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Патент USA US2257761

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Oct. 7, 1941.
2,257,761
T. R. PAULSEN
WHEELED SCRAPER
Filed Feb. 13, 1959
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INVENTOR,
2cm, W + we“;
ATTORNEYS
‘
Patented ‘Oct. 7, 1941
2,257,761
UNITED vSTATES PATENT OFFICE
2,257,761
WHEELED SCRAPER '
Thomas lh'l’aulsen, South Milwaukee, Wis.,' as
signor to Bucyrus-Erie Company, South Mil
waukee, Wis., a corporation‘ of Delaware
7
Application February 13, 1939, Serial No. 256,089
11 Claims. (01. 37-124)
My invention relates to new and useful im
provements in wheeled scrapers, and more par
ticularly to that type of such scrapers in which
Referring now ‘to Figure l, we see that His
one of the side beams of the frame of my scraper.
I These beams extend to a forward wheel or wheels
the digging edge of the bowl is pivoted with a
(not shown) of any convenient sort, and/or to a
draw-bar (not shown) for attachment to the
closure known as an “apron” capable of holding
tractor which is to pull my scraper.
‘
and carrying a substantial portion of the exca
The frame is supported by wheels l2, preferably
vated dirt. Two subtypes of such scrapers are
respectively illustrated in my U. S. Patent No.
rubber-tired, of which one is shown.
The bowl I 3 is a box-like structure, open at the
2,106,759, issued February 1, 1938, and in the co
pending application of Horace C. Beitzel and my 10 top and front, and provided with a digging blade
it along its front lower edge. The details of this
self, Serial No. 130,933, ?led ‘March 15, 1937, now
blade constitute the principal item of my pres
Patent No. 2,159,045.
ent invention.
'
I have found that,v when digging loose mate
The bowl is pivotedat IS, on two links l6, of
, rial such as dry sand with such scrapers, the sand
which one is shown. Other linkage, of which a
tends to roll over and over in a cylindrical form
part is shown at ll, supports the front of the
with its axis parallel to the digging lip, and to
bowl. The bowl is raised and lowered to its three
. flow out of the open digging end of the bowl just
about as fast as it ?ows in.
positions (digging, carrying, and dumping) by
means of rope l8 and appropriate cooperating
Accordingly it is the principal object of this
~
present invention to provide means whereby the 20 sheaves.
The apron I9 is appropriately pivoted to the
incoming sand is instead distributed well into the
frame, and is raised and lowered by appropriate
bowl and the apron.
means, such as rope 20.
In addition to my principal object, above stated,
For the details of the operation of bowl and
details, which will be readily evident as‘the de 25 apron (which operation forms no part of my
presentinvention except as generically claimed),
scription progresses.
see the copending patent of Beitzel and myself,
My invention consists in the novel parts and in
already mentioned. For an alternative cycle, see
the combination and arrangements thereof,
Patent No. 2,106,759, already mentioned.
which are de?ned in the appended claims, and of
which one embodiment is exempli?ed in the ac' 30 Suffice it to say here that my invention is ap
plicable to any scraper which has a digging bowl
c'ompanying drawing, which is hereinafter par
and cooperating dirt-carrying apron which apron
ticularly described and explained.
opens when the bowl is in its digging position.
Throughout the description, the same refer
Turning now to Figures 3 and 4, it will be noted
ence number is applied to the same member or to
I have worked out a number of novel and useful
similar members.
.
Figure 1 is a longitudinal vertical section of a
35 that my blade 14 has a double curvature as there
shown. That is to say, the ends of the blade are
higher‘ and further forward than its center, and
its’ digging edge is more inclined than its top
edge. The phase “double curvature,” as used by
sand. This scraper is here shown in its digging
40 me, is broad enough to include abrupt changes
position. ~
_
of direction as alternative and equivalent to an
Figure 2 is a transverse vertical section of my
actual curve.
'
scraper, taken along the lines 2——2 of Figure 1.
It is to be understood that, when I refer to the
Figure 3 is an enlarged vertical section of my
scraper embodying my present invention, and
more particularly illustrating the passage of the
, digging lip, taken along the lines 3-3 of Figure 4. ’
ends of my blade as being higher and/or further
Figure 4 is an enlarged forty-?ve degree slant 45 forward than the center thereof, this language
is intended primarily as a means of de?ning the
view of my digging lip, taken along the lines 4-4
curvature- of my blade, and is not to be avoided
of Figure 3.
_
by shearing off any portion-of a blade thus curved.
Figure 5 is similar to Figure 4, except that Fig‘
In fact, in practice, I ‘occasionally do shear off
ure 5 shows merely one end of the blade, and that
this showing is the variant which omits the for 50 the forwardly projecting lower corners, in a
transverse vertical plane, as for example as shown
wardly projecting corners.
at 25 in Figure 5. This shearing-o? can, of
It should be noted that the representation ofv
course, occur either before or after any part of
the dirt in Figures 1 and 2 represents ?ow-lines,
the bending is done.
