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Патент USA US3068730

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Dec. 18, 1962
B. F. DlRZlUS
HOLLOW DRILL SHARPENER
Filed Dec. 14, 1961
3,068,720
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3,068,720
Patented Dec. 18, 1962
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within which is rotatably mounted adjusting ring 27 hav
3,068,720
ing interior screw threads 28, to receive screw threads 29
HOLLOW BREL SHARPENER
on hollow microguide bushing 30.
Bennie F. Dirzius, 1425 S. 52nd Ave., Cicero, lll.
Filed Dec. 14, 1961, Ser. No. 159,230
4 Claims. (Cl. 76-82)
My invention relates to a Sharpener for a drill in the
Such drills
form of a hollow tube with an open top.
Adjusting ring 27 has spaced graduations in thou
sandths of an inch with markings. Microguide bushing 30
has an end portion 31 which is not screw threaded, and
which extends beyond housing 10. Bushing 30 has a
key way 32 engaging pin 33 in body portion 11 to pre
used for cutting holes in paper have top edges that fre
vent undesired rotation.
A holder 34 has a spindle 35 for receiving the hollow
quently must be sharpened.
10
drill or tube tool 17 to be sharpened, and suitable means
Heretofore, Sharpeners for such hollow tube drills cre
ated rough top edges with burrs. It was then necessary
for removable attachment of the tube tool thereto. Said
holder 34 has a drive disc 36 attached to one end of
to remove these rough edges and burrs by a honing oper
spindle 35. Handle 37 is attached to disc 36.
ation. This often resulted in uneven edges, increased
In sleeve 13 an opening 38 is provided communicating
wear, breakage, and replacement with delay and added
with hole 39 in housing 10 to permit the chips cut off
cost.
from the tube tool during the sharpening, to fallout.
It is among the objects of my invention to solve these
In use, the user turns adjusting ring 27 to the gradu
problems and remove these objectionable characteristics;
to provide a Sharpener with a bushing for supporting the
ation determined for the desired amount of removal of
metal from the tube tool to be sharpened. The user
hollow tube being sharpened immediately back to the
sharpened edges so as to prevent the metal from bend
then grasps disc 36 and inserts the tube tool to be
ing over and forming burrs, thereby eliminating the
secondary honing operation; to supply a Sharpener that
will insure razor sharp cutting edges free of roughness;
sharpened held by spindle 35 into guide `bushing 30 until
to create a Sharpener having graduations for control so
that the user may determine in advance how much metal
is to be removed from the tube tool being sharpened, and
to provide a structure for centering the Sharpener and
' the tube tool being sharpened.
My invention contemplates such other objects, advan
tages and capabilities as will later more fully appear and
which are inherently possessed by my invention.
While l have shown in the accompanying drawings a
preferred form of my invention, yet it is to be under
stood that the same is susceptible of modification and
change without departing from the spirit of my inven
tion.
Referring to the drawings, FIG. l 4is a side elevational
view of my hollow drill Sharpener partly in section;
disc 36 abuts the end of bushing 3d. The user then
grasps handle 37 and rotates the assembly until the sharp
ening of the tube tool has been completed.
The hollow drill or tube tool being sharpened is sup
ported by bushing 15 right back of the cutting edge of
cutting member Ztl so as to prevent the bending over of
the metal on the tube tool and the »forming of burrs.
This insures the sharpening of a razor like edge on the tube
tool. There is no need for honing burrs or removing
ragged edges and no delays due to breakage and replace
ment.
Having thus described my invention, I claim:
l. A hollow drill Sharpener comprising a housing hav
ing a bore therethrough, a sleeve mounted in the bore
of said housing, and having a stop means, a bushing
mounted within said sleeve and against said stop means,
said bushing having an opening theretln‘ough, and a
FIG. 2 is an end elevational view on line 2_2 of FIG. 40 countersink communicating with said opening, said
l partly in section; FIG. 3 is an enlarged sectional view
showing the adjusting means; FIG. 4 is a side view of the
cutting member with the sleeve bushing in section; FIG.
5 is a front View of my cutting member; FIG. 6 is a
detailed view of the assembly of the cutting member
and bushing partly in section; FIG. 7 is a detailed view
countersink at a desired angle, a cutting member mounted
in said sleeve and having a single ñute countersink, said
countersink at a different angle than the angle of the
countersink of said sleeve, said cutting member bearing
' against said bushing at one point, a cap for removably
The embodiment selected to illustrate my invention
comprises a housing 1G, preferably of aluminum and having a body portion 11 and a base 12. Extending
closing an end of the bore of said housing, and a holder
for removably holding a hollow drill to be sharpened,
said holder adapted for insertion of the hollow drill to
be sharpened, through and into the other end of the
bore of the housing and through said bushing and against
said cutting member, said holder adapted to be rotated
laterally through body portion 11 is a bore 16 within
so that the hollow drill may be sharpened on the cutting
of the hollow drill to be sharpened; and FIG. 8 is an
end view of the same.
