Improvements in or connected with Lathes or Machines for Making Sorews and similar artioles.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Lathes or Machines for Making
Sorews and similar artioles.
A communication by CONRAD M. CONRADSON, of Madison, in the County of
Dane and State of Wisconsin, United States of America, Mechanical Engineer.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E., of the Agency for
Foreign Patont Solicitors, 6 Lord Street, Liverpool, and 6 Bank Street, Man-
chester, both in the County of Lancaster and 323 High Holborn, in the County
of Middlesex, Civil 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 lathes or machines designed more particularly for the
manufacture of scrows and similar articles, although the invention is applicable to
other classes and styles of machines.
The object of the present invention is to provide a machine most of the move-
ments of which may be controlled by any suitable fluid, such as air, gas; steam,
water, elcelera.
In the accompanying drawings ;-
Figure 1 is a side elevation of a portion of a screw-cutting lathe showing the
improvements applied thereto;
Figure 2, a top plan view of the same;
Figure 3 an end view;
Figure 4 a back side view;
Figuro 5, a vertical longitudinal central sectional view through the turret and
its actunting mechanism ;
Figure 6 a top plan view partly in section, of the cylinder and piston and
attendant parts designed for actuating the turret slide ;
Figures 7 and 8, respectively, face and end views partly in section, showing the
general arrangement of the valve mechanism and the stop bar;
Figure 9, a vertical transverse sectional view through the cylinder and main
valvo for the same;
Figures 10 and 11, longitudinal sectional views through the regulating valvo
showing the latter in different positions ;
Figure 12, a horizontal sectional view through the rear end of the cylinder and
valve chaniber;
Figures 13 and 14 longitudinal sectional views showing the main valve in
different positions ;
Figure 15 a top plan view, partly in section, of the portion of the turret slide
and attendant mechanism;
Figure 16 a front face view of the saine ;
Figure 17, a longitudinal vertical section through the turret ;
Figure 18, an enlarged side or face viow of the stop bar and the rocking block
which said stop bar is designed to actuate;
Figure 19 an end view of the same;
Figuro 20, a top plan view partly in section of the rocking block adapted to be
actuated by the stop bar; and
Figure 21, a face view of the same, partly in section.
A indicates the main frame or body of the machine upon which is mounted an
elongated cylinder B extending lengthwise of the machine, as clearly shown in
Figures 5 and 6. Mounted within this cylinder is a piston C, which; as shown in
Figure 5, is preferably made in the form of a cylindor closed at both ends, and
connected directly or indirectly to the turret slide D, which carries the rotatable.

page_text: turret E. The turret E is adapted to turn or rotate about a vertical axis F and
is provided near its base with a neck G which is toothed circumferentially as at H,
Figures 5, 15 and 17. This tubular neck and the teeth H cut therein are designed
to form and net as worm-wheel, and to be engaged by a worm I secured upon a
shaft J extending transversely across the turret slide as shown in Figure 15. At
its forward end, the shaft J carries a similar worm K which engages a worm-
wheel L of the same size as the worm-wheel H of the turret E, as shown_in
Figures 15 and 16; while at the rear end the shaft J is provided with a gear M,
which engages a smaller gear N secured upon a sleeve T encircling a stud or
shaft O projecting rearwardly. from the turret slide D. Mounted upon the sleeve T
is a band whoul P which is clamped between two collars QQ by means of a nut R
and a spring disc or washer S, as clearly shown in Figure 15.
Ordinarily the rotation of the band wheel P will effect the rotation of the collar
or sleeve T; but, should the parts meet with any unusual obstruction, the band
wheel will overcome the force of the spring washer S and turn or rotate upon the
sleeve or collar T without imparting motion to the gearing M N, etcetera. The
worm-wheel L, which has already been referred to, is secured at the forward end of
a stop bar U, Figures 1, 2, 3, 15 and 16, which is journalled in arms or brackets V
projecting from the frout side of the turret slide D, the construction and arrange-
ment being such that, at each rotation of the turret, the stop bar will be turned or
rotated a corresponding distance. Mounted on the front side of the turret-slide
parallel with the axis of the stop-bar U is a longitudinally sliding rod W, whose
forward end is adapted to engage an arın or finger X secured to the sliaft J, as
clearly shown in Figures 15 and 16 and thereby prevent the rotation of this
shaft at certain predetermined intervals.
