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Патент USA US2118020

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, May 17, 1938.
‘
M. s. CURTIS
MACHINE
TOOL
2,118,020
'
‘
Original Filedbct. 31, 192'} ' . l8_Sheets.-Sheet' 2
1 ‘May 17, ‘1938.
'
‘
1
M. s. CURTIS
2,118,020
MACHINE'TOOL
‘
Original Filed Oct. 51, 1927
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ATTORNEY.
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May 17, 1938.
2,1 18,020
M. S. CURTIS
MACHINE TOOL
Original Filed‘Oct. 51, 1927
‘
BY
18 Sheets-Sheet 4,
'
INVENTORJ_
W1.J,
ATTORNEYJ v
‘
May 17, 1938.
M. S. CURTIS
2,1 18,020
MACHINE TOOL
original Filed Oct.’ 31, 1927
9K
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1s Sheets-Shéet 5 .
May 17, 1938.
'
'
_
M. s. CURTIS
2,118,020
MACHINE,‘ TOOL
‘
Original Filed-Oct. 31, 1927
l8-Sheets-Sheet 6 v
INVENTORS
BY
WAY.
ATTORNEY.
_
May 17, 1938'.
2,118,020
-M. s. CURTIS
'
MACHINE
TOOL
‘
Original Filed Oct. 31, 1927
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May 17, 1938.
M. S. CURTIS
2,1 18,020
MACHINE TOOL
Original Filed 001;. 31, 1927
18 Sheets-Sheet 9
Meiecén
Value
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60/8? Pressure Va/ue
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INVENTORS
.5000 Volume
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May 17, 1938.
Ms CURTI'S
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MACHINE‘ TOOL
INVENTOR.S_
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May 17, 1938.
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Original Filed Oct. 51, 1927
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May ‘17, 1938.
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‘MACHINE-TOOL
Original Filed Oct. 51, 1927
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May 17, 1938;
2,118,020
M. s. CURTIS
MACHINE 'rbon
Original Filed Oct; 31, 1927
18 Sheets-Sheet 16
‘
BY
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May 17, 1938._
M. s. CURTIS
MACHINE TOOL
‘
Original Filed Oct. 31,_ 1927 '
2,118,020 I
l8 Sheets-Sheet 17
INVENTORJ
By
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May 17, v193s.
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MACHINE'TQOL
Original Filed- Oct. 31, ‘1927
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MOTOR
PUMP
’
PUMP
Patented May 17, 1938
2,118,020 .
, UNITED STATES
PATENT OFFICE
2,118,020
MACHINE TOOL
Myron Shirley, Curtis, Pawtucket, R. L, asslgnor
to William Wallace Potter, Pawtucket, It. I.
Application October 31, 1927, Serial No. 230,119
Renewed June 12, 1937
-
n
59 Claims. '
The present invention relates to means of op-‘
erating machine parts hydraulically by ?uid pres
sure and controlling, said operation electrically
and is particularly adaptable to machine tools.
' Asa matter of convenient designation the term
“hydraulic” will be used in referring to any ?uid
simultaneously with the .high pressure and low
volume, as during the actual work motions;
(3)_ a single pump for- a number of machines;
(4) a single valve means for controlling the work
movements of more than one unit actuating 5
means or servo-motor; (-5) a metering device con
trolled by a work-moving part or tool slide and
agency used.
The advantages of hydraulic operation of ma- _ which regulates the quantity of ?uid and, hence,
the rate of movement of the part or member con
chine tools are generally well-known, such as cerned; (6) means, for automatically controlling 10
10 simplicity of construction and elimination of
breakage. However, so far as they have been
developed, hydraulically operated machines have
certain disadvantages-some of which, for ex
ample are, (1) providing, as is customary, a pump
15 for each cylinder or_ servo-motor, which has its
own control valve for controlling both the direc
tion and the amount of ?ow of the ?uid, all of
which entails great expense and complicated con
struction and increases liability to derangement;
20 (2) where a single pump is employed to operate
‘a. plurality of said servo-motors, it must not only
have capacity enough to furnish the necessary
volume when all units are operating simul
taneously on the idle movement, but also must be
capable of delivering fluid at 'a su?iciently high
pressure for feeding movements, thus, when the
pump is delivering high pressure ?uid in low
volume for feeding motions the excess capacity
must be dissipated through a relief valve with
‘ a huge loss of efficiency; ‘and (3) with mechanical
control as is now employed, di?iculties arise with
the control-mechanism which‘ must be actuated.
by the slide or moving member itself and, where
there are more than one such members and where I
their motion may be in any combination of
directions, the matter of control is very di?icult
and costly;
'
The object of this invention is to provide a con
struction free from the objections before men
20 tioned and having the minimum number of parts,
certainty or reliability of operation and the possi
bility of utilization in a variety of machines.
