Improvements in Means for Cutting the Flutes or Grooves in Twist Drills, Twist Rhymers, and other Spiral or Diagonal Flutes or Grooves.
Year: 1889

page_text: Date of Application, 6th Mar., 1889
Complete Specification Left, 6th Dec., 1889-Accepted, 25th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in Means for Cutting the Flutes or Grooves in Twist
Drills, Twist Rhymers, and other Spiral or Diagonal Flutes or
Grooves.
We JOSEPH PRESTON of 19 Alma Street and ARTHUR FOWLER of 80 Craven Street
both of the City of Coventry and County of Warwick Mechanicians do hereby declare
the nature of this invention to be as follows:―
Our invention for its object improvements in means for cutting the flutes or grooves
in twist drills, twist rhymers, or such like things as require spiral or diagonal flutes or
grooves, and the same is applicable to either lathe or milling machine.
To put our invention in operation. We make two plates of suitable width, length,
and thickness, and place one over the other, at a suitable distance apart, and the said
plates are held apart by pillars, or other suitable means, so that the distance between
said plates may be varied as desired. And on the top or upper plate, at the back end,
we place a carriage, or bearing, which has an internal screw thread and answers as a
fixed nut, and in front of said carriage, or bearing, is another carriage, or bearing, or
angle plate, or other suitable means of support at a suitable distance to allow of a
toothed wheel or pinnion being inserted between said back or other bearing. And
in a line with said two bearings, at or near the middle of the plates length, is two
other bearings, and these also are placed at a distance apart, to allow of a toothed
wheel or pinnion being inserted between. And at the front end of said top plate, is
placed a suitable socket, capable of being moved a short distance in slides, or by other
suitable means, in a longitudional direction of said top plate, and said socket being
vertical, and in which is fitted a plunger, which passes through said socket and
projects below the underside of said top plate, and said plunger carries a rest, or steady,
at its top or upper end. We then make a coarse threaded screw of suitable length,
and diameter, on which at one end we fix an hand wheel, and the other end is reduced to
We now make a
fit in a socket, and said screw is key slotted along said screw threads.
spindle of suitable length, and diameter, at one_end_of which is connected by
a universal joint, a carrier, or chuck, or other suitable means, and at the other end is-a-
socket, and this also is key slotted externally, the greater part of its length. We now
pass the said screw through the said bearings at back end, between which is placed
the said toothed wheel or pinnion. And said toothed wheel or pinnion having been
bored to fit said screw on top of threads and having a key fitted therein to fit in said
key slot in said screw so that said screw may move freely through said wheel or
pinnion. And said spindle is passed through said bearings in middle of said plate
between which is inserted another toothed wheel or pinnion, with key fitted same as
one above. And between the two inner of said bearings, the two ends of said screw
and said spindle meet and the reduced end of said screw passes into the socket in end
of said spindle and makes a free revolving joint, to which suitable means are applied to
secure said reduced end in said socket so that the said screw may force the said
spindle forward or backward without causing same to revolve. And said carrier, or
chuck, at front end of said spindlo, is to receive and hold the shank of the drill or
other article to be cut. And said rest or steady at top or upper end of said plunger,
is to form a bed, or rest, to support that part of said drill, or other article, which is
in contact with the cutter, and said universal joint at front end of said spindle is to
allow of said plunger being raised or lowered give the required taper to the centre
of said drill, without causeing spring to said drill or friction at front bearing of said
spindle. And on the bottom or lower plate, or on the underside of top plate,
we place two or more bearings, of suitable constructions, and at suitable distances,
to carry an axle, or shaft, on which is fixed by suitable means, to allow of them being

page_text: changed readily, two or more toothed wheels or pinnions, which are placed at a
suitable distance from each other, and in such a position that they will (through
apertures in said top plate) gear with said toothed wheels or pinnions on said screw
and spindle on said top or upper plate, and form the means for varying the pitch of
. the article to be cut. And said axle, or shaft, extends forward and communicates with
a cam, or taper slide, or other suitable motion for raising or lowering said plunger.
We may consider it advisable not to place said axle, or shaft, on said lower or bottom
plate, as the distance taken up by a set of large toothed wheels and pinnions might be
to great to allow of said machine being applied to a lathe of low centre, so we place
the said axle, or shaft, on the top or upper plate in any convenient position on either
side, or above, said screw and spindle, and by so doing may dispense with a part, or
the whole, of said bottom or lower plate. And applying our invention to a lathe, we
apply means, by which the article to be cut, may be made to aproach, the cutter, as
desired, so that a light or heavy cut may be obtained. And to effect this, we place
on a lathe bed, a suitable plate to form a base, and above said base plate, and beneath
said plate of said machine at the front, we place vertical slides, or a vertical screw,
or both, or a cam, or cams, or eccentrics, or other suitable means, for raising and
lowering of said machine, to or from the cutter.
Dated this 5th day of March 1889.
JOHN BEESLEY,
Agent to the Applicants.
COME LIM DIEUIFICATION.
Improvements in Means for Cutting the Flutes or Grooves in Twist
Drills, Twist Rhymers, and other Spiral or Diagonal Flutes or
Grooves.
We JOSEPH PRESTON of 19 Alma Street and ARTHUR FOWLER of 80 Craven Street
both of the City of Coventry and County of Warwick, Mechanicians, do hereby declare
the nature of our invention for IMPROVEMENTS IN MEANS FOR CUTTING THE FLUTES OR
GROOVES IN TWIST DRILLS, TWIST RHYMERS, AND OTHER SPIRAL OR DIAGONAL
FLUTES OR GROOVES, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
To put cur invention in operation which will be better understood by reference to the
accompanying drawing. Figure 1. a side elevation. Figure 2. a plan. Figure 3. a front
end elevation. Figure 4. a plan. Figure 5. a side elevation in section. In which similar
letters refer to same parts in different views, A is a plate carrying the working parts of the
apparatus on which we fix the bearings B, the bearing nut C, the plunger socket D
the bearings E the bearings F and lugs G and G 1: H is a spindle passing through
the bearings B and B 1. and toothed wheel M, and at the front end of H is the
universal joint I. to which is attached the plate or chuck J. which carries the two lugs
forming the fork J 1. And at the back end of H is the socket or chamber K for
receiving the reduced end of the screw L, and N is a key slot in which works a
feather key which is fitted and fixed in the toothed wheel M, and L is a square
threaded screw on which at its outer end is the hand wheel O, and which screws into
the screwed bearing nut C and passes through the toothed pinion M 2. and the
bearing B 2. and into the socket or chamber K and is held in position by the pins K 1,
leaving it free to revolve. And the key slot N 1. fitting a feather key which is fitted
and fixed in the toothed pinion M 2.
And P is an axle which rotates in the bearings F and F 1. and carries the toothed
wheel M 1. and pinion M 3. and passes through and extends forward, beyond the
bearing F, and its extended end is screw threaded and screws into the screwed socket Q
which extends beyond the end of the shaft P and unites with the lever R and forming
a knuckle joint, and the lever R is fixed upon the rocking shaft S. and said rocking
shaft S which works in the bearings E and E 1. and passes through the bearing E 1.
and carries the eccentric U, which works in a slot in the plunger T, and said rocking

