IMPROVEMENTS IN AP- PLIANCES CONNECTED WITH FURNACES
Year: 1877

page_text: LETTERS PATENT to Michael Holroyd Smith, of Halifax, in the County of
York, Wire Manufacturer, for the Invention of "IMPROVEMENTS IN AP-
PLIANCES CONNECTED WITH FURNACES."
ealed the 8th September 1877, and dated the 10th March 1877.
PROVISIONAL SPECIFICATION left by the said Michael Holroyd Smith at
the Office of the Commissioners of Patents on the 10th March 1877.
MICHAEL HOLROYD SMITH, of Halifax, in the County of York, Wire Manu-
facturer. "IMPROVEMENTS IN APPLIANCES CONNECTED WITH FURNACES."
This Invention relates to improved appliances to be used in conjunction with
apparatus connected with furnaces, for which Letters Patent, No. 170, dated 15th
January, 1876, were granted to me, and applicable to furnaces generally.
The Invention comprises,―
Firstly. Apparatus for imparting intermittent reciprocating motion to the bars
of furnaces, such motion being for the purpose of breaking up and for moving
forward the fuel, as well understood.
Secondly. The Invention relates to improved appliances for operating the
supplementary or auxiliary back grids or grates (placed off the ends of the furnace
bars) so as to remove the spent fuel or ashes therefrom.
Thirdly. To improved furnace bars I connect each alternate bar of the furnace
with or to a cross "draw bar;" the remaining furnace bars are connected to a
second "draw bar." The two draw bars are attached to levers or links, operated by
a double tappet, or by tappots, cranks, or other equivalent, so that when the outer
draw bar is pulled, the several furnace bars connected therewith will be drawn
outwards; the second draw bar being so operated will draw outwards the remaining
furnace bars; on the return "throw," a motion of the tappet or crank, the two draw
bars and the whole of the furnace bars will be moved inwards to their original
position, the motions being repeated at each revolution of the tappet, tappets, or
crank motion.
The supplementary or auxiliary grids or grates, of which (by preference) I employ
two, are each provided with an axis on which they are free to turn or tilt. An
arm set at an angle extends from the under side of each grid or grate, and the two
[Pavice d

page_text: arms are connected by a link or bar, to which is attached a rod extending along the
flue to the front of the boiler, so that the attendant inay when the fuel on the grids
or grates is exhausted, tilt them, and thereby remove the spent fuel or ashes
therefrom.
The improved bars consist of plates of the form of an equilateral triangle mounted
upon a central axis; by a partial rotation of the axis a new bearing or grate
surface for the fire is provided. Where more than one set of such plates is
to be used in one furnace the plates or bars may be one within another.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Michael Holroyd Smith in the Great Seal Patent Office on the
10th September 1877.
MICHAEL HOLROYD SMITH, of Halifax, in the County of York, Wire Manufacturer,
"IMPROVEMENTS IN APPARATUS CONNECTED WITH FURNACES."
This Invention relates to improved appliances to be used in connection with
apparatus connected with furnaces (for which Letters Patent, Number 170, dated
Fifteenth January, One thousand eight hundred and seventy-six, were granted to
me), and applicable to furnaces generally.
The Invention comprises,―
Firstly. Apparatus for imparting intermittent reciprocating motion to be bars of
furnaces, such motion being for the purpose of breaking up and for moving forward
the fuel, as understood.
Secondly. The Invention relates to improved appliances for operating the suple-
mentary or auxilliary back grids or grates (placed off the ends of the furnace bars)
so as to remove the spent fuel or ashes therefrom.
Thirdly. To improved furnace bars I connect each alternate bar of the furnace with
or to a cross" draw bar;" the remaining furnace bars are connected to a second" draw
bar." The two draw bars are attached to levers or liuks operated by a double tappet,
or by tappets, cranks, or other equivalent, so that when the outer draw bar is pulled,
the several furnace bars connected therewith will be drawn outwards; the second
draw bar being so operated will draw outwards the remaining furnace bars; on the
return "throw," or motion of the tappet or crank, the two draw bars and the whole
of the furnace bars will be moved inwards to their original position, the motions
being separated at each revolution of the tappet, tappets, or crank motion.
The supplementary or auxilliary grids or grates, of which (by preference) I employ
two, are each provided with an axis, on which they are free to turn or tilt. An arm,
set at an angle, extends from the under side of each grid or grate, and the two arms
are connected by a link or bar, to which is attached a rod extending along the flue
to the front of the boiler, so that the attendant may, when the fuel on the grids or
grates is exhausted, tilt them, and thereby remove the spent fuel or ashes there-
from.
The improved bars consist of plates of the form of an equilateral triangle mounted
upon a central axis; by a partial rotation of the axis a new bearing or grate surface
for the fire is provided. Where more than one set of plates is to be used in one
furnace the plates or bars may be one within another.
Such being the nature and object of this my said Invention, I will now proceed
to describe the same in detail, and in order that the Invention may be fully
understood, I have hereunto annexed two Sheets of Drawings, and have marked the
several views or Figures with letters of reference, the same letter referring to the
same part in the several views.

page_text: bars A and D are attached to the cam levers C, D, operated by the cams E, F, on
the shaft G, the latter receiving motion from the ratchet wheel H, worked by lever
and catch J, this lever being rocked by the eccentric pin or stud K at the end of the
first motion shaft L. M, N, are the driving pulleys.
At Figs. 3 and 4 pinions and racks are shown for imparting the required motion
of the bars C and D, being actuated by cam, as at Fig. 1, or by crank, or eccentric,
or by draw rod D¹, there being one of such rods D₁ to operate each half of the
furnace bars, so that motion, given to one fire-bar, works its shaft A¹ or B¹, and the
several intervening bars connected therewith.
At Figs. 5 and 6, the cross draw bar A moves by tappet or crank transversely,
and the cams C, D, thereof, by means of the cross heads c swivelling in the pin d,
and acting upon the lugs attached to the furnace bars, give the required motion
thereto.
At Fig. 7 the draw bar A, operated by tappet, as before described, moves
the furnace bars 1, 2, by means of the diaginal slots X, X, and pins Y. The
supplementary or auxilliary grid or grato P, P, Figs. 1 and 2, are mounted upon
axles 7, on which they may be turned or tilted, the arm or angle picces S extend
from the under side of each grid, and is connected to the link or bar w, w¹; x is a
rod extending along the flue to the front of the boiler, and such rod is attached to
the hand lever Z. When the lever Z is moved to the position shewn by dotted
lines, the auxilliary grids P, P, are tilted into the position shewn by dotted lines,
and the spent fuel and ashes therein is tilted into the fluo ready for removal.
At Figs. 8 and 9 the equilateral triangular plates S are shewn mounted on a
cross rod or shaft T; when one surface is burnt another surface can be turned
upwards, and such movement may be employed when required for breaking up the
fire or for cleaning the surface last in use.
Having thus described the nature and particulars of this my said Invention,
together with the manner in which the same may be performed or carried into
practice, I would have it understood that I limit my clain to,-
Firstly. The combination of the draw bars and mechanism connected therewith,
as shewn and described.
Secondly. The apparatus for operating the supplementary or auxiliary bars, as
and for the purpose described.
Thirdly. The construction of furnace bars shown at Fig. 8 and 9, and as herein
described.
In witness whereof, I, the said Michael Holroyd Smith have hereunto set
my hand and seal, this Sixth day of September, in the year of our Lord
One thousand night hundred and soventy seven
Witness,
WALTER BRIERLY,
Patent Agent,
Halifax & Blackburn.
M. HOLROYD SMITH. (L.S.)