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Патент USA US2104993

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Jan. 11, 1938.v
2,104,993
c. J. HOLUB
APPARATUS FOR FORMING SHEET METAL ELBOWS
Filed 0G13. 17, 1936
6 Shee‘LS-Shee‘l. l
Jan. 11; 1938.
2,104,993
ç. J. HOLUB
APÍI’ARATUS FOR FORMIÑG SHEET METAL ELBOWS
Filed Oct. 1'7, 1936
6 Sheets-Sheet 2
Jan. 11,1938.
2,104,993
Cl _1_ HOLUB
APPARATUS FOR FORMING SHEET METAL ELBOWS _
Filed Oct. 17, 1_936
6 Sheets-Sheet 5
INVENTOR
/67 ¿à
Jan. l1, 1938.
2,104,993
c. J. HOLUB
APPARATUS vFOR FORMING SHEET METAL ELBOWS
Filed Oct. 17, 1936
6 Sheets-Sheet 4
N
9%
MW
INVENTOR
Jan. 1l, 1938.
2,104,993
c. J. HoLUB ‘
APPARATUS FOR FORMINGV SHEET METALy -ELBOWS
-Filed oct. _17, 1936
6 Sheets-Sheet 5
N
«In
Jan. 11, 1938.
Y
2,104,993
c. J. HoLUB
lAPPAÄÃRATUS FOR FORMING SHEET METÀL EILBOWS>
Fíle'd Oct. 1'7, 1936
l 6 Sheets-Sheet 6
INVENTOR
Patented Jan. 11, 1938
¿£04,993
UNITED STATES PA'ÉENT @FFÉQE
2,104,993
APPARATUS FOR FORD/.UNG SHEET METAL
ELBO WS
Charles J. Holub, Columbus, Ohio, assignor to
‘Wheeling Steel Corporation, Wheeling, W. Va.,
a corporation of Delaware
Application October 17, 1936, Serial N0. 106,206
3 Claims.
This invention relates to a method and appa
ratus for making sheet metal elbows and, in
particular, stove pipe elbows.
Devices of this general character have been
known before, and examples thereof are de
scribed and claimed in my prior Patents Nos.
1,517,678 and 1,553,817. The object of this in
vention is to improve upon the constructions
disclosed in Ysaid patents, particularly in respect
of certain automatic operations such as the
clamping of the blank or workpiece in position
to be operated upon, and the means applying a
brake to arrest operation of the device at in
tervals.
The improvements in details of construction
comprising the present invention are illustrated
in the accompanying drawings, and will be com
pletely described hereinafter.
In the drawings,
Fig. 1 is a side elevation;
Fig. 2 is an end view looking from the left in
Fig. 1;
Fig. 2A is an elevation of a detail;
Fig. 3 is a view partly in elevation and partly
in section along the line III-III of Fig. 1;
Fig. 4 is a central longitudinal section taken
through the axis of a mandrel on which the
workpiece is disposed for corrugating and bend
ing operations;
Fig. 5 is a sectional View through the man
drel taken along the line V--V of Fig. 4;
Fig. G'is a side elevation of the parts shown
in Fig. 5, looking from the' left in the latter;
Fig. ’7 is a partial plan view of a clamping car
riage movable on the mandrel which is also
shown in Figs. 5 and 6;
Fig. 8 is a view partly in elevation and partly
in section along the line VIII-VIII of Fig. 5;
Fig. 9 is a partial sectional view along the line
40 VIII-VIII of Fig. 5 but looking in the direction
opposite that of the arrows;
Fig. 10 is a partial section along the line X-X
of Fig. 5;
Fig. 1l is a View partly in elevation and partly
45 in section along the line XI-XI of Fig. 3;
Fig. 12 is a view partly in plan and partly in
section along the line XII-XII of Fig. 3;
Fig. 13 is a partial sectional View along the
line XïII-XEII of Fig. l2;
50,
`
Fig. 14 is an end elevation of a bending ring
or head adapted to be placed over the end of the
blank to receive the bending force applied there
to; and
55.
Fig. 15 is a plan View of a detail.
