Year: 1886

page_text: I, ISAAC WILBUR SWALLOW, residing at Kingston, in the County of Luzerne,
and State of Pennsylvania, United States of America, Locomotive Engineer, do
hereby declare the nature of this invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
My invention relates to grate bars for stoves, ranges, locomotive engines, &c.,
and it consists in the construction and novel combination of parts, as hereinafter
described and pointed out in the claims.
Referring by letter to the accompanying drawings, I will describe this improve-
ment as applied to a locomotive grate bar, which description taken in connection
with the accompanying drawing will be sufficient to enable persons skilled in the
art to which the invention pertains to apply to a stove, range, or the like.
a, designates the fire box which is rectangular in form and is provided with rigid
longitudinal bars, b, b, arranged in pairs in the end walls of the fire box and resting,
also, (where more than one section bar is needed) on intermediate cross bars, c, c,
near the bottom of the fire box.
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1
d, d, d, are the tumbler bars which are free at their ends and are connected.
intermediately of their ends by bolts and nuts, e, to the upper ends of curved
arms, ff, pivoted in bearings between the cross bars, c, c. The tumbler bars, d,
are of solid wrought iron, and rest when in their normal positions, in notches in
the upper edges of the cross bars, cc, where water bars are used in order that the
water bars may prevent the tumbler bars from being so rapidly burned out as they
would otherwise be g
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The lower ends of the pivoted arms, f, f, are straight and are connected by slotted
bars, g, g, the ends of said arms being pivoted in slots, h, h, and, h¹, by nut bolts.
The upper ends of the pivoted arins are curved as shown so that when the tumbler
bars, d, are raised they will come directly over the space between the rigid bars or
water bars, as the case may be of each pair of the latter bars. At one side of the
grate a double curved arm X, X¹, connects two of the tumbler bars, d¹, d³, and is
provided with a straight arm, f, at its lower end. These two connected bars, d¹, d³,
I term the double tumbler bars. By this construction, when the single tumbler
bars and the bar, d², are raised between and over the rigid bars, the bar, d², of
the double tumbler bar next to one wall of the fire box will be lowered and vice

page_text: versa. In another form, at one side of the grate a tumbler bar i, is arranged to be
drawn under the water bar next to it instead of being raised over, as the other
tumbler bars. are, for the reason that the single bar would not operate if connected
to a pivotal arm, as the others are, the side wall of the fire box at that side being
in the way. The single bar is therefore connected to two inclined transverse arms
near its ends, by nut bolts and these arms are connected at their other ends by
nut bolts to sliort rigid arms, n, m, depending from the shaking rod which has
bearings in the end walls of the fire box and in the transverse cross bar. The
notches for the single bar are longer and deeper than those for the bars, d, so that
the single bar can be drawn under its bar when the grate is shaken. The heads of
the nut bolts that secure the tumbler bars to their respective arms rest in counter-
sinks in the top sides of said bars, making the top surfaces of the grate smooth and
also shielding the thread and nut from the fire.
The construction is so simplified and arranged that in case any part becomes
worn out, or broken it will take but a few minutes to replace it with a new one; as
it is only necessary to take off two or three nuts to get out any of the several.
pieces.
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. A fire grate for locomotive fire boxes, consisting of a series of water bars and
movable tumbler bars extending longitudinally of the fire box, beside and parallel
with the water-bars, curved levers and a bar pivoted to the lower ends of the
curved levers, whereby the said tumbler bars may be raised on curvilinear lines,
substantially as specified.
2. The combination with a fire box of a series of grate bars and a series of
tumbler bars, which are approximately on the same horizontal plane in their normal
positions, a bar beneath the grate and tumbler bars, and levers having curved
extensions pivotally connecting the tumbler bars with the said lower bars and
passing between the grate bars, substantially as specified.
3. A fire-grate for fire boxes, consisting of a series of stationary bars and
movable tumbler bare extending longitudinally of the fire box beside and parallel
with the stationary bars, a shaking rod, curved connections and means for con-
necting the shaking rod, with said curved connections, to raise and lower said
tumbler bars on curvilinear lines, substantially as specified.
4. The combination with the rigid grate bars of the single tumbler bars, the
double tumbler bars, the slotted connecting bars and supports, substantially as
specified.
5. The combination with a fire box, having the horizontal rigid grate bars
arranged in pairs, of the single tumbler bars and the double tumbler bar pivoted
below the rigid grate bars, and connected by the slotted connecting bar, substantially
as specified.