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Патент USA US2405778

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WW8
E C R A w FO R D
DIE STRUCTURE FOR BENDING- SHEETYMETAL
Dec" 8'
2 sheetswsheet l
Q17
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110
111
,22
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IIIIIIIII/II’I’l
Y
L
V
BY
I
> . .
Ewan? {raw/bra’
Patented Aug. 13, 1946
2,465,778
UNETED STATES PATENT '
OFFICE
2,405,778
DIE STRUCTURE FOR BENDING SHEET
METAL
Francis Crawford, Scarsdale, N. Y.
Application December _8, 1943, Serial No. 513,331
10 Claims.
1
(01. 153——21)
2
The present invention relates to die structure
different known types of embossed ?oor plate
stock which may be accurately bent with the
employment of die structure of the present in-’
for bending sheet metal and the like, such as em
bossed metal or steel-?oor plate.
'
A general object of the present invention is to
provide efficient cooperating male and female dies
or, more speci?cally, a male die structure which
will permit the ready, accurate and economical
formation of bends in sheet metal such as em
vention;
_
Figs. 2 and 4 are sectional elevations of the em
bossed ?oor plate stocks shown respectively in
Figs. 1 and 3, with Fig. 2 taken on line 2—2 of Fig.
1 and Fig. 4 taken on line 4-4 of Fig. 3; » _
bossed floor plate in predetermined locations
while avoiding undesirable lateral shifting of the *
sheet metal regardless of face contour thereof 7
during the bending operations.
A more speci?c object is the provision of a
simple and effective male die structure which in
cludes a plurality of prick-punches extending a
'_
Fig. 5 is an elevational sectional View of male
and female die structure of the present invention
showing in section a piece of embossed ?oor plate
held therebetween in a predetermined position for
the accurate formation of a bend in the plate; .
Fig. 6 is a side elevational view of the struc
ture shown in Fig. 5, with parts of the dies broken
relatively short distance from the working sur
away and showing the piece of floor plate sec
- face to be engaged into the stock of the sheet
tioned
along the line on which it is to be bent;
metal accurately to hold it in position as a bend is
Fig. '7 is an end elevational view of die struc
died therein, and'its combination with cooperat
ture similar to that shown in Figs. 5 and 6, show
ing female die structure.
20 ing in section a piece of embossed floor plate to
Another object of the invention is to provide
be bent located between the dies in reversed posi
such die structure whereby in the formation of
tion; and
>
I
bent sheet metal articles necessity for prelimi
Fig. 8 is a side elevational view, with parts
narily cutting stock oversize, then bending and
‘ broken away, of the die structure shown in Fig. 7,
?nally trimming to dimension resulting-in loss of
showing the floor plate sectioned along the line,
material is efficiently eliminated.
such as line M of Fig. 3, on which it is to be bent.
Still another object of the invention is the pro
Prior to the present invention it has been
vision of such male die structure wherein a plu
deemed by those skilled in the art of handling
rality of sockets are provided removably to re
and bending embossed ?oor plate stock to be im
ceive alternatively prick-punches and properly 7‘ practical
or impossible to cut the stock to accu
shaped plugs to permit employment at will of as
rate
dimensions
and then to form a desired bend
few or as many work-locating prick-punches and
in the accurately dimensioned pieces along a pre
any speci?c arrangement thereof as may be dic_
determined line. This is at least partially due to .
tated by a particular job while assuring smooth
the
fact that in many designs of embossed floor
substantially continuing working surfaces at 1 plates
the patterns of the bosses thereof cause
sockets where the employment of prick-punches
differing cross-sectional areas or thicknesses
is not desired.
'
along different vertical planes. This is true of
An additional object of the invention is the
the
two well known types of embossed ?oor plates
provision of structural embodiments of the ap
shown in Figs. 1 to 4, inclusive, wherein in Figs.
paratus which are readily constructed and allow
1 and 2 the “Diamonette”. and in Figs. 3 and 4
e?icient use and operation thereof.
