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Патент USA US2128210

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Aug. 23, 1938.
u. k. JOHANNSEN
2,128,210
FOLDING TABLE
Filed July 17, 1936
lll_l_l
l
INVENTOR.
U0 0 K. Jo/m lwvs EM,
' ATTORNEY.
Patented Aug. 23, 1938
2,128,210
UNITED STATES PATENT OFFICE
2,128,210
FOLDING TABLE
Udo K. Johannsen, Cortland, N. Y., assignor to
The Brewer-Titchener Corporation, Cortland,
N. Y., a corporation of New York
Application July 17, 1936, Serial No. 91,023
4 Claims.
Fig. 1 represents an elevational side view of an
tables of the fully automatic type and is more
particularly concerned with a collapsible iron
ing board stand comprising a three legged chassis
5 in which the legs are adapted to compactly fold
erected ironing board assembly equipped with my
?atwise underneath one face of such board and
to be manipulated in a simple manner.
A pair of complementary or so-called rear legs
have one end thereof directly pivoted to the top
10 board and a single inclined or so-called front
leg may be similarly attached in substantial
alignment with the axis of the rear leg pivots.
All my rigid legs are positively actuated in unison
between their respective erected and collapsible
15 positions by the use of a novel actuating gear.
Such controlled movement is herein brought
about by a manipulative primary toggle linkage
of which one free link end is pivoted to the rear
leg structure intermediate the ends thereof and
the other free end of which linkage is pivoted
underneath the board. The inclined front leg
is in turn pivotally hooked up by an auxiliary
toggle linkage that extends between said rear leg
structure and the ?oor contacting end of the
5 front leg.
Stop means prevent said auxiliary linkage from
reaching full toggle alignment in both the col
24)
lapsed and erected table positions. By this
means, the primary linkage may be freely ma
nipulated through a wide angular range Without
being stalled by its cooperating linkage.
i. .
bottom view of my chassis when fully collapsed. 5
Figs. 5 and 6 are fragmental details respec
tively taken along lines 5—5 and 6—~t of Fig. 1.
Referring more speci?cally to- the drawing, the
numerals l0 and Il respectively designate a pair
of laterally spaced rear legs.
The upper end of
each such leg is pivoted at l2 to one board face
l3. An intermediate pivot I4 is also located be
tween the respective ends of each rear leg.
This rear leg structure is preferably of a type
in which the ?oor contacting ends are widely
spread apart into the Fig. 2 position when the
chassis is unfolded. To this end, I may resort to
complementary brace straps such as l5 of which
one end is pivoted to a rear leg while each oppo
site strap end is pivotally attached by a metal
bracket to said one board face at l6 but in an ax
ially offset relation to the corresponding rear leg
pivot l2. When collapsed, the rear legs will then
fall within the board width con?nes in the Fig. 4
manner.
like links such as ll having one of their respec
tive free ends attached to an associated interme
diate pivot M, as shown. The opposite link ends
are pivotally adjoined at ill to a common guide
is especially suited for an understructure com
sion 2| arranged to thrust as a prop agency
prising wooden slats that may be operatively in
terconnected by simple hardware. Each such
rigid table leg combines ample stiffness with low
chassis weight that shall not prove burdensome
against the board face in erected leg position.
The guide link extension 22 is thereby kept
spaced outwardly away from said face» and its
terminal preferably provided with a cleared loop
or ?nger piece 23 by which to swing the link l9
through a wide angle of approximately 180° into
its folded position 18’. If preferred, the spaced
to women when carried to or from a storage
closet.
The object of the present invention is to pro
" vide for a sturdy folding table of the character
indicated and one possessing comparatively few
essential pivotal points that are not likely to be
come rickety from wear after extended use or al
low the superstructure to sway abnormally under
25
My primary or rear leg toggle linkage is of the
jack-knife type and may comprise a pair of strut
tacting leg ends simultaneous with the unfolding
thereof, The actuating gear herein resorted to
about a lateral spread on part of the floor con
.15
devices, and Fig. 2 is a rear end View thereof.
Figs. 3 and 4 respectively, show a side and a
link 19, preferably made out of a strip of wood
and the free end of which guide link is pivoted
to the board face at 20. The pivot i8 is purpose
ly disposed between the ends of such adjo-inecl
toggle links to provide for a strutlike link exten
In addition, my pair of rear legs are equipped
with pivotally offset brace straps which bring
.7
(Cl. 38—119)
My invention broadly relates to portable folding
link extension 22 may as a handle, be directly 45
grasped to perform a like function.
