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Патент USA US2132380

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Oct. 11, 1938.
Filed March 4, 1935
5 SheetS-Sheet l
f/vvE/v TOE’: I
John G. Affwooaf.
Oct... 11, 1938.
I J. G. ATTwooD
Filed March 4, 1935
5 Sheets-Sheet 2
[An/EN TOR.‘
‘Jo/7n G AffWOOO',
Oct. 11, 1938.
Filed March 4, 1935
5 Sheets-Sheet 5
John G H/‘fwooa?
Oct. 11, 1938.
Filed March 4, 1955
5 Sheets-Sheet 4
John G H7’7‘wooof
11, 1938 _
John G. Attwood, Columbus, Ohio, assignor to The
Jeiirey Manufacturing Company, a corporation
of Ohio
Application March 4, 1935, Serial No. 9,147
4 Claims. (01. 209-496)
This invention relates to a jig and particularly
to an automatic means for controlling the dis
charge of refuse from a jig.
An object of the invention is to provide a new
5 and improved automatic means for controlling
the discharge of refuse from a jig whereby a ref
} use bed of substantially constant depth may be
Another object of the invention is to provide
10 an improved ?oat for an automatic refuse dis
charge mechanism of a jig, which ?oat is sub
stantially “?sh”-shaped.
provide a new and " .nproved automatic means for
is controllingthe depth of a refuse bed on a jig
screen, which means is extremely sensitive in
operation, yet is very rugged and which includes
a “?sh”-shaped ?oat mechanism which is en
tirely submerged in the jig bed during operation.
Other objects of the invention will appear here
inafter, the novel features and combinations be
ing set forth in the appended claims.
Referring to the accompanying drawings:
Fig. 1 is a side elevational view of a jig com
25 prising my invention, with parts shown in sec“
Fig. 2 is a front end elevational view of the
device of Fig. 1, with parts removed to illustrate
certain operating details more clearly;
Fig. 3 is an enlarged plan view of the ?oat con
trolled mechanism of my invention, with parts
shown in section;
Fig. 4 is an enlarged elevational view of the
mechanism of Fig. 3;
be treated, such as raw coal as it is received from’ 10
a mine. [This raw coal may or may not have been
previously screened to regulate the size range of
A more speci?c objectof the invention is to
Said jig comprises a frame I built up of longi
tudinal and lateral I-beams and upstanding angle
members and plates forming a rigid construc
tion which supports a tank 2 formed into two
compartments 3 and 4. Said compartments 3 5
and. 4 are similar in most respects. At the left of
compartment 3, as viewed in Fig. l, the tank 2
is provided with a material receiving chute 5
which is adapted to receive the raw material to
Fig. 5 is an enlarged plan view of the “fish”
shaped ?oat comprising my invention;
Fig. 6 is an enlarged elevational view of the
?oat of Fig. 5;
Fig. 7 is a sectional view on the line ‘l—-'| of
40 Fig. 6;
the material to be treated. Adjacent the right
hand end of the tank 2, as viewed in Fig. 1, there
is provided a discharge chute 6 for discharging the i5
clean coal from the jig.
Within each of the compartments 3 and 4,
there is provided a perforate screen plate ‘I which
is pivoted at its forward end at 8 and supported
by adjustable hangers 9 adjacent‘ the rear end 20
thereof. As is seen in Fig. 2 of the drawings, there
are two hangers 9 ‘in each compartment, which
hangers are positioned adjacent the side walls of
the tank 2. These adjustable hangers provide for
an adjustable determination of the inclination of 25
the screen plate which is an important factor in
controlling the rate of travel of the bed of ma
terials thereacross and maintaining said rate of
travel uniform whereby there will be no piling up -
of material followed by a “land-slide” thereof. 30
In addition, this adjustable screen provides for a
uniform depth of refuse bed over the entire screen
which provides uniform conditions of jigging
throughout the bed and provides for adjustment
of the bed whereby all particles of refuse, regard- 35
less of size, will ?ow toward the refuse discharge
opening it at the same rate. This adjustable
screen cooperates with the hereinafter described
?oat mechanism to makepossible an automatic
withdrawal of refuse while maintaining constant 40
Fig. 8 is an enlarged sectional view on the line
conditions of jigging.