A further object of the invention is the pro
vision of a machine having, among others which
' will appear as the speci?cation proceeds, the fol
lowing characteristics: (1) a single pump that
takes care of any number of operating units of a
machine,‘ (2)_ a pump mechanism which delivers
?uid under certain‘ conditions of" operation at
the operation of said valve means from the
movement of work-performing parts whereby the
sequence of operation of said parts is governed;
('7) means for manually controlling each opera
tion of said valve means from one or more re- 15
mote points; (8) controlling the valve operations
or movements by mechanism‘ which will cause
delayed action under conditions which require it
which are usually, but not necessarily, at the end’
: of the working stroke; (9) hydraulic clutch shift- 20
ing means actuated by the work-operating‘ parts _
‘to change the speed of spindle rotation; and
,(10) automatically operated safety devices for
stopping the operation of the machine upon
' variation in either the
hydraulic or control cir- 25
cuits or upon failure thereof.
-
In the drawings the invention is‘ illustrated for
the purposes of example only in connection with
a vertical type,‘ single spindle, center turning
tool-machine. Although it may be embodied in ‘In
similar machines using chucks instead of cen
ters; machines of the platen type, in which the '
tools are mounted on a flat plate or platen and
which have chucks for holding the work; auto
matic turret lathes, both vertical and horizontal; 35
multiple spindle station-type chucking machines;
.drill presses, or in fact, any type of machine tool
where there is a relative feeding movement be
tween the work and the tools for operating on
the work.“
'
40
The invention consists of whatever is described '
by or is included within the terms or scope of
the appended claims._‘
In the drawings:
‘
'
'
'
Figure 1 is a front elevation of such machine 45
tool;
'
Figure 2 is a side elevation;
,
' -'
‘
-r
.
'
Figure '3 is a horizontal section on the line 3-3 '
of Fig. 2;
,
» '
Figure 4 is a section on the line H of Fig. 3;‘ 50
high pressure and low volume during, or to effect,
Figure 5 is a partial side view looking in the’
the actual work operations of the machine and,
which under other conditions, delivers ?uid at low ' direction of the arrow 5 in Figs. 1. or 3 with the
side wall removed to show the pump drive.
pressure-and in large volume as during the non
‘Figure 6 is a vertical section on thelline 6-6 of
working or idle motions, oralso delivers or may
deliver ?uid at low pressure and large volume
Fig. 4 with parts in elevation;
55
2
2,118,020
Figure 7 is a detail view in section of the spindle
and pump drive with parts spread out or sepa
I 49, a plurality of tool holding slides 44 and hy
draulic devices 1! connected with the pump
rated for clearness of illustration;
Figure 8 is a detail view in section through the
cylinder 28 for operating the spindle clutches;
53-54 through pipes All! and “I for actuating
said slides.
Figure 9 is a front view with parts in section of ’
a portion of the machine shown in Fig. 1;
Figure 10 is a side elevation of Fig. 9 in the
direction» of the arrow III, with parts in section;
Figure 11 is a section through the tail-stock
' substantially on the line ll—ll of Fig. 1.
Figure 12 is a plan view of the tail-stock.
.
Figure 13 is a section on the line l3—|3 of
Figs. 11 and 12;
15
‘
Figure 14 is an end elevation of a cross slide
looking in the direction of the arrow in Fig. 1;
Figure 15 is a section on the line i5-l5 of
Fig. 14;
'
V
Figure 16 is a plan view of the cross slide former
20 cam;
Figure 17 is a section through the clutch con
trol valve substantially on the line l1—|1 of
Fig. 14;
’
Figure 18 is a section similar to Fig. 17 showing
25 a diiferent position of the valve;
Figure 19 is an elevation somewhat diagram
matic illustrating the general arrangement of the
elements of the hydraulic organization;
a
Figure 20 is a similar view to illustrate the elec
30 .trical devices and their circuits;
Figure 20a is a detail view showing the ar
rangement of the switch operating detents of the
control valve;
'
'
Figure 21 is a longitudinal section through the
35 compound control valve substantially on the line
.
