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Nav. 5, 1946.
Filed Nov. 8, 1944
IM .
Patented Nov. 5, 1946
Turner, Brielle, N. J.
Application November 8,1944, Serial No. 562,539
51Claims. v (Cl. 160--371)
(Granted under the act of March 3, 1883, as
amended April 30, 1928;370 0-. G. 757)
The invention described herein may be manu
factured and. used by or for the Government for
governmental purposes, without the payment to
me of any royalty thereon.
This invention relates to a method for rein
forcing an edge of any sheet-like materialby
means of reinforcing wedges-and a channel, the
method involving a-technique for forming and
ment by wedging the edge portion of the panel,
or of the structure, to .a channel ‘by means of
two wedges which are coated or impregnated
with a. suitable bonding material- The combina
tion is bonded together by subjecting it to..pres
sure, or- heat .and- pressure, in the usual manner,
thus permanently attachingthe. channel to the
sheet material.
It is, therefore,.the principal object of this
bonding of a panel or other sheet~like material
into one rigid structure with a materially‘rein 10 invention to provide .a novel method of reinforc
forced edge.
ing the edgesof any ‘material having a sheet- or
In numerous molding processes, such as mold
panel-like form.
ing of resin-bonded plywoods, large structures
Another object of the inventionis toprovide
having ?at, compound or spherical shapes are
a novel method of providing rigid frames for {ma
produced, theresulting structures ordinarily re~ .15 terialswhose pliabilities. are so high, that they
quiring their subsequent “?tting out,” involving
are incapable of supporting themselves inthe
interconnecting of the relatedmolded structures,
desired manner, thus necessitating the bonding
and connectingto-these structures of various
of these materials to the frames; the previously
auxiliary equipment. The panel-bonding proc
outlined: edge reinforcing technique in this case
ess involves bonding together of laminationssuch '20 is used for creating the desired frame.
as wood veneer, paper, fabric, etc. with heat-and
Still another objectof the invention is to pro
moisture-resisting synthetic ‘plastic glues, the
vide a method of. reinforcing the edges of any
bonding being accomplished by subjecting the
sheet- orpanel-like material, and for imparting
glue-coated laminations- to pressure,or heat and
to this material the curvature determined by the
‘pressure overthe bond-producing period of't-he >
curvatureof the channel used for reinforcing the
time. Because of increased strengthandirnodulus
periphery of the material.
of elasticity (Machine Design, July 1942, ‘pp.
An additional object of this invention isto pro
52-57), the impregnated plywood or 'paper' may
vide panels‘ or structures with; reinforced edges,
be subjected to relatively high‘stresses, and since
the reinforcement being obtained by connecting,
in the application of'any load the edges of the
with the aid of two wedges and glue, 2. Uushaped
impregnated material are frequently involved,
channel to the edges of the panel.
localization of strains can be avoided only‘ when
The novelifeatureswhich are believed to ‘be
the edges are properly‘ rein'forced‘for successfully
characteristic of the invention areset forth with
‘resisting and distributing the‘load' over the Wider
particularity in the: appended claims; the, inven
,1 35 tion- itself, however,v both as .to- its: organization
available areas.
The necessity for localized reinforcementof the
and; methodof, operation, together with further
edges has been fully realized in the past, and sev
objects arid: advantages thereof mayv best be un
eral ‘methods are now available and are invpro
derstood-byreference tov the following description
duction use for accomplishing‘ this result. One
taken in connection with the accompanying
of such methods consists of building up the edges .40 drawing, in‘ which:
to the desired thicknessnby‘ superimposing a num
Figure: 1 isa cross-sectional view of a plywood
ber of additional laminations‘immediately ad
panel with the reinforcing channel connected to
jacent' to and‘ on ‘both sides of the‘ normal edge,
1oneof its edges;
and by molding these added‘ laminations to the
“Figure 2 is a modi?cation of‘ Fig. 1;
‘border surfaces of thestructure. This'method, ‘
Figure 3 is a cross~sectional View of a jig con
besides‘ being laborious and expensive, does not
always produce the sought type of termination
and reinforcement and thus lacks mechanical
versatility and adaptability.
