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Патент USA US3078913

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Feb. 26, 1963
3,078,903
P. 1.. CADY, JR
BRAKE FOR FORMING METAL PLATE AND SHEET
Filed Sept. 1, 1961
4 Sheets-Sheet 1
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INVENT R.
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ATTORNEYS.
Feb. 26, 1963
P. L. CADY, JR
3,078,903
BRAKE FOR FORMING METAL PLATE AND SHEET
Filed Sept. 1, 1961
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4 Sheets-Sheet 2
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ATTORNEYS.
Feb. 26, 1963
3,078,903
P. |_. CADY, JR
BRAKE FOR FORMING METAL PLATE AND SHEET
Filed Sept. 1, 1961
4 Sheets-Sheet 5
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$595
5%
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7
ATTORNEYS.
Feb. 26, 1963
3,078,903
P. |_. CADY, JR
BRAKE FOR FORMING METAL PLATE AND SHEET
" Filed Sept. 1, 1961
4 Sheets-Sheet 4
3,0783%
Patented Fete. 26, 1953
1
2
FIG. 7 is a fragmentary view similar to FIG. 4- illus?
trating how the workpiece or the mandrel could be bent
out of true without the practice of the present invention.
FIG. 8 is a diagram of the hydraulic circuit and show
3.073393
BRAKE FOR FGRMING METAL PLATE
AND SHEET
Percy L. Cady, .lrz, Darien Center, NY.
Filed Sent. 1, 1961. Ser. No. 135,674
4 Claims. (Cl. 153-16)
ing a simpli?ed diagram of the electrical components.
The brake of the present invention is an improvement
on the brake described and disclosed in detail in the said
Cady application, Serial No. 8,603, ?led February 15,
This invention relates to a brake for forming metal
1960, now Patent No. 3,044,526, and reference is made
plate and sheet having a pair of forming aprons or wings
to
this copending application for a more detailed descrip
10
swingable about a common forming axis which is adja
tion of the identical mechanical components of the brake.
cent and parallel with the working surfaces of the aprons
The frame of the sheet metal brake comprises a pair
of end columns or stands indicated generally at 39 and
connected at their lower ends by a horizontal beam 31
The invention forming the subject of this application 15 and at their upper ends by a horizontal beam 32. Each
of the columns 36} has a rectangular base plate 33 welded
is an improvement on the brake shown in the Cady ap
and which brake also includes a mandrel movable toward
and from the forming axis and around which the aprons
or wings bend the metal plate or sheet.
' to and supporting a main or backbone plate 34 of the
plication, Serial No. 8,603, ?led February 15, 1960, now
‘Pat. No. 3,044,526, and in common with said applica
column. This main plate 34 of each column is rein
forced along its front and rear vertical edges by ?anges 35
tion important general objects are to provide a brake
which is adapted to the production of a wide variety of 20 and 36 so as to provide a post which is of channel form
in horizontal cross section opening outwardly as best
forms by virtue of the ability to adjust the wings inde
pendcntly of each other with reference to the forming - shown at the left of FIG. 2.
In addition the main or backbone 34 of each column is
axis; which is simple and rugged in'construction but ca
reinforced by triangular gussets 33 the bottom edges of
pable of very ?ne adjustment; which can be power op
which are welded to the base plate 33. Each bottom
erated and readily set to semi-automatic operation to fa
plate 33 also has welded thereto an upstanding plate or
cilitate the successive production of identical forms, and
bar 39 to which the ends of the lower bottom cross beam
which will stand up under conditions of severe and con~
31 are suitably secured in any suitable manner.
s‘tant use without getting out of order or requiring repairs.
Each column 36 also includes an upper box portion
A speci?c object of the present invention is to avoid 30
indicated generally at 4%‘, these box portions being se
the production of defective products due to the workpiece
cured
to the upper parts of the main or backbone plates
slipping during the operation of the aprons or wings
34 in opposing relation to each other. Each box portion
thereon, or due to the mandrel being bent horizontally
out of alinement with the forming axis by the operation
23% comprises a rear plate 41 and a front plate 42, these
plates being secured, as by welding, to the front and rear
edges, respectively, of the main plate 34 of each column.
of the aprons or wings.
Another speci?c object of the invention is to avoid
damage to the mandrel from unbalanced pressures im
posed upon the mandrel by the workpiece in response to
the operation of the aprons or wings.
The outboard or opposing edges of these plates 41,- 42
are connected by a cross plate 43 so as to complete the
box section.
'
The top of each box portion 46 is enclosed by a block
'44- secured therein in any suitable manner and to which
These speci?c objects are achieved by controlling the
initial movement of the aprons relative to each other and
to the mandrel so that neither can proceed beyond a pre
determined angularity until the other apron has reached
blocks the opposite ends of the upper cross beam 32 are
secured. A horizontal cross plate 45 connects the bot
tom edges of the rear and front plates 41, 42 of each box
a substantially similar vangularity. ‘This control insures
portion
(til, the plates 43 projecting downwardly below
the production of an initial shallow channel in the work 45
these horizontal cross plates. The depending end of each
piece, the sides of which rise along both sides of the
mandrel. When this condition obtains either apron can > of these plates 153 carries a boss 46, these bosses being in
horizontal coaxial alinernent with each other and with
be further advanced independently of the other apron
bosses 48 on the main plate 34 of each column 49. The
without danger of causing the workpiece to slide under
the mandrel or without danger of the mandrel being bent 50 bosses 156, 48 of each column 30 carry the main pivot pin
49 of the brake, each ‘main pivot pin also being supported
laterally, and possibly broken because both the mandrel
at its center in a plate 56' depending from the center of
the corresponding horizontal cross plate 45 as best shown
in PEG. 2..
