Improvements in Driving Gear for Drilling, Boring, Milling, Gear- cutting, Shaping, Slotting, and Planing Machines.
Year: 1899

page_text: Date of Application, 9th June, 1899--Accepted, 15th July, 1899
DE MULTIVALION.
Improvements in Driving Gear for Drilling, Boring, Milling, Gear-
cutting, Shaping, Slotting, and Planing Machines.
I, WILLIAM BUCKLEY, of Patent Piston Works, Millsands, Sheffield, 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:-
--
This invention relates to the driving gear of drilling, boring, milling, gear-
cutting, shaping, slotting and planing machines, and is applicable both to such
of such machines in which the cutting is done rotationally, as in drilling, boring,
milling and gear-cutting machines, and to such of such machines in which the
cutting is done rectilineally, whether the rectilineal motion be produced by disc
and variable throw cranks, as in shaping and slotting machines, or by rack and
pinion or by screw and nut, as in planing machines.
It being still a desideratum in such machines to provide means for obtaining a
cutting speed correctly adjusted and suitable to the diameter of the drill or cutter,
or to the throw of the crank or disc, or to the relative hardness of the material
operated upon, or to the requirements of the work to be performed, without loss
or variation of initial purchase of or variation of speed of the driving pulley or
first driven wheel or shaft in effecting any required change of cutting speed;
the present invention has for its object the provision of means adapted to fulfil
such requirements, and, at the same time, to provide sufficient power to perform
the work in hand, and to avoid the disadvantages incidental to the use of stepped
cone driving pulleys in those machines usually driven by means thereof, and also
the provision of means for enabling the cutting speed to be varied to suit the
varying hardnesses of the materials operated upon in those machines where
hitherto the cutting speed has been constant and incapable of being changed.
To this end, the invention consists in the combination, with the operative parts
of such of such machines wherein the cutting is done rotationally or wherein it
is done rectilineally and the rectilineal motion is produced by disc and variable
cranks, of: a main spindle or shaft and a counterspindle or counterspindles, in
number varying according as the machine is single, double, treble, quadruple,
quintuple, or other multiple geared, so adapted that the ends of the main spindle
and of the counterspindle or counterspindles, or of the counterspindles only, are
prolonged so as to project beyond their bearings and are adapted to receive inter-
changeable change wheels: a reversible series of change wheels applicable or
interchangeably applicable to such extending spindle ends and serving to con-
nect the same with each other or one with another, as required according to the
speed and purchase required for the work to be performed; a broad plain
cylindrical driving pulley of one diameter adapted to be driven at a given or
uniform speed irrespective of any required variations of speed of the main spindle
or shaft of the drilling, boring; milling or gear-cutting machine, or of the stroke
of the ram of the shaping or slotting machine to which the gear is applied;-and

page_text: gearing arranged between the bearings of such spindles and making
with the change wheels applied to the spindle ends either double, treble,
quadruple, quintuple, sextuple or other multiple gear, according to the require-
ments and dimensions of the respective machines; or without gearing between the
spindle bearings, the reversible series of change wheels then forming a single
gear the whole being adapted to co-operate in such manner that the main
spindle, when prolonged, will be driven at its back end directly from a counter-
spindle when such two spindles are connected by the change wheels, and, when not
prolonged, will be driven by the gearing between the bearings, when the lesser
purchases and quicker speeds are required for drilling or boring small holes or
using small milling or gear cutters in drilling, boring, milling or gear-cutting
machines, or for taking short strokes in shaping or slotting machines, and will
be driven from its front end by the gearing between the spindle bearings when
two counter-spindles are connected by the change wheels, when the higher pur-
chases and slower speeds are required for drilling or boring large holes or using
large milling or gear cutters in drilling, boring, milling or gear-cutting machines,
or for taking long strokes in shaping or slotting machines, and that, between
the extremes of such higher and lower ranges of purchase and speed so obtainable;
the gradations of change will be regular and of small difference and in number
determined by that of the reversible series of change wheels employed and the
times they are interchangeably applicable as aforesaid; whereby a much greater
number of different speeds and speeds of much less difference can be obtained than
can be obtained in such machines having, as ordinarily, a stepped cone speed chang-
ing pulley, so that such machines fitted with the improved driving gear will be ren-
dered much more generally applicable and can be worked in a much more efficient
