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Патент USA US2116639

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May 10, 1938.
2,116,639
E. J. PROTIN
METAL THREADING APPARATUS
Filed’ Oct. 14, 1936
8 Sheets-Sheet 1
km.
May 10, 1938.
‘
E. J. PROTIN
2,116,639
METAL THREADYING APPARATUS
Filed Oct. 14, 1936
8 Sheets-Sheet 2
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INVENTOR _
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May 10,. 1938.
E. J. PROTIN
2,116,639
METAL THREADING APPARATUS
‘Filed Oct. 14, 1936
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May 10, 1938.
E. J. PROTIN
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METAL THREADINQ APPARATUS
Filed Oct; 14, 1.936
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METAL THREADING APPARATUS
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Patented May 10, 1938 . r
v UNITED STATES
PATENT O'FFICET
- 2,116,639
,
METAL THREADING APPARATUS
Edward J. Protin, Charleroi, Pa., assignor to Pitts
burgh Steel Company, Pittsburgh, Pa., a cor
poration of Pennsylvania
Application October 14, 1936,.Serial No. 105,539,
4 Claims, (Cl. 16-105)
My invention relates to threading devices for
pipes and the like, and more particularly to chuck
apparatus used in connection therewith.
One object of ,my invention is to provide an
5 improvedmanner of aligning and gripping a pipe‘
or the like in an externally gripping chuck, rela- V
view on an enlarged scale taken on the line X-X
of Fig. 1; Fig. 11 is a view‘ taken on the line
XI——XI of Fig. 10; Fig. 12 is a plan view, part
ly in section, of the carriage for supporting the
chuck apparatus; Fig. 13 is a view taken on the
line )HII-XEH of Fig. 12, and Fig. 14 is a View
taken on the line XIV-—XIV of Fig. 12. tive to threading tools.
Referring ?rst to Figs. 1 to 4, I show a thread
Another object of my invention is to provide
in a chuck apparatus which is movable toward ' ing machine A and chuck apparatus B for moving
the pipe into position to have threads cut thereon
10 threading dies and which has a range of rapid ' by the threading machine. The threading ma
traveling movement‘ and a range of slower ad
vancing movement, means for automatically chine per se does not constitute a part of my in
stopping the rapid travel of ‘the chuck when it vention, but may be of any various known types
reaches apredetermined position with relation and will, therefore, be described here in some
what general terms.
16 to the-threading device.
A further object of my invention is to pro?
vide in a chuck carriage of the character re
ferred to, mechanism‘ for mechanically advanc
ing the chuck apparatus, and mechanism for
manually advancing the same, in combination
2
with means for automatically disconnecting the
manual advancing means when the mechanically
actuated advancing means is in operative posi
tion.
‘
25
‘Still another object of my vinvention is to‘ pro
vide in traveling chuck apparatus of the char
acter referred to, a stop gauge for engagement
by the end of a pipe which is inserted in the
chuck apparatus preliminary to a threading oper
30 ation, the stop device being automatically mov—
able out of the path of the pipe as it is advanced
‘
15
The threading machine is mounted on a base
l0 and comprises a casing or housing H within
which is mounted a spindle l2 secured within a
supporting sleeve l3 (Fig. 11), the Sleeve ‘being >
rotatable in bearings 14 and 15, formed in the
end walls of the casing. The spindle l2 has a
?ared end I6 to which is bolted a head or holder
I8 within which’ are mounted threading chasers'
‘or dies 18a, commonly termed receding chaser
dies, which are radially movable toward and from
threading position. Amotor I!) (Fig. 1) is mount
ed on the casing II and drives a shaft 20 on
which are mounted pinions 2| and 22 with which
gear wheels 23 and 24 can be respectively brought
into engagement after the manner of ordinary
change-speed mechanisms. The gear wheels 23
to a threading die and being automatically re- . and 24 are mounted upon a shaft 25 that also
gear wheels 26, which mesh with gear
stored to operative position upon withdrawal of carries
wheels 21 that are mounted on a shaft 28. The
" the pipe from the threading tool.