Adjacent the pivotal position 8 of the screen
Fig. 9 is an enlarged elevational view of the‘ plate ‘I, there is provided an adjustable plate 9'
8-4 of Fig. 1;
operating means for the refuse discharging rotary
.35 valve;
Fig. 10 is a sectional view on the line llL-lt of
Fig. 9; and
able size which leads to a refuse discharge chute 45
ll within which is positioned a rotary refuse dis
charge valve IZ which, when rotated, is adapted
Referring particularly to Figs. 1 and 2 of the
drawings, there is illustrated a two-compartment
jig comprising my invention. It is evident, how
ever, that the number of compartments may be
to discharge accumulated refuse in the chute II
into the boot i3 of an elevating mechanism, gen
erally indicated at M, which is operative to remove 50
the refuse from said boot l3 and discharge it out
side the jig. The elevating mechanisms M for
the two compartments 3 and 4 are driven from a
increased or decreased without departing from
common electric motor I5 through an appropriate
Fig. 11 is a sectional view on the line il-ll
of Fig. .1.
forming a refuse discharge opening ill of ‘adjust
55 the invention.
drive gearing including the coupling shaft I6.
Within the bottom of each of the compartments use bed and the clean coal forming the upper
strata. The clean coal, after being subjected to
3 and 4, there is provided a diaphragm I'I, pref
erably circular in circumference, which is ?ex . a jigging operation in said compartment 4, will
ibly attached to a ?ange forming a stationary
bottom of the compartment by means of a ?ex
ible ring I8, preferably made of rubber. Means
are provided for imparting a reciprocatory mo
tion to said diaphragm [1 along an axis which is
slightly inclined to the vertical andwhich is ap
proximately perpendicular to the plane of the
screen plate ‘I. This means comprises a bracket
IT’ to the bottom of which is attached a piston
l8’ (Fig. 11) carried by a piston rod l9, which
piston l8’ ?ts into a cylinder 20 adapted to be
15 supplied with substantially constant air pressure
from an air line 2|. Pivoted to said bracket I1’
is a pair of connecting rods 22 which are pivoted
to a rocker beam 23, which rocker beam 23 is piv
oted to bracket 24 rigidly attached to the inclined
20 frame channels 25. The rocker beam 23 carries
a roller 26 adapted to cooperate with a cam 21
mounted upon a shaft 28. The cam 21 has a
groove forming both top and bottom tracksl2'la
and 21b within which groove the roller 26 is
be discharged over the chute 6.
The refuse forming abed on the screen ‘I will
be discharged into the chute I I through the open
ing Ill and then discharged by the valve l2 into
the boot l3 of the elevating mechanism l4, by
which elevating mechanism l4 it is elevated to
a discharge position and discharged from a noz 10
zle 36. As the refuse from the compartments 3
and 4 are discharged from separate nozzles 36,
they will be separately received and may be given
individual treatment, if desired. In some in
stances, it has been found that the refuse from the 15
second compartment 4 may have su?icient heat
value to be sold as low grade fuel.
The principal feature of my invention lies in
the mechanism for controlling the discharge of
the refuse which accumulates on the screen 1. 20
Extensive tests have demonstrated that to'obtain
the most satisfactory stratification of the mate
rials and consequently the most e?icient separa
tion of coal and refuse, the bed of refuse which
forms on the screen plate 'I' should be of reason 25
, ably constant depth. It is the primary function
of the automatic refuse discharge means of my
invention to keep this refuse bed at a reasonably
constant depth and to make this operation en
30 phragm l'l during each cycle of operation.
