AN IMPROVEMENT IN GRATE-BARS to
Year: 1884

page_text: THOMAS DUGARD Clerk, of 84 Greenwood Road London Middlesex do hereby
declare the nature of my Invention for AN IMPROVEMENT IN GRATE-BARS to bo
as follows: Reference is to be had to the accompanying Drawings, forming part
of this Specification, in which similar letters of reference indicate corresponding
parts in all the Figures:-
.:
J
Figures 1, 2, 3 are respectively perspective and cross sectional views of the
grate-bars.
1
My improvements in the grate-bars of a furnace are clearly represented in the
detail views of Figs. 1. 2 and 3 showing a double or cluster bar. I form each bar
of a main plate a², tapered from top to bottom, as shown in Figs. 2 and 3 and
widest at the centre, as shown in Fig. 1, and form on the plates a suitable spacing
blocks or pieces, 62, for sidewise support of the bars one by the other, by contact of
the blocks 63; and at each side and at the upper edge of the plate a², I form the
fins or tongues c², the tongues of one side being opposite the spaces between the
tongues of the other side of the plate, or in transversely staggered position; and
the tongues c are beveled downward and inward to the plate a², thus permitting,
by their shape and relative position with each other, a very large and free air-inlet
between the plates and tongues, while presenting ample surface for the support of
very fine coal or dust fires.
An important feature of my grate-bar is the concavity or groove in and along.
the top or fire surface of the bars, which may either be of rounded form as at d²,
Fig. 2. or of angular form as at es Fig. 3, the object of the groove in either case
being to form a receptacle along the top of the bar, in which ashes may lodge to
protect the bar from the intense heat of the fire. The bars h may be connected by
their spacing-blocks b, to form double or triple, bars, or be made singly, as
indicated by the central vertical dotted line of Fig. 2.

page_text: THOMAS DUGARD, Clerk of 84 Greenwood Road Dalston in the County of
Middlesex do hereby declare the nature of my Invention for AN IMPROVEMENT IN
GRATE-BARS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement: Reference is to be
had to the Drawings accompanying my Provisional Specification :—
Figures 1. 2 and 3 are respectively perspective and cross-sectional views of the
grate-bars. My Invention relates to improvements in grate-bars; and it consists
in the peculiar construction and arrangement of the parts as hereinafter more fully
set forth, and pointed out in the claims.
My improvements in the grate-bars of a furnace are clearly represented in the
detail views of Figs. 1. 2 and 3 showing a double or cluster bar. I form each bar
of a main plate a², tapered from top to bottom, as shown in Figs. 2 and 3 and
widest at the centre, as shown in Fig. 1. and form on the plates a suitable spacing
blocks or pieces, b², for sidewise support of the bars, one by the other, by contact
of the blocks b; and at each side and at the upper edge of the plate a², I form the
fins or tongues c³, the tongues of one side being opposite the spaces between the
tongues of the other side of the-plate-or-in-transversely-staggered_position; and
the tongues c² are beveled downward and inward to the plate a³, thus permitting,
by their shape and relative position with each other, a very large and free air-inlet
between the plates and tongues, while presenting ample surface for the support of
very fine coal or dust fires.
An important feature of my grate-bar is the concavity or groove in and along
the top or fire surface of the bars, which may either be of rounded form, as at d³,
Fig. 2, or of angular form as at e³, Fig. 3, the object of the groove in either case being
to form a receptacle along the top of the bar, in which ashes may lodge to protect
the bar from the intense heat of the fire. The bars h may be connected by their
spacing-blocks 63, to form double or triple bars, or be made singly, as indicated by
the central vertical dotted line of Fig. 2. A grate-bar thus constructed is cheaply
nade and readily applied to or removed from the furnace, and has in practice
proved unusually durable and giving most satisfactory results.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. The fixed grate-bar composed of the parallel plates a², provided with
tongues c², on their opposite sides, beveled downwards and inward to the plates,
and arranged in staggered position substantially as shown and described.
2. The combination, in a fixed grate-bar, of the plates a², tongues c³, beveled
downward and inward to the plates, and arranged in staggered position at opposite
sides of the plate a², and the parallel-edged spacing blocks 62, substantially as
shown and described.
3. The combination, in a fixed grate-bar, of the tapering plates a², each having
a recess along its upper edge, tongues & beveled downward and inward to the
plates, and arranged in staggered position at opposite sides of the plates, and
parallel-edged spacing blocks 62, substantially as shown and described.
Dated this 20th day of Iul., 1994