.
V
shaft 28 carries a pinion' 29 which drives a ring 35
35
Another object of my invention is to provide a
gear 3|] that .is'secured to the sleeve l3, which
chuck apparatus having a set of chuckjaws for sleeve
is in turn keyed to the spindle I2. The
aligning a pipe, or the like, and a second set of driving connections just described serve‘ to rotate
chuck jaws for holding thev pipe against the‘
torque of threading tools, the second-named jaws
40 being so supported as to permit of their automatic
accommodation to the aligned position of the‘
pipe.
.
In the accompanying drawings, Figure 1 is a
front elevational view of the ‘chuck apparatus and
45 the threading machine; Fig. 2 is a rear eleva
tional view thereof; Fig.3 is an end elevational
view of the chuck apparatus; Fig. 4 is a view
taken on the line IV-IV of Fig. 1; Fig. 5 is a
‘view taken on the line V—-V of Fig. 4; Fig. 6 is an
vto
enlarged view'looking in the direction of the ar
rows VI——VI of Fig.j 2, partly in section; Fig. '1
the threading head l8.
.
_
The chuck apparatus includes a housing 32 40
.which is mounted upon a carriage 33 that is sup
portedupon slideways 34 which are carried by
Tthe base l0. whereby the carriage can be moved
toward and from the threading mechanism‘in a
45
manner to be hereinafter described.
A pipe-gripping chuck 35 and a pipe-aligning
chuck 36 are mounted within the casing 32 and
.are of somewhat similar structure. The pipe
aligning chuck 36 includes three jaws 31 which
are movable radially of the chuck body 38, in 50
suitable guideways‘38a, formed therein, the chuck
body 38 being an integral part of the casing 32.
The jaws 31 are radially movable by means of
the apparatus of Fig. 1; Fig. 8 is a view taken ‘screws 39 which have threaded engagement
on the line VIII--VIII of Fig. 7; Fig. 9 is a view
taken on the line IX-—IX of Fig.-7; Fig. 10 is a therewith, and each of which carries a bevel
55
- is an enlarged elevational view of a portion of
2
2,116,639
pinion 48 that is secured to its screw shaft 39. At
its outer end, the screw shaft extends through a
bearing bushing 4|, a thrust bearing 42 being
interposed between the pinion 48 and the adja
Cl . cent wall of the casing.
The chuck jaws 31 are moved inwardly- and
outwardly by a bevel ring gear 43 which meshes
with the pinions 48. A spur ring gear 44 is rigidly
- secured to the bevel ring gear and the ring gears
10 are oscillated by a rack bar 45 which meshes with
the spur ring gear. It will be seen that oscillation
of the ring gears will effect radial movements of
the chuck jaws to engage and release a pipe 46.
The ring gears 43 and 44 are rotatably supported
15 upon a hub-like portion of an end plate 41, of
the chuck body portion 38 of the casing 32.
The rack bar 45 has pivotal connection with
20
25
30
35
tion of the carriage is mechanically e?z‘ected by a
feed screw 13 which advances the carriage rapid
ly until the front end of the pipe is in position
adjacent to the threading tool. A feed screw 14
thereafter advances the chuck carriage slowly
while the threading operation is being performed.
The feed screw 14 is journalled at 15 and 16 in
the lower portion of the housing II and extends
to the opposite end of the base I8, as shown more
clearly in Figs. 1, 11 and 12, where its opposite 10
end is supported in a bearing ‘I1. The feed screw
13 is similarly supported in bearings 18 and 19,
Figs. 10 and 12.
.
