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Патент USA US2379037

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June 26, 1945.
O_ E_ ROSEN
‘2,379,037
HYDRAULIC TRACER
Filed May 13, 1943
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June 26, 1945.
O_ E_ RQSEN
2,379,037
HYDRAUL I C TRACER
Filed May 13, 1943
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2 Sheets-Sheet 2
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IN VEN TOR.
2,379,037
Patented June 26,1945
" UNITED STATES PATENT OFFICE
2,379,037
HYDRAULIC Tuscan '
Oscar E. Rosen, Detroit, ch.
Application May 13,1943, Serial/No. 486,842
5 Claims. (Cl. 90-62)
The present invention relates to hydraulic
tracers for duplicating machines and speci?cally
to a tracer active to control the movement of the
back to the tank T. Variation of the bleeding of
the ?uid from the line BI will cause the vertical
slide, carrying the tracer and cutter, to move up
or down, the "down” movement being caused by
‘gravity and excess bleeding while the “up" move
ment is caused by restricting the bleeding. Con
trol of such bleeding is accomplished by the tracer
D in conjunction with the pattern A as the latter
is moved horizontally.
machine in one direction.
In certain types of cutting machines, e. g.,
wherein the movable slide carrying the cutter is
quite heavily constructed, movement of the cutter
carrying slide toward the work is through the‘ ac
tion of gravity while its movement away from the
work is accomplished by the use of hydraulic pres 10
sure. Usually such hydraulic pressure means is so
arranged that looking the hydraulic ?uid againstv
movement results in locking the slide against
movement.
.
The present invention has among its objects
a hydraulic tracer applicable to such machines
to convert them into highly satisfactory dupli
cating machines for the reproduction of patterns,
models, etc.
Another object is a simply constructed tracer
which controls the relative movement of the cut
ter and work e?lciently and with a high degree
of accuracy, but contains a minimum of moving
A suitable tracer for such a machine is‘ shown
in the sectional view in Figure 3. In this ?gure
\there is shown a suitable casing I0 provided on
one side with a dovetail portion I I slidable verti
cally in the grooved slide member I2 and adjust
15 able through the use of the screw [3.
The casing I0 is bored longitudinally to pro
vide an oil chamber I5 and covered by means of a
suitable cover I6 through which may be provided
the oil inlet I‘I. Within the casing and around
the inlet H is a valve seat member I8 and a suit
able oil outlet I9 is indicated as leading from
the chamber I5.
,
‘
Within chamber I5 and of somewhat smaller
parts.
diameter than the chamber is a valve structure
Other objects and advantages will be apparent 25 which consists oi’ an upper and lower portions 20
to those skilled in the art upon reference to the
and 2I respectively, these being in axial align
following description and the ‘ accompanying
ment and the upper portion preferably being pro
drawings in which
vided with a restricted lower end 22 nesting in the
Figure 1 is a diagrammatic view indicating the
lower portion 2 I . The upper portion 20 serves as a
30 guide member for a valve 25 adapted to cooperate
use of the tracer with a milling machine.
Figure 2 is a similar view simplified.
with the valve seat I8 pressed upwardly against
Figure 3 is a vertical section of the tracer on
the seat by means of a suitable spring 26. This
the line 3-8 of Figure 4, and
'
spring acts against a perforated plate 21 which is
Figure 4 is a bottom view of the tracer.
itself seated on a suitable shoulder provided by
Figure 5 is an enlarged view of a portion of 35 the restricted lower portion 22.
Fig. 3.
Within the lower portion 2I of the valve struc
~’ In the drawings there is indicated in Figure 1
ture is a cylindrical guide member 30 for a second
one of the uses of the tracer with a milling ma
valve 3! movable longitudinally of the valve struc
chine indicated as a whole by M. This is pro
ture to cooperate with the lower restricted por
vided with a horizontally movable slide L upon 40 tion 22 which acts as a valve seat for the valve
which is mounted a pattern K and workpiece J.
3|. A suitable spring 32 acts between the second
The machine M is also provided with an upright
valve 3! and the plate 21 above mentioned.
portion carrying a vertically movable slide I upon
The valve 3| is provided with a stem 35 which
which is ?xed an arm H carrying the tracer D.
extends from the lower end of the guide member
45
The vertical slide also of course carries the cut
30 where its ?attened or slightly rounded end
ting tool N, the relative positions oi’ the tool N
contacts with the upper surface or a block 36
and tracer 1) being the same as the relative posi
upon which is mounted a tracer point 31. This
tions of the work J and the pattern K.
block 36 is slidable between cooperating guide
Fixed to the vertical slide in such manner as
portions 38 secured to the outside of the casing
to produce vertical motion of the slide is a pres 50 III while the block and guide 38 are of such di
sure cylinder and piston A, ?uid under pressure
mensions as to permit a small amount of vertical
being supplied thereto from tank T through con
or tilting movement of the block.
duits F and BI from a pump B driven by a motor I
The spring 28 and the valve 25 are preferably
C, while a controlled proportion 01 the ?uid is‘
so adjusted that there will be permitted through
bled from the line BI through the tracer D and 65 the tracer a suiilcient ?ow of oil to cause the
2
2,379,037
tool carrying slide to move upward slowly. In
order, however, to maintain the slide at a proper
level, a further flow of fluid is permitted through
the tracer by a restricted passage through the
and thereby reduces or stops the ?ow past valve
25 and causes rapid upward movement 01' the
piston in A.
valve 25 itself.
