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Патент USA US2410594

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Nov. 5, 1946.
2,410,594 -
Original Filed Aug. 3, 1939
5 Sheets-Sheet ‘1'
?’agnal W. ?ndrews?fq
‘guild Arthur Z‘Derly
Nov. 5, 1946.
Original Filed Aug. 3, 1939
5 Sheets-Sheet 2
l M Mrems, J:
7! Deil
Nov. 5, 1946.
Ofiginal Filed Aug,» 3, 1939
5 Sheets-Sheet 3
‘_ J ayna‘l WAndmmJr:
_and Arthur- 'IZIDeH
Nov. 5, 1946.
Originél Filed Aug. 3, 1939
5 Sheets-Sheet 4
--1 .
1... , a
qymzl MAndrews, J):
and Arfhur TDeily
Nov. 5, 1946.
Original Filed Aug. 3, 1939
5 Sheets-Sheet 5
Patented Nov. 5, 1946
Raynal W. Andrews, (in, New Kensington, and _
Arthur ,T. Deily, Pittsburgh, Pa., assignors t0
Aluminum Company ‘of America,v Pittsburgh,
Pa., a'eorporation of Pennsylvania
Original application August 3, 1939, Serial No.
288,163, now Patent No. 2,331,953, dated Octo- _
ber 19, 1943. Divided and this application .1 une
21, 1940, Serial No. 341,696
8 Claims.
Serial No. 288,163, ?led August 3, 1939, for im
movements in Metal working apparatus, now
U. S. Patent No. 2,331,953, granted October 19,
_1943, and relates particularly to gripping jaw
construction and actuating linkages therefor in
a carriage for a_ metal drawing apparatus.
application, Serial No. 341,697, filed June 21, 1940,
for improvements in Metal drawing apparatus is
also a division of our above-mentioned appli
by the drawing carriage. The provision in a
drawing carriage of work-engaging jaws adapted
to engage such portions of the work-piece as
-may be located out of the axis of the draw, and
of jaw-actuating means adapted to this purpose.
The provision of a system or means capable of
accelerating and decelerating the drawing car-_
riage during its movement on return to the die
10 head after the. completion of a drawing cycle,
_ and the provision of such a system or means
This invention relates to apparatus for work
ing metal shapes. and more particularly to draw
benches for drawing tubular shapes, rods and the
like through a die.
for engagement therewith of the hook supported
This application is a division of our application
(Cl. 205-24)
capable of actuating said carriage without undue
These and further objects and advantages of
15 this invention, either singly or in combination,
are for purposes of convenience illustrated with
The usual draw bench for tube drawing com
respect to a speci?c mechanism which embodies
prises a supporting frame or frames upon which
all of the specific features of the invention. It
are mounted a die, a mandrel and bulb, a draw
wi‘l be understood, however. that these features
chain or the like, and a carriage having jaws for
gripping the work after it has been passed over 20 my be available for single use, or in any suitable
combination. to improve the operation of draw
the mandrel and bulb and inserted through the
benches or similar apparatus which do not in
die. The carriage must be moved to draw the
clude all of said features.
work through the die, and for this motion gen
In the drawings:
erally ergages with, and receives its drawing
force from. a draw chain or similar device.
It has been customary for draw chains to be
driven continuously and at constant speeds; and
it has further been customary for a carriage to
be engaged with the chain while it is in motion
at such constant speed, thus accelerating the 30
work almost instantaneously.
The jerking and shock of such rapid accelera
tion .of the work frequently causes breakage in
Fig. 1 is a partial plan view of the preferred
form of a mechanism embodying the features of
the invention. ard showing two mandrel rods the
die head, the drawing carriage, the draw chain,
two return chains, and the drawing section of a
draw bench generally;
Fig. 2 is an elevation of the apparatus shown
in Fig. 1 showing in more detail a mandrel-sup
porting member, the mandrel rods and bulbs, the .
die head, the drawing carriage, and drawing sec
the work and results in waste of material and loss
of useful production time. A further cause of 35 tion of the draw bench ‘generally;
Fig. 3 is a side elevation. to an enlarged scale,
breakage, waste. and poor work has been the fact
that the grippingjaws of the drawing carriages
of prior apparatus have not been designed to
of the drawing carriage shown in‘ Fig. 2, in which
the work-engaging jaws of the drawing carriage
engage the work at points other than along the
are in a closed position and the draw chain‘en
out of alignment with their normal axes.
of the jaw-actuating crank, jaw-actuating levers,
axis of the draw, and work-pieces pointed for 40 gaging hook is in a lowered position, in its ?rst
engagement with the draw, chain;
engagement by the jaws often have pointed ends
Fig. 4 is a fragmentary view. partly in section,
which are bent off center or otherwise disposed
and associated part-s, taken along the line IV-IV
prove the drawing devices of the prior art to 45 of Fig. 3, the crank and levers being rotated into
vertical position for simplicity of illustration;
produce draw benches _or similar apparatus in
Fig. 5 is a side elevation of the drawing car
which the drawing (operation may be performed
riage, similar to and to the same scale as Fig. 3,
with less loss of useful production time and less
in which the work-engaging jaw shown is in a
wastage of material than is now usually obtained.
