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Jan. 14, 1947. _
l2,414,151 i
Filed MayÍs, 1944
(MW ÍM5@se.
Patented Jan. 14, 1947
Albert Hossfeld, Winona, Minn.
Application Mil-y 3, 1944, Serial No. 533,963
1 Claim.
My present invention relates to improvements
in iron bending machines of the type disclosed
and broadly claimed in my United States Letters
Patent No. 1,832,210, issued November 17, 1931,
(Cl. 153-45)
block I4, the front and back thereof being on
arcs of circles that are concentric with the face
of the master die II. This radius block I4 is po
and entitled “Die for bending angle bars.”
sitioned over the work-supporting table I3 and
tegral with said block and affords a base of re
has in its back a pair of notches I5 into which
The objects of this invention are: ñrst, to pro
the wedge-acting members I2 project. The bot
vide a simple and highly efûcient machine for
toms of the notches I5 are upwardly and out
bending a ñat metal bar in the plane thereof;
inclined and slidably engage the oblique
second, for holding the bar from buckling while
bending the same; and third, to permit free end 10 under 'surfaces I5 of the wedge-acting members
I 2. On the under side of the radius block I4
wise feeding movement of the bar in the ma
is a curved rib-like stop member I 'I that is in
chine when the bending pressure is removed
sistance for a nat iron bar :v resting flatwise on
To the above end, generally stated, the inven
tion consists of the novel devices and combina 15 the work-supporting table I3 and being bent in
the plane thereof. Or in other words, the stop
tion of devices hereinafter disclosed and claimed.
member Il takes the thrust of the bending pres
In the accompanying drawing, which illustrates
sure applied to the bar x by the bending block
the invention, like characters indicate like parts
I9. This stop member I'I is on a segment of a
throughout the several views.
circle that is concentric with the front and back
Referring to the drawing:
20 surfaces of the radius block I4.
Fig. 1 is a fragmentary plan view of the imA stop block I8 on the main frame 5 is pro
proved iron bending machine, Isome parts being
vided for holding the bar a: against the stop mem
shown in section;
ber I'i and a bending block I9 is mounted on the
Figs. 2 and 3 are views in vertical section taken
on the line 2_2 and the irregular line 3-3 of 25 swinging frame I5. These two blocks I8 and I9
are identical, the one with the other. The stop
Fig. 1; and
block I 8 extends between the bars 9 and is secured
Fig. 4 is a bottom plan view of the radius block.
thereto by a pivot pin 29. This pivot pin 20 ex
The improved bending machine includes a sta
tends through one pair of a plurality of longi
tionary main frame 5 and a swinging bending
tudinally spaced holes 2l in the bars 9.
frame 6 attached to said main frame by a pivot
The bending block I9 is interposed between
pin 'I for horizontal swinging movement. Said
the bars Ill of the swinging frame 6 and secured
main frame 5 is rigidly secured to a bench or
thereto by a pivot pin 22. The pivot pin extends
other support, not shown, by a plurality of nut
through one pair of longitudinally spaced holes
equipped bolts 8.
23 in said bars.
Each frame 5 and 6 includes a pair of verti- .
As shown, the left-hand end portion of the
cally spaced fiat bars 9 and Ill, respectively. The
bar œ has been bent around the stop member
inner end portions of the bars I0 of the swing
Il on the arc of a circle havingV the same radius
ing frame B are interposed between the adjacent
as the engaged edge of said member. The other
ends of the bars 9 of the main frame 5 with a
close working fit. The pivotV pin l extends 40 end portion of the bar a: is straight. This bar :z:
rests on the work-supporting table I3 and, in
through aligned holes in the bars 9 and iû. A
turn, the radius block I4 rests on the bar :12. It is
hand lever, not shown, is attached to the outer
important to note that the radius block I4 is out
ends of the bars I9 for use in swinging the
of contact with the master die II and its stop
frame 6.
member I'I is out of contact with the work-sup
A master die II is interposed between the bars 45 porting
table I3.
I0 and pivotally secured to the pairs of bars
outer edge,
9 and I0 by the pivot pin 1. Integral with the
engages the stop block I8 and is held thereby
master die II is a pair of forwardly projecting
wedge-acting members I2. Also integral with the
master die II is a forwardly projecting work- »
supporting table I3, located bel-ow the wedge
acting members I2. The outer faces of the mas
ter die II and the outer edge of the work-sup
against the stop member I'I. The bending block
I9 is in engagement with the outer edge of the
straight portion of the bar .r and considerably
in advance of the curve in said bar.
Obviously, by pulling the swinging frame 6
toward the bar :11, said bar will be bent in the
Co-operating with the master die II is a radius 55 plane thereof by the contacting bending block
I9 around the curved stop member I'I. During
porting table I3 are on arcs of concentric circles.
In a device of the class described, a die having
bending of the bar zu, the pressure thereof on the
a work table for Isupporting thereon a flat piece
stop member I'I will force radius block I4 toward
of metal to be bent on the arc of a circle, a radius
the master die I I. As the radius block I4 moves
block overlying the table to be supported on the
toward the master die I I, the engagement of said
radius block I4 with the wedge-acting members I2 Ul bar and having on its under side a stop shoulder`
to be engaged by the bar at its inner edge, and
will force the radius block I4 downwardly onto the
holding the bar with its outer edge portion out
underlying bar œ. It will thus be seen that the
wardly of the die and the radius block, the faces
bar :l: will be tightly clamped i‘latwise between
of the die and radius block and the stop shoulder
Work-supporting table I3 and the radius block
being on the arcs of circles, the width of the stop
I4 and thereby prevent buckling of the bar :I:
A shoulder being less than the thickness of the bar,
during bending thereof.
whereby said stop shoulder is out of engagement
The above described iron bending machine will,V
with the table, a stop to be engaged by the bar
in actual usage, be provided with a plurality of
at its outer edge for holding said bar with its
radius blocks having stop members I1 of differ
inner edge against the stop shoulder, a bending
ent radii. The master die II will take care of
quite a range of sizes of radius blocks I4 from
small radii up to quite large radii.
The drawing illustrates a commercial form of
the invention, but it will be understood that the
device operative on the outer edge of the bar in
advance of the stop for bending the bar on the
stop shoulder, and means actuated by pressure
generated by bending the bar to force the radius>
same is capable of certain modifications as to de
block onto the bar and clamp the same onto the
tails of construction arrangement and combina
tion of parts within the scope of the invention
herein disclosed.
What I claim is:
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