The gearing H, and K, L is so proportioned that, at each rotation of the
shaft J, the turret and the stop-bar will each be turned or rotated through an arc
of 60°, and, at the end of this movement, further rotation of the shaft, the turret,
and the stop-bar is prevented by reason of the rod W engaging the stop or pin X
secured to the said shaft J. The rod W is provided with a block Y carrying a
stud or roller Z, as clearly shown in Figures 1, 2, 7, 15 and 10, which latter is
designed to be actuated by means of a cam plate A' secured to the rear end of the
stop-bar U, as shown in said figures.
It will be noticed, upon reference to Figures 15 and 16, that this cam-plate A' is
provided with a series of bevelled faces or cams B' corresponding in number to the
faces of the stop-bar and of the turret, so that, when the turret is rotated to bring
a new tool into position, the corresponding face or cam B' of the cam-plate A¹ will
be brought to bear upon the stud and actuate the rod W. The rod W extends
rearwardly a short distance, where it is connected to the upper end of a vertical
lover C pivoted to the turret-slide, as clearly shown in Figure 7; the lower end of
said lever C projecting downwardly in such position as to be struck at certain
intervals by a stop-block D' adjustably secured upon a rod E' which serves, as
hereinafter set forth, to actuate the maiu valve of the fluid pressure apparatus.
The stop-bar U is provided on its respective faces with a series of cams or blocks F'
which are adapted to be set at any desired position lengthwise of the said bar, as
clearly shown in Figures 18 and 19, said cams F being slotted, as also shown in
said figures, to permit the application to their outer faces of supplemental cams G
for the purposo about to be explained. In the rear of the cains F' G' are secured
to the faces of the stop-bar a series of stops H', which are rendered adjustable
lengthwise upon the stop bar by means of bolts I¹, and which are rendered adjust-
able in themselves by having their striking points formed of screws or bolts .J.
From this construction, it will be seen that a wide range of adjustment is secured
for the several stops or cams of the different faces of the stop-bar.
Extending lengthwise of the machine parallel with the axis of the stop-bar is a
rockshaft K, upon which is secured a block L' which carries two sets or series of
pins M' and N. The number of these pius M' and N' corresponds to the number
of faces of the stop bar and of the turret, and they are arranged in two rows

page_text: extending in a direction transverse to the axis of the stop-bar, as shown in
Figures 18 and 19. Each pin M' and N' is rendered independently adjustable as
to height by means of the scrows O' as shown in Figuros 18, 19 and 21. This
block L' is arranged directly under the stop-bar U as shown in Figure 19, so that
the cams F¹ and G' may act upon the pins M' and ' as the said stop-bar is fed
along. As the stop-bar moves lengthwise toward tho block L, the bevelled nose
of the large cam F¹ will strike one of the pins M' or N' and depress the block L',
that is, it will tip or rock said block and the shaft K' to which it is secured, as
indicated by the dotted lines in Figures 19 and 21. As the stop-bar continues to
travel forwardly, the secondary stops G¹ secured to the stop-bar will strike the
pins N' and further depress or rock or tip the block and cause a further rotation of
the shaft K'.
It will he noticed, upon reference to Figures 20 and 21, that the block L' is
adapted to slide lengthwise a limited distance relatively to the rockshaft K', ɛo that,
as the stop-bar U continues the movement before alluded to, the stops or cams H¹
will, when they strike au abutment O' secured to the upper face of the block L',
move said block lengthwise a limited distance and carry with it the main valve
shaft E. Of course the cams F', G' and H' are adapted to be mounted upon the
stop-bar at various points throughout the length of the latter, and hence it will be
seen that the regulating-valve-shaft K' will be rocked or tipped carlier or later in
the travel of the stop-bar and the turret slide to which said bar is connected,
according to the length of travel it is desired to give the turret slide when operating
with a particular tool. It is also apparent that the main valve shaft E will be
actuated at a point sooner or later in the travel of the turret-slide according to the
position of the cams or stops H' upon the rotary stop-bar, their position being
depondent niso upon the character of the tool in the corresponding face of the
turret.
