Improvements in Machines for Sharpening Drills.
Year: 1896

page_text: Date of Application, 6th June, 1896
Complete Specification Left, 29th Jan., 1897-Accepted, 6th Mar., 1897
PROVISIONAL SPECIFICATION.
Improvements in Machines for Sharpening Drills.
I, OLE LARSON, of Wardner, Idaho, U.S.A., Inventor, do hereby declare the nature
of this invention to be as follows:-
This invention is an improvement in machines for sharpening drills, and has for its
object to provide a simple and easily adjusted and operated machine by which to
efficiently sharpen the so called "Burleigh" or "grooved" drills.
The invention comprises a frame or support to hold the guiding and sharpening
device and is provided at one end with guides on which slide a base carrying a vice.
The base is adapted to be reciprocated by a hand lever journalled in bearings
on the sides of the frame and can be adjusted in any position by a ratchet
and pawl.
At the other end of the frame in front of the vice or drill holder is the drill guide
consisting of a disc having a central opening and radiating slots in which projections
are fitted to slide; said projections forming part of suitable movable blocks which can
be moved to or from the centre by the partial rotation of a disc having cam slots
which engage the aforesaid projections.
At the rear of the guide is the sharpening device which consists of a disc having
radial slots in which suitable cutters or bits are arranged so as to meet at the centre
of the disc through which an aperture for the insertion of the drill is provided. These
cutters are pressed inwards towards the centre by springs, but can be pressed more
firmly in that direction by a hand lever attached to a shaft carrying a wheel having
curved spokes which engage projections on the cutters.
In operation, the shank of the drill is held in the vice and its other end or point is
passed through the guide and forced against the cutters which separate to permit the
drill to enter between them. By reciprocating the sliding base the drill is drawn to
and fro between the cutters which sharpen the edges of the drill; the pressure on
the cutters being regulated by the hand lever afore described.
Dated this 5th day of June 1896.
PERCY R. J. WILLIS,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Machines for Sharpening Drills.
I, OLE LARSON, of Wardner, Idabo, U.S.A., Inventor, do hereby declare the
nature of this invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention is an improvement in drill sharpening machines, and has for an object
to provide a simple and easily adjusted and operated machine by which to efficiently
sharpen the so called "Burleigh" or "grooved" drills.
The invention consists in certain novel constructions and combinations of parts, as
will be hereinafter described and pointed out in the claims.
In the drawings,
Figure 1 is a perspective view of my improved drill sharpener. Fig. 2 is a
longitudinal central section of the same.

page_text: transverse section on the nine 33, Fig. 1
Fig. 4 is a face view of the drill guide and holding plates.
Fig. 5 is a view of the reverse side of the cam grooves for releasing the drill
holding pieces.
Fig. 6 is a face view of the plate for holding the bits.
Fig. 7 is a sectional view on the line 7 7, Fig. 2.
Fig. 8 is a detail view of one of the bits, and
Fig. 9 is a detail of one of the holding pieces.
The frame A is adapted to support the holding, guiding and sharpening devices and
is provided near one end with shears .a, on which slides the base B of the holding
devices. This base B slides back and forth on the shears a, and is provided with a
rearwardly-projecting rack-bar b meshed by the toothed pinion journalled in
supports D, one of which has a ratchet segment d engaged by the pawl e so that such
pawl may be readily released. By this lever, rack-segment, and rack-bar the
holding devices may be moved back and forth upon the shears a as will be readily
understood. On the base plate B is mounted the clamp for the drill, such clamp con-
sisting of a fixed jaw F and a sliding jaw F¹ and a screw F2 by which the sliding jaw
may be set to clamp the drill shank.
The drill guide is arranged in front of the drill holder and is provided with a
central opening through which the drill is inserted, such opening G coinciding in
shape with the cross section of the drill and formed to readily receive the same.
This guide also has holding pieces g which are movable toward and from a common
centre and are operated in both directions by a plate G which is provided with
an opening to receive the holding pieces, such opening having its walls at g
formed cam shaped and engaging the holding pieces g in such manner as to force
such pieces inward when the plate is properly turned, and this plate has on its
rear side grooves 92 mado cam-shaped and similar to and so disposed with relation
to the cam faces g¹ that such grooves g2 will tend to move the pieces, 9 outwards,
such pieces having studs or projections operating in the grooves g². A handle G
projects from the plate and permits the same to be swung in one direction or the
other, a detent G³ serving to secure such handle and plate in one position or
the other.
The sharpener proper includes a series of bits movable toward and from a common
centre and holding devices for said bits and means for operating the same.
These
bits H are preferably arranged correspondingly to the wings of the drill, and their
sharpening operation is effected by moving them forcibly from their meeting point
outward. In the construction shewn the bits centre and meet in alignment with
the guide opening G, so that a drill passed through said opening and presses firmly
against the bits will be sharpened by forcing such bits outward to their outer-
most position, causing them to scrape against the points of the wings of the drills.
These bits have portions fitting and engaging with slots i of the face plate I and
springs engage the bits and tend to force the same to their innermost position so
that when at rest the bits will quickly assume such position in readiness for operation
when a drill is inserted. To force such bits outward we provide a hand-lever J fixed
to a shaft J', on which is secured an armed wheel J, the arms of which engage the
portions of the bits in rear of the face plate I and the arms of the wheel J curve or
incline as shewn so that the wheel may be turned to force the bits outward, and that
the tension of the springs I' operating to force the bits inward will also turn the
wheel J to set the same and its operating lever back to the starting point..
In operation a drill such as shewn may have its shank. inserted. and held in the
jaws FF, the head of the drill fitting in the opening G of the guide, and the holding
pieces may be set in upon the wings of the drill, prior to which, however, such drill
should have been forced by proper manipulation of the lever C to cause the point of
the drill to bear firmly against the bits, the drill being held in such place by the detent
pawl e before described. Now by forcibly moving the bits outward, which can be
accomplished by the lever devices before described the drill will be sharpened. By
moving the bits outward to sharpen the drill it will be seen that the portions scraped