The inclined front leg 24 may be pivotally at
tached to the board coincident with the rear leg
pivot I2. As depicted in Figs. 2 and 4, said wood
its anticipated loading. My table improvements
en front leg may be bifurcated by the use of .
are further designed for rapid fabrication on an
extensive scale at a low productive cost.
Reference is had to the one sheet of drawings
which are illustrative of a preferred exempli?ca
companion slats of which the branched ends re
spectively lead to one of the complementary piv
ots l2 (see Fig. 4). A foot pivot 25 is located
closely adjacent to the converging lower or ?oor
tion and in which drawing:
contacting end of the leg 24. An auxiliary toggle 55
2
2,128,210
linkage of the collapsible type interconnects said
lapsible toggle linkage is not dependent upon the
pivot 25 with the intermediate pivot ill and as
such, may comprise a pair of relatively short
use of a loose ended tension rod of the conven
link components 26 and corresponding relatively
long or tension rod components 271 that are
jointed at 28, preferably by the use of a loose slot
connection.
As indicated in Fig. l by a dotted and dashed
reference line A, the components of said auxil
10 iary linkage when extended, are prevented from
reaching their respective aligned dead center po
sitions by the use of a common stop lug 2e.
Such
Other advantages inherent in my table chassis
are believed apparent to those skilled in this art,
it being obvious that the same underlying struc
tural principles may be used in associations other 0
than for ironing boards, and that various modi
fications in design may readily be resorted to in
likewise carrying out the illustrative embodiment,
abut the front leg. The linkage thereby obviates
a stalling of the primary linkage when the erected
table legs are to be collapsed and said stop lug
precludes such buckled toggle dropping through
particularly pointed out in the appended claims.
all without departing from the spirit and scope
of my invention, heretofore described and more
my complementary tension links 2i out of a one
I claim:
1. In a collapsible table or the like adapted to
unfold into erected position, a top board, a front
leg having one end region pivoted to one board 20
face, a foot pivot carried by the opposite end
region of the front leg, a rear leg structure also
piece metal rod that is given a bail shape (see
Figs. 4 and 5) of which the intermediate nose
means located on said structure between the ends
table legs be turned upside down during the fold
20 ing thereof.
'
As a further feature, it is preferred to form
portion 28 is threaded through the link slots
while the bail terminals are each outturned into
headed trunnions (see Fig. 6) that respectively
constitute the intermediate pivots M. The end
30
forwardly overhanging loop 23.
lug preferably spans the links 26 and is made to
the alignment position A even should the erected
25
tional slip type likely to become entangled when
a collapsed table is carried about. When folded,
the board may be conveniently hung up by the
of the wooden link I1 may be metal sheathed
by an apertured cap 30 to reduce trunnion wear.
The mode of folding my table legs is indicated
by dotted lines in Fig, 1. In erected table posi
tion, the guide link I9 is directed rearwardly
toward the pivot l2 and this brings the link ex
tension 25 into abutment with the board face
35
I3. The primary linkage then stands buckled
through its dead center position and by virtue
of the ?xed bracket pivot 28, the rear legs l0
and l I will be rigidly held against collapse. The
extended auxiliary toggle becomes tensioned
when the ironing board is loaded downwardly
but the linkage components are not allowed to
assume extended alignment because of the stop
‘lug 253. The weight of the toggle links 26 and
2'! are kept relatively light so as not to draw; the
45 front and rear legs together. When erected, the
board is kept exceptionally rigid under load,
partly because the foot pivot 25 is located near
the floor contacting end of the inclined leg 24
rather than in the mid region thereof where a
pivoted to the board face, supplementary pivot
thereof, a primary toggle linkage including a
strutlike link which intermediate its ends is piv
otally jointed to one terminal region of a manipu
lative guide link to provide for a strutlike link
extension, one end of the strutlike link being
mounted on the supplementary pivot and the op‘
posite terminal of the guide link being pivotally
attached to said face to permit of swinging the
jointed end of the guide link between extreme
shift positions respectively lying alongside said
face forwardly and rearwardly of such pivotal at
tachment, the strutlike link extension being dis
posed to thrust against the board face to retain
the erected rear leg structure against collapse
when the toggle linkage assumes a rearward posi
tion and which extension spacedly holds the
jointed end of the guide link away from said face,
a cooperative auxiliary toggle linkage comprising
a pair of jointed links pivotally suspended be
tween the foot pivot of the erected frontleg and
the retained rear leg structure, and stop means in
terposed between the front leg and one such sus
pendedlink serving to prevent toggle alignment
with the other suspended link, the toggle joint
of such auxiliary linkage being arranged to au
tomatically recede from said face when the guide
certain amount of lateral flexure would be ex
link is swung away from its extreme rearward
pected.
position.