The feed screws are driven from the ring gear
38, through a ring gear 98 that is mounted upon 15
the rotating sleeve member I3 and meshes with
a gear. wheel 8|, the gear wheel 8| being mounted
a piston rod 48 which extends into a cylinder 49 upon a shaft 82 which is~ supported in the lower
and has a suitable piston, so that when ?uid part of the casing II and carries gear wheels 83,
pressure is admitted to the ends of the cylinder 84 and 85. The high-speed shaft 13 carries 20
alternately, the rack bar will be reciprocated. change-speed gear wheels 86 and 81 which are
Suitable ports 58 and 5! (Fig. 6) are provided ' selectively shiftable into engagement with the
for admitting and exhausting ?uid pressure into gear ‘wheels 83 and 84 respectively. The pre
the ends of the cylinder 49. A manually operated liminary feeding or advancement of the pipe to
valve 52 is provided for controlling ?ow of ?uid the threading tool may be faster where the pipe 25
through the ports 58 and 5!. When the pipe 46 is of relatively light weight, in which case the
is placed between chuck jaws 31, preliminary to gear wheel 85 will be brought into engagement
threading,’ the valve 52 is operated to effect with the gear wheel 83. For slower advancing
downward movement of the rack bar 45 to cause speeds for heavier pipe, the gear wheel 81 will
rotation of the pinions 48 and closing move _ be brought into engagement with the gear wheel 30
ment of the chuck jaws 31, for the purpose of 84. The gear wheels 86 and 81 are manually
bringing the pipe into axial alignment with the ' operated by shifting fork 88, from a lever or
threading tool l8. Operation of the valve 52 in pedal 89 (Fig. 10).
>
reverse direction will, of course, effect retractive
The slow feed shaft 14 is provided with change
movement of the rack bar 45 and opening of speed gears 98, SI, 92 and 93 which are keyed 85
the chuck jaws.
_
‘
The chuck 35 serves primarily-to rigidly grip
and hold the pipe against turning movement
under the torque of the threading dies, and in
thereto, and which may be selectively engaged
by change-speed pinions'94, 95, 96 and 91 re
spectively. These pinions are slidably mounted
housing 32 in substantially the same manner as
upon a counter-shaft 98 and are shiftable there
on by means of shifting forks 99 and I88. The 40
counter-shaft 98 carries a gear wheel I8I which
that in which the chuck jaws 31 are mounted in
the chuck body 38. The chuck jaws 54 are
meshes with the gear wheel 85. The change
speed gears just referred to are utilized to effect
40 cludes jaws 54 which are mounted in the chuck
operated by a rack bar 56 in the same manner _ various rates, of advancing movement of the pipe
45 as the chuck jaws 31 are operated by the rack into the threading tool, in accordance with the 45
bar 45.
The chuck body 35 is supported by
hanger bolts 63 and springs 64 that are in turn
supported upon bridge plates 65 which are _se
cured to the upper edge of the casing 32.’
The rack bar 56 is operated from a piston and
50
cylinder 68 which is controlled by-a hand-oper
ated 'valve 69 (Figs. 1 and 3) the operation be
ing the same as described in connection with the
rack bar 45 and the piston and cylinder con
55 struction 49. Fluid pressure for the cylinders at
49 and 68 may be generated by a motor 18 and a
compressor 1| driven thereby; ?ow of ?uid from
the compressor to the pistons being controlled by
the valves 52 and 69, as heretofore explained.
60
The provision of the aligning chuck 36 is of
particular utility because the chuck jaws 31 are
smooth faced and do not bite into the pipes. as
do the usual holding jaws such as the jaws 54.
The peripheries of pipes are not usually of uni
65 form hardness, and the teeth of the respective
holding jaws 54 will, therefore, not all bite into or
indent the pipe to the same depth. There is con
sequently a tendency toward slight misalignment
of the pipe by the usual toothed holding jaws,
70 which danger is avoided where smooth faced
aligning jaws, such as 31, are employed to pre
vent such misalignment.
