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Dec. 31, 1946.
Filed Oct. 9, 1943
4 Sheets-Sheet l
117$ J_'
> <71?
Raév/z M. Slzaw, e52,
Dec» ‘31, 1946-
Filed Oct. 9, 1945
4 Sheets-Sheet 2
20 1'2 1}
» 4a
.55 55 322,34;
" 31a
51, 3”
4” 5% 32a 55a 35a
27 7515 19 221 26a
Dec. 31, 1946.
Filed 001;. 9, 1943
4 Sheets-Sheet 3
Zia" -
45c —
Filed 00%. 9, 1943
4 Sheets-Sheet ‘4
I? I
Patented Dec. 31', 1946
Ralph Ml
N; J l, as
signor to Pedrick‘ vTool & Machine Company;
Philadelphia, Pa~., a corporation of ‘Pennsyl
Application October 9, 1943,;Serial'No.—505,634
(Cl. 153*46)
s‘tu’d'lqrpost Maud arranged at opposite sides of
the clamp arrnl 5 are arms 221v vandZlia which are
right Lanldleft counterpartsof each other. The
particularly in bending metallic structural bars
or rods ofdi?erent cross section, pipes, tub'es,_et'c.,
and has reference more‘ speci?cally to bending"
machines of the table type such as disclosed in
U. S. Patent No. 2,266,912,‘ granted to machine"
cember 23, 1941.
cured. in the machine. Also fulcrumed' on the
This invention relates to machinesuseful more‘
arm 72'2'v has’ parallel longitudinally“-extending
dove-tail slots 23 and 24 for guidance of blocks
25and'2'61 which .are adjustable along said slots
by screwspindles 2.1fandlz?'re'spectively. Mounted
The chief aim of my present invention'ifs to
on'the block 25. is avertical axis grooved. roller
enhance the utility of’ bending machines of the‘
kind referred to,i. e., to enable formation ofcom 10 3'! which-is adapted'to engage one side edge of
plex and irregular‘ bends of different radii in one
operation, as well as circularv bends of’ different
constant‘ radii, without'necessitating die inter
changes or‘ substitutions of otherv parts of such
thebar/B; while a-pairof similar groovedrollers
3'2‘and 33 freely rotatable respectively about studs
34 and v3.5 upstanding from the blookZ-ii, engage
the- other sideedge of thebar BI ‘It is to-be noted
that, wheniin. operativeposition, the rollers 3i
and 3.2 engage the bar B at diagonally opposite
Another‘ object of this‘inve‘ntion is to effect'tli‘e
points,~_ while the. ro1ler._Z=f2v islaterally spaced at
bending'of bars and the like mainly by compres
a?xeddistance-from the roller 3|’ inra plane at
sive action,,and‘ substantially without any defor
right angles toithe armil. At its outerv end the
mation oftthe' original'cross-secti'on.
How the foregoin'glan'd‘ other objects and ad‘ 20 arm‘ .22ihas-an apertured lug projection-3:65 for
passageofla latch pin 37. wherebyit may bese
vantages are readily realized in practice willap
cured‘ to the turn-table H for movement by the
pear from the follo‘wing'det‘ailed description of the
latterabout the stud‘ [4. For. the purpose offp'osi
accompanying drawings; wherein
Fig: 1 is‘a fragmentary view in'plan‘of one‘ . may driving; the roller 3|, during certain bend
25 ing operations, there. is provided-ayariable speed
embodiment of my improved bending'fmachine';
electric motor “which. is?xedly supported-by
Figs. 2, 3 and4 are fragmentary sectional views?
the,_bl'oc_k~2-5 and-which has amit'er gear pinion
taken as‘ indicated respectively by the angled air‘
391 on it's shaft in meshiwithacompanion miter
r0WsfII-_—II,'.III—III and‘ IV—IV in Fig. 1'.
