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Патент USA US2118022

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‘May 17, 1938.
M, s. CURTls'
MACHINE TOOL
l l
’-
2,118,022
'
Original Filed F'eb. 9, 1931
7 Sheets-Sheet 1
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ATTORNEY `
May 17, 193s..
M_ s C-URT‘IS'
MACHINE
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2,118,022
TOOL
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original Filed Feb'. 9, 1931 K
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- May 17, 193s.
2,118,022
v M. s. CURTIS
MACHINE 11001J
Original Filed Feb. 9, 1931
_
INVENTOR
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Mayu,A 1938.
2,118,022
4M. s;` CURTIS
MACHINE TOOL
'
Original Filed Feb. 9, 1931
'7 Sheets-‘Sheet 4
V NTOR
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ATTORNEY
May 17,'1938.Í
'
M. s. CURTIS '
'
MACHINE
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' 2,118,022v
TOOL
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original Filed Feß. 9, i931
`'7 sheets-sheet 5
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Elly/Low. ,
ATTORNEY
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May 17, 1938. `
`
‘ M. s. vCURTIS
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MACHINE
Toòi.
original Filed Feb. 9, 1951
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2,118,022
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ATTORNEY
May 17, 1938.
2,118,022
M, s. CUR-ns
MACHINE TOOL
original Filed Feb. v9,l 1931
7 SheetSfSheet 7
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ATTORNEY
wPatented » May 17,119.38
î f 2,118,022
f t' `- UNITED STATES ‘Parral-a1'V `OFFICE _
2,118,022 "
momma 'rooL
Mymi s. cuna, rawtueket, a. 1.,»u’eignei-:e
William >Wallace Potter, Pawtucket, R. I.
Application February a, 1931, serial No. 514,661v
Renewed July 8,_ .1937
(ci, aas-zi
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My'invention consists of improvements in ma-Í4 y -ll‘igure 4 is 'across-section vof- Fig. 3, substanchine tools for turning,`_boring and the like.
'
- tially on the line 4-4;
Figure-iis a iront elevation, enlarged, ofthe .
In my speciiication as an exempliiication vof my
. _
invention, I describe a machine for turning work -tailstocir center and support;
5 f on centers, .but my' invention Vis applicable to l __ll'igureß is a plan view oi Figure 5;
_ Figure 'I is a front elevation ofthe right hand.
other machines, for- example those inA which work
is_he1d in a. chuck. I do not> limit myself to thel hydraulically operated tool slide of Fig. 1;
'.Figure 8 isa plan view of Fig. '1;
center turning type of. machine. Among the~ fea
' tures of my invention and the advantages which » Figure 9 is a sectional view substantially on th
10 >I _obtain by my improvements are:
.
IJMinimum of floor space and ease oi opera# ' Figure 10 is a top view of Fig. l, with the feed
`
` s tion,~by virtue of the vertical construction _em--> .plate cover removed: e
Figure l1' is a front elevation ci the feed plate
i 2. Rigidity andfstrength o; construction, and .and _hydraulic cylinders of Fig. 1, with the cover
.
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cheapness of manufacture and ease of alignment removed;Figure 12 isa sectional view of the tailstock ac
by using bars tovextend between and connect the
15
tuating means and taken substantially on line
, stationary members to constitute _frame meme
_
bers and 'at the same time’make them serve
I2-I2 ofFig. 11; and'
20
3. .Ease .of adaptation to a mechanical feed ma
chine or to a' hydraulic feed machine;
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Figure _13 is a diagrammatic view of the hy
guides vor ways for the slidable machine members; v
draulic cylinders, ',valves, etc., of one slide unit.
_
'I‘he machine, -as illustrated, has two units,
4. Supporting and operating a tailstock. where-- that is, two carriages ‘22, one on the right hand
by theJ.,work'is more rigidly >and securely held
than usual; and the tailstock center is conven
25 iently moved and clamped;
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" I
5. Construction of slides and slide base (or car
riage) whereby one set of slides may be'conven
s iently substituted for another;
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,
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6. Construction whereby the capacity of the
'30 machine may be altered by simply changing the
Ölength of the supporting bars;
'1. 'operation ef' tailstoek center, by immuneA
and the'other onthe left hand side of the ma-vÍ
chine, each having a tool's'lide |06 mounted there
_on and each right and left hand carriage and its 25
@slide _having its separate and necessary operating
mechanisms;.but, as the units are alike in con
struction and functions, although. independent oi
each other, I shall describe the right hand unit‘
only, and like numbers refer`t`o like parts of- the
Base lIl 'has secured _to and extendingmpwar
~ ‘Í A construction oi' Vhydraulic feed control,
3" whereby one or more machines may be oper-~
therefrom. four parallel _posts or bars II and I2,
in- two pairs. » Bars II are each ilrmly held »in Cab 5
ated from an accumulator, with minimum of parts ‘bearings I3 and," in bottom and top of base
¿Il and serve as the main support and guide bars.
and valves;
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9. A metering valve foraI hydraulic system,
which gives an even flow at all degrees of opening '
40 and minimizes or _obviates the effects due to wire
drawing, dirt in the iluid, etc.; and
Bars f2 are each ñrmly heldin bearings I5 inthe - f
top only of base III, and serve'as auxiliary "sup
ports and guides. These bars II and I2 extend
0
upward to the _feed plate I6,- where they are
A
ilrmly held and clamped by bearings I1. By em
ploying 'bars of ‘different length, the height of
,operating the control valves of vthe hydraulic' the machine and, therefore, its capacity`may be
system.
,
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.g5
10. Novel resistance__ valves or regulators lfor
‘ My invention Yconsists- in whatever _is described
¿ by or. is included within the terms or scope of the
appended claims.
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In the drawings:---
5:) _
.
'bodying my invention( with Il‘iydraulic'ally con
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Siidably on the bars I_I and I2 is tailstock sup
port or carriage'it, which may be adjusted to
any desired position by adjusting screw i9,
`
Figure 1 is a front elevation of a machine em
trolled slides;
easily altered.' Preferably, the bars are roun'd in
cross-section.
_
.
l(Figs. 5 and '6) one end of which is lthreaded into ' 50
the tailstock support Il and the other ‘end of »
.which is .fixed in vfeed plate I6, and, when lo
Figure 2 is a side elevation'thereof; ` ‘
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cated 'in the desired> Position, may be securely- l
‘Figure 3 is a partial side velevation of Fig. l, - _clamped by means of caps 2li, and binder screws
,55 looking in> the direction of the arrow in Mg. l;
'2I. The carriages 22 (Figs, 1, 2, 'l and 8) also
.
