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Патент USA US3042109

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July 3, '1962
w, H, NEELY
3,042,099
METHOD OF BENDING TUBULAR MEMBERS
Filed April 23, 1959
l
I
.
INVENTOR.
WILLIHM H- NEELY
Unite States Patent 0 ”
1
3,042,099
METHOD OF BENDING TUBULAR MEMBERS
William H. Neely, Cleveland, Ohio, assignor, by mesne
assignments, to Hoover Ball & Bearing Co., Saline,
Mlch., a corporation of Michigan
Filed Apr. 23, 1959, Ser. No. 808,345
5 Claims. (Cl. 153-2)
This invention relates in general to bending of elongat
3,042,099
Patented July 3, 1962
2
any desired shape and have many other advantages fully
appreciated by those skilled in the art.
The accompanying drawing more or less diagrammat
ically illustrates the successive steps taken in bending a
tubular member in accordance with the method of the
invention.
In the drawing:
FIG. 1 is a diagrammatic cross-sectional view of an in
denting die arrangement seating a tubular member of rec
ed tubular members and has particular reference to an 10 tangular cross section prior to indentation of opposed
improved, simpli?ed method of bending a tubular member
without bulging.
wall portions thereof.
FIG. 2 is a view similar to FIG. 1, showing the tubular
At present, bending of tubular members is effected by
member indented.
?lling these members with sand, gravel, resin, or chain
FIG. 3 is a diagrammatic side view of a bending die
like structures of interconnected balls, mandrels, etc. 15 arrangement supporting the indented tubular member.
However, this presently used procedure in bending opera
FIG. 4 is a cross-sectional view at about the center of
tions prevents only collapsing of the tubular members, but ‘ FIG. 3.
permits their deforming, and generally necessitates re-shap
ing of thus bent portions of tubular members.
FIG. 5 is a side view similar to FIG. 3, showing after
bending operations have been terminated.
The primary object of this invention is to provide an 20 FIG. 6 is a side view of the bent tubular member; and
improved and simpli?ed method of bending a tubular
FIG. 7 is a cross-sectional view at the center of FIG. 6.
member, the method including two successive steps, one
Referring now more particularly to the exempli?ed
step effecting indentation of two opposed wall portions of
form of structure shown in the drawing and bent in ac
the tubular member and the other step effecting bending
cordance with the method disclosed herein, reference nu
of two other opposed wall portions of the tubular mem 25 meral 2 denotes a tubular member of rectangular cross
ber, which latter wall portions are angularly related to the
section, which includes oppositely arranged top and bottom
?rst wall portions to promote by bending operations fold
walls 3 and 4 and oppositely arranged side walls 5 and 6.
ing of the indented wall portions upon each other and
Tubular member 2 is bent in successive method steps, step
avoid bulging of all wall portions of the tubular member.
one effecting longitudinal indenting or crimping of side
Another object of the invention is to provide a method
walls 5 and 6 and step two effecting bending of top and
of bending a tubular member, the method including two
bottom walls 3 and 4 about a transverse axis through the
successive steps, one step effecting symmetrical longi
side walls and their forcible approach toward each other.
tudinal indenting of two opposed wall portions of the
indenting of side walls 5 and 6 is accomplished in a die
tubular member in a plane through the longitudinal axis
arrangement 7 which includes supports 8 seating the tu
thereof and the other step effecting bending of two other ' bular member 2, and identically constructed oppositely
opposed wall portions of the tubular member, which latter
arranged shiftable die members 9 and 10 slidably mounted
wall portions are related at a right angle to the ?rst two
on base 11 in axial alignment with respect to each other
opposed wall portions to promote by bending operations
and at a right angle with respect to tubular member 2.
cooperative symmetrical folding of the indented wall por
The die members 9 and 110 include die heads .12 and 13,
tions upon each other and avoid bulging of all wall por 40 respectively, which have their opposed end portions slotted
tions of the tubular member.
by cross slots 14 and 15, dimensioned to ?t tubular mem
This method is well suited for bending tubular members
ber 2 and hold same against rotation in indenting opera
of rectangular cross section into furniture and automobile
tions. Die heads 12 and 13 have symmetrically arranged
seat frames. The use of rectangularly shaped tubular
in their cross slots 14 and .15 elongated ridges 16 and 17
members substantially facilitates attachment of springs, 45 which cooperate in indenting walls 5 and 6 when die mem
spring structures and other elements, and provides suf
bers 9 and 10 are shifted toward tubular member 2 and
?cient tensile and torsional resistance for all load require
form elongated indentations 18 and 19 in said walls 5 and
ments.