The sliding motion given to the rod E' by the engagement of the stops H
and O' effects not only a change in the position of the main valve, but also effects
a sudden rocking or tipping of the lever C, and a longitudinal movement of the
rod W which carries the stud Z engaging the cam-plate A' on the rotatable
stop-bar.
The longitudinally reciprocating bar E' is connected at its rear end with an
upright lever P, which latter is connected at its upper end with the main regulating
valve Q as shown in Figures 1 and 7. Lever P' is provided on its rear face with
an arm Q' carrying a roller R', which latter is designed to engage or be acted upon
by ono or more stops or teeth S secured to a disc T frictionally held in engage-
ment with a shaft U, as shown in Figure 8, by means of a nut V1 and a spring
washer W. These teeth or projections S are removable and may be applied at
various points throughout the periphery of the wheel or disc T' so that they shall
come into engagement with the lever P or its arm or roller at predetermined times.
Pivoted to the lever P¹ is a small elbow lever X', one end of which carries a set
screw Y designed to come into engagement with a portion of the framework,
while the other end is formed into a hook Z', which is adapted to engage the
cross-bar of the weighted bell crank lever A', as clearly shown in Figure 7. The
upper end of this elbow lever A is designed to come into engagement with a series
of adjustable stops or teeth B' also secured to the disc or wheel T', as shown in
Figures 7 and 8.
When the arm Q of the lever P is bearing upon the smooth face or periphery
of the wheel or disc T', the albow lever X' has its hook end Z' in engagement with
the elbow lever A'; but, as the wheel or disc T' rotates, one of its teeth S³,
coming in contact with the roller or arm of the lever P, movos said lever backward
away from the disc, and as it thus moves it causes the lover X' to be rocked upon
its pivot and its hook-end to be thrown out of engagement with the lever A'. As
soon as thus released, the lever A' rocks upon its pivot and its upper end is thrown
into engagement with one of the teeth B' of the rotatable wheel or disc, and provents
further rotation of the Intter.

page_text: The rockshaft K' carries at its rear end a radial arm C², which is connected by
means of a link D' with the regulating valvo E³, as shown in Figure 9, so that, as
the shaft K' is rocked or oscillated by the action of the rotatable stop-bar upou the
block L', the said valve E will be brought to one of the three positions illustrated
in Figures 9, 10 and 11. The reciprocating rod E', which is connected to the
main valve Q, is adapted to bring the said valve to either of the three positions
shown in Figures 12, 13 and 14.
It will be noticed, upon reference to Figures 9 and 12, that the regulating
valve E is arranged vertically between the rear end of the main cylinder and the
main valve, and comprises merely a hollow spindle having a series of lateral
orifices F and G which are designed to be brought into communication respectively
with the passages H and 1'. The passage I' at the upper end of the valve com-
municates with the cylinder through the lateral passage J³, Figure 9, while the
chamber or passage H communicates with the main valve chamber K, as clearly
shown in Figures 9 and 12. When the regulating valvo is closed, the openings I
are brought out of alignment with the chamber or passago H, and hence no fluid
can pass from the main valve chamber into the hollow stem of the regulating
valve. When, however, the valve is lowered, as in Figure 11, only a small number
of the openings F are brought into communication with the passage H³, and
bence only a small quantity of the fluid can pass through the regulating valve into
the cylinder.
In Figure 9 the regulating valve is shown wide open with all of the openings
brought into the space or chamber H, and hence the full force of all the fluid
employed may be utilized in the cylinder. The main valve box or shell is provided
with two series of perforations or holes L' and M', the former of which communi-
cates with the space or chamber K', while the other M' communicates with the
outlet pipe N as clearly shown in Figures 12, 13 and 14.
