Improvements in Automatic Lathes.
Year: 1898

page_text: Date of Application, 1st Feb., 1898-Accepted, 31st Dec., 1898
COMPLETE SPECIFICATION.
Improvements in Automatic Lathes.
We, CHARLES PERRY BALL, Superintendent of Bicycle Factory, and WILLIS GOWDY,
Bank Cashier, both of Thompsonville, County of Hartford, and State of Connecticut,
United States of America, 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 statements :—
Figure 1 is a plan of the machine. Fig. 2 is a side elevation. Fig. 3 is an end
elevation. Fig.4 is a cross-section on line W W. Fig. 5 is a cross-section on line X X, that
part of the bearing b and the spindle B through which the section line passes not
being shownFig. 6 is an enlarged sectional plan through the spindle. Figs. 7
to 58, inclusive, are detailed illustrations of parts which will be referred to later on.
The machine which we describe gages, finishes, and cuts off its work and feeds
itself by the automatic action of the different parts. The material which is
used for stock is fed to the machine in long rods, which are run through the
spindle.
We do not claim anything original in the spindle or in the manner of feeding the
stock, as we propose to make these parts of the machine similar to those already in
use; but we insert a brief description and illustrations of the spindle in order to
show how the machine feeds itself, and also in order to show the connection between
this part of the machine and other parts which we do claim as original.
B is the tubular spindle, revolving in bearings a and b on the main frame and
driven by the pulley C, between which latter and the bearing b a washer N is inter-
posed, while a wear-nut M stands at the opposite side of the pulley. The end of the
spindle projecting beyond the bearing carries a washer O, beyond which it is
enlarged, as at 1, and its interior is also here enlarged for the reception of the tapering
hollow steel collet E. The latter is split at its outer end, as at r, to form jaws, which
grasp the work, as at 8, as will be understood, while its inner end is threaded, as at t,
onto the tubular plunger F. Through the latter passes the feed-pipe G, split at its
forward end, as at x, to form jaws w, for grasping the work within the plunger F,
while its rear end carries the head H, formed with the groove l.
The spindle B is slotted, as at u, from its inner end p to the nut L, and the
plunger F is keyed by projections v to these slots.
J are pawls pivoted at o to the finger-block K, which is adjusted by the nut L, one
end of the pawls engaging the projections and the other end riding on the
spheroidal surface n of a sleeve I, which is journaled loosely on the spindle and
formed with a groove m.
P is a bracket whose end y, Fig. 8, is mounted in the frame and whose body z is
angular, as seen in Fig. 7, and onto the body are fitted for sliding the grooves a¹ of
the feed-pipe slide Q and the plunger-slide T, Figs. 9 to 12. The former has an
arm b, engaging the groove in the head H, and the latter an arm c¹, engaging the
groove m in the sleeve I. On pins S and S¹ in these slides are mounted rollers R
and R¹ respectively, adapted to be engaged by cams V, Y, A', and B on the drum U.
(See Fig. 2.)
The drum U is keyed to the drum shaft C¹, and the method of driving this shaft is
one of the original features of our invention. It has been customary on machines of

page_text: this class to drive the drum shaft C¹ by a belt from the countershaft independent of
the belt which drives the spindle-pulley C. Practical experience has demonstrated that
there are several serious objections to this manner of driving the drum-shaft and has
also shown that a definite ratio should be maintained between the speed of the spindle
and the speed of the drum-shaft. Such a speed ratio cannot very well be maintained
by driving one independently of the other by means of belts, but it can be maintained
by driving the drum-shaft from the spindle by means of intermediate gearing in the
manner which we will now describe.
The worm D on the spindle B drives the worm-wheel D¹, which is keyed to the
upright shaft E¹. The cog wheel F is keyed to the lower end of this shaft and drives
the cog-wheel G¹, which is keyed to the hub of the bevel-toothed wheel H¹. The
bevel-toothed wheel H¹, revolving on the stud I¹, drives the bevel-toothed wheel K15,
which is keyed to the drum-shaft C¹. As the worm D revolves very fast, a special
device is necessary to keep its surface lubricated. As shown in Figs. 13 and 14, the
cover J¹ fits into a recess in the body of the worm-wheel D¹ and covers an annular
reservoir z, which may be filled with any convenient absorbent. A channel connects
the reservoir z with the interior of the hub of the worm-wheel D¹, and through it oil
can run from the reservoir to lubricate the bearing of the shaft E¹. A boss e¹ of
rectangular cross-sections projects from the cover J¹, with a filling-nipple 1 on its
center. The nipple is tapped with a pipe-thread of suitable size to receive any
desired oil-cup. The recess in the boss e¹, is connected by channels g¹ g¹ to the
oil reservoir in the worm-wheel D¹, so that the oil can be regularly supplied
to this reservoir in any desired quantities. Small holes h¹ h¹, &c., are drilled
from the flanks of certain teeth into the reservoir 2¹. These teeth thus provided
with oil-passages should be evenly distributed and there should be enough of them
to secure a suitable lubrication of the worm D.