Other objects of the invention will in part be
obvious and will in part appear hereinafter.
The invention accordingly comprises the fea
tures of construction, combination of elements
and arrangement of parts, which will be exem
pli?ed in the construction hereinafter set forth
and the scope of the invention will be indicated
in the claims.
For a fuller understanding of the nature and ‘*
objects of the invention, reference should be had
to the following detailed description taken in con
nection with the accompanying drawings, in
the “Waffle" patterns are respectively indicated.
It will readily be seen from an inspection of these
?gures that the “Diamonette” plate It and the
“Waffle” plate 1 l are Weaker along planes between
adjacent rows of their respective bosses I 2.-—|2
and. i3-—I3. .Thus in attempting to bend such
stock between male and female dies there is a
tendency for plates thereof to shift laterally to a
line of least resistance,_ or for sloping faces of the
bosses when brought into contact with'anangu
larly disposed face of the male die structure to
' cause a lateral shifting away from the line along
which it is desired to form a bend, ‘for example,
which:
Fig. 1 and 3 are top plan fragmentary views of 55 along the dot-dash line M. This problem has
become so universally accepted asbeing unavoid
2,405,778
3
able that it has given rise to a common practice
in the art of ?rst forming a desired bend in an
oversized piece of the embossed stock and then
trimming the resulting bent piece to dimension.
This, of course, causes undesirable wastage of
material and further increased costs due to addi
tional trimming operations required. These and
other di?‘icultiesv of the prior art are e?iciently
4
punches as it is conveniently possible to use on
a particular job be employed but that, when
prick-punches are omitted from certain sockets,
those blank sockets do not present sharp edges
or deforming surfaces which might tend to mar
the work and that there be no void spaces in the
die stock along working surfaces. Accordingly a
plurality of plugs, such as shown at 24 in Fig. 6,
are provided, each of which is removably- receiv
eliminated by the present invention.
In the drawings like numerals identify similar 10 able in one of the sockets and when so seated has
its exposed end contoured similarly to the con
parts throughout. In accordance with one em,
tour of the face of the male die to provide a sub
bodiment of the invention disclosed in Figs. 5 and
stantially unbroken working surface. These plugs
6, the die structure preferably‘compiises a female
24-44 are preferably formed of material similar
die l5 having an elongated groove 36 formed in
its face which groove by way of example, for the 15 to that employed in the construction of the male
die H, such as steel.
formation of a substantially sharp bend such as
It is frequently desirable to reverse the em.
at a right angle, is V-shaped as shown. A male
bossed ?oor plate when it is positioned between
die I‘! is provided to cooperate with the female
the dies, that is, with the substantially flat bottom
die l5 and it has a complementary elongated ridge
18 to cooperate with the groove l6 for the forma 20 face thereof positioned adjacent the male die,
as shown in Figs. '7 and 8. In those ?gures a
tion of a bend along dot-dash line H), for example,
typical embodiment of the invention, which has
inapiece of embossed floor plate 18.
In order to avoid lateral shifting of the piece
of embossed floor plate stock, or other sheet metal
stock, when the female and male dies i5 and H
are caused to approach each other, a plurality
of prick-punches 2il—2il>projecting a relatively
been constructed and is now in commercial use,
has been shown approximately to scale. It is in»
dicated therein that the prick-punches 29-20
extend from the edge of the bending ridge I8 less
than the thickness of the base of the plate stock.