The present invention is an improvement‘ of
the existing edge reinforcing methods. ‘It con
sists of providing an edge reinforcing channel
which is molded to the edge portion of a panel
or any other structure needing edge reinforce
nected to a source of electric power-and a chan~
nel in a state‘ of its assembly; and
Figures 4, 5, 6 and 7 illustrate various applica
50 tions of the method disclosed in the Figs. 1 to 3.
‘.Referring to ‘Fig. 1, .a channel it, made of im~
pregnated, jolywoodp?ber. or other easily impreg¢
nated material. or metaLcapable .of establishing
.a permanent. bond?with, the glues, usedasean
outerborder, element. ‘for .a panel. .I 2 made. otany
material capable of establishing mechanical bond
with the glues. Bonding of panel‘ [2 to channel
I0 is established by means of two wedges I4 and
16, which fill in the space between the panel and
the channel. The wedges and the edge portion
of the panel are dipped into, impregnated with,
or painted over with the, bonding compound 20
prior to their assembly, and then inserted into
the channel, as illustrated more fully in Fig. 3,.
pressure being applied to wedge 320 by a ram 10
or clamp 32%. As illustrated in Fig. -1, ‘any de
sired angle may be imparted to the connection
between the reinforcing channel and the panel
by varying the shapes of wedges M and [6. A
slanting relationship between the panel and the
channel is illustrated in the Figs. 1, 3 and 7, while - "
for keeping wedge 320 in place, it may be pro
vided with a suitable heat-insulating liner so
that it does not absorb or conduct the heat away
from wedge 328, and the upper portion of wedge
322 and channel 300 may also be covered with
some suitable material which would prevent
wasteful radiation and flow of heat away from
the upper portion of wedge 322 and channel 303.
The advantages of the illustrated method re
side in the fact that the jigs represent very
simple and inexpensive structures which may be
made very readily from such materials as wood.
Therefore, wider use of such reinforcement
method ismade possible, since any small shop
possessing no special dyes or expensive presses
could build the inexpensive jigs of the type illus
trated in Fig. 3. Moreover, the jigs of this type
vcan be built for conforming with any desired
’ curvature making it possible for the shops to
‘7; they may be varied by varying the shapes of 20 handle work of versatile nature, even when it
involves making of only one desired model.
the wedges.
When metal is used for reinforcing the panels,
Figure 2 illustrates a reinforcing channel 200,
high frequency method of heating the assembly
a panel 202, and wedges 204, 206 which are similar
may produce localized heating, and as a result
to the elements illustrated in Fig. l, the dif
ferences being in the shape of the wedges, and the 25 may be replaced with the electrical heaters using
resistance elements, or replaced with hot air
materials used for obtaining the sought result.
heating bags, oven heating, etc. which would give
Channel 200 is a metal channel, wedges 284, 208
even temperature distribution.
can be made of plastic, wood, ?bre, metal or
Several applications of the disclosed method
cellulose; panel 202 can be made of the same
materials as the wedges, and the glue used for 30 are illustrated in Figs. 4 to 7 and will be described
presently. Figs. 4 and 5 illustrate the application
bonding the elements can be either a synthetic
of the method to a parabolic re?ector for an
or animal glue. When the panel, channel, and
ultra-high frequency antenna. The re?ecting
the wedges are made of weldable metals, the use
surface is provided by the chicken-fence wire 400
of glues may be dispensed with and the elements
joined by welding them together. The channel 35 which is given the form of a parabolic reflector
by means of frames 402, 404, etc. illustrated in
may be equipped with bolts, one of which is
Fig. 5. The frames are shaped as parabolic sur
illustrated in the ?gure.
face sectors which are interconnected to form a
‘The method of assembling and bonding the
unitary mechanical structure possessing the re
structures of the Figs. 1,. 2, 4, 6 and '7 is repre
Figs. 2 and 6 illustrate the connection in which
the sides of the channel are parallel to the sur
face of the panel. Note angles 0 and 01 in Fig.