Speci?cally, this-general object is obtained, in 50 closed position, but in which the ‘draw chain en-.
gaging hook is in a raised position assumed dur
whole or in part, by'the realization, singly or in
ing a drawing action;_v this ?gure is partially sec
combination, of the following more speci?c ob
tioned to show the latching arrangement on the
‘jects: The provision in a draw bench of a vari
jaw-actuating crank; one work-engaging jaw
may be stopped
able speed draw
or slowed perceptibly, a" the jaws clamp the work,’ 65 and linkage therefor is removed for clarity of il
The general object of this invention is to im
lustration, and a serrated jaw insert is shown in
nuts l4, preferably tapered outwardly to facili
the Jaw illustrated;
tate passing‘ of tubular and hollow-shaped stock
Fig. 6 is a side elevation of the drawing car
riage, similar to and to the same scale as Figs. .
Means not necessarily forming part of this in
3 and 5, in which the draw chain engaging hook 5 vention may be provided for placing a work~
is in a raised position, but in which the work
piece on the mandrel when it is in the position
engaging jaws are in a retracted or open posi
of mandrel I2. Means may be provided for ro
tion as assumed on the return movement of the
tating the mandrel rods ,to bring the mandrel rod
carriage toward the die head; and
and work~piece from the position of mandrel rod
Fig. '7 is a plan view of the drawing carriage 10 Ii to the lateral position of mandrel rod l0; and
shown in Figs. 3, 5, and 6, and to the same en
means may be provided for advancing a mandrel
larged scale, in which one-half is a section taken
rod and its work-piece to the die to occupy the
as indicated by the reference'line VII—-VII of
position of mandrel rod I 0, bulb II, and tubular
Fig. 4.
work-piece 8, as shown.
Briefly, the apparatus as shown‘ comprises a 15
Means are provided for protecting andsup~
draw bench frame, a drawing head or carriage,
porting a work-piece passed over a mandrel rod
a drawing die, and two work supporting man
and bulb. These means preferably take the form
drels. A hollow shape may be passed over one
of tubular shells l6 supported at convenient in
mandrel within a protecting shell or other guid
tervals along their length by mandrel supports
ing support‘ by hand or by suitable mechanical 20 24 (one of which is shown to best advantage in
loading mechanism. (not shown); the mandrels
Fig. 2) comprising bases 25 attached to founda
may be rotated to align one work-piece and
‘ tion 2. Adjacent die head 3 suitable bell
mandrel with the die; the point of the work
mouthed guide bushings l8 are mounted within
piece may be inserted through the die; and the
end portions of shells 16 to facilitate the'entry
mandrel and work-piece may be forced into reg 25 of a hollow shape over a mandrel rod and within
’ istry with the die conjunctive with the beginning
the protective and supporting shell. Locking
of the drawing-action. The drawing carriage
bands 20, adapted to compress tubular shells IS
"and its Work gripping jaws may be actuated to
on bushings 18, may be readily loosened for in
. clamp the point of the hollow-shaped work-piece,
terchange of bushings of various size depending
and may be moved along the draw bench by suit 30 on the size of tube drawn. With respect to
able engagement with a draw chain to draw the
the mandrel rod, bulb, and hollow-shaped work
work-piece through the die. Upon completion of
piece, each guide bushing is arranged to par
a draw, the work-piece may be released to a con~
tially support the work-piece at a point adjacent
venientrack or removal'apparatus (not shown).
the die head when the bulb is forced into registry
Endless return means are provided for auto
with the die by means of the mandrel rod. Ad
matically traversing the drawing carriage back
ditional guide bushings 22 are located at suitable
to the die head after completion of a drawing op
intervals within the shells i6 and provide fur
eration. ‘ Such endless return means ‘are pref
ther points of support for the work-piece.
erably operable independently of the drawing
Tu- \
bular shells I6 are designed to protectthe work
chain and preferably are adapted to control the
against scratching and dirt and, with bushings
position and rate of speed of the drawing car~
i8 and 22, to support work of considerable length.
riage during its return movement.
Where protection of the work from dirt is not
a primary problem, the shellsv l6 may take the
Die section
form of spaced sections or rings rather than con
The die section of the draw bench will now be 45 tinuous lengths of tubing as shown.
described with special reference to Figs. 1 and
Drawing section
2 of the drawings. By the die section is meant
that portion of the apparatus immediately adja
Referring to Figs. 1, 2, 3, 4, and '7, the drawing
cent, or associated with. the drawing die. A main '
section of the draw bench is now described. This
frame I is secured on foundation 2; and at one 50 section of the bench is de?ned as that portion
end of the main frame (to the left as viewed in
of the bench, including the associated apparatus,
Figs. 1 and 2)_ is mounted a removable die head
over which the stock is pulled or drawn from the
3, incorporating drawing die 4, die retaining block
die 4. The drawing section comprises generally
5, and retaining pin 6. The die 4 is removably
frame I, draw head 30, and ‘tracks or rails 31 along
mounted to facilitate change or replacement of 55which the carriage may move on carriage wheels
dies to take care of different sizes and shapes
32, Gripping jaws 33 and 34 are located in draw
of material to be drawn. The die head 3 may be
head 30 and are ‘adapted to engage the pointed
removed from the frame by engagement of a
end 9 of the tubular work-piece ~8. Carriage hook
crane hook with an eye-bolt ‘l. The die head may
35 is adapted to engage endless draw chain 36.
be suitably shimmed for alignment about the B0 A pair of suitable return chains or other endless
axis of draw in one or more planes, or a tilting
driving means 31 and 38 are connected to carriage
die head, adjustable about either vertical or hor
30 on either side thereof and adapted to return
izontal axes, can be employed if desired.
the carriage to die head 3 upon completion of a
‘The work-piece, here a tube 8, is shown with
drawing operation.
its pointed end 9 inserted through die 4. As 65 Means are provided upon carriage 30, here in
shown in, the sectioned portion of Fig.2, the
the form of trip arm 39, for actuating a plurality
drawing operationhas not started, and, there
fore, mandrel rod l0 and bulb H are not shown
in full registry with die 4. A second mandrel rod
of limit switches 4|], 4|, 42, 43, 44; and 45, which
‘are located along the main frame I, as shown.