tirely' automatic. While numerous attempts 30
An electric motor 3| (Figs. 1 and 2) is pro-v have been previously made to produce this de
sired result, none has been entirely satisfactory
vided for driving the shafts 28 of each of the com
partments 3 and 4, said shafts 28 being connected in actual operation, of which I am 'aware. The
by a chain-and-sprocket mechanism 32 including above mentioned tests have indicated certain
35 an adjustable chain ten'sionlng idler 33. It is
difficulties in known devices which are overcome 35
in the construction of my invention.
evident that as the motor 3| is driven the dia
It has been discovered that the ?oat of an
phragms ll of the compartments 3 and 4 will
be reciprocated causin'g pulsating movement of automatic mechanism should be of the totally
the ?uid in the tank 2 with respect to the screens submerged type and in my invention a ?oat 3'!
adapted to move.
The-connecting rods .22 are
pivotally connected to a block 29, which block 29
may be slidably adjusted along track 30 on the
rocker beam 23. This adjustment of the block 29
provides for adjustment of the stroke of the dia
1. In the preferred arrangement,' the cycle of
operation of these two diaphragms is 180 degrees
out of phase thereby'making the load more uni
form on the motor 3|, though this arrangement
is by no means necessary.
The function of the cylinder 20 is to balance
the load on each side of thediaphragm I'I so
that the motor 3| need supply only su?lcient
energy to reciprocate said diaphragm. That is,
the air pressure‘ in the line 2| is supplied to the
of the totally submerged type is provided. The
reason the ?oat should be of the totally submerged
type lies in the fact that due to the upward and
downward movement of the water in the com
,partments 3 and 4 the ?oat has a tendency to
rise and fall ,in said compartments. Unless the
?oat is of the totally submerged type, this rising
and falling thereof causes a variation in the
separation of the particles of material, whereby‘
amount of water displaced by said ?oat from one
instant of time to the next during a complete
cycle of operation. This means that in effect the
weight of the ?oat is constantly varying from
instant to instant during a cycle of operation.
Where the ?oat is totaly submerged, this varia
tion is avoided. It has also been discovered that
for the totally submerged ?oat to be entirely sat 55
isfactory, said ?oat must be so designed that
nothing will vary its effective weight. If the sub
merged ?oat has a-?at top or even a gradually
sloping top, it is found in actual operation that
particles of material will rest on the top of the 60
?oat and thus change its effective weight. This
may be caused by the presence of a dead spot
directly above the ?oat due to lack of stream
the refuse, such as shale, will form a bed directly
lining for the upwardly moving ‘water and also
50 cylinder 20 and acts upon a piston within said
cylinder 20 to balance the normal load on top of
the diaphragm I'I.
An appropriate valve 34 is provided for each
of the compartments 3 an 4 to control the admis
55 sion of water to the tanks of said compartments.
It will be evident from the above description
that when material to be treated-such as raw
coal-is fed'to'the jig'over the chute 5, it will be
subjected to a jigging operation on the screen
plate ‘I by the upward and downward movements
of water through said screen plate 'I. This jig
ging operation will be so regulated as to effect a
due to the inherent tendency for a ?at surface to 65
support any material that may fall thereon.
One of the important features of my inven
tion therefore lies in the construction of the
is, stratification will take place within the com
partment 3 with the refuse on the bottom and the\ totally submerged ?oat whereby it has a very
sharp back or top. In fact, as is well illustrated
70 coal on theitop. The coal will then be dis
charged over the adjustable height weir 35 of in the drawings, the ?oat is substantially “?sh”
compartment'3 into compartment 4 where an ad
65 onlthe screen plate ‘I while the clean coal and
possibly the lighter fractions of refuse, such as
bone, will form, in layers above the refuse. That
ditional'jigging operation will take place with
Referring particularly to Figs. 5, 6 and 7, it is
further stratification of the materials with the
seen that the ?oat has a fairly bunt nose 38 and
‘lighter particles of refuse now forming the ref
an extremely stream-lined tail‘portion 39. The 75
bottom 49 of the ?oat is rather ?at or smoothly
. rounded, as best illustrated in Fig. '1. The top or
back 41 of the ?oat forms a relatively sharp
angle and presents smooth surfaces 42 and
43 which make a relatively sharp acute angle
with the vertical. A rib 44 is provided at
the center line of the back 41, as best
seen in Fig. 5. This particular construction of the
?oat has been found to be very satisfactory: for
10 it effectively prevents any accumulation of ma
terial thereon which might tend to vary the
effective weight thereof. Furthermore, as the
?oat rises through the bed of material due to
the action of the upwardly moving water on the
bottom thereof, the top or back thereof will cut
through the bed and water will ?ow past the
sharply inclined surfaces 42and 43 and prevent
any particles from resting thereon. As the
water flows downwardly past the ?oat, it will
20 scour the surfaces 42 and 43 and prevent
the accumulation of any particles of material
D As illustrated in Figs. 5, 6 and 7, the ?oat 31
is preferably of hollow construction and in prac
25 tice may be made of cast aluminum. Core holes
45 are provided for removing the core sand after
the ?oat is cast.
