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Патент USA US2411932

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Dec. 3, 1946.
1_, _1_ MITCHELL
Patented Dec. 3, i946
lLouis J. Mitchell, Cleveland, Ohio, assignor, by
j mesne assignments, to Jack & Heîntz Precision
Industries, Inc., Cleveland, Ohio, a corporationv `
of DelawareA
Application June 16, 1945, Serial No.l 599,718
2 claims. (01.' slr-s)
This invention relates in general to automatic
metal Working Vmachines and more particularly to
automatic work ejecting means for thread rolling
Ink thread rolling machines it is common prac
i tice to‘have one threaded die adjustably secured
to the stationary frame of the 1machine and to
have a complementary threaded- die adjustably
secured to a movable carriage which latter is ad
.instable to bring its threaded die into predeter
mined spaced parallel relationship with the sta
ing device carried by the frame and showing «the
carriage in the midst of its work threading stroke;
Figure 2 is asimilar View with the frame broke-n
away to show the position of thework ejecting
device in inoperative horizontal position yat the
star-t of the forward stroke of the carriage; »'
» Figure 3 is a view similar-to Figure 2 near the
completion ofthe forward stroke of the carriage
showing the work ejecting lever> raised from its
previous horizontal position to a vertical position
to eject the work at the completion ofthe stroke;
tionary die, the carriage beingv automatically
,ì Figure 4 is a detail view in elevation of a double
driven back and forthl parallel with ’the frame at
a predetermined speed and length of stroke at
land bolt after spiral threads have been pressed
least equal to the length of one of the dies. The
Figure 5 is an enlarged detail View ~in si-del
elevation ofthe work ejection device in the ver
Work may comprisean unthreaded bolt which is
fed into the space between the dies at -thestar-t
ofthe stroke of the movable driven die. The bolt
is compressed between the dies and rotatably car
tical yposition and taken along line 5_5 of Fig
ure 3;
Figure 6 is a v-iew similar to Figure 5 showing
ried to the opposite endv of the stationary die by
Ithe driven die While the bolt is having a spiral
screw thread pressed thereinto.` It is of utmost
the work ejection -device in inoperative horizontal
vpositionv and taken along line‘6-6 of Figure 2;
importance that the bolt be positively ejectedat
Figure 7 is an enlarged detailend view .of the
the completion of this forward stroke. Failure of
such ejection results in the bolt being carried back
„bracket for supporting the work ejecting device.
between the dies on the backstroke and a conse
the stationary frame I has adjustably secured
Referring’more particularly to the drawings,
quent ruining of the bolt and, more important,
the damaging of both of the expensive threaded
dies. Experience has shown that gravity alone or
ineilicient makeshift ejection devices lacking in
positiveness cannot be relied upon for the highly
important feature of ejection.
It is, therefore, one of the primary objects of
the present invention to provide such a positive
automatic work ejecting device whose action is so
`correlated between the relative movements of the
two relatively movable threaded dies that it will
remain out of the path of the bolt during its for
ward travel between the dies and be actuated at
thereto a block 9 to which is secured by a suitable
bracket 2 and bolt 3 a thread die'4. Mounted
Yslidably on the frame is a carriage 5 that also has
adjustably secured thereto by a suitable bracket
6 and bolt 'I> a thread die 8. The two opposed
faces of the thread dies are so threaded as to
press the work, such as a bolt, to form a con
tinuous spiral screw thread as it is rolled by the
relative longitudinal parallel movement of the die
faces which engage the bolt. The adjustability
fof the ltwo dies, in accordance with usual prac
tice, should be such as permit Vertical longitu
dinal and lateral adjustment to respectively ad
4a predetermined point in such 4travel to follow
the bolt and` moreover contact the latter in full
' length flatwise engagement to positively eject the
.threaded bolt at the very end of the stroke just
prior to the start of the back stroke.
With the foregoing and other objects in view,
the invention resides in the combination of parts
and in the details of construction hereinafter set
forth in the following specification and appended ’
claims, certain embodiments thereof being illus
trated in the accompanying drawings, in which:
Figure l is a View in perspective of a portion
of a thread rolling machine showing »one threaded
die carried by the stationary frame and another
carried by a reciprocating carriage showing the
adjustable bracket for supporting the work eject-
just alignment of threads, effective length of re
ciprocatory stroke of the carriage and the space
between the threaded faces for dilferent thick
nesses of work to be engaged between the threaded
The Work ej ecting device is carried by a bracket
IIJ having a pair of elongated slots II to receive
bolts I2 to adjustably secure .the bracket to the
kstationary frame I. This bracket has pivotally
secured -to its other end at I3 the work ejecting
lever I4. Lever I4 carries a pin I5 that rides on a
ledge I6 of the carriage 5 Ibelow its die 8. Bracket
I 0 has a .pin I1 around which is hooked one end
of a tension coil spring I8 whose other end is
hooked to lever I 4 below pin I3.