These limit switches are arranged to control ac
l2 and bulb l3 are located above and behind 70 celeration and deceleration of drawing carriage
mandrel rod l0 and bulb ll. Said second man
30 during its forward drawing and return move
drel rod and bulb are shown in a fully, retracted
ments, and further to control-various other opera
position, adapted to receive an undrawn work
tions to be hereinafter described.
piece. Bulbs II and I3, are secured to mandrel
Draw chain 36 is centrally located within
- rods l0 and I2. respectively, by suitable threaded 75 frame I and is supported over drive sprocket 46
in» the description are the two chain releasing
cams 69 and ‘it. As aforementioned, the carriage
all is positively connected to the draw chain at
by a hook 35 carried. by the carriage. Fixed upon
the shaft which supports hook 35 is a hook release
lever ‘H (Figs. 1 and 7), which is mounted in a
ind idler sprocket ill. Drive sprocket 66 is prefer
ibly driven by either one or both‘ of two motors
preferably hydraulic, but not shown) connected
to a drive coupling 68 at the extreme forward
and of the bench (to the right as viewed in Figs.
l and 2), which drive coupling 48 is connected
substantially horizontal position and extends for
1c the draw chain drive sprocket 46 through a
ward of the drawing carriage on one side thereof.
irive shaft 69 held in frame I by bearings 50
On the extremity of release lever ‘ii is a .cam
ind 5!. The draw chain may be lubricated by
:ontinuous immersion in a suitable oil reservoir 10 follower in the form of a roller ‘I2, adapted to
engage and ride up the contour of cam 89 \(Fig. 2) ,
located in the path of the under portion of the
located adjacent the die head of the drawing sec
:hain, but not here shown. The idler sprocket
tion of the draw bench, or of stop cam ‘it located
i1 is located adjacent the die end of frame I
at the other extremity of the draw bench. At
and is mounted on an idle shaft 52 journailed
either cam the action of release lever ‘H and its
ln adjustable bearings 53. These bearings may
roller 12 is to lift hook 315 out of engagement with
be moved longitudinally of the drawbench by
means of nuts 56 on screw threaded rods 55, for
drawing chain 3t, thereby bringing carriage 3b
adjustment of the draw chain tension or for re
to rest.
Cam 69 is provided for the purpose of releasing
The draw chain 36 has preferably a short pitch, 20 the carriage hook from the draw chain when the
carriage jaws have failed to engage the work
that is, the links are made as short as possible -
moval of the draw chain.
piece or in case .of breakage of the work-piece
so that variation in linear velocity of the chain
will be kept at a minimum; and the drive motors
during forward travel of carriage 3b. In either
for thedrawing chain preferably have rigid speed
event, there is no drawing tension on the chain.
control so as to produce as nearly constant draw
ing velocities as are feasible. By means of this
If the carriage 30 has engaged work-piece 8.
through the proper clamping engagement of jaws
preferred form of apparatus, the drawing speed
. 33 and 3d, upon the work, the drawing tension
exerted on draw chain 35 will lift the chain and
the‘engaging carriage hook 35 suihciently high
mal speed, under no load up to heavy drawing
load, with rapid and even acceleration, initiated 30 to permit hook release lever ‘H and roller 12 to
clear the cam 69. Thus the normal drawing op
by electrical control ‘ operable through limit
eration will continue until the work-piece is free
switch 43.
of drawing die d. At this point, drawing tension
Return chains 31 and 38 are ?xed to carriage
is immediately released and the draw chain tends '
30, through tie plates 56, and are supported and
located on either side of frame I, being engaged 35. to fall and disengage itself from the book 35.
Cam 70 functions as a safety device and hook
by drive sprockets 51 adjacent the die end of said
adjusting mechanism in the event that hook 35
frame and by idle sprockets 58 at the opposite
does not, at the end of the drawing operation
end of said frame. Drive sprockets 51 are mount
and when drawing tension is’ released, release it
ed on a common drive shaft 59, ‘which carries
belt pulley cr sprocket 60, and is journalled in 40 self from the chain but falls therewith. In such
case, the release lever ‘H and its cam follower ‘l2
suitable bearings St. The drive shaft. and
contact cam ‘m, with the result that the hook 3%
sprockets are driven by electric motor 62 through
is positively raised and disengaged from the
drive belt or endless chain 63 and belt pulley or.
chain 38, and reset in its raised position, thus
sprocket 6G. The return chain idle sprockets 58
are-located oncommon idle shaft 66 journalled 4 preventing the continuously traveling chain 36
from dragging the draw head 3t off the end of
in adjustable bearings 65. Means for adjusting
the bench, or preventing other injury to the as- ‘
the tension of return chains and for permitting
their ready removal are here provided in the form
of threaded rods 66 and adjusting nuts 67 pro
Draw head
may be varied from practically a stop up to nor
vided thereon.