These core holes 45 will, of
course, be sealed, as .by an aluminum plug.
?oat 31 is also provided with an integral extension
adjusted as thus the gravity of separation of
coal and refuse may be adjustably determined.
The arms 48 of the parallel motion mechanism
are keyed to a shaft 63 and are mounted in a.
bracket 64 by anti-friction roller bearings 65.
The bracket 64 is carried on a cross-beam 66 which
extends between the side walls of the tank 2.
Mounted on said beam 66 and adjacent one end
thereof is another bracket 61 which supports one
end of the shaft 63 by a non-friction roller bear 10
ing 68. The lower arms 51 of the parallel motion
mechanism are keyed to a small stub‘ shaft which a
is mounted on the bracket 64 by roller bearings
in a manner similar to that by which arms 48
are mounted on said bracket. It‘ is thus evident 15
that the friction of the parallel motion mecha
nism is reduced to a minimum. In addition, the
weight of the moving parts of said mechanism,
is reduced to a minimum by employing light
weight materials, such as aluminum. This results 20
in a very sensitive mechanism which has been
found necessary to provide a satisfactory auto
matic refuse discharge control device.
Keyed to the shaft 63 is an operating lever
69 which is provided with a plurality of holes
to receive selectively a couple link 19 which is
attached to a downwardly extending rod 11, which
rod 11 carries at its lower end an adjustable con
As is illustrated in Figs. 3 and 8 of the draw
ings, the post 41 is preferably of hollow construc
necting link 12 provided with anelongated aper
ture 13, as best illustrated in Fig. 9 of the draw 30
ings. The position of the ?oat 31 is effective to
control the position of a shield 14 which, inturn,
is effective to determine the rate of rotation of
tion and may Well be formed of aluminum to re
the refuse discharge valve 12.
duce its weight. This hollow construction pro-'
Before describing in detail the construction 35
of the valve operating mechanism, attention
is directed to Fig. 1 of the drawings for con
sideration of the general mode, of operation
30 46 provided with appropriate bolt holes and is
adapted to receive a connecting post 41.
vides for a. minimum of weight with a maximum
of strength. As is seen from Figs. 3 and 8 of
the drawings, the post 41 is also stream-lined to
. reduce its disturbing effect in the bed of ma
40 terials.
As best seen in Figs. 3 and 4 of the drawings,
the float 31 is connected to a parallel motion
mechanism so that the position of the ?oat 31
may control the operation of ‘the valve 12. In
.order that the ?oat 31 may be extremely sensi~
tive, the parallel motion mechanism is made ‘as
light as possible and the moving parts are mounted upon anti-friction bearings, such as needle
bearings. Said linkage mechanism comprises a‘
pair of upper spaced arms 48 between which ex
tends a shaft 49 which. is mounted in sockets 59
of said. arms 48 by anti-friction roller bearings
51. (Fig. 3.) The shaft 49 extends through a
block 52 which is connected to a lower block
53 by a shaft 54. The blocks 52 and 53 and the
shaft 54 ,are positioned within the post 41. Also
loosely mounted on the shaft 49 is a pair of
spacers 55 adapted to clamp the outside of said
post 41} Clamping nuts 56 are provided which.
