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Патент USA US3035838

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May 22, 1962
M. STUBNITZ
3,035,828
SPRING ELEMENT FOR SEATING STRUCTURE
Filed Aug. 4, 1958
INVENTOR
MAUFRl CE. STUBNITZ
BY
$3M
ATTORNEY
United States Patent O?ice
3,635,828
Patented May 22, 1962
1
2
3,035,828
wooden frame 12, a suitable pad 14 carried by an insula
tor 16 and a cover 18. The resilient support for the pad
14 and insulator vl6 takes the form of a plurality of
SPRING ELEMENT FOR SEATING STRUCTURE
Maurice Stuhnitz, Adrian, Mich., assignor to Stubnitz
Greene Corporation, Adrian, Mich, a corporation of
spring wire elements 20 arranged in parallelism and
bridging the spaced opposed sides of the frame 12.
Filed Aug. 4, 1958, Ser. No. 752,828
5 Claims. (Cl. 267-110)
portion 22, preferably of substantially straight form in
Michigan
in
As illustrated, the elements 20 have a preformed arch
contrast to so-called zig-zag or sinuous wire elements now
The invention relates to improvements in resilient seat
and back construction, being particularly adapted for use
in furniture such as chairs, sofas, hassoeks, etc.
More speci?cally, the invention resides in an improved
spring wire structure comprising a plurality of arched
wire members having Z-shaped torsion bars at their ends
and disposed in spaced parallelism with their opposed
ends disposed in hinged relation with spaced opposed
suppont portions.
being extensively used in furniture.
At opposite ends
of the arched portion 22 of each spring element 29 are
integral torsion bar portions 24 which rest upon the
surface of the frame 12. Lateral extensions 26 upon the
torsion bars 24 are received in suitable socket means
such as holes 28 de?ned in the ‘frame 12 and provide a
15 non-rotational
connection with respect to torsional
stresses exerted upon the torsion bar portions 24 as well
as a hinge point for one end of the torsional bar por
tions 24.
The invention has particular advantage in the manu
facture of furniture using wooden frames for the reason
It will be readily appreciated that when the spring ele
that no stress is placed upon the wooden frames except 20 ment 20 is loaded that there will be a tendency for the
during the period when the spring wire structure is sup
cordal length of the arch to increase with the torsional bar
porting a load. This arrangement relieves the tendency
extension 26 hinging in the holes 28. Also, when the
of wood frames to warp or pull in and obviates the neces
elements 2% are loaded torsional stresses will be developed
sity of using numerous cross struts to keep the wooden
within the torsion bars 24 such stresses being resisted by
frames in proper shape.
25 the anchorage of the extension 26 within the holes 28 of
It will also become apparent from the illustrated em
the frame. Under no load, because the elements 20 are
bodiment of the invention that the simplicity and ease
preferably pre-formed, no stresses are bearing upon the
of application of the spring elements makes them readily
frame 12 tending to warp or pull in the sides of the frame
adaptable to all kinds of seating structure from vthe
simplest stool or hassock to the more intricate and expen
sive chairs and sofas.
12. Under load, the Z-shape of the wire spring elements,
as viewed in plan view, adds greatly to the stability of
the elements by resisting any tendency to roll or be dis
Thus, an object of the invention is to provide a novel
placed sidewise. The hinge action of the elements 20
spring wire element for seating structure in the form of
about the longitudinal axis of the extensions 26 permits
an arch having transverse torsion bar portions at opposite
the use of a “linear” spring for the arched portion 22
ends to provide end supports for the arch, the bar por 35 of the spring element as the effective length of the spring
tions having angular hinge and anchor extensions re
is able to vary to support the load conditions. [it will be
ceived Within the support structure.
understood that when the cordal length of the arch 22
Another object is to provide an improved spring wire
is increased or decreased that the torsion bars 24 will
element for seating structure in the form of a Z-shaped
hinge about the extensions 26 and preferably the torsion
40 bars 24 are resting upon the surface of the frame 12 and
arched tension member.