For example, for one-eighth inch embossed steel
floor plate stock the prick-punches preferably ex
short distance from the surfaceof the ridge [8 are
employed. This is preferably accomplished by
providing a plurality of cylindrical sockets 2 €—2i 30 tend about three thirty-seconds of an inch, so
that should any prick-punch chance to be lo
along the edge of‘ the ridge l8 removably to re
cated between bosses where the stock is thinnest,
such as at 25, the prick-punch will not pierce
through. An advantage of this positioning of the
prick-punches‘ 29-49 be of such longitudinal di 35 floor plate stock between the dies is that when the
prick-punches 20-420 ?rst engage the floor plate
mension as- to project from or beyond the surfaces
as the dies are caused to approach each other
of‘ the ridge 18 only a limited distance‘ so that they
there are no‘boss sloping surfaces to be engaged
will not pierce entirely-through the sheet metal
by the tapered points of the prick-punches which
stock or embossed ?oor plate. The prick-punches
are employed merely‘ to pierce into the surface 40 might in some cases tend to cam the plate side
ways for lateral shifting thereof. Of course the
of the‘sheet metal stock or steel floor plate suf
position of‘ the floor plate stock between the dies
?ciently to anchor the plate in position to pre
frequently will be dictated by the direction in
vent the' latter from slipping or shifting laterally
ceive therein cylindrical, pointed prick-punches,
preferably formed from specially treated hard
ened steel. It is particularly desirable that the
which the bend or bends is or are to be made for
during bending operations.
The number of‘ prick-punches 21B-—20‘which' are
employed may vary'in accordance with the die
tates of a particular job or the results desired.
Accordingly, pricképun'ches‘are removably mount
edinthe sockets‘ 2 1-2 i‘ with'rather‘a tight~ fit to
assure ‘their remaining in‘ proper‘ position during
operation of the die structure.‘ Removal‘ of the
bi)
suchbend.
- prick-punches; 20'—-28' is ‘provided for by a plu
The present invention has in actual commer—
cial operations proven to be of ‘great importance
in the’ art of bending embossed ?oor plate stock
and unexpectedly‘ to accomplish desired ends
which previously had been thought by those
rality of knock-out holes'>~22—'-22 each ofv which
‘extendsthrough the body of the male die~ l'l' from
the base portion 23 ‘thereof to. one of the Sockets
2!: so‘ that a driving'rod may be received therein.
The'number'of prick-punches'is determinable by
skilled ‘in the artv of bending and handling em
the allowable-tolerances in bending a particular
sh'eetmetal stock. The more punches employed
the more accurate will be bends formed by the die
structure. It hasbeen found to be desirable to
provide a wide male die with a ' plurality of
sockets located‘ at'intervals of about three inches.
This will assure the provision of as many prick
punchesas will probably be found to be desirable
for» any particular‘ job demanding the employ
ment of a maximum-number thereof.
However, ' the fewer the number of prick
a particular job. Where the edge of a stair tread
is to be turned down to overlie the riser the plate
will be- bent in accordance with~ the teaching of
Figs. 7 and 8, but should it be desired to bend the
other edge of the plate upwardly to overlie the
succeeding riser then the other procedure pro
posed in Figs. 5'and 6 will be employed to perform
iii
bossed floor plate stock'to be'impossible of attain~
ment. The invention eliminates the necessity of
precutting pieces of‘ stock to oversize dimensions,
then bending them and ?nally trimming to ac
tual dimensions with reference to a bend or bends
formed as an intermediate step or steps.
It‘ will thus be seen. that the objects set forth
above among others are 'e?i'ciently attained and
since certain changes may be made in the above
construction and different embodiments of the
invention could be made without departing from
punches which. can be employedwhile still assur~
ingsu?icient accuracy of‘bend for a particular 70 the scope thereof, ity is intended'that all mat
ter' contained in the above description or shown
job; thatis, with-aparticular type of sheet metal
in the accompanying drawings shall be inter
stock; the‘ more‘satisfactory may be the results
preted as illustrative and not in a limiting sense.
since‘ithere will'be' less tendency for weakening
It is also to be understood that the following
of ' thestock along bend: lines, less surfacemar
claims
are intended to cover all of: the generic
75
ring, etc.
