Improvements in Drills.
Year: 1899

page_text: I, ERNEST KUINE, of 2497, Eighth Avenue, New York City, N.Y., U.S.A.,
Cabinet Maker, do hereby declare the nature of this invention to be as follows:-
This invention has for its object the provision of a drill which will cut cleaner,
more truly and expeditiously that the common twist drill.
A drill constructed in accordance with my invention comprises a shank having
a conical head having backed off spiral cutters with an inclined upper edge.
Concentric ribs and upwardly opening spiral surface grooves are formed above
the cutters. A tube is passed over the ribs and has a lower serrated edge which
engages the inclined upper edge of the cutters. The tube may be kept in place
by means of a small screw.
Dated this 6th day of February 1899.
P. R. J. WILLIS,
Agent for Applicant.
Improvements in Drills.
I, ERNEST KUHNE, of 2497, Eighth Avenue, New York City, N.Y., U.S.A.,
Cabinet Maker, do hereby declare the nature of this invention, and in what man-
mer the same is to be performed to be particularly described and ascertained in
and by the following statement: -
This invention relates to a drill more particularly designed for boring or dril-
ling into the soil for the removal of earths and minerals.
The drill is comprised of a spiral drill-head of peculiar construction, which is
securely fitted into the drill tube and discharges the borings directly into such
tube by means of grooves formed between the cutting blades. To prevent the
drill-head from working loose under lateral strain, the tube terminates in a ser-
rated lower edge which is engaged by the upper inclined edges of the cutters on
the drill-head.
In the accompanying drawings, Figure 1 is a side elevation of my improved
drill: Fig. 2 a perspective view of the lower end of the drill tube; Fig. 3, a side
view of the drill head; Fig. 4, a top view thereof; Fig. 5 a section on the line
5-5, Fig. 3: Fig. 6a longitudinal section of the lower end of the drill tube,
showing head inserted; and Fig. 7, a cross section on line 7-7, Fig. 1.
The letter a represents the drill head, which is preferably composed of tem-

page_text: pered cast-steel and is of conical shape. Within the surface of the head are
formed a number of spiral grooves a¹, that extend to and open at the top of the
head and gradually increase in width from the drill point upwardly. The spiral
cutters a, between the grooves q, are backed off, so that a bit is formed along
one of their edges. At its upper end each cutter a terminates in an inclined
edge and above such end the cutters are reduced in diameter and made con-
centric to form the ribs a. These ribs fit into the boring tube b and are attached
therein by screws c or otherwise.
The bottom of the tube is serrated, as at ¹, the serrations extending in a
direction opposite to that of the cutters a². These serrations are engaged by the
inclined upper edges a³ of the cutters, and in this way the transverse strain to
which the cutter head is subjected will not be apt to wrench the head off its
fastening, because such strain will force the upper edges of the cutters a² against
the serrations b¹.
The grooves a extend to the upper end of the ribs a, Fig. 6, and will conse-
quently form ducts in the overlapping portion of the head, that convey the bor-
ings directly into the interior of the tube b.
The tube is provided with a suitable discharge orifice and carries on its
top a cap d, adapted to be coupled to a boring rod, by means of which a rotating
motion may be imparted to the drill in suitable manner.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1
(1) A drill composed of a conical head having backed off spiral cutters, con-
centric ribs above the cutters, and upwardly opening spiral surface grooves, com-
bined with a tube that overlaps the ribs and into which the upper ends of the sur-
face grooves open, substantially as specified.
(2) A drill composed of a conical head having spiral cutiers with an inclined
upper edge, concentric ribs above the cutters, and upwardly opening spiral surface
grooves, combined with a tube having a lower serrated edge which engages the
inclined upper edge of the cutters and fits over the ribs as specified.
Dated this 2nd day of October 1899.
P. R. J. WILLIS,
Agent for Applicant.