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Патент USA US2577091

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Dec. 4, 1951
P, MONDY
2,577,089
ADJUSTABLE BACK REST FOR CHAIRS
Original Filed April 5, 1947
4’
2 SHEETS—-SHEET l
,
INVEN TOR.
Y - Peter Monéy
MBMgW
Dec. 4, 1951
2,577,089
P. MONDY
ADJUSTABLE BACK REST FOR CHAIRS
Original Filed April 5, 1947
2 SHEETS—SHEET 2
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INVENTOR.
PeTeP Nonciy
émméméy
2,577,089’
Patented Dec. 4, 1951
UNITED’ stares
2,577,089,
ADJUSTABLEMBACK BEST’ FQB.
Peter Mondy, ‘Detroit, Mich., assignor to 'Bur
ronghs. Adding. Machine Company, Detroit,
Mich, a ‘corporation of Michigan
Original appiication April. 5, .1947;_§eria1"‘No..
7395553.‘ Divided and this application (ictober
(Cl. 155*155)
1 .
.2
My invention relates generally. to chairs-and
bosses. l3a: formed near the top and on the inside
has. to do particularly with a tiltable back rest
adjustably mounted on a back-supporting frame
to provide maximum comfort for the: usercof' the
chair.
Thisapplication is a division of m-y-coepending
portion of ‘the backesupporting frame ..| Baby suit
able fastening means, for example screwsuiii.
Means is. carried on the rods i5 for supporting
the back cushion Matadjusted heights relative
to the back frame I13Pand seat cushion I2 for
application, Serial No; 739,553,‘ ?led. Aprili5, 19147,
maximum comfort of the user.
for‘ “Adjustable .Chairr”
An object of my invention is to provide» an im
comprises-a bracket vlL'I “disposed on the front side
of each rod IS in slidable and adjusted clamped
- proved chair of the,foregoing-character.
This means
.10 relation with its respective: supporting rod; The
Another object is~to provide-an adjustable back
brackets i '1; are made integral with a cross-con
rest for a chair whichvrmay be formedafrorn a
necting bar I8 disposed transversely with andon
-~re1_at_ively small number of simple and inexpene
the rear sideof the rods “I 5, such as by a weld l-?a
sive parts with a minimum of: machined or close
?tting'surfaces; and which-maybe assembled
whereby the brackets > are ?xed 'to- thercrossecon
15 .
nesting bar It in‘spaced relation at points on
readily with a minimum of ?tting or adjustment.
Another object is to. provide'a chair-having’ a
the brackets inwardly from the rods- I5 to form
the: slidable bracket-unit A. Each bracket H
vsimple and strong back-rest cushion supporting
has arcuately shaped portions 19- co-eX-tensive
mechanism which may be readily‘ adjusted to ‘a
with a portion of thefront surface of the rods
convenient height by the user and which permits 20 l5, whereby-- the-brackets and cross-connecting
rocking movement of the back cushion on its
bar I8 may ‘be’ guided and maintained in ?xed
support for increased comfort of the user as he
angular relation'with the rods- during theirv ad
shifts his position in the chair.
justing movement therealong. An ear element 20
Other objects and advantages of-theinvention
projectsoutwa-rdly from each bracket l1 and be
will appear from the following description taken ‘25. yond the'rods- l5 and has a transverse opening
in conjunction with the appended drawings,
adj acen-t-its end for freely receiving the threaded
wherein:
end of a knurled-headed thumb-screw‘2l. The
Figure 1 is a perspective view showing a chair
threaded end ofl-the thumb-screw 2-! is threadedly
constructed in accordance‘ with my invention and
received in the end of an Year- 22 provided by ex
with a portion of the tiltabl-e backrest cutaway '
showing. one of its adjustable and pivotai sup
port members;
tending the across-connecting bar [8 longitudi
nally in both directions to form areuate ‘portions
22a (Fig. Bipartially encircling the ‘rear-'side-of
Fig. 2 is an exploded perspective view-showing
the upper portion of the back-supportingframe
.of the chair shown in Fig. 1 with the tiltable
back-rest cushion indicated in broken ‘lines; and
the rods [5' and terminating in the cars 22 which
are disposed substantially parallel with the ears
Fig. 3 is atop plan viewin partial ‘section show
directed arm *23 having a; transverse opening 24
adjacent its front end-tojournal a pivot stud 25
secured inan ear-formed on a bracket-plate 26.