Depending 40 quired parabolic form.
Figure 4 illustrates, partly in cross-section and
partly in perspective view, a portion of channel
panel, and the type of bonding desired, the
sented diagrammatically in Fig. 3.
upon the materials used for the channels, wedges,
' enumerated
404 and chicken-fence wire 400. As in the case of
the Figs. 1 and 2, the wire is permanently con
painted, or impregnated with the bonding ma
terial to be used. When impregnation is the 45 nected to frame ‘404 by means of wedges 401 and
402. These wedges may be made of ?brous ma
selected method, the elements must be im
terial so that the wire mesh sinks into the wedges.
pregnated according to the known methods prior
Good results are also obtainable with the wooden
to their assembling. Upon completion of im
wedges impregnated with the synthetic glue.
pregnating, channel 380 is put into a recess pro
vided between side members 302, 306 which are 50 The sectors are held together by U bolts 1H4 pro
vided with plates 1H6 and 1H8 which distribute
permanently fastened to a base plate 306. The
recess is provided with metal plates 308, 3 l 0 which
the bolt load over a wider area of the frame. The
advantages of the parabolic re?ector illustrated in
the Figs. 4 and 5 are lightness and simplicity of
Channel 300 should preferably ?t tightly into the 55 the resulting structure, and low cost and ease
of manufacturing.
jig’s recess so that subsequent pressure exerted
Figures 6 and '7 illustrate application of the
on its side-walls by wedges 320 and 322 should
method to the panels which may have compound
not materially strain or break the channel. The
curvatures, such as panel 608 illustrated in Fig. 6.
next step consists of inserting wedge 322, panel
When this is the case, channel 302 follows the
324, and pressing down wedge 320 with a ram
path of the compound curve, and the panel is
326. When wedge 320 is driven into the channel,
connected to the rigidly held channel 602 by
the excess bonding material, if any, is preferably
bending it until it ?ts into the channel; the chan
wiped off, switch M8 is closed,‘ and the entire
nel, in this instance, acting not only as the edge
assembly heated or allowed su?icient time to set
reinforcing means, but also as a jig which holds
in the case of the cold-setting glues, thus estab
panel 560 in the vdesired manner and imparts to
lishing the necessary bonding between the ele
the panel. or at least to the edge of the panel
ments. In many instances, involving the use of
connected to channel 592, the sought curvature.
synthetic glues and subsequent heating, proper
Fig. ‘7 illustrates the method of changing the
binding between the elements may be established
only when the elements are under pressure. In 70 angle or position of panel ‘N10 with respect to
channel 702. Wedges ‘I04 and 166 are given such
Fig. 3 this pressure is originally established by
shape that panel 100 forms an
ram 326, and is subsequently maintained either
by friction or suitable clamps, which keep wedge
are connected to a high frequency source 312
over conductors 3M, Sit and a switch 3m.
320 in its proper place during the baking ch75
setting period of the assembly. If ram 326 is used
which is less than 90° at the nearest end of the
channel. At the upper end of the channel, the
same angle has been changed to
Dept. of Agriculture Pamphlet No. R1277, titled
“Urea-Plasticized Wood,” “Paper base plastics
laminates,” by W. B. Darling, Riegel Paper Corp.,
New York city.
It is believed that the construction and method
of manufacturing the bonded reinforcing frame,
as well as the many advantages thereof, will be
which is greater than 90°. This shift is obtained
apparent from the foregoing description. It
by shaping the wedges "E96 and 1M so as to make
wedge 165 as the entering wedge in the frontal
should be understood that while I have shown and
portion of the assembly, and wedge ‘106 as the en 10 described my invention in several preferred forms,
reasonable changes and modi?cations may be
tering wedge at the remote portion of the channel.
made without departing from the spirit of the
The word “wedge” as used in the speci?cation
invention, as sought to be de?ned in the follow
and claims is intended to include all means to
hold a panel securely within a channel; thus in
ing claims.
