Year: 1886

page_text: We JOHN FREDERICK WRIGHT, and GEORGE ERNEST WRIGHT, both of the firm
of John Wright & Co. Essex Works Thimble Mill Lane Aston in the County, of
Warwick Gas Engineers do hereby declare the nature of our said invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:-
Our invention for improvements in waste heat extractors for gas fires is
intended to meet a largely felt need in open and other gas fires where the heat
escaping into the chimney is certainly a very large proportion of the total calorific
effect of the gas consumed we are therefore able to either reduce the size of the
fires very considerably with an equally good result or otherwise to give a much
greater temperature with the same apparatus and this we accomplish in the
following manner :-
.
In order that our invention may be clearly understood and more easily carried
into practical effect we have appended hereunto two sheets of drawings upon
which is illustrated two modifications thereof which will serve as examples to
enable others to meet the varying necessities of different kinds of fires met with in
ordinary practice as we do not limit ourselves to either the exact design or exact
mode of application thereof as both may be considerably varied.
Figure 1 Sheet 1 is a front elevation of a small gas fire A with the detachable
waste heat extractor B placed at the back thereof.
Figure 2 shews the same parts more clearly in side elevation.
The spigot a which in ordinary enters the chimney in this case enters the lower
chamber of the heat extractor B. From this lower chamber b' rise any number
of vertical spiral, bent or other pipes 6 uniting to the upper box 63 which is pro-
vided with an outlet spigot b' which carries the residuum gases to the chimney or
other outlet. This outlet b may be provided with a baffler, spring or other valve
operated by either the handle cor d.
Figure 3 is a cross section through the lower chamber b¹ of the extractor B
showing the baffler plate 6 which causes the heat to pass through the narrow slit
at the back thereof thus thoroughly distributing it over the whole service and
extent of the tubes.
There may be several horizontal chambers such as b¹ and bª and several sets of
| pipes 6ª but generally two would be the number. These extractors may be made

page_text: either entirely or partly brass, polished steel black or in any design and may be
covered over with an ornamental casing and perforated front sides or top according
to cost.
Figure 4 is a perspective view of a gas fire and heat extractor so designed as to
form practically one when they are placed back to back i.e. the parts E as the front
or gas fire and F as the heat extractor which is also shewn separately in Figure 5
front elevation when detached and Figure 6 side elevation when so detached. The
construction of part E may be that of any ordinary gas fire except when cast or
otherwise constructed as a part of F, we shall therefore only describe the back part
or extractor F as suited to this design. The extractor in this case consists of a
metallic box generally of cast iron in one casting and having any convenient
number of cross tubes K running between the front plate fl and the partition
plate which leaves the space or chamber M in which the residuum gas or heat is
collected before issuing to the chimney or other outlet through the spigot N.
Various forms of the baffle plate W may be provided for distributing the heat
through the tubes K. The action is very simple and the air enters the chamber
at the bottom and rising between the tubes issues through the perforated top
plate into the room without smell,
It will thus be seen that in both the examples herein illustrated and explained
that the air is heated on the outside surface of the tubes while the heat from the
gas fire passes through the inside but it will be readily understood that this may
easily be recovered with a similar effect by making some few alterations construc-
tionally which will be easily understood to those acquainted with the subject.
These extractors may be either cast or wrought iron or other metal and may be
made in many designs.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
what we claim is:-
1st. Improvements in waste heat extractors for gas fires of the detachable
extractor B substantially as and for the purpose herein set forth.
2nd. The improvements in waste heat extractors for gas fires of the extractor F
whether made in one piece with the fire or detachable therofrom substantially as
and for the purpose herein set forth.