IMPROVEMENTS IN FURNACE GRATES
Year: 1879

page_text: LETTERS PATENT to August Kohlhofer, of Munich, in the Kingdom of Bavaria,
but at present of No. 28, Southampton Buildings, in the County of Middlesex,
for the Invention of "IMPROVEMENTS IN FURNACE GRATES."
PROVISIONAL SPECIFICATION left by the said August Kohlhofer at the
Office of the Commissioners of Patents on the 6th August 1879.
AUGUST KOHLHOFER, of Munich, in the Kingdom of Bavaria, but at present of
No. 28, Southampton Buildings, in the County of Middlesex. "IMPROVEMENTS IN.
FURNACE GRATES."
According to my Invention furnace grates are constructed of a number of separate
furnace bars, by preference of moderate length resting with their ends on supports,
between which each bar has a shaped projection extending. downwards a
considerable distance, by preference in the form of an open hoop. At the lowest
point each such projection is embraced loosely by a separate loop on a transverse
bar, which consequently connects all the bars in one and the same row loosely
together. Thus by imparting a reciprocating motion to the transverse bar by any
convenient means, all the furnace bars connected thereto will be rocked on their
supports, and consequently the clinkers and ashes collecting thereon will be
effectually broken up and removed.
The requisite reciprocating motion may be conveniently imparted to the transverse
bar by a longitudinal shaft projecting in front of the furnace door, where. it is
provided with a lever by which it can be rocked in its bearings, while at the said
transverse bar or bars it has fingers taking into notches in the latter. As before
stated, the furnace bars are by preference in short lengths, two or more rows of
which are arranged in line with each other, and the contiguous ends, made to
overlap each other, so that both such ends are supported by the narrow upper edge
of one and the same transverse bearer on which the bars rock as above described.
Such overlapping ends are slightly cranked, so that the joint thickness of the two
ends is equal to the thickness of the bar together with the space intervening
between two bars. The transverse bearers are of some depth, and have large
openings through which the air can freely pass to the underside of and through the
grate. They also support the bearings for the longitudinal rocking shaft, by which
the reciprocating motion is imparted to the transverse connecting bars.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said August Kohlhofer in the Great Seal Patent Office on the 28th
January 1880.
AUGUST KOHLHOFER, of Munich, in the Kingdom of Bavaria, but at present of
No. 28, Southampton Buildings, in the County of Middlesex. " IMPROVEMENTS IN
FURNACE-GRATES.”
"
According to my Invention furnace grates are constructed of a number of separate
furnace-bars, by preference of moderate length, resting with their ends on supports,
between which, each bar has a V-shaped projection extending downwards a
considerable distance, by preference in the form of an open loop. At the lowest
point each of these projections is embraced loosely by a separate loop on a transverse
bar, which consequently connects all the bars in one and the same row loosely
together. Thus by imparting a reciprocating motion to the transverse bar by any
convenient means, all the furnace bars connected thereto will be rocked on their
supports, and consequently the clinkers and ashes collecting thereon will be
effectually broken up and removed. The requisite reciprocating motion may be
conveniently imparted to the transverse bar by a longitudinal shaft projecting in
front of the furnace door, where it is provided with a bever by which it can be
rocked in its bearings, while at the said transverse bar or bars it has fingers taking
into notches in the latter. As before stated the furnace bars are by preference in
short lengths, two or more rows of which are arranged in line with each other, and
the contiguous ends made to overlap each other, so that both such ends are
supported by the narrow upper edge of one and the same transverse bearer on
which the bars rock as above described. Such overlapping ends are slightly
cranked, so that the joint thickness of the two ends is equal to the thickness of the
other part of the bar, together with the space intervening between two bars.
The transverse bearers are of some depth, and have large openings through which
the air can freely pass to the under side of and through the grate. They also
support the bearings for the longitudinal rocking shaft by which the reciprocating
motion is imparted to the transverse connecting-bars.
On the accompanying Drawing, Fig. 1 shews a longitudinal section of a furnace-
grate constructed according to my Invention; Fig. 2 shows a plan; Fig. 3 shews a
transverse section on line X.X. Fig. 1; and Fig. 4 shews a view of one of the
transverse bearers. The bars a, a, rest with their ends on transverse bearers b, b,
the contiguous ends of two lengths of bars being cranked as shewn so as to overlap
each other, thus enabling the two ends to be supported by the thin upper edge of
one and the same bearer. The V-shaped extension a¹ of each bar, formed by
preference as an open loop, as shewn, is embraced loosely by a loop on a transverse
bar c, by means of which bar all the furnace-bars of one row are consequently
connected together and prevented from being displaced in stoking. The loops of
the transverse bar may conveniently be formed by a cast metal bar c' having comb-
like projections c², the spaces between which are closed at bottom by plates c³
secured by screws as shewn. Thus it will be seen that by imparting a reciprocating
longitudinal motion to the transverse bars a rocking motion will be imparted
simultaneously to all the furnace bars upon their supports. Such reciprocating
motion may be conveniently imparted to the transverse bars by means of a
longitudinal shaft d carried in bearing e, e, fixed to the tranverse bearers b, and
having tappets f secured thereon by set screws, as shewn, which tappets enter
between two of the loops on the bar c, or between the V projections of two
contiguous bars, so that by imparting to the shaft d a rocking motion in its bearings
by means of a hand lever g outside the furnace the desired reciprocating motion
will be imparted to the transverse bars and furnace bars.
The shaft d is held in position in its bearing by means of loose collars & secured

page_text: by set screws. The transverse bearers 6 being formed with large openings, and the
V projections of the grate bars being also open, it will be seen that the air can pass
freely to the underside of and through the grate.
Having thus described the nature of my said Invention, and in what manner the
same is to be performed, I claim,―
First. The construction of furnace grates wherein each furnace bar has a deep
extension on its underside, by which it is connected loosely to a loop on a transverse
bar that serves both to tie all the bars of one row together and to impart to them &
rocking motion on their bearings substantially as and for the purposes herein described.
Second. In furnace grates constructed as set forth in the preceding claim, the use
of furnace bars a having a loop-shaped extension a¹ on their underside adapted for
connection to a transverse bar for imparting a rocking motion thereto, substantially
as herein described with reference to the accompanying Drawing.
Third. The combination of the furnace bars a with V-shaped extension a¹, looped
transverse bar c, and longitudinal rocking-shaft d, with tappets f for imparting a
rocking motion to the furnace-bars, as and for the purposes herein described.
In witness whereof, I, the said August Kohlhofer, have hereunto set my hand
and seal, this Twenty-sixth day of January, in the year of our Lord One
thousand eight hundred and eighty.
AUGUST KOHLHOFER. (L.S.)

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