The main pivot pins 49 support the knuckles of rear
and front aprons indicated generally at 51 and 51a as
hereinafter described, these aprons cooperating with a
clamping ram indicated generally at 53 in bending a
and the workpiece are held securely in proper relation
to the forming axis by virtue of the shallow groove, with
its opposite rising sides, holding the workpiece in, ?xed
relation to the mandrel.
‘
Other objects and advantages of the invention will be
apparent from the following description and drawings in
which:
FIG. 1 is a front elevational View of a brake for metal
plate or sheet embodying the present invention.
FIG. 2 is a view similar to FIG. 1 but with parts
60 formed. This clamping ram 53 includes a holder in the
broken away to illustrate operating mechanism contained
within the end columns of the brake frame.
FIG. 3 is an end elevational view, viewed from the
right hand ends of FIGS. 1 and 2.
FIG. 4 is an enlarged vertical fragmentary section
taken generally on line 4—4, FIG. 2.
PKG. 5 is a fragmentary enlarged vertical section taken
generally on line 5--5, FIG. 2.
FIG. 6 is an enlarged fragmentary front elevational I
view of the right hand column of the brake, as viewed in
FIGS. 1 and 2, with the cover 193 removed.
plate or sheet of metal 55 (FIG. 7) to the desired form,
this ?gure illustrating how the workpiece should not be
form of a vertical plate or beam 54 arranged directly
above and parallel with the axis of the main pivot pins
49 and having its opposite ends protruding through open
ings 56 in the plates ‘:53 into the interiors of the box por
tions ‘iii of the end columns 35 of the brake frame.
Within each column 3% of the brake frame, the cor
responding end of the plate or beam 54 is guided for ver
tical movement toward and from the axis of the main
pivot pins 43 between a pair of slide guides 58 on the op
posing faces of the rear and front plates 4-1, 42 of each
end column 3% of the brake frame, as best shown in
3,078,903
.3
-
4
FIG. 2. The plate or beam 54 is held against endwise
a rabbet 122 along the lower edge of, the beam or plate
displacement by having a brass liner 60 secured to each
of its ends and engaging a slide guide 61 secured to the
main or backbone plate 34 of the corresponding end col
54 of the clamping ram 53 by means of a plurality of
umn as best shown in FIG. 2.
Hydraulically or pneumatically actuated means are pro
vided for moving the opposite ends of the clamping ram
53 vertically into and out of engagement with the work
piece 55 on the two aprons 51, 51a, these means pref
erably being constructed as follows:
The numeral 65 represents an ear secured to and pro
clamping plates 123 clamped against the upper end of
the blade 12!} by means of a plurality of screws 124. It
will be seen that in deforming a workpiece held down on
the aprons 51 by the mandrel blade 120, it is important
that the forming pressures be balanced so as not to dis
place its nose 121 laterally.
Each of the two aprons 51, 51a, on which the work
10 piece 54 is clamped by means of the mandrel 120 can be
of various construction but is shown as an example as
jecting from the exterior face of the main backbone plate
constructed as follows:
34 of each end column 30. To each of these cars is
pivoted the lower end of a cylinder 66 containing a pis
large metal plate extending lengthwise of the mandrel 120
Each apron 51, 51a includes a wing in the form of a
ton 68 including a piston rod projecting upwardly from 15 and at the start of the forming operation these wings or
plates are arranged in closely spaced vertical face-to-face
the cylinder. A pivot block 69 is ?xed to the upper
relation, as shown in FIG. 4, on opposite sides of a plane
end of each piston rod 68 and this block 69 is interposed
intersecting the forming axis of the mandrel 120 which
between the generally horizontally projecting arms 70 of
is at the center of its rounding nose 121. Both wings have
a corresponding pair of bell crank levers 71, the other
generally vertically projecting arms of which are indi 20 ends of reduced height and the wing at the rear of the
rake is designated at 125 and the wing at the front
cated at 72. The arms 72 of the bell crank levers 71
of the brake is designated at 12511, the latter being some
are housed within the box portions 49 of the end col
what longer than the former. Along the upper edge of
umns 30 of the frame and the arms 70 project outwardly
each wing 125, 125a, a reinforcing angle bar 126 is se_
through openings 74 in the main or back-bone plates 34
of these columns. The outer ends of the arms 70 are con 25 cured, as by screws 127, to its outer face, these angle bars
nected to the blocks 69 by pivot pins 75 and within the
box portions 46 the bell crank levers 71 are supported at
extending the full length of the wings and each clamping
a forming blade 128 to the top of each wing. For this
purpose, each forming blade 128 is L-shaped in cross
section and is clamped in a rabbet 129 along the upper
is journalled in 1a bearing in the stem of a screw 80, the
ball crank levers 71 being arranged on, opposite sides 30 edge of each wing. The working surfaces of these form
ing blades 128 face upwardly.
of the shank of the screw. Each pin 76 is guided for
their centers by large pivot pins 76. Each pivot pin 76,
vertical movement in the manner disclosed in detail in
Each apron 51, 51a is preferably independently pivoted
on the main pivot pins 49 and are also independently
adjustable toward and from the forming axis by means
ment of the horizontally projecting arms 70 of the bell
which are preferably constructed as follows:
crank levers by the piston 68 effect horizontal movement
The numeral 130 represents a square nut ?xed to each
of the arms 72 thereof, these last arms forming one side
end of each wing or plate 125, 125a on the outer face
of a toggle linkage connecting with the corresponding
thereof, these nuts being arranged parallel with one an
end of the plate or beam 54 of the clamping ram 53.
other and in planes perpendicular to the forming axis.