60 may effect a clamping of the post 41 with respect
to said shaft 49. This construction is also dupli
Associated with the shaft 28 is a crank 15
which is effective to reciprocate the rod 16 con
tinuously while the jig is operating. This rod
16 imparts a continuous reciprocatory move
ment to the bell crank 11. The bell crank 11
carries a pawl 18, or a plurality of said pawls 45
with tips spaced 2. fraction of a tooth apart,
adapted to cooperate with a ratchet wheel 19 to
rotate said wheel periodically.
The shield 14
is effective to determine the number of notches
on the ratchet wheel 19 which will be engaged 60
by the pawl or pawls 13 during each reciproca
tion thereof. As was above described, the posi
tion of the shield 14 will be determined by the
average position. of the ?oat 31. The elongated
.slot 13 is provided so that the reciprocatory so
movement of the float 31 in response to pulsa
tions of the water will not be transmitted to
said shield 14 but said shield will assume a posi
tion determined by the average or mean posi~
tion of said ?oat 31.
' cated with respect to the lower arms 51 of the
refuse discharge mechanism should be so ad
parallel motion mechanism.
The post 41 is provided with elongated aper-_
tures 58 whereby the position of the, ?oat may be
justed that in normal operation the pawl 18, or
' adjusted with respect to the parallel motion
mechanism. Adjacent its top, the post 41 carries
a pointer.59 which cooperates with the station
ary scale 60 for indicating the position of the ?oat
31. An upstanding pin 61 isalso provided adja
cent the top of the post 41 for receiving a variable
number of washers or weights 62 for adjusting the
balance of the mechanism. It is evident that by
increasing or reducing the number of washers
62, the effective weight of the ?oat 31 may be
It has been found from experience that the
one of said pawls if two are employed, will
ratchet over at least one tooth of the ratchet 65
wheel 19 during each reciprocation of the belly
crank 11, whereby there will be a substantially
continuous withdrawal of refuse from the bed
formed on the screen 1.
If the refuse tends to
become’deeper than the pre-determined amount., 7,0
the shield will be withdrawn to allow pawl 18
to ratchet over more teeth of the rachet wheel
19, for each oscillatory movement of the bell
crank lever 11. By this mode of operation, va
riations in the depth of the refuse bed are small 76
and thus constant conditions of jigging are pre
sented. As was above set forth, the shield ‘I4
is so adjusted and is so balanced that it will
remain at any angular position to which it is
moved. This is provided by balancing the mech
anism which moves with said shield ‘I4 so that
in any angular position of adjustment it will
be in static balance.
The details of the mechanism for rotating the
10 valve I2 are best seen in Figs. 9 and 10 of the
drawings. The discharge valve I2 is of the pad
dle wheel type and is mounted upon a shaft 88,
which shaft 88 is carried at its outer end by a
bifurcated bracket 8|.
Said bracket 8I is pro
15 vided with inner and outer bearing sleeves 82
and 83, respectively.
The ratchet wheel 19 is
keyed to the shaft 88. The shield ‘I4 is carried
the inner portions of the bearing sleeves 82 and
20 83. The arms 84 also carry a bifurcated bracket
85 which carries a pin 86 which projects into
the elongated aperture ‘I3 of the coupling link
‘I2. Arms 84 also carry counter-weights 81 which
are eifective to produce the above mentioned
25 static balance of those parts which are rigid with
the shield ‘I4 for any angular position of adjust
ment of said shield ‘I4. It is thus evident that
shield 14 will remain in any position of adjust
ment to which it is moved by the ?oat 31.