55
2
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misma -
.
may be slidably mounted on each pair of .bars
|| and l2, respectively. Each carriage 22 is made
with a removable cap 24 (see Fig. 8) so that they
' may be easily and convenientlyv attached and re- `
moved. These are described fully hereatnter.
The base I0 contains the spindle operatingmechanism; the feed plate I6 supports the/feed
joperating mechanism and _the tailstock support
|„6 supports ‘the tailstock 56.
10
`
heid from twisting' with re‘lrztion toètahspœk 5s
by'stud 12, which also ser s the same purposel
fordthe second clamping plate 13 which is oper- .,
atedby stud 66 and pinion’v60'. Rod 10 is free
to slide in body 56, between collar 15 threaded to
rod 19 and 'stop button 16, with which the end
ot roet 10 contacts;Y Spring 11, held between
collar 16 on rod_16 and cap 19 on body 56,._tends
.to hold body 66 and rod 10 in therelative posi
‘ tion shown.l Instead of the center 60, the tail
Base construction and spindle df'ióey d `
10
stock mayV carry a tool or other work engaging“
Basev lu is formed with ax rim or 11p z5, which
element.
forms a container for chips, the bottom of which> Y' > Operation is asjollows: Assume the tailstockv
- is S0 sloped that the Chips tend to slide down body 56 to be inthe position shown which isat` f over the' lip 26 into- the removable chip pan 21 . the top end of its stroke with nut v61 `loosened by 15
4us
(Fig. 2).
‘
rack 69 and pinion 66. >A piece of work is placed
,
Parallel with the bearings -|3 and I4, and the
bars Il, is a vertical spindle 26, journalled in
bearings within bearing surfaces 29 and 66 (see
Fig. 4). -Located in the bearing surface 29, and
'2o'
on the spindle center 26a in such a position that
downward movement of the tailstock body will
cause center 66 to engage a center hole in the
end of- the „work-piece when rod 16 is moved 20
fastened to the base I0, by screws 3l, is bushing downwards, aslhe'relnafter described. As clamp
32, in which is fixed by means 0f €841 33. Outer ' .ing plates 1| and 13 are now loose, body 56 is
bearing race 34, of an anti-friction bearing, the
' , inner- bearing race 35 oi which is on the spindle
26.
.25
.
.
Slidably but not rotatably located Jin bearing
surface 30 is bushing 36, containing the outer
l race 31 of an anti-friction bearing, the inner
race 36 of whichis Aon the spindle 26.
,
suspendedvby'?od `1|; tm-Qugh nut 15 and plate
19. Therefore.- when rod 16 is moved downwards
. by means hereinafter described, the combination 25
of the weight of body 56 and the compression oi
spring 11 causes body- 56 to> move downward
carrying the center 60 against the work and
bringing body 56 to rest.` Further movement of
Keyed to'spindle 26 is gear spider> 39kto which vthe rod 16 compresses spring 11 and causes rack 30
is fastened worm~ gear 40 and by nut 4'|,~1inner .69 to rotate pinions >68 and 66 which thread nuts
bearing races 34 and 36'and worm gear spider 61 on their respective studs 65 and 66 to tighten
39 are all clamped to spindle 26. The spindle A26 clamping plates 1| and13 to the tailstock sup
may be provided with any typeof work-pieceen
port I6. Adjustment nuts 14V allow any degree
gaging element such as acenter 26a.A
of clamping tension' to be obtained. When it is
30
Bushing 36 has screwed to its lower end a
desired -to- remove the. piece of work from the
, nut 42, byr which the position of bushing 36 may centers,- rod 1U is moved in an upward direction,
be regulated which, in turn, regulates the amount ' and the construction- just described allows the
of initial >thrust placed on the spindle anti-fric
rod 19 to'move longitudinally with respect tov
tion
40
bearings.
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Meshing with worm gear 40 is worm _46 keyed
to shaft 44 supported inbearings in the base l0
bodyA 56, whereby the rack 19 rotates pinions
66 and” in the reverse direction, thus releasing
the clamps, until 4collar 15 is brought up against
. -and which shaft has removably keyed to~one end f the Shoulder on cap 19 _thereupon
change gear 45 meshing with change gear 46
further
movement'of rod 16 in' an upward direction’will ¿5.
removably keyed to shaft~ 41, access to these ~
'45 changegears belng'had by means pf removable / mt mustœk body 55'
The rod 19', which operates the tailstock, has
` plate 48, (see Figs. 3 and 4) .
piston 6| ilxed to its upper end and slidable in
At the other endo: shari;
n is keyed
g'ea?
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\ '49,
c
nder 62 (see Fi
. -10, A11
v12 .
li
meshing with pinion 56 on the shaft of motor .5| , ¿nrecewes mud eitgtîér from :E: óuìsidgìolâgg;
50
and. through these spindle . 26 is driven by motor - or.. from
- through pipe 63 and 50
L
pipe , |42 (Fig. 10)
5|. Keyed to ,shaft »41 is sprocket 62,- which by -. valve “sings nu’ and the e l ¿ust from the cy1_
_ chain 53 and sprocket 54, drives tl‘íel lubricating «, inder is delivered throughpipe' 61 to a drain.
Pump 55-
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55~
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Taikmck construe@
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ma
g
Piston u
and through itl rod-1o and tail»
' stock vbody .56, are controlledv in movement by -
Slidably mginted in the tailstock support i6. » handv lever 99 which operates a-pilot valve 92a
iS a 'tailStOek bOdY 56 Which i5 bored'ßt 011e endv in a valve casing 62a on cylinder` 92 as follows: vAn
Y t0 hOld thelive tailßto‘ìk Center/"0. which' mßy " _extension 9| on hand leveigß is connected with
be carried
sleeve 51. rotatableJ inanti-friction
, in a .„
_
valve rod 92 'so that movement of the hand lever
bearings 56 and 59, but not free to move longi
reciprocates the valve rod 92 and the pilot valve 60
60 tudinallyl The sleeve`51 holds the tailstock center . 92a.. with _the valve “a in the upper position
60 or some other typeof work supporting means.
shown, fluid enters'fhev valve casing through pipev
63 and portl 99 and'passes „to portl 94 which is
6| and 62v and adjustable gibs 69 and“ 'andis' ' connected by port ¿95 with the ‘upper end oic' the
bored` to receive studs 65 and 66. .These studs cylinder. 62 and acts on ¿piston 6| to' torce it
'The tailstock body 66 isheld to base I6 -by straps
with their operating mechanism (see Figs. 5 and
lThe ñuid on the underside of piston'll
v6) are similar, thus 'only one will be described. f f‘down'.
is forced out through port 96a to port v96, where
Stud 65 is threaded -on one end for- engagement it’passes by the .valve to port-„91, and lifting pop- -‘
with a nut 61, which has- fast toit a pinion 6_6.