A grasping of the ?nger piece 23 allows the link
Hi to be swung into its dotted depending posi
tion of Fig. 1 when the auxiliary linkage will par
tially collapse as shown in dotted outline and
thereby carry the front leg toward the board in
unison with a similar rear leg movement. When
the primary toggle joint i8 reaches its outer
most position i8’, the understructure assumes the
60 folded Fig. 4 position. In that relationship, the
stop lug 29 abuts a portion of the front leg 24
and again prevents the secondary toggle from
reaching its inverted dead center position; hence,
the linked understructure is kept free to unfold
by a reversal of the described guide link move
ments without any interlocking effects.
A noteworthy attribute of the present table
structure lies in its relatively simple linkage
70 adapted to automatically unfold from a central
ized manipulative point such as the link l9, and
still bring about a spreading of the rear legs.
In erected position, the several legs are automat
ically retained without need of any supplemen
75 tary latch device. In addition, the auxiliary co-l
2. In a collapsible table or the like adapted to
unfold into erected position, a top board, a front
leg having one end pivoted to the board, a footv
pivot on the opposite end region of the front'leg,
'a rear leg structure also pivoted to the board,
supplementary pivot means located between the
ends of said structure, manipulative link means
extending between the supplementary pivot and
the board serving to guide the rear leg structure
from collapsed into a retained erected position,
a cooperative toggle linkage comprising a pair
of jointed links pivotally suspended between the
foot pivot of the erected front leg and the re
tained rear leg, and stop means for one such sus
pended link serving to prevent toggle alignment
with the other suspended link, the interposed
toggle joint thereof being arranged to automati
cally recede from said face and being operative
by the manipulative link means toinitiate a col
lapsing movement on part of the several erected
legs.
'
3. In a collapsible table or the like adapted to
unfold into erected position, a top board, a front
(Hi
3
2,128,210
leg having one end region pivoted to the board, a
foot pivot on the opposite end region of the front
leg, a structure comprising a pair of rear legs
also pivoted to the board, a supplementary pivot
located between the respective ends of each rear
leg, manipulative link means extending between
the supplementary pivots and the board serving
to guide said rear legs between collapsed and
erected positions, and a toggle linkage disposed
10 between the foot pivot and said pair of rear legs
whereby the front leg is actuated in unison with
the guided rear legs, said linkage comprising a
pair of jointed link components of di?erent
lengths of which the free end of the shorter link
15 component is mounted on the foot pivot and the
free end of the longer link component is given
a unitary bail shape of which the bifurcated
terminal regions are respectively attached to a
different rear leg and arranged to constitute the
20 aforesaid supplementary’pivots thereof and the
medial nose region of which bail pivotally engages
the other end of the shorter link component to
constitute the toggle joint of such linkage.
4. In a collapsible table or the like adapted to
25 unfold into erected position, the combination of
a top board, a front leg having one end region
pivoted to one board face, a foot pivot carried
by the opposite end region of the front leg, a
rear leg structure also pivoted to said board face,
supplementary pivot means located on said struc
ture between the ends thereof, a primary toggle
linkage including a strutlike link having one end
pivotally jointed to one terminal region of a
manipulative guide link, the other end of the
strutlike link being mounted on the supplemen
tary pivot and the opposed terminal of the guide
link being pivotally attached to said face to per
mit of swinging the jointed end of the guide link
through its aligned dead center into a buckled 10
toggle position lying rearwardly of such pivotal
guide link attachment and wherein said toggle
linkage serves to retain the erected rear leg
structure against collapse, a cooperative aux
iliary toggle linkage comprising a pair of jointed 15
links of di?erent lengths pivotally suspended be
tween the foot pivot of the erected front leg and
the retained rear leg structure, and stop means
operatively interposed between the shorter link
and said front leg serving to prevent toggle align 20
ment with the longer link, the stop means being
disposed to automatically recede from said face
when the guide link is swung away from its
buckled position and the respective linkages be
ing so arranged that the primary linkage when
manipulated cannot become stalled because of
link alignment on part of the auxiliary linkage.
UDO K. J OHANNSEN.
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