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Патент USA US2110804

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arch 8, 1938., ‘
Filed July 29, 1936
2 Sheets-Sheet 1
, 193.,
Filed July 29. 1936
2 Sheets-Sheet 2
Patented Mar. 8, 1938
2,1 10,804‘
Ernst Ludi,- Solothurn, and Justus Burger,
Zurich, Switzerland; said Ludi assignor to said
Application July 29,
1936, Serial No. 93,258 V
In France August 10, 1935
2 Claims. (Cl. 126——1'73)
The invention relates to a raking device for
are such that each of the two wings cleans one
furnace grates and more particularly to the class half of an opening between two grate ‘oars. By
of raking devices comprising rows or series of rocking the shaft i one or the other of the wings
rake-blades adapted to enter between the grate BI, 82 enters the corresponding grate opening,
5 bars and means for moving the blades .up and all the teeth 83, 85 may be brought to- pass over
down, so as to loosen the fuel and bring the cinder the upper face of the grate and to enter the ?re
and the ashes through the grate.
bed to agitate the fuel on the top of the grate and
One object of the invention is to provide a new . to readily cut any clinker that may rest in cakes
and improved raking device of the class set forth on the grate. The blades 5 are provided with
10 which is simple and durable‘ in construction and holes 12. When the blades 5 pass into the ?re 10
easily manipulated to insure proper raking of the bed, pieces of clinker pass. into the said holes l2
fuel and to bring down the cinder without loss and are brought down into the ash pit by the re
of fuel.
versal of the blade movement. The shaft l is
The invention consists of novel features and of square cross-section, each blade 5 is held be
15 parts and combinations of the same as will be
fully described hereinafter and then pointed out
in the claims.
Several practical embodiments of the invention
are shown in the accompanying drawings form~
20 ing part of this speci?cation in which similar
characters of reference indicate corresponding
parts in all the views.
Fig. 1 is a sectional elevation of the ?re box of
a furnace with the improvements applied.
Fig. 2 is a sectional elevation on line II-II
of Fig. 1,
Fig. 3 illustrates a raking blade of modi?ed
construction in a, plan view.
Figs. 4 and 5 show a modi?ed construction in
30 front elevation and in a ground plan respec
Fig. 6 illustrates a modi?cation of the device
shown in Figs. 4 and 5, in a front view and show
ing the interconnection of the blades.
Figs. 7 and 8 illustrate a further embodiment of
the invention in front elevation and in a ground
plan respectively,
Fig. 9 is a front elevation of a modi?ed ar
rangement of the blades with reference to each
40 other.
The ?re box B of the furnace is of the usual
construction and may be of any size, the im
provement is adapted for use in connection with
a variety of furnaces. Grate bars 8 of suitable
45 cross-section are arranged in the lower portion
of the furnace. In the ash pit P under the
grate bar 8 a shaft l is rotatably mounted in
bearings 2 and 2' arranged on opposite ends of
tween two adjustable set-rings 3, 4 ?xed to 15
shaft I by set screws. To rock the shaft l a
crank-handle 9 is provided which is removably
?xed on the shaft i and which is outside the ?re
box. The blades 5 are wholly below the grate,
some teeth 83 being the only parts of the blades 20
that extend through or into the grate. The
blades 5 do not hinder the ashes from falling
through the grate into the ash pit, moreover they
do not prevent the access of air to the fuel on
the grate and reach not into the red hot fuel. 25
The serrated faces of the blades 5 and the holes
l2 thereof engage clinkers near the ends of the
grate openings and tear it down into the ash pit.
In Fig. 3 a modi?ed construction of the shaped
element is shown. The blade l4 comprises two 30
wings which are in one line and which have a
straight upper edge on which the teeth are ar~
ranged. A row of holes [2 is arranged near the
upper edge. The dimensions are such that the
teeth do not project above the grate 8, if the blade 35
is not in operation. When. the latter is rocked
only one side of each blade l4 enters the fuel.
The two sides of the grate are worked one after
the other.
The construction shown in Figs. 4 and 5 com 40
prises two shafts 20 and 2| running parallel to
each other and being arranged near the side
walls of the ?re box. The blades 22 working
in the openings of the grate 8 are alternately
attached to the shafts 20, 2|. Each blade 22 45
is located under a gap in the grate. The upper
edge of each blade 22 is provided with teeth
adapted to brake through the cinder or slack.
the grate and running in the middle of the grate. " In each blade a row of holes I2 is arranged.
50 On the shaft I toothed blades 5 are arranged one
for each opening between two consecutive grate
bars 8. Each blade 5 comprises two wings BI,
82, the upper edges of which are provided with
teeth 83, 84 of varying size. The outer edges
55 85 are serrated. The dimensions of the wings
On each shaft 20, 2! an arm 35, 3! is rigidly 50
?xed. The arms 35, 3| are interconnected by
the rod 25. To the square ends of the shafts
20, 2| the crank lever may be attached and by
turning one of the shafts 25, 2! the other will
be rocked. The blades 22 enter the gaps in the 55
grate alternately. In the position of rest, the
blades 22 are well within the gaps and well below
the grate surface, leaving su?icient space for the
air to enter the bed of fuel.
In Fig. 6 a modi?ed construction is shown.
The shafts 2|, 2| are interconnected by a rod
21 which is linked to the arms 33, 34, projecting
on different sides of the shaft. In each gap of
of the grate a blade 26 of the shafts 20, 2| is
10 arranged. The blades are only half the length
shown in Figs. 4 and 5. By rocking done by
the shafts 20, 2| the blades 26 go up» and down
The blades 26 are each ar
ranged with a plurality of holes l2 working in the
15 manner aforesaid.
A still further construction is shown in Figs.
7 and 8. The blades 28, 28' are arranged on a
common shaft l arranged below the bar 8 in the
ash pit.
The blades 28, 28' are well below the
The upper edges of each blade
is provided with teeth and each blade is pro
vided with a plurality of holes I2. Consecu
tive blades 28, 28’ work on the right or left hand
side of shaft |. Each blade 28, 28’ works only
25 one side of the grate.
20 grate surface.
In Fig. 9 blades 35 are arranged on a common
shaft l which runs in the centre of the grate 8
and well below it. The blades 35 are provided
on two» opposite edges with teeth, moreover sev
eral rows of holes |2 are arranged running con
centrically to shaft |. By rocking shaft | the
one or the other edge is brought in engagement
with the gaps of the grate 8, as shown by broken
lines in Fig. 9. In all the cases the holes l2
bring down the cinder into the ash pit.
What we claim is:—
1. In combination with the grate bars of a
furnace, blade shaped elements oscillatably
mounted below said bars in alignment with the
spaces between the bars, the upper edges of said
blade shaped elements being formed as a series
of inverted V-shaped teeth, said blade shaped
elements having clinker receiving holes for pur
poses described.
2. In combination with the bars of a grate, of
at least one shaft rockably mounted below the
bars, an actuating device for said shaft, and
raking blades carried by said shaft and aligning
with the spaces between the grate bars so that
upon actuation of said shaft said blades. may be
raised through the spaces between the bars, said
blades having their active edges provided with
sharpened serrations and having a set of clinker
receiving holes adjacent said serrations for pur
poses described.
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