manner than can like machines having a stepped cone speed changing pulley, and can
turn out a greatly increased quantity of work, not being subject (whatever be the
required change-of-speed-of the main spindle or shaft in drilling, boring, milling
or gear-cutting machines or the required differences of speed and stroke in shaping-
and slotting machines,) to the loss of initial purchase of the belt pulley inherent
to the use of stepped cone speed changing pulleys. -
The invention also consists in the combination with the operative parts of such
of such firstly mentioned machines wherein the cutting is done rectilineally and
the rectilineal motion is produced by rack and pinion or by screw and nut, of: -a
main spindle and preferably two counterspindles prolonged and adapted as afore-
said a reversible series of change wheels interchangeably applicable to the
projecting ends of such spindles as aforesaid;-three plain cylindrical pulleys of
one diameter and adapted to be driven at a uniform speed, one being used for
driving the machine table while cutting, another for returning the table at a
quicker speed, and the other being an idle pulley intermediate of such two;-
and gearing arranged between the spindle bearings; the whole being adapted
to co-operate in such manner that the table can be driven at the higher or lower
ranges of speed according to the hardness of the material operated upon, that the
gradations of change of speed will be regular and of small difference and in
number determined as aforesaid, and that, whatever change in the cutting speed
of the table is obtained, the return speed of the table will be in the same ratio
throughout the whole range of such cutting speeds.
The improved driving gear carried in suitable bearings may be located either
at the base or in the body of the machine, or in a suitable arm or bracket casi
on or otherwise secured thereto, or upon a movable carriage or saddle, accordingly
as may be best appropriate to the particular machine to which it is applied, as
hereinafter more particularly described with reference to the accompanying draw-
ings, which represent an example of each of the different machines above
mentioned, showing the same adapted with the improved driving gear. As regards
the gearing between the spindle bearings, this need not necessarily be of the
exact arrangement represented, as other equivalent arrangements of such gearing,
adapted to serve the like functions, may be used in lieu thereof, and any of the

page_text: machines may be single, double, treble, quadruple, quintuple, or other multiple
geared according to the requirements and dimensions of the machine.
On the drawings;
-
Figures,, 1, and 2, respectively represent side and end part elevations of a double
geared vertical drilling machine adapted with a suitable arrangement of the
improved driving gear;
Figs. 3, and 4, respectively represent side and end elevations of a quadruple
geared movable carriage or saddle of a radial drilling machine, similarly adapted;
Figs. 5, and 6, respectively represent side and end part elevations of a horizontal
boring machine with a quintuple geared movable carriage, similarly adapted;
Figs. 7, and 8, respectively represent side and end elevations of a quadruple
geared horizontal milling machine, similarly adapted;
Figs. 9, and 10, respectively represent a side elevation and a plan of a double
geared gear-cutting machine, similarly adapted, the driving gear being carried on a
movable carriage;
Figs., 11, and 12, respectively represent part side elevation and end elevation
of a treble geared shaping machine, similarly, adapted;
Figs. 13, and 14, respectively represent part side elevation and part end elevation
of a single geared slotting machine, similarly adapted; and
Figs. 15, and 16, respectively represent. part. side elevation and part plan of a
quadruple geared planing machine, similarly adapted...
--
Like reference letters indicate like parts wherever repeated on the drawings.
a, represents the main spindle or the main shaft for communicating motion
to the machine;-b, represents a counterspindle (Figs. 1, 2; and 9, to 14;); or a
first counterspindle where more than one counterspindle is used (Figs. 3, to 8;
15, and 16)-c, represents a second counterspindle (Figs. 3, to 8; 15,
and. 16), represents a third counterspindle (Figs. 5. and 6,);-e, represents
the back bearing, and e', the front bearing in which the spindles are mounted; -
al, represents the prolonged and. key-fitted end of the main spindle projecting
beyond its back bearing, e, (Figs. 1, to 4; and 9, to 16;); b, represents the pro-
longed and key-fitted end of the first counterspindle projecting beyond its back
bearing, e, and 2, (Figs. 5, and 6,) the prolonged and key-fitted end of the same
spindle projecting beyond its front bearing, e¹-c', represents the pro-
longed and key-fitted end of the second counter-spindle projecting
beyond its back bearing, e, (Figs. 3, to 8; 15, and 16;), and c²,
the prolonged and key-fitted end of the same spindle projecting beyond
its front bearing, el, (Figs. 5, and (,);, represents the prolonged and -key-
fitted end of the third counterspindle projecting beyond its back bearing, c,
and 2, the prolonged and key-fitted end of the same spindle projecting beyond its
front bearing, e, (Figs. 5, and 6,);-f, represents the change wheels.
