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Патент USA US2290315

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July 21, 1942.
cc. CLINE ET AL
2,290,315 '
BUCKET DREDGE
Filed April 5, 1940
3 Sheets-Sheet l
Fi‘igij '
1.2
I!
in_
//7///1
INVENTORS
Charles C. CIz'ne
Leon P. Pz'c‘ard
BY
.MI; W22’
ATTORNEYS
July 21, 1942;
c. c. CLINE ET AL
2,290,315 ‘
BUCKET DREDGE
Filed April 5, 1,940
3_ ‘Sheets-Sheet 2
’
INVENTORS‘
Charles, C.’ Cline
"
_
LeonR-Pz'card
5Y
ATTORNEYS
-
Julyizl, 1942-
v
c. c. CLINE ETAL
BUCKET DREDGE
’
Filed April 5, 1940'
111131.3-
'
2,290,315
s‘sneeis-sheet s
,5_
INVENTOR_S
Charles C._.CZ‘me
Leon P. Pzcard
‘MMATTORNEYS
Patented July 21, 1942
2,290,315
UNETED STATES PATENT OFFlCE
2,290,315
BUCKET DREDGE
Charles C. Cline and Leon P. Picard,
Oamanche, Calif.
Application April '5, 1940, Serial No. 327,974
6 Claims.
(Cl. 209-247)
This invention relates to gold dredgers of the
endless bucket-line type. In these dredgers, the
buckets dig the gravel, etc., from below water
level, elevate it some distance, and then dis
acters of reference on the drawings, the conven
tional dredger includes an endless chain I on
which is mounted a line of digging buckets 2.
The line extends some distance above the deck 3
charge it into a hopper or chute which conveys
it to a screen or other device for separating and
recovery of the values in the gravel.
of the dredger and at the top passes over a di
rection changing sheave 4, so that the buckets
as they turn about the sheave from in front be
come inverted. With such invention, the mate
rial in the buckets discharges into a chute 5 lead
The discharge of the material from the buckets
is of course accomplished when the buckets be
come inverted as they pass about the top sprocket
of the endless chain on which the string of
buckets is mounted, and while the hopper catches
the bulk of the material from the inverted
buckets, a certain percentage is unavoidably
ing to a downwardly sloping screening device 6.
Such of the material as inevitably spills be
tween the buckets and chute is caught by a plate
1 which extends downwardly from chute 5 to the
deck Well 8 through which the bucket line passes
back into the water.
The above construction is standard, and we
do not alter this general arrangement in any
way in applying my novel structure thereto,
except that the usual grizzly is replaced by the
I spilled between the hopper and the lip of the
buckets.
Various devices have been used in an endeavor
to catch this spilling material which otherwise
drops back into the deck well and thence sinks
-to the bottom, but such devices have proven
somewhat inefficient and have only been able to
catch a relatively small percentage of the spilled
material.
The principal object of our invention is to elim
inate this ine?iciency in operation by the provi
sion of a device which will positively catch prac
unbroken plate 1 as shown. Such structure com
prises a concentrator in the form of a rotary
cylindrical screen or trummel disposed behind or
rearwardly of the plate 1 under and substantially
parallel to screen 6, and relatively small as com
The trummel comprises non
perforate end sections 9 with screen sections l0
25 pared therewith.
tically all of the spilled and otherwise Wasted
material, and will deliver the same to an auxil~
iary screen for the recovery of any values there
in.
It has in fact been proved that the use of 30
my device on a dredger, replacing previous de
vices for the same purpose, results in an increase
therebetween, and while the screening is here
shown conventionally, it is preferably formed of
perforated plate, tied to the end sections by 1on
gitudinally extending ribs or bars H.
The forward section carries a track band l2 en
gaged by supporting rollers [3, as is common
of 5% and up of the total values recovered. We
practice. some distance beyond the rear end of
have also provided what we believe to be certain
the trummel is a tubular stub shaft M, disposed
novel features of construction and mounting of 35 axially thereof, and rigidly connected to the rear
the auxiliary screen.
section 9 by arms P5. The shaft turns in a bear
A further object of the invention is to produce
ing box It mounted for swivel movement in a
a simple and inexpensive device and yet one
vertical plane on supporting brackets H. In this
which will be exceedingly effective for the pur
manner, the trummel can yield without binding
pose for which it is designed.
40 at any point in the event that any gravel, etc.,
These objects we accomplish by means of such
should temporarily get between the track band
structure and relative arrangement of parts as
and rollers.
will fully appear by a perusal of the following
A bevel gear I8 is mounted on shaft M at its
speci?cation and claims.
rear end, and is engaged by a driven bevel pinion
In the drawings similar characters of refer
19 disposed to one side of the gear.
ence indicate corresponding parts in the several
A stationary spray pipe 20, connected to a
views:
source of supply under pressure, extends length
Figure 1 is a side elevation of our auxiliary
wise through the trummel near the top, and then
screen and feed structure, shown in association
de?ects toward the shaft It and passes through
with the bucket line and main screen unit of a 503 the same, terminating beyond the shaft in a
dredger, the latter features being illustrated
downwardly depending portion 28 having a nor
somewhat diagrammatically.
mally closed valve 22 therein for clean-out pur
Figure 2 is an enlarged sectional elevation of
poses. T’he pipe is suitably supported adjacent
the auxiliary screen unit.
'
the forward end of the trummel as at 23, and
Figure 3 is a transverse section on line 3-3
also rearwardly of shaft M by a bracket device 24.
of Fig. 2.
Fine material passing through the screening I0
Figure 4 is a fragmentary front view of the
falls into a rif?e sluice 25 leading readwardly a
grizzly plate of the dredger showing the catch
and feed-in hopper for the auxiliary screen.