The drum-shaft C¹ carries the cam-disk M¹. Two pieces of steel N1 and 0¹,
commonly called "cams," are bolted on opposite sides of this disk to strike levers K¹
and L¹. The usual position, arrangement, and shape of these parts are shown
in Fig. 5, but we have devised an improved form of cam and lever, described
below.
As will be seen, the shape of the cams N¹ and 01 are such that as the cam-disk
revolves in the direction indicated by the arrow 5 that part of each cam which first
strikes the opposing lever is nearer the center of the cam-disk than that part of the
cam which is last in contact with the opposing lever. The lever K¹ is hung on the
pin Y¹, (having one end y¹ threaded and the other end z¹¹ formed into a handpiece,)
being suspended at the front side of the machine and at the proper position with
reference to the cam-disk M¹, so that as the cam-disk revolves the cam N¹ will strike
the lower end of the lever K¹. A lever L, similar to K¹, is suspended by means of a
pin Y, constructed the same as Y¹, from the back side of the machine at a proper
position so that as the cam-disk revolves the cam 0¹ will strike the lower end of the
lever.
The cams N¹ and 01 are of such shape and so adjusted on the cam-disk that the
action of each is to force outward from the center of the machine that end of the
lever with which it comes in contact, and they are also adjusted so that only one of
them is in contact with the lever at any time, so that when the lower end of one lever
is being forced outward the lower end of the opposite lever is free to swing inward
toward the center of the machine. When the lower end of the lever K¹ is forced
outward, the upper end swings inward and striking the adjusting-screw Q¹ in the
cross-carriage P₁ it drives the cross-carriage P¹ in the direction indicated by the
arrow 3, Figs. 5, 28 and 29. When the lower end of the lever L' is forced outward,
the upper end of the lever swings inward, striking the boss i¹ on the carriage P¹,
which forces the carriage P' in the direction indicated by the arrow 4.
The car-
riage P¹ has two T-slots j¹, j, in which the tool-holders are clamped, as will be
explained hereinafter. The carriage P¹ fits over a T-shaped projection on the
frame, (Fig. 30), which holds and guides the carriage in its travel, as shown. The
forward and backward movements of the carriage are. for the purpose of feeding

page_text: the tools on either side of the center. The tool C on the back end of the carriage or
the end from which the boss ¹ projects, we will suppose, is used only for cutting
off the work, and no very fine adjustment is required to govern the travel of the
cross-carriage P₁ in the direction indicated by the arrow 4. The tool B on the
front end of the carriage, we will suppose, is expected to form and gage the work,
and very fine adjustments are required to regulate the travel of the carriage when
moving in the direction indicated by the arrow 3.
The cam N¹ should be so located on the cam-disk M that the throw of the
lever K will be about right to drive the carriage P" so far as desired in the
direction of the arrow 3. If, however, the carriage should travel a little too far or
not quite far enough, the travel can be regulated by turning the set-screw Q¹, which
is adjusted in one end of the carriage, as shown.
A set-screw is adjusted in a hole in the frame at right angles and opposite to
the set-screw Q', a short plug W₁, of brass or other soft metal, square at one end and
round at the other as shown in Figs. 41 and 42, being fitted into this hole, one end
of the plug W¹ being in contact with the threads of the set-screw Q¹.
The adjustment of the set-screw Q₁ regulates the travel of the carriage P¹ only so
far as the travel of the carriage is due to the action of the lever K¹; but as the
carriage P¹ may continue to be drawn forward by the action of the tool after the
lever K¹ has ceased to drive it it is necessary to have some independent and positive
device on the carriage which will stop its travel at the instant the lever K¹ ceases to
drive it.