Return chains 31 and 38 are 50
recessed in chain guards 6B for protection of both
chains and operator. Suitable means may be
provided for lubricating such chains where de- ~
With reference especially to Figs. 3 through 7,
the draw head or carriage it will now be particu
larly- described. In the carriage are the afore
The electric motor 62 operating said return 55 mentioned slidable work-engaging jaws 33 and
36 having suitable gripping inserts therein, as
chains is preferably adapted to be used as an
seen in Figs. v5 and 7, and which are adapted to
electric brakeuupon the draw carriage 30 as it
grip the work-piece at the die head 3. These jaws
approaches the die head 3. In this way the move
ment of the carriage on its return to the die head
is positively controlled, thus eliminating the
necessity for employing previously used shock
absorbers or cushioning devices to stop the car
riage at the die head. The ‘two return chainsv
31, 38 are preferably provided to insure alignment
of the drawing carriage with the die head upon
its approach thereto, but a single chain or cable
may be used with satisfactory results. The ac
celeration and deceleration of the drawing car
riage 30 on its return travel may be accurately
. are so arranged that one jaw may advance or ad
just itselfrelative to the other, and relative to
the work-piece to grip the pointed end 9 thereof '
> and exert an axial drawing force thereon despite
any irregular formation or non-axial alignment
'of said work-piece end. Further it may be noted
that the jaws are actuated through a linkage,
which will be described hereinafter, by means of
the forces exerted by the draw chain 38 on the
chain engaging hook 35.
For purposes of clarity in describing the jaw
controlled through one or more of the aforemen 70 actuating mechanism and linkage, the carriage
30 and its associated elements have‘been illus
tioned limit switches, as here shown by switches
trated in detail to an enlarged scale in Figs. 3, 5,
40, M, and 42, which switches are actuated by
and 6, these views of the carriage having been.
the drawing carriage trip arm 39.
..taken on the same side of the assembled machine
Other elements of the drawing'sectionof vthe
draw'bench which should be noted at this point 75 as that illustrated in Fig. 2. Figs. 4 and 'l are
supplementary to Figs. 3, 5, and 6 and should be
considered therewith.
The carriage or draw head 30 is provided with
a. transverse shaft 15 journalled in the frame
thereof. Centrally on said shaft is keyed the
clevised end (see-,Fig. 7) of carriage book 35. This
hook has a link-engaging portion 15 which is ar
cuate in form (see Fig. 2) to conform with a link
portions or seats 93, substantially semi-cylindri
cal in form. On the upper extremities of jaw
actuating levers 88, 81 on either side, and in the
directions of oscillation thereof, are similar re
cessed, concave bearing portions 94, substantially
semi-cylindrical in form and adapted to lateral
alignment with the corresponding bearing por
tions 93 on crank 82. Crank 82, at the level of
_ of the draw chain, ‘the said arcuate portion be
recessed bearing portions 93, has an aperture 95
ing preferably adapted to engage somewhat more 10 extending therethrough in a direction substan
than 90° of are on any particular link. Also keyed
to shaft 15, at one end thereof, and located out
side the frame of carriage 38, is the hook release
lever ‘II and its cam contacting roller 12. The
tially tangential to the arc of rotation thereof.
Extending through aperture 95, in approximately
the same‘plane as contains the quadric-crank
linkage and normally perpendicular to crank 82,
keyed‘angular relationship of ‘book 35 and hook 15 is adjustable tie-bolt 96 threaded at either end,
release lever ‘H on through shaft 15 is such that
to receive adjusting nuts 91. Mounted preferably
when, lever ‘H is in its lower position, its roller
on the forward end of the tie-bolt 96, in the
12 would engage cam 69 or stop cam ‘I0, on ap
direction of draw, is bearing member 98 engag
ing crank 82 and jaw-actuating levers 8B, 81 in
hook 35.
20 the aforedescribed bearing portions 93 and 94,
Also keyed to shaft 15 between forked portions
respectively. The said bearing member 98, which
proach thereto, and rise thereon, thereby raising
of the clevised end of hook 35 is a crank lever l7
is axially slidable on tie-bolt 96 and positionable
extending in a generally vertical direction above
thereon by means of nuts 97, extends laterally
top plate ‘I8 of carriage 38, said hook 35 and crank
across crank 82 and across the jaw-actuating
lever 11 substantially forming a. bell crank oscil 25 levers 86, 81, and is adapted to engage with either
latable with said shaft 15, in accordance with the
of said jaw-actuating levers or said crank inde
forces imparted to the hook by means of the draw
pendently, or at times with all of them simulta
chain 36, or to the hook release lever ‘II by means
neously. For engaging the opposite bearing por
of the cams 69 or 18.
tion of crank 82, or the opposite'bearing portions
Disposed laterally and approximately central 30 in jaw-actuating levers 86, 81, is a second bearing
ly of carriage 38, above top plate .18, is pin ‘I9
member 99 similarly mounted on said tie-bolt 96.
supported and retained in bearing blocks 88, 8!.
