Improvements in or connected with the Cutters of Drilling Machines.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in or connected with the Cutters of Drilling Machines.
I, HENRY BLASIIILL, of 7, Percy Villas, St. Georges Road, Hull, in the County
of Yorkshire, Engineer, do hereby declare the nature of this invention to be as
follows:-
:-
The object of my invention is to provide certain improvements in or connected
with the cutters of drilling machines whereby they can be so regulated that they
will cut various sized holes without the necessity of employing different sized
cutters, also to reduce the bearing or cutting part, so reducing the power_required
for cutting or drilling such holes. For the purpose of my invention, I employ
preferably two discs for placing on the spindle of the drilling machine; recesses
or the like may be provided in one or both of such discs for taking the cutter
holders; the drill spindle may have a hole through it as heretofore to take the
said cutter holders which may consist of bars provided with holes to receive
the cutters, the holders and cutters being preferably separate, but if desired the
holders and cutters may be in one piece, the cutter in each case being a piece
which projects below the holder, one or more cutter may be employed, and in
either case; such cutter is held firmly in position, as when set the discs are
nipped up tight by means of screw bolts or other suitable means.
In place of the spindle having a hole through it, it may have flats on it, the
cutter holders bearing against these flats instead of passing through the spindle.
The holders may each have a ledge or slot, and may each be provided with an
enlarged end into which the cutters are fitted, the enlarged end of one holder
works under the ledge or within the slot of the other holder, by this means they
can be drawn out or pushed in to increase or decrease the distance apart of the
cutters, thus allowing of various sized holes being cut or bored.
The cutters when loose ones may be held in the cutter holders by means of
set screws or the like, and such set screws may slide in slots in the cutter holders
so as not to interfere with the adjustment of such cutter holders and cutters.
If desired the tops of the cutters may project above their holders, and a bar
or the like may engage with the two of them to give further rigidity to such
cutters.

page_text: Improvements in or connected with the Cutters of Drilling Machines,
I, HENRY BLASHILL, of 24, Clarendon Street, late of 7, Percy Villas, St.
George's Road, both in Hull, in the County of Yorkshire, Engineer, 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 my invention is to provide certain improvements in or connected
with the cutters of drilling machines whereby they can be so regulated that they
will cut various sized holes without the necessity of employing different sized
cutters.
DESCRIPTION OF DRAWINGS.
Fig. 1 represents a side view of my improved method of mounting cutters
on the spindle of drilling machines.
Fig. 2 is a sectional plan view of same on the line A B.
Fig. 3 is a side view shewing a modification in which the cutter holders work
on either side of the drill spindle and have enlarged heads each working in a
slot on the body of the opposite holder.
Fig. 4 represents a sectional plan view on the line A B of Fig. 3.
Fig. 5 represents a perspective view of Fig. 3.
Fig. 6 is a vertical sectional view showing the method of mounting the
cutters when worked by a ratchet brace, and shewing threaded sleeve for giving
motion to the cutters, the cutter holders being shown in cross section.
Fig. 7 is a vertical sectional view of my invention when the drill spindle is
provided with a fixed plate in place of one of the discs, and the cutters being
provided with a connecting plate for the purpose of giving them greater rigidity.
Fig. 8 is a sectional view of Fig. 7 on the line A B.
Fig. 9 shows a plan view of templet employed for guiding cutters to cut oval
or elliptical holes and,
Fig. 10 is a sectional vertical view of templet, discs and cutter holders with
their cutters, mounted on cutter spindle.
Figs. 5 9 and 10 are drawn to a smaller scale than the other figures.
For the purpose of my invention I employ preferably two or more discs or
plates A for placing on the spindle B of the drilling machine recesses or the
like C may be provided in one or both of such discs for taking the cutter
holders the drill spindle B may have a hole ¹ through it as heretofore to
take the said cutter holders D D which may consist of bars provided with holes D'
to receive the cutters E E the holders and cutters being preferably separate but
if desired the holders and cutters may be in one piece as shown at Fig. 1 the
cutter in each case being a piece which projects below the holder one or more
cutters may be employed and in either case each cutter is held firmly in position
as when set the discs are nipped up tight by means of screw bolts F or other
suitable means. If desired an ordinary cutter may be used with the discs and
passed through the hole in the drill spindle the discs nipping it up tight with-
out it having to be tightly keyed as at present by this means allowing of it being
more easily removed.
When the cutter holders D pass through the drill spindle B they may have
their ends reduced to allow of them being drawn out or pushed in and fit one
into the other as shown at Fig. 2 so that they do not require such a big hole in
the drill spindle to take them a hole of about the thickness of one of the holders
only being quite sufficient.