Referring now in detail to the drawings, the
(Cl. 15S-69.5)
apparatus comprises essentially a supporting bed
or frame I and a mandrel 2 carried thereby on
a frame plate 3, the mandrel projecting toward
and through an opposed frame plate 4. A car
riage 5 slidable on the mandrel 2 and a bending
ring 6 cooperate to support a tubular blank 'I
therebetween. The carriage 5 is fed forward
along the mandrel 2 in a step by step fashion
by a ratchet bar 8. segmental corrugating dies
9 having overlapping ends intermittently form
circumferential grooves or corrugations in the
blank, and the forward end of the latter is bent
‘upwardly by engagement of bending arms IIJ
with the bending ring S. All the parts are oper
ated by a common drive II including a clutch
I2 and brake I3. Each of these parts will be
described in detail under appropriate sub-titles.
The bed and frame
The bed I may conveniently be composed of
a suitable casting mounted on supporting legs I4.
'I‘he frame plate 3 is mounted vertically thereon
approximately midway between the ends there
of. The plate ¿l is similarly mounted adjacent
one end of the bed. Spacer rods 3a. extend be 25
tween the plates 3 and 4 adjacent their upper
ends. A driveshaft I5 is journaled in a bearing
I6 mounted at the end of the bed opposite that
on which the plate 4 is mounted, and a bearing
I'I formed on the plate 3. A pulley I8 is mount 30
ed on the shaft I5 whereby the latter may be
driven from any convenient power source.
A
pinion I9 secured to the shaft I5 meshes with
a gear 2U which runs free on a shaft 2| journaled
centrally and longitudinally of the bed I in bear
ings 22. A countershaft 23 is journaled along
one side of the bed I in bearings 2t.
The shaft
23 is adapted to be driven by the shaft 2I through
a gear and pinion drive, the gear thereof being
40
shown at 25.
The mandrel
As best shown in Fig. 4, the mandrel 2 has re
duced ends, one of which is firmly seated in a ring
26 pivoted to the plate 3 at 2l. A set screw 2_8 45
permits the ring 2l to be so tilted as to position
the other end of the mandrel accurately. The
other end of the mandrel extends through an
opening 29 in the plate li, the reduced end thereof
being ñrmly secured to an anvil ring 30, the 50
function of which will appear later. The carriage
5 includes a member 3i in the form of an annular
ring or block slidable on the mandrel 2, being
guided therealong by a ratchet bar 8 reciprocable
in a suitable slot extending longitudinally of the 55
2
2,104,993
Y mandrel, the bar 8 serving as a feather key for
the surface 58 of the detent 56 with the abutment
59 tilts the lever 55 and places the latch 54 in
the block or carriage 3l. A constant retracting
force is exerted on the carriage 3l by a counter
weight 33 connected thereto by a cable 34 trained
around a pulley 35. The pulley is mounted on a
position to hold the pawl 5l in elevated position. Y
After the pawl has been raised in the manner in
dicated, no further forward movement of the car
bracket 3S secured to the plate 3|.
Semi-circular clamping jaws 31 are pivoteld
riage 3l is effected despite continued reciproca
tion of the bar 8. The abutment 59 and the de
tent 56 thus operate as an automatic stop mecha-
to the carriage 3l on a pin 38. These jaws have
Ynism for the step by step feed of the carriage 3 I.
A stud 62 is adapted to engage the slide 41 to
apart by a compression spring 4D, the ends of contract the clamping jaws 31 when the carriage
3l is in the position shown in solid lines in Fig.
which are seated in sockets 4! formed in the abut
4. A stud 63 engages the slide 41 as the carriage
ting ends of the jaws. The jaws 31 have depend
3l approaches the plate 4, to cause the clamping
ing lugs 42 through which a cam shaft 43 extends.
shoulders 39 which enter an annular groove
10 formed in the carriage, and are normally urged
15 A cam 44 adjustable on the shaft 43 is adapted to
cooperate with a ñxed cam 45 on the depending
lug of one of the jaws whereby to cause the jaws to
contract on rotation of the shaft. A lever 46
secured to the shaft 43 causes the latter to turn
Y20 to contract or release the jaws.
A slide 41 is movable in guides 48 mounted on
the side of the carriage 3l. The slide has a pin
and slot connection 49 with the lever 46. The
Ilever 45 is automatically operated on advance
and retraction of the carriage 3l in a manner to
be explained Yin greater, detail later.>
-
.
As best shown in Fig. 4, an end of the tubular
blank 1, which may be formed up into a cylinder
from flat stock by any convenient means (not
30 shown), is inserted in the annular space between
the clamping jaws 3'5 and the reduced end of the
carriage 3l indicated at 59.