In Figure 12 the main valve is shown with the inlet port L' wide open and the
outlet port M' closed.
In Figure 13 the inlet ports L' are shown closed, while the outlet or exhaust
port Mis open.
In Figure 14 both the inlet and outlet ports are closed by the valve.
Upon reference to Figure 6 it will be noticed that there is a pipe O' communi-
cating with the forward end of the cylinder, so that, under all circunstances, the
forward movement of the cylinder is against the pressure of the fluid admitted by
the pipe O in front of the said piston. This arrangement is adopted for the
purpose of securing a return of the piston to its normal position when the exhaust
port of the main valve is open.
During the forward movement of the turret and its slide, it is desirable that the
turret should be prevented from turning or rotating, and, to secure this result, a
locking pin P' is employed, which, as shown in Figures 5 and 17, is carried by the
turret slide and adapted to engage successively the series of sockets or recesses Q
formed in the turret. This pin is held up in engagement with the turret by means
of a coiled spring R³, and is provided at its lower end with an inclined slot S',
which, when the turret slide comes back to its normal position preparatory to
making a new cut, engages an inclined lug or projection T secured upon the upper
face of the cylinder, as shown in Figures 5 and 17. As the lug or projection T
enters the groove S, it draws the pin P' down out of engagement with the turret,
thus freeing said turret and permitting it to be turned by hand or by power, as may
be desired.
As soon as the turret slide begins to move forward, the lug or projection T³ is
withdrawn from the slot or groove S, and the spring K' throws the pin up into the
socket Q which is at that time directly over the pin; thereby preventing any
further rotation of the turret relatively to its slide.
In order to provide for the constant rotation of the band-wheel P during the
travel of the turret, the arrangement of belting shown in Figure 4 is provided.
Upon reference to this figure, it will be seen that at the opposite ends of the main

page_text: frame are arranged band pulleys U and V' about which and about the band-
wheel P passes the driving band or belt W'. The turret slide is provided with
guide pulleys X', while the main frame of the machine is provided with a corre-
sponding wheel or pulley Y' which serves to properly guide and support the hand
or belt as the turret-slide moves back and forth. From this construction and
arrangement it will be seen that the turret slide may move back and forth while
the band W continues to rotate continuously.
The shaft U' carries at the back of the machine a large gear wheel U³ which
meshes with a smaller gear U (shown in Figure 2) secured upon the shaft U* to
which the band-wheel U is secured, hence it will be seen that the shaft U' will
at all times have a slow rotary movement, sometimes with its disc T' and some-
times independently of the disc T', according to whether or not the disc is held
against rotation by the engagement of the elbow lever A' with one of the
teeth B.
The operation of the machine is as follows :--
Fluid under pressure is admitted to the rear end of the cylinder B, through
pipe N, the fluid of course passing around the main valve Q and through the
regulating valve E, on its way to the cylinder. This admission of fluid to the
cylinder, acting through the piston C, causes the turret slide D with attendant
parts to be carried forward toward the headstock of the machine. The shaft V³,
Figure 4, being put in motion, causes, (through belt W and genring U³, U', U'
and U) a slow rotation of the shaft U', the dise T of which is held against
rotation by means of the elbow lever A'. The band wheel P is also put in notion
by the bolt W, but, as the shaft J is held against rotation by ronson of the bar or
shaft W engaging the_stop X, (Figures 15 and 16) the said wheel P will turn
freely upon the sleeve T without imparting motion to the gearing that rotates the
turret and the stop-bar. As the carriage or alide D moves forward as described,
one of the cains F' on the stop-bar U strikes the particular piu M' which had
been previously set to correspond with tho particular tool in the operating face of
the turret, and depressos or rocks the block L' in which said pin is mounted. As
the block is keyed to its shaft, this depression causes the shaft K' to turn or rock
slightly, and, in thus turning, to raise the free or outer end of its radial arm C
which is connected with the regulating valve E, and bring the valve to the partly-
closed position indicated in Figure 11, thereby reducing the speed of the turret
slide automatically. It will be observed that there are as many pins M' as there