As heretofore stated, the chuck carriage 33 is
mounted upon the slideways 34 for movement to
75 ward and from the threading tool. Reciproca
pitch of thread being cut on the pipe. In other
words, if a thread of very small pitch is being
cut, the pinion 91 will be brought into engage
ment with the gear wheel 93, and for larger
pitch threads the pinion 94 will be brought into 50
driving engagement with the gear wheel 98, etc.
The high-speed feed shaft 13 has two wide
pitch helical threads reversely arranged with re
spect to one another, one thread being employed
when advancing the chuck carriage and the other 66
thread being utilized to effect retractive move
ment thereof. A cylindrical nut I83 has engage
ment with the advancing thread of the shaft 13
and is positioned between the clutch or gripping
members I84 (Figs. 12 and 13). The nut I83 60
is held against movement in one axial. direction
longitudinally of the carriage by a ?ange I85
that is formed integrally with, the nut and en
gages a thrust bearing I86 that abuts against a
plate I81 which is rigidly mounted in the car 65
riage. Movement of the nut I83 in the opposite
direction is prevented by reason of its abutment
with a nut' I88 that is similarly formed and
‘mounted, ‘and engages the reverse thread of the
shaft 13.
_
70
When the nut I83 is held vagainst rotative
movement, rotation of the shaft 13‘ will cause the
chuck carriage to advance rapidly toward the
threading tool. The gripping jaws I84 for pre-'
venting rotation of the nut I83. are operated by
3
2,116,639
a shaft IIO that has threaded engagement with
swivel nuts III (Fig. 13) which are ‘oppositely
threaded. When the shaft I I0 is rotated in one
direction, the grippingvjaws I04 whicirare con
nected at their lower ends by a link II2 will be
drawn into tight‘ engagement with the nut I03.
Turning of the shaft H0 in the opposite direc
tion will, of course, cause release of the nut. The
shaft H0 is journalled in bearing bushings such
as II4, formedv in the carriage 33. A hand lever
H5 is secured to one end of the shaft H0.
The shaft IIO, at its other end, has geared
pinion I3I and push the rod I32 to'the left. The
shaft of the pinion I3I is provided with a crank
like extension or arm I33, which carries a roller
I34.
By the movement just referred to, the
crank I33 is turned in a counter-clockwise di
rection to the position shown in dotted lines in
Fig.
.
‘
As the chuck carriage advances, it carries with
it the rack bars I30 and I32. During this ad
v'ancing movement, the roller I34 will be brought
into engagement with a camming member I35
which is rigidly mounted upon the base of the
connection at II6 with a shaft II‘! which extends
machine.
parallel to the shaft H0, and through mecha
clockwise direction, to effect clockwise rotation of
15 nism such as that shown in Fig. 13, controls a
clutch, or gripping jaws, IIB for the nut I08.
When the lever H5 is turned in one direction,
the clutch members I04 are drawn together, and
the clutch members II8 released. while when
20 turned in the opposite direction, the clutch mem
bers I04 will be released and the clutch members
II8 caused to engage the nut I08. In the latter
instance, the chuck carriage will be retracted
quickly ‘at the completion of a threading opera
26 tion.
The clutch lever II5 has a neutral posi
tion, as shown in Fig. '7, wherein the clutches I04
and H8 are both out of gripping engagement
with their respective nuts.