6, which indentations extend parallel to each other and
A further object of the invention therefore is to provide
symmetrical to said side walls.
a method of bending a tubular member of rectangular 50
The thus indented tubular member 2 in the second step
cross section, the method including two successive steps:
of the bending method of the invention is bent in a bend
(1) ?rst effecting localized symmetrical longitudinal in
ing die arrangement 20 embodying two longitudinally
denting of two opposed walls of the tubular member, and y spaced tiltable lever members 21, 22 which are tiltably
(2) next effecting localized bending of the other two op—
supported on pivot pins 23, 24 in perforated ear portions
posed walls of the tubular member, and localized approach 55 25, 26 of a base not shown. Bending die arrangement 20‘
includes a shiftable punch-like die member 27 arranged
of the last two opposed walls toward each other both to
in upwardly spaced relation with respect to lever members
cause localized bending of the said last two opposed walls
at curvatures of relatively small radii and to cause local
21, 22 of identical construction which each include a ?at
ized folding of the said ?rst two opposed walls upon each, 60 supporting top 28, 29 and side ?anges 30, .31, respectively,
arranged to locate and guide tubular member 2 on ?at sup
other, thereby to produce reenforced bends by a plurality
porting tops 28, 29' of tiltable lever members 21, 22. The
of packed layers of material.
previously indented tubular member 2 seated on support
A still further object of the invention is to provide a
ing tops 28 and 29 of bending die arrangement 20 is bent
method of bending a tubular member of rectangular cross
by downward shifting of punch-like die member 27 which
section in the manner described above, in which the in 65 engages with its reduced head portion 32 top wall 3 of
dented area of the two opposed wall portions is small to
the tubular member and forces said top wall toward bot
effect bending of the tubular member in a limited area and
tom wall 4, thus collapsing the tube in the bending zone.
permit quick merging of the folded opposed wall portions
The pivotal tilting of the lever members 21, 22 serves to
into straight wall portions extended at right angles thereto.
“semi-floatingly” resist bending of the tubular member
As a result, tubular members bent in accordance with 70 during its ?nal forming.
the method disclosed herein, shaped without bulging and
The described bending operations assure smooth curv~
undesired tensile or torsional stresses, are readily bent to
ing of bottom wall 4, produce a U-shaped bend in top
3,042,099
3
Wall 3 and fold side Walls 5 and 6 upon each other to pro
vide tubular member ‘2 with a reenforced sharp bend 33,
the apex 34 of which embodies superposed layers of wall
portions. Indenting of side walls 5 and 6 reduces the
height of the tubular member and eliminates possible
bulging of wall portions (beyond the con?nes of the tubular
member 2 before its deforming and bending.
Although pivot pins 23, 24 are shown parallel, and
lever members 211, 22 are shown coplanar, I contemplate
any desired angular orientation of one pivot pin and lever
member relative to the other so as to bend one arm of the
tubular member into any desired plane and angular ori
4
crimping opposite sides of said member in the bending
Zone, and thereafter folding the crimped sides on them
selves, and bending said vmember in said zone about a
transverse axis through said opposite sides.
3. The method de?ned in claim 2 wherein said folding
and said bending are concurrent.
4. In a method of bending a rectangular tube, the im
provement which comprises inwardly longitudinally
crimping opposite sides of said tube in the bending zone,
and thereafter collapsing said tube in said zone \with the
crimped sides folded on themselves, and bending said
tube in said zone about an axis substantially parallel to
said crimped sides.
5. The method de?ned in claim 4 wherein said collaps
Though but a single example of carrying out the meth
od of bending tubular members has been disclosed herein, 15 ing and said bending are effected by exerting pressure
on one of the remaining tube sides in the bending zone,
it is obvious that many and varied types and forms of
while yieldingly supporting tube portions on opposite sides
bent tubular elements may be produced by the bending
of the bending zone.
method of the invention, all within the spirit and scope
of the appended claims.
References Cited in the ?le of this patent
20
Having thus described my invention what I claim is:
UNITED STATES PATENTS
1. In a method of bending a tubular member, the im
entation relative to the other.
provement which comprises inwardly longitudinally
crimping opposite sides of said member in the bending
352,656
1,070,379
Parker _______________ __ Nov. 16, 1886
Summey _____________ __ Aug. 12, 1913
zone, and thereafter bending said member in said zone
25
about a transverse axis through said opposite sides.
2. In a method of bending a tubular member, the im
1,217,101
1,994,725
2,285,275
Merritt ______________ __ Feb. 20, 1917
Offutt ________________ __ Mar. ‘19, 1935
Harder _______________ __ June 2, 1942
provement which comprises inwardly longitudinally
2,748,455
Draper _____________ __ June 5, 1956
out
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