pinion 4'llilafflixedlto said roller, The arm 22a is
Fig_'j5 is‘ a view‘corresponding to Fig". 1, showing
an‘ alternative embodiment of my invention; and" 30 equipped with, a group of grooved instrument-ali
ties which are identical‘ with those‘ above de
Figs.‘6; '7V and 8 are‘ diagrammatic'views in top‘
plan_ showing how complex bends of changing;
scribed‘ in' connection with the arm :22‘ but re
1-4; the bending machine'there shown‘ comprises"
a circular" bed ID which is recessedfor ?ush're
ience of-more-ready distinction. For operation
upon‘ a bar B of ?at rectangular cross'sec‘t'ion such
versely- arranged,- the corresponding. parts being
curvature can be made with‘ a machine of'my in
identi?e'dlby the same reference numeralswith
With' reference ?rst more especially 1 to" Figs‘; 35 the letter‘ a added'in each instance tenemen
cepti'on of a' turnetable' in the form‘ of a disk? I I‘
1 as the one illustrated-the rollers 3%, Sta and-‘32,
bed‘. Suitably ?xed'in the bed 10 vis ‘a studor'p'o’s't'
32'a'nare con?gured as in‘sta'nced' inFig. 4', i'.f.e.,
provided? with‘ circumferential grooves. of rectan
gular pro?leit‘o correspond accurately ‘with-the
M which extends upwardly through a" central apl
cross section of said bar."
erture in the turn-table ll“. Fulcrumedon the
stud or post I4 is an arm. l5"whichrea'chesfto the‘
marginal surface'o‘f. the‘ bed‘. In where it‘is' ?x‘ablev
anfdjSl'a areiadjusted‘alonfg‘the ‘arms 22 and 22a
relative to'the axis's'tudior‘p'ost war the machine
having peripheral teeth l2‘ in‘m'eshing engage
ment‘ with a drivin'g'pinion l3 journaled inisaid
against turning ‘about’ said‘ stud by: a‘ removable
latch pin“ l6‘ which is selectively 'engag'e'ablefwith
socket apertures at intervals‘circumferenti'ally'of"
said bed; As" shown, the arm [5‘ has a longitudi
nally-extending‘doveetail slot "along which a
In preparation" for the- bending, the‘ rollers 3i
by means of the screw spindles ‘2'1. and 121av in ac
o'o‘rfdali‘ce"with"a the radius of the curvature ‘de
sired,‘ whereupon-the’clamp'block. It is shiftediin
wardlyalongit's} ‘arm, labyimeans of. the screw
spindle‘ ,l 9“ to bifin'g'th'e' inner? edge of' the} bar ‘13
block I8 is“ adjustable by‘means ‘of ' a screwspin'dle‘
into the" grooves'ofsaidrrollerstlf and 35d. 'The
l9. Incorporated with the'lolo(_:k'l8v is a holding‘
blocks‘? 6 . and 2 6a" are rie'xtshifte'd ‘inwardly along
the arms: 32' and 22a'jrespectively' by? means-of
means in the'form of a quick-releasable manually
the adjusting“ screwszs; 23a to‘ time: the‘ rang-G
operable clamp 2?‘by? which at ?at ba‘rB of ‘rec'
tangular cross section which is to bebe'nt' is'js‘e-f 55 ' 3'2; swamps", sad‘i‘ntb,en'gagement‘withthe outer
edge of the bar B. With the parts thus set, the
roller arm 22a free, the clamp arm I5 secured
against rotation by the latch pin is and the roller
bends. Accordingly, under these circumstances
the bending is accomplished with little or no
change in the cross section of the bar from its
original form and dimensions.
The alternative embodiment of my improved
bending machine illustrated in Fig. 5 is generally
arm 22 locked to the turn-table H by the latch
pin 31, said table is rotated in the direction of
the curved arrow in Fig. 1. As the arm 22 moves
with the turn-table I l for example to the position
in which it is shown in dot-and-dash lines, the
end portion of the bar B below the clamp arm It
as viewed in Fig. 1 is bent at X by the cooper
ative action of the grooved rollers 31 and 32, the
roller 33 serving to keep said bar con?ned to its
original plane. For a short bend, the roller 3!