Attempts have been made heretofore to stop the travel of the carriage by a set-screw
which is so adjusted in the carriage that the end of it will strike some fixed surface
on the frame of the machine at the instant the lever K¹ ceases to drive the carriage;
but a set-screw is not readily adjusted to one-thousandth of an inch and some finer
adjustment is required.
We secure a very fine adjustment in the following manner: The lever K¹ is hung
from the lug, which projects from the frame. The pin Su is passed through the
lug, the center of the pin being about on a line with the edge of the T-shaped
projection, and that part of the pin which projects beyond the lug toward the
carriage being supported by a semi-circular recess in the end of the T-shaped
projection, said semi-circular recess in the end of the T-shaped projection ¹ being
a continuation of and of the same radius as the hole in the lug l, in which the
pin S is inserted. At one end of the pin S", as shown in Figs. 32 to 35, inclusive,
à surface m is milled, said surface being cut at a slight angle to the center of the pin
and the inclination of the surface being toward the lower end of the pin S" when it
is in position. At right angles to the surface m the surface n¹ is milled, also at a
slight angle to the center of the pin, the inclination of the surface being toward the
upper end of the pin S when it is in position. The inclination of these two
surfaces m¹ and n toward the center of the pin S should be the same, although
pitched in opposite directions. A groove o¹ is turned in the lower end of the pin Su
to fit the collar of a collar-screw X, which is adjusted by a screw-thread in the lug
at a suitable distance from the pin S". Below the groove of the shape of the pin Su
is adapted to give sufficient clearance to the head of the collar-screw X', and at the
end four flat surfaces are milled at right angles to each other, so that the pins may
be turned by a wrench. Two grooves q and being, respectively, at ninety degrees
from the centers of the two surfaces m' and 'run lengthwise the pin. The locking
set-screw U is adjusted by a screw-thread in the frame at right angles to the pin S",
and the end $1 of the set-screw U¹, Fig. 38, is made to fit the groove q¹ and r¹ on the
surface of the pin S. The set-screw R¹ passes through the lug t, extending from
the carriage opposite the pin S. The surface on the end of the set-screw R¹ is
cut at such an angle that it may be adjusted so as to be parallel to the opposite
surface m or n¹ on the pin S. The set-screw R' is adjusted by a screw-thread in a
square nut Z, and it is held in position by the check-nut A". The edge of the
nut Z is in contact with the lug t, so that it is prevented from turning. The outer

page_text: end of the set-screw R¹ is slotted, so that it may be adjusted in the nut Z¹ by a
screw-driver.
Two grooves v¹ and w¹. Fig. 31, run lengthwise and on opposite sides of the
set-screw R¹, and into either of these grooves the end a¹ of the locking set-screw V1
is fitted. The locking set-screw V₁ is adjusted by a screw-thread in the lug t¹ at right
angles to the set-screw R¹, Fig. 28. The location of the two grooves v¹ and w¹ and
the position of the locking set-screw V₁ are so determined with reference to the
beveled face u¹ on the end of the set-screw R¹, and the position of the set-screw U¹ is
so determined with reference to the beveled surfaces m¹ and n¹ on the pin S¹, that
when the end of the locking set-screw V₁ is adjusted in the groove of the set-
screw R¹, and when the locking set-screw U¹ is adjusted in the groove of the pin S¹,
the surface u¹ on the end of the set-sciew R₁ is parallel to the surface n¹ on the
pin S¹, and when the set-screw R¹ has been turned half a revolution and the end of
the locking set-screw V₁ is fitted in the groove v¹, and when the pin S¹ has been
turned one quarter of a revolution and the end of the set-screw U' is adjusted in the
groove q¹ the surface u¹ on the end of the set-screw R¹ is parallel to the surface m¹
on the pin S¹.
The carriage P¹ will travel in the direction indicated by the arrow 3 until the end
of the set-screw R' strikes the surface n¹ of the pin S¹ if the pin S and the set-
screw R¹ are in the positions indicated in the drawings. As the drawings show, the
surfaces m¹ and n on the pin S¹ are somewhat longer than the surface u¹ on the set-
screw R. When, as shown in the drawings, the surface n¹ on the pin St is opposite
the surface u on the set-screw R', if the pin S¹ is raised towards the carriage P¹, and
the part of the beveled surface which is farthest from the center of the machine is
brought opposite the surface u¹ on the end of the set-screw R', the carriage P¹ will
not be allowed to travel quite so far as before in the direction of the arrow 3. If the
pin S¹ is lowered, the carriage P will be allowed to travel a little farther in the
direction of the arrow 3.