The bending ring 5
is slipped over the other end of the blank. «
Worlc- feeding mechanism
35
The ratchet bar 8 cooperates with a pawl 5! to
advance the carriage 3i >step by step from the
40
45
50
55
solid line position, in which it is shown in Fig. 4,
to the position shown in dot and dash lines. The
bar 8 is reciprocated periodically by means to be
described later through a distance equal to the
pitch of the ratchet teeth thereon. The coopera
tion of the pawl 5I with the ratchet teeth causes
the carriage 3lY to move forward with thebar ß.
The outer end of the blank 1 slides over the anvil
ring 3G as the carriage 3l is advanced. The fric
tion between the ring 3i! and the blank and be
tween the carriage 3l andthe mandrel prevents
the latter from moving back with the bar t.
On backward movement of the latter, the pawl
slides in a vertical slot in the carriage 3i and
then engages the next tooth` The counterweight
33 exerts a restraining force on the carriageäl to
prevent it from being advanced more than one
step at a time, and to ensure close engagement
between the pawl and the ratchet teeth, to posi-v
tion the work accurately for the corrugating oper
ation.
_
VAlink 53 is pivotally mounted in Va bearing
15
jaws to be released.
The mechanism for reciprocating the bar 8 in
cludes a lever 32a connected to the end of the
bar 8 by a link 32h. The lever 32a is pivoted at
32e on the plate 3. A cam follower 32d is also
pivcted to the plate 3 at 320, and has a roller 20
32e at its lower end which traverses a groove in a
barrel cam 32j carried on the shaft 2l. V.The link
32a has a projection 32g extending into a slot
intermediate the ends of the follower 32d. Set
screws 32h permit -adjustment of the lever 32a 25
relative to the follower 32d, whereby the desired
movement of the ratchet bar 8 may be obtained.
The corrugatz'ng dies `
30
The blank 1 is corrugated and bent as it ad
vances over the anvil ring 30. . This ring has a
circumferential groove 64 which is wider adja
cent the bottom of the ring than at the top there
of.
The corrugations in the blank are thus more
closely compressed on the inner side ofthe elbow 35
than on the outside since, as indicated in „dot
and dash lines in Fig. 4, the emerging end of the
blank is bent upwardly to form the elbow. 'I‘he
corrugations formed on the outside of the bend
are slightly flattened or drawn out by the bend 40
ing operation.
`
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'
i
The corrugating dies» 9 are carried on slidesV
65 (Fig. 2A) which are movable ony theplate 4
radially of the circular opening 29 therein.
The
slides 35 are carried between segmental dovetail 45
guides 55a formed on the outer side of the plate
4. Reciprocation ofthe slides 65 is elîected by
an annular rim 66.
The ring 66 is rotatably car
ried by roller bearings 61 spaced about the plate
4, and is held against movement away from the 50
plate by keepers 58. The keepers are secured'by
screws to studs 69 mounted o'n the'plate '4. The
ring 63 has hardened inserts 15 spaced there
around for engagement with the' roller bear
ings 61.
55
Cam slots 1l are formed at intervals around
the ring 66. The outer sides of these slots are
provided with hardened inserts 12. The slides
E5 have roller bearings 13 thereon extending into
60 bracket 54carried on top of the carriage 3|.
A ' the slots 1l. By reasonvof the construction de
lever 55 is pivoted to the link 53, and a detent 55 scribed, counterclockwise rotation ofthe ring 65
is pivoted to the lever 55. The detent 56 has a will causeinward radial movement of the slides
hook 51 normally engaging one end of the link 65. Clockwise rotation of the ring 66 will cause
53. The detent 55 alsohas an inclined surface outward radial movement of the slides. Such
Y65 58 adapted to cooperate with an abutment 5S on backand forth rotary movement of the ring 65 is
the plate 4 having a similar surface. A spring provided by a crank arm 14 attached thereto, an
latch 60 is carried on the lever 55. At its lower
adjustable link 15 and an eccentric 16 on the
end, this latch has a projection capable of en
Y
gaging under a cooperating projection on the pawl shaft 23.