For this purpose, the lower ends of the arms 72 of each
pair of bell crank levers 71 embrace the upper end of a 40 A screw 138 works in each nut 130, these screws being
rotatably mounted on pins 139, the inner end of each of
toggle link 84 and are connected thereto by a pivot pin
which pins being ?xed in a hinge arm 141 having a pair
85. The lower end of the toggle link 84 is interposed
the said Cady application. Accordingly, vertical move
between a pair of ears 86 to which it is connected by a
pivot pin 88. Each pair of cars 86 is ?xed to and pro:
of knuckles 1142 journalled on the corresponding main
pivot pin 49 as best shown in FIG. 2. As shown in this
jects upwardly from the corresponding end of the plate 45 ?gure, the knuckles 142 of the front apron 51a are ar
ranged in alternation to the knuckles 142 of the rear
or beam 54 of the clamping ram 53.
.
Means are provided for adjusting the working posi
tion of the clamping ram 53, these means being pref
erably constructed as follows:
The numeral 90 represents a hand crank suitably jour
ualled on the column 36 at one end of the brake and turn
ing a pinion 91 connected by a drive chain 92 with a pinion
93 at one end of an adjusting shaft 94 suitably journalled
apron 51.
Each screw 138 is pinned, as indicated at 144, to a
worm wheel 145, these worm wheels being arranged in
a common horizontal plane in the upright position of the
aprons 51, 51a. To prevent lengthwise movement of
each screw 138 and its worm wheel 145 lengthwise of
the corresponding pin 139, a collar 146 is pinned to the
outboard end of each pin 139 to engage the correspond
on the upper end of that column. One end of this shaft
94 is connected by a releasable coupling or jaw clutch 95 55 ing worm wheel 145. The opposite end of each screw
1318 rotatably engages the corresponding hinge body 141
with a shaft 96, the opposite end of which is suitably
and preferably has an enlarged annular ?ange 148 inter
journalled at the other end column 39 of the machine.
posed between this hinge body 141 and its nut 130 and
The coupling 95 can be manually connected or discon
bearing a series of graduations 149 so that the angular
nected in the manner disclosed in detail in said Cady
application.
60 position of each screw 138 can be determined by refer
ence to the scale provided by these graduations 149.
Above each end column 30, the corresponding shaft
This scale provides ‘a ?ne adjustment scale for the posi
94 and 96 carries a worm 110 which is ?xed thereto and
which meshes with a worm wheel 111. The latter is suit
tion of each screw 138, thereby to determine, with a high
degree of accuracy, the axial position of each nut 130.
ably secured as by the screw 112 shown in FIGS. 1, '2
and 3, to the upper end of a nut 114 journalled to ro 65 A coarse scale for the position of each apron is provided
tate about a vertical axis in a bearing 115 in the block
by a bar 150 secured to each not 130 to project upwardly
44 at the upper end of each column 39. Each nut is
therefrom and bearing a series of graduations 151 ar~
threadedly connected with the upper threaded end of
ranged to traverse a reference point (not shown) on the
corresponding hinge body. 141.
the corresponding screw 80.
The workpiece is engaged by a mandrel 120 remov 70
As previously indicated, the worm wheels 145 are
ably secured to the bottom of the plate or beam 54 of the
adapted to be brought to a common horizontal plane and
clamping ram 53. The mandrel is shown as being in the
when brought to this position, each engages a worm 155
form of a rectangular blade having a rounding bottom
fast to an adjusting shaft 156. This adjusting shaft ex
longitudinal nose portion 121‘engaging the workpiece 55.
tends the full length of the brake and is journalled iu
The upper edge. of this blade is. shown as. clamped. in
bearings 158, 159 on the end columns 39 of the frame
8,078,903
5
This shaft has ?xed thereto a sprocket 160 connected by
a chain 161 with a sprocket 1:62 fast to the crankshaft
163 of a hand crank 164. It will be seen that turning
the hand crank 164 turns the shaft 156 and its worms
155, thereby to turn the worm wheels 145 engaging these
reference to the switches 21% and 210a, as well as permit
the return movement of the aprons.
Referring to the hydraulic circuit, FIG. 8, the numeral
215 designates a motor driving a pair of hydraulic pumps
2'16 and 2-18 drawing oil from a supply 219. The pumps
216, 2,18 deliver the oil through lines 2269 and 221, re
worms and hence the corresponding screws 133.
Means are provided for swinging the aprons 51, 51a
spectively, to a common line 222 delivering the oil to a
independently of each other on the main pivot pins 4%,
three position spring centered solenoid valve 223. The
lines 2126} and 221 contain check valves 224 and 225, re
these means being preferably constructed as follows:
The numeral 165 represents an ear fast to and project 10 spectively, opening in the direction of oil flow from the
pumps and the line 22th contains a relief valve 226 re
ing outwardly from each nut 13%. To each ear is pivot
turning oil under excess pressure to drain 228. The
ally connected, as indicated at 166, the piston 168 con
common line 222 contains a relief valve 22s returning oil
tained in a cylinder 169. The piston and cylinder for
under excess pressure to drain 223.
the rear apron are distinguished by the suf?x “a.” The
In the centered position of the three position valve 223
upper end of this piston is pivotally connected, as in
the supply line 222 connects with a port 2-3'1) providing
dicated at 179, to an car 171 ?xed to and projecting
outwardly from the corresponding plate 43, 42 of each
communication with a line 23ft having a branch 232 lead
ing to a solenoid valve 233. In the deenergized condi
tion of this solenoid valve, the line 232. is connected by
For repeated operation of the brake in the production
of identical forms, it is desirable that each apron 5-1, 51a 20 port 234 to drain 2,28. In the energized condition of this
solenoid valve the ?ow of oil from the line 232 to drain
be individually stopped at the angular position required
is cut off, this line being provided with a relief valve 235
so that the operator has merely to place the workpiece
discharging to drain 228 under excess pressure.