Fig. 1, wedge l6 diverges inwardly, while wedge 15 I claim:
1. The combination of a panel and a reinforc
l4 converges inwardly, and both wedges have the
ing structure for an edge portion of said panel,
outer sides parallel to the inner sides of the U
said structure comprising a U-shaped channel,
member [0. In Fig. 2 the wedges assume the form
?tting over the edge portion of said panel, two
of the two members 204 and 206 having rectangu
wedges ?tting in said channel and holding said
lar cross-sections or only slight convergence for
panel in ?xed relationship with respect to said
facilitating their insertion into channel 200,
which slight convergence may be applied to only
one wedge, which is preferably inserted last, and
the other wedge being rectangular in cross-sec
From the description of the plastically-bonded
reinforcing channel, it should be apparent to
channel, said panel ?tting between said wedges,
and a bonding means interconnecting said chan
nel, wedges, and said panel.
2. The combination of a panel and a reinforc
nections, such as those illustrated in the Figs. 2,
ing structure for an edge portion of said panel,
said structure comprising a U-shaped channel
mounted over the edge portion of said channel, a
wedge ?tting in said channel on each side of
said panel, and a baked synthetic glue bonding
4 and 5, become quite feasible, thus increasing
the application of the bonded. channels to many
said channel, wedge-s and'the edge portion of the
panel ?tting between said wedges in said channel.
uses which will readily occur to the skilled in
3. The combination of a panel and a reinforc~
those skilled in the art that it possesses many
practical advantages; convenient bolt-type con
ing structure for an edge portion of said panel,
of the large number of possible applications. 35 said structure comprising a U-shaped channel
mounted over the edge portion of said panel, and
Thus Fig. 4 illustrates the application of the
a ?ller impregnated with a synthetic glue, ?tting
method to the construction of an antenna re
in said channel on each side of said edge portion
?ector, while Figs. 6 and '7 are very suitable for
of said panel, for bonding said channel and the
constructing boats, furniture, etc. One of the
important advantages of the method resides in 40 edge portion of said panel together.
4. The combination of a panel and a reinforc
the fact that the sought results may be obtained
ing structure for an edge portion of said panel
without resorting to the use of such expensive
normally lying in a single plane, said structure
equipment as cast-steel, dyes, and large hydraulic
comprising a curved, rigid, U-shaped channel,
presses. Another important advantage lies in the
fact that lightweight, stiff structures can be ob 45 two wedges ?tting in said channel for holding
said edge portion in ?xed relationship with re
tained without the use of any metal in the con
spect to said channel, and for bending at least
struction, thus reducing cost and the manufac
the edge portion of said panel until said edge por
turing difficulties. The pressure necessary for
forcing wedge 320 down is relatively insigni?cant
tion follows the curvature of said channel, and
because of the small involved areas; the same is 50 a bonding glue interconnecting said channel,
true of the jigs, and, therefore, the entire equip
wedges and said panel.
5. The combination of a pliable sheet and a re
ment, can be constructed of light parts made
inforcing frame for supporting said sheet, said
locally in small carpenter shops.
frame including a U-shaped channel comprising
The following references are mode a part of
this disclosure to aid the understanding of this
the outer member of said frame, two wedges ?t
the art, and which cannot be enumerated because
invention: “High frequency heating,” by D. W.
Brown, “Plastics,” May 1944, pp. 218-226; “Radio
frequency heating applied to wood gluing,” by R.
ing in said channel and holding said sheet in ?xed
relationship with respect to said channel, and a
bonding means interconnecting said channel,
A. Burwith, et al., I. R. E. P. vol. 31, 1943, p. 529;
wedges, and said sheet.
“Heating wood with R. F. power,” by J. P. Taylor,
et al., A. S. M. E. T., April 1943, pp. 201-212; U. S.
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