The oscillation of the ring 66 and the recipro
70 5l to hold the latter in elevated position. With
the parts in the position illustrated in Fig. e, cation of the ratchet bar 8 are timed so that the
however, a stud 5I is engaged by the latch Si) to corrugating diesrmove inwardly as .the ratchet
cause the latter to release the pawl 5 l. When the bar is retracted, the corrugating dies being with
drawn when the ratchet bar is advanced to -feed
carriage 3| has been movedforward tothe posi
75. tion shown in dot and dash lines, engagement of
the Work.Y ,
l
2,104,998
,
Bending arms
Bearing brackets 11 are carried at the working
vend (the left end, as shown in Fig. 1) of the ap
paratus, and a shaft 18 is journaled therein. The
ends of the shaft are flattened, as shown in Fig.
1.
The bending arms |0 are pivoted at 19 on the
flattened ends of the shaft. The holes in the
"arms l0 through which the flattened ends of the
shaft extend are relieved as at 80 to permit the
arms I0 to tilt on their pivots 19. Tension springs
8| extend between brackets mounted on the
shaft 18 and.v brackets secured to the lower ends
of the arms I0 for normally holding the arms in
15 `the position illustrated in Fig. 2.
The .arms I0, on oscillation of the shaft 18, are
adapted to engage lugs 82 formed on the bending
ring 6. Such engagement causes the bending
ring 6 to be deiiected upwardly as successive cor
20 rugations are formed in the blank 1, as indicated
in dot and dash lines in Fig. 4.
Oscillation of the arms I0 is effected by a
downwardly extending link 83 keyed to- the shaft
18. A tension spring 84 normally urges a set
25 screw 85 at the lower end of the link 33 into en
gagement with a slide 86 axially movable in a
guide 81 carried in the bed I. The slide 86 has a
roller 81a projecting into a slot 88 formed in a
barrel cam 89 on the shaft 2|. The oscillation
30 of the arms I0 is thus co-ordinated with the re
ciprocation of the forming dies 9 and the feed
bar 8.
35
Driving clutch and brake
The parts already described are operated by
the common drive || under the control of the
clutch I2 and the brake I3. A hub or block 90
keyed to the shaft 2| has an axial slot 9| in which
a slide 92 is movable. A spring 93 seated behind
40 the slide 92 normally’tends to move the latter to
the left, _as viewed in Figs. 11 and 12. The gear
"I9 has a hub provided with driving faces 94
adapted to engage the slide 92, as indicated in
Fig. 13, whereby clockwise rotation of the gear
45
I9 drives the hub 90 on engagement of the slide
92 by one of the faces 94. ' Between the faces 94,
the hub is provided with sloping surfaces 95.
Since the slide 92 is normally forced toward the
gear I9, the latter is normally in driving relation
the hub 90 through which the shaft 22 is
50 with
driven.
‘
-A link 96 pivoted to the bed at 91 is so dis
posed that its free end may be moved into the
space between the hub of the gear |9 and the
Vhub or block 90. The end of the link 96 is
55
rounded as at 98 for cooperation with a similarly
shaped surface 99 on the slide 92. If the link
96 occupies the position shown in Fig. 3, engage
ment of the surfaces 98 and 99, as the hub 90 ro
60 tates clockwise, will cause the slide 92 to be
forced back vinto the recess 9 I, thereby freeing the
hub from driving relation with the gear I9. Ro
tation of the latter continues thereafter with
out effect on the hub 90, until the free end of
65 the link 96 is raised to permit the slide 92kto be
moved back to the position indicated in Fig. 12.
The next engagement between one of the driving
faces 94 of the gear I9 and the slide 92 will cause
the hub 90 to move again with the gear I9.
The link 96 is operated from a rock shaft |90
70
through a linkage including links | 0| and |62.
The link 96 tends to fall by its own weight to the
position shown in Fig. 3 in which it causes dis
engagement of the hub 90 from the gear I9 in
75 the manner already described. It may be raised
3
to permit resumption of the driving relation by
tilting the rock shaft |00. The rock shaft |00 is
journaled in suitable bearings in the plates 3 and
4, and is provided with a cam block |03. A slide
|04 is mounted in bearings |05 on the plates 3
and 4 for longitudinal movement. An operating
handle |06 is secured to the slide |94. A cam
block |01 is adjustably mounted on the slide |04
for cooperation with the cam block |93. Move
ment of the slide |04 to the right as viewed in
Cil
Fig. 1, by cooperation of the cam blocks |93
and |01 causes counterclockwise rotation of the
rock shaft |00, as viewed in Fig. 3, to raise the
link 96. This movement also operates to release
the brake | 3 to permit free rotation of the hub
99 with the gear I9.
