Improvement on Apparatus for Holding Twist Drills and other Round Tools for use on a Sharpening Machine.
Year: 1893

page_text: Date of Application, 28th Mar., 1893
Complete Specification Left, 1st Sept., 1893-Accepted, 28th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvement on Apparatus for Holding Twist Drills and other
Round Tools for use on a Sharpening Machine.
ROBERT LANG of the Firm of John Lang & Sons Lathe Manufacturers
and Special Tool Makers Mary Street Johnstone near Glasgow do hereby declare
the nature of this invention to be as follows
The object of this invention is to hold twist drills or other round tools
sufficiently rigid so that they may be sharpened on the cutting lips, while they
can be conveniently changed from one cutting lip to another.
The following is a description of how this invention is used. The centre at
shank end of twist drill or other round cutting tool is placed in a corresponding
centre on the apparatus prepared to receive it, the other end of drill or other
round cutting tool is placed in a V slot cut out of a thin plate of steel and is
so arranged that it can be held by the hand sufficiently rigid while it is passed
accross an emery or other wheel to sharpen the cutting lips.
Dated this 27th day of March 1893.
ROBERT LANG.
COMPLETE SPECIFICATION.
Improvement on Apparatus for Holding Twist Drills and other
Round Tools for use on a Sharpening Machine.
I ROBERT LANG of the Firm of John Lang & Sons, Lathe Manufacturers
and Special Tool Makers, Mary Street, Johnstone, near Glasgow 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:-
The object of this invention is to hold twist drills or other round tools
sufficiently rigid so that they may be sharpened on the cutting lips, while they can
be conveniently changed from one cutting lip to another.
Fig. 1 is a view showing a twist drill A in position ready to be sharpened. B is
the emery or corundum wheel used for sharpening. C is the centre on which the
end of drill rests. D is the thin plate of steel having a V slot for holding the
drill.
Fig. 2 is a plan view of the thin plate of steel D with the drill A in position.
E and F are the two cutting lips that require to be sharpened.
Fig. 3 is a cross section on line H K showing the slide carrying the centre C.
The manner of operating this apparatus is as follows. The centre at shank end
of twist drill is placed in the centre C, which can be moved up or down on the
slide R shown at Fig. 3 and fixed in the correct position to suit length of drill, by
the binding handle N, so that lip E is parallel with line G on plate.
The other end of drill rests in the V slot which is cut out of the thin steel
plate D. This plate is fitted into slide as shown in Fig. 1, and after being adjusted
into correct position is fixed there by the thumb screw M.
The drill is now ready to be sharpened and this is a very simple process. The
drill is held by the right hand close up to the V slot and then the slide O carrying
the drill is moved on the slide P. both hands being used to give the required
movement forwards and backwards under the sharpening wheel B, and after one lip
is done the drill is turned round to bring the other lip into position, and this
process is repeated alternately until the drill is properly sharpened.

page_text: 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
An improved apparatus that can be applied to a sharpening machine consisting
of a thin steel plate in which is cut a V slot suitable for holding one end of a twist
drill while it is being sharpened, the other end being supported by a centre.
Dated this Thirty-first day of August, Eighteen hundred and ninety-three.
ROBERT LANG.