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Патент USA US2129955

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Sept. 13, 1§38.
2,129,955 '
Filed Dec. 30, 1935
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Sept. 13, 1938.
Filed Dec. 30, 1955
2 Sheets-Sheet 2
#51025 w O. OLSON
Patented Sept. 13, 1938
r 2,129,955
I I,
Andrew 0'. Olson, Snohomish, Wash.
Application December 30,1935, Serial No. 56,758‘
2 Claims.
This invention relates to improvements inv rock
handling scrapers, and it has reference more
particularly to what may be termed drag. line
rock scrapers, and which are of a character ‘de
signed particularly for use in‘ placer mining op
erations, although not to be limited to such'use.
It is the principal object of this invention to
provide a drag line rock scraper particularly
suited to placer mining operations in that it may
10 be used after the fashion of the ordinaryv drag
line bucket, and whereby the earth adjacent a
cut that is being made in a sluicing operation
may be dragged into the cut to permit the “pay
dirt” to be Washed out and whereby the heavy
15 rock that is dragged in with the “pay dirt” and
which is detrimental to the sluicing operation,
may be removed.
Explanatory to the present invention, it will
here be stated that in placer mining operations
20 and in sluicing a cut, it is now the common prac-
(01. avg-1.20)
interfere with the sluicing operation in the cut
and which provides also .that all “pay dirt”'that
is dragged into the cut by the scraper may eas
ilyvand'readily be Washed out as’the scraper is
held suspended over the out or over the sluicing 5
box, and. the larger rock will be retained and
may be discharged onto a dump at some point
remote from the cut.
Other objects of the invention reside in the
details of construction and in the combination 10
of parts, and in the novel method involved in
the use of the device, as will hereinafter be de
scribed, and pointed out in the claims termi
nating the speci?cation.
In accomplishing thesev and other objects of 15.
the invention, I have provided the improved de
tails of construction, the preferred forms of
which are illustrated in the accompanying draw
ings, wherein
“Fig. 1 is a side view of a rock scraper embodied 2O
tice to convey the earth from opposite sides
thereof into the cut from which it is washed
by the present invention.
' Fig. 2 is a side View showing the bucket in its
into the sluice box. This conveying of earth
has been accomplished in various Ways, both
suspended position and' illustrating the opera
tion of washing the dirt from the scraper while
the heavy rocks are retained.
Fig. 3 is a top, or plan view of the device, as
seen in Fig. 1.
Fig. 4 is a lower end View of the scraper.
Referring more in detail to the drawings—
The present rock scraper comprises a plurality of heavy, substantial hooks l arranged in
spaced, parallel planes across the width of the
scraper. All the hooks are transversely alined
and the shank portions la thereof, which are
substantially straight, are rigidly joined by a
back plate 2 that is secured to the shank in any
suitable manner, such as by welding, and which
plate serves to close the back side of the scraper
bucket thus formed. The lower end portions lb
of the hooks form the bottom of the bucket and
each hook is equipped‘with a digging tooth 3
25 manually and mechanically. The dimculty heretofore encountered in the use of ordinary types
of drag buckets resides in the fact that these
buckets do not provide for segregating the heavy
rock from the‘ “pay dirt”. For instance, when
30 it is desired to remove rock from the cut with
the bucket, the bucket also takes with it a cer-
tain amount of the “pay dirt”. Also, when earth
is dragged into the out, there is no Way of segregating the rock from the “pay dirt” and, as
35 a consequence, the sluicing operations are
greatly hindered for the reason that heavy rock
in the cut retards the washing of the “pay dirt”
into the sluice box.
In view of the above, it has been an object of
40 the present invention to provide a novel form
of drag line rock scraper that is formed by a
plurality of spaced, parallel drag hooks having
their shank portions rigidly joined together by
a back plate, thus providing a form of drag line
45 bucket wherein the back portion is closed by the
plate while the base portion comprises only the
spaced hooks between which the loose dirt and
small rocks may readily pass, while the larger
secured in the hook end by suitable means. The
hooks that are at the extreme opposite sides of
the bucket have web plates 5 across the curved
base portions, as shown in Figs. 1 and 4, thus to 45
partially close the sides of the bucket.