Of the gearing arranged between the spindle bearings, e, e-represents the
driving pulley of one diameter, which is located on the main spindle or main
driving shaft. in Figs. 1, 2; 9, 10; 15, and 16; and on the first counterspindle
in Figs. 7, 8 and 11, to 14;- 1, (Figs. 3, to 6.) represents a wheel driven from
a driving pulley, g, located in the base of the machine, not shown in Figs. 3, and 4,
but shown by dotted. lines in Fig. 5; i, represents the first motion pinion, which
is fast to the driving pulley, g. (Figs. 1, 2 and 7, to 12), and to one of the
outer pulleys, g, (Figs. 15, and 16,), and to the wheel, h, (Figs. 3, to 6,); and ',
represents the first motion wheel in Figs. 13, and 14, the driving pulley is
keyed to the counterspindle which thus becomes the first motion spindle, repre-
sents the second motion pinion, which is fast to the first motion wheel, , (Figs. 3,
to S; 11, 12; 15, and 16;) being connected by a barrel, o, in Figs. 7, 8; 11,
and 12 and, represents the second motion wheel, (Figs. 3, to 8; 11, 12; 15,
and 16), represents the fourth motion pinion, and A, the fourth motion
wheel,' (Figs. 3, to 8:15, and 16;);-, represents the fifth motion pinion, and,
the fifth motion wheel, (Figs. 5, and 6,);m, represents a clutch plate which is
fast to its spindle, and to which the driving pulley, g, can be connected when

page_text: required (Figs. 1, and 2,);-n, represents a clutch plate which is fast to its
spindle, and to which the first motion wheel, i, can be connected when required
(Figs. 3, to 6,).
In the arrangement represented in Figs. 1, and 2, a main shaft, a, (which com-
municates its motion through bevel wheels to the vertical drill spindle as repre-
sented,) and one counterspindle, b, are carried in bearings, e, e, in the body of
the machine, and the prolonged key-fitted ends, a', b', of both such spindles are
connected by the change wheels, f, by which the main spindle is driven from
its back end, the smallest change pinion being shown on the projecting end of the
counterspindle as driving the largest change wheel on the projecting end of the
main shaft, as arranged for drilling the largest holes at the slowest speed; to
counteract the purchase of the first motion pinion, i, and wheel, , the change
wheels are successively reversed until the largest change wheel is on the projecting
end of the counterspindle and the smallest change pinion is on the projecting end
of the main spindle, for drilling the smallest holes at the quickest speed. The
keyed wheel,, can be slid out of gear with the pinion, i, and the driving pulley, g,
be made fast to the clutch plate, m, when it is required to drive the main shaft
direct by the belt.
In the arrangement represented in Figs. 3, and 4, a main shaft, a, and first
and second counterspindles, b, c, are carried in bearings, e, e¹, and the ends of all
such spindles are prolonged and project beyond the bearing, e, the first counter-
-spindle-being-arranged equidistant from the main shaft and from the second
counterspindle, and the same series of change wheels, f; are-usable, either-to..
drive the main shaft from the first counterspindle, or to connect the counter-
spindles so as to drive the first from the second. The plain driving pulley, not
shown in the drawing, is placed at the base of the machine, its motion being
communicated, by means-of-bevel,-mitre_or_spur_wheels_ and suitable shafts as
usually employed in this class of machine, to a shaft, ?, fitted with a keyed-
pinion, q, free to slide on the shaft, and gearing with a wheel, h, fast to the first
motion pinion, i, and running freely on the main shaft, a. When the prolonged
key-fitted ends of the counterspindles are connected by the change wheels, as shown,
the machine is driven quadruple geared, motion being transmitted from the first
motion pinion, i, to the second counterspindle, through the first motion wheel, i¹,
and the second motion pinion, j, which are fast together and run freely on the
first counterspindle, and the second motion wheel, j', which is keyed to the second
counterspindle (but can be slid into or out of gear with the second motion pinion),
and from the second counterspindle to the main shaft by the change wheels and
the fourth motion pinion, k, and wheel, k', as arranged for drilling the largest
holes at the slowest speed. When the prolonged key-fitted ends of the main shaft
and the first counterspindle are connected by the change wheels the machine is
driven double geared, motion then being transmitted to the first counterspindle
through the pinion, i, wheel, i, clutch plate, n, and from the first counterspindle
to the main shaft by the change wheels; the wheel, ¹, and pinion, k, being
slid out of gear, as arranged for drilling the smallest holes at the quickest speed.