55 in position, clamp the workpiece against the aprons
The spring centered three position solenoid valve 223 is
51, 5111 by the mandrel 12%, and start the operation of
these aprons, the aprons automatically stopping when the 25 moved to one extreme position to move the clamping ram
53 into engagement with the workpiece by energizing its
workpiece is bent to the required form. The mechanism
solenoid 236. This can be done by a sv itch 237 actuated
for accomplishing this is preferably constructed as follows:
by the operator. ‘When the solenoid 236 is so energized,
The numeral 190' represents a segmental plate fast to
the oil supply line 222 is connected by port 238 to a line
the exterior of one knuckle 142 of each apron Sill, 51a,
239 connected by ?exible hoses 24-63 to the lower ends
this being at the right hand end of the brake as viewed
of the clamping cylinders en. The line 239 contains a
in FIGS. 1 and 2. As best shown in PEG. 5, a Wire 1191
relief valve 244. discharging to drain 228. Also when the
is ?xed to the leading edge of each of these segments so
end column 33.
that as each apron 51 or 51a is swung about the main
pivot pins 49, the corresponding wire 191 is moved
longitudinally proportionally. Each wire 191 passes
around pulleys 19-2 (FIGS. 1 and 5) to the top of the
solenoid is so energized, port 242 connects the line 231
with a line 2453 connected by ?exible hoses 244 with the
tops of the upper ends of the clamp cylinders 65 to permit
the escape of oil therefrom.
The spring centered three position solenoid valve 223
adjacent column 39 of the frame and thence downward
is moved to its other extreme position to move the clamp
along the side of this column behind a cover plate 193.
ing ram 53 out of engagement with the workpiece by
The other end of each wire 1911, as best shown in FIG.
11, is secured to a vertically reciprocating rod 194, these 40 energizing its solenoid 245. This can be done by a switch
246 actuated by the operator. When this solenoid 245
rods being mounted for this purpose in stationary slide
is
so energized, the oil supply line 222 is connected by
bearings 195. Weights 1% are secured to the lower ends
port 249 to the line 243 and the line 239 is connected by
of the rods 1% and a sleeve 1% is adjustable along each
port 25% to the line 231.
of these rods. The upper end of each sleeve is in the
The pistons 2168, 168a of the two aprons 51, 51a are
form of a square head 19% carrying a set screw 2% hav
ing a handle by means of which the set screw can be re
eased to free the corresponding sleeve 1% for adjustment
vertically along its rod 194, the sleeves being guided in
selectively actuated by oil supplied from the line 231 by
substantially identical hydraulic and electrical circuits,
and hence a description of one will be deemed to apply
to both the components of the hydraulic and electrical cir
stationary slide bearings 282. Each set screw 2% ex
tends through a vertical slot 2% in the cover 193 for 50 cuit for the front apron being distinguished by the su?ix
ready accessibility of its handle and the cover 193 is also
“a.” Each of these hydraulic circuits is preferably con
provided between these slots with another vertical slot
2% through which a graduated scale 2% is visible. This
scale is calibrated in degrees of angularity up to 90° ‘and
structed as follows:
An important feature of the invention resides in each
rod 194 additionally carrying a vertically elongated cam
solenoids 259, 25% also preferably being in series with
The numeral 255 represents a branch line containing
a check valve 256 and leading to a three position spring
centered solenoid valve indicated generally at 258. In
is traversed by a pointer 2% on the square head 1% of 55
the spring centered position of this solenoid valve, all
each of the sleeves 1%.
lines connected with the valve are blocked as shown.
Each of these sleeves 198 carries a stop in the form of
Each spring centered three position solenoid valve 258
a earn 2% operating an electrical switch, the switch for
is moved to one extreme position to effect operative
the rear apron being designated at 21th and the switch
60 movement of the apron 51 by energizing its solenoid 259.
for the front apron being designated at 216a.
This can be done by means of a switch 260, the two
the solenoid 261 of the valve 233 by means of a branched
bar 211 in position to engage, actuate and hold the arm
electrical line 262 so that energization of either solenoid
of a switch, the switch for the ear apron being desig
2559 or 25% will also effect energization of the solenoid
65
noted at 212, and the switch for the front apron being des~
261 of the valve 233. When the solenoid 259 is so ener
ignated at 2312a. Each cam bar 211 is arranged to engage
gized, oil from the branch line 255 is conducted by port
and actuate its switch 212. or 222:: when the correspond
263 to a line 264 connected by flexible hoses 265 with
ing apron has reached an angularity of approximately
the bottoms of the cylinders 169. Each line 264 contains
15° with reference to the horizontal. The essential func 70 a check valve 2'70 opening toward the cylinders 169.
tioning of these switches is to arrest either apron when
Also when the solenoid 259 is so energized, a port 271
it reaches such 15° position until the other apron reaches
connects the line 2'72 from the top of the cylinders 169
a substantially similar position, following which these
with drain 22%. The line T2 is connected to the top of
the pair of cylinders 169 by flexible hoses 273.
switches permit completion of the movement of the
aprons as determined by the settings of the cams 2929 with 75
Each spring centered three position solenoid valve 258
‘aoeaeos
7
is moved to its opposite extreme position to etlect return
movement of the aprons 51 by energizing its solenoid
274-. Provided the switch 212 permits, this can be done
by the switch 216 which also simultaneously energizes the
solenoid 261 of the valve 233 through the branched line
262. When solenoid 274 is so energized branch line 255
is connected by port 276 with line 272. A regenerative
circuit line 267 connects the line 264, between the cylin~
8
same rate. Accordingly both worm wheels 111 are turned
in unison, thereby to turn the nuts 114 and raise or lower
the screws 86. Vertical movement of these screws 80
effects vertical movement of each of the toggles 72, 84
and the clamping plate or beam 54 together with the
mandrel 12h suspended therefrom.