Bell crank lever 11 comprises two armsg‘I‘Ia and
‘I‘Ib, which arms are journaled to the outer por
tions of the bearing sleeves 82 and 83, respec
tively. It is evident that as said bell crank lever
11 is journaled to the stationary bearing sleeves
35 82 and 83, rotation of the shaft 88 and of the
valve I2 will beaffected only to the extent that
shield ‘I4 provides for engagement of the pawl
‘I8 with the ratchet wheel ‘I8. Arms I‘Ia and "D
are sufficiently spaced from the arms 84 on the
40 bearing sleeves 82 and 83 so as to transmit no
reciprocatory motion to said shield ‘I4. If de
sired, spacing washers may be placed between the
arms ‘I‘Ia and 11b and the arms 84, which wash
ers may be keyed to the bearing sleeves 82 and
45 83 to provide a positive isolation of said bell
crank lever 11 and the arms 84. It has been
found in practice, however, that these spacers
are usually not necessary.
To provide for a ready removal of the valve
50 I2 through the side of the tank 2 a removable
plate 88 (fig. 10) is provided which cooperates
with the ring 89 welded to the side of said tank
2. The internal diameter of the ring 89 is
greater than the external diameter of the paddle
55 wheel valve I2. An appropriate packing gland
98 is provided to perform a water-tight connec-'
_ tion between the plate 88 and the shaft 88.
Referring to Fig. l of the drawings, it may be
noted that the chute I I, which leads to the valve
I2, is provided with a pivoted top plate 9| and
an arcuate seal plate 92 adapted to be held in
frictional engagement with the valve I2 by a
weight 93. This provides a release means for
the valve I2 whereby if a large particle of refuse
65 passes thereinto there will be no damage to said
valve I2, yet in normal operation there will be
sonable limits, and as illustrative it may be
known to be from 5 to 10 per cent. With ma
terial of the size range being treated, it is known
that the approximate refuse bed depth which is
desired. For example,‘ with a size range of
%"-6 mesh, an average refuse bed depth of
6 inches may be desired. The post 41 is there
fore adjusted so that arms 48 and 5'! will be
horizontal with the refuse bed 6 inches deep.’
The coupling link ‘I8 (Fig. 4) is so adjusted with
respect to the lever 69 that the range of speeds
at which shaft 88 may be rotated is sumcient to
take care of the range of variations in refuse
accumulation normally encountered, with a max
imum movement of the lever arms 48 and 51 of 15
15 degrees both above and below the horizontal,
making '30 degrees total variation. If the refuse
variations are relatively low, then the effective
length of arm 69 may be made relatively short
whereby the maximum variation in the angular 20
movement of shaft 88 for each reciprocation of
bell crank 11 will be from zero, when the ?oat is
below normal and arms 48, 51 are 15 degrees
below the horizontal, to the angle subtended by
two teeth of ratchet wheel ‘I8, when the ?oat is 25
above normal and arms 48, '51 are 15.» degrees
above normal. Under the latter’ condition, the
rate of discharge of valve I2 will be approximately
twice the normal rate of accumulation of the
refuse. When the refuse bed is at a normal depth, 30
the average position of the arms 48, 51 will be
substantially horizontal under which conditions
shaft 88 will rotate through the angle subtended
by one tooth of ratchet wheel ‘I9 during each
oscillation of the bell crank 'I‘I‘and this rate of
oscillation will be adjusted to remove the refuse
at substantially the same rate it accumulates,
in normal operation. If the refuse begins to ac
cumulate at a rate faster than it is withdrawn,
then ?oat 31 will rise and shaft 88 will be rotated 40
through the angle subtended by two ratchet
teeth during each oscillation of the bell crank
11 whereby refuse is discharged at twice the nor
mal rate until a normal bed depth is again estab
lished. Should the bed depth fall below normal, 45
which is improbable under the above mentioned
adjustment, the shaft 88 will not rotate at all
until a normal bed depth is established.
It is evident, of course, that the ?oat 31 con
tinuously oscillates with the pulsations of the _5Q_
bed under the in?uence of diaphragm II, but as
aforesaid, shield ‘I4 assumes a position deter
mined by the average position of said ?oat 31
and controls the angular rotation of shaft 88 for
each reciprocation of bell-crank 11.
