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Патент USA US2122584

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July 5, 1938.
Filed Aug. l, 1936
/QWW ß. ¿uw
Patented July 5, 1938
Matt R. Peck, Gardena, Calif., assignor of one
half to Benjamin E. Bertran and one-half to
Josie A. Bertran, both of Los Angeles, Calif.
Application August 1, 193s, serial No. 93,819
9 Claims.
This invention relates to excavating tools, and
particularly pertains to an under cutting bucket.
In various excavation operations, and particu
larly when concrete footings are to be set in the
ground it is necessary to excavate a bore to re
ceive a 'column of concrete, and it is desirable to
enlarge the size of the excavation at the lower end
of the bore to provide an enlarged footing for
the concrete column. The bore is usually made
0 with some suitable type of'drilling tool and the
enlarged cavity at its lower end may be made
by the use of under kcutting tools or under ream
ers. These structures often are difficult to handle
and'manipulatewithin the bore, and do not al
l CF1 ways insure that the earth which is cut away to
form the enlarged base of the bore may be con
veniently removed. It is theA principal object of
the present invention Yto provide aboring tool
in a rotary table I3 and is therefore driven there- `
by while having vertical movement with relation
thereto. The rotary table may be of any desired
design and is here shown as fitted with a gear I4
engaged by a pinion I5 and driven from a suit- y
able source of supply through a shaft I6. Sus
pended from the rotary table is a guide cylinder
I1 which is supported by an operating rod I8.
The upper end of this rod is fitted with a nut I9
holding it with relation to the table, and at its .10
lower end with a nut or head 20 which extends
through the upper end plate 2| of the guide
cylinder I'l. The lower end of the guide cylinder
I7 is iitted with an end spider 22 having a cen
tral hub 23 therethrough and through which the
drill stem I2 extends. The terminating end of
the drill stem I2 is provided with a transverse
pin 24 carrying rollers 25, one of which is posi
embodying an under cutting bucket in> its con
tioned on each side of the drill stem I2, as par
‘diameter maybe made and an enlarged space
ticularly shown in Fig. 2 of the drawing. The 20
rollers extend into grooves 26 between trackways
20 struction wherebya- straight bore hole of uniform
’created at the bottom of the bore or at any point
along itslength as controlled and manipulated
byV the'operator at the top ofthe bore. The
structure also embodies simple means for Vcatch
ing thev cuttings 'an-d'V permitting the cuttings to
be removed from the bottom of the- bore hole.
' The present invention` contemplates’ the pro
vision ofV a guide cylinder adapted to yextend into
a bore hole as carried by a drill stern. ` Secured to
the lower end ofthe guide cylinder" is an> under
cutting bucket which is articulately connected
theretoior lateral swinging movement, and which
maybe disposed at a desiredangle to the vertical
and thus'held while an under cutting operation
is carried'out’, the bucket carrying blades by
which lthe earth maybe cut and the cuttings
being diverted into the bucket.
-' The invention 'isillustr'ated by way of example
(ol. ass-:74)
inthe accompanying drawing in which:
21 and 28. These trackways are mounted across
the upper end of the under cutting bucket* 29.
