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Oct. 29, 1946.
'
’
A.~ B. NESBITT ET AL
'
SEVERING
I ' 2,410,355
TOOL
"
Filed Jan. 29, 1945
‘
‘
2 Sheets-Sheet I
W
"F1551- ‘
Z
’
I
Oct. 29, 1946?“
A. B. NESB'ITT ET AL
'
SEVERING
2,410,355 ’
TOOL
2 Sheets-Sheet 2
Filed Jan. 29, 1945
R.
£5
mm%W 5.”
m4
.
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.
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‘2,410,355
Patented Oct. 29, 1946
'- ' UNITED ‘STATES PATENT OFFICE. f
SEVEBING TOOL
Andrew B. Nesbitt and Samuel Webb, Pittsburgh,
Pa., assignors to National Tube Company, a V
corporation of New Jersey
Application January 29, 1945, Serial No. 575,104
5 Claims.
1
This invention relates to improvements in
severing tools for cutting o? crop ends from bar
or pipe stock or for cutting such stock into short
lengths and, more particularly, the invention re
lates to an improved manner of operating the
cutter head carrying the severing tools.
It is an object of the present invention to‘ pro
vide a severing tool which is substantially auto
matic and at the same time which is rapid and
e?icient in operation.
The foregoing and further objects will be ap
parent from the speci?cation and drawings,
wherein:
.
(01. 164-36)
22' held thereby tomove radially toward or ‘away
from the axis or center of the face plate Ill.
,
The cam plate 16 has a gear segment 34 on
the upper side thereof which is in engagement
with a rack 36. The rack 36 is mounted on the
lower side of a horizontally disposed plunger'38,
having shoulders 40 thereon, which is actuated
by two single acting hydraulic cylinders 42 and
44.
Stroke of the plunger 38 is limited and con
10 trolled by shoulders 40 engaging the inner ends
of cylinders 42 and 44.
.‘
V
A cam 46 is mounted-on the upper side of the
plunger 38 and a follower 48 on the lower end of
a reciprocating valve plunger 50 in a valve B is
Figure 1 is a plan view, partially in section;
Figure 2 is a. front elevation, partially in sec~ 15 spring-biased into engagement therewith. The
tion; and
’ function of the valve B will be described here
inafter.
_
Figure 3 is a cross-section on line IlI-III of
The rear’ end of cylinder 42 is connected di:
Figure 2.
rectly to a 4-way valve A by a line 54. The rear
Referring more particularly to the drawings,
the numeral 2 designates a conventional form of 20 end of cylinder 44 is connected to the opposite
side of the valve A by line 56 having a shunt 58
motor-driven rotatable spindle having a clutch
therein. A ?uid metering or control valve 0
controlled cam-operated chuck 4 adapted to grip
having a dial setting gauge 60 is disposed in line
a workpiece such as a length of pipe indicated
56 and the aforementioned valve B is contained
by the letter W. Since the work-rotating spin
in
the shunt 58. Valve B is provided with a check
dle and chuck are of conventional form, they
valve which permits ?uid to pass freely ‘there-i
will not be further illustrated or described.
through in a left to right direction. 'A pump
A longitudinally extending supporting frame 6.
(not shown) is connected to the foregoing hy-‘
is anchored to a suitable foundation and carries
draulic
circuit through the 4-way valve A. Fluid
ways 8. A face plate l6 having an opening‘ 9
.therethrough is mounted on the ways by a sup 30 pressure from the pump may thus be admitted
selectively to line 54 or 56 and shunt 58 to move
port l2. The face plate ID has a central rear
wardly extending bearing portion 14 on'which
the plunger 38 as desired.
‘
'
The control valve C is composed of a constant
pressure valve and a variable opening valve, the
ably mounted on the face plate H] on holders H 35 setting of which is registered on the dial 60.
there is rotatively mounted between the face
plate 10 and support l2, a cam plate It. Slid
in slideways l8, are three unevenly spaced cut
ters 20, a similarly mounted chamfering tool 22
and pivotally mounted reaming tool ‘24. The
reaming tool 24 is ‘adapted to be hand operated
'
In operation with a workpiece disposed in po
' sition to be cut, valve A is operated to admit fluid
under pressure to line 54 to move, plunger‘ 38 .to
the right as shown in Figure 2 of the drawings.
and pulled into working position by a handle 26 I 40 Fluid is ‘exhausted from the cylinder 44 through
shunt 58 and valve B allowing rapid movement of
from a normal outwardly extending position to
the plunger until the cutting tools 25 closely‘ ap
which it is yieldingly urged by a spring 28.