Should it be found that there is a wide varia
tion in the refu .e content of the material, then
the link ‘I8 may be connected to lever 69 to
increase the effective length of said lever 68,
whereby the angle through which shaft 88 is 60
rotated for each reciprocation of bell crank 11
is that subtended by teeth of ratchet‘ wheel ‘I9
which may vary in number from 0 to 3, or 0 to 4,
for a total average angular movement of the arms
48, 51 of 38 degrees. The ranges above men 65
tioned may be increased, if desired. In addition,
a‘su?iciently close ?t between the valve I2 and the rod ‘II may be effectively shortened or length~
the chute II to prevent any material, even 'if ened whereby the minimum anguiar'rotation of
very fine, from passing into the boot I3
less shaft 88 will be that determined by the angles sub
it is discharged by rotation of the valve I2.
. tended by 1 or 2 teeth. For example, the range 70
A typical illustration of the mode of adjusting may be from 1 to 3 or 2 to 5 teeth. This is useful
when the percentage of refuse is large, or the
the device of my invention is as follows:
The capacity of the jig is, of course, known bell crank 11 is reciprocated slowly, so that even
and raw coal is fed thereto at this capacity. The with a minimum amount of refuse shaft 88 may
75 percentage [of refuse will be known within'rea- . rotate during each reciprocation of bell crank 11 75.
through an angle subtended by one or more teeth
of the ratchet wheel 19 without removing refuse
faster than it accumulates. When two pawls 18
are used half a tooth movement of the ratchet
wheel 18 is possible and this may be employed
to obtain a greater range of operation of the
refuse ejector. For example, the range may then
be from 0 to 21/2 or from 1/2 to 3 teeth. These
ranges are, of course, merely illustrative and
obviously may be expanded or contracted, as
In addition to the mentioned adjustment,
which essentially affects the position and range
of movement of shield 14 and the rate of oscil
15 lation of the bell crank 11, it is necessary to
adjust the screen ‘I, as previously mentioned,
to obtain uniformity in the depth of the refuse
bed over the entire area of the’ screen, as well
as uniformity of the'constituents thereof
20 uniformity in the rate of movement of said
over said screen ‘I. Said screen 1 should be
justed so that the refuse will not tend to
up and then create a “land-slide” but will move
continuously and uniformly. When proper ad
justment of the mechanism is made, as aforesaid,
the withdrawal of refuse is completely automatic.
The gravity of separation of the material may
be adjusted by adding or subtracting washers 62.
An increase in the number of said washers results
30 in an increased gravity of separation.
It is evident that the mechanism of my in
vention for controlling the discharge of refuse
is a very sensitive mechanism, yet it is relatively
rugged and free from parts which may get out
of adjustment. This extremely sensitive mech
anism has been found to be very effective to
maintain a relatively constant depth of refuse
bed which is necessary for consistent jigging con
ditions and an ultimate clean separation of coal
and refuse. Every effort is made _to reduce the
mass of the moving parts which move in unison
with the ?oat 3‘! and to reduce any frictional
surfaces which might tend to reduce the sensi
tivity thereof. In addition, as has‘ been above
pointed out, the particular shape of the ?oat 31
is a very important feature of my invention.
In the operation of the jig, raw coal will be
fed to the chute 5 and fall through the jigging
liquid to the screen ‘I, forming a bed of mate
rial. The cyclic ‘upward and downward move
ment of the jigging liquid through the screen 1
will stratify the bed of material with the high
gravity refuse on the bottom and the coal on
top. During this stratifying action the bed will
be cyclically expanded and contracted to perfect
the stratification. The ?oat 31 will act much
like a large particle of material and, particular
ly as it is totally submerged, will be Strati?ed in
the bed according to its size and weight. These
qualities are so determined that said ?oat 31 will
be Strati?ed on top of the refuse bed, and within
and at the bottom of the‘ bed of coal. The ?oat
31 thus does not truly ?oat on the liquid surface
‘ but is actually stratified on top of the refuse bed.