may be allowed to roll freely through traction
with the inner edge of the bar B. However, for
larger bends up to a semi-circle, the roller 3| is
positively driven in the direction'cf the arrow
thereon by the motor 38 at a speed somewhat
similar to that of Figs. 1-4, having two arms 22c
and 22d respectively with grooved rollers 3lc, 32c,
faster than it would ordinarily rotate by traction
with the bar B so as to effect a smoothing of the
metal of said bar and thereby prevent ?attening
33c and 3Id, 32d, 33d, but being devoid of the
clamp arm t5. Another di?‘erence to be noted
is that the end lugs 36c and 36d of the arms are
each provided with two apertures so that they
may be locked either to the machine bed l?c or
to the turn-table He by means of the latch pins
31c, 37d for the reception of which said bed and
said table are respectively provided at suitably
spaced circumferential intervals with socket holes
43 and 415. It will be further noted that here,
the adjusting screws 21c, 21d and 28c, 28d have
secured to them spur gear pinions 45c, 46c and
‘45d, 46d respectively with which idler pinions
of the bend as the roller arm 22 continues its
41c and 41d slidable on studs 43c and 48d at the
movement in the direction of the curved arrow
outer ends of the roller arms 22c and 22d are
in Fig. 1 beyond the dash-and-dotted line po
meshed at certain times for a purpose presently
sition. The other end portion of the bar B can 25 explained. All other elements in the alterna
obviously be bent in a like manner until a com-'
tive embodiment not speci?cally referred to but
plete circle is formed. In preparation for the lat
having their counterparts in the ?rst embodi
ter bending step,'the latch pin 31 is withdrawn
ment are, in order to preclude the necessity for
to free the arm 22 and used to lock the arm 22a
repetitive description, identi?ed by the saine'nll
to the turn-table II which is thereupon rotated
merals but di?erentiated by use with them of the
in the direction opposite to that indicated by the
letters 0 and d.
curved arrow in Fig. 1.
The radius of the bend in all cases is deter
mined by the distance of the rollers 3i and am
from the axis of the machine and not on the ,
distance of the rollers 32 and 33 from the rollers
32a and 33a, and is independent of the dimen
sions of any of said rollers. The spacing of
the rollers 32, 33 and 32a, 33a is for the purpose
The procedure followed in making bends of
changing curvature in one operation in the alter
native machine of Fig. 5 is as follows: In prep
aration, the arm 22d is secured against rotation
to the machine bed I?c by the latch pin 3112,
with the arm 22c positioned alongside it and
secured to the table He ‘by the latch pin 370.
The rollers 31c and 3ld are next adjusted to the
of changing the leverage, thereby to minimize 40 desired positions along the arms 22c and 22d;
?attening and wrinkling of the work or bar B
as it is being bent, the rollers 33 and 33a serving
to convert the single ?xed loading of each of the
rollers 32 and 33a into uniform distributed load.
The machine thus di?ers from the usual forms
of roller benders since the arrangement of the
roller assemblies is non-pyramidal. The use of
two arms 22, 22a as herein shown in especially
advantageous in that it allows bends to be made
in different planes. By suitably shaping the jaws .
of the holder clamp 26 and the peripheries of the
grooved rollers 3l-33 and 3la—33a, the machine
can of course be adapted to bending bars of cross
sectional shapes other than the one herein shown
by way of example.
By reference once more to Fig. 1, it will be noted
that the elements 3| and 31a function as progres
the bar B engaged with said rollers; the rollers
32c, 33c and 32d, 3311 are then moved inward of
said arms to engage the outer edge of said bar,
and the spur pinion ll‘lc shifted into mesh with
pinions 45c and 410 on the spindles 27c, 280 of
the arm 220. All being now in readiness with
the bar B held by the rollers of arm 2211, the
table I I0 is rotated in the direction or the curved
arrow in Fig. v5 through a distance say of ninety
degrees, whereby the arm 220 is moved to the po
sition in which it is shown in Fig. 6 to form the
bend X’ in the bar B, after which said arm is
latched to the bed lllc. With this accomplished,
the arm 22d is pinned to the bed l?c'as likewise
shown in Fig. 6 and moved to the position in
which it is shown in dot-and-dash lines in the
last mentioned ?gure by further rotation of the
sively moving die points with the elements 26, 33
bed in the same direction as before, and ?nally
and 26a, 33a constituting correspondingly moving
re-latched to the bed l 00 to hold the bar B at the
points of application of the forces by which the 60 terminus of the bend X’ just completed. The
bar B is pressed toward the elements :3! and SI a,
arm 220 is thereupon again latched to the table
and moreover that the bending force or torque
He and the latter further turned still in the
of the machine transmitted to the elements 26,
same direction to move the arm 22c say to the
33 and 26a 33a operates against a leverage arm
position in which it is shown in Fig. '7 and then
equal to the distance between the axes of the 65 latched tothe bed I00 and the arm 22d latched
elements 26, 26a‘and the elements 3|, 3111' re
to the table I la. The table He is then turned
spectively. The bending is therefore accom
still further in the same direction to bring the.