This cam tilts the crank‘ I33 in a
the rack pinion I3I and consequent shifting of 16
the rack bar I30 to the left, with the result that
the lever H5 is turned in a clockwise direction
a distance sufficient to effect release of the feed
nut I03, and thus automatically bring the car
riage to a stop. The lever I24 can then be oper
ated to effect slow advance movement of the
carriage as above described. '
At the completion of a threading operation,
the lever I24 will be swung to its released posi
tion, the threading tools disengaged from the
pipe, and the lever II5 then swung to bring the
retracting clutch II8 into gripping engagement
with the nut I08, to effect rapid retractive move
A divided nut I20 is arranged to be brought ‘ ment of the chuck carriage. During retraction
30 into cooperative engagement with the thread of movement of the chuck carriage, the rack bars I30 and I 32 will be carried rearwardly until a
‘ . the slow-feed shaft ‘I4 when the carriage is in
advanced position with the pipe adjacent to the nut I38 on the forward end of the bar I32 en
gages a stop I39, whereupon continued rearward
threading tool and the advancing nut I03 re
movement of the carriage will cause the pinion
leased, (Figs. 12 and 14). Engagement and dis
engagement of the nut I20 with the shaft ‘I4 is
effected by \a screw shaft I2I that has reversely
threaded engagement with the respective halves
of the nut I20. The halves of the nut _I20 are
mounted upon rods I22 which are supported in
40 a frame I23 suitably secured within the carriage
33. The shaft I2I is operated‘ by a‘ hand lever
I24.
'
‘
advanced when the levers I I5 and I24 are in neu
'
The lever H5 is provided ‘with a gear sector
I25‘3whose periphery is grooved rearwardly of its
45 teeth, to form a flange I26 at its rear face, as
shown in Figs. 7 and 12. The ?ange has a slot I2‘I
cut therethrough into which may enter a flange
I28 formed on a segmental extension carried by
the lever I24, when the parts are in the position
50 shown in Fig. 7. As above explained,»the lever
I I5 in Fig. 7 is shown in its neutral position with
the high speed nuts of the shaft 13 released. At
this time, the lever I24 can be swung clockwise
to bring the slow-feed nut I20 into engagement
The lever H5 is, therefore,
locked against movement while the lever I24 is
in its operative position. On the other hand,
55 with its shaft ‘I4.
when the lever I24 is in its released position, as
shown in Fig. ".7, the lever II5 can be turned to
60 effect either advancing or retractive movements
of the chuck carriage. In either of these posi
tions, the slot I21 ‘will be out of registry with
the ?ange I28 of the lever I24, and the lever
' I24 is, therefore, positively maintained in‘ its
65
released position.
.
.
.
The rapid advancing movement of the chuck
carriage is automatically limited by the gear sec-v
tor I25 operating upon a rack bar I30 which is
slidably mounted on the chuck carriage, and
70 which meshes with a rack pinion I3I that in turn
engages a slidably mounted rack bar I32 (Figs.
7 and ~12).
I33 to rotate on the rack bar I32 and such rota
tive movement will effect movement of the rack
bar I30 rearwardly, thus rocking the gear seg-,
ment I25 to bring the lever II5 to neutral posi
tion, and thereby automatically stopping rear
ward travel of the carriage.
If desired, the chuck carriage can be manually
When the lever II 5 is turned in a
counter-clockwise direction to effect rapid ad
vancemovement of the chuck carriage, the rack
75 bar I30 will be shifted rearwardly to rotate the
tral positions, by means of a hand lever I40, that
operates a pawl and ratchet mechanism I“ for
rotating a shaft I42 (Figs. '7 and 9). The ratchet
wheel is loosely mounted on the shaft I42 and
is'normally held in driving engagement with a
clutch disc I43 by a spring I44. The clutch disc‘
I43 is rigidly secured to the shaft, and the shaft
carries a pinion I45 that meshes with a gear
wheel I46 which is mounted on a shaft I41 ‘that
carries a rack pinion I48. The rack pinion I48
meshes with'a‘rack bar I49 that is secured to
the under side of one of the stationary guide rails,
34. It willbe seen that when the lever I40 is
oscillated, the chuck carriage will be gradually
advanced'along the track slide or guideways 34. .