A further object is to provide a seating structure in the
will move over the surface as the cordal length of the
form of a frame having spaced opposed sides and spring
arch 22 varies.
wire elements bridging said frame, the elements being in
in FIGS. 2 and 3 is shown the manner in which the
the form of arched linear wire portions having the ten
spring element 20 of FIG. 1 may be adapted to other
45
sion portions generally disposed normal to the plane of
forms of supporting frames. A tubular frame 36 is shown
de?ection of the arched portion and resting upon the
in FIG. 2 having holes 32 to receive the L-shaped exten
frame, the tension portions having turned hinge and
sion 34 of the torsion bar portion 36. To compensate
anchor portions extending into the frame to permit the
for the thin wall of the frame 30, the extension 34 has a
torsion portion to hinge in a plane substantially normal
turned foot 38. In PEG. 3 the spring structure of FIG. 2
to the plane of de?ection of the arched portion and to 50 is shown adapted to an angular frame 40 having holes 42
hold one end of said torsion bars against torsional rota
in one ?ange thereof.
tion about their longitudinal axis relative to the frame.
Having thus described my invention what I claim is
A still further object of the invention is to provide a
novel and desire to protect by Letters Patent is:
seating structure of spring wire elements in which the
l. A seating structure comprising a frame having
elements are unstressed in a non-load supporting state
and an arched linear spring portion has a torsional as
well as a hinged association with the frame structure
spaced opposed portions, spring wire elements bridging
said portions, said elements being in spaced parallel ar
rangement, each element consisting of a bridging portion,
whereby the cordal length of the arched spring between
integral lateral torsion ‘bar portions having a direct junc
its points of support is capable of being varied in a novel
60 tion with opposite ends of said bridging portion and pro
manner and stability under load is provided.
viding the supporting bases therefor and resting upon said
These and other objects and advantages residing in the
frame
portions, lateral extension portions having a direct
present invention will appear from the following speci?
junction with said torsion bar portions having a hinge
cation and the appended claims.
and anchor connection with said ‘frame portions to per
In the drawings,
FIG. 1 is a fragmentary perspective view of a seating 65 mit said torsion bar portions to hinge in a plane substan
tially normal to the plane of de?ection under load of
structure embodying the present invention for Wooden
frames,
FIG. 2 shows a modi?ed form of the invention applied
said bridging portion, said extension portions being sub‘
stantially parallel to said plane of de?ection, the connec
tion between said bridging portion and said frame portion
to a tubular frame, and
FIG. 3 shows a modi?cation of FIG. 2 applied to an 70 other than said lateral extension being a sliding connec
angular frame.
In FIG. 1 is shown a seating structure 10 having a
tion upon surfaces of said frame.
. In a seating structure, spaced frame portions, a
3,035,828
.
a
plurality of spring wire load supporting elements, said
elements being Z-shaped with lateral torsion bar portions
disposed at opposite ends and upon opposite sides of an
arched load supporting portion, said torsion bar portions
having lateral extensions for hinging and torsion resisting
anchorage, said lateral extensions being substantially par
allel to the plane of de?ection of said arched portions
4. In a seating structure, spaced frame portions, a
resilient load supporting element bridging said frame por
tions and resting thereon for relative sliding movement,
said elements having a bridging portion, L-shaped torsion
bars and hinge portions at opposite ends of said bridging
portion, said torsion bars having their longitudinal axes
disposed substantially normal to the plane of deflection
of said elements under load and said hinged portions
under load, and socket means in said frame portions in
being disposed substantially parallel to said plane and
which said last lateral extensions are received for hingedly
supporting said torsion bar portions and for resisting 10 socket means in said irame portions to receive the ends
of said L-shaped portions most removed from said bridg
torsional stresses placed thereupon when said arched por
ing portion to hingedly support said bridging portion and
tions are loaded.
to resist torsional stresses.
3. In a seating structure, spaced frame portions, a
5. In a seat structure as de?ned in claim 4 wherein
plurality of spring Wire load supporting elements, said
elements having lateral torsion bar portions disposed at 15 said torsion bars and hinged portions are located on
opposite ends of an arched load supporting portion and
having their longitudinal axes disposed substantially nor
mal to the plane of de?ection of said elements under load
said torsion bar portions having lateral extensions dis
posed substantially parallel to said plane ‘for hinging re
sisting anchorage, and socket means in said frame por
tions in which said last lateral extensions are received
for hingedly supporting said torsion bar portions and for
resisting torsional stresses placed thereupon when said
25
arched portions are loaded.
opposite sides of a longitudinal axis of said element.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,622,661
Markle ______________ ___ Dec. 23, 1952
2,719,578
Flint ______ _,_ _________ __ Oct. 4, 1955
2,870,823
Staples _______________ __ Jan. 27, 1959
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