In the arrangement represented in Figs. 5, and 6, a main spindle socket, a,
and first, second and third counterspindles, b, c, and d, are used, the ends of all
which counterspindles are prolonged and project beyond both their bearings, e,
and e', the first counterspindle, b, and third counterspindle, d, being arranged
equidistant from and between the main spindle and the second counter-spindle, c.
The series of change wheels are usable to connect the third counterspindle either
with the second or with the first counterspindle at either end, or to connect the
second with the first counterspindle at either end, and to connect the third counter-
spindle with the second counterspindle at one end when the latter is connected
to the first counterspindle by change wheels at its other end. The plain driving
pulley, g, shown by dotted lines in Fig. 5, is placed at the base of the machine, its
motion is communicated by means of bevel wheels, r, and a vertical shaft, s, to a
skew wheel, h, fast to the first motion pinion, i, and runs freely on the first counter-

page_text: spindle, b. When the prolonged key-fitted ends of the third and second counter-
spindles are connected by the change wheels so that the latter is driven from the
former, as shown, the machine is driven quintuple geared, motion being trans-
mitted from the first motion pinion, i, to the third counterspindle through the
first motion wheel, ', and second motion pinion, j, which are fast together and
run freely on the second counterspindle, and the second motion wheel, j', which
is keyed to the third counterspindle but can be slid into or out of gear with the
pinion, On the second counterspindle driven by the change wheel the fourth
motion pinion, k, is keyed so as to be rotated thereby (but is free to be slid along
out of gear with wheel, k,) and rotates the fourth motion wheel, ¹, fifth motion
pinion, with first counter-spindle to which they are both keyed, so that the
main spindle socket with its keyed wheel, l, is driven between the bearings by the
fifth motion pinion, 1, as arranged for boring the largest holes at the slowest speed.
When the prolonged key-fitted ends of the third and first counterspindles are con-
nected by the change wheels, so that the first is driven by the third, the machine
is driven quadruple geared and the gearing between the bearings is as arranged
for quintuple gear, excepting that the pinion, k, is slid out of gear with the
wheel, the machine is also driven quadruple purchase through five pairs of
wheels, and the direction of rotation of the boring bar reversed by connecting the
third and the second counterspindles at one end with change wheels, and con-
necting the second counterspindle at its opposite end with a pair of equal change
wheels to the first counterspindle, the pinion, k, remaining out of gear. When
the second counterspindle is connected with the first counterspindle by change
wheels, the machine is driven treble geared, with wheel, j¹, and pinion, k, slid out
of gear and wheel, a, locked to the clutch plate, n, and by using equal change
wheels when so geared the machine is driven by double purchase through the
three pairs of wheels. When the second counterspindle is connected to the third
counterspindle by change wheels at one end and the opposite end of the third
counterspindle is connected by change wheels to the first counterspindle, with
pinion, k, and wheel, j', slid out of gear, and wheel, ¹, locked to the clutch plate, n,
by reversing the change wheels until the smallest change pinions are driven by
the largest change wheels, the purchase of the wheels remaining in gear between
the bearings is counteracted, for boring small holes at the quickest speed.
In the arrangement represented in Figs. 7, and 8, a main spindle and first and
second counterspindles are carried in bearings, e, el, arranged in the manner
characteristic to this class of machine, with the ends of the counterspindles only
projecting beyond their back bearings, e, and adapted to receive change wheels;
the plain driving pulley, g, has fast to it the first motion pinion, i, and runs
freely on the first counterspindle, the first motion wheel, i¹, and second motion
pinica, j, are united by a barrel, o, and run freely on the main spindle. By this
arrangement, the prolonged key-fitted ends of the counterspindles are connected
by the change wheels and the main spindle with its keyed wheel, k', can only be
driven from between the bearings by the fourth motion pinion, k, which remains
in gear, and is rotated by the second counterspindle whether the machine is driven
double or quadruple geared. When driven quadruple geared, as shown, motion
is communicated from the driving pulley and first motion pinion to the first
counterspindle and its keyed second motion wheel, j, by the barrel wheel and
pinion, as arranged for driving the largest cutter at the slowest speed. When
driven double geared, the barrel wheel and pinion are slid along the main spindle
out of gear with pinion, i, and wheel, j', and the driving pulley is locked to the
wheel, j, as arranged for driving the smallest cutter at the quickest speed.