The two bearing members 98 and 99 are provided
Oscillatable on pin 19 is a centrally disposed crank
with semi-cylindrical or convex bearing surfaces
82 which extends upwardly therefrom in a gen
adapted to engage in the aforesaid semi-cy'indri
erally vertical direction. Adjustable link 83 con 35 cal or concave bearing recesses of the crank and
nects the upper extremities of crank 82 to crank
lever 11, whereby crank lever 11, adjustable ‘link
the levers.
The bearing member 98, slidable on tie-bolt 96,
'83, and crank arm 82 form, with the frame of the
serves further as a spring seat for double-acting.
carriage, a quadric-crank-linkage.
spring 88, which spring is mounted surrounding
Preferably integrally formed with the lower 40 the said tie-bolt 96 on that portion of the tie-bolt
portion of crank 82 is a projection forming a latch
which extends, to the left as viewed in Figs. 3, 5,
84 adapted to be engaged by pawl 85, whereby the
and 6, toward the jaw portion of the draw head
quadric-crank linkage actuated by hook 35 or
38. An opposingspring seat I00 is located at the
release lever 1| may be latched with the hook in
end of tie-bolt 96 and is slidable thereon, being
‘ its raised position in a manner which will be
adjustable for position by means of adjusting
more fully described hereinafter.
nuts 91.
' Also oscillatably mounted on pin 19, on either
side of crank 82, are jaw-actuating levers 86 and
31, which levers have portions extending in a gen
Levers 86, 81 and crank 82 are cooperatively re- '
lated by means of the aforementioned double
acting spring. tie-bolt, spring seats, and bearing
erally vertical direction above pin 19 in normally 50 members. The‘ two~fold purpose of the spring
parallel relationship with crank arm 82, and jaw
and associated elements is, brie?m (1) to tend to
actuating portions extending below pin 19 to act
keep levers and crank in the same axial line so
as lever arms. Jaw-actuating levers 86. and 81
are independently oscillatable on pin 19 and are
that they may function substantially as one split
lever oscillatable on the pin- 19, and yet permit
inter-related'in their action by a double-acting 65 the levers to advance or retract relative to each
spring 88 and associated parts. At the lower ex
other in response to movement of the crank. and
tremities of said jaw-actuating levers are adjust
in response to the relative positions assumed by
able links 89 and 90 connecting to work-engaging
the work-engaging jaws as they positively and
jaws 33 and 34. respectively. Said jaws are slid
separately engage the work; and (2) to store jaw
able on converging ways 9t (see Fig. '7). The lat 60 opening energy by compression in the spring '
terly described portion of the actuating linkage
for each jaw may be referred to as a slider-crank
linkage, said linkage comprising a jaw-actuating
~ whereby the spring may effectuate movement of
the levers to assist in the opening of ‘the jaws, as
will hereinafter be specifically explained._ Ad
lever, an adjustable link, and a jaw slidable on a
justabilities afforded in the various links, and
converging way.
65 the yieldability of the ‘spring permit ready ac
To provide for vconvergence of the jaws, and for
commodation of the apparatus to Work-of vary
the angular movement of adjustable links 89, 98
ing size and shape.
with respect to levers 86, 81 and the jaws 33, 34.
For engaging the aforementioned latch ‘84, the
suitable ball-and-socket connections 92 have been
pawl 85 is pivotally mounted on pin IOI, ?tted in‘
provided between each of‘ said levers and each 70 suitable bearings “)2 located in the base of car
of said adjustable links and between each of said
riage or draw head 30. A spring I03 connects
links and each of said jaws. .
pawl 85 and an anchoring pin I04, and tends to
Approximately central of the length of the
hold the pawl against either latch 84 (Fig. 3). or
crank 82 on either side, and in the directions of
the base of crank 82 under the said latch (Figs. 5 , '1
oscillation thereof, are recessed, concave bearing 75 and 6). For moving said pawl from its latched
ing trip rod I05 is mounted in bearings its on
are opened partly by the action of spring 88, as
it tends to re-align levers 86, N with crank 82
top plate 18 of carriage 30. The said trip rod is
by forcing bearings 98, 99 toward each other, and
adjustable for length, as indicated in the draw
ing, and is so mounted upon the carriage as to
contact die head 3 as the carriage approaches
partly by the sudden release of the drawing ten
sion through disengagement of hook 35 from
said die head. Upon contacting die head3, trip
rod 105 moves against pawl 85, thereby unlatch
Consequent upon the release‘ ‘of drawing ten
sion by the passage of the work completely
7 ing crank 82 and allowing movement of the said
through die 4 is the release of tension upon the
position under latch 86, a longitudinally-extend
chain 36.
draw chain 36 which causesthe chain to slacken,
tend to fall to its idle position, and thus free it
The operation of the carriage will now be set
self from the link engaging portion 16 of the hook
forth. Upon movement of carriage 3G to die head
35. As the hook- 35 thus disengages from the
3, trip rod I05 contacts the die head, thus forcing
chain, carriage 30 comes to a stop. Thereafter,
pawl 85 from under latch M (Fig. 6) so that
hook 35 falls of its own weight in a clockwise 15 the work being removed, the carriage returns to
the die head, its‘elements being positioned with
direction to move the quadric-crank linkage to
respect'to each other as shown in Fig. 6.
