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Патент USA US2107993

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Feb. 8, 1938.
M. Fox
2, 107,993
Filed Jan, 13, lese
2 Sheets-Sheet 1
Feb. 8, 1938.
Filed Jan. 13, 1956
2 Sheets-Sheet 2
Patented Feb. 8, 1938
som BED
Martin Fox, Chicago, lll., assignor to The Seng
Company, Chicago, lll., a corporation of Illi
Application January 13, 193s, serial No. 58,360
9 Claims.
This invention relates in general to improve
ments in convertible furniture and more particu
larly. to a hinged structure in which two uphol
stered sections are connected at right angles to
5 form a seat and are moved into alignment to
form a bed.l
' ._
-In convertible furniture of this type ‘as pre
(Cl. 5-47)
This invention relates to a folding seat struc
ture in which there are two sections mounted in
a frame 6 supported at the ends by legs or'by end
frames -[which form arm rests. 'In the arm rest
type the structure is usually called a bed daven
port and when the end arms are omitted it may
_be referred to 'as-a studio couch. In either form
viously used, the sections have been directly con- ’ `the sections are so connected that when the back '
nected thereto, holding them at fixed distances
10 in both. limiting positions. While this may have
is raised as- shown in Fig. l, lt is rigidly held in
position 4against movement in either Adirection 10
been satisfactory for nat, hard seats or solid - with respect to the seat section, and the sections
frame sections, it does not suit the modern type
of upholstered furniture with soft projecting or
spring filled cushions 'which extend above the
15 frames, and a variable hinge must be provided to
position the adjacent upper edges of the sections
closely together as a bed,.and to locate one of
these edges at a distance. below but close to the
other section to obviate an objectionable crack
or recess between them when used as a seat.
_must first be moved together by raising lthe seat
section or lowering the back section to the posi
tion approximately shown in Fig. 2, before the
sections are automatically _unlocked and the seat 15
section can be _lowered _to a position in alignment
as shown- In Fig. 3.
Referring now more particularlyv to the draw
ings, the seat section comprises> a marginal frame
8 with an upholstered portion 9 projecting from it
An important object of this invention is there- » _ on all sides. The back section comprises a similar
fore to provide a foldable sectional structure in
which the distance between the adjacent edges
of the sections are varied as they are swung from
one position to the other.
A further object of the invention is in the pro- '
vision of a spacing hinge structure for upholstered
sections in which the adjacent edges of the sec'
tions are close together when they are in align
ment to form a bed, and the same edges of the
sections are moved one behind and below the
other when the sections are changed. to form a
Other and further objects of the invention are;
to provide a compound spacing hinge for con
necting adjacent upholstered sections;~ to im
prove the locking pawl; to provide substantially
’ parallel link and carrier arms; to oñset one vof
the leaf pivots; to provide aback section stop;
and in general to produce the construction herein
shown and described.
In the accompanying drawings illustrating a
preferred embodiment of the invention,
Fig. 1 is a side elevation of a sofa bed struc-ture in seat position with the adjacent arm or
end rest omitted;
Fig. 2 is a broken elevation of the sections with
the back section in lowered position and the
frame I0 with an upholstered -cushion structure
Il secured thereto and projecting from it at one
side of the fame.
These cushion structures may ~
have yielding springs l2 or any other upholstering
construction to make the seat soft and com
fortable. Attached at each end of the seat and
back frames are hinge leaves or plates I3 and
I4 respectively, the seat plate having a projec
tion I5 to offset a rivet I6 therein adjacent the
back section.' A hinged lever I1 is connected
by the pi'vot I6 to the-plate I3 at one end and at
the other end the lever is connected by a pivot
I8 to one endof a short link I9, the other end of
which is connected by a pivot 20 to the other
plate I4. Similarly the plate I4 is connected by
means of a lever 2| having a pivot 22 at one
end engaging the plate I4 at a distance from
the edge of the plate and from the edge of the
back section, and the other end of this lever is
connected by a pivot 23 with one end of a link
24, the other end of which is connected by a pivot
25 with the plate I3. The two levers I‘I and
2| are pivotally connected intermediate their ends
by a pivot 26 so that the hinge plates thus -joined
constitute a compound spacing hinge with a
double connection between the plates at each
end of the sections to which they are connected.
seat section partially raised;
ì The seat and back sections are connected in
Fig. 3 is an end elevation showing, the sections
in position to form a bed;
Fig. 4 is a detail ,view showing the hinge lock
ing mechanism In one position; and
Fig. 5 is a detail view showing the hinge lock
their supporting frame 6 by means of a plate 30
attached adjacent the rear of the frame and sup
porting" arms 3I and 32 each pivoted at one end to
the plate 30 and at the other end to the plate It.