4
proach the workpiece by reason of the rack 36
The cutters 20 and chamfering tool 22 are posi
rotating the cam Wheel 16. By reason of this
tioned in their respective slideways l8 by pins 45 movement, the cam 46 also moves to the right lift
30 extending outwardly from both sides of the
ing the follower 48 and plunger 50 to closethe
face plate Ill so that one end rigidly engages tool
valve B as the cutting tools approach the work
holders H and the other slidably engages slots . piece. Thereafter the ?uid exhausting from cyl
inder 44 must pass through the control valve C
32 in cam plate Hi. The slots 32, which are dis
posed rearwardly of the tool holders H, are arcu 50 which is set to control the passage of ?uid there
through to the rate which will permit the plunger
ately shaped and have a spiral-like or eccentric
38 to move at the speed which will move the cut‘
disposition so that one end is nearer the, axisof
ting tools into the workpiece at-the desired rate.
the cam plate than the other end. Accordingly,
After the tools 20 have passed completely through
it is seen that rotation of the cam plate I6 will
cause the tool holders I1 and the tools 20 and 5.5 the workpiece and the tool ZZhas'chamIferedthe
2,410,355
.
.
3
4
edge thereof, the reaming tool 24 is brought into
engagement with the end of the workpiece to
ream the inside edge thereof. Thereafter the
valve A is operated to reverse the ?ow or the ?uid
whereby ?uid is passed through the check valve
of valve B into the outer end of cylinder 44 and
is exhausted from the outer end of cylinder 42 to
rotate the cam plate‘ I6 to open the tools 2?] and
22 to their widest position so that the workpiece
W may be repositioned or another workpiece may
be positioned therein.
'
stock on its longitudinal axis, a tool support hav
ing an opening therethrough adapted to encom
pass said stock while held by said rotating means,
a plurality of cutting tools slidably mounted on
said support for movement transversely and radi
ally of the longitudinal axis of said stock, a ro
tatable cam plate for moving said cutting tools
transversely and radially of said stock, means to
rotate said cam plate, said means comprising a
10
While we have shown and described one speci?c
embodiment of our invention. it will be under
gear segment on said rotatable cam plate, a rack
engaging said gear segment, a pair of opposed
hydraulic cylinders for reciprocating said rack,
means for. admitting ?uid under pressure to one
stood that this embodiment is .merely for the pur- ‘ " of‘said cylinders to move said tools inwardly of
pose of illustration and description and that vari'; ,
‘said stock, means controlling the rate of exhaust
one other forms may be devised within the scope
of our invention, as defined in the appended
claims.
We claim:
of fluid from the other of said cylinders, said
‘means-comprising a variable control valve and a
shunt, a shut-off valve in said shunt and means
responsive to the movement of said rack to close
a
1. A machine tool for severing elongated baror
said shut-01f valve whereby said tools may be
pipe stock, comprising means for rotating the 20 moved rapidlyinwardly until they'approach said
stock on its longitudinal axis, a tool support hav
stock and are thereafter moved inwardly at a
ing an opening therethrough adapted to encom
slower and controlled rate‘.
pass said stock while held by‘ 'said rotating means,
4. A machine tool for severing elongated bar
a plurality of cutting tools slidably mounted on 25 or pipe stock, comprising means for rotating the
said support for movement transversely and radi
stock, on its longitudinal axis, a tool support hav
ally of’ the longitudinal axis of said stock, rotat
ing an opening‘ therethrough adapted to encom
able cam means for moving said cutting tools
pass said stock while held‘by said rotating means,
transversely and radially of said stock, means to
a plurality of cutting tools slidably mounted on
rotate ‘said cam means, said means comprising at
said support for movement transversely and radi
least an hydraulic cylinder, means for admitting
ally of the longitudinal axis of said stock, rotat
?uid under pressure thereto to rotate said cam
able cam means for moving said cutting tools
and move said tools inwardly of said support,
transversely andv radially of said stock, means to
means for controlling the rate of exhaustthere;
rotate said cam means, said means comprising
from to controlthe speed- of advance of saidtools,
35
said means comprising a variable control valve
anda shunt, a shut-off valve in said shunt and
means operable to close said shut-on valve when
said tools are, movedadjacent said stock‘ where
by 'said tools may be moved rapidly inwardly
until they approach said stock and are thereafter
moved inwardly at a rate controlled: by said vari
able control valve.