Figs. 28, 29, and 30 are respectively a plan, side elevation, and end elevation of
the carriage Pi, together with a partial section of the machine, such as would be made
on line ZZ, looking in the direction indicated by the arrow 1. Fig. 31 is an end
elevation of the set-screw R¹.
The forming-tool B₁ should be made of cylindrical shape, as shown, and with the
cutting edge to conform to the shape of the model of the work which the machine is
expected to reproduce.
The forming-tool B11 has a cylindrical shank which is fitted into the hole all of
the tool-holder D¹¹.
Figs. 18, 19, and 20 are respectively plan, side elevation, and end elevation of the
tool-holder D11.
Figs. 21, 22 and 23 are respectively a plan, side elevation, and end elevation of
the base-plate E¹¹.
Figs. 24 and 25 are a side and end elevation of the adjusting-screw Fl.
Figs. 26 and 27 are side and end elevations of the plug Gu
The hole c, at a suitable distance from the hole all, is drilled through the upright
flange of the tool-holder D, and the upper end of this hole is recessed or
counterbored at a diameter large enough to extend slightly into the hole all, as shown.
From the lower surface of the tool-holder D a round boss el projects, which is con-
centric with the hole el. The boss e fits into a corresponding recess 2 on the
surface of the base-plate E" when these parts are in position.
The screw F is short in proportion to its diameter, and at each end there are
projections and of less diameter than the threaded surface. The projection "l
being slotted, the screw F11 may be adjusted by a screw-driver. A semicircular
recess f¹¹, of suitable size to receive the screw 11, is made on the under side of the
tool-holder D and at each end of this recess f", and concentric with it, are smaller
semicircular recesses g¹¹ and h¹ of suitable size to receive the projections j and k¹¹
of the screw F. The depth of these semicircular recesses is such that when the
screw F¹ is inserted small segments of each thread project below the lower surface

page_text: of the tool-holder D¹. Small segments of thread are cut on the surface of the
base-plate E of a depth and pitch suitable to receive the projecting segments of
the screw F11 The segments of thread 11 are cut on a curve with the center of the
hole as a center, and the distance from the center of the hole to the center of
each segment being equal to the distance from the center of the hole c¹¹ to the center
of the semi-circular recess f¹¹.
When the tool-holder Dit is on the base-plate E", with the projection el adjusted
in the hole and with the screw F adjusted in the semicircular recess fi¹, the
operator can swing the tool-holder D" on the base-plate E" by inserting a screw-
driver and turning the screw Fl. It is assumed that the screw F1 will be inserted
in the recess f, so that the slotted end of the screw F" will be toward the outside,
so that the operator can turn it by a screw-driver.
The hole is slightly elongated, so as to allow the tool-holder D₁ to be swung
on the base-plate E with the boss ell as a pivot. The hole is drilled through the
base-plate E through the center of the circular recess i¹¹. The hole 11 is drilled
through the base-plate E", the distance between the centers of the holes and o
being equal to the distance between the centers of the holes c¹ and m
holder D. The projection ell on the lower side of the base-plate E
the upper part of the slot j' in the tool-carriage P¹.
in the tool-
is made to fit
A cylindrical plug G₁ of a diameter suitable to fit the recess in the tool-
holder D is bored out with a hole p¹ of the same diameter as the hole c¹¹ in the
tool-holder D and the hole n¹¹ in the base-plate E¹¹. A small part of the cylindrical
surface of the plug G is cut away, leaving a curved surface q", the radius of the
curve being equal to one half the diameter of the hole all in the tool-holder D¹¹.
When the cylindrical shank of the tool Bu has been placed in the hole a¹¹ of the
tool-holder D, the plug G¹ is so adjusted in the recess of the tool-holder D11
that the curved surface q¹¹ comes in contact with and perfectly fits the cylindrical
surface of the shank of the tool B¹¹.
Figs. 15 and 16 are respectively an end and side elevation of the bolt H¹.
The head of the pivotal bolt H" is made to fit the larger portion of the slot j¹
in the carriage P¹. When the parts are assembled, the pivotal bolt His passed
through the hole n¹¹ in the base-plate E", the hole in the tool-holder D¹¹, and
the hole pin the plug G", and when a nut has been screwed onto the threaded end
it binds all these parts together and clamps the base-plate Ell to the carriage P¹.