If it is desired to adjust one end of the mandrel 120
higher than the other, or to correct any such differential,
ders 169 and check valve 270, with the line 255, between
the left hand end of this mandrel, as viewed in FIGS. 1
the three position solenoid valve 258 and the check valve 10 and 2 is adjusted to the proper height as above described,
256.
the clutch or coupling 95, FIGS. 1 and 2 is uncoupled,
A globe valve 278 is provided between lines 264 and
and the crank 90, FIGS. 1, 2 and 3 is then turned in the
272 to permit slow movement for setting up the aprons.
Likewise a globe valve 279 can be provided between lines
239 and 243 to permit slow movement for setting up the
clamping ram 2553.
The present invention is essentially concerned with the
switches 212 and 212a which respectively control the
travel of the aprons or wings 51, 51a during approxi
mately their ?rst 15° of movement upwardly and out~
‘proper direction, this turning only the adjusting shaft
94, FIG. 2, thereby to turn the worm wheel 111 at the
right hand end of the brake, as viewed in FIGS. 1 and 2
to the exclusion of the worm wheel 111 at the other end
of the brake. Accordingly, only the nut and screw adjust
ment 114, 89 at this right hand end of the brake will be
actuated and hence only the corresponding end of the
mandrel 120 will be raised or lowered.
wardly from their face-to-face position illustrated in FIG.
The working surfaces or forming blades 128 of the
4, in such manner that neither wing or apron can swing
aprons 51, 510 are adjustable with reference to the form
ing axis to adjust the brake to the thickness or form of the
beyond this approximate 15° position until the other wing
has reached this position. For this purpose the switch 212
workpiece 55, this forming axis as above described being
(FIG. 6) which is moved in response to the cam bar 211 25 coincident with the axis of the main pins 49 for these
moving in synchronism with the rear wing 51, has a pair
aprons. Assuming it is desirable to adjust both aprons
of movable contacts 280 and 281 (FIG. 8) which are
51, 51a uniformly in this regard, as for a particular thick
coupled to move together, these contacts being moved
ness of the workpiece 55, this adjustment is e?ected by
upwardly from the positions shown in FIGS. 6 and 8
turning the crank 164, FIGS. 1, 2 and 3, thus, through
when the cam bar 211 of the wing 51 engages and lifts
the chain 161 turning the sprocket 169 fast to the shaft
the contact 280. Similarly, the switch 212a (FIG. 6)
156 carrying the worms 155. These worms, in the pendent
which is moved by the cam bar 211 moving in syn
position of the aprons 51, 51a, engage the worm wheels
chronism with the front wing or apron 51a has a pair of
145, FIGS. 1, 2 and 4, so as to turn these worm wheels
movable contacts 284 and 285, these contacts being moved
and the screws 138 pinned thereto. Each screw 138 is
upwardly from the positions shown in FIGS. 6 and 8
rotatably secured, but held against longitudinal movement
when the cam bar 211 associated with the wing 51a en
with reference to the knuckle 141 at each end of each
gages and lifts the contact 284.
The movable contact 280 is permanently connected to
a wire 286 one end of which connects with the side of the
apron and hence this rotation of these screws 138 serves
to move the sleeve nuts 130 longitudinally. Since these
sleeve nuts are secured to the wings or plates 125, 12511
solenoid 259 opposite from that connected with the wire 40 of the aprons 51, 51a, this adjusts these wings or plates
2?2 and the other end of which wire 263 connects with
the movable contact 285 of the switch 212a The movable
contact 281 engages a ?xed contact 290 permanently con
the forming blades 128 carried thereby, with reference
to the forming axis. The coarse adjustment of each apron
51 or 51a can be seen at each end on the scale on the
nected by a wire 287 to the ?xed contact 288 engaged
upstanding rod 150 on each sleeve nut 130 and the ?ne
by the movable contact 284 of the switch 212a, this ?xed 45 adjustment of each apron can be seen on the scale 149
contact 288 also connecting with the switch 262a The
around the top of each sleeve nut 130.
movable contact 284 is permanently connected to a wire
After such adjustment and with the clamping plate or
289 one end of which connects with the side of the sole
beam 54 and its mandrel 120 in elevated position, the
noid 259a opposite from that connected with the line 262
55 is placed upon the aprons 51, 51a as shown
and the other end of this wire 289 connects with the 50 workpiece
in FIG. 7.
movable contact 281 of the switch 212. The ?xed con—
With the motor 215 and pumps 216, 218, FIG. 8,
tact 291 engaged by the movable contact 280 of the switch
running, oil at this time is being supplied under pressure
212 connects with the switch 269 and also via a wire 292
from the source 219 through the lines 220 and 221 to the
with the ?xed contact 293 engaged by the movable con
common line 222, this oil passing through the port 230
tact 285 of the switch 212a.
of the now spring centered three position solenoid valve
223 to the line 231 and thence through the port 234 of
Operation
the deenergized solenoid valve 233 to drain 228.
In this description of the operation of the brake, it will
be assumed that a metal plate is to be formed into an
The operator ?rst brings the clamping ram 53 down
to cause the nose 121 of the mandrel 120 to clamp the
angle around the rounding nose 121 of the mandrel 128. 60 workpiece 55 ‘against the forming blades 128 of the
It will also be assumed that the motor 215 is running
and driving the pumps 216 and 218.