‘The bracket-plates 26 are provided‘ at their tops
and; bottoms‘ with an elongated opening 251
ing a portion ofjthe tiltable back rest withthe
pivotal and adjustable means for supporting it on
the upper portion ofthe chairrback-supporting
frame shown in Fig. 1.
.A. chair- embodying the present‘ invention is
illustrated in Fig. 1 and comprisesgenerally a
base In, a supporting post“ .rotatabiy mounted
2!!» and spaced rearwardly therefrom.
jEach
bracket‘il is- provided further with a forwardly
adapted‘to; receive suitable fastening means,v for
example screws‘ 28', for fastening the bracket:
p‘la-te
construction
to a rearallows
portionthe
29 vback
of the.cushion
cushion I'll
l4; to, be
‘locked at an adjusted height above the seat
cushion vl2 simply by tightening the thumb
for-adjustably supporting-a bracket-unit A‘. The
screws 2| in the adjusted position of‘the, arcuate
bracket-unit A
adapted to :pivotally support
portions I'9’and'22a along the rods l5 to cause
a tiltable back-rest cushion I4. at adjusted heights -:. these. ,arcuate portions to be securely clamped to
convenient to the user of, the chair.
‘
the rods and maintain the cushion, liat'aselected
The back-rest support or back-supporting
height where it is free to move angularly relative
in the base It, a seat I2 mounted on theseat- - .
supporting post H and a ‘back-supporting frame
l3 extending upwardly at the rear of the seat! 2
frame l3 (Fig. 2), preferably formed of a light
to the back frame l3 on the pivot studs 25.
cast metal such as aluminum, supports two rods
Means are provided for adjusting the angular
l5 disposed in parallel relation and secured to 55 position of the back-rest cushion Ill relative to
2,677,089
3
4
the back-supporting frame l3, which includes
rubber headed thumb-screws 30 carried in thread
ing a threaded opening adjacent each of said pro
ed collars 3| secured to the brackets 26.
bar and disposed on another side of said rods,
each of said clamping elements having a ?rst arm
projecting therefrom, said ?rst arm having an
opening adjacent its end in axial alignment with
the ‘threaded opening in said bar, locking means
jected ends, clamping elements integral with said
The
brackets 26 are mounted on the back of the cush
ion M in a position so that the pivot studs 25 are
located above the horizontal center line of the
cushion l4 and the weight of the cushion below
the said center line tends to maintain the cushion
in a vertical position unless held otherwise out
of this position by the rubber headed thumb
screws 3|] contacting in the channel portion of the
back-supporting frame i3. A rubber stop 32 se
cured to the back-supporting frame l3 adjacent
the top and on the front surface thereof is adapt
ed to be contacted by the back 29 of the cushion
if the said cushion is rotated counterclockwise
disposed in said openings to clamp said clamping
elements and said bar to said rods at selective
positionsv along said rods, a second arm projecting
forwardly from each of said clamping elements,
brackets secured to the back of said back rest
and supporting pivot elements journaled in said
second arms respectively to pivotally support said
back rest for angular movement relative to said
frame, and an adjustable resilient stop supported
on each of said brackets to limit the angular move
ment of said back rest in one direction and against
said frame.
(Fig. 2) a sufficient extent on its pivot studs 25.
The length of the lugs 23 and the rubber stop 32
is such that both the height and tilting adjust
ments are accessible to the user of the chair with
out danger of pinching the ?ngers or hands re
20
gardless of the angular ‘position of the cushion
which making said adjustments.