I, Fig. 17, is a shorter clamping bolt, the head si of which is also made to fit the
larger portion of the slot j¹ in the carriage P¹. When the parts are assembled, the
clamping-bolt I is passed through the hole oll in the base-plate E" and through
the hole m¹ in the tool-holder D, and when a nut has been screwed onto the
threaded end it binds these parts together and clamps the base-plate E" to the
carriage P. Two lugs h and i, project from the frame. Two round bars J¹ and K¹¹
extend from the lugs and i, being firmly fastened in both lugs. A back-rest
holder L is fitted to slide on the bars J and K.
Figs. 43, 44 and 45, are respectively a side elevation, plan, and front elevation of
the back-rest holder L".
Two bars M and N of rectangular cross-section are adjusted and held in sub-
stantially a rectangular aperture Nui in the holder L". The two surfaces t¹¹ and ul
on the lower ends of the bars M and N", respectively, are at right angles to each
other when the bars M and N are in position and are intended to be in contact
with the revolving stock. The groove in the upper end of the bar M" and the
groove win the upper end of the bar Nu are fitted to receive the collars 11 111 of
the collar-screws 0011, which are adjusted in the holder L" at suitable distances
from the bars M" and N and by their adjustment regulate the position of the
bars M and N. Two set-screws P P are so adjusted in the holder L" as to hold it
in position on the bars J" and K". The back-rest bars M1 and N thus have a
complete adjustment both lengthwise and crosswise the machine, and the two
surfaces t¹ and u¹¹ can be readily adjusted so that each comes in contact with the

page_text: stock as it revolves, thus preventing undue vibration and also holding the stock
against the cutting edge of the tool.
The lever K¹, as shown on Sheet 1, is rigid at both ends, which is the usual
construction. It frequently happens, however, that operators so adjust their
machines that the travel of the carriage P¹ is checked before the lever K¹ has quite
finished its stroke, thus straining the machine and sometimes breaking the lever K¹.
For the purpose of overcoming this objection we have devised the improved form of
lever Q¹¹, as shown in Figs. 54 and 55. A flat spring R is fastened at one end to
the front edge of the lever Q by the bolt S, and thence extends, with a
suitable curve, to the back edge of the lever Qu, where it is fastened to the lever by
the bolt T and is also held in place by the nut U¹¹ on the set-screw VII.
The set-screw V is adjusted by a screw-thread in the lever Q", and one end rests
against the rear face of the spring R", so as to furnish a means of regulating its
tension. The lever W is hung by a spring X to the lever Q. The pin X" is held
in place by a nut Y11, which is screwed up to a shoulder on the pin X". The pin X"
is fitted to turn easily in the lever Q", so that the lever W" will swing on the surface
of the lever Q. A pin Z extends from the lever W" parallel with the pin X", and
when in position it is in contact with the spring R, as shown. Lines are cut at
regular spaces on the surface of the lever Q under the end of the lever W11, so as to
form the scale yll, the purpose of which is to indicate the contraction of the spring R
by the throw of the lever W, as shown by the scale 1. The spring R should be
. stiff enough to drive the carriage P¹ without yielding at all if the machine is properly
adjusted; but it will yield and prevent breaking or overstraining the machine if
the travel of the carriage P¹ is checked before the movement of the lever is
completed.
Instead of attaching a spring to the lever we may accomplish the same purpose by
combining a spring with the cam which drives the lever. Figs. 52 and 53, show a
device of this kind.
A is a cam-disk which may take the place of the cam-disk M', as shown in Figs.
2 and 5, Sheets 1 and 2.
B is a cam which may take the place of the cam N¹, as shown on the cam-
disk M¹.
