IMPROVEMENTS IN GRATE BARS
Year: 1872

page_text: LETTERS PATENT to James Pickup, of Bradford, in the County of
York, Engineer, for the Invention of "IMPROVEMENTS IN GRATE BARS."
PROVISIONAL SPECIFICATION left by the said James Pickup at the
Office of the Commissioners of Patents, with his Petition, on the
2nd December 1872.
I, JAMES PICKUP, of Bradford, in the County of York, Engineer,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN GRATE BARS," to be as follows:→
This Invention relates to further improvements in grate bars, for
which Letters Patent were granted to the present applicant, and dated
May 28th, 1872, No. 1617. In the Specification referred to I have
described the use of a frame or support for the grate bars.
My Invention relates

page_text: received on or in the rabbet or recessed end of the "dead plate," so as to
admit the said grate bars being placed close to and in contact with the
said dead plate. Or the top of the frame may be level with the lower
part of the rabbet of the dead plate, and the bar may overlap or cross
the joint of the two and be level with the top of the dead plate. In case
there is no rabbet on the dead plate, the end of the bars are brought
close to the dead plate, and the frame is supported by ordinary cross
bearers and so protecting the frame from injury by the fire, and securing
greater area or fire surface, and likewise obviating projection of the
grate bars above the level of the dead plate.
Secondly. In the construction of grate bars I employ parallel side
longitudinal bars, but dispense with the connecting bars, and employ in
lieu thereof a fretwork formed by leaving hexagonal openings or other
like figures, but I prefer the hexagonal figure, because it gives the
greatest area of air passages and is the lightest, requiring less metal than
and other figures, and yet is of great strength. Grate bars of the construc-
tion described may be made in one length, or in a series of short lengths or
blocks, as described in the Specification of the Patent herein-before
referred to.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Pickup, in the Great Seal Patent Office
on the 31st May 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
PICKUP, of Bradford, in the County of York, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of December, in the year
of our Lord One thousand eight hundred and seventy-two, in the thirty-
sixth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said James Pickup, Her special licence that I,
the said James Pickup, my executors, administrators, and assigns, or
such others as I, the said James Pickup, my executors, administrators,
and assigns, should at any time agree with, and no others, from time to
time and at all times thercafter during the term therein expressed,

page_text: greatest area of air passages and is the lightest, requiring less metal than
other figures, and yet is of great strength. Grate bars of the construction
described may be made in one length, or in a series of short lengths or
blocks, as described in the Specification of the Patent herein-before
referred
In order that this Invention may be clearly understood, I have here-
unto. annexed a Sheet of Drawings and have marked the same with
figures and letters of reference.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a plan view of the frame or support for the grate bars.
Fig. 2' is a side elevation in section of Fig. 1 with grate bar in
position, the latter being also in section. Fig. 3 is a plan view of three
of my improved hexagonal bars. Fig. 4 is a longitudinal view of a
grate bar constructed according to this Invention.
A, A, are the longitudinal bars of the frame, B is the lip or projection
thereon which rests on the ordinary dead plate, or the top of the frame
may be level with the lower part of the rabbet of the dead plate, and the
bar C may overlap or cross the joints of the frame and dead plate, and
thus be level with the latter. Should however there be no rabbet on
the dead plate the end of the bars C are to be brought close to the dead
plate and the frames A, A, will be supported by ordinary cross bearers,
and so protect the frames from injury by the fire, and securing greater
area or fire surface, and likewise obviating projection of the grate bars
above the level of the dead plate. The projection E on the end of the
bars rests on the lip or incline B and admits of freedom of expansion
and contraction, the bars being free to move on its projection E on the
said lip. C is the hexagonal bars, shewn clearly at Fig. 3, which is plan
view of three longitudinal bars side by side; the same construction of
bar in a short length or "block bar" is shewn clearly at C, Fig. 1, on
the frame A. It will be seen that each of the bars in Fig. 3 contains
at each side one-half of the hexagonal figure; this is for the purpose of
affording greater facility for moulding bars of considerable depth, as
shewn at Fig. 4.
Having thng fully described and illustrated the nature and partionlars

page_text: The construction of frames or supports for grate bars having lips or
projections thereon, as and for the purpose herein fully described.
Secondly. The construction of grate bars, substantially as illustrated
by Drawings, and herein fully described.
In witness whereof, I, the said James Pickup, have hereunto set
my hand and seal, this Twenty-ninth day of May, in the year of
our Lord One thousand eight hundred and seventy-three.
Witness,
WALTER BRIERLEY,
Tasker & Brierley,
Patent Agents,
JAMES PICKUP. (L.S.)
Halifax, Bradford, & Blackburn.