In the construction shown, a tapped hole 40 is
claim is:
1. Hydraulic tracer mechanism consisting of a
formed in the head of valve 25 and in this a
small bushing is secured, the bushing having an
Having now disclosed the invention, what I
casing having means for mounting on a suitable
support and having ?uid inlet and outlet means,
a spring pressed valve normally closing said in
opening of suitable size. This allows a restricted
?ow of ?uid through the valve 25 into the cham 10 let, said valve when open allowing ?ow directly
from said inlet to said outlet, a bleed passage
ber within the valve 25, which chamber com
leading from said inlet to said outlet, 9. second
municates with that formed by extending the
valve controlling said bleed passage, a movable
guide 20 for a short distance below the end of
tracer ?nger connected to said second valve and
valve 25. This chamber is provided with an out
adapted to move said valve to thereby vary the
let 4| below the end of the extension and the
capacity of said bleed passage.
valve seat 22 so that movement of the valve ill
2. Hydraulic tracer mechanism consisting of a
will vary the ?ow of ?uid through the openings
casing having inlet and outlet means for ?uid,
40 and 4!.
means in said casing de?ning two passages from
Further in order to make the movement of
valve 3i sensitive to slight pressure upon the - said inlet to said outlet, 9. spring actuated valve
for controlling one of said passages. means pro
tracer ?nger 3?, it is provided with a small re
viding a predetermined restricted ?ow through
stricted passage 45 leading from above the valve
the other of said passages, a tracer ?nger, and
to the guide cylinder 30 below the valve and in
a second valve operable by said ?nger for vary
order that the pressure balance may be accurate,
the valve 3| is stepped on its outer periphery so - ing the ?uid ?ow through said other passage.
3. Hydraulic tracer mechanism consisting of a
that the area exposed to ?uid pressure above
casing having inlet and outlet means for ?uid.
is equal to the area exposed to ?uid pressure be
means in said casing de?ning two passages from
low said valve, that is, the diameter of the un
said inlet to said outlet, a spring actuated valve
derside of valve 3| is enough greater than the
for controlling one of said passages, means pro
diameter of the upper side to compensate for the
viding a predetermined restricted flow through
cross sectional area of stem 35.
the other of said passages, a tracer ?nger, a sec
The passage 50 leads from the chamber IE to
ond valve operable by said ?nger for varying the
the guide for stem 35 whereby to lubricate the
?uid ?ow through said other passage, and means
latter.
for balancing the pressure on both sides of said
In the operation of the tracer, assuming that
second valve.
.
the tracer ?nger 31 is not touching the pattern,
4. Hydraulic tracer mechanism consisting of a
the valve 3| is in its lowest position and there
casing having inlet and outlet means for ?uid,
fore fully open. Further, in such case, the valve
means in said casing de?ning two passages from
25 will also be open and ?uid from pump B will
said inlet to said outlet, a spring actuated valve
pass between the latter and its seat and also
for controlling one of said passages, means pro
through openings 40 and 4|. Under these con
viding a predetermined restricted ?ow through
ditions the back pressure in line Bi and there
the other of said passages, and a piston valve
fore under piston will be insui?cient to support
having a stem arranged in operative relation with
the tool slide and tracer. These latter will there
fore descend slowly until they touch the work a‘ said tracer ?nger and movable thereby to vary
the ?uid ?ow through said other passage.
and pattern‘ respectively.
5. Hydraulic tracer mechanism consisting of
Such contact will move the tracer ?nger and
a casing having inlet and outlet means for ?uid,
with it the valve 3| upwardly, thereby restrict
means in said casing de?ning two passages from
ing the ?ow through openings 40 and M. This
causes the back pressure to build up in Bi and =. said inlet to said outlet, a spring actuated valve
for controlling one of said passages, means pro
under piston A and stops the downward move
viding a predetermined restricted ?ow through
. ment of the tool slide and tracer.
the other of said passages, and a piston valve
Only a small movement of the valve 3| is re
having a stem arranged in operative relation
quired to produce a balanced condition wherein
with said tracer ?nger and movable thereby to
the tool slide and tracer move neither up or .
vary the ?uid ?ow through said other passage,
down. Additional pressure, however, on the ?n
said piston valve being provided with means for
ger 31 not only further restricts the ?ow through
balancing the ?uid pressure on both sides thereof.
passage 40 but through the action of spring 32
OSCAR E. ROSEN.
moves the valve 25 ?rmly against the seat It
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