The brake I3 comprises a yoke |98 embracing
the hub 90. The yoke is pivoted to the bed | at
|09 and is split at a diametrically opposite point
to permit contraction thereof for gripping the
hub 90 in the manner of a friction brake. The
adjacent ends of the yoke, indicated at H0, are
normally urged apart by a spring IiI seated in
alined bores therethrough, and backed up by a
screw plug II 2. The ends |I0, however, may be
caused to approach each other by a camming
lever H3. A stud I|4 is threaded into the lower
end IIü of the yoke, is freely movable through a
hole in the other end | I0, and has a pivotal ccn
nection | l5 with the lower end of the camming 30
lever H3. The lower end of the lever ||3 is
bifurcated and extended to provide toes or cam
ming surfaces ||6 engaging the upper end I I0
of the yoke |98. When the lever ||3 is rotated
about the pivot ||5 clockwise, as viewed in Fig. 35
l1, the ends H0 of the yoke will be forced to
gether, and the body of the yoke will be sprung
sufficiently to grip the hub 90. Reverse rotation
of the lever ||3 will permit the spring ||| to
release the gripping engagement of the yoke |08
on the hub 90.
40
The lever IIS is operated simultaneously with
the rock shaft |09 from the slide |84. A link
I I1 is pivotally mounted on a bracket I I8 carried
on the plate 3, and is pivotally connected to the
end of the slide |04 which extends therethrough. 45
The lower end of the link II'I is pivotally con
nected to the lever || 3 by a link ||9. Movement
of the slide I |14 to the right, as viewed in Fig. l,
thus causes the brake to be released and the
clutch engaged. Reverse movement of the slide
causes disengagement of the clutch and engage
ment of the brake. The connection between the
link | |9 and the lever II 3 is provided by a pin
and slot ||9a providing a small amount of lost
55
motion. The amount of this lost motion may be
adjusted by a set screw H911 carried on a lug
depending from the link H9. By reason of this
lost motion, the brake I3 is not applied until an
instant after the clutch has been disengaged, 60
the sequence being, first, the disengagement of
the clutch and, after a very short interval, the
application of the brake to stop the shaft 2|.
The inherent resilience of the yoke |08 causes
the brake to be released as soon as the lever |06
has been moved to the right to cause engagement
of the clutch.
The operation of the device
The carriage 3| occupies the position indicated 70
in dot and dash lines in Fig. 4, at the commence
ment of an operating cycle. One end of the tubu
lar blank 1 to be corrugated and bent is ?rst in
serted in the annular' slot in the bending ring
6. While the blank may be formed in any con
arca-‘993
venient manner, bending rolls (not shownllmay
-well be driven by a shaft |20 which is driven 'by
ar belt and pulley drive from the shaft 2|, as
shown in Fig. .2. The shaft |20 is journaled in
bearings supported on angles |2| extending lat
erally from the bed |. The blank is inserted in
the ring 6 so that the lap joint is adjacent an
index mark |22 on the ring 6 (see Fig. 14). The
other end of the blank may then be inserted be
1.0 tween the clamping jaws 3l, which are opened
as a result of the engagement of the stud 63 With
the slide 47. The ring 5 carries a guide tongue
|23 adapted to cooperate with a guide plate |24
having a slot |25 therein, one end of the slot
being tapered, as at |26, to guide thev tongue- |23
entering thereinto. The plate |24 is mounted on
top of the bearing bracket 11, as shown in Fig. 2.
As the blank is pushed back over the mandrel
2, forcing the carriage 3| to the right, as viewed
in Fig. 4, the tongue |23 is guided into the slot
|25` to position the lap joint in the> blank accu
rately on the inside of the bend to be formed
therein.
'
-
When the carriage 3| is pushed back to the
position illustrated in solid lines in Fig. 4, the
stud 6| depresses the spring latch-'50 to release
the pawl 5|. The stud |52 automatically causes
the clamping jaws 3l to grip the end of the
sence of a forward'feed'of‘the workpiece. The
completed-elbow-may then be 'removed> from 4the
,carriage~V 3| and, if desired, the flap joint riveted.
