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Патент USA US2105734

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Jan. 18, 1938.
Filed Nov. 11, 1935
2 Sheets-Sheet l
J2 J3
Jan. 18, 1938.
Filed Nov. 11, 1935
2 Sheets-Sheet 2
Patented Jan. 18, 1938
Clarence S. Henderson, Batavia, 111., assignor to
Acme Steel Company, Chicago, £11., a corpo
ration of Illinois
Application November 11, 1935, Serial No. 49,246
1 Claim.
This invention relates to improvements in coils
of steel strapping and the like and to methods
of forming the same according to which these
coils are formed in an improved manner so that
they retain their original shapes and conditions
during the process of shipment and. until they
have been entirely consumed by the user. It has
heretofore been the usual practice to wind flex
ible steel strapping in the form of coils in such
a manner that there are several spiral layers of
strapping side by side. After being wound, the
ends of these coils have been secured and they
have been removed from the winding drums and
shipped in that condition to the user who, during
the process of use, has placed the coil on a ro
tatable drum and unwound the metal from the
outer side thereof. ‘These coils have ordinarily
been of rectangular cross-section with the edges
of the metal strips at opposite sides of the coil
lying in parallel planes and with the inner and
outer layers of the coil lying in concentric circles.
However, it has been found that during the proc
ess of loading and shipment, these coils often
receive severe shocks and jolts which sometimes
cause all of the layers or convolutions oi the
metal at one side of the coil to be deflected or
bowed inwardly, in conjunction, usually, with a
lateral spreading of the metal in this part of the
coil. This bulging and spread of the metal has
interfered with the unwinding of the coil in use
and it has usually been found impossible to re
store the distorted part of the coil to its original
shape after it has once been de?ected therefrom,
with the result that many coils have to be
scrapped or returned to the factory for rewinding.
The present invention involves the discovery
that a metal coil of this character may be retained
in its original shape under all ordinary condi
tions by winding the strip of metal initially upon
a light ?exible core or drum, formed preferably
of thin wood veneer, which is allowed to remain
in the coil during its packing and shipment and
during the subsequent use of the metal strapping
by the consumer. When wound in this manner,
the coil retains its original circular shape under
all ordinary conditions and even when subjected
to the shocks and blows which have heretofore
been sufficient to effect the distortion complained
of, and if, when an unusually severe blow imparted
to the coil of the present invention results in its
distortion, it is found that with the ?exible core
or drum on the inside of the coil, an outward
pressure will restore this portion of the coil to
its original arcuate shape. The principal object
55 of the invention, therefore, is to provide an im
(Cl. 206-59)
proved coil comprising a light ?exible core or
drum having wound thereon a plurality of con
centric convolutions of metal strapping or the
like. Another object is to provide a core for
metal coils comprising a plurality of‘layers of (ii
thin ?exible veneer secured together. Still an
other object is to provide an improved method of
forming a coil comprising the steps of forming
a thin ?exible core or drum made up of a plu
rality of laminations of thin veneer, then attach 10
ing one end of the metal strapping to the drum
and winding the strapping thereon to form a
plurality of concentric and parallel layers which
make up a body of metal of substantially rec
tangular cross-section, and ?nally securing the
core and the layers of metal together to prevent
their lateral or relative displacement during ship
ment. Other objects relate to various features
of construction and arrangement and to details
of the improved method which will appear more ~_
fully hereinafter.
The nature of the invention will be understood
from the following speci?cation taken with the
accompanying drawings, in which one embodi
ment of the improved coil construction and one
example of the improved method are illustrated.
In the drawings,
Fig. 1 shows a top plan view of the improved
coil of the present invention;
Fig. 2 shows a side elevation of the coil illus
trated in Fig. 1;
Fig. 3 is a perspective view of the improved
?exible core or drum upon which the metal is
Fig. 4 is a perspective view of the layers or 3
laminations of veneer which are employed in the
construction of the core shown in Fig. 3;
Fig. 5 shows an enlarged section taken through
a portion of the coil transversely to the axis there
of, showing the means for attaching the metal to
the core and the means for preventing relative
separation of the core and the convolutions of
metal; and
Fig. 6 is a transverse section taken on the line
6-6 of Fig. 5.