plished by compression rather than by tension,
arm 22d alongside the arm 22c and thereafter
with the neutral axis of the bar B lying outside
latched to the bed Hlc to hold the bar B at the
of the center of gravity. In other words as the
terminus of the now completed second portion
bending is progressively effected by coaction be
tween the moving groups of elements 26, 3|, 33
and 26a, 3m, 33a, the bulk of the bar B is sub
jected to compression without any substantial at
X2 of the bend.' Thereupon the arm 220 is re
latched to the turn-table He, and the latter
turned still further in the same direction to.v
bring said arm to the position say in which it is
tendant tensioning of the outside portions of the 75 shown in Fig. 8, the rollers 3| c, 320 and 33c'being'
incidentally moved inward of the arm'ZZc. pro
gressively by: turning‘; of one of the, spindles‘. 21c
and 280? (the other spindle- being obliged to fol-1
low' suit‘ by reason of being connected ‘by the
gears-45c; ‘46c and 410), with the result that a
sharper curve is formed in the bar vB as shown
atTX3~1in Fig. 8. ' These settings and operations
are repeated asoften as necessary depending upon
lyiturn'tby traction with’ said bar duringv the
- 7. In: aamachine 'for'bending bars andvthe like,
a. bed; az?xed: studzupstanding fromsaidi bed;
a peripherally-toothed turn-table with means
whereby it.-,is,=~rotatable about said: stud; anarm
tul'crumed'. on ‘the; studand carrying'more than
tWOxliOllGl‘S setto. engage the outer and the inner
sidesoit'heban at diagonally related points; an
thefshaping desired} in the barv B; and it is to be
understood; that,¢.by”like manipulations and selec 10 otherearm" with means thereon: for holdingthe.
bar-during the bending operation; means where
tivev use of the two. arms22c, 22d, the other end
by the ?rst mentionedarm; can. be releasably se
vportion of the bar may be similarly ,or di?er
cured to the turn-table for'rotation thereby; and
entlyl‘ bent ‘through curvatures of changing radii.
means whereby the second mentioned arm can be
To facilitate complex bending operatings of the
kind just described, I provide templates such as 15 releasably connected in different positions around
the bed beyond the periphery of the turn-table.
the one shown at 50 in Figs. 6-8 to de?ne the
8. A bending machine according to claim 7,
lines along which the bends are to be made. The
further including means whereby the several roll
template 50 may be in the form of a suitably
pro?led plate capable of being removably secured
against rotation in the machine to the top of
ers and the holding means can be adjusted along
20 their respective carrying arms.
two rollers supported by the arm to one side of
9. In a machine for bending bars and the like,
a bed; a ?xed stud upstanding from said bed; a
turn-table rotatable about said stud; an arm ful
crumed on'the stud and having means thereon
for holding the bar during the bending; a pair
of arms independently fulcrumed for movement
about the stud, and each carrying a pair of rollers
set to engage the bars at diagonally opposite
points, the rollers of one of the latter arms being
along said arm to engage opposite sides of the
bar at diagonally related points, as considered
with respect to the fulcrum, with one of said
rollers serving as a backing means beyond the
others and also to con?ne the bar to its original
plane; quick-release holder means for ?xedly
supporting the bar during the bending operation;
other arm of the pair; means whereby the holder
arm can be releasably secured in different posi
tions around the bed beyond the periphery of the
turn-table; and means whereby each arm carry
ing a pair of rollers can be releasably secured se
lectively to the turn-table for individual rotation
thereby relative to the holder arm.
the stud I40 above the roller arms 22c and 22d.