member as it is supported by the bushing immediately
back of the cutting edge of the cutting member during
sleeve 13 is a lock ring 14 which acts as a stop member
for bushing 15. Bushing 15 has a center hole 18 extend 55 sharpening to prevent burring, said sleeve and said hous`
ing having communicating bottom openings for the pas
ing therethrough and a `downwardly and inwardly angled
sage of chips from the sharpened hollow drill.
countersink 19, preferably at a 90° included angle,
2. A hollow drill Sharpener comprising a housing hav
leading to hole 18.
ing a bore therethrough, a sleeve mounted in the bore
My cutting member 20 has a single ñute countersink
21, preferably at an 82° included angle. This included 60 of said housing, and having a stop means, a bushing
mounted within said sleeve and against said stop means,
angle may vary between 68° and 89°. The cutting edge
said bushing having an opening therethrough, and a
of my cutting member 20 is radially relieved. A sleeve
countersink communicating with said opening, said
bushing 22 engages the shank 23 of cutting member 2li
countersink at a desired angle, a cutting member mounted
and extends beyond bore 16. Sleeve 13 extends beyond
in said sleeve and having a single flute countersinl-, said
body portion 11 and is screw threaded to receive and
which is shrunk a sleeve 13, preferably of steel.
In
countersink at a diñerent angle than the angle of the
hold a screw threaded cap 24, which bears against sleeve
bushing 22 so as to hold cutting member 20 against
countersink of said sleeve, said cutting member bearing
bushing 15. Because of the different included angles of
against said bushing at one point, a cap for removably
closing an end of the bore of said housing, a hollow
the cutting member and the bushing, cutting member
20 bears against bushing 15 only at one point, indi 70 micro guide bushing extending into the other end of the
cated in FIG. 6 of the drawing as 25.
Body portion 11 of housing 1t) has a vertical slot 26,
bore of the housing, a holder for removably holding a
hollow drill to be sharpened, said holder adapted for in
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3
4. In a hollow drill Sharpener having a housing with a
bore therethrough, a cutting member and a bushing
sertion of the hollow drill to be sharpened, through and
into said micro guide bushing and through said first men
tioned'bushing and against said cutting member, said
positioned within the bore, said bushing having an open
ing therethrough, a hollow micro guide bushing mounted
in thebore at its opposite end and extending beyond
said housing, a graduated ring rotatably mounted on said
holder adapted to be rotated so that the hollow drill
may be sharpened on the cutting member as it is sup
ported by the bushing immediately back of the cutting
edge of the cutting member during sharpening to prevent
burring, said sleeve and said housing having communi
eating bottom openings for the passage of chips from the
sharpened hollow drill, and an adjusting ring rotatably
microguide bushing and a holder having an outer disc of
larger diameter than said hollow micro guide bushing and
an inner portion for »removably holding a hollow drill to
IO
be sharpened, said inner portion being of smaller di~
mounted on said micro guide bushing for moving the
micro guide bushing a desired distance with relation to
the bore so as to guide the holder with its attached hol
low drill to be sharpened so that a predetermined amount
of the hollow drill will be removed by said cutting mem
ameter than said hollow micro guide bushing and the
hollow drill to be sharpened being of smaller diameter
than the opening in said ñrst mentioned bushing, so that
ber during the sharpening of the hollow drill.
bushing farther away from or nearer to the end of said
housing so that as said outer disc contacts the outer end
3. In a hollow drill Sharpener, a bushing having an
it may extend therethrough to said cutting member, said
ring adapted upon rotation to move said micro guide!
opening therethrough, and a countersink communicating
of said hollow micro guide bushing, said inner portion of
with the'opening, said countersink at a desired angle, a
said holder may so advance within _said hollow micro
cutting member having a single flutecountersink, said 20 guide bushing that its attached hollow drill will advance
through the opening of said ñrst mentioned bushing for
countersink at a different angle than the countersink of
a predetermined amount of removal therefrom by said '
said bushing, the countersink of said cutting member
bearing against the countersink of said bushing at one
cutting member during theV sharpening operation.
point, a holder adapted to removably hold a hollow drill
to be sharpened and guide it through the opening in 25
said bushing and against said cutting member, said bush
ing supporting the hollow drill immediately back of the
cutting edge of the cutting member during the sharpen
ing by said cutting member to prevent -burring.
References Cited in the íile of'this patent
UNITED STATES PATENTS
924,378
2,141,712
Porter ________________ __ June 8, 1909
Gylleck ______________ __ Dec. 27, 1938
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