In producing an angle from the plate 55, the forming
aprons 51, 51a. He does this by closing the electrical
switch 237. This energizes the solenoid 236 so as to
shift the spring centered solenoid valve 223 so as to con
axis is the center of the rounding nose of the mandrel 129
nect its port 238 with the lines 222 and 239 and its port
and this forming axis must be coincident with the axis of 65 .242 with the lines 243 and 231. Accordingly, oil under
the main pivot pins 49 on which the aprons 51, 51a swing.
pressure from line 222 ?ows through port 238 and line
In the event that it is necessary to raise or lower this
239 into the bottoms of the cylinders 66 thereby to pro
forming axis to effect such coincidence, the height of the
ject the pistons 68. The oil at the opposite sides of these
mandrel is adjusted by turning the crank 90, FIGS. 1,
2 and 3, through the chain 92, turning the sprocket 93 70 pistons 68 is relieved through the lines 243, port 242,
line 231 and solenoid valve 233 to drain 228.
fast to the adjusting shaft 94. Assuming that it is desired
This projects the pistons 68 thereby to swing the bell
to adjust both ends of the mandrel 126 uniformly, the
crank levers 71 about the pivot pins 76. The end 72 of
coupling 95, FIGS. 1 and 2, would remain coupled dur
ing this adjustment so that the shaft 96 turns with the
adjusting shaft 94, thereby to turn both worms 110 at the
each of these bell crank levers form one side of a toggle
linkage '72, 84 which forces the clamping ram 53 down—
8,078,903
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wardly in response to this projection of the pistons and
piston rods 63. In this movement the clamping ram 53
is guided ‘against lateral displacement by slide guides
58 (FIG. 2) and against endwise displacement by the
slide guides 61. This action of the pistons 68 is in the
cylinders 66, through the bell cranks 71 and toggle links
72, 84, brings the forming axis of the mandrel 12%
(center of its nose 121) into concentricity with the axis
of the main pivot pins 49 and the nose 121 of the mandrel
against the top of the workpiece 55 to clamp it down on
the aprons 51, 51a. When the pressure supply to the
spring centered solenoid valve reaches the setting of the
unloading valve 226, the output from pump 216 is un
loaded through this unloading valve 226 to drain and the
the same time, oil on the opposite sides of these pistons
pass through ‘line 272a, and port 271a to drain 228. As
a result, the apron or wing 51a is elevated along with
the wing or apron 51.
When both rising aprons 51, 51a reach the assumed 15°
angular position with reference to the horizontal, their
bars 211 (FIG. 6) simultaneously engage and move the
movable contacts 280 and 234 of their switches 212 and
212a, respectively. This, of course, breaks the above cir
cuits but these circuits are immediately re-established
by the closing of the movable contacts 281 and 285 which
are respectively coupled to move with these movable con
tacts 28d ‘and 284. Thus, the now open contact 286* is
bypassed by the wire 292, ?xed and closed contacts 293
clamping pressure is determined by the setting of the un 15 and 285 of the switch 212a and wire ass so that the
energization of the solenoid 259 is continued to hold the
loading valve 226.
spring centered solenoid valve 258 in posit-ion to maintain
Since both the mandrel 129 and its supporting beam or
the dew of oil to the bottoms of the cylinders lost in lift
plate 54 are of relatively thin plate-like form, it is ap
ing the aprons 51. Similarly, the now open contacts 234
parent that they would be subject to lateral distortion if
unbalanced pressures were initially applied by the aprons 20 and 233 are bypassed by the line 237, closed contacts 281
and 2% of the switch 212 and line 239 so as to main
51, 51a. Accordingly, it is desirable that during the ?rst
tain the solenoid 259 energized and thus continue to hold
15° or so upward movement of each of these aprons
the spring centered solenoid valve 289:: in position to
in bending the workpiece 55, that they be coupled to
deliver oil to the bottoms of the cylinders 169a and
gether, in particular that neither wing nor apron exweds
this approximate 15° movement until the other wing or ' continue the rising movement of the apron or wing 51a.
Assuming that the ?nal product from the workpiece 55
‘apron has reached a substantially similar angular posi
is to have a 99° bend, each apron 51, 51a would produce
tion.
‘a 45° bend with reference to ‘the horizontal and to pro
In the normal operation of the brake, the operator
duce such 45° bends by both aprons 51, 51a the pointers
would press and close both of the switches 26% and 26%
to initiate the simultaneous initial upward movement of 30 2638, FIG. 6, will have been each set to “45” on the scale
2%. This is done by loosening the set screws 2% for each
both aprons 51 and 51a to their 15° positions and beyond.
sleeve 198 and moving each sleeve vertically until its
So closing this switch 260 energizes the solenoid 259 of
pointer 2&8 is in register with “45” on the scale 2%
the spring centered solenoid valve 258 so as to bring its
following which the set screw 2% is retightened. With
port 263 between the lines 255 and 264 and so as to
such adjustment of the sleeves 193 with reference to the
bring its port 271 between the line 272 and the drain 228.
wires 19:. which wind around the segments 1%, FIG. 5,
This circuit so energized by the closing of the switch 269
on the knuckles of the two apron's?l, 51a, as these aprons
comprises the switch 26%, ?xed con-tact 291 and movable
reach their 45° position, as illustrated in FIG. 11, their
contact 280 of switch 212, wire 2-36, solenoid 259 and
wires 1% move their sleeves 198 to a posit-ion where their
Wire 2622 through the solenoid 261 to the other side
stops or cams 2h? trip the two switches Zdt}, 21%, FIGS.
of line. Accordingly, so closing this switch ass also ener
6 and 8.
gizes the solenoid valve 233 so as to move its port 234
When this occurs the solenoids 274 and 2740 are
out of register with the line 232 and drain 22% and hence
energized to connect the oil supply lines 255 and 255a to
devent this last line to direct oil through the valve 253.
the lines 2'72 and 272a, respectively, the closing of these
Accordingly, oil under pressure from the branch ‘line 255'
electrical switches 21%, Elihu also energizing the solenoid
of the oil supply line 231 ?ows through port 253 and line
264 to the bottoms of the cylinders its? so as to retract
their pistons and piston rods 16%. At the same time, il
on the opposite sides of these pistons escapes through
2-61 of the solenoid valve 233. This establishes a regen
erative circuit to permit the aprons 51%, 51a to return on
the effective area of the piston rods 163, Edda. Thus,
pressure so established on the inlet side of the solenoid
line 272 and port Z’ill to drain 228. As a result the apron
50 valves 253, 2538a is app-lied through ports 276, 276a and
51 is raised.