Therefore, it is’ desired that as few
2,405,778
5
and specific features of the invention herein de
scribed, and all statements of the scope of the
6
projecting a relatively short distance from the
edge of said V-shaped ridge and substantially less
invention which, as a matter of language, might
than the mentioned minimum thickness of the
be said to fall therebetween.
sheet metal to be bent to pierce into a surface of
Having described my invention, what I claim
the sheet metal without perforating it to hold
as new and desire to secure by Letters Patent is:
it securely in predetermined position as the dies
1. Dies for bending sheet metal of a certain
are brought together to assure accurate location
minimum over-all thickness, and the like, com
of a bend, and at least one plug removablyr seated
prising, in combination, a female die having an
in one of the sockets having its exposed end con
elongated V-shaped groove in its face, a male die 10 toured similarly to the contour of the edge of
comprising a substantially solid relatively unyield
said ridge to, provide a substantially unbroken
ing body having a complementary elongated V
shaped ridge to cooperate with the groove, and a
plurality of localized prick-punches projecting a
relatively short distance from and beyond all
portions of the edge of said V-shaped ridge and
substantially less than the mentioned minimum -
thickness of the sheet metal to be bent to pierce
‘into a surface of the sheet metal without per
forating it to hold it securely in predetermined
position as the dies are brought together to as
sure accurate location of a bend, those portions
of the surface of said ridge intervening said pro
jecting prick-punches being substantially unin
Working surface.
7
5. A male die for cooperation with a female die
to bend sheet metal of a certain minimum over
all thickness, and the like, comprising an elon
gated ridge providing a Working face and hav
ing a plurality of sockets therein arranged along
the portion thereof which is farthest from the
base of said ridge, and a plurality of prick
punches removably seated in at least some of
the sockets projecting a relatively short distance
from the working surface of said ridge and sub
stantially less than the mentioned minimum
thickness of the sheet metal to be bent to pierce
terrupted and backed by solid male die body ma 25 into a surface of the sheet metal without per
terial.
forating it to hold it securely in predetermined »
22. Dies for bending sheet metal of ‘a certain
position during theformation of- a bend therein.
minimum over-all thickness, and the like, com
6. A male die for cooperation with a female
prising, in combination,a female die having an
die to bend sheet metal of a certain minimum
elongated groove in its face, a male die having
over-all thickness, and the like, comprising an
a complementary elongated ridge to cooperate
elongated V-shaped ridge providing a working
with the groove, said male die having a plurality
face and having a plurality of sockets therein
of sockets in the face of said ridge arranged along
arranged along the portion thereof which is far
the portion thereof which is farthest from the
thest from the base of said ridge, and a plu
base of said ridge, and a plurality of prick
rality of prick-punches removably seated in at
punches removably seated in at least some of the
least some of the sockets projecting a relatively
sockets projecting a relatively short distance from ' short distance from the V-shaped edge of said
the surface of said ridge and substantially less
ridge and substantially less than the mentioned
than the mentioned minimum thickness of the
minimum thickness of the sheet metal to be bent
sheet metal to be bent to pierce into a surface 40 to pierce into a surface of the sheet metal with:
of the sheet metal without perforating it to hold
out perforating it to hold it securely in predeter
it securely in predetermined position as the dies
mined position during the formation of a bend
are brought together to assure accurate location
of a bend.
3. Dies for bending sheet metal of a certain
minimum over-all thickness, and the like, com
prising, in combination, a female die having, an
elongated groove in its face, a male die having a
complementary elongated ridge to cooperate with
the groove, said male die having a plurality of
therein.