‘
This pinion meshes with andis operated by rack - Det Valve 96 Aagainst the Pl'gssure of adlustßble
70
spring'
99,
escapes
into
exhaust
port
61
through
70 _69 on operating rod 1|I.-_ 'I‘he other end of stud
65 .passes through a hole in clamping- plate 1|
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and is provided' with adjusting 'nuts 14 for the ` ~"When valve rod 92 is pulled 'down by means' of
portl
|6I.
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purpose of handadjustment. Clamping plate 1|, "hand lever l99, ñuid enters ‘through port 93.A
which clamps tailstock 5s to carriage Il', is free passes to port 9B and thence to the underside 0f
7.5 v.
75 to slide longitudinally withtailstock 66, but is piston 6| by means` of port 96a, the tluid on top
'arianna
of piston 8| being _displaced through ports 85,'
rlag'e, slide up and vdown in trombone |8I.l Aïd- ' l y
84, and passage _84a to exhaust pipe 81.
justably bolted to slide |05 is dog |82 which co
It will be noted that in the upward movement actsJwith finger |88 'on lever |84 'to cause partial
of piston 8|, the exhaust flows freely to pipe 81, _rotation of shaft or rod |85, which shaft con
whereas in its downward movement it is neces- - trols the change from fast ahead to feed ahead
sary for the exhaust to lift poppet valve 88. The in a wfa'y hereinafter described.
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It isœometimes' 'desirable to have the cutñng
reason for thisv is three-fold: First, ifv the fluid
were free to exhaust from the under side of the` tool |08 follow an angular or curved path;\.this is
piston when the pressure was shut off from the accomplished by moving slide |06î>either in or .
pipe 88 for any reason,`.the weight of the tail-l out at the same time that carriage 22 is moving io
. stock body-would cause the tailsiock and p’ston
upwards or downwards. ' For. that.'- purpo’se, se
to drop; spring ~8|! is therefore loaded sufficiently
to cause va1ve'88 to maintain a suilicient back
curely fastened to the carriage 22 .is housing |88
Third, it is desirable to havefmore force avail
IIlSV andfco-actizìg with cam |88 is follower block
|40.- At the beginning of a cycle slide |05 will be
.'(see Figs. 1, 'l and 8) ,' in which is slidably-mouhted `
pressure against spiston 8| to hold the tailstock cam bar |31 on which is formed cam |88. The
up when there is no'pressure in the line. 88,. Sec
upper end of cam bar |31 is’fastenedby rod |88a
ond, if therehwere no back pressure on the under .^ to feed plate I6. so that it is held stationary and; sideof the piston, immediately that pressure wail therefore, as carriage 22 moves either up or down,
applied to the top of the piston, the tailstock cam bar |31 and thus cam.v |88 is moved relatively
body would drop rapidly and out of control. to it.- Fastened to the rear or outer endl of slide
able to retract thevtailstock center than to ad-‘
vance it.. _ Due to the area of the` piston rod 10 _ 'pushed in by fluid pressure entering cylinder ||8 '
- there is in__ore working area on piston 8| .to push through pipe ||6 and acting against the outside
it down than to -.push it upf .I remedy this difli
of piston I|2 until cam follower I 4l touches cam '
25 culty,»by applying a back pressure to the bottom 488, Longitudinal movement of 'carriage 22 will
side' of piston 8| by_means of spring controlled now cause relative movement oi' cam |80 and fol
sure on the bottom of the piston when the pis
lower |40 and the ñuid pressure will cause fol
lower |40 and', therefore, _slide |05 to follow the
ton is being forced down.
contourof the cam. In order to avoid tool marks
_pôp‘p'et valve >98, so that there- is extra back pres-v
A
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TheI construction
Hydraulicofthe
slide construction
hydraulic carriage
` 'e and
on the work upon the return of the` tool, fluid
pressure is applied tothe inner side ofthe piston
||2_from pipe' |23 throughport _||8 before car‘
`slide are best shown onli‘lgs.- 7, 8 and 9, which » riage 2_2 starts on its'return movement, thus caus
show~the right hand carriage an’d slide of Fig.- 1. ing` the ‘slide |06 t be pulled away from# the work
and cam. follower 40'to be vpulled ‘away from the
vThe carriage or slides'base 22, as before ex
plained, has a cap 24 boltedvto it by bolts |02
'so thatl when .bolted together the two form a
Hydraulic slide-_operation and control
unitary base.
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This
is bored out
to hold ` bush-'
Hydraulic‘control of the >slides is illustrated in
cam
40
ings |08 and |04 which Yslidably fit o? bars- |I
and-J2, respectively.
. .Carriage 22 is provided’with ways |05 (Figs.
2 and '1) in which >is suda'bly mounted slide In
¿ñxed to which _is tool block |01 holding tool I I8,
|88.-.
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Figs. 10, 11 and 13: Fig. 13vbeing a diagrammatic
view o_f the piping, cylinders, and valves, most of
which are contained in one housing |4|, there
rbeing one housing` | 4| and associated parts for
or some such arrangement 'for cutting work. Se--. - each carriage unit as shown in Figs. 10 and 11.
45 curely fastened in slide |08 by stem |08 _and nut
I I0 is rod III, one lend oi- which forms piston
«I |2 which slides in cylinder ||8, which is a part
of carriage 22. One end of the cylinder is closed
Since the control andoperation of each carriage
unit is the same, only one will be described.
Pipe |42 leads from an accumulator, or source
of .fluid supply, frorri- _which .theï'iluidmay be `
` ‘by gland |l4, and the other end by cap ||5., drawn in varying volume _' but under constant
50 Fluid reaches the 'outer4 side of the piston Il! head, and is connected by pipes “2a-.with the
stop valve casing y|48 (Figs. 10 and'13) one in
Aeach housing I4|. A slidable stop valve _|44 is in
and |20, which are drilledin'carriage 22, pipe1A each 'valve casing |43 and each valve -|44 is con
- |2I, port- |22, which“ are in' cap, III, and p'pe trolled by a lever |45 (Figs. 1, 2, 10, 11 and 13),
|23, so that byapplying' pressure- on one'slde-or in such a way, that when the valve I 441s in the
the other of piston' ‘|22, the piston‘ may be moved position shown, fluid fromv Ythe source |42 isafre'e.