Between these arms on the plate 30 is a stud 33
which engages one of the arms 3I in its raised 55
55 ing mechanism in another position.
position as shown in Fig. 1, to limit the movement
of the arm in a rearward direction. These arms
being then unsustained drops to the _position o!
3| and 32 may be of substantially uniform length
and their pivot points are so located in the plates
to which they are connected that they auto
matically turn the back section from an inclined
raised position as shown in Fig. 1, to a horizontal
lowered position as shown in Figs. 2 and 3 when
the back section is bodily moved upon the arms.
In order to automatically lock and release
the sections, a latch 3| is pivoted at one end to one
of the levers 2| between its pivots 26 and I6 and
the other end of this latch is formed with a hook
35 adapted to engage a headed stud 36 secured
to an extension 3l of the plate |3 when the sec
tions are moved approximately to right angle
position. Also carried by the latch is a gravity
locking pawl 38 which has a pivot 39' interme
diate the ends of the latch 34 and a slot with
longitudinal and transverse portions 39 and 40
for engaging the same stud 36 and controlling
its latching operations with the hook 35. To
limit the movement of this locking awl in one
direction, a headless stud 4| projec from the
latch 34 and prevents further movement of the
Fig. 3 ready for re-engagement when it is desired
locking pawl in that direction.
In operation, assuming that the seat and back
sections are in alignment as shown in Fig. 3, the
latch 34 and its locking pawl 36 will be at their
30 lowermost positions with the stud 36 at the upper
end of the slot portion `39.
To raise the back section the front of the seat
section may first be raised causing the stud 36 to
raise the free end of the latch 34 until the notch
35 of the hook 35 engages the stud approximately in
the position shown by Fig. 2. In this position thc
seat and back sections are locked together at right
Yangles and may be rocked freely upon the sup
porting arms 3| and 32, and as the sections are
40 approximately balanced it requires very little
effort to move the sections to the raised back
position as shown in Fig. l.
To change the structure from a seat to a bed,
the backV Vsection may be pushed downwardly or
45 the seat section may be raised as shown in Fig. 2.
in which the sections are locked in position sub
stantially at right angles, but with the back a
little inclined as shown in Fig. l, and when the
movement of the seat section is continued after
50 the back is at rest in horizontal position, to a
position as shown approximately in Fig. 4, then
the stud rides along in the hook 35 and out of
to convert the bed to a seat. The extended tooth
on the latch ln positions similar to Fig. 4 limits
the relative motion of seat and back in one direc
tion while they may still be free to move relatively
in the opposite direction.
with this construction it will be seen that the
action and engagement of the locking pawl and
latch is entirely automatic, it depends upon the
position and operation of the seat sections and
because of the compound lever action between the
hinge leaves or> plates and the disposition of the
pivoting levers offset with respect to the edges of
the plates, the. adjacent edges of the upholstered
portions of the sections are’ moved closely to
gether when they are brought-into alignment as
shown more clearly by Figs. 3 and 5 so that a sub
stantially continuous sleeping surface is provided.
When the sections are moved at right- angles to
each other, the offset relation of the hinge parts
provides an offset relation of the adjacent up
holstered edges so that that of the back is dis
posed at a distance below the adjacent edge of 25
the seat section as shown more clearly in Figs. 1
and 4, so that. the lower upholstered edge of the
back section is behind and below but closely adja-l
cent to the rear edge of the seat section. This
construction makes it possible to provide this fold
ing structure for an upholstered seat bed of the
davenport or studio couch type and to prevent the
formation of an objectionable crack, space, or
opening between the sections even though the
seat section is considerably depressed» at its rear 35
I claim:
1. In a sofa bed, a seat section, a. back section,v
plates attached to adjacent edges of the sections,
one plate having a pivoting projection toward the
other and the other having a pivot inset from the
edge, a. pair of hinge levers pivotally connected to
each other intermediate their ends, one lever piv
oted at one end to the projection, the other lever
been pushed a trifle farther forward as shown in
pivoted at one end to the inset pivot, the projec 45
tion and the pivot it carries overlappingthe sec
tion to which the other plate is attached in one
position of the sections to bring them close to
gether, and link means for connecting the other
end of each lever to the opposite plate to swing
the opposite ends of the levers apart and to oiIset
the plates in a right angled position so that the
edge of one section will project over the adjacent
edge of the other.
