IMPROVEMENTS IN FURNACE BARS
Year: 1877

page_text: LETTERS PATENT to James Pickup, of Bradford, in the County of York,
Engineer, for the Invention of "IMPROVEMENTS IN FURNACE BARS."
Sealed the 8th September 1877, and dated the 13th March 1877.
PROVISIONAL SPECIFICATION left by the said James Pickup at the Office
of the Commissioners of Patents on the 13th March 1877.
JAMES PICKUP, of Bradford, in the County of York, Engineer. "IMPROVEMENTS
IN FURNACE BARS."
The object of this Invention is by an improved arrangement and combination of
stationary bars or grates, and movable Bars, lifters, or rakes, to break up the fire,
shake out the finer ashes, and keep the air spaces clear and open.
According to one construction I employ a series of grates (by preference, cross-
wise the furnace), the space or openings of which are of such dimentions as to
admit an internal lifting bar, and sufficient space for air passages around the internal
lifting bars.
The lifting motion is given to the internal bars by means of longitudinal excentric
lifting shaft extending along each side of the furnace.
Another construction consists of like cross grates, within the spaces of which are
internal bars, having a rocking or tilting motion on a central axis. The several
internal bars are connected to a draw bar operated when requisite by the attendant ;
the motion of the tilting bars extends to an acute angle on either or both sides of
their axis.
Another construction comprises cross grates as above described, and in connection
therewith is a series of rakes, that is to say, one rake for each cross grate. Each
rake is connected to an axis or rocking shaft, and the latter are operated by a draw
bar, so that when the draw bar is operated the rakes (which when not in use are
below the bars) ascend between the grate spaces, clearing the latter from depositing
clinker, spent fuel, or other obstruction to the passage of air.
Another arrangement consists of bars having a longitudinal central piece or rib,
from which short bars or fingers extend at or about right angles, as described in a
Provisional Specification filed on behalf of John Stephenson and myself, dated
7th April, 1874, No. 1204, Bars, as aforesaid, I arrange across the furnace,

page_text: and connect each alternate grate bar to a draw bar, so that on the latter being
operated a rocking motion will be imparted to the grate bars connected therewith,
⚫the intervening grate bars being stationary. Bars so arranged and operated require
much less power, whilst the reaking up and cleansing the fire from spent fuel and
fine ashes is effectually accomplished, and there is, by reason of the shorter length
of the bars, much less contraction and expansion.
The draw bars applied to the several sets of grate bars, above described, may be
operated by a bell-crank lever, or by an eccentric acting within a slot formed in the
draw bar.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Pickup in the Great Seal Patent Office on the 12th September
1877.
JAMES PICKUP, of Bradford, in the County of York, Engineer.
IN FURNACE BARS."
"IMPROVEMENTS
The object of this Invention is by an improved arrangement and combination of
stationary bars or grates, and moveable bars, lifters, or rakes, to break up the fire,
shake out the finer ashes, and keep the air spaces clear and open.
According to one construction I employ a series of grates (by preference, cross-
wise the furnace), the space or openings of which are of such dimensions as to
admit an internal lifting bar, and sufficient space for air passages around the internal
lifting bars.
The lifting motion is given to the internal bars, by means of longitudinal eccentric
lifting shafts extending along each side of the furnace.
Another construction consists of like cross grates, within the spaces of which are
internal bars, having a rocking or tilting motion on a central axis. The several.
internal bars are connected to a draw bar operated when requisite by the attendant;
the motion of the tilting bars extends to an acute angle on either or both sides of
their axis.
Another construction comprises cross grates as above described, and in connection
therewith is a series of rakes, that is to say, one rake for each cross grate. Each
rake is connected to an axis or rocking shaft, and the latter are operated by a draw
bar, so that when the draw bar is operated the rakes (which when not in use are
below the bars) ascend between the grate spaces, clearing the latter from depositing
clinker, spent fuel, or other obstruction to the passage of air.
Another arrangement consists of bars having a longitudinal central piece or rib,
from which short bars or fingers extend at or about right angles, as described in a
Provisional Specification filed on behalf of John Stephenson and myself, dated
Seventh April, One thousand eight hundred and seventy-four, Number 1204. Bars,
as aforesaid, I arrange across the furnace, and connect each alternate grate bar to a
draw bar, so that on the latter being operated a rocking motion will be imparted to
the grate bars connected therewith, the intervening grate bars being stationary.
Bars so arranged and operated require much less power, whilst the raking up
and cleansing the fire from spent fuel and fine ashes is effectually accomplished,
and there is, by reason of the shorter length of the bars, much less contraction and
expansion.
The draw bars applied to the several sets of grate bars, above described, may be
operated by a bell-crank lever, or by an eccentric acting within a slot formed in the
draw bar.
Such being the nature and object of this my said Invention, I will now proceed
to describe in detail the several plans or modifications described under headings one
to four in Provisional Specification filed on my behalf; the description will be fully
understood on reference to the Drawings hereto annexed.