It is. important that the manually operated
lever I40 be automatically declutched when the
automatic feeding and retracting mechanisms 60
are in operation. To this end I provide on the
rack bar I30 a reduced section at I50 which, ‘
when the lever H5 is in neutral position, will lie
behind a lever arm I 5I which is fastened on a
rock shaft I52. ‘The rock shaft carries a clutch 65
fork I53 whose ?ngers engage the'inner face of
a disc I54. In the position of the parts shown in ,
Figs. 7, 9 and 12, thereduced portion I50 is
behind the lever I5I with the result that the
spring I44 is operative to maintain driving en
gagement of the clutch surfaces between the
ratchet wheel and the clutch disc I43. When
the lever H5 is shifted to effect advance or re
tractive movement of the chuck carriage, the rack
bar I30 is, of course, shifted and the lever I5I 75
m4
rocked to force the clutch fork I53 against the
wearing disc I56, thereby forcing the ratchet
wheel I4I away from the clutch disc M3, against
the pressure of the spring I44. The carriage will
then be moved independently of the hand lever
I40.
‘
anism for pipes and the like, of a chuck carriage,
a wide-pitch screw and nut device for moving
the carriage toward and from the die mecha
nism at a rapid rate, av smaller pitch screw and
nut device for advancing the carriage at a slower 5
rate, a rack bar mounted on a stationary sup
In order that a pipe to be threaded can readily
port for longitudinal movement thereon, a rack
be positioned in the chuck carriage with its
forward end projecting a proper distance from
10 the carriage, I provide a gauge stop I60 (Figs.
1, 2 and 4) that is secured to a rod I6I. At
its one end, the rod IIiI is rigidly secured against
endwise movement, but rotatably supported in
bar carried by and shiftable longitudinally of
a bracket I62 that is formed on the casing 32,
15 and at its other end, the rod I6I is slidably
supported in a bracket I63 that is carried by
the casing II. The rod I6I carries an arm I64
which is provided with a cam roller I65 that
cooperates with a cam track I66 of a bracket I61
20 which is secured to the casing II.
It will be
seen that when the lever H5 is moved to cause
rapid advance movement of the carriage 33, the
rod I6I will be moved therewith, causing the
the carriage, said bars being disposed parallel
to the path of carriage movement, a pinion mesh 10
ing with the rack bars and journalled in the car
riage, a lever on the carriage movable in oppo
site directions from a neutral position, to selec
tively effect forward and rearward driving en
gagement between the wide-pitch screw device 15
and the-carriage, a connection between said lever
and the second-named rack bar whereby the bar
is shifted longitudinally when the lever is moved
and whereby the lever is moved through move
ment imparted to said bar by the pinion, means 20
for imparting rotative movement to the pinion
at a predetermined advanced position of the
carriage, for shifting the lever to neutral posi
roller I65 to move along the cam track I66
tion, a stop device for limiting rearward move
and rock the‘ shaft I6I. Rocking of the shaft
IBI causes the gauge stop I60 to be raised to
the position as shown by the dotted lines in Fig.
4, in which position it will be above the thread '
ment of the ?rst-named rack bar whereby the 25
pinion is rotated to effect movement of the lever
to neutral position at a predetermined point in
ing head that projects forwardly from the hous
ing II, so that continued advancing movement
of the chuck carriage can be eiTected without
interference of the gauge I60 with the threading
devices. During withdrawal movement of the
carriage 33, after a threading operation, the bar
I6I will also be drawn back, so that the gauge
arm I60 will fall in front, of ‘the threaded end
the rearward travel of the carriage, a lever on
the carriage~ movable to effect driving engage
ment between the smaller pitch screw device and 30
the carriage, a lever-actuated device for man
ually advancing the carriage, and means for
disconnecting the last-named lever from the car
riage when the ?rst-named lever is in operative
of the pipe and thus be in position to serve
position.