Again, when the pres-sure of the unloading valve 226 is
reached, the output of pump 216 is again unloaded
through this valve to the drain 228 and only the pump
218 is operative.
It has been assumed that the operator simultaneously
closes switches 260 and 26% and with such closing of
the switch 26th: the spring centered solenoid valve 258:;
lines 2723, 2720, respectively, to the full area sides of
the pistons 169, 16%. This oil is in part supplied from
the piston rod sides of these pistons through the lines
264, 264:: and 267, 267a. Holding circuits and limit
switches (not shown) are of course provided'to complete
the return movement of the aprons 551, 51a and to de—
energize the solenoids 261, 274, 274a at the completion of
is actuated in the same manner as closing the switch 260
the return‘ movement of those aprons, a simpli?ed elec
of the spring centered solenoid valve 258a so as to bring
its port 263a between the lines 25%;; and sea-a and so as
switch 246. Accordingly, the solenoid Z45is energized
trical circuit being illustrated for clarity.
actuates the spring centered solenoid valve 253. Thus,
The operator then opens the switch 237 and closes the
so closing the switch 26% energizes the solenoid 259a 60
to move the spring centered solenoid valve 223 to con
uect the lines 222 and 243 through the port 24% and to
to bring its port 271:: between the line 272:: and the drain
connect the lines 239 and 231 through the port 25%. Ac
228. This circuit so energized by closing of the switch
26% comprises the switch 269a, ?xed contact 38 and 65 cordingly, oil under pressure ?ows from line 222 through
port 249 and line 243 to the top sides of the cylinders
movable contact 234 of switch 212a, wire 28.9, solenoid
ss to move the pistons 68 downwardly. The oil from
259a and wire 262 through the solenoid 261 to the other
the undersides of these pistons-escapesthrough the line
side or" line. Accordingly, so closing the switch 26%
239, port 250, line 231 and port 234 of solenoid valve
also energizes the solenoid 233 so as to move its port
'
'
234 out of register with the line 232 and drain 223 and 70 233 to drain 228.
This moves the outboard arms 70 of the bell crank levers
hence devent this last line to direct oil through the valve
71 downwardly to lift the clamping ram 53 through the
258a. Accordingly, oil under pressure from the branch
link 84. Accordingly, the mandrel 126' is lifted from the
line 255a of the oil supply line 231 ?ows through port
clamping engagement with the workpiece 55, a complete
263a vand line 264a to the bottoms of the cylinders 16%
so as to retract their pistons and piston rods 16-8. At 75 sequence of the operation-0f the brake having completed
3,078,903
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11
and the parts being returned to the position assumed at
the start of the description of operation.
The feature of the present invention resides in the pro
vision of the switches 212 and 212a to prevent either
apron from going beyond approximately a 15° angular
position before the other apron has reaced such position.
be formed and said aprons including working surfa es
parallel and adjacent said forming axis, a clamping ram
movable on said frame along said plane toward and from
said working surfaces in opposed relation thereto, a
mandrel carried by said clamping ram and having an ex
terior forming portion arranged to be brought into con
centric relation with said forming axis by the movement
This could occur if the operator should close, say, the
of said clamping ram, and supporting pivot means on said
switch 260 but fail to close the switch 260a. Under such
frame concentric with said forming axis at opposite ends
a circumstance, the wing or apron 51 would, if not pre
vented by the switches 212 and 212a, continue to rise with 10 of said aprons; the combination therewith of means avoid
ing distortion of the work or mandrel as a consequence
the other apron 51a still in its bottom position and on
of one apron swinging beyond a predetermined minimum
exceeding the 15° angularity at the left side, as illustrated
angular position before the other apron has reached such
by the dotted line position of the workpiece 55 in FIG. 7,
minimum angular position, comprising means severally
would exert sidewise pressure on the workpiece 55 which
would be unopposed at the other or righthand side of
swinging said aprons about said forming axis, and means
responsive to the movement of each apron and control
the mandrel 120. As a result, the workpiece could slip
ling the movement of the other apron to compel both
sidewise under the nose 121 of the mandrel to result in
aprons to reach said minimum angular position jointly.
an imperfect product. Also, since the mandrel 120 is in
2. In a brake for forming metal plate and sheet work
the form of a vertical blade, the mandrel can easily be
bowed or bent laterally to the right, again resulting in
pieces having a frame, a pair of forming aprons arranged
an imperfect workpiece. Such strain on the mandrel
in face-to-face relation on opposite sides of a plane which
includes the forming axis about which the workpiece is
could also break or put a permanent bend in it.