In the arrangement represented in Figs. 9, and 10, a main spindle, a, and a
counterspindle, b, are mounted in bearings, e, e¹, supported by a bracket or arm
with their prolonged key-fitted ends connected by the change wheels, and con-
necting gearing between the bearings, the same being shown with the smallest
change pinion on the projecting end of the counterspindle, as arranged for driving
the largest gear cutter at the slowest speed.

page_text: In the arrangement represented in Figs. 11, and 12, the main shaft is continued
the full length of the machine bed, and upon this portion of the shaft is keyed,
yet free to slide, a pinion (not shown) gearing with the disc wheel and com-
municating the motion to the rani or slide in the usual manner. The main shaft
is continued over the end of the bed, and, together with a counterspindle, b, is
carried in bearings, e¹, and e, supported by a bracket or arm. The ends of the
main shaft and of the counterspindle are prolonged so as to project beyond their
bearings, e, and are adapted to receive change wheels; the plain driving pulley, g,
has fast to it the first motion pinion, i, and runs freely on the counterspindle, and
the first motion wheel, ¹, and second motion pinion, j, are united by a barrel, o,
and run freely on the main shaft. By this arrangement, the main shaft can only
be driven from its back end by the change wheels. When driven treble geared,
as shown, motion is communicated from the driving pulley and first motion pinion
by the barrel wheel and pinion to the counterspindle and its keyed second motion
wheel,, and the change pinion on its prolonged key-fitted end, as arranged
for taking the longest stroke and slowest speed. When-driven single geared, the
barrel wheel and pinion are slid along the main shaft out of gear with pinion, i,
and wheel, 1, and the driving pulley is locked to the wheel, j¹, as arranged for
taking the shortest stroke and quickest speed.
In the arrangement represented in Figs, 13, and 14, a main spindle, a, (which
communicates its motion to the main ram or slide driving disc shaft, with its
large spur driving-wheel-in-the-usual manner) and one counter-spindle, b, are
carried in bearings, e, in the body of the machine, and bearings, e, on an arm
cast with the body. The ends of the main spindle and of the counterspindle are
prolonged so as to project beyond their bearings, e, and are adapted to receive
change wheels. By this arrangement, the main spindle can only be driven by tlie
change wheels, the driving pulley being-keyed-to-the-counterspindle, the smallest
change pinion is shown on the projecting end of the counterspindle, as arranged
for taking the largest stroke and slowest speed, and the series of change wheels
are successively reversed until the smallest change pinion is on the projecting end
of the main spindle for taking the shortest stroke and quickest speed.
In the arrangement represented in Figs. 15, and 16, a main shaft, a, and first
and second counterspindles, b, c, are carried in bearings, c, el, the former of which
is supported by a bracket and the latter of which forms part of the standard of the
machine, and the ends of all such spindles are prolonged beyond their bearings and
adapted to receive interchangeable wheels. The three pulleys, g, are loose on
the main spindle, one is fast to the first motion pinion, i, another is fast to the
pinion, t, and the intermediate one acts as an idle pulley for stopping the machine.
When the prolonged key-fitted ends of the counterspindles are connected by the
change wheels as shown, the machine is driven quadruple geared and motion is
transmitted from one of the outer pulleys, g, the under one in Fig. 16, and first
motion pinion, i, to the second counterspindle through the first motion wheel, ',
and second motion pinion, j, which are fast together and run freely on the first
counterspindle, and the second motion wheel, 1, which is keyed to the second
counterspindle, and the main spindle is driven by the fourth motion pinion, k,
and wheel, k, as arranged for travelling the table at the slowest rate of speed to
suit the hardest material operated upon. The table is reversed through the upper
pulley, g, pinion, t, wheel, t¹, second counterspindle, and through the change wheels
to the main spindle as when driving the table. When the prolonged key-fitted
ends of the second counterspindle and the main spindle are connected by the
change wheels the machine is driven treble geared, the main spindle then being
driven by a change wheel, from the under pulley through the gearing, i, i, j, j,
and the table returned through gearing, t, t, and the change wheels to the main
spindle.