‘in the cylinder: and cause the slide |00 to traverse Yto Aflow through the valve ca’sing |48 and; when
either inward or; outward on guideways ||5 on moved to its other extreme position, the iiuidv
carriage 22.
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source is completely shutoilr from the hydraulic
60
Carriage' 22 is movable'vertically by push rod system; _ From> delivery port |48a -valve body |48
leads pipe |46 which lsupplies fluid pressure
|24, the lower end of which is threaded and se
curely but adjustably -held in carriage 22' by col,
through varigus instrumentalities to the carriage
lars` |25 and |26. The operation o'f rod |24 and. cylinder |50 and cross-slide cylinder ||8 to' ad
controljof the flow of iluid tothe cylinder ||8 is vance the carriage 22 .and/or slide |08 quickly‘ïto
through port |I8 and pipe ||1, and .reaches the
inner side of the piston through ports III, `-II8
65 lhereinafter described. “The slide |08 is stoppedl
at thefe?d of its inward movement by adjustable
stop screw |21, ,andn at the end of'its return
stroke by adjustablestop screw |28 _engaging with
the -work-piece inv idle movements and slowly for
work-performing or cutting opérations. From
the delivery A|48a of valve-_bodyl |48 leads a pipe
|41 which supplies iluid pressure to reverse of the
gland |'|4` (see Flg»..9), and carriage 22 is stopped _ cylinders |50 and ||8'.
4
70 at the end of its downward stroke _by adjustable
¿ -Frem pipe |41 leads' pipe m te the inner erv
`stop screw |28- (see Fig.` 1) onthe base'l0 and
reverse side of cross-slide cylinder |I8, and from
is limi’ed in its upward movement by adjustable ' it also leads pipev |48 connected to the lower end
l screw.|`30‘ on'tailstock support I8. As _carriage or reverse‘side of carriage operating cylinder |58.
22 vmoves up 'and down pipes ||1'and |28 which
are carried by the cylinder cap ||5 on said car-
T_hus, when valve- |44 is open, there is always full
pressure on the return side of Iboth the cross slide
¿1,118,022
4`
tain this pressure as longv as the ñuid is static.
and the carriage operating pistons ||2 and |81 -to
When, however, the» pistons startte move, thus
hold them in retracted position. ~ A branch pipe
allowing.the iiuid to flow, the pressure in the
pipes connected with the cylinders will be just
of which is >regulated by -a threaded bushing or> enough to overcome the resistance of the‘pistons
sleeve | 53a) which is connected by pipe |54 `to and', tool slides (the maximum of which is about
pipe |55 to the outer or forward side of cross-slide 500 to 600 pounds per square inch). Immediate
|5| leads from pipe |46 to metering valve |52
having a needle valve |53 (the amount of opening
cylinder ||3 by pipe ||1. Needle valve |53, when v ly that the tool slides are positively stopped, how- ,
ever, pressure will build up to the maximum un
10
less relieved.
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the 'machine is in operation, is constantlyre
volved by motor |51. This rotation of the needle
At the beginning of a cycle, the carriage 22 is at
its ~extreme upward position and the cross-slide
valve is a featureof my invention. as by this
means a very small opening can be maintained
|66 in its extreme outward position, away from
without the evil effects of wire drawing and stop
page due to minute particles of foreign‘matter in
the work, with pistons ||2 and.|61 in the posi
the fluid blocking up the port.v
tions shown in Fig. 13. Piston |59 of valve |58
is in its extreme leftehand position, as shown in
dotted lines, land'piston |64 of valve |63 is also in
its extreme left hand position. With the valves
l|56 and |64 in these positions, the fluid flows un
_.
The main pipe |46 from stop valve |46 leads
to valve-body |58 in which is a double valve |59
_ connected to and controlled by the rotatable shaft
|35^through lever |66 and link |6| (Figs. l, '1, 8,
der pressure through stop valve |43, pipe |41 20
`10, 11 and 13) and which valve controls the fast
and pipe |23 to the reverse side of piston ||2,
,and through pipes |41 and |49 tothe reverse
'fand slow feed and the reverse, in a manner here- '
inafter described. Leading from a mid-port |56
'in the` valve body |58 is pipel |62, connected with
valve body |63, having valve |64 therein‘operated
side of piston |61.
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As Valve piston |59 is in the extreme leftposi
tion covering port |46 further progress of the 25
25. in a manner hereinafter described and which
controls the operation vof the carriage 22. Pipe
|54 from the metering valve |52 has> à. branch
. | 55a connected tothe pipe |62 which connects
- fluid'under pressure in this direction is impos- .
sible. 'A certain vamount of ñuid proceeds
,through pipe |5| and valve |53 to pipe |54, thence
through pipes |55a, |62 to port |56'of valve |58,
said'port being positioned to be opened and closed 30
valves |59 and |63. -Also a branch pipe |61 con
nects regulator |66 with the pressure line between
the stop valve |43 and the cross-slide cylinder
| |34, preferably being connected to pipe |55. Issu
ing from valve body |63 is pipe |69 which con-'
nects with the feedv side |10 of thecarriage cyl
et, inder |56, and a3 branclr- |1|` from pipe |69 con
`nects with regulator |12, similarly as does pipe
by one portion of the valve plunger |59. As
valve plunger |59 is in the extreme left hand po
sition ñuid pressure passes from port |56 to port
, 2|5, thence through pipe |6I, foot valve |63 and
pipe |82- to drain |16.- In a similar way, the fluid 35
from'the outer side of piston | |2, escapes through
pipes ||1, |55, |55a, |62 and ports |56 and 2|5 to
pipe |6|,l foot valve |63, pipe |62 to drain |16.
|61 with regulator |66,/` g
These regulators- (or resistance valves, as they
The iluid from the advance or'upper side |16 of '
may be called) -|66 and |12 are responsive to iluid
pressure in the system to selectively direct said
ñ'uid pressure4 to actuate the piston valves |59
and |64 which control the movement 'and speed
'of carriages 22 and cross-slides |66. These regu
piston |61 flowsI through pipe |69 to ports 2|6 and
40
2|6 of valve |66 to pipe |64, foot valve |66 and
pipe |65, to drain pipe |16.