- the position shown in Fig. 3. Movement of hook
35 to the position of Fig. 3, at which position it
Mamdrel section.v
engages draw chain 36, closes jaws 33 and 3,4 upon
the work by actuating the above-described slider
The preferred means of presenting work-pieces
crank linkages associated therewith. Because of
to die 3 will not be enlarged upon since they are
bearing members 98, 99 and spring 88. levers 86,
fully set forth in our original application, Serial
81 are caused to follow the movement of crank
No; 288,163, above-mentioned.
82, unless one or the other of the levers meets
Along the mandrel section of the bench, which
with other than frictional resistance, Upon the 25 is that portion of the bench located on the stock
engagement of one or the other of the jaws with
feeding side of the die head 3, are a plurality of
mandrel-supporting members 26.
the work, further movement of the lever associ
ated therewith is impeded, but the other jaw may
The mandrels are preferably mounted parallel
move separately a further distance until it like
with, and oscillatable orl rotatable about, an axis
wise engages the work. Thus, when both of the 30 located centrally'therebetween so that their pe
jaws have engaged the work, levers 86, 87 may be
ripheries ‘have a locus describing a, cylinder. It
slightly displaced with respect to each other, in
is obvious, however, that they may be 'mounted at
quadric-crank linkage to take place.~
which case spring 88 and tie-bolt 96 will have as
an angle to each other so that their peripheries‘
will have a locus describing a frustum of a, cone.
sumed a lateral position required by the align
ment of the bearing members 98, 99 with respect 35 This, or other,_alternate construction preferably
would be such that when a mandrel is presented
to levers .86, 81 and crank 82. The action of
to a ‘die, it would assume a position in axial align
spring 88 between seat I80 and bearing member
ment with the axis of draw. Alternate align
seat 99 tends to equalize the work-engaging forces
ment of the respective mandrels with the die has
tive adjustment of the lengths of links 83 and B9, 40 been provided for so that a tubular shape may‘
be drawn while registered with the die by one
90, greater or less amounts of compression may
mandrel rod and bulb,v while a new work-piece
be built up in spring 88; further the spring 88
' on the jaws 33 and 3d. _ Depending upon the rela
will also permit over travel of crank 82 with. re
spect to levers 8t and 87. depending upon the
relative length adjustment of said links. Ad
justing nuts 91 may be moved to predetermine
the maximum length of spring 88, i. e._to load the
same as desired.
_ _
At the start of a drawing operation the draw
ing force of chain 3% on hook 315 lifts both chain
may be threaded over the second mandrel rod
and bulb, in order to speed up the production '
of the draw bench. The mandrel-supporting
members 24 are provided to support the tubular
shells l6 and indirectly the mandrels, through
out their length, and for constraining the path ,
of rotation thereof.
causes it thus to move to a substantially horizon
Each mandrel-supporting member 243 com
prises essentially a frame base structure 25, on
which. are suitably journalled two supporting
rollers ldll adapted to support a disc-like block
HI, adapted to be rotated with its track portion
H2 bearing on said rollers. Tubular shells it
tal position, thus causing a, movement of the
are mounted through apertures in block iii.
andhook so that they assume a substantially
straight line position from the axis of carriage
shaft ‘it toward the tangent point on the chain
drive sprocket ‘it. The lifting force on ‘said hook
quadric-crank linkage from the position illus
trated in Fig. 3 to the position illustrated in Fig.
5. In this latter position, crank 82 has been
Assuming a tube on a. mandrel rod in the load
moved away from the levers 86 and 81, thus plac 60 ing position, the carriage 30 on the tracks 3! at
ing the spring 88 in compression following the
some distance from the die head 3, and the draw
separation of bearing members 98 and 99. The '
chain moving, such as would be the case follow
levers 86, 81 are not moved by this action since
ing completion of a, previous drawing operation,
the jaws 83 and 3d are retained. in contact with
a cycle of operations may be instituted by the
the work by the drawing tension. As crank 82 65 closing of a control switch (not shown) adapted
assumes the position shown in Fig. 5, spring we
to initially energize the return chain operating
pulls pawl 85 under latch 8%, thereby locking the
hook in its upward drawing position.
The position assumed by the carriage elements
motor 62.
Upon energization of the carriage return motor
62 movement of the carriage 30 toward the die
in Fig. 5 will be maintained throughout the 70 head 3 will begin. The limit switchdog 39 on
drawing operation until the work is completely
carriage 30 will ?rst strike the limit switch to
drawn. The freeing of the work from die A re
which, because of the previous closing of limit
leases the tension between the work and the jaws
switch 44, will cause means not shown to in
so that the jaws are no longer maintained in
their closed position by the work tension, and 75
dex the mandrels to present a tube opposite the
d e.
ll .
At a position along the main frame of the draw
bench nearer the die head 3, the limit switch dog
39 on the carriage '30 engages and operates limit
' switch 40.
Upon the movement of limit switch
43, the ?eld control of the return drive motor 62
is, in the operation here described, modi?ed to
bring the return speed of the carriage to a sub
stantially constanttbase value.
of spring 88 aforedescribed will also tend to open
the same.