page_text: If desired one disc or plate only may be employed in such a case no screw
bolts or the like would be necessary.
In place of the spindle having a hole through it it may have flats G on it the
cutter holders bearing against these flats and resting on their projecting bottoms
instead of passing through the spindle such flats act as guides for the cutter
holders and support them thus keeping them as well as the discs at a fixed
height and preventing them from working down.
The holders may each have a ledge or slot H see Fig. 5 and may be provided
with an enlarged end D into which the cutters E are fitted the enlarged end
of one holder works under the ledge or within the slot of the other holder by
this means they can be drawn out or pushed in to increase or decrease the dis-
tance apart of the cutters thus allowing of various sized holes being cut or bored,
this dispenses with the employment of a hole through the drill spindle. The
cutters when loose ones may be held in the cutter holders by means of set screws
keys or the like J.
If desired the tops of the cutters may project above their holders and a bar
or the like K as shown at Fig. 7 may engage with the two of them to give further
rigidity to such cutters.
When my invention is to be applied to a spindle to be used with a ratchet
brace I employ an internally threaded sleeve L which is mounted on the spindle B
which fits the brace, such spindle being externally threaded for a suitable distance
to engage with the threaded sleeve, the sleeve has a recess in it within which
fits a disc M which screws down to the ordinary discs A A which take the
cutters.
The flats on the drill spindle are deepened to allow of the cutters moving up
and down on the said drill spindle.
When the ratchet brace is in operation the threaded sleeve L revolves or turns
on the drill spindle and works in a downward direction by means of the thread
in such spindle thus bringing the cutters into contact with the metal or the like
in which they have to cut the hole, the sleeve being prevented from slipping by
the disc M.
For cutting tube holes the drill spindle is preferably provided with a fixed
plate which may be in one piece with it this plate is preferably square or oblong
instead of round like the discs, a loose plate of a similar shape is employed which
is nipped up to the fixed plate by screw bolts or the like the plates have slots in
them to take the cutter holders in a similar manner to the discs: by this means
the cutters can be brought nearer together for small work than is possible with
the discs as the screw bolts can be placed further away from the cutter holders
and so do not interfere with them see Figs. 7 and 8.
For cutting oval holes or holes of an elliptical shape I employ a templet con-
sisting of two plates N N one less than the other the smaller one fitting within
the larger one and being connected together by means of bridges O leaving a
race or space P between them of a similar shape and size as the holes required
to be cut, one or other of the discs which take the cutter holders but preferably
the top one is provided with a flange or a loose disc or plate R may be used
instead.
The templet may have a recess N¹ at either end so that in case of accident to
one or both of the cutters a stop could be put in one or both of the recesses to
keep it in position until new cutters were mounted.
The discs A A are placed on the drill spindle and made fast to it by keys or
the like the templet fitting preferably between the flange on the disc A or the
loose dise R if one is employed and the cutter holders D the tops of the cutters E
being within the space between the two templet plates. The templet is fastened
to the metal or the like in which the holes are to be cut and as the spindle
revolves and turns the cutters with it such cutters work within the space between
the two plates forming the templet and being movable are led around the oval
or other shaped race or space and are so made to cut a hole of the same size and

page_text: shape as the space between the two plates the bridges allowing the cutters to
pass the parts where the plates are connected without them catching...
The templet may consist of several plates of different sizes if desired having
spaces of different shapes and sizes between them so that one set of guide plates
can be used for holes of various sizes and shapes.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. In connection with drilling machines, the employment of a disc or plate,
or of discs or plates such as A A, mounted on the drill spindle, for the purpose
of taking the cutter or cutters, in the manner and for the purposes, substantially
as shown and described.
2. In connection with drilling machines, the employment of two or more in-
dependent cutters EE, fitted in sliding holders D D, mounted in discs A A,
mounted upon the drill spindle and secured by screw bolts or the like F F, the
drill spindle having a hole. B' through it, or flats G formed on it, for supporting
the cutter holders, in the manner and for the purposes, substantially as shown
and described.
3. In connection with drills worked by a ratchet brace or similar contrivance,
the employment of a threaded sleeve L, working in a threaded drill spindle B,
disc M, fitting in a recess in the sleeve, discs A A, sliding cutter holders D D,
cutters E E, and screw bolts or the like F, in the manner and for the purposes,
substantially as shown and described.
Dated this Eighteenth day of Tunuam 1900
JOHN E. WALSH,
Savile Street, Hull, and Crossley Street, Halifax,
Patent Agent for the Applicant.