At the same time „
high pressure iluid from'pipe |41 is also passing
ietersfflss en |12 are identical ineenètruetion - from pipe |14 to port 265 of the regulator |66,
and have pilo valves |69 and |96, respectively, but as the pilot-valve |6‘9_,of said regulator is in
which control non-metered Vfluid pressure from_ , the position shown‘coveri'ng port 205, no further
pipe |41 through branches |14 and' |16,~ respec
movement of the fluid in this direction is pos
tively, and are each connected with a drain pipe
|16 through branch pipes |11. Pilot valve |69 of
regulator |66 is also connected with one _end of
sible. - In 'the same way, a portion of the high
pressure fluid flows from pipe |41 through pipe
|15 to port 2|4 of`regulator-|12 where it is simi
valve _|63 through pipe |16, while pilot valve |66
of regulator |12 is similarly connected with the~
larly- blocked by pilot valve |96 which is in the
position shown covering port 2| 4. Therefore,
other end of control valve |66 through pipe |19 ` high pressure is on" the reverse side of pistons H2
and is also connected with one ¿end of control and |61 and the advance sides of these pistons
,valvesl56 thro’ugh pipes |19 andbranchpipe |66, 5 V_are open to the drain'; thus both slides are held
the other end of control valve |66 being connected 'in their extreme retracted positions.
_A> cycle of operation'is started by the operator,
,to' hand lever |6| through link |6|.
_ _ A
One port of valve |66 is connected to drain' pipe
Y
who, by means of hand lever |9| I (in the direction
of the arrow shown'in Fig. 11) which is attached
to> control rod |65„operates -rod |6| and throws C()
valve plunger |56 into its _extreme right position
'- of twenty-five pounds', while one port of valve ' as shown by full lines in Fig. 13. The high pres
l, |63 is connected with drain pipe |16 by pipes |64 sure iiuid is now able to proceed from pipe |46
and |65 having foot-or-check valvev |66 interposed ‘ through port |46 of valve |56‘to port .|56, pipes
therein which is set to maintain a back pressure |62, |66a, |56and ||1 to the outer or forward side
l|16 by pipes`|6| and |62 „having foot or check
valve |66 interposed therein, which isset to
maintain in the machine shown, a back pressure
of- ñfty pounds, in the> machine shown.
‘
'l
'I"he cycle of hydraulic‘operations is as follows
' - (the operation er the rig-ht hand slide only being .
described) :'-
1o
,
In following through the cycle of operations
of this system, it is„to be remembered .that the
arrangement _is suclLthat ñuid is taken from an
(
accumulator of constant pressure (for example:
41100 pounds per square inch) and vthat all pipes
' which connect with the accumulator will ma‘in
|66 of cylinder ||6. The same pressure is now
~onboth sides of the vcross-slide operating piston `
|| 2, but due' to the diameter of the piston rod
||| the total pressure (or differential pressure)
is greater on the forward side of the piston and
the piston and rod~ move rapidly in thedirection
shown by the arrow, thus feeding the cross-slide
in rapidly. As thev cross-slide »approaches the
work, the adjustable dog |62, Figs. 1, 8 and 9, is
set so as to act on linger |66 of'lever |64 fast on
2,118,022
`
'
„
'
A
.
,
L
I
ras'
.
.
shaft 13's, thus rocking shaft" las to an extent
plunger |93 and spring |94l causes plunger _|93
. (opposite to that movement previously impartedv
to move back to its »original position as shown.,
to it'iby handle ISDîmoves plunger’ |59 into
in Fig. 13, this action also reseatingI valve |89
middle position so as to’cut oil port |48 and also
'in -the position shown§in~Fig. 13,
The same
[port 2I5, thus preventing further flow of high ` quick- snap of lever |91 takes place on this re
pressure fluid through _valve |58 to cylinder H3. .,seating, as on the original movement of the'
Nevertheless, a metered amount volf high pres
'I‘he play,lbetween the end of lever |91- and
sure Huid, flows _to the forward end |66 of cylin
collars |96 and 208- on plunger |93 is necessary`r
der> I |3 from a pipe |46 through pipe |5|, meter
because ifi there was no play, as pressure built ,10
10 ing valve |52, pipes |54, |55 and H1, the rate of
this ilow being determined by the‘amount which up in line |61 sufficient to overcome the pres
needle valve |53is opened by adjusting bushing sure of spring |94, plunger |93 would move, and
valve.
|53a, thus the piston ||2 continues to advance
slowly for cutting operations. During this oper
15 ation it is to be understood, as- explained above,
that the valve member |59 closes port |48, thuspreventirg constant pressure in large volume
from being transmitted to the cylinder ||3. , Dur-`
,»
y
.
`
`
by lever |91 move valve plunger |89 in the di-`
rection of the arrow. As soon as this valve.-
plunger had moved sufllciently to connect ports 15
205 and 206 fluid would immediately start to
ilow through pipe |18 to the end of valve |64,
moving it to the right. Immediately port 209
ing this slow advancing movement for cutting
was allowed' to communicate with port 2|0, pres
20 operations of the piston H2, the reverse sideof ~ sure in line |61 would drop and plunger |93 20
the piston ||2 is acting against constant pressure «wouldl'immediately be started back by spring |94,
being introduced at the‘reverse side of the cylin-v . thus moving valveipiunger |69 to close port 205. "
This operation might take place before the fluid
had a chance to move plunger |69 to its extreme
sure on the reverse side of the piston is less than right position, -and such action would be detri 25
mental. The extra play between the end of lever'
on. the forward feeding side- and the piston 'ad
-`|91 and the collars on plunger |99 and the »quick
When the cross slide |06 reaches the end of snap caused’by spring 209 to lever' |91~ after ity
4der I|3 through` pipes |41 and |23, but due `to
the area of the piston rod >i || the effective pres
-vances.
30
"
'
.
its stroke, it abuts against stop screw |21 ‘(Figs.
8, 9, 10) in carriage“ 2_2, which prevents further
forward movement. Pressure then immediately
begins to build up inV the high pressure line || 1,
|55, branch pipe |61 of regulating valve |68 and
tends to move ,valveplunger |93 against the re
.35
or delay to plunger |89 to allow the operations 30'
to be completely carriedout.
'
l
_
Since the valve |64 is in its extreme right hand
position, communicating >ports 299 and 2in and>
valve |59 is in «its mid position closing ports |49v
sistance of spring i 94 which is adjusted by _ and 2|5, metered fluid pressure «ilows from pipe 35
threaded bushing |95, to resist pressure of 1000 |54 through pipe |69` to continue the movement
pounds per square'inch. When pressure is high Vof carriage 22 downwardly until the carriage
l enough to overcome the resistance of this spring,
plunger |93Í is moved, and by shoulder |96 there
40 on, leverv |91 pivoted on pin |98,v starts to
move valve plunger |89 in the direction shown
by the arrow., This movement is relatively slow.
i45
has crossed the center,- provide a suillcient dwell '
until jaws |99 on lever/|91 get over the center,
when it is snapped quickly the rest of the way
by means of spring A200 on rod'20l pivoted on
pin 202. This quick movement is allowed by thel
extra space between lshoulders |96. and 203 on
' plunger |93. As piston |89 is slowly moved in
comes in _contact- with stop " screw |29 (Fig. 1)
when movement stops.