7. A male die for cooperation with a female
die to bend sheet metal of a certain minimum
over-all thickness, and the like, substantially
along a straight line comprising a relatively wide
die body having a mounting base portion, an
elongated ridge extending along said body oppo
site said base portion and providing a working
face, said ridge. having a plurality of sockets
sockets in the face of said ridge arranged along
the portion thereof which is farthest from the
therein extending toward said base portion and
base of said ridge, a plurality of prick-punches
said body having a plurality of knock-out holes
removably seated in at least some of the sockets
each extending therethrough from said base por
projecting a relatively short distance from the 55 tion to one of the sockets, and a plurality of
surface of said ridge and substantially less than
prick-punches removably ‘seated in at least some
the mentioned minimum thickness of the sheet
of the sockets projecting a relatively short dis
metal to be bent to pierce into a surface of the
tance from the working surface of said ridge
sheet metal without perforating it to hold it
securely in predetermined position as the dies 60 and substantially less than the mentioned mini
mum thickness of the sheet metal to be bent to
are brought together to assure accurate location
pierce into a surface of the sheet metal without
of a bend, and at least one plug remcvably seated
perforating it to hold it securely in predeter
in one of the sockets having its exposed end con
mined position during the formation of a bend
toured similarly to the contour of the face of
therein.
‘
said ridge to provide a substantially unbroken 65.
8.
A
male
die
for
cooperation
with
a female
Working surface.
die to bend sheet metal of a certain minimum
4. Dies for bending sheet metal of a certain
over-all thickness, and the like, substantially
minimum over-all thickness, and the like, com
along a straight line comprising a relatively wide
prising, in combination, a female die having an
die body having a mounting base portion, an
elongated V-shaped groove in its face, a male 70 elongated V-shaped ridge extending along said
die having a complementary elongated V-shaped
body opposite said base portion and providing a
ridge to cooperate with the groove, said male die
working face. said ridge having a plurality of
having a plurality of sockets in the edge of said
sockets therein extending from its edge toward
V-shaped ridge. a plurality of prick~punches re
said base portion and said body having a plu
movably seated in at least some of the sockets
rality of knock-out holes each extending there
2,405,778
7
8
through, from saidlbase portion to one ofv the
sockets, and a pluralityrof prick-punches remov
ably seated in at least some of the sockets pro
jecting a relatively short distance from'the edge
the formation of a bend therein,‘ andatleasti one
plug removably seated in each of the sockets hav
ing its exposed end contoured similarly to the
contour of the face of said ridge to provide a
of said V-shaped ridge and substantially less than
the mentioned minimum thickness of the sheet
substantially unbroken working surface.
10. Dies for bending sheet material of acer
metal to be bent to pierce into a surface of the
sheet metal without perforating it to hold it se
tain minimum over-all thickness, and the like,
comprising, in combination, a female die-having
curely in predetermined position during the for
an elongated groove in its face, a male die com
said’ base portion and providing a working face,
said. ridge having a plurality of sockets therein
extending toward said base portion and said body
tively short distance substantially less than the
10 prising a substantially solid relatively unyielding
mation of a ‘bend therein.
body having a complementary elongated ridge to
9. A male die for cooperation with a female
cooperate with the groove, and a plurality of
die to bend sheet metal of a certain minimum
localized prick-punches arranged along the pol‘
over-all thickness, and the like, substantially
tion of the ridge which is farthestv from the base
alongia straight line comprising a relatively wide
thereof and projecting from and beyond all por
die‘ body having a mounting base portion,'an elon
tionsof the surface of‘ said ridge toward the deep‘
gated- ridge vextending along said-body opposite
having a plurality of knock-out holes each ex
tending therethrough from said‘ base portion to
one of the sockets, a plurality of prick-punches
removably ‘seated in at least some of the sockets
projecting a relatively short distance from the
Working surface-of said ridge and substantially
less than‘ the mentioned minimum thickness of
est portion of the groove in said female die a rela- '
mentioned minimum thickness of the sheet ma—
terial to be bent; those portions of the surface of
said ridge intervening said projecting prick
punches being substantially uninterrupted and
backed by solid male die body material, said
prick-punches thus ‘being adapted to pierce'into
a surface of the sheet material without perforat
ing the latter to hold it securely in predetermined
they sheet metal to be bent to pierc'e'into a sur
position as the dies are brought together and thus
faceof the sheet metal without perforating it to
assure accurate location of a bend.
hold-it securely in predetermined position during
-
FRANCIS CRAWFORD, V
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