page_text: off during such sharpening operation will be delivered at the outer edges of the wings
of the drill. In specifically describing the bits they may be said to have sharpening
portions at near their inner ends and recesses or pocket portions ¹ adjacent to
and on the outer side of said sharpening portions, as shewn in the drawings.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
(1) In a drill sharpener the combination of holding devices the bits and means
by which to force such bits in a direction from the centre outwards the bits
being adapted to sharpen the tool on their outward movement, substantially as
set forth.
(2) In a drill sharpener the combination with the holding devices of the bit support
the bits movable in said support toward and from a common centre and adapted to
sharpen the tool on their outward movement and means by which to actuate such bits
forcibly outward substantially as described.
(3) In an apparatus substantially as described the combination of the bit
support, the bits movable therein toward a common centre, and adapted to
sharpen the tool on their outward movement, spring devices for actuating such
bits inward and means by which to forciby move the bits outward substantially
as described.
(4) In an apparatus substantially as described the combination of the framing the
drill holder movable along the same the drill guide provided with an opening for the
passage of the drill and also with holding pieces movable toward and from said
opening and the sharpening hits substantially as set forth.
(5) In an apparatus substantially as described the combination of the framing the
drill holder movable along the same, a lever and detent by which said drill holder may
be set to and held in any suitable position the drill guide having an opening for the
passage of the drill and holding pieces movable toward and from such opening,
the sharpening bits movable toward and from a common centre and means by
which to forcibly move such bits outward substantially as and for the purposes
set forth.
(6) In an apparatus substantially as described a sharpener comprising a plurality
of bits meeting at a central point and movable outward therefrom and adapted
to sharpen the tool on their outward movement substantially as set forth.
(7) In an apparatus substantially as described the combination of the bits movable
outwards from an inner or central position, devices by which to press the drill
bit end wise against the bits and means whereby to move the bits forcibly outward
substantially as set forth.
(8) In an apparatus substantially as described the combination with the outwardly
movable bits and their support, of the armed wheel engaging such bits and the handle
lever connected with such armed wheel substantially as set forth.
(9) In an apparatus substantially as described the combination with the guide of
the face plate having an opening formed with cam walls and provided in its inner face
with cam grooves and the holding pieces arranged for engagement by the cam walls
of the face plate opening and having pins or projections entering the grooves thereof
substantially as and for the purposes set forth.
(10) In an apparatus substantially as described the combination with a suitable
support of the bits movable outward from an inner or central position, such bits
having sharpening portions near their inner ends and recesses or pockets adjacent
to and on the outer sides of said sharpening portions and means by which to move said
bits outward substantially as and for the purposes set forth.
Dated this 29th day of December 1896.
PERCY R. J. WILLIS,
Agent for Applicant.