To avoid this, assuming the operator closes the switch
to be formed and said aprons including working surfaces
parallel and adjacent said forming axis, a clamping ram
260 but fails to close the switch 260a, when the wing or
apron 51 reaches a 15° angular elevation, its cam bar 211 25 movable on said frame along said plane toward and from
(FIG. 4) engages and moves the movable contact 280 of
said working surfaces in opposed relation thereto, a man
drel carried by said clamping ram and having an exterior
the switch 212 so as to cause this contact (FIG. 8) to
forming portion arranged to be brought into concentric
leave the contact 291 and the movable contact 281
coupled therewith to engage the contact 2%. Breaking
relation with said forming axis by the movement of said
the circuit through the movable and ?xed contacts 280 30 clamping ram, and supporting pivot means on said frame
and 291 deenergizes the solenoid 259 so that the spring
concentric with said forming axis at opposite ends of said
centered solenoid valve 258 returns to its centered spring
aprons; the combination therewith of means avoiding dis
loaded position illustrated in which the lines 264 and
tortion of the work or mandrel as a consequence of one
272 to and from the cylinders 169 for the apron or wing
apron swinging beyond a predetermined minimum angular
51 are blocked off so that this wing is held in this 15° 35 position before the other apron has reached such minimum
position.
angular position, comprising means severally swinging
The operator, observing the brake coming to a halt, now
closes the switch 260a which he inadvertently failed to
close. This establishes a circuit through the now closed
contacts 288 and 284 of the switch 212a to energize the
solenoid 259a and shift the spring, centered solenoid valve
258a to admit oil to the bottoms of the cylinders 169a and
lift the wing 51a, all as previously described. When the
said aprons about said forming axis, and means responsive
wing 51a reaches the assumed 15° position, through its
to the movement of each apron and controlling the move
ment of the other apron to prevent movement of said
other apron beyond said minimum angular position until
the controlling apron reaches said minimum angular
position.
3. In a brake for forming metal plate and sheet work
pieces having a frame, a pair of forming aprons arranged
cam bar 211 it lifts and opens the movable contact 284 of 45 in faee-to-face relation on opposite sides of a plane which
the switch 212a but this does not interfere with the con
includes the forming axis about which the workpiece is to
tinued upward movement of the apron or wing 51a be
cause the now closed contacts 281 and 290 bypass this
opened contact 284 and maintain energization of the
solenoid 259a to hold the spring centered solenoid valve
258a in position delivering oil to the bottoms of the cylin
ders 169a so as to lift the wing ‘51a associated with these
cylinders. It will also be observed that this lifting of the
contact 284 of the switch 212a brings the movable contact
285 coupled therewith into engagement with the ?xed con
tact 293. Accordingly, the apron 51, which was halted
at its 15° angular elevation, again begins to rise, this be
ing effected by the energization of its solenoid 259 through
the circuit comprising the closed switch 260, wire 292,
be formed and said aprons including working surfaces
parallel and adjacent said forming axis, a clamping ram
movable on said frame along said plane toward and from
said working surfaces in opposed relation thereto, a man
drel carried by said clamping ram and having an exterior
forming portion arranged to be brought into concentric
relation with said forming axis by the movement of said
clamping ram, and supporting pivot means on said frame
concentric with said forming axis at opposite ends of
said aprons; the combination therewith of means avoiding
distortion of the work or mandrel as a consequence of
one apron swinging beyond a predetermined minimum
angular position before the other apron has reached
closed contacts 293 and 285 of the switch 212a, wire 286, 60 such minimum angular position, comprising means sever
solenoid 259 and line 262 through the solenoid 261 to the
ally swinging said approns about said forming axis, means
other side of the line. Accordingly, both aprons 51, 51a
arranged to stop each of said aprons when it reaches said
continue in their upward movement until stopped by the
minimum angular position, and means actuated by each
settings of their cams 209 as previously described.
‘apron on reaching said minimum angular position and
It will accordingly be seen that the present invention
releasing said stop means of the other apron thereby to
provides a very simple, mechanism for insuring that neither
permit both aprons to swing beyond said minimum an
apron 51 nor 51a can rise‘above a selected angular posi
gular position.
tion, such as the 15° position mentioned until the other
4. In a brake for forming metal plate and sheet work
wing has reached such position thereby to avoid imperfect
pieces having a frame, a pair of forming aprons arranged
work and possible injury to the mandrel.
70 in face-to-face relation on opposite sides of a plane which
What is claimed is:
includes the forming axis about which the workpiece is
1. In a brake for forming metal plate and sheet work
to ‘be formed and said aprons including working surfaces
pieces having a frame, a pair of forming aprons arranged
parallel and adjacent said forming axis, a clamping ram
in face-to-face relation on opposite sides of a plane which
movable on said rame along said plane toward and from
said worl-zinrr surfaces in opposed, relation thereto, a man
includes the forming axis about which the workpiece is to
3,078,903
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13
'drel carried by said clamping ram and having an exterior
forming portion arranged to -be brought into concentric
relation with said forming axis by the movement of said
clamping ram, and supporting pivot means on said frame
concentric with said forming axis at opposite ends of said
aprons; the combination there-with of means avoiding
actuating said second switch means to deactuate said one
apron valve when said one apron reaches said minimum
angular position, second means responsive to the move
ment of the other apron and actuating said second switch
means to deactuate said other apron valve when said other
apron reaches said minimum angular position, and third
distortion of the work or mandrel as a consequence of one
switch means arranged to reactu-ate both of said valves
apron swinging beyond a predetermined minimum an
gular position before the other apron has reached ‘such
position.
minimum angular position, comprising hydraulic means 10
swinging each of said aprons about said forming axis and
including a solenoid valve ‘controlling the ?ow of pres
surized hydraulic ?uid, ?rst electrical switch means ar
ranged to actuate each of said valves, second electrical
switch means arranged to deactuate each of said valves
?rst means responsive to the movement of one apron and
when both of said aprons reach said minimum angular
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,501,241
2,651,349
Shaw ________________ __ Mar. 21, 1950
Smith _______________ __ Sept. 9, 1953
2,716,436
Cady _______________ __ Apr. 30, 1955
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