The limit switch dog 39 on the carriage 30 will
?rst actuate and engage limit switch 42, re
setting the same and electrically disconnecting
from circuit the return drive motor 62 so that
the return chains 31 and 38, ?xedly connected to
the carriage, may cause reverse rotation of the
At a position along the main frame of the draw
drive motor 52 against no electromagnetic forces.
bench still nearer thedie head, the said limit
The limit switch dog 39 will next reset the limit
switch dog 39 engages and operates limit switch
switch 43 and cause acceleration of the drive
44. Upon the movement of limit switch 44, means
chain 36 from its initial slow speed to normal
not shown are adapted to push the mandrel into
drawing speed.
the die. At this position the pointed end 9 of
The next limit switch 4| will be merely reset
the tube extends through die 4 for. engagement by 15' without effect upon the cycle of operations‘.
the jaws 33 and 34 of the drawing carriage 30.
Likewise the next limit switch‘ 44 will be reset,
Upon further approach of the carriage 30 to
_ to its ?rst position, causing means not shown to
the die head the limit switch dog 39 strikes and
‘become operative for tending to withdraw a man
actuates successive limit switches 4l,.43, and 42,
drel rod, e. g, H), and bulb, e. g. H, from registry
which in that order respectively decrease the 20 with die 4. This tendency, however, will remain
speed of the return drive motor 62 by armature
ineffective while there is drawing tension on a
shunt control, decrease the speed of the draw
tube 8, but will be adapted to withdraw the man
chain 35 to a pre-set initial drawing speed, and
drel rod and bulb'upon completion of the drawing
stop the motion of the drawing carriage as it ap
proaches the die head by applying dynamic brak~ 25 The next limit switch 40 will be merely reset
ing through the drive motor 32.
without effect upon the cycle of operation.
As carriage 30 comes to rest at die head 3, trip
The ?nal limit switch 45 will be reset to‘ an
rod I05 contacts the die head and releases pawl
ineffective position without affecting the cycle of
- 85 from under latch 84, whereupon hook 35 falls
operations, whereupon the electric and pneumatic
into and engages its arcuate portion '16 with a 30 control system will be then in condition for oper
link of chain '36. The falling motion of the hook
ation as described at the beginning of this draw
35 imparts a closing movement to the jaws 33, ' ing cycle.
34 as described above, whereupon the jaws engage
After passing these limit switches, preferably
and grip the pointed end 9 of a properly posi
located within a distance from the die head cor
tioned tube 8.
responding to the minimum length of tube to be
The draw chain 36 may be moving at a slow
handled, the carriage‘ 30 will continue to be drawn
speed or stopped as controlled by the limit switch
out along tracks 3| on main frame I by draw
43. If stopped the draw chain would then be
chain 35 until tube 8 is drawn completely through
started by a manually actuated switch or other
die 4. When tube 8 makes its exit from die 4,
device (not shown). Assuming that it is moving 40 there will be an immediate release of drawing
at a slow speed as here provided, immediately
tension throughout the draw bench; and the re
upon the engagement of the hook 35 with the
coiling effect of the tube 8 in connection with the
draw chain, the carriage 30 begins its travel away
stored energy in the spring 83 will immediately
from the die head and the drawing of the tube
open the jaws 33 and 34 of carriage 30, whereupon
begins. Drawing tension through the chain, 45 the tube 8 will be released and allowed to fall
hook’, carriage, jaws, tube, mandrel rod bulb, and
onto any suitable unloading devices arranged
mandrel rocl raises the hook 35 to its normal posi
therebeneath (not shown). At the same time the
tion, where crank 82 is latched by pawl 85, clamps
the jaws 33 and 34 upon the pointed end 9 of
‘ release of tension in the 'draw chain 36 will per
mit the chain to fall from engagement with the
the tube 8, and brings the mandrel rod bulb ll
hook 35 and, the carriage will come to rest. . Also
into ?nal registry with the die 4.
the pressure of air against the piston in the ma
nipulating mechanism will then be effective to
Before continuing with the description of the
operation, it- may be pointed out that if ‘the jaws
should fail to engage the end of the tube there
will be no tension on the chain 36 and the hook
35 will not be substantially raised. Rather than
permit the carriage 30 to travel out the full length
of the frame, means for stopping the carriage and
returning it again to the die head are provided.
move the mandrel rod and» bulb out of registry
with die 4 and to retract the same into and with
in its protective tubular shell I6.
It will also be apparent from the foregoing
description that, this apparatus is adapted to
the drawing of rods and bars not necessitating
the use of mandrel rods and bulbs, upon the
The roller follower 12 of hook release lever ‘H 60 provision of a push rod in place of each mandrel
rod, which push rod would be adapted to ad
will strike the cam 69, which will raise the hook
vance the work into registry with the die. Also,
, release lever and will release the hook from the
in a similar modi?cation a ?xed mandrel could
chain, whereupon the carriage 30 may have a
be employed for drawing substantially hollow
short return travel back to the die head to re
65 shapes.
engage tube 8.