The advantages obtained by the prolongation of the ends of the spindles,
in such single, double, treble, quadruple, quintuple or other multiple geared
machines, conjunctively with the use of the reversible series of change wheels,

page_text: directly applicable to the projecting spindle ends, and interchangeably applicable
for connecting the respective spindles, and used alone or in conjunction with the
whole or with part of the gearing between the shaft and spindle bearings, as
described, are the facility with which the speed of the main spindle can be
regulated according to the work to be performed and the great number of different
speeds obtainable and the small intermediate and regular gradations thereof
from the slowest to the quickest between the different gears, whilst also enabling
such machines to be driven by a uniformly driven plain driving pulley, wheel or
shaft in the machine. The advantage due directly to the plain driving pulley in
its application to the improved driving gear is that (for a given size of machine)
it admits of the pulley being of a relatively large diameter considerably greater
than that of the mean of the diameters of a step cone pulley usable with
a like size machine and also of a much greater width than that of the single steps of
a cone pulley, thereby enabling a broad belt to be used, and, being initially driven
at a uniform speed, the power is constant and transmitted with greater certainty,
and a uniform cut can be taken at all speeds of the main spindle or shaft.
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 machines of the nature aforesaid, a main spindle or shaft and a counter-
spindle so adapted that the ends of the spindles are prolonged so as to project
beyond their bearings and are adapted to receive change wheels, a reversible series
of change wheels applicable to such projecting spindle ends and serving to connect
the same is required according to the various speeds and purchases required,--a
broad plain cylindrical driving pulley of one diameter, and gearing connecting
the spindles between the bearings thereof; as hereinbefore described, by way
of example, with reference to Figs. 1 and 2; 9, and 10; and 11, and 12; of the
drawings.
2. In machines of the nature aforesaid,- -a main spindle or shaft and a counter-
spindle so adapted that the ends of the spindles are prolonged so as to project
beyond their bearings and are adapted to receive change wheels, a reversible
series of change wheels applicable to such projecting spindle ends and serving to
connect the same as required according to the various speeds and purchases
required, and a broad plain cylindrical driving pulley of one diameter; as
hereinbefore described, by way of example, with reference to Figs. 13, and 14;
of the drawings.
3. In machines of the nature aforesaid,--a main spindle or shaft and counter-
spindles só adapted that the ends of the spindles are prolonged so as to project
beyond their bearings and are adapted to receive interchangeable change wheels,-
a reversible series of change wheels interchangeably applicable to such projecting
spindle ends and serving to connect the same one with another as required accord-
ing to the various speeds and purchases required, a broad plain cylindrical driving
pulley of one diameter, and gearing connecting the spindles between the bearings
thereof; as hereinbefore described, by way of example, with reference to Figs. 3,
and 4; of the drawings.
4. In machines of the nature aforesaid,-a main spindle or shaft and counter-
spindles so adapted that the ends of the counterspindles are prolonged so as to
project beyond their bearings and are adapted to receive interchangeable change
wheels, a reversible series of change wheels applicable or interchangeably
applicable to such projecting spindle ends and serving to connect the same with
each other or one with another as required according to the various speeds and
purchases required, a broad plain cylindrical driving pulley of one diameter,-
and gearing connecting the spindles between the bearings thereof; as herein-
before described, by way of example, with reference to Figs. 5, to 8; of the
drawings.
5. In machines of the nature aforesaid,--a main spindle or shaft and counter-

page_text: spindles so adapted that the ends of the spindles are prolonged so as to project
beyond their bearings and are adapted to receive interchangeable change wheels,-
a reversible series of change wheels interchangeably applicable to such projecting
spindle ends and serving to connect the same one with another as required accord-
ing to the various speeds and purchases required,-three plain cylindrical pulleys
of one diameter one outer one for traversing the table another outer one for revers-
ing the table and an intermediate idle pulley, and gearing connecting the spindles
between the bearings thereof; as hereinbefore described with reference to Figs. 15,
and 16 of the drawings.
"
17
ated this 16th day of May 1899.
DAY, DAVIES & HUNT,
Chartered Patent Agents, 321, High Holborn, London, W.C.,
Agents for the Applicant.