It is of course within the province of my inven
tion to substitute power means for actuating the
spindles of the arms 22c and 2211 in lieu of the
hand wheels herein shown by way of example.
Having thus described my invention, I claim:
1. In a machine for bending bar and the like,
an arm movable about a ?xed fulcrum; more than
said fulcrum and relatively adjustable directly 30 reversely arranged with respect to those of the
10. A bending machine according to claim 9,
and means operatively-coordinated with one of
further including means whereby the rollers, and
the rollers aforesaid for moving the arm about
the bar holder means can be individually adjust
its fulcrum relative to said holder means.
ed along their respective supporting arms,
2. A bending machine according to claim 1,
11. In a machine for bending bars and the like,
further including means whereby the spaced roll
a stud upstanding from the bed; a cir
ers can be simultaneously adjusted along the sup
cumferentially - toothed
porting arm; and means whereby the bar holder
means whereby it is rotatable about said stud; a
means can be correspondingly adjusted radially 45 pair of arms fulcrumed for independent move
of the fulcrum of said arm.
ment about the stud, each said arm carrying
3. A bending machine according to claim 1,
bending instrumentalities for engaging the bar
wherein the roller supporting arm rotatively in
from opposite sides at diagonally opposite points;
cludes a pair of longitudinally-extending adjust 50 and means whereby said arms can be selectively
ing screw spindles; wherein followers on the said
coupled either to the bed or with the turn-table
screw spindles respectively carry an individual
so that one may be employed as a ?xed holder
and plural rollers; and further including means
for the bar while the other is moved to effect the
whereby the bar holder can be adjusted radially
of the fulcrum of the arm to correspond with 55
12. In a machine for bending bars and the like,
adjustments of the spaced rollers.
a bed; a stud upstanding from the bed; a turn
4. A bending machine according to claim 1,
table rotatable about said stud; an arm fulcrumed
further including a backing means for contacting
on the stud, said arm carrying a pair of rollers
one side of the bar at a point beyond one of the
set to engage the outer and inner sides of the bar
spaced rollers transversely of the supporting arm;
60 at diagonally opposite points, a backing means
means whereby a pair of the rollers together With
effective to contact the outer side of the bar at a
the associated backing means, can be independ
point beyond the outer of the pair of rollers and
ently or simultaneously adjusted along the sup
transversely of the arm; a second arm similarly
porting arm; and means whereby the holder
fulcrumed on the stud and having rollers and a
means can be correspondingly adjusted radially 65 backing means like that of the ?rst arm but re
of the fulcrum of the supporting arm.
versely arranged thereon; and means whereby
5. A bending machine according to claim 1,
said arms can be selectively coupled either with
the bed or the turn-table so that one may be em
wherein a variable speed motor is provided to
ployed as a holder for the bar while the other is
drive one of the spaced rollers in the direction
it would naturally turn by traction with the bar 70 moved to effect the bending.
13. A bending machine according to claim 12,
during the bending operation.
further including means whereby the roller and
6. A bending machine according to claim 1,
the backing means assemblies can be adjusted
wherein a variable speed motor is provided to
along their respective carrying arms to vary the
drive the spaced roller which engages the inner
side of the bar in the direction it would natural 75 curvature of the bending.
14. A- bend'i'ng machine according to claim 12,
further including separate variable speed power
means for rotating the inner rollers of the re
spective arms when they are individuallyv em
ployed to e?ect the bending operation.
15. A bending machine according to claim 12,
further including a template peripherally con?g
ured in accordance with the shaping desired in
the bar, said template being detaohably secur
a ?xed fulcrum, a lever arni movable about the‘
fulcrum, said arm carryingmore than-two cir
cumferentially-grooved rotatable elements in
cluding one element for engaging the inner side
of the bar at a single point, and the other ele
ments for engaging the outer side of the bar at a
point beyond the region of contact of the bar by
the ?rst mentioned element; means for holding
the bar against displacement in the machine dur_
able to the fulcrum stud above the two arms for 10 ing the bending; means for adjusting the respec_
service as'a guide'in adjusting the respective roll
er assemblies during the bending.
16. In a machine for bending bars and the like,
tive bar engaging elements along the lever arm;
and means for moving the arm.
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