While I have shown and described herein one
form of structure embodying my invention, it will
‘be understood that changes in details and ar-'
rangements of parts may be resorted to without
4. In a chair having a back~supporting frame, a
back rest, spaced parallel elongate guides secured
to said frame in vertically extending position and
each spaced therefrom throughout a portion of its
length, a bar extending transversely of said guides
with the ends thereof projecting beyond said
guides, clamping elements integral with said bar
and disposed adjacent said guides, each of said
clamping elements having a ?rst arm projecting
laterally therefrom in registry with the projecting
departing from the spirit of the invention.
I claim:
1. In a posture chair of the type having seat 30 ends of said bar respectively, locking means en
gaging said clamping elements and said bar to
supporting means and a back-supporting frame
lock said bar on said guides at selected positions
extending upwardly therefrom, the combination
along said guides, a second arm projecting for
of a back rest mounting bracket unit having a
wardly from each of said clamping elements,
rigid cross-bar and spaced arms extending for
brackets secured to the back of said back rest
wardly therefrom, means supporting said mount;
pivotally connected to said second arms to support
ing bracket unit on said frame for vertical sliding
said back rest for locking movement relative to
adjustment thereon, a back rest, spaced pivot
said frame, and a stop means to limit angular
members rigidly secured to said back rest and
movement of said back rest in one direction and
pivotally journaled in said arms respectively for
against said frame.
pivotally mounting said back rest on said mount
5. In a posture chair having seat-supporting
ing bracket unit and rearwardly extending bump
er elements carried on said back rest and posi
tioned to abut said frame to limit pivotal move
ment of said back rest in one direction.
2. In a posture chair having seat-supporting
means and a back rest supporting frame extend
ing upwardly therefrom, a back rest, a back rest
mounting bracket unit having a rigid cross-bar
and spaced arms extending forwardly therefrom,
means and a backrest supporting frame extend
means for supporting said bracket unit in ver
clamp elements each partially embracing said
guides respectively for locking said mounting
tical slidable relationship on said supporting
frame and comprising a plurality of spaced guides
mounted on said frame, means for locking said
mounting bracket unit to said guides in adjusted
relationship thereon, a plurality of bracket ele
ments rigidly mounted on the back of said back
rest and having studs secured therein for piv
otally supporting said back rest to said ?rst
mounting bracket unit, an adjustable resilient
stop supported on said back rest below the pivot
axis of said studs to limit the pivotal movement 60
of said back rest in one direction, and a resilient
stop secured to the said supporting frame above
the pivot axis of said studs to limit the pivotal
movement of said back rest in the other direction.
ing upwardly therefrom, a back rest, a back rest
mounting bracket unit having a rigid cross-bar
and spaced arms extending forwardly therefrom,
means for supporting said bracket in vertical slid
able relationship on said supporting frame and
comprising a plurality of spaced elongate guides
mounted on said frame, means including elongate
bracket unit on said guides in adjusted relation
ship thereon, a plurality of bracket elements
mounted on the back of said back rest and piv
otally supporting said back rest on said mounting
bracket unit, and resilient stop means on each of
last said bracket elements to limit the pivotal
movement of said back rest in either direction.
PETER MONDY.
REFERENCES CITED
The following references are of record‘in the
?le of this patent:
'
"
UNITED STATES PATENTS
65
Number
Name
Date
3. In a ‘chair having a back-supporting frame, a
2,139,205
Powell ____________ __ Dec. 6, 1938
back rest, means on said frame for adjustably and
2,304,349
Fox ______________ __ Dec. 8, 1942
pivotally supporting a back rest, said means com
prising spaced parallel rods having their ends se
cured to said frame, a bar extending transverse
to and disposed on one side of said rods with the
ends thereof projecting beyond said rods and hav
FOREIGN PATENTS
Number
372,516
Country
Date
Great Britain ______ __ May 12, 1932
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