IMPROVEMENTS IN THE CONSTRUC- TION OF PORTABLE AND FIXED FORQES."
Year: 1879

page_text: LETTERS PATENT to Herbert Eyre, of South Norwood, in the County of
Surrey, Gentleman, for the Invention of "IMPROVEMENTS IN THE CONSTRUC-
TION OF PORTABLE AND FIXED FORQES."
PROVISIONAL SPECIFICATION left by the said Herbert Eyre at the Office of
the Commissioners of Patents on the 9th January 1879.
HERBERT EYRE, of South Norwood, in the County of Surrey, Gentleman.
"IMPROVEMENTS IN THE CONSTRUCTION OF PORTABLE AND FIXED FORGES."
The object of this Invention is to utilize the waste heat of forge furnaces and to
obtain therefrom a supply of steam sufficient for driving the fan or blower of the
forge, and applicable to that or other purposes.
The Invention admits of various modifications to suit varying circumstances.
As an illustration of the mode of carrying out my improvements, I will suppose
that a portable forge is to be supplied with the Invention. In this case I provide
an L shaped boiler made preferably of welded plates of wrought iron, and this
boiler I so arrange that its inner vertical wall shall constitute the back or twyere
plate of the forge, and the adjoining horizontal plate shall constitute the hearth; thus
there will be a water space both below and at the back of the forge, or at the parts
which are in contact with the ignited fuel.
The twyere pipe will pass transversely through the vertical portion of the boiler
and communicate as usual with the fan or blower. This blower I propose to
actuate by a small rotary or other steam engine attached to one side of the forge
and coupled by a clutch to the fan spindle. By thus connecting the fan spindle
with the engine their disconnection may be readily effected whenever it is found
necessary to work the fan by hand, as for example, at starting the forge fire. A
winch handle and gears should be provided to meet this requirement. The steam
space in the boiler may, if desired, be increased by extending the boiler slightly
over the fire, or by applying to the top of the boiler a tubular steam chamber. In
such case the safety valve will be seated in the tubular extension. In fitting up
fixed forges substantially the same contrivance will be adopted as respects the
boiler, but the arrangement of the engine and fan or blower inust be modified to
suit special circumstances. Where the blast of several forges is obtained from a
common source the steam generated in the forge boilers may be applied to heating
adjacent shops, tanks, or drying chambers.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Herbert Eyre in the Great Seal Patent Office on the 9th July
1879.
HERBERT EYRE, of 2, Egerton Road, Selhurst Park, South Norwood, Gentleman.
"IMPROVEMENTS IN THE CONSTRUCTION OF PORTABLE AND FIXED FORGES."
The object of this Invention is to utilize the waste heat of forge fires, and to
obtain therefrom a supply of steam sufficient for driving the fan or blower of the
forge, and applicable to that or other purposes.
The Invention admits of various modifications to suit varying circumstances.
As an illustration of the mode of carrying out my improvements I will suppose
that a portable forge is to be supplied with the Invention. In this case I provido
an L shaped boiler, made preferably of welded plates of wrought iron, and this
boiler I so arrange that its inner vertical wall shall constitute the back or
tuyere plate of the forge, and the adjoining horizontal plate shall constitute the
hearth; thus, there will be a water space both below and at the back of the forge,
or at the parts which are in contact with the ignited fuel and flames and gases of
combustion proceeding therefrom.
The tuyere pipe will pass transversely through the vertical portion of the boiler
and communicate as usual with tho fan or blower. This blower I propose to
actuate by a small rotary or other steam engine attached to one side of the forge
and coupled by a clutch to the fan spindle. By thus connecting the fan spindle
with the engine their disconnection may be readily effected whenever it is found
necessary to work the fan by hand, as, for example, at starting the forge fire.
A winch handle and gears should be provided to meet this requirement.
The accompanying Drawing illustrates the principle of my Invention and also
the manner of carrying the same into effect. It further shews some modifications
in the construction of the boiler whereby an increased heating surface and steam
space is obtained. Fig. 1 shews in side view the simplest form of forge boiler
which I employ. This boiler is L shaped and from its vertical front wall projects
the nose of the tuyere pipe; Fig. 2 is a side elevation of a similar boiler with a
forward extension of the vertical portion to give additional steam space. In
adapting the forge boiler to the purpose of working the forge fire I have found
it convenient to employ the arrangement shewn at Figures 3 and 4. Fig. 3
shews in back elevation the forge fitted with an oscillating steam engine and a fan
blower for supplying air to the forge; and Fig. 4 is a cross section of the same.
In these Figures A is an L-shaped boiler constituting a water jacket or inner
lining for the forge. The horizontal portion of this boiler forms the hearth and
the vertical portion the back or tuyere plate of the forge from which plate the
tuyere a projects; B is the casing of the forge made of iron in the usual manner
and pierced at the back in a line with the tuyero to provide a passage for the
blast of air from the blower through a tube crossing the boiler to the tuyero.
Over this hole the fan blower C is secured and above the blower is mounted the
oscillating engine D, it being carried by a bracket made fast to the back of the
forge. A band from a pulley on the crank shaft of this engine passes down to
a pulley on the axle of the blower for the purpose of transmitting rotary motion
thereto. In order to provide ample steam space for the boiler A the vertical portion
of the water space is connected by pipes a with a horizontal cylinder A' which is
situato above the fire and within the hood B¹ of the forge. This cylinder is by
preference pierced by flues as indicated by the dotted lines, to permit of the flame
and heated gases passing through as well as around the cylinder. The steam
generated in the water space A will collect in the cylinder A¹, and may be con-
ducted thence to supply the engine. Figures 5 and 6 shew in side and front views
a modified form of the boiler A in which extra steam space is obtained by extending
the vertical portion of the boiler upwards, and the water capacity and the heating

page_text: surface of the boiler are enlarged by a hollow dwarf side wall extension. Figures 7,
8, and 9 shew front, side, and plan views of this same boiler fitted with curved
water circulating tubes a³, a³, which project from the vertical face of the boiler and
provide increased heating surface.
Figures 10 and 11 shew in side and front views the L-shaped boiler fitted with
three horizontal cylindrical extensions A', A², A³, which are connected together by
short necks and to the boiler A by means of pipes a¹, a', which communicate with
the cylinder A¹. These cylinders are so situate that the ascending flames and gases
of combustion will be free to circulate around them. The cylinders may be set in
the flue or chimney of the forge in any convenient manner.
It will be understood that with the before mentioned arrangements safety valves
and the other usual boiler fittings will be employed, their position being determined
by the judgment of the workman.
In adapting the Invention to fixed forges substantially the same contrivance will
be adopted as respects the boiler as has been described, but the arrangement of the
engine and fan or blower must be modified to suit special circumstances. Where
the blast of several forges is obtained from a common source the steam generated in
the forge boilers may be applied to heating adjacent shops, tanks, or drying
chambers, or a trip or other hammer may be worked from the steam generated in
such a combination of boilers or in a singlo boiler when the capacity of the boiler is
sufficient for that purpose.
Having now set forth the nature of my Invention of "Improvements in the
Construction of Portable and Fixed Forges," and explained the manner of carrying
the same into effect, I wish it to be understood that under the above in part
recited Letters Patent I claim, Applying to forges the means above described
for utilizing the waste heat derived therefrom.
In witness whereof, I, the said Herbert Eyre, have hereunto set my hand and
seal, the Ninth day of July, in the year of our Lord One thousand
eight hundred and seventy nine.