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Патент USA US3029518

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April 17, 1962
Filed April 29, 1958
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United States Pate
Patented Apr. 1'7, 1962
Howard Kent, Rte. 94, Newton, NJ.
Filed Apr. 29, 1958, Ser. No. 731,678
1 Claim. (Cl. 29-534)
corrugated condition following the first step of my im
proved method of fabrication which consists in stamping
or otherwise forming transverse corrugations 11 continu
ously along all portions of the blank except the longi
tudinal marginal or side edge areas 12-12 that are to be
united by braze or solder in a lap joint type of seam.
FIG. 2 shows the partially formed wave guide after
The invention relates in general to longitudinally
being bent transversely inward into tubular form in the
seamed ?exible wave guides of rectangular cross-section
second step and having the overlapping portions 12—12
having transversely corrugated side walls which are used 10 permanently united in a seam 13 in the third step.
to make a ?exible connection between rigid wave guides
or other elements of a high frequency (very high fre
FIG. 3 shows the ?nal or fourth step, which consists in
formation of corrugations in seam portions l2—l.2 by ap
quency through extremelyhigh frequency) electric cur
plication of inside and outside dies 14 and 15, respec
rent transmission line, and has particular reference to
tively, in a manner well known to mechanics skilled in
the method of making such a ?exible guide.
15 the art.
The type of wave guide to which the invention relates
Practice of the improved method of fabrication will pro
is disclosed in United States Patent No. 2,600,169 issued
duce such smooth continuity of the transverse corruga
to John M. Lamb on June 10, 1952. In fact, the present
tions in the seam area that undesired electrical degrada~
invention is a speci?c improvement in the method em
tion will be eliminated.
ployed to corrugate the lap joint seam areas of the walls 20 It will be understood that it is intended to cover all
of the wave guide disclosed in said patent, which, for
changes and modi?cations of the example of the inven_
clarity of reference, will be referred to hereinafter as
tion herein chosen for the purpose of illustration which
“the said patented wave guide.”
do not constitute departures from the spirit of the inven—
Prior to my present invention, it has been practice in
tion and scope of the appended claims.
fabrication of the said patented wave guide to corrugate 25 I claim:
the wide ?at strip, or blank, throughout its complete area
The method of fabricating a ?exible corrugated wave
except at one or both end portions thereof before bend
guide of substantially rectangular cross-sectional tubular
ing it into tubular form and uniting the meeting longi
form having corrugations whose ridges and valleys ex
tudinal edges by a lap joint brazedor soldered seam. In
tend at right angles to the longitudinal axis of said wave
consequence of this mode of fabrication, particularly 30 guide which consists in a ?rst step of corrugating an elon
when the seam extends along the center line of a broad
gated rectangular ?at strip of electrically conducting
side wall, the guide is degraded electrically because of re
metal to form corrugations whose ridges and valleys ex
?ections set up by the small variations in the stretch of
tend at right angles to the longitudinal side edges of said
the seam. This generally is caused by bridging of the
strip and terminate Short of said edges to leave ?at seam
convolutions by braze or solder of the seam, or by varia 35 portions extending longitudinally in marginal relation
tions in the anneal of the seam. Although in the smaller
thereto; a second step in which the partially corrugated
size guides the corrugations and seams are quite small and
strip is transversely in-bent into tubular form with the
the cavities between adjacent protuberances are of capil
?at seam portions located substantially in one side wall
lary dimensions, the bridging and electrical degradation
of the wave guide and with the corrugations initially
40 formed arranged with their ridges and valleys at right
will be proportionately increased.
angles to the longitudinal axis of the wave guide; a third
It, therefore, is the primary object of my present inven
step in which the ?at longitudinal seam portions of the
viding an improved method of fabrication.
strip are overlapped and electrically and mechanically
Other objects, advantages and features will become ap
closed by formation of a permanent seam; anda fourth
parent as the following speci?c description is read in con 45 step in which the seam is corrugated transversely with
nection with the accompanying drawing, in which:
corrugations whose ridges and valleys are arranged at
‘FIG. 1 is a. fragmentary plan view of the ?at metallic
right angles to the longitudinal axis of the wave guide
strip, or blank, after being initially corrugated except in
and in matching relation to the initially corrugated areas
the marginal seam areas;
of the strip by die registration contact with the latter.
tion to remove the causes of electrical degradation by pro
FIG. 2 is a transverse section of the wave guide follow 60
ing in-bending of the side portions and completion of the
seam but before corrugation of the latter; and
FIG. 3 is a longitudinal section, showing operation of
mated dies in corrugating the seam.
Referring now in detail to the accompanying drawing,
wherein like reference characters designate corresponding
parts in the several views, the ?at strip, or blank 10 of
conducting metal is represented in FIG. 1 in'its partially
References Cited in the ?le of this patent
Fox ______________ __\__ June 28,
Kemp ______________ _._ July 19,
Thompson __________ .. Apr. 15,
Taylor ______________ __ Mar. 30,
Fulton ____________ __ Nov. 15,
Lamb ______________ __ June 10,
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