Since the ldownward
movement of the piston |91 has been arrested by 40
the stop |29, pressure on the upward or forward
side of the piston |81 builds up inthe high pres-sure line'now consisting of "pipes |69, |55a, | 55
and |61 connected with plunger |93 of regulator
kvalve |68, (the same as previously described in 45
connection with cylinder ||9 for the purpose of
moving plungerl|93 against the tension of spring
|94 set for 1000 pounds of pressure per square
the direction of the- arrow, port'A 204 which is linch), but as pipe |69 is also connected with
5,0 ñrst covered by piston |89, is not“ uncovered until plunger zii of reginato'r valve' arrbypipe m
the ,quick snap takes place and valve piston |89 this build-up pressure will ñrst actuate plunger, is thrown to its extreme position. When this 2|| against the tension of spring 2|2 set at a
occurs, port 205 is uncovered and put into com- ‘' lower pressure than spring |94, say for instance
900 pounds to the square inch. -. When the pres
munication with port 206 _and the high pressure4
iluid flows from pipes |41, |14 to pipe |18.to the
sure reaches 900 pounds per square inch‘plúnger
left hand end oi' valve |63 where it causes valve
Apiston |64 to move quickly to its extreme right
2 || starts to move, and throws pilot valve |90
by means of lever 2|3, (in the same way as that
55
- position, the fluid inv the chamber’l92 on »the . hereinbefore described-in connection withvalve .
right hand end of valve. piston |64 escaping
les) thus connecting port 2|_4 .with port'znr and
v through pipe |19, port 201 of regulating valve |12
‘_ allowing `the high pressure 'iluid from the live co
thence,- to port 208„wl1'ere itv drains into the f pressure line |41, to pass through pipe |15, ports.
body of valve |12, and from thence out »through " 2|4 and 201 and pipe |19 to the right, hand Íside ' s
fpipe |11 to the drain pipe | 16. Throwing> valve of `valve piston |64 throwing it to its extreme
plunger |64 tothe right puts portv 209'in com
left position, shown in the drawings, the »fluid
munication -with port 2|0 and allows/ the fluid'y from thel left hand ¿ide of valve >piston |64 es
to flow from metering valve |52 through pipes .caping through pipe |18, port 206, port 204 `_to
|54, |55a, |62, valve1 |63l through pipe |69 to the the interior ofvalve casing |68, fromwhence it;
advance side |10~of piston |81 causing it, by . escapes` to the drain through pipes ' |11 and |16.
means of the-beforementioned differential pres
At the same time~ this high pressure also passes
70 sure,.to feed thecarriage 22 slowly downward, .from regulating valve |12 through pipes |19Aand
the rate of,feed dependingas before, on the |80 to the right hand .end of vaive‘piston> |59,`
I .' amount of openin'gof needle valve |53. As soon throwing -it to its lextreme leftposition shown in
,as piston |81 starts t`o move downward, the pres
dotted lines. 'I'he advance side |66 of cross slide
sure in line` |61 accumulated bythe stopping ` cylinder H3 is now connectedwith the drain pipe
. of pistonv | I2, drops below 'that necessary to move
|16 through pipes |91, |55, |66a, |62, ports |56.
.79.1
l 6
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_
2,118,022
and :is to pipe isi, fooi; valve m and pipe In, ' member likewise operatively connected with the
and the advance side |16 of piston‘ |61‘is now piston of. another hydraulic cylinder, -and in
connected with the drain |16 through pipe |68, which thefluid connectionimeans extends be- .
' port 2i0, port, 2|6, pipe |84, foot valve |86 and twèensaid valve means and both of said cylinders
and means for automatically controlling the flow
pressure on the reverse side of pistons Il! and of said ~fluid through said connections for obtain
> |81 from the live pressure line |41 they tend to ing a sequential operation, of said members.
be pushed back. Foot valve |86 isset to resist ' , 4. In a ñuid pressure mechanism for machine
vtools as set. forth in claim l wherein said valve
a) higher pressure than foot valve- |68. For ex
means includes means for relieving the said pres:
10 ' ample, |86 may be set atvflfty pounds per square
inch and |83 at twenty-live pounds per square sures on said pressure-receiving element and
pipe |85; and as‘there is always present high
inch. Therefore, due to the peculiarities of now - wherein th’ere is fluid passage means supplying a
of liquid from. an accumulator, the extra. back Aconstant pressure to the pressure-receiving ele#
pressure on valve |86 will keep' piston |81 from' ment to move and retain said member in a ‘re
starting .its reverse movement until piston Il! ,'tracted position and to yieldingly resist the move 15
ment of the 'member in` the other giirection.
-has reached its extreme outer or retracted posi
5. A iluid pressure mechanism lfor operating a
tion. Then piston |81'will start baci:l until it
reaches its extreme retracted or upper position. > vsingle moving member, or a plurality of moving
L As soon as valve plunger |64 has been shifted niiemberscomprising a constant pressure source
of iluid supply; member moving means whereby 20
to its extreme left position, as hereinbefore men
pressure maybe exerted on such lmeans to ad
tioned,` the pressure in line |66 will drop as here
A
vance or retract a member, aforesaid; ‘a constant-_
inbefore mentioned and plunger 2li and'pilot
valve |90 of regulator |12 will be reset by spring
2|2_ in the same manner in which valve lll ofr
regulator |68 was reset.
25
ly open connection between the constant pressure
source of iluid supply andthe retraction side of `
Athe member-moving means; means forconnect D25
` .
.'I‘he pistons and valves and slides are no_w in
ing _the advance side of the member-moving
their original position, ready to Xstart. another'
means_with either a drain line, a source- of iiuid
under ,constant pressure in ilarg'e volume, or a
‘ source of vfluid under constant pressure in small
Avolume: means for metering the constant pres
sure fluid supply, means for, producing back pres
sure in the drain line, and a quick-acting means
cycle upon operation of plunger' valve |68 by handlever ISI.
i
If, at any time, it is desired stop or start the.
30
» machine' during a cycle, that can be done through
stop valve |44 by means of-hand lever |46 (Figs. l,
10, 1-1 and 13). In the cycle'of operation, yas
above described, the valvel piston |66 is shifted
operated by variation in pressure to ‘automatically
change the huid ilow.