65 As a consequence the ?oat 31, acts as a very
accurate device to determine the depth of the
refuse bed and to control the described refuse
ejector mechanism to maintain the refuse bed
of‘ substantially constant depth, thus insuring
too shallow the ?oat comes to rest at a lower po
sition and decreases the rate of operation of said
discharge valve
After the highest gravity refuse is removed
from the ?rst compartment 3 the material passes
over weir 35 into the second compartment 4'
where the intermediate gravity refuse is removed
in a manner similar to that above described.
The float.mechanism is adjusted, by means of
washers 62, to reduce the effective weight of the
?oat 31 in said compartment 4 over what it'
was in compartment 3 so the ?oat 31 will properly
stratify on top of the intermediate gravity refuse.
The clean coal passes from compartment 4
over the chute 6 to be treated as a ?nal clean
coal product.
While in the description given the apparatus
was described as particularly useful for clean
ing coal, for which it is primarily designed, it
may also ?nd other useful fields of application. 20
Obviously those skilled in the art may make
various changes in the details and arrangement
of parts without departing from the spirit and
scope of the invention as de?ned by the claims
hereto appended, and I wish therefore not to
be restricted to the precise construction herein
Having thus described and shown an embodi
ment of my invention, what I desire to secure
by Letters Patent of the United States is:
1. In a separator, the combination with. a ma
terial support, of means for controlling the depth
of refuse on said support comprising, a rotary
refuse discharge valve, a ratchet wheel adapted
to operate said valve, a pawl for operating said ,
wheel, means for reciprocating said pawl, a shield
for determining the extent of movement of said
ratchet wheel during each reciprocation of said
pawl, means for adjusting the position of said
shield comprising a totally submerged elongated .
?oat having a pointed back whereby material
will not tend to accumulate thereon and having a
relatively ?at rounded bottom to rest on said
refuse bed, and mechanism for connecting said
?oat and said shield including non-friction
mountings, whereby said ?oat will control said
2. In a jig, the combination with a screen, of
means for maintaining a uniform depth of refuse
on said screen comprising, a rotary discharge
valve, a ratchet wheel for rotating said valve, a
lever, means for'reciprocating said lever, a pawl
carried by said lever adapted to engage said
ratchet wheel, a shield adapted to determine the
extent of rotation of said ratchet wheel for each
reciprocationof said lever, a totally submerged
?oat having a sharp top and adapted to indicate
the depth of refuse on said screen, linkage mech
anism connecting said ?oat and shield including
a’ lost motion connection whereby said shield
assumes a position determined by the‘ average
positionof said ?oat, and means to balance said ,
shield whereby it will remain in any adjusted
3. In a separator, the combination with a ma
terial support, of means for stratifying material
on said support to form a bed of refuse, means
for discharging refuse including a rotary valve,
a ratchet wheel for rotating said valve, a lever,
means for reciprocating said lever, a pawl car
ried by said lever adapted to ‘engage said ratchet
substantially uniform conditions of treatment
for the raw coal with resulting uniform results.
That-is, if the refuse bed tends to become too . Wheel, a shield constructed and arranged to de
deep the ?oat comes to rest at a higher position termine the extent of rotation of said ratchet
wheel for each reciprocation of said lever, a to
and'increases the rate of operation of the dis
tally submerged ?oat having a sharp top and
2, 132,380
constructed and arranged to position itself in
accordance with the depth of said refuse bed,
and linkage mechanism connecting said ?oat
and shield including a 10st motion connection
whereby said shield assumes a position deter
mined by the average position of said ?oat.
4. In a separator, the combination with a. ma
terial support, of means for controlling the depth
of refuse on said support comprising, a discharge
10 valve of the rotary type, pawl and ratchet means
for rotating said valve, a shield cooperating with
said pawl and ratchet means to determine the
extent of movement of said valve, means for ad
justing the position of said shield comprising
an elongated totally submerged ?oat having a
pointed back whereby material will not tend to 5
accumulate thereon and having a relatively ?at
rounded bottom substantially devoid of comers
adapted to rest on said refuse bed, and mech
anism for connecting said ?oat and shield where
by said ?oat will control said shield.
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