The under cutting bucket is substantially cylin
drical and is hinged to the spider 22 of the guide 25
cylinder I'I by suitable hinge 30 mounted at one
edge of the cylinder. By reference to Fig. 1 of
the drawing it will be seen that the lower end
of the bucket is disposed obliquely to its central
longitudinal axis so that the outer swinging por 30
tion of the wall of the bucket is longer than the
inner edge and so that a pointed nose 3| will be
formed. The bottom of the bucket is closed by
two members, one being a bottom plate 32 and
the other being a blade 33. The blade is dis 35
posed at an angle to the plane of the bottom
plate, as particularly shown in Fig. 2 of the draw
ing, so that a throat 34 will occur between the
central edges of the blade and the plate to ac-
’ AFigure 1 is a lview in vertical section and ele
commodate the cuttings created by the advance 40
of the cutting edge 35 of the blade. It will be
vation with parts broken away "and showing the
application ofthe' present invention to a well
understood that the cutting edge 35 occurs on
the center line of the bucket and that a longi
Fig. 2 is a‘ view in vertical'section through the
under cutting bucket as'seen on the line 2-2 of
Fig. `3 is a view in elevation showing the struc
ture with which the present invention is con
cerned as viewed in the direction of the arrow 3
tudinally extending slot 3S is formed through the
side wall of the bucket, one edge of the slot being 45
ñtted with a side cutting blade 3l. This blade
occurs on the long side of the bucket 29 so that it
will assume a downwardly and outwardly extend
ing position to undercut the side wall of the bore
38 and form an outwardly ñaring wall 39 to 50
create a space 40 for the footing which is to be
> Fig. 4 is a'view in transverse section through
the under cutting bucket as seen on the line 4--4
made. At the same time it will be seen that the
cutting edge 35 of the blade 33 will assume a
of Fig. 1.`
substantially horizontal position to cut a ñat floor
4I at the bottom of the bore. The floor plate 32
` Y
Referringmore particularly to the drawing Ill
indicates ay Kelly bar which is preferably square
lin cross section at the lower end of which is a
drill string coupling II by which a drill string or
a -drill bar I2 is4 attached to the Kelly bar.
60 bar VI Il extends _through a conforming square hole
is hinged at 42 to the cylindrical wall of the '
bucket 29 and is temporarily held inits hinged
position by a fastening 43,
In operation of the present invention the struc
ture is assembled substantially as shown in Fig. l so
' . of the drawing. When the bore 33 of the excava
tion has reaehed a desired depth the device may
be liiwered into the bore with the rod Iß supp-ort
tion and to direct the cuttings into the bucket,
and means for releasing the cuttings frogn the
?fl. vA boring tool comprising guide means to ex
tend withinV the bore of ai; excavation, means for
the gear I4 carrying with it'?the Kelly bar llllrand` Y rotating the same, and a'bucket carried 'at the
drill bar i2 which revolves the guide Il nand. lower end of said guide, said bucket being formed .
bucket 29, the Weigîht of the vKelly bar and drill with side-and bottom blades adapted to cut mate
rod tending to force the bucket outwardly on an rial fronrV the bore and deliver it into the bucket,
ing’the bucket, as indicated in dotted lines in
Fig. 1. Thedrill rod I2 may then be rotated by
10 incline, anniY as this is accomplished the handle lill
of ?the rod ¿8 is held so that :as the drill stem I2
is Qiorced downwardly it will act througlg the
rollers 25 and guides 2l to force the; lower end of
the bucket 29 outwardly as it
on its hinge
15 3Q.' As the cutting operation proceeds the blade
3T will cut the inclined face 39 andthe blade 35
articulate means connecting the bucket-¿to the H'
Yguide means, and means operable from the top of
the well :for swinging the bucketrlaterally of the-
longitudinal axis of the guide and the bore to
thereby selectively undeIi-cut the bore.
5. A boring tool comprising aV guide cylinder 15
adapted to extend for a distance within a bored
hole, means supporting the cylinder from the
top of the hole-and by which itmay be raised,
ceeds the Qcuttings'will bef-forced into the bucket isloweredí and rotated, ka drill stem extending 201
ï downwardly and »reciprocating through said cyl
20 and may thereafter be removed as the bucket is
inder', any under cutting bucket pivoted to the
withdrawn from the bore. Attentionis also di
rented to the fact that the cylindrical guide?sleevev flower end of said cylinder and-*operatively con
will cut the horizontal face'fll of the footing space
4U. It will be seen that as this operation pro
I'i‘ bears such a relation to the diameter of the
bore 38 as to stabilize the?bucket
its operation
25 and to »make it possible to move vand swing the
under cutting bucket outwardly and to hold it
so that its cutting blade 37 will be maintained in
Attention is also directed to the fact that f_ur
30 ther cutting of a cylindrical hole may be pre
nected with the drill stein whereby relative move
ment of the vdrill stem 'with relation to the guide
cylinder will cause the under cutting bucket to
swing toward and away from positions of ver;
tical alignment with the cylinder, said bucket
being formed with openings in its wall, and cut- v
ting blades'disposed along one edge of said open
ings whereby rotation of the drill string,.the guide 30
formed after the'original hole has been under- „ sleeve,`> and the bucket will cause the cutting
,Y blades to under cut the excavation bore and de
posit the cuttings within the bucket to be removed
It willithus be seen that the structure here dis
closed is simplev in construction and may be read
ily operated to undercut a bore in an excavation
by the same rotary driving operation mechanism
as is used to form the main bore.