Y
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6.` Inl a fluid pressure mechanism lfor‘maéhine 35
tools'ha'ving a fluid metering needle valve, and'
from the fast ahead position shown in full lines e
of Fig. 13, to the slow feed ahead position (a mid
means to rotate said valve while the mechanism
die position of thevalve to close ports |48 and
is in operation.
1, In a ñuid pressure mechanism for machine->
slide |06,A but it is evident that the throwing ot
tools
that have to and fro. moving members, a .4.0
position
may
be
dethis
valve
into
the
slow
f
40
_fer'red until any pointi A. the forward cycle of quick laction valve> that' _controls the fluid pres- ì
veither the cross slide or the carriage. or it may sure acting on such a member, automatic means
not-be shifted to the feed position at all. in which to operate said valve comprising- a fluid pressure
2li) during the forward movement of the- cross
„ case the complete 4cycle will take place on the fast .
moved;_,plunger,- means yieldingly opposingmove
V«its like counter-part) may be actuated `before the`
slide |06 in the beginningA ofthe machine oper'
said valve acting by movement of the plunger
under‘lfiluid pressure lin excessof the yieldable
`lment ¿if said plunger by ñuid pressure,'and an.
~45 motì'on. It is also lcontemplated and within the operatlvepconnectio'n between the plunger an’d
>purview of this inventioxrthat the)carrlage 22 (or
ating cycle.
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50
.
That which is claimed is:
,
l
ì
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,
movement opposing means.
l
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50
tool thatv hasa plurality of to Àand fro moving
1». In a'fluid `pressure mechanism for machine'
tools having a movable member whose rate of
_slides,ïa hydraulic cylinder and piston operatively
connected with each slide, a source of supply of >
movement in one direction is to be changed, a
ñuid pressure, piping leading from s_uch source to
source ofY constant fluid pressure to effect all suchv
55 rates of movements, a pressure receiving element .
connected with said movable member, means for
establishing fluid pressure connection between
f
v :8. A Vñuid‘pressure mechanism for a machine
.
each of
said, cylinders, a valve in such piping for
_
' >controlling -ñuid pressure delivered to said .cylin
ders, a _second valve means in said piping adapted
said pressure source and the fluid pressure receiv~ „ to causeiast andslow movements to the slides .ing element, a valve means in said connection- and tareverse the direction thereof, a resistance 60
,in said piping for each hydraulic cylinder
60 means for changing the rate oi.' movement of the - valve
movable member and including a valve element and subject to pressure supplied to the respective
for varying the amount of fluid delivered to the cylinders, and means to prevent action of each
fluid
pressure receiving .element from said supply such resistance valve until a predetermined
.
‘ source, and a second valve element for controlling vpressure is applied thereto.
Í9. In a machine-tool havingmovable carriage, 65.
the delivery of larger volume to said pressure re
ceiying element from said source whereby the rate I a rslide on said carriage having a follower block,
a. housing on'said carriage, a former cam; a bar
of movement of saidniember may be changed.
_2. In a ñuld pressure mechanism'as in_claim 1 ï carrying the cam and slidable in said housing, hy
said valve means including means for relieving draulic means for Vplacing the slide'follower block 70
the pressures on said pressure receiving element, îin contact with the foromer cam holding it there
and rmeans .for _moving saidvmember in reverse and retracting it; andvmeans for imparting rela#
’
direction when said pressures are relievedif, ,
3. In a mechanism asin claim l in which the
pressure receiving element isthe piston of a hy
75 draulic cylinder and there is a second movable
tive movement to slide and former cam.
10. A - machine-tool comprising two
.
spaced
apart units, a lower unit constituting an upright
base, means mounted 'on suchbase for imparting -
7 ,
2,118,022
.
5
the same and including a rotatable rod,
rotation tothe work' and including a vertical .release
said member moving means' having a yielding
spindle; the other unit being an upper unit sup
said member so that
connection . with
'
porting tool-feed mechanism and including a> slidable
when the member is arrested in its movement to
horizontal bottom `feed-»works supporting plate, a lengage the work-piece ~said moving means will
plurality of vertical bars rigidly supported at their have a further continued movement, and an cp
lower ends in _the 'lowenunit and extending up
erative connection between said moving means
.fil
ward to the underside oi said plate and vrigidly and said rotatableA rod,rl whereby the clamping
connected tosaid plate,- tool slides mounted to‘ lelement will be actuated after said«member has
reciprocate on said bars, and>r operative connec
10 tions between the -feed-works above -said plate and
y ,A said slidesreaching downward from said plate.
been brought to rest in its engagement with the
_ work-piece and will be again actuated> when the .
moving means is initially operated to withdraw
ll. A >macliine=tcol comprising two spaced
apart units, a lower unit constituting anupright
said member from the work-piece, but before _
said member is actually moved,
base,~' means mounted on the base for imparting
1'6. In a machine-tool, a plurality of members .
rotation to the work and including a vertical v adapted to cooperate with respect to a work-piece,
l spindle; the other unit being an upper unit sup- è
porting tool feed mechanism and including a hori
vzontal bottom feed work supporting plate,- a~
in the machine, means for moving one of said
; .members vertically to and from the work-piece, -
said member having a work engaging part, a sup
plurality of `vertical bars rigidly supported at port forl said member with respect to which'it
20
20' their lower ends in the lower unitand extending
moves, a clamping element positioned to vengage
plate,4 said. operative connections comprising
membersV of >hydraulic mechanism situated-above
slídable 'connection with said member so that
upward to the underside of said plate and rigidly and bind against said support, means connecting
connected to said plate, tool slides mounted to _said clamping »element- and said member and op
reciprocate on said bars, 'and operative connec
to bind said element against said support
tions between* the feed works above said plate era‘ble
and to release the same and including a rotatable 25
25 and said slides preaching downward from said rod, said member moving means having-a loose
said plate.
