Hole-Straightener Page: 2 of 3
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UNITED STATES PATENT OFFICE.
HARRY R. DECKER, OF HOUSTON, TEXAS.
Specification of Letters Patent.
Application.filed December 21, 1910. Serial No. 598,654.
To al 'whom it may concern:
Be it knownr that I, HARRY R. DECKER, a
eit izen of the United States, residing at
I houston. in the county of Harris and State
5 of Texas, have invented certain new and
i efulInloveluents in Hole-Straighteners.
of wIlich Iwle following is a specification.
MY in eniticn relates to new and useful
111)impro e\Ie)ts in hole straighteners and
10 more )aIticIlarly to such devices as are de-
sign(d to straighten the bore of an oil or
It is a well known fact that the bit car-
ried hy the drill stein in boring is easily
15 (letlected from a straight course yiv inclined
-4rata, and as variously inclined strata nmay
h encountered the bore when completed
muy follow a zigzagged course, in which
case it is impossible to set a casing in the
20 well. which is as large as the well bore and
sometimes it is entirely impossible to set
the easing by reason thereof.
This invention comprehends an improved
device, carried v the drill stem which is de-
25 signed to cut off all projections jutting out
into the well iore and to straighten said bore
so that the same will readily receive the well
With the above and other objects in view
30 my invention has particular relation to cer-
tain novel features of construction and op-
eration an example of which is given in
this specification and illustrated in the ac-
companying drawings, wherein:-
35 Figure 1 is a side elevation of a drill stem
with the bit attached and provided with the
improved straightener, showing the same in
operation. Fig. 2 is an enlarged. sectional
view of the device showing the projecting'
40 cutters. Fig. 3 is a bottom plan view there-
of. Fig. 4 is an end view of one of the cut-
ters and Fig. 5 is a side elevation thereof.
Referring now more particularly to the
drawings, wherein like numerals of refer-
45 ence designate similar parts in each of the
figures, the numeral I refers to the drill
stem, which is composed of a plurality of
sections, united in a manner hereinafter de-
scribed. This stem carries at its lower end
50 a cutting bit 2 of any desirable form and for
the usual purpose.
The numerals 3 and 4 respectively, refer
to the male and female members of the col-
lar uniting the stem sections. The main
55 portions of these members are of a uniform
diameter but the male member has a reduced
extension 5 whose outer surface is stepped
as shown, to correspond to the similarly
I shaped inner surface of the female member,
within which said extension closely fits. 60
SThesemembers are also inwardly threaded
at the points indicated by the 'numerals 6
and 7 to receive the outwardly threaded
ends of their respective stein sections.
The member 3 is provided with a series 65
of rows, of triangular perforations 8 ;ir-
ranged around said member and designed
to receive-the cutters 9. These cutters are ob-
long members preferably triangular in cross
section so they will have cutting edges, and 70
are so arranged with reference to the direc-
tion of the stem rotation, as indicated by
the arrows in Figs. 3 and 4, that the lower
angles thereof will contact with the surface
to be cut away and become the cutting edges 75
of the cutters. The cutters of each row are
equal in length to the cutterfs of the other
row but the cutters of the upper row project
farther from the stem than those beneath, by
reason of the stepped arrangement of the 80
collar members. as shown in Fig. 2. This
unequal projection of the cutters is desirable
in order that each row may do a portion of
the work and the obstruction be gradually
removed; otherwise, the lower row would 85
remove the entire obstruction . leaving no
portion thereof to be cut away by the cut-
ters of the upper row. These cutters are
first inserted through the perforations 8
from within the' female member of the col- 90
lar and are provided with heads 10 which
bury within the enlarged portions 11 of the
inner ends of perforations 8 so as to be flush
with the inner surface of said member. The
cutters are thus held from passing entirely 95
through said perforations. The male mem-
ber 3 of the collar is then inserted in the
female member and it is to be observed that
the portions of the collar members interme-
diate the rows of cutters as well as on each 100
side thereof are correspondingly threaded
and thus said 'members engage with each
other so as to exclude all water from passing
through said perforations and form a per-
fectly tight joint. The male member rests 105
closely against the cutter heads and oper-
ates to hold the cutters firmly in place.
In reaming out holes of large diameter it
is desirable to use long cutters, in which
case bosses 12 are provided which project 110
Patented I)ec. 3, 1912.
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Decker, Harry R. Hole-Straightener, patent, December 3, 1912; [Washington D.C.]. (texashistory.unt.edu/ark:/67531/metapth510365/m1/2/: accessed February 23, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting UNT Libraries Government Documents Department.