are faces on the turret, and, as these pins are independently adjustable, the block
may be actuated or depressed to a greater or less extent as circumstances may
require; or any one of the pins may be adjusted so low as not to be affected by the
cam on the stop-bar, in which case no partial closing of the valve E' will take
place. The same is true of the pins N which, na the turrot slide continues to
advance, are struck by the supplemental cams G' of the stop-bar. When theso
pins N' are thus struck, the block to which they are secured is further dopressed,
and the shaft K', onrrying the radial arm C (connected to the valve E') rocked so
as to bring the valve to the closed position shown in Figure 10. Just at the
instant that this is accomplished, the stop or block H' on the stop-bar U strikes the
lug or stop O' of block L' (see Figures 18 and 19) and moves the said block L'
lengthwise of the shaft K' to which it is keyed; and, as the block is thus moved,
it causes a longitudinal movement of the main-valve-shaft E. This shaft E', being
connected to the valve Q' through the elbow lever P', causes the said valve to be
brought to the position shown in Figure 14, that is, to a position where the fluid is
neither admitted to nor allowed to escape from the cylinder, thereby causing the
turret slide to remain momentarily at rest. As the elbow lover P is rouked
through the movement of rod E, the smaller elbow lever X will also be rocked,
as before explained, and its hook 'Z' thrown down out of engagement with tho
weighted elbow lever A', which latter, being in engagement with one of the
teeth B', has held the disc T against rotation. The release of the lever 'A' by
the lever X' niso effects a release of the wheel or disc T', and allows the latter to

page_text: turn with its shaft U₁. In this turning, one of its teeth or projections S' strikes
against the arm Q of lever and moves said lever backward, bringing the main
valve Q to the position shown in Figure 13; that is, with the inlet closed and the
exhaust opened. The fluid now escapes from behind the piston C of the turret
slide, and the pressure of the fluid on the front end of the piston returns the slide
toward its normal or starting point. As the slide D moves backward, the incline T
engages the grooved pin P and withdraws the latter from the turret, so that the
turret may be turned upon its axle, ns now to be described. It is to be observed
that, when the lover P is rocked by the action of one of the teeth S' of the
wheel T, the rod El is also moved toward the head-stock of the machine; but, in
thus moving, its block D¹, striking against the lower end of the levor C¹, rocks
the lever and moves the rod W lengthwise out of engagement with the stop X on
the turret shaft J. The instant that the shaft J is released, the band-wheel P
(which, in the meantime, has been rotating continuously) imparts motion to said
shaft Jas before described, and affects a rotation of the turret and the stop-bar U.
As soon as the turret has been turned or rotated the required distance, one of the
inclined cam faces B' of cam A', acting upon the roller Z of block Y, Figures 7,
15 and 16, moves the rod W lengthwise into engagement with the shaft or the
lug thereon, and prevents further rotation of the turret and stop-bar U. But, as
the rod W is thus moved lengthwise by the cam-plate A, the lever C¹ is again
rocked, and its lower end, coming into engagement with the block D', moves the
rod E' and the valve Q' to the position shown in Figure 12. This movement of
rod E' (and lever P¹) causes the levers X' and A' to assume their normal positions.
The slide is now ready to be advanced for a new cut.
If the teeth S and B' of wheel T' are set close together, as shown in Figure 7,
the lever pl will be rocked instantly upon the release of wheel T', but, if theso
teeth be set quite a distance apart, the tooth S' will actuate the lever Pla
considerable time after the lever A is thrown out of engagement with the
tooth B'. Under the first of these arrangements, where the teeth S' and B' are
set close together, thore will bo practically no dwell at the end of the travel of
the turret slide; but, under the second arrangement, where the teeth are set far
apart, there is a considerable time or dwell during which the turret alide remaius
stationary. This is a feature of importance, as it is thereby possible to secure a
dwell of any desired extent in the motion of the turret slide, which is a matter of
special value in facing.
By providing the stop-bar U with cams corresponding to the tools employed in
different faces of the turret, and by providing a separate adjustable pin Mor N¹
for each face of the stop-bar, a variety of adjustments is secured not attainable in
any other construction.