An elliptical spring C¹¹ is adjusted back of that part of the cam B which is
farthest from the center, the other end of the cam being hung so as to swing on the
pin D, which is screwed into the cam-disk A¹¹¹. The spring C is enlarged at
one end to form a boss ; which is tapped with a right-hand screw-thread in the
hole (See Figs. 50 and 51.) The double-threaded screw E, Fig. 58, is
threaded nearest the head with a right-hand thread of a diameter and pitch to fit the
hole a in the boss of the spring C. The other end g of the screw is of
diameter small enough to be thrust through the thread of the hole a¹¹ and is threaded
with a left-hand thread. The screw E is adjusted in the drum-shaft. C by its left-
hand thread and is adjusted in the boss all by its right hand thread, thus holding the
spring C in its position. As the screw E is adjusted in the shaft by a left-hand
thread, if it is turned to the right it will be withdrawn from the shaft, and as it is
adjusted in the boss by right-hand thread turning it to the right will force the
boss 211 toward the head of the screw. The screw E is so adjusted as to hold the
spring Cagainst the two pins F and G
The spring C may be elongated and its tension increased by so adjusting the
screw E as to force more of the spring CH between the two pins F and G
The pins F and G are screwed into the cat-disk A¹¹. The pin His passed
through the slot 611 in the cam B1 and is screwed into the cam-disk A1 in such a
position with reference to the slot 611 that it will not interfere with slight movements
of the cam B1, but will prevent the cam from dropping off the disk in any part of
the revolution of the drum shaft.
The spring C should be stiff enough not to yield unless to prevent breaking. or
overstraining the machine, when it will yield enough to relieve the strain of the
lever.

page_text: Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what we
claim is :-
1. The worm-wheel D having an annular oil-reservoir in its body and holes leading
therefrom outward to its teeth and to the interior of its hub; combined with a cover
removably closing said reservoir, a rectangular hollow boss thereon, channels con-
necting its interior with the reservoir, and a nipple carried by the boss for receiving
the oil-cup, as and for the purpose set forth.
2. In a lathe, the combination with the carriage having a screw; of the frame on.
which the carriage moves, a pin in the frame at right angles to the length of said
screw, such pin having an inclined surface contacting with the point of the screw and
a groove around its outer end, a collar screw parallel with the pin with its collar
entering said groove, and means for locking the pin after adjustment, as and for the
purpose set forth.
3. In a lathe the combination with the carriage having a screw; of the frame, a
pin in the frame having two differently-inclined surfaces at angles to each other.
adapted to contact with the point of said screw and two longitudinal grooves parallel
with said surfaces, means for adjusting the pin longitudinally, and a locking set-
screw adapted to engage one of said grooves, as and for the purpose set forth.
4. In a lathe, the combination with the carriage having a screw; of the frame, a
pin in the frame having two inclined surfaces at different angles to the axis of the
pin and at angles to each other adapted to contact with the point of the screw,
means for adjusting the pin longitudinally and axially, and a locking set screw.
adapted to engage the pin after its adjustment, as and for the purpose set
forth.
5. The combination of the frame, the tool-carriage with the screw having two
longitudinal grooves, and the locking set-screw adjusted in the carriage at right
angles to and in contact with the said screw, the inner end of the locking set-screw
being adapted to fit said grooves, as and for the purpose set forth.
6. In a lathe, the combination with the frame having an adjustable pin; of the
carriage moving on the frame and having a lug, a set-screw through the latter at
right angles to said pin and having the face of its contacting end beveled, means for
adjusting said set-screw longitudinally, and a locking set-screw for holding it in
adjusted position, as and for the purpose set forth.
7. In a lathe, the combination with the frame having an adjustable pin with an
inclined inner end; of the carriage, a set-screw therein at right angles to said pin,
means for adjusting said screw, and a locking set-screw for holding it in adjusted
position, as and for the purpose set forth.
8. In a lathe, the combination with the frame, and the carriage moving thereon;
of a longitudinally-adjustable pin in one member have a beveled surface, and a
longitudinally-adjustable set-screw in the other member at right angles to the
length of said pin and having the face of its contacting portion beveled at the same
inclination as that of the pin, as and for the purpose set forth.
9. In a lathe, the combination with the frame, and the carriage; of a longitudinally-
adjustable pin in one member having a beveled surface, and a longitudinally and
axially adjustable set-screw in the other member at right angles to the length of
said pin and having the face of its contacting portion beveled, as and for the purpose
set forth.
10. In a lathe, the combination with the frame, and the carriage; of a longi-
tudinally-adjustable pin in one member having two differently beveled surfaces, and
a longitudinally-adjustable set-screw in the other member having the face of its
contacting portion beveled, as and for the purpose set forth.
11. In a lathe, the combination with the frame, and the carriage; of a longi-
tudinally-adjustable pin in one member having two differently-beveled surfaces, a
longitudinally and axially adjustable set-screw in the other member having the face
of its contacting portion beveled, and means for locking this set-screw against move-
ment after adjustment, as and for the purpose set forth.