»-
"‘
,
y
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‘12. In a machineß-tool, a plurality of members'
when the member is arrested _in its downward
movement by engagement with the work-pieceA
said moving means will have a further downward 30
30 adapted to cooperate with respect Vto a work piece
movement, and an operative connection between
in the machine, means for moving one of said ' said moving means and sai’d rotatable rod, where
members tol and from thework piece, means for
locking said member vin one of its vmovements
and comprising a clamp ymeans, said member
35 moving means having a loose connection with _
_ said member whereby said 'member moving means
may continue movement after the-movement of
said member has been arrested in one direction
and will iirst move in the opposite direction be
40 fore correspondingly. m ving said member, said
member movingmeans avingan operable con
bythe clamping element will be actuated after
said member has been brought to rest in its down-_ -
ward movement and will be again actuated when 35
the moving means' initially operated to raise said
member. `but vbefore said member is actually
moved.,-
v-
`~
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,
17.1n a fluidfpressure mechanism for a ma
chine-tool which has a _to and fro moving -mem
ber; a hydraulic-cylinder anda pistontherein
operatively connected with said member for mov-y
nection with said clamping means to” operate the _ ing the latter, in two directions, a source oi con->
same Ior clampir?g said member when it has been stant pressure `supply _having a constantly open
arrested in its movement _in -one direction and connection with said 'cylinder for moving said
for
.releasing said'clamping meansïwhén initially piston into and maintaining the same in a posi'
45
moved in the opposite direction.
i
tion to retract said member, another connection
i3. In a machine-tool' asset iorth'in claim l1 » between said source Vof supply‘and said cylinder
further characterized by said member moving». to- operate said piston> to feed the member for
means including a fluid pressureactuating def
- _
wardly, means in said second connection for con
50
50 Avice for operating- said moving means in opposite ' trolling the ilow of fluid pressure to said cylinder
directions, and means for gradually releasing
at the memberadvancing side of said piston,
and
`
` back pressure in said devic e in the movement of ` _. means in said second connection and responsive
said' member toward the workpiece in the ma
‘to back Ipressure for actuating said first men
means to relieve the pressure on the ad
14. 1n a’macmnecool' as setrorni incmlm i1 _' - tioned
Vance sideof said piston, whereby the pressure on
further characterized b_y saidmemben moving the retraction side (of said -piston will operate '
means including a fluid pressure actuating device`
same.
for operating _said moving means in-opposite «ii-»_ fthe
_
essure mechanism for a ma-rections. means supplying fluid pressure to said Í >chine-tool which has a to and fro moving mem 60
fluid pressure actuating- device and normally ber, a hydraulic cylinder and a piston therein
chine.
.
60
'
maintaining said pressure thereto from moving. operatively connected with said member for mov
said member away from the .work-piece, and ing the latter in twó directions, a source of con
means for'gradually rele'asingrback. pressure in ' stant
A pressure supply having a. constantly open>
'
65
said device -in the'movement _of >said member connection with said cylinder çtor moving said pis
toward the work piece in them'achine.
into and maintaining the ’same in a position
15. In a machine-tool, >a plurality oi!> members .ton
to retract said member, another connection be
adapted to cooperate with respect to a‘work piece tween said source -ofïsupply and said cylinder
in the machine, means for moving one _of vsaidl to operate said piston to ,feed 'the member for- _
members to- and from the‘work-piece, said mem- _
having `a` work engaging part, a support .for
wardly, _ said second connection including . means 70
controlling and varying the fluid pressure de
said memberv with respectI to which it moves, a 'ï for
livered
to the advance side l_of said piston whereby
clampingelement positioned- tol engage vand bind ‘the rate
of advanced movement of said pistonl against said support, means connecting said
may
be
varied,
andmeans in said second_con
clamping element and said member and operable nection and responsive
to back pressure for actu 75
'to bind said element against said support
and to
i
8
2,119,022
ating said' iirst mentioned means to relieve the
pressure on- the advance - side of said piston,
whereby the pressure on‘the retraction side of
_said piston will operate the same.
' 19. In a fluid pressure mechanism for a ma
chine-tool which has two to and fro moving mein
bers; ‘twohydraulic cylinders and pistons, one for
each of said members to operate the same; a
source of constant pressure, supply having a con
10 nection with the cylinders at the retraction side
. of each of` said pistons for moving said pistons
_into and maintaining the same in positions to
'
\ j
pressure supply source andthe retraction side of
said member moving means, means'for connect-4 '
ingthev advance side ot said member moving
means> with said pressure supply source`and to
a drain, and valve means in said last mentioned4
connecting means for controlling the pressure
therein to said member moving means, and means
in said advance side connection and by-passing
said valve means tor metering the constant pres- `
sure supplyn from said source to the advance side
of said member moving means.
»
l
22. In a fluid pressure mechanism as set forth
retract said members, another connection between ~» in claim 21 further characterized by means for »
said source of supply and said cylinders at the producing a back pressure in said advance side
advance side of their respective pistons, a valve connecting means, and a pressure device respon
15
means in said second connection operable ‘to de
sive to~ variations in the pressure in said advance
liver suflicient pressure to one of said pistons to side connecting means_fo'r automatically relieving
advance the latter fromv its retracted position, the pressure therein when predetermined pres
means- responsive to back pressure in the advance sure has been reached. ‘ `
pressure line of said last mentioned piston to op Í, v23. In a ñuid pressure mechanism asset forth
erate said valve means for 'admitting pressure to in claim 21 further characterized by a second to
the advance side of the other of said pistons, and and fro movable member andv means for operat
another means responsive to pressure in‘xthe ad
ing said member, an open connection between'the
vancevpressure line of said'other piston for op
said source of duid pressure and said last men
erating said valve means to cut off the. advanc
tioned`member
moving means for retracting said
ing' pressure to each of said cylinders whereby second member; another- connection between said -25
the constant pressure .at the retraction sides of last mentioned member moving means, the outlet
said pistons will become veiïective for retracting side‘of said ?r'st" mentioned valve means and the
the same.
-,
I Y
-30
20. In a iiuid pressure mechanism for a ma
chine-tool as set forth in claim 19, further char
acterized by other pressure responsive means in
said connections responsive to the said back pres
sure in said advance side of said cylinders for
allowing one of said pistons to be retracted be
fore the other of said pistons.
Y '
21. In a fluid pressure mechanism for operat
ing a moving member or a plurality of moving
outlet side of said metered pressure connection
foradvancing said second> member, anda second 30
valve means in the Ladvance side connection of -
said last mentioned member movingmeans for
opening and closing the same, means in .the ad- '
Vance side connections and respgnsive to pres
sure therein from the member moving means, a 35
connection between said pressure _responsive
means and said second valve means to effect the
advancing operation bf said second member, and
vmembers of a machine tool,` which mechanism ‘ a connection between` said pressure responsive
40 comprises a source of constant pressure fluid sup- .
means and bothâof seid valve means for render
ply, means for moving said member by said iiuid ing the pressure- in said member advancing con-_ 40
pressure to advance said member or retract thev nections ineffective. _
y
same, a constantly open connection between said '
MYRON s.- CURTIS,
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