It should be understood that many of the
Assuming, however, that the jaws have engaged ‘ auxiliary devices with which this draw bench
the end of the tube upon the falling of hook 35
has been described are not essential to its use
into the draw chain, the motion of the carriage
ful operation, and that many other combina
outward under drawing tension will continue as 70 tions and relations of the parts and associated
?rst described. The hook will be raised and
devices may be employed without departing from
latched by the tension on the chain, but the jaws
the nature and scope of this invention as de?ned
will remain closed underthe force exerted by the
in the appended claims.
work tending to draw them into tighter engage
What is claimed is:
ment therewith despite the fact that compression 75 1. In a draw headv for operation in a mecha
nism of the class described, a mechanism for V and a single spring means inter-connecting said
‘actuating a work gripping jaw comprising a r linkage means and said levers, said linkage means,
' shaft, a, crank freely oscillatable on said shaft,
spring means and levers being adapted, 0n move
a‘lever freely oscillatable on said shaft and hav
ing an end operatively connected to a movable
work gripping jaw, and resilient means asso
ment of said attaching means, to simultaneously
move all of said jaw members toward the work,
and said linkage and spring means being adapted
ciated with said lever and said crank for resist
to thereafter independently move any said lever
ing relative rotation therebetween in eithervdi
and its jaw member after any other said jaw
rection and adapted to correlate their oscillation
member has positivelyengaged the work.
on said shaft, said resilientj means including 10
5. In a draw head for operation in a mecha
members adapted to engage said lever and said
nism of the class described, a mechanism for
crank, whereby relative angular disposition of _ actuating the work gripping jaws comprising a
the crank and lever is adapted to strain said
shaft, a crank oscillatable onsaid shaft, levers
resilient means.
oscillatable on said shaft, each having an end
2. In a work-engaging drawing carriage, a
connected to a movable work gripping jaw, and
pair of work-engaging jaw members, a mecha
resilient means associated with said- levers and
nism adapted to actuate said jaw members com
- said crank for resisting relative rotation there—
prising an oscillatable crank adapted to form
between in either direction and adapted to cor
a crank link of.a quadric-cranklmechanism, two
relate theiroscillation on said shaft, said resilient
oscillatable levers normally parallel with said 20 means including members adapted to engage said
levers and said crank, whereby relative angular '
crank‘ located on either side thereof, said levers
disposition of the crank and levers is adapted to
adapted to operate as cranks for a pair of slider- ,
strain said resilient means.
crank mechanisms in which said work-engaging
.6. In a work-engaging drawing carriage, a
jaws form slider elements, each of said levers
and said crank having portions on either face 25 plurality of work-engaging jaw members, a mech
thereof substantially equally spaced radially - anism adapted to actuate said jaw members com
prising an oscillatable crank, a plurality of oscil-_
from a common axis of rotation con?gurated
latable levers normally aligned with’ said crank
to receive seating members, a pair of seating
and adapted to operate said work-engaging jaws,
members themselves con?gurated to conform to
said con?gurated bearing portions, and an ad 30 each of said levers and said crank having por
tions on opposite faces thereof con?gurated to
justable spring unit for correlating said levers
and crank comprising the said "two seating mem
receive seating members’, a plurality of seating
members, an adjustable spring unit comprising
bers abutting either face of said levers and crank,
the said seating members for pressing opposed
each of saidseating members being adapted to -_
seat on at least one of said levers or on said 35 seating members toward each other, whereby the
levers may be‘ angularly disposed with respect to
crank at .all times, an adjustable tie-rod con
the crank while straining the spring unit, and
necting said seating members, and a spring mem
whereby the levers may be slightly angularly
ber interposed between one of said seating mem
disposed with respect to each other to permit
bers and an end of said tie-rod external to said
levers and crank, whereby said levers may be 40 relative adjustment of the work-engaging jaws.
angularly disposed with respect to said crank
7. In a mechanism of the character described,
a drawing carriage having two work-engaging
in either direction while straining said spring
jaws, each of said work-engaging jaws having
and whereby said levers may be slightly angu
connected thereto a jaw-actuating linkage form
larly disposed with respect to each other to per
mit relative adjustment of the work-engaging 45 ing with the same a slider-crank linkage, means
jaws with a work-piece.
3. In a mechanism of the character described,
a drawing carriage having two work-engaging
for attaching said carriage to a drawing member,
said attaching means having connected thereto
a linkage forming a quadric-crank, jaw-actuating
mechanism adapted to operate each of said slider- .
jaws, each of said work-engaging jaws having
connected thereto a jaw-actuating linkage, each 5o crank linkages, a crank of saidquadric-crank
mechanism and cranks of said slider-crank link
Jaw-actuating linkage and connected jaw being‘
ages being inter-related ‘by spring means adapted
adapted to operate as a slider-crank linkage, a
to resist relative angular disposition of one of
single quadric-crank jaw-actuating mechanism
.adapted to operate each of said slider-crank‘ - said cranks from another.
linkages, a crank of said quadrlc-crank mech- '55 8. In a mechanism of the character described,
a drawing carriage having two work-engaging
anism and cranks of said slider-crank linkages
Jaws, each of said work-engaging jaws having
being oscillatable about a common axis, said
connected thereto a jaw-actuating linkage form
cranks being related by means of seating mem
bers engaging-opposite sides thereof arid a tie
bolt carrying an adjustable spring, and means
ing with the same a slider-crank linkage, and a
for latching said quadric-crank mechanism, inv
erate each of said slider-crank linkages, a crank
of said quadric-crank mechanism and cranks of
a desired position.
single quadric-crank mechanism adapted to op?
said slider-crank linkages being oscillatable about
4. In a draw head for operation in a mecha
nism of the class described, attaching means for
the common axis, said cranks being related by
positively engaging said head with a drawing 65 means of seating members engaging opposite
member, sliding jaw members adapted to‘ engage
sides thereof, and a tie bolt carrying an adjust
'able spring.
the work to be drawn, an operating lever for each
‘ of said jaw members, linkage means actuated by
said attaching means for operating said levers, '
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