While I have Vshown the preferred form of my
invention as now known to me, itwill be under
stood that various changes might be made in the
combination, construction, and arrangement of
parts by those skilled in the art without depart
ing from the spirit of the invention as claimed.
Having thusA described my invention, what I
.' claim and desire to secure by Letters Patent is:
l. A digging tool comprising driving means, a
.dirt receiving member carried thereby and adapt
ed to swing from a position vertically aligned with
the rotary axis of the digging tool to a position
50 downwardly and outwardly flaring with relation
thereto, a blade on the side oic said dirt receiving
member adapted to cutAan inclined face on the
side wall of the bore within which the digging tool
is operating and to deliver the cuttings into the
receiving member and means operative from the
top or” the well to swing and maintain the dirt
receiving member in cutting and noncutting posi
2. A
tool comprising guide ‘ means
adapted to extend longitudinally within theAbore
of an excavation,` means for rotating the same,
an under cutting bucket hinged to the lower end
of the guide means, means for swinging the under
cutting bucket from longitudinally aligned posi
' tions to angularly disposed positions, and cutting
blades on said bucket to cut walls of the excava
tion and to direct-the cuttings into the bucket.
3. A' digging tool . comprising guide means
, adapted to extend longitudinally within the bore
of an excavation, means for «rotating the same,
an under cutting bucket hinged to-the lower end
of the guide means, means for swingingthe
under cutting bucket from longitudinally aligned
, .n positions to angularly disposed positions, cut-ting
75 blades on said bucket to cut walls of the excava
6. A digging tool comprising, in combination
with a rotary driving rtablaa drill stem operatively
associated therewith and extending downwardly
into a well bore, a guide cylinder slidably mount
ed uponl the drill stem, means supporting the
guide cylinder from the rotary table whereby the 4-0
position of the cylinder with relation to` the drill
stem may be verticallyadjusted, an under cut
tingl bucket substantially cylindrical in section
and normally disposed with its central axis in
longitudinal alignment with theY central axis of
the guide cylinder and hinged to one edge there
of, means operatively connecting said 1bucket with
the drill string whereby relative longitudinal
movement of the guide sleeve and the drill string
will produce swinging movement of the under cut 50
ting bucket, and cutting blades carried by the
under cutting bucket for cutting an under cut»
wall at the bottom of the bore.
7. A boring tool includingguide means tc- ex
tend within the boreY of an excavation, means for
rotating the same, and a bucket pivoted at the
lower end of said guide at one side thereof, sai
bucket provided with cutting blades.
8. A boring tool including guide means tonex
tend’within the bore of an excavation, means for
rotating the same, means for supporting the same
in the excavation, and a bucket pivoted at ,the
lower end of said guide at one side thereof where
by it .will swing laterally with the longitudinal
axis of the guide and the bore, said bucket pro
vided with cutting blades.
9. A boring tool including guide means to ex
tend within the bore of an excavation, means for
rotating the same, means for supporting the same
in the excavation, a bucket pivoted at the lower
end of said guide at one side thereof whereby it
will swing laterally with the longitudinal axis of
the guide and the bore, and cutter means extend
ing from the walls of said bucket.
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