Figure 2 shows the relative positions of the car
riage 5 and the lever I4 prior to the beginning
of the forward stroke of the carriage. The lever
faces one of which is carried by a stationary
frame and the other by a carriage reciprocably
movable parallel therewith in spaced relation to
I4 is horizontal as pin rests on 'ledge I6 of the
receive therebetween a bolt to be carried forward
carriage Well below the lower edge of the car
by the forward stroke of said carriage as the
riage die 8, as well as that of the base die 4. It
bolt is rolled and compressed to have va continuous
is at this point in the sequence of operation that
spiral screw thread pressed therein‘by the threads
the worksuch' as a bolt I8, shown in Figure 4 as
of said’dies, a device for ejecting said bolt upon
having twofspaced lands 20 and 2I‘,- is inserted
completion of the forward stroke of the carriage
in a vertical attitude between the front portion
of the carriage die 8 and the rear portion of the 10 and prior to the start of the backstroke thereof,
said ejecting device comprising an adjustable
base die 4. Prior to such insertion the lands
bracket carried by said frame and carrying a
are unthreaded and have a smooth exterior sur
‘ pivoted 'lever operable within a plane lying be
Forward movement of die' 81 carries the bolt for
wardly as the latter is compressed and rotated in
engagement with the threads of the two dies 8
and 4. During the major portion of the forward
travel of carriage 8 the bolt ejecting leverY I4
remains in its horizontal position of Figure A2
tweensaid die ¿faces and normally maintained
horizontal and vbelow the lower edges thereof,
means on said lever engageable by said carriage
near the end of its forward stroke for operating
said =lever to swing it into a Vertical position to
engage the major portion of said bolt in fiatwise
completely out of the path of travel of the bolt 20 Contact from the rear to Vpositively eject .the
between the two thread dies. At practically the
2. In combination with a thread rolling ma
completion of the'i'or'ward stroke of the carriage
chine having apair of dies with' opposed threaded
its rear vertical ledge'Z'rZ,-` whichy is in alignment
faces one of which is carried .by a 4stationary
ywith therear edgefof die 8, ‘engages vpin YI5 of
’the ejecting lever. VThis rocks lever I4 in a 25 frame and the other by Ya carriage reciprocably
movable parallel therewith in spaced relation to
counterclockwise direction from its horizontal
receive therebetween a bolt ’to 'be carried for
position of "Figure 2- to its vertical position of
ward by the forward stroke-of said carriage as
Figure 3 about its pivot I3 against the action of
the bolt is rolled and compressed tohavea con
tension coil spring I8. 'The height vof lever I4
is preferably vsuilìcient to extend atleast to the 30 tinuous spiral screw thread _pressed therein -by
the threads of said dies, a device forv ejecting said
top edges of the dies and consequently engages
bolt upon completion ofthe forward stroke of
a substantial portion >of the length of the bolt,
the carriage and prior to the startlof the back
if not all except the bolt head. This timed action
stroke thereoisaid ejecting device comprising
of the ejecting lever I4 insures a positive ejection
of the bolt after it has had its spiral threads 35 an vadjustable bracket carried by said 'frame-and
carrying a pivoted .lever operable' within a plane
pressed into its lands, ’as shown in ‘Figure 4.
lying between said‘die 'faces and ‘springmeans
It lfollows that the backstroke which starts
l,for normally maintaining said lever' horizontal
immediately after the ejection of the bolt re
and below the lower> edges of'said dies, a pin
moves the pressure of wall 22 upon pin' I5. Con
carried by said lever to be engaged by a groove
sequently spring, I8 exerts its force to Vrock lever
in said4 'carriage‘and adapted to be' forced’by
I4 counterclockwise about pin I3 from a vertical
the rear end of said groove near Vthe completion
position of Figure 3 back to its horizontal in
cf the forward stroke of the carriage 'to rockv the
operative position of Figure 2 as the two thread
lever` about its. pivot against 'the action of said
dies are in position to receive another bolt for
45 spring into a vertical attitude andinto’ ñatwíse
another threading operation.
Contact with the length of the bolt to `positively
I claim:
the same.
1. In combination with a thread rolling ma
chine having a pair of dies with opposed threaded
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