There are two slidable carriers 31, one for each
tool-slide and each mounted upon verticalguide
way 38a on the column 38 and on opposite sides a
of and parallel with the live-center H a. For
convenient designation, the carriers 31 will here
after be termed "carriages”. The tool slides 44 10
are each swiveled to its carriage 31 so that it may
be adjusted to feed at any desired angle relative
to the work on the centers Ila and I51 and,
since their sliding movement in the type of ma-_
chine illustrated is generally crosswise, they will 15
be termed “cross slides” for convenient identi?
cation. Associated with and constituting a part
of the control means of the hydraulic apparatus
are electrical devices, including switches that are
automatically actuated at appointedtimes by the 20
hydraulically moved member and also manual
switches.
-
I
It is preferred to make the machine base II
and column 38 separate castings or units because
thereby'they can be interchanged with corre
sponding units to alter-the type of machine and
thus secure an important manufacturing advan
tage. Thus, all the parts placed in the base may
serve equally well with the parts of a variety of
machines‘ which are mounted on the column. 30
‘For example.‘a vertical turret lathe and a platen
type machine are similar as to the spindles and
chuck and gearing mounted on the base "I as
sociated
therewith,
and—hence—a
column
equipped with a turret and cross slides could be 35
for a like column equipped with the
Figure 22 is a cross section through the control substituted
tail-stock
I49
and carriages 31 or with a platen,
valve substantially on the line 22-—22 of Fig. 21.
and a chuck may be substituted for the “live
Figure 23 is a section of the control valve on
2|-2l of Fig. 22;
center" Ila. The base and~column, when made
separate, will be tied by vertical tension bolts or 40
rods R, as indicated in Fig. 2.
.40 the, line 23-23 of Fig. 22;
Figure 24 is ._a layout of the ports of the rotary
control valve;
Figures 25 to 31, inclusive, are views somewhat '
Spindle and spindle drive
diagrammatic illustrating the various positions
The machine base housing It has mounted in
45 of the rotary control valve and the direction of _ it a vertical spindle H (see Figs. 1, 2, 4 and 6)
?ow of ?uid therethrough;
45
Figures 32, 33 and 34 are detail'views of the with a work center II a and is journaled by roller
bearings
I
2
near
top
and
bottom.
A
worm
gear
metering valve;
'
13 is ?xed to the spindle to rotate the same and
Figures 35, 36 and 37 are‘ detail views of a de
is driven by a worm ll keyed to a horizontal shaft
50 vice for delaying circuit closing of the switches;
I 5 (see Fig. 7) which, by several trains of gear
Figures 38 and 39 are diagrammatic views of
50
switch arrangements that may be employed for ins, may be driven at various speeds so that the
speed
of
the
spindle
may
be
varied.
These
trains
control of the operation of the control valve;
include hand change gears It on- shaft I 5 and
Figures 40 to 47, inclusiv ,are detail views of a parallel shaft 11 and two automatically con
55 a form of control valve that may beemployed;
Figure 48 is a diagrammatic view showing yet trolled trains, which latter include ( 1) a gear II
. another construction of the control valve and
electrical control devices therefor that may be
used;
60
.
.
; .
on shaft l1 meshing with a pinion is loose on a 55
drive shaft", and (2) a gear 2| having a roller
ratchet clutch connection 21a (Fig. 7) vwith the
shaft l1 and which meshes with a pinion 22 ?xed
Figure 49 is a view diagrammatic in nature il
lustrating the employment of an accumulator in > to drive shaft 2|. The two gears 18 and 21 on
the hydraulic arrangement;
Y
Figure 50 is an elevation, somewhat diagram
matic with parts in section illustrating a con
65 struction of machine in which the several cylin
ders have their own metering valve.
' 4
The single spindle center turning machine,
_ the shaft 11 and their meshing pinions are of
diiferent sizes so that’ the speed of the shaft l1
may be either of two speeds.
The loose pinion ~
I! is adapted to be automatically clutched to
and unclutched from. the drive shaft 20 and, 65
when it is clutched thereto, the shaft I1 is driven
therefrom and runs away‘ from roller ratchet
gear‘ 2|. When pinion I9 is- unclutched from
selected to illustrate, by way of example, an em
bodiment of the invention, is illustrated in‘ its
shaft 20, the shaft I1 is driven by pinion 22 and
70 general construction and details in Figures 1 to "ratchet gear 2|. The clutch for pinion I! is a
70
18. Described generally, said machine comprises
a base housing 18 containinglth'e liver spindle II, friction clutch 23 of usual construction, operated
. its driving mechanismiFi'gs. 3,6 and 7), the by a cone'thimbie 24, slidable on the drive {shaft
20. Cone thimble 24 is engaged by a yoke 25
.75
‘hydraulic pump iHhav-vcolumn 38 extending
abovethe base ll and supporting the tail-stock
?xed to a rod 2‘, one end of which rod is con
nected to a piston 21 (see Fig. 8) in a hydraulic 75
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