Interposed between the end portions of the var
ious hooks are spacers 6 of tubular character, and
rocks may be retained therein for removal from ‘ a continuous rod 1 is extended through the hooks
to the cut.
It is a still further object of the invention
to provide a drag line rock scraper that may be
manipulated in the same manner as the present
day line bucket, and which may be drawn along
55 the sluicing cut to pick up the large rocks which
and through the spacers, thereby to rigidly unite 50
all of the hooks. The ends of the hooks, as will
be noted in Fig. 1, extend forwardly, substantially
parallel with the shank portions la, thus to in
sure retaining a substantial load when the bucket
is lifted.
As a means of handling the scraper, it is
equipped with a surrounding frame of channel
iron. This comprises opposite side beams 8 and
8' and a base. beam 9 across the bottom of the
bucket permanently secured to the hooks. The
forward, or upper ends of the beams 8-8’ are
united by ?sh plates ID with the upper ends of
The mode of operating the bucket through the
mediacy of cables 2| and 26 is well understood by
those familiar with the handling of drag line
buckets, and since this is not a part of the pres
ent invention per se, it will not be further de
Scrapers of this character have proven to be an
the shanks of the hooks, and a cross beam H is
economical means of removing rock, particularly
the hooks and this is rigidly secured to the frame
derstood that it is not the intention that the
disposed transversely across the shank ends of v in mining operations.
structure at a medial point by the brace ,mem
bers I2‘and at the ends by the brackets ‘I3, as
shown best in Figs. 1 and 4.
. i ,
However, it is to be un
scraper be con?ned in its use to mining opera
tions. ‘Such scrapers may be made in various
sizes, and in various widths, and the hooks there
Drag chains I4 and I4’ are secured to the for-‘ ' ‘of'may be located at such spacing as will best suit
ward or upper end of the bucket at opposite sides
15 and are extended forwardlyto a clevis I5.
the vparticular purpose to which the bucket is to
be put.
The particular advantage to be gained by this
there are supporting chains l6 and [6’ attached
to the opposite sides of the bucket by pivotal con- 7 type, of scraper is that the “pay dirt" may be eas
nection I‘! with brackets I8, which, in turn, are ily and readily washed therefrom while all heavy
secured to the beams 8 and 8’. The upper ends - rock is retained and may be removed thereby from
20 of the chains I6—l6’ connect with a pulley block
the sluicing cut.
Having thus described my invention, what I
20 to which a hoist line 2| is pivotally attached.
Also, a line 22 is secured to the clevis, and passes claim as new therein and desire to secure by Let
over the pulley block 20 and downwardly, and is ters Patent is
1. A rock scraper of the character described,
pivotally attached,‘ ‘ as at 25, to the transverse
comprising a frame structure equipped for at
beam H at a medial point. A drag line 26'is at
tachment to operating lines, a plurality of drag
tached to the clevis, and this line and the line 2|
hooks ?xedin the frame, transversely aligned and
are extended to the power devices which oper
in spaced relation, and a cover plate, secured
ate the scraper.
Assuming that the scraper is so constructed, it across the shank portions of the hooks and clos
30 is apparent that in the position of Fig. 1, it may
ing only the back portion of the bucket formed
be dragged along the ground; for instance, along thereby and an operating line whereby the bucket
the sluice chanel, and when so drawn, the teeth maybe held in suspended position.
2. A device as recited in claim 1, wherein the
will dig into the ground, and the bucket will be
hook portions proper of the hooks are curved to
?lled with the rock and dirt. In the usual oper
35 ations, the bucket is lifted and held suspended dispose their end portions substantialy parallel
over the channel that is being sluiced’or over the with the shank portions of the hooks, and where
sluice box, and water from a hydraulic nozzle 30 in the hooks at the outside have webs applied to
is discharged into the bucket as illustrated in Fig. the hooked ‘bases to partially close the sides of
2. This washes all of the “pay dirt” from the the bucket formed by the hooks.
scraper, but the scraper retains the heavy rocks,
which are then conveyed out of the way and
dumped‘ from the scraper.
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