As illustrated in the drawings, the improved
coil of the present invention comprises a circular
core or drum l0 formed preferably of two or
more layers of wood veneer or the like, and hav
ing wound thereon a single length of steel strap- ping H which is relatively narrow as compared
with the width of the core It and which is wound
with a number of concentric and laterally parallel
convolutions so that the resulting body of metal
is of substantially rectangular cross-section and.
is made up of a number of circular layers Ha
each formed as a spiral coil. When the wind
ing of the coil has been completed, the core and
the metal are secured against relative displace
ment at a plurality of points by winding strips
of cardboard 12 or the like laterally around the
built-up coil and then winding around each of
these protective sheets I2 a ?exible binder I3
which, in this instance, is shown as being in the
10 form of a round wire having its ends twisted to
gether as shown at Eta after the wire has been
drawn taut around the coil.
The core It is preferably made up of a number
of layers iOa, Nib and IBC of comparatively thin
15 material, such as wood veneer, which has consid
erable flexibility but which is adapted to retain
the circular shape of the completed core when the
layers of laminations have been secured together.
The two long layers Mia and ltb are wound one
upon the other, as shown in Fig. 3, with the
diagonally cut ends of each strip in proximity to
each other but with the joint at the end of one
I strip arranged in staggered relation to the joint
at the end of the other strip. The joint in the
outer strip is protected and reenforced by the
insertion between the layers Mia and iii", at this
point, of the short layer ID”. All of the layers
are secured together adjacent the joints by diag
onal rows of staples M which are arranged on
opposite sides of each joint.
Other staples 15
may be passed through the layers of the core
at other places around its circumference and, if
desired, the layers may be glued or otherwise
secured together. At one point around the cir
cumference of the core or drum, preferably op~
have been completed to form a. body of metal of
the desired radial thickness and of substantially
the same width as the core it.
One of the pro
tective sheets 12 of ?breboard or the like is then
placed around the completed coil adjacent the
outer end of the metal strip and this outer end is
then reversely bent as shown at Me in Fig. 5.
One of the wires I3 is then drawn taut around the
protective sheet I2 and its ends are twisted to
gether, after which the outer extremity of the
metal strip H is bent in the opposite direction
over the wire i3, as shown at lid. When this
has been done, other protective sheets :2 and
binding wires it are applied to the coil at other
points around its periphery. It is usually desir
able to employ at least three or four of the pro
tective sheets i2 and a corresponding number of
binders 53. The coil is then completed, ready for
shipment, and it has been discovered that if dur
ing loading or transit the coil be dropped, for
example, so that a heavy blow is imparted to one
side thereof with the result that a portion of the
coil is bowed inwardly as shown by dotted lines
at l5 in Fig. 2, this inward bulge may be elimi
nated by an outward pressure on the inner side
thereof with the result that both the ?exible
core ill and the surrounding body of metal are
restored to their original shapes. If a similar
bulge or distortion had occurred in a body of
metal wound in a coil formed according to the
old practice, the distortion would have been
permanent and could not have been eliminated.
It will be understood that the invention may
be constructed in various embodiments, not here
in illustrated, without departing from the scope ' "
posite the intermediate layer 10°, the two layers
its and I011 are provided with a central aperture
of the appended claim.
I claim:
Hid of rectangular form which is of substantially
the same width as the metal strip l l to be wound
a plurality of thin laminations secured together
40 on the core.
In the process of forming the coil, after the
core H? has been completed in the form shown in
Fig. 3, one end lib of the metal strapping H is
inserted through the aperture ltd from the outer
side of the core and is reversely bent as shown
in Fig. 5. With the core Ii) placed upon the
usual rotatable winding drum, the winding of the
long strip of metal then continues until all of the
concentric and laterally parallel layers of metal
A coil comprising a wooden core made up of
and each extending substantially throughout the 40
circumference of the core, each of said lamina
tions having its ends offset with respect to the
ends of an adjacent lamination, a short lamina
tion interposed between said laminations and
overlapping’ the ends of one of said laminations,
and a length of metal strapping wound in super
imposed layers on said core.
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