1
rather than the actual condition of the dirt at
55 ‘ By virtue of the double curvature of my blade,
any given instant.
-
2
2,257,761
ly upwardly and centrally, as slillown at 2| in Fig
thereof longitudinal of the machine is more near
ly horizontal adjacent its digging edge than ad
ure 1, whence it spills over as shown at 22 and
jacent its upper edge.
23, well back in the bowl and apron respectively,
instead of merely rolling up in front of the dig
ging edge as in the prior art. An additional func
tion of this double curvature is that it directs the
excavated material away from interference by the
3. In a dirt-digging scoop, the combination of:
a digging bowl; a dirt-carrying front apron, occu
sists in ?rst bending a long narrow piece of plate
metal cylindrically about a longitudinal axis in
dicated by the point 24 in Figure 3, and then
bending it cylindrically as indicated in Figure 4,
that a vertical section thereof longitudinal of the
machine is more nearly horizontal adjacent its
digging edge than adjacent its upper edge.
the dirt as dug is directed substantially vertical
pying a position above and forward of the bowl
when the bowl is in digging position; means to
support the bowl and apron from the ground; and
a digging blade, at the front lower edge of the
sides of the bucket and the apron, as shown in
Figure 2.
10 bowl, and having such conformation that the
ends of the blade lie higher than its center, and
The method of making my particular blade con
4. A blade for a dirt-digging scoop, comprising
a long narrow substantially rectangular piece of
plate metal, having a double curvature, being
sentation would lie off the top of the sheet of
curved cylindrically about an offset longitudinal
drawings.
axis and about an offset transverse axis, whereby
Either before or after bending, preferably the
former, it should be sharpened as indicated in 20 it has such a conformation that, when inclined
about an axis not shown, inasmuch as its repre
Figure 3.
_
Having now described and illustrated one form
of my invention, I wish it to be understood that
my invention is not to be limited to the speci?c
form‘ or arrangement of parts hereinbefore de
scribed and shown, except insofar as such limi
tations are speci?ed in the appended claims.
This application is a continuation, as to all
slightly backward, the ends of the blade lie higher.
and further forward than its center, and having
a sharp lower long edge. _
5. A blade for a dirt-digging scoop, according to
claim 4, having the ends of its sharp long edge
recede toward its non-sharp long edge.
6. A digging blade for a dirt-digging scoop, be
ing long and narrow, and being curved about an
axis parallel to its shortest dimension, and also
common subject matter, of my copending appli
cation, Serial #194,276, ?led March '7, 1938, for 30 being curved in its sections cut by planes parallel
to that axis, its long edges lying in planes per
improvements in wheeled scrapers, which appli
pendicular to that axis. '
cation will now be permitted to lapse without
7. A digging blade according to claim 6, having
prejudice, in view of its supersession by this pres
one of its long edges sharpened.
'
ent application.
8. A digging blade fora dirt-digging scoop, be
I claim:
ing long and narrow, and being curved about an
1. In a dirt-digging scoop, the combination of:
axis parallel to its shortest dimension, its long
a digging bowl; a dirt-carrying front apron, oc
edges lying in planes perpendicular to that axis,
cupying a position above and forward of the bowl
the blade being also curved about an axis per
when the bowl is in digging position; means to
support the bowl and apron from the ground; and 40 pendicular to the ?rst axis.
9. A digging blade according to claim 8, having
a digging blade, at the front lower edge of the
one of its long edges sharpened.
bowl, and having such a conformation that the
10. In a dirt-digging scoop, the combination of:
ends of the blade lie further forward than its
a digging bowl; a dirt-carrying front apron, oc
center, and that a vertical section thereof longi
tudinal of the machine is more nearly horizon 45 cupying a position above and forward of the bowl
when the bowl is in digging position; means to
tal adjacent its digging edge than adjacent its
support the bowl and apron from the ground; and
upper edge.
a digging blade according to claim 6.
2. In a dirt-digging scoop, the combination of:
11. In a dirt-digging scoop, the combination of:
a digging bowl; a dirt-carrying front apron, oc
cupying a position above and forward of the bowl 50 a digging bowl; a dirt-carrying front apron, oc
cupying a position above and forward of the bowl
when the bowl is in digging position; means to
when the bowl is in digging position; means to
support the bowl and apron from the ground; and
support the bowl and apron from the ground;
a digging blade, at the front lower edge of the
and a digging blade according to claim 8.
bowl, and having such a conformation that the
THOMAS R. PAULSEN.
ends of the blade lie higher and further for 55
ward than its center, and that a vertical section
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