"
'
at least one hydraulic'cylinder, means‘foradm‘it
ting ?uid under pressure thereto to mov'e'said
tools inwardly of said‘support, means for eon
trolling the rate of exhaust or ?uid therefrom
to control the speed of’adv'ance'of said tools‘, said
ineans'comp'rising avariabl'e' control valve and a
shunt, ashut-off ‘valve in‘ said‘ shunt, a camfol
'
2. A machine tool for-severing elongated bar ,
lower operative‘ly connected to said‘s'hut-ofl‘ valve,
a cam operable by said hydraulic means engaged
by ‘said follower 'tdsl‘iut oft‘sai'd shut-01f valve
or‘pipe stock, comprising. meanszfor rotating the ' when said tools are moved adjacent said ‘stock
stock on its longitudinal axis, a tooll's’upport hav
whereby‘ said tools may be‘ moved rapidly "in
wardly until ‘they approach sai'd' stock and are
thereafter‘ moved‘ inwardly at a slower‘ and con
ing an opening th'erethrough adapted to encom
pass said stock while held by said rotating means,
a plurality of cutting tools sli'dably. mounted on
said'su'pport for movement'transversely and radi
troil'ed rate'of speed‘.
50
ally of the longitudinal axis of said stock, a ro
tatable cam plate ~ior moving said, cutting tools
transversely and radially of said stock; means to
rotate said cam‘ plate, said m'eansco'mprising a
gear segment on said‘ rotatable cam plate, a rack
engaging said ge‘arsegm'ent, a‘ pair of opposed hy
_
‘-
‘
'
'
"
~
‘"5; A machine tool for "severing elongate'd?bar
or; pipe "stock, vcomprising means for‘ rotating‘ the
stock‘ on its longitudinal axis, a‘ tootsupporthav
ingv an Opening‘ therethrough adapted ‘to’ encom
passfsai'd‘ stock while held ‘by said‘ rotating means,
a‘ plurality of ‘cutting tools 'sli’da‘b'ly mountedon
said support for movement transversely'and'radi
ally "of, the ,longitudinala'Xis“ of said‘ stock; rotat
able cam 'm‘eansMfonmoi/mg’ said cutting tools
draulic cylinders connected torthe opposite ends
of said rack" for'reciprocating"the‘isaine‘, means '
for admittingl?uid ‘under pressureto one‘ of said i
‘cylinders to thereby movefnsaid’ tools inwardlyv of
60
saidsupport,‘ means controlling therateof ex‘
transversely and ’ ra‘diallyof "said ‘stock; means' to
rotate‘ said cam means; saidm'eans' comprising‘ at
leastyon'e ‘ hydraulic cylinder " connected‘ thereto‘,
liaust of fluidr from the other of said cylinders ‘to
control the speedof movement-of said rack, said
means- for admitting- fluid‘ under pressure» thereto
means‘ comprisinga variable controlivalve and‘ a Y
to movesai'd‘ tools inward-lyof said support, means
for controllingthe- rate of exhaust or fluid there
shunt, a shut-off valve thereirrfa‘ eam‘follower 65 from
'tofeontroll theisp‘eed' or"- advance oflsaidl tools,
operatively’,connected'to “said shut-off valves,"_a
said means‘ comprising a variable control valve
cam on‘ said rack’ engaged. by sai‘dlfollower'to'shnt
oil said valve after said'racli‘has‘moved'a pre ‘.
termined distance ‘tofbfring' said tools adjacent,
and‘ a shunt, a shut-off valve in said shuntfan'd
means responsive: to’ the movement of,- said: cam
rotating means to‘, close said shut-oil-valve'where
said stock wherebyls'aid',tools’may {be jmovedjrap 70 by
said, tools may, be moved rapidly inwardly until
idly inwardly untilj'theyappro'ae'h said‘ stool; ‘and
they approach» sai_ stools and- are ‘thereafter
are thereafter ‘moved?inwardlyjat a slower and
controlledratejoffspeed.
'j
'_ ’ '.
" . j _ A, V,
r
‘,3.~ A ,machineftool for ‘severing elongated‘ bar
or'pipe‘ stock," comprising means‘ for'rota‘ting ~the
moved
‘ i
inwardly atja
’
slower
ANDREW
control-led;
VB.‘ N'EsBrrn'
rate.- ,
7,5
SAMUEL WEBB.
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