page_text: shaft S. is carried backwards (but not shown in the accompanying drawing in that
position) and in place of the eccentric U we also use (for the same purpose) the lever
and inclined bar U 1. and U 2. as shown in plan 4 and sectional elevation 5. of the
accompanying drawing, and at the front end and underneath plate A we place another
plate A 1. which at its front end carries the lug V, and at its back end carries the
sockets W, and underneath the said plate A 1. we form a lug or strip X and in the
sockets W we fit the scrowed rods Y on which we place the two nuts Y 1 and Y 2.
and at the top or upper end of said screwed rods Y we form an eye through which
passes the screwed bolts Y 3. and screws into the lugs G 1. And between the lugs G
and we place the swivel nut and bearing Z and Z4. on which we form trunnions or
bearings which we screw thread, to receive the nuts or collars Z 1 and Z 2, and said
trunnions or bearings pass through and work freely in said holes in said lugs G and V
and through said swivel nut we pass the screw rod Z3 and into the said swivel
bearing 4, and is prevented from leaving same by the nut or collar Z 5.
In order that our invention and the means by which the same may be carried into
practical effect may be thoroughly understood, we will proceed to describe the same
in detail, referring in so doing to the accompanying drawing, which is to be taken as
part of the specification, and read therewith.
Having placed our invention on the bed of a lathe, the lug or strip X is for the
purpose of positioning and on which the apparatus may be swiveled to any desired
angle. We now give rotary motion to the wheel O, which communicates motion
longitudinally to the spindle H, and rotary motion to the toothed pinion M 2, and
wheel M I, through axle P through the toothed pinion M3, and wheel M giving
rotary motion to the spindle H. And the source from which various pitches are
obtained, are by means of toothed change wheels as illustrated by M. M 1. M 2. and M 3,
of the accompanying drawing, and the bearings F. and F 1. of axle P are fitted in
transverse slots (not shown in accompanying drawing) in web of plate A to allow of
gearing change wheels of varied diameters and the said bearings F. and F 1. are held
in position by the bolts F 2. F 3. F4 and F5. And said rotary motion being given
to axle P causes it to unscrew and force screwed socket Q forward, communicating
motion through the lever R to the rocking shaft S and the eccentric U, causing the
plunger T to descend, which is for the purpose of varying the thickness of centre and
width of groove in the article or articles. to be fluted or grooved, which has to pass
through or across the said plunger T. And the said universal joint is for the purpose
of allowing freedom to the article or articles being fluted or grooved and preventing
spring thereof due to raising and lowering of plunger T during the process of cutting,
being at the same time held firmly by the plate or chuck J, from which we obtain the
various divisions (required to be cut) by any of the well known Mechanical means.
And plate A 1 is for the purpose of supporting and adjusting said apparatus to the
various heights of the lathe centres, by means of the screwed rods Y the nuts Y 1. and Y 2.
and screwed rods Z3. and said screwed rod Z 3. is also for the purpose of regulating
the depths of flutes or grooves.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In an improved apparatus for cutting the flutes or grooves in twist drills, twist
rhymers, and other spiral, or diagonal flutes or grooves the combination of the
screw L the spindle H and the universal joint I substantially as illustrated and set
forth, and for the purpose herein described.
2. In an improved apparatus the combination of the axle P the screwed socket Q
the lever R the shaft S the eccentric U and the plunger T substantially as illustrated
and set forth, and for the purpose herein described.
3. In an improved apparatus the combination with the shaft S the lever U 1. and
inclined bar U2, and the plunger T substantially as illustrated and set forth, and for
the purpose herein described.

page_text: 4. In combination with an improved apparatus the plate A 1, the screwed rods Y
the screwed rod Z 3. the swivel nut Z, the lugs G and V and the swivel bearing Z4
and the lug or strip X substantially as illustrated and set forth, and for the purpose
herein described. We do not bind ourselves to the exact position of the axle P as
shown in accompanying drawing, but claim to place it in any convenient position to 5
gear with toothed pinion M 1 and toothed wheel M.
Dated this 5th day of December 1889.
JOSEPH PRESTON.
ARTHUR FOWLER.