AN IMPROVEMENT IN ROCKING FIRE-BARS FOR BOILER OR OTHER FURNACES
Year: 1876

page_text: LETTERS PATENT to John Stephenson, of Dudley Hill, in the County of
York, Engineer, for the Invention of "AN IMPROVEMENT IN ROCKING FIRE-BARS
FOR BOILER OR OTHER FURNACES."
Sealed the 30th September 1876, and dated the 4th April 1876,
PROVISIONAL SPECIFICATION left by the said John Stephenson at the Office
of the Commissioners of Patents on the 4th April 1876.
JOHN STEPHENSON, of Dudley Hill, in the County of York, Engineer.
IMPROVEMENT IN ROCKING FIRE-BARS FOR BOILER OR OTHER FURNACES."
"AN
The object of my Invention is to arrange the surface of rocking bars in such a
manner as to present a uniformly even surface to fire, thus avoiding the projections
hitherto common to this class of bar.
I accomplish my object in the following manner :-I secure dead plates and bar
bearers to the furnaces in the ordinary way, having a number of groves or journals
for the reception of the bars. The bars are formed with a centre plate or web of
deep section. Each of the plates at the top or near to the surfaco is made semi-
circular in order to centre the same in the groves or journals of the dead plates and
bar bearer. A number of tongues are cast on each side of said centre plate or web),
and project at right angles or otherwise from the centre line of centre plate or web.
The tongues on one side of the plate are opposite to the U shaped spaces betwixt the
tongues on the other side of the plate, so that when the bars are placed in the dead
plate, groves, or journals the tongues of one bar will be in the U shaped spaces
betwixt the tongues of the other bar. The whole of the top surface next the fire
will be level when the bars are in their usual position.
The rocking motion is accomplished in the following manner :-In the centre of
the dead plate I attach upon a centre or fulcrum lever a lever, to one end of which
is attached a horizontal plate or connecting bar. This horizontal connecting bar,
having a number of slots or groves at corresponding distances to the centre plate or
web of each bar, is so placed under the dead plate that the bottom portion of the
centre plate or web of bars fits into the respective slots of horizontal connecting
plate; the centre plate or web of each bar thus forms a lever worked by the lateral
notion of the horizontal connecting plate by means of the lever before referred to.
D.
C

page_text: The air spaces are formed by the difference between the area of tongues right and
left of centre web, and forming part of bar and the area of U shaped spaces above
referred to
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Stephenson in the Great Seal Patent Office on the 3rd October
1876.
JOHN STEPHENSON, of Dudley Hill, in the County of York, Engineer. "ÏM-
PROVEMENTS IN ROCKING FIRE-BARS FOR BOILERS OR OTHER FURNACES."
The object of my Invention is to arrange the surface of rocking bars in such a
manner as to present a uniformly even surface to the fire, thus avoiding the pro-
jections hitherto common to this class of bar.
I accomplish my object in the following manner :-1 secure dead plates and bar
bearers to the furnaces in the ordinary way, having a number of grooves or journals
for the reception of the bars. The bars are formed with a centre plate or web of
deep section. Each end of the plate at the top or near to the surface is made semi-
circular in order to centre the same in the grooves or journals of the dead plates
and bar bearers. A number of tongues are cast to each side of said centre plate or
web, and project at right angles or otherwise from the centre line of centre plate or
web. The tongues on one side of the plate are opposite to the U shaped spaces
betwixt the tongues on the other side of the plate, so that when the bars are placed
in the dead plate, grooves, or journals the tongues of one bar will be in the U shaped
spaces betwixt the tongues of the other bar. The whole of the top surface next the
fire will be level when the bars are in their usual position.
The rocking motion is accomplished in the following manner :-In the centre of
the dead plate I attach upon a centre or fulcrum a lever, to one end of which is
attached a horizontal plate or connecting bar. This horizontal connecting bar,
having a number of slots or grooves at corresponding distances to the centre plate
of web of cach bar, is so placed under the dead plate that the bottom portion of
the centre plate or web of bars fits into the respective slots of horizontal con-
necting plate; the centre plate or web of each bar thus forms a lever worked by
the lateral motion of the horizontal connecting plate by incans of the lever before
referred to.
The air spaces are formed by the difference between the area of tongues right and
left of centre web and forming part of bar and the area of U shaped spaces above
referred to.
Having now described the nature of my Invention I will now proceed to describe
the manner in which the same is to be performed, reference being had to the
accompanying Drawings, in which like parts are indicated by like letters and figures.
The Drawings are made to a scale of one and a half inches to one foot.
Fig. 1 is a plan of a fire-box fitted with my improved bars; Fig. 2 is a front
view; Fig. 3 is an inverted plan; Fig. 4 is a section of a fire-bar.
The front dead plate or bar bearer is indicated by the letter A, in which are a
number of journals B for the reception of the ends of the grate bars C; the back
dead plate A¹ has journals B¹ for the reception of the grate bars similar to B; tongues
are cast to the bars C right and left marked C, which fit into the recesses formed by
the tongues of the opposite bars, and leaves suflicient space D between each indi-
vidual bar for the air to pass through. I obtain the rocking motion by means of
lever E secured to the dead plate A by means of pin F, which forms the fulcrum ;
this lever is attached to the horizontal plate G by means of another pin H. Passing
through end of lever E in plate G are a number of grooves J for the reception of
the under web K of the bars C. When a reciprocating motion is given to the
plate C by means of lever E the bars will rock and break up the clinkers, the small

page_text: ashes passing through the spaces D between the bars, by which means the fires are
kept bright and more regular than with the bars in common use.
All the parts of the fire-box not necessary for the elucidation of these improve-
ments are omitted in the Drawings, being the same as any ordinary fire-box.
In witness whereof, I, the said John Stephenson, have hereunto set my hand
and seal, this Second day of October, in the year of our Lord One thousand
eight hundred and seventy-six.
Signed and sealed, in the.
presence of
JOHN WAUGH,
Engineer & Patent Agent,
Bradford,
Yorks.
JOHN STEPHENSON, (L.S.)