By the employment of fluid-pressure-mechanism to actuate the turret, the
ordinary lead-screw, heretofore used universally in this class of machines, is
dispensed with; and screws of different pitch may be manufactured or cut by
moroly varying the adjustment of the regulating valve, instead of substituting,
for one lead-screw, another of a different pitch as has heretofore been the
practice.
While the piston is shown as connected directly to the turret slide, this is not
essential, any other form of connection serving to transmit motion from the piston
to the slide being within the scope of this invention. So too, instead of having
the turret or tool post slide move toward and from the headstock, this arrange-
ment may be reversed, and the headstock connected directly or indirectly with the
piston or cylinder, and arranged to move toward and from the tool-post slide.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, 1 declare that what I claim is :—
1. In a lathe, the combination, with the main frame and a tool-post carriage, one
of said parts being connected with a cylinder and the other with a piston to not

page_text: with the cylinder, of a fluid-pressure mechanism for causing a travel of the tool-
post carriage relatively to the main frame.
2. In a lathe, the combination, with a main frame, of a tool-post carriage
provided with a piston, a cylinder to receive the piston, and means for controlling
the admission of a fluid to and the exhaust from the cylinder.
3. In a lathe, the combination, with a main frame, of a cylinder mounted
lengthwise thereof, means for controlling the admission and exhaust of a fluid to
and from the cylinder, and a tool-post or turret carriage movable lengthwise upon
the bed or frame and provided with a piston to work within the cylinder.
4. In a lathe, the combination, with a main frame, of the turret slide_mounted
thereon, fluid-pressure mechanism for reciprocating the turret slide, and a muin
controlling valve actuated by the turret slide.
5. In a lathe, the combination, with a main frame, of the turret slide mounted
thereon, fluid-pressure mechanism for reciprocating the slide, and a regulating
valve actuated by the turret slide, whereby a variation in speed is secured.
6. In a lathe, the combination, with a main frame, of the turret slide mounted
thereon, Huid-pressure mechanism for reciprocating the turret slide, and a main
controlling valve and a regulating valve both operated by the slide.
7. In a lathe, the combination, with a main frame, of the turret slide provided
with a turret, fluid-pressure mechanism for reciprocating the turret slide, a stop bar
journalled in the slide and geared to rotate with the turret, and valve mechanism
actuated by the stop bar.
8. In combination with turret slide D, turret E provided with worm-wheel H;
shaft J provided with worm I, and gear M; stud 0; sleeve T provided with
gear N; and a band wheel frictionally secured to the sleeve.
9. In combination with turret slide D and turret E, a shaft J for rotating the
turrot, provided with a stop X; a stop bar U geared to rotate with the turret ;
a rod W adapted to engage the stop ✗; and a cam plute A' rotating with the stop
bar and adapted to actuate the rod W.
10. In combination with turret slido D, a fluid-pressure mechanism for actuating
the same provided with a main valve and an operating rod as E'; a turret ; a stop
bar U geared with the turret; a rod W adapted to engage the turret-actuating
shaft Ja cam. A' mounted upon the stop bar to move the rod W in one direction;
a lever connected to the rod; and a block D' mounted upon rod E' to rock the
lever and thereby move rod W in the opposite direction.
11. In combination with a main frame, a turret slide thereon, fluid-pressure
mechanism for actuating the latter, a main valve and its reciprocating rod E', the
regulating valve and its rock shaft K', a block L' mounted upon shaft K' and
connected with rod E', and a stop bar provided with cams to depress the block
and rock the shaft and to move the rod E' longitudinally.
12. In combination with a main frame, a turret slide thereon, fluid-pressure
mechanism for the latter, a main valve rod E, a rock shaft K' for regulating. the
valve, a block L' mounted upon the shaft K' so as to slide lengthwise and also to
turn therewith, and connected to rod E¹, a stop bar provided with two sets of
cams F' and G' to act successively to depress the block L' and rock the shaft K',
and also with a cam or stop H¹ to engage the block and effect a reciprocation of the
rod El.