3. The combination with threading die mecha
nism for pipes and the like, of a chuck carriage,
as a positioning stop when another pipe is in
serted into the chuck apparatus.
carriage toward and from the die mechanism at a '
I claim as my invention:
1. The combination with threading die mech
anism for pipes and the like, of a chuck car
riage, a wide-pitch screw and nut device for
moving the carriage toward and from the die
35
awide-pitch screw and nut device for moving the
rapid rate, a smaller pitch screw and nut device for 40
advancing the carriage at a slower rate, a rack bar
mounted on a stationary support for longitudinal
movement thereon, a rack bar carried by and
shiftable longitudinally of the carriage, said bars
being disposed parallel to the path of carriage 45
mechanism at a rapid rate, a smaller pitch screw
and nut device for advancing the carriage at a
slower rate, a rack bar mounted on a stationary
movement, a pinion meshing with the rack bars
support for longitudinal movement thereon, a
rack bar carried by and shiftable longitudinally
riage movable in opposite directions from a neutral
of the carriage,-said bars being disposed parallel
ward driving engagement between the wide-pitch 50
and journalled in the carriage, a lever on the car
position, to selectively e?’ect forward and rear
to the path of carriage movement, a pinion mesh
screw device and the carriage, a connection be
ing with the rack bars and journalled in the. tween said lever and the second-named rack bar
carriage, a lever on the carriage movable in whereby the bar is shifted longitudinally when
opposite directions from a neutral position to the lever is moved and whereby the lever is moved
selectively effect forward and rearward driving through movement imparted to said bar by the 55
engagement between the wide-pitch screw device pinion, means for imparting rotative movement to
' and the carriage, a connection between said
the pinion at a predetermined advanced position
lever and the seco’nd—named rack bar whereby _ of the-‘carriage; for shifting the lever to neutral
the bar is shifted longitudinally when the lever position, a stop device for limiting rearward move
is moved and whereby the lever is moved through . ment of the ?rst-named rack bar whereby the
movement imparted to said bar by the pinion. pinionis rotated to effect movement of the lever to
‘means for imparting'rotative movement to the neutral position at a predetermined point in the
pinion at a predetermined ,advanced position of rearward travel of the carriage, a lever on the
the carriage, for shifting the lever to neutral carriage movable to effect driving engagement
position, a stop device for limiting rearward between the smaller pitch screw device and the 65
movement of the ?rst-named rack bar whereby carriage, a lever-actuated device for manually ad
the pinion is rotated to effect movement of the , vancing the carriage, means for preventing opera
lever to neutral position at a predetermined tion of the second-named lever when the ?rst
point in the rearward travel of the carriage, a
named lever is in operative position, and means
70 lever on the carriage movable to effect driving for disconnecting ‘the said lever-actuated device 70
engagement between the smaller pitch screw de
from the carriage when the first-named lever is
vice and the carriage, and means for preventing in operative position.
‘
operation of either of said levers when the other 4. The combination with thread die mecha
lever is in operative position.
,
nisms for pipes and the like, of a chuck carriage,
2. The combination with threading die mech
a wide-pitch screw and nut device for moving the
16
9,1 16,639
carriage toward and from the die mechanism at a
rapid rate, means for'advancing the carriage at a
slower rate, a rack bar mounted on a stationary
support for longitudinal movement thereon, a
rack bar carried by and shiftable longitudinally
of the carriage, said bars being disposed parallel to
the path of carriage movement, a pinion meshing
with the rack bars and journalled in the carriage,
5
by the lever is moved through movement im
parted to said bar‘ by the pinion, means for im
parting rotative movement to the pinion at a
predetermined advanced position of the carriage,
for shifting the lever to neutral position, a stop de
vice for limiting rearward movement of the ?rst
named rack bar whereby the pinion is rotated to
effect movement of the lever to neutral position
at a predetermined point in the rearward travel
of the carriage; a lever-actuated device for
effect forward and rearward driving engagement manually advancing the carriage, and means for
‘between the wide-pitch screw device and the car- , disconnecting the said lever-actuated device from
riage, a connection between said lever and the the carriage when the ?rst-named lever is in
second-named rack bar whereby the bar is shifted operative position.
EDWARD J. PROTIN.
15 longitudinally when the lever is moved and where
a lever onthe carriage movable in opposite di
10 rections from a neutral position, to selectively
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