page_text: According to the construction of furnace bars herein referred to, Fig. 1 is a plan
view, Fig. 2a side elevation in section, Fig. 3 front view, Fig. + a section of
internal lifting bars A and stationary bars B, air passages C. The lifting motion is
given to the internal bars A by means of the longitudinal excentric shafts D, D¹,
extending along each side of the furnace, the shafts being connected by means of
the links E, E, so that on partial rotation (by handsweep or other power) being
imparted to the shaft D the links E and shaft D' give a rising and falling motion
to the internal bars A, thus lifting and breaking up the fire and cleansing the bottom
of the firo from fine ashes or other obstruction to the free entrance of air.
Figs. 5, 6, 7, 8 are plan, elevation in section, cross section, and detail of like con-
struction of cross grates, the internal bars A being rocking or tilting bars; B, the
stationary bars or grates, the motion being imparted to the bar A by means of
the draw bar D connecting the axial rib E, to which the several bars A of each
set are attached.
At Figs. 9, 10, and 11 is plan view, elevation in section, and cross section of cross
grids or gratos B, having internal rakes A connected with and operated by a draw
bar D.
Figs. 12, 13, and 14 are plan, elevation in section, front view, and detail of bar,
consisting of longitudinal central piece or rib A, from which short fingers B extend
at about right angles. Each alternate bar is connected with the draw bar D, so
that on the latter being operated a rocking motion will be imparted to the grate
bars connected therewith, the fingers B passing (during rocking) to and fro within
or between the fingers B, B, of the stationary bars, so ensuring, through breaking
up of the fire, removal of fine ashes and a free passage way for air.
The draw bars applied to the several sets of grate bars, above described, may be
operated by a bell-crank lever H, or by an eccentric acting within a slot formed in
the draw bar.
At Fig. 15 two draw bars D, D, are employed, one of which is connected to each
alternate bar 1, 3, 5, 7, the other draw bar being connected to the bars 2, 4, 6, so
that on removing the pin m from T head lever first one half of the bars may be
rocked, then replacing pin m and removing pin n, the bars 2, 4, 6, or second half
may be rocked, the fire being thus from time to time broken up from end to end of
the furnace.
"
The several grates, stationary and moveable, are placed across the furnace, so ns
to reduce length of bar (and contraction of same) to a minimum.
Having thus fully described the nature and particulars of this my said Invention,
together with the manner in which the same is to be or may be performed, I would
have it understood that I lay no claim separately or per se to rocking bars, as such
are not new, but what I do claim is, the combination of cross rocking bars and
stationary bars, constructed and applied as described, and operated in the manner
and by the means herein fully described and illustrated.
In witness whereof, I, the said James Pickup, have hereunto set my hand and
seal, this Fourth day of September, in the year of our Lord One thousand
eight hundred and seventy-seven.
Witness,
WALTER BRIERLEY,
Patent Agent,
Halifax & Blackburn.
JAMES PICKUP. (L.S.)