13. In combination with the shaft K', the block L' keyed thereto and provided
with the pins M' and N³, and a stop bar U provided with the cams F' and G¹ to
engage the pins.
14. In a lathe, the combination of a main frame, a turret slide mounted thereon,
fluid-pressuro mechanism for reciprocating the slide, a regulating valve E' for the
pressure mechanism, a block L' secured to the shaft of said valve, a series of pina
carried by the block, and a stop bar provided on its different faces with cams to
engage the respective pins.
15. In a lathe, the combination of a main frame, a turret, and a turret slide
mounted thereon, fluid-pressure mechanism for actuating the slide, a regulating

page_text: valve E provided with a rock shaft K', a block L' secured to the shaft and
provided with pins M' corresponding in number with the turret tools, and a stop
bar geared to rotate with the turret and provided with cams to correspond to the
pins M!.
16. In a lathe, the combination of a main frame, a turret slide mounted thereon,
fluid-pressure mechanism for actuating the slide, a main valve for said mechanism,
adapted to be actuated or moved in one direction by the turret slide, and means
such as wheel T¹ for also moving the valve, whereby a dwell is secured at the end
of the travel of the turret slide.
17. In a lathe, the combination of a main frame, a turret slide mounted thereon,
fluid-pressure mechanism for actuating the slide, and controlling manns subs.antially
such as shown and described for causing a variation in the rate of travel of the
Blide.
18. In a lathe, the combination of a main frame, a turret slide mounted thereon,
fluid-pressure mechanism for actuating the slide and controlling means substantially
such as shown and described for causing a dwell at the end of the travel of the
slide.
19. In a lathe, the combination, with a main frame, of a turret slide mounted
thereon, fluid-pressure mechanism for actuating the slide, a main valve Q' for said
mechanism provided with a lever P, a rotating shaft U provided with disc T',
teeth S and B applied to said disc, and means for holding the disc against rotation
adapted to be released by the movement of the valve or its rod or lever.
20. In a lathe, the combination, with a main frame, of a turret slide mounted
thereon, fluid-pressure mechanism for actuating the slide, main valve Q', provided
with rod E' and lever P', the elbow lever A' pivoted to the frame, the lever Xi
pivoted to lever P₁ and adapted to engage the lever A', a rotary shaft U', a
disc T mounted thercon and adapted to turn therewith when released, and
teeth 8 and B' secured to the disc and adapted to engage, respectively, the
levers P and A'.
21. In a lathe, the combination, with turret slide D and a fluid-pressure mechanism
for actuating the same, of a main valve Q provided with a rod E, a turret, a stop
bar geared-thereto, a rod W to engage the turret actuating shaft J, a cam A
rotating with the stop bar to actuate the rod W, a lover C, connected with the
rod, a block D' secured to rod E' to engage the lever C, and means such as
disc T for moving the rod, all substantially as shown and described.
22. In a lathe, the combination, with a main frame, of a turret slide, a feed
mechanism for the latter, a rotatable turret, gearing for rotating the turret, a
continuously rotating band wheel P forming an element of the turret gearing, a stop
mechanism which holds the turret-rotating-gearing out of action, and means for
automatically withdrawing the stop at a predetermined point in the travel of the
turret slide.
23. In a lathe, the combination, with a main frame, of a turret slide and a
rotatable turret, means for actuating the slide, gearing for rotating the turret, a
stop which prevents the operation of such gearing, a looking pin P for the turret,
and means substantially such as shown for withdrawing the pin and also the stop.
24. In combination with a turret slide and a fluid pressure mechanism therefor,
a main controlling valve, and an interposed regulating valve, whereby a variation
in the speed of the slide is attained.
25. In a lathe, the combination, with a main frame, of the turret lide mounted
thereon, the head stock and fluid pressure mechanisin, substantially such as shown
and described, for reciprocating the turret slide, or the head stock.
Dated this 30th day of January 1893.
WM. P: THOMPSON & Co.,
Agents for the Applicant.