Referring now more particularly to the char
certain distance beyond the trummel, said sluice
having upstanding Wings 26 along the portion
60 thereof directly under the screening. A water
2
2,290,315
feed pipe 21 preferably delivers into the sluice
at its head end. The pipe portion 2| also dis
mechanism to divert into the latter that spillage
from the buckets which falls between said reach
charges into the sluice.
The large waste material passing out through
plate of substantial width extending downward
and said chute; said means comprising a solid
some distance from the upper end of the chute in
substantial parallelism to said forwardly sloping
erally extending chute or apron 28 disposed above
reach but in clearance relation to the inverted
sluice 25 and delivering into another sluice 29
buckets thereon, said plate having an opening
which leads forwardly and discharges into the
therethrough communicating with said other
well 8.
Material is delivered into the front end of the 10 mechanism, and de?ector members mounted on
the face of said plate and projecting toward said
trummel by an open front hopper which includes
reach, said members being operative to de?ect
a mouth portion 30 projecting through the plate
through said opening substantially all said spill
1 from in front of the same and thence into the
age ?owing down the plate from above said
trummel, and side wings 3| ?aring upwardly from
the hopper in front of the plate to a termination 15 opening
3. A structure as in claim 2 in which said de
adjacent the side edges thereof, some distance be
flector members are arranged to form a hopper,
low chute 5, so as to be then spaced apart a dis
said hopper being open on top and at the front;
tance greater than the width of buckets 2. In
said opening communicating with the bottom of
practice, the plate is cut away for an area out
the hopper.
lined by the wings and adjacent portion of the
4. In a dredge which includes an endless buck
hopper mouth, and a back plate 32 is disposed
et line having a downwardly moving reach dis
between the wings having a rearward slope to the
posed at a forward slope, the buckets on said
mouth relative to the plate ‘I, so as to increase
reach being inverted, a chute disposed with its
the width of the wings and thus provide a large
material catching area without having them 25 upper end adjacent but clear of the upper portion
of said reach and its supported buckets, said
project far enough in front of the grizzly plate
chute being in position to catch material initial
to possibly interfere with the buckets. In this
ly discharged from the buckets upon inversion
manner, any and all material discharged from
thereof, a values recovery mechanism into which
the buckets and not deposited in the chute, is
the chute discharges, another values recovery
caught by the wings and portion 39 and delivered
mechanism on the dredge below said chute, and
to the auxiliary screen.
'
means intermediate said chute and said other
The apron 2B is preferably provided with per
mechanism to divert into the latter that spillage
forations 23a over the chute 25, so that relatively
from the buckets which falls between said reach
small matter with the large waste material on
and said chute; said means comprising a solid
said apron may drop down into chute 25.
plate of substantial width extending downward
It is to be noted that plate ‘I is actually a spe
some distance from the upper end of the chute
cial one, replacing the usual perforated grizzly
in substantial parallelism to said forwardly slop
plate or grizzly bars sometimes used, as previously
ing reach but in clearance relation to the inverted
stated.
buckets thereon, said plate having an opening
From the foregoing description it will be read
therethrough communicating with said other
ily seen that we have produced such a device as
the rear end of the trummel is caught by a lat
substantially ful?lls the objects of the invention
mechanism, and an open front hopper formed
as set forth herein.
with said plate and. into which hopper said spill
age ?ows from the plate, said hopper including a
While this specification sets forth in detail the
present and preferred construction of the device, 45 lower mouth portion projecting through said
opening from a point in front of the same and
still in practice such deviations from such detail
may be resorted to as do not form a departure
delivering at its rear end into said other mecha
from the spirit of the invention, as de?ned by the
nism, and divergent wings on the plate project
ing upwardly from the sides of the mouth por
appended claims.
' Having thus described our invention, what we 50 tion to a termination at points spaced apart a
greater distance than the width of the buckets.
claim as new and useful and desire to secure by
Letters Patent is:
1. A concentrator comprising a rotary screen
5. A structure as in claim 4 in which the hop
per includes a back plate between the wings ex
ing unit, a frame structure, rollers mounted on
tending downward from adjacent the top of the
one end, a stub shaft ?xed in axial connection
with the opposite end of the unit, a bearing in
which said shaft is turnable, lateral trunnions
to the mouth portion rearwardly of said solid
said structure and supporting the unit adjacent 55 wings and at a rearward slope to said solid plate
plate.
6. A concentrator comprising a rotary openend
ed screen unit, means freely supporting the unit
bers ?xed on the frame structure in which said 60 at one end, a tubular stub shaft ?xed in axial
connection with the opposite end of the unit, a
trunnions are turnable,
bearing for said shaft, means mounting said
2. In a dredge which includes an endless buck
bearing for swivel movement in a vertical plane,
et line having a downwardly moving reach dis
and a stationary spray pipe passing through the
posed at a forward slope, the buckets on said
reach being inverted, a chute disposed with its 65 unit from end to end, and through the stub shaft
axially; the internal diameter of said tubular stub
upper end adjacent but clear of the upper por
projecting from said bearing, and bearing mem
shaft being substantially greater than the outside
diameter of the corresponding portioin of said
spray pipe to permit of said movement of the
thereof, a values recovery mechanism into which 70 bearing to a limited extent without obstruction
by said corresponding portion of the spray pipe.
the chute discharges, another values recovery
CHARLES C. CLINE.
mechanism on the dredge below said chute, and
LEON P. PICARD.
means intermediate said chute and said, other
tion of said reach and its supported buckets, said
chute being in position to catch material initial
.ly discharged from the buckets upon inversion
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