The bendingring 6~is removedfrom the blank
and the Ymachine is-then ready for a repetition of the operating cycle just described.
y
Y
It will be apparent from the foregoing> descrip
tion that the invention is characterized by nu-V
merous features of noveltyfand advantage-com
pared to devices of this character »which have 10
beenknown heretofore. The construction of the
.mechanismforoperating the -corrugating dies is
simple, sturdy Vand rugged, and therefore not
likely to cause difliculty in operation. The au
tomatic» clamping for Aengaging the end of the ¿Í
blank firstinserted in the machine is highly ef
fectivefto. hold the blankin> proper position dur
ing the fabricating operationfsince it engages the
blank substantiallythroughout the circumference
of the latter, and release it in ample time for
quick removal. >The brake operation is automat
ically `co-ordinated «with the operation of the
clutch tostop the. machine instantly when the
clutch is disengaged, vpreventing continued oper
ationÍ by the momentum'- of the rotating parts.
Th adjusting means yincluded in the linkages op
erating.theratchetbarV and the corrugating dies
permit the several steps of the- operation to be
blank inserted between them and the end of the
timed» accurately so there willbe no interference
30 carriage 3|. Needless to say, the corrugating
dies 9 should be retracted before it is attempted
Although I have illustrated and described «but
to insert the blank into the machine.
As` the
bending ring 6 approaches the arms |0 during
the insertion of the blank into the machine, the
35 lugs 82 engage divergent wings |27 extending
outwardly from the arms. Advancement of the
ring G causes the arms lû to shift outwardly on
their pivots 19 to permit the ring to pass there
between. After the ring has passed t0 arms, the
140 vspringsßl restore them to their normal position
in which they cooperate with the lugsï82 to bend
the emerging blank.
The machine may be started by pushing the
leverlûä to the right. This raises the lever 96
and permits the clutch kl2 to become engaged by
advancement of the block 92? into such position as
oroverlapping of operations.
at
one preferred embodiment of the invention, it
will be recognized that changes in the construc
tion disclosed may be -made withoutydeparting
from the spirit of the invention- or'the scope of
the vappended claims.
I claim:
Y
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»
1.~,In-an elbow forming machine, having a man
drel, :a carriage reciprocablef thereon «adapted Vto
receive one end of a- tubular yblank to> be formed
into anv elbow, a reciprocable ratchet bar> and a
pawl . on said carriage cooperating therewith
“lio
whereby to advance the carriage stepv by step;
a lever tiltably mounted on said carriage, asec
ond lever .pivoted thereto, a detent pivoted on the
1135
second lever and releasablyV engageable with _the
'I‘he „ñrstVapawl-holding latch on said second lever
andfmeans engaged by said detent on movement
of the carriage to its extreme forward position,.to
explained. Intermittent operation of the -form
ing dies e, bending arms H3 and ratchet bar 8 trip said detent and disengagev the i'lrst` men
lcioned lever, -whereby to tilt both said Ylevers
proceeds in such co-ordinated fashion as succes
sively toV form corrugations, bend the emerging and thereby move said latch into pawl engaging
1
end of the blank, compressing the corrugations position.
2. The-apparatus defined by claiml character
on the inside of the bend and flattening or
stretching those on the outside, and then notch ized by »means for resetting said levers and releas
ingsaid latch on movement of the carriage to its
the blank forward for repetition of these opera
tions. When the required number of corruga~ extreme rearward position.
3. In» anelbow corrugating and .bending ma
tions and bending impacts have been applied, the
carriage 3| Vapp-roaches the plate lì andthe detent chine having feed, Vcorrugating and bending
to be engaged by the driving surfaces >M.
brake |23 is simultaneously released as already
60 55» engages the abutment 59 to place the spring
latch 607m the position to engage and hold up
the pawl 5|.
Engagement of the stud 63 by the
slide M causes the latter to shift and release the
clamping jaws 3l.
The clutch may then be dis
65 engaged and the brake engaged by moving the
handle |06 to the left, although failure to do so
will not result in any damage, as'the feed means
is rendered ineffective by the latch Gû. While op'
eration of the corrugating dies and the bending
arms I0 continues until thehandle |06 is shifted,
such operations will produce no effect in the ab-
means, a drivefor said means including a clutch,
and a brake; a lever for operatingsaid clutch and
alever for operatingV saidA brake, said levers be
ingpivoted onv axes at substantially right angles,
and common means for actuating said levers
comprising .a slide bar linked to one lever, a rock
shaft parallel to said bar and having a crank
thereon, means connecting the crank to the other
lever and cooperating means on the slide bar and
rock shaft to cause rotation of the latter on -re
ciprocation of the former.
'
CHARLES J. HOLUB.
a
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