sectional view of a piece of sheet metal with a punctured aperture
and tongues turned out.
Figures 6 and 7, represent face views of the sheet-metal apertured at intervals,
the edge metal of the apertures turned outwardly and standing as tongues,
or barbs.
Figure 8, represents in perspective a piece of boiler or furnace shell with portion
of jacket of sheet-metal formed with backwardly projecting ribs impinging upon
the shell, with dead air space between--the sheet-metal also formed with tongued
apertures and partly covered with exterior coating or facing of composition-this
view also shows the manner of joining two sections, or sectional blocks of the
jacket by rivets through their abutting side flanges projecting forwardly beyond
the face of the coating or exterior facing.
Figure 9 is a cross section of jacket metal showing circular or rounded ribs, and
manner of joining sections.
Dotted lines show face of boiler shell and above the jacket face line of coating.
Figure 10, is a similar section showing another formation of ribs.
Figure 11, is a perspective view of a piece of boiler shell with portion of jacket
applied thereto illustrating a manner of cutting and forming the sustaining ribs
whereby the jacket may be supported on the shell by small points of the ribs
impinging thereon.
Figure 12, is a perspective view of a piece of the sheet-inetal jacket showing a
manner of obtaining small points by cutting through at intervals and turning
backward a tongue of the metal to impinge upon the boiler shell.
On the drawings A, indicates the shell or surface exterior of the apparatus as
steam boiler, hot water or hot air heater, furnace, conveying pipes for hot water
or steam etc. As my invention is applicable wherever it is desirable to retain heat
and prevent radiation from the exterior surface of any heating-heat producing
or conveying apparatus. B, indicates a covering after the manner of a jacket or
casing, in shape conforming to that of the apparatus covered-curving or other-
wise. This jacket or casing I form of sheet-metal usually black iron, but when
desirable it may be dipped, painted or galvanized. I also avail myself of other
sheet-metal, or material, when suitable and deemed desirable.
I form the sheet of metal with backwardly projecting bends, folds, or ribs as
at A, (several ways being shown essentially alike), which extending lengthwise the
sheet and located at suitable distance apart give the sheet sufficient strength and
rigidity to adapt it for its uses, such ribs also constitute means whereby the sheet-
remaining portion of the metal will be kept from contact with the shell of the
object encased, as the only part of the jacket or casing touching the object or
apparatus is the extreme edge or rearward-most part of the ribs.
It will be seen by reference to Figs. 1, 2, 8, 9, 10 and 11 at C, that a dead air

page_text: space is thus enclosed between the jacket and shell of the apparatus when the ends
are closed, such dead air space is in itself a preventative against radiation of heat
from the apparatus, to secure this space is one of the most important objects and
results of my invention. I use sheets of metal of full merchantable length and
whenever necessary join others by lapping the ends and rivetting-thus extending
lengthwise.
As to width, I form of such widths of metal as I find suitable and convenient
and join side by side sections of jacket as shown at B, Figs. 1, 2, 8, 9 and 10, a
turned up flange at the sides of each section abutting and two such united by
rivets C, thus forming a complete jacket or casing of as many sections as desirable,
thus also providing for the ready removal of any section desirable to admit of
reaching the shell of the apparatus from outside, for examination, hammer test,
securing leaky rivets or repairs generally when needed. At D, is shown an outer
coating or facing of a non absorbent and non combustable material or composition,
it may be of asbestos, or of composition of which asbestos is a part, or it may be
of any such coatings as have heretofore been applied to boiler surfaces. When
such coatings have been applied direct to boiler surfaces it has been necessary to
spread the substance to great thickness, even sometimes to three inches or more-
but by means of my jacket sustained as it is at a distance from the boiler surface
or shell the exterior coating laid upon the jacket may be reduced in thickness
down to even less than half an inch-thereby also reducing weight and expense-
such coatings will readily adhere to the jacket surface and with more tenacity than
to a boiler surface, but to enable a coating to adhere with immovable tenacity and
also to facilitate the employment of a less expensive material or composition I,
when so desirable, puncture-perforate, or otherwise form my sheet-metal with
apertures at intervals throughout as shown in Figs. 3 to 8-not confining myself
to any particular form of opening-round-oblong, or polygonal and preferably
with the edge-metal of the punctures or cuts turned outwardly, to stand beyond
the exterior face of the jacket as shown at D, Figs. 5, 6 and 7, which projections
of metal constitute tongues, hooks or barbs, and which become embedded in the
coating and serve to hold it more securely-the apertures also aid in securing
it as the coating sets into the same "keying" thereto; by thus forming my jacket
or casing I am enabled to coat the exterior surface with a comparatively
inexpensive material-conimon lime mortar or plaster serving as well as the more
expensive coatings and I attain my purpose without adding so materially to the
weight of the apparatus covered.
As it is desirable that the least quantity of jacket metal should touch the
boiler, etc. I sometimes cut away portions of metal from the ribs leaving them as
shown at E, Fig. 11, so that only points of the ribs come in contact with the boiler
shell I also for the same purpose sometimes form points by cutting the sheet at
intervals and turning the metal tongue backwardly as shown at F, Fig. 12.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondent I declare that what I claim is :-
First. A heat retaining jacket or casing enclosing a heat producing apparatus
or conveyor, sustained at a suitable distance therefrom by reduced portions thereof
and confining between itself and the shell of the apparatus covered-a dead air
space essentially as herein set forth.
Second. A sheet-metal jacket or casing in combination with the shell of a heat
producing apparatus or conveyor-sustained at a distance from the shell aforesaid
by portions of its metal and confining between its back surface and said shell a
dead air chamber or space essentially as herein set forth.
Third. A covering for boilers and the like, formed of sheet-metal held at
sufficient distance from the exterior surface of the boiler shell by metal supports
as ribs or points and having over its exterior surface a layer of nonconducting fire-
proof material essentially as set forth.

page_text: Fourth. A covering for boilers and the like, formed of sheet-metal raised from
the boiler shell by backwardly extending ribs integral with the sheet-metal jacket
or casing and having its external face overlaid with a nonconducting fireproof
coating essentially as set forth.
Fifth. A jacket for boilers and the like, of sheet-metal formed with backwardly
projecting ribs and having its sheet remaining portion perforated at intervals
throughout and its exterior face overlaid with a nonconducting fireproof coating
essentially as set forth.
Sixth. A jacket for boilers and the like, of sheet-metal formed with backwardly
projecting ribs and its sheet remaining portion formed with punctured apertures at
intervals throughout with the edge metal of the apertures turned outwards and
standing as tongues or barbs and its exterior face overlaid with a nonconducting
fireproof coating essentially as set forth.
Seventh. The combination of boiler shell A, raised jacket B, supports C, and
dead air space D, essentially as set forth.
Eighth. A sectional block for jacketting boilers and the like, formed of
apertured and tongued sheet-metal having backwardly projecting ribs as supports
and at each side a forwardly projecting flange to facilitate union with other
blocks of like character by rivets or other fastenings and having its exterior
surface overlaid with a nonconducting fireproof coating essentially as set forth.
Ninth. A sectional jacket for boilers and the like, of apertured and tongued
sheet-metal, formed with backwardly extending ribs or points for supporting the
sheet remaining portion at a distance from the shell covered, thereby providing a
dead air space between the two-and each section formed with forwardly projecting
side flanges and the set secured together by rivets through their respective flanges,
(or other suitable fastenings) and the exterior surface of the jacket overlaid with
a nonconducting fireproof coating essentially as shown and described.
Dated this 23rd day of August 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.