page_text: 12. In a lathe, the combination with the base-plate having a hole and a segment of
threads in its face around the hole; of the tool-holder mounted on the plate and
pivoted in said hole, the lower face of the holder having a recess with concentric
reduced extensions, and a screw fitting said recess and engaging the threads in the
base-plate and having axial projections turning in said extensions, as and for the
purpose set forth.
13. In a lathe, the combination with the base-plate having a hole through its body
and a concentric enlarged recess at the upper end thereof; of the tool-holder mounted
on the base-plate and having an upright hole, a boss depending from the holder
concentric with said hole therein and journaled in the recess in the base-plate, and a
pivotal bolt through the alined holes, as and for the purpose set forth..
14. A tool-holder having an upright flange with a transverse hole for the tool-shank,
and an upright hole enlarged at one point to form a recess opening into one side of
the transverse hole; combined with a cylindrical plug fitting said recess and having
a cut-away portion projecting slightly into the transverse hole, said plug also having
an upright hole of the size of that in the flange, and a bolt through said registering
holes, as and for the purpose set forth.
15. A tool-holder having a flange with a transverse hole for the tool-shank and an
upright. hole enlarged at one point to form a recess opening into the transverse hole;
combined with a cylindrical plug fitting said recess and having a portion projecting
slightly into the transverse hole, said plug also having an upright hole of the size of
that in the flange, a base-plate, a pivotal and tightening bolt passing through the
alined holes in plug and flange and through the base-plate, and means for adjusting
the remote end of the tool-holder on the base-plate around said bolt, as and for the
purpose set forth.
16. In a lathe the combination with the carriage having a T-shaped slot, and the
-base-plate having a projection entering said slot; of the tool-holder resting on the
plate, a pivotal bolt passing through the holder and plate with its head engaged in
said slot in the carriage, means for turning the holder around said pivot, and a
clamping-bolt also passing through the holder and plate with its head in said slot, as
and for the purpose set forth.
17. In a lathe, the combination with the carriage having a T-shaped slot, and the
base-plate having a projection entering said slot; of the tool-holder resting on the
plate and having an upright flange with a transverse hole for the tool and an upright
hole for the pivotal bolt having a recess merging into the tool-hole, a plug within
the recess bearing against the tool-shank, a pivotal bolt passing through the plug,
holder, and plate with its head engaged in said slot in the carriage, and a clamping-
bolt also passing through the holder and base-plate, as and for the purpose set
forth.
18. The combination of the back-rest rods J, and K", fastened at their respective
ends to the lugs h, and i of the frame A, and the back-rest holder L", adjusted on
the rods J, and K, over the tool-carriage P¹, all constructed substantially as and
for the purpose set forth.
19. The combination of the back-rest holder L", and the back-rest bars M, and
N1, each independently adjusted in the back-rest holder L", and the collar-
screws 011, 011, with their collars 11 x11, made to fit the gooves v¹¹, and 11, in the
back-rest bars M, and N", respectively, all constructed substantially as and for the
purpose set forth.
20. The combination with the back-rest rods, and the holder adjustable thereon
and having a rectangular aperture; of the substantially square back-rest bars passing
through and held in said aperture and having their operative surfaces at right angles
to each other, and means for adjusting these bars longitudinally and independently,
as and for the purpose set forth.
21. The combination with a cam, of a pivoted lever, a spring attached at one of
its ends to the front edge of the lever and curved around one end of the same at a
distance therefrom whereby a space is formed between the spring and end of the
lever, the said spring being attached at its other end to the rear edge of the lever

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an adjusting screw passing through the lever and bearing against
the rear face of the spring substantially as described and for the purpose
specified.
22. The combination with a cam, of a lever having a scale marked thereon, a
spring attached at its ends to the lever and adapted to be struck by the cam to
operate the lever, means for adjusting the tension of the spring, and an indicator
pivoted to the lever with one end moving over the scale, and the other end having a
pin that bears against the inner face of the spring substantially as described and for
the purpose specified.
23. The combination of the lever Q with its scale y the spring R held by
screws to the lever Q the set-screw VI adjusted to regulate the tension of the
spring R and the indicating-lever W pivoted by the pin X so as
to swing on the side of the lever Qu; all constructed substantially as and for the
purpose set forth.
Dated this 1st day of February 1898.
BOULT & WADE,
Agents for the Applicant.