2. In a sofa bed, seat and back sections, crossed 55
levers pivoted upon each other and one end of
each lever pivoted to one of the sections. the
other end of each lever having a link pivoted at
one end to the lever and at the other end to the
Fig. 4, is then pulled backward. The stud 36
then moves closer to the pivot of the latch 3l but
opposite section, the levers being pivoted to move
the sections together in alignment and to odset
as the transverse portion of slot 40 now bears on
stud 36 the latch 34 and pawl 33 now form a
them at right angles, so that the back section is
extended below the level of and close to the seat
the vertical portion 39 of the locking pawl until
the pawl 38 drops by gravity, so that the trans
55 verse portion 40 of its slot engages the stud 36.
In this position the back and seat sections can
be moved no closer together and the release of
the hook 36 takes place when the seat having
the pawl to take such a position and the latch
toggle with their common pivot out of the line
As these
last two pivot points move together the common
pivot is forced away carrying the latch relatively
upward until it is disengaged from the stud. The
latch is kept in the disengaged position by the
70 pawl, the pawl remaining in position until about
the position of Fig. 5Ais reached. In this position
pin 4| engages the pawl and during further move
ment to alignment either the pawl will drop
naturally by gravity so that the' stud 36 comes to
the then vertical slot 33 or the pin will compel
65 joining the stud and the latch pivot.
section, a projection on one of the sections. a lock
ing latch pivoted at one end to that lever directly 65
pivoted to the last named section and having a
hook at the other end for engaging the projection
when the sections are nearly at right angles and
lock them against relative movement into align~
3. In a sofa bed, seat and back sections, crossed
levers pivoted together intermediate their ends
and one end of each lever pivoted to one of the
sections, a link pivotally connecting the other end
ot each lever to- the opposite section, a projection 76
?xed on one section, a latch pivoted at one end to
the lever directly pivoted to this section having a
hook at its other end to engage the projection for
locking the. sections substantially at right angles
7. A convertible sofa bed, comprising back and
seat sections, a supporting frame therefor, a
hinging structure connecting the sections to move
the edges closely together when in alignment to
against relative movement in one direction, and
a locking pawl pivoted upon the latch and engag
ing the projection to release the hook from its said
form a bed and to offset the lower edge of the
back below the back upper edge of the seat sec~
tion when in seat position, means for locking the
locking engagement for returning the sections into
hinge parts against the movement of the sections
together in seat position, arms pivotally connect
ing the back section and the supporting frame 10
and for moving that section from upright to hori
4. In a structure according to claim 3, the „latch
and the pawl being mounted to engage and dis
engage by gravity, and the latch having a stud
to engage the pawl for releasing it from the pro
jection in one direction of movement.
5. A structure in accordance with claim 3 in
which the pawl has a closed slot engaging the
zontal position, and a projection ñxed on the sup
portingframe for engaging one of the arms to
support the back against rearward movement in
projection with angularly disposed portions par
allel to the length and transversely of the pawl,
the parallel portion holding the latch against
tions, comprising a plate for each section, hinge
levers one directly pivoted to each plate and piv
relative movement of the sections into alignment,
and the thrust of the transverse portion of the
slot against the projection throwing the latch up
out of such engagement with the projection to
allow movement of the sections into alignment.
6. In a convertible sofa bed, the combination
with back and seat sections, of a supporting
frame therefor, a hinging structure comprising
end plates >and crossed levers pivoted thereto and
connecting the sections for movement closely to
30 gether when in alignment and oiïsetting one of
the adjacent edges with respect to the other so
that the back section extends considerably below
the level of and ‘close to the seat section when
the sections are in seat position, and a pair of
the seat position.
8. A convertible sofa bed hinge for two sec
oted together between their ends, a link for each
lever pivoted at one end to the lever and at its
other end to the opposite plate, a projection
below the hinge on one plate, a latch pivoted to
the lever directly pivoted on that plate having a
hook to engage the projection as the plates are
moved apart, a 'carrier pawl pivoted on the latch
and having a slot to engage the projection, and
a stud on the latch to disengage the pawl in one
direction, the pawl and latch being otherwise
automatically operated by gravity.
9. A convertible sofa bed mounting compris 30
ing a structure in accordance with claim 8, with
a mounting plate attached to one of the hinge
plates by two arms pivoted at their ends to the
mounting plate and the hinge plate and located
arms both pivotally connected at one end to the
to move the hinge plate from a horizontal to a . Ll
supporting frame and pivoted at the other ends
to spaced points on the same end plate and op
vertical position, vthe mounting plate having a
erative to move the back section from an up
right to a horizontal position.
stud to engage one of the arms for limiting its
movement in that direction.
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