Improvements in Furnace Grates.
Year: 1890

page_text: Date of Application, 5th June, 1890
Complete Specification Left, 4th Mar., 1891-Accepted, 4th Apr., 1891
PROVISIONAL SPECIFICATION.
Improvements in Furnace Grates.
I, JAMES KEITH, Assoc. M. Inst. C.E., of 57, Holborn Viaduct, in the City of
London, Gas, Hydraulic, Heating, and Ventilating Engineer, do hereby declare
the nature of this invention (a communication from abroad by Messrs. Bartlett,
Hayward & Co., Engineers. Baltimore, Maryland, United States of America) to be
as follows:-
The improved furnace grate constituting this invention and which is designed
mainly for use for the fires or furnaces of hot water and steam boilers is composed
of a number of bars each formed with a series of arms projecting horizontally from
either side the bars being made so that the projecting arms on the one enter the
spaces between the arms of those adjoining and being carried in bearings formed in
side frames or in side and central frames so as to be capable of a rocking movement
therein.
From the end or other part of each bar depends an arm which is jointed to a
long bar or bars extending transversely under the grate bars but in general
longitudinally of the furnace grate and by imparting to this bar a reciprocating
motion, which is done by a lever handle jointed to it outside, the several grate bars
receive a rocking motion which serves to prevent the formation of clinker and to
shake through ash and cinders.
Dated this Fourth day of June 1890.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Furnace Grates.
I, JAMES KEITH, Assoc. M. Inst., C.E., of 57, Holborn Viaduct, in the City of
London, Gas, Hydraulic, Heating, and Ventilating Engineer, do hereby declare the
nature of this invention, and in what manner the same is to be performed, as
communicated to me, to be particularly described and ascertained in and by the
following statement:―
The improved furnace grate constituting this invention and which is designed
mainly for use for the fires or furnaces of hot water and steam boilers is composed
of a number of bars each formed with a series of arms projecting horizontally from
either side the bars being made so that the projecting arms on the one enter the
spaces between the arms of those adjoining and being carried in bearings formed in
side frames or in side and central frames so as to be capable of a rocking movement
therein.
From the end or other part of each bar depends an arm which is jointed to a
long bar or bars extending transversely under the grate bars but in general longi-
tudinally of the furnace grate and by imparting to this bar a reciprocating motion
which is done by a lever handle jointed to it outside the several grate bars receive a.
rocking motion which serves to prevent the formation of clinker and to shake
through ash and cinders.
The improved plate is illustrated in the accompanying drawing in longi-
tudinal vertical section at Figure 1, in plan at Figure 2 and in transverse
section looking towards the back and front of the grate respectively at Figures 3
and 4. Figure 5 is an elevation of the centre frame, and Figures 6 and 7 are

page_text: respectively a longitudinal section and a perspective view showing the grate fitted
into the furnace of a hot water boiler similar to that described in the Specification
of my Patent No. 3013 of 1887.
The grate is composed of a number of bars, A formed with a series of projecting
arms a the arms a on one bar projecting into the spaces between the like arms on the
adjacent bars. These bars A are formed with pins a¹ on their ends, the said pins
resting in bearings formed in side frames B and being retained therein by bars
which are recessed on their underside to form covers for the said bearings. The
covers bare attached to the side frames B by means of bolts which have counter-
sunk heads and are preferably fixed by means of cotters. The side frames B are
connected together at their ends by means of front and rear frames C and D said
frames being provided on their inner faces with projecting arms ed similar to the
arms a on the bars A. In large grates a centre frame E is provided and formed
with bearings for the pins a' similar to those on the side frames B.
The cuds of the bar E are supported on brackets e forned on the end frames C D
and are steadied by a vertical flange on said frames entering between the double
web of the centre frame E.
The bars A have each a depending arm a² which is jointed to a longitudinal
bar F said bar being connected to a short arm on a lever G which can be
operated from the outside of the furnace to impart a rocking motion to the bars A.
The bearings for the bars are made slightly oval and ample space is left between
the ends of the bars and the side and centre frames to allow for expansion.
In Figures 1 to 4 the framing of the grate is shown supported on legs, but
when fitted into the form of boiler illustrated at Figures and 7 these legs are
dispensed with and brackets H are cast on the base of the boiler to support
the framing. The brackets H at one end of the furnace are formed with a recess h
which holds the end frame of the grate firmly in position the other end frame
and the side frames simply resting on level portions of the brackets to allow for
changes due to expansion.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, as communicated to me,
I declare that what claim is --
1. A. furnace grate constructed substantially as hereinbefore described.
2. A furnace.grate composed of a number of rocking bars each formed with a
series of arms projecting horizontally from either side substantially as described.
3. A furnace grate composed of a number of furnace bars formed as described
and carried in bearings in side frames each bar having a lever arm formed thereon
and connecting to a reciprocating bar whereby a rocking motion is communicated
to the furnace bars substantially as described.
Dated this Third day of March 1891.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.