U.S. patent number 3,765,718 [Application Number 05/216,637] was granted by the patent office on 1973-10-16 for folding chair.
Invention is credited to Chin Shu Chen.
United States Patent |
3,765,718 |
Chen |
October 16, 1973 |
FOLDING CHAIR
Abstract
A folding chair having a back with an upright member with a
cross member attached together by means of a fastener which locks
the cross member to the upright member at right angles when the
chair is erected and which allows the cross member to rotate with
respect to the upright member and slide toward its midpoint to a
closed position when the chair is folded. The upright member when
folded to its closed position also serves as a carrying handle for
the folding chair.
Inventors: |
Chen; Chin Shu (Ann Arbor,
MI) |
Family
ID: |
22807871 |
Appl.
No.: |
05/216,637 |
Filed: |
January 10, 1972 |
Current U.S.
Class: |
297/17; 297/298;
297/353 |
Current CPC
Class: |
A47C
4/52 (20130101) |
Current International
Class: |
A47C
4/00 (20060101); A47C 4/52 (20060101); A47c
004/04 () |
Field of
Search: |
;297/17,16,51,296,298,353,306,300,460,284 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Zugel; Francis K.
Claims
What is claimed is:
1. A folding chair comprising a frame having front, rear, and side
portions and a seat portion which define a chamber, and extensible
legs and a back member mounted on said frame for folding within
said chamber, wherein said back member comprises an upright member,
a cross member, and a fastener means which connects said cross
member to said upright member to permit folding said cross member
in line with said upright member for folding said back member into
said chamber and rigidly connects said cross member to said upright
member when said back member is in its erected position, said
upright member being a U-shaped rod with a closed upper end and
open lower terminal ends, said U-shaped rod being pivotally
connected at its terminal ends to said rear portion of said frame
and including retention means for retaining the pivotally connected
rod in its upright position, said retention means being releasable
so that said U-shaped rod can be pivoted to its folded position,
the length of said U-shaped rod being such that its closed upper
end projects beyond said front portion to provide a handle for
carrying the chair in its folded position.
2. A folding chair comprising a frame having front, rear, and side
portions and a seat portion which define a chamber, extensible legs
and a back member foldably mounted on said frame and adapted for
folding within said chamber, said back member including an upright
member, a cross member, and a fastener means which swivally and
slidably connects said cross member to said upright member for
folding into said chamber and rigidly connects said cross member to
said upright member when said chair and said back are unfolded,
said upright member including a U-shaped rod which defines a
channel and has a closed semi-circular upper end, said fastener
means including a cylindrical means mounted on said cross member
and disposed within said channel and a locking means for locking
said cylindrical means at said upper end of said channel so that
said cross member is locked in non-rotating relationship with said
upright member, said cylindrical means having a concave
circumference which engages said channel and conforms in shape to
said one end of said channel.
3. The folding chair that is defined in claim 2, wherein said
locking means comprises a horseshoe-shaped member pivotally mounted
on said cross member and adapted to move from an unlocked position
within said cross member to a locked position in which said
horseshoe-shaped member overlaps a portion of said concave
circumference of said cylindrical means and said U-shaped rod
disposed thereabout.
4. The folding chair that is defined in claim 1, wherein said front
portion of said frame has a notch into which said U-shaped rod fits
when the chair is in its folded position.
5. The folding chair that is defined in claim 1, wherein said
fastener means includes a bracket member fastened to said cross
member and slidably mounted on said upright member for movement
between said closed upper end and lower portions of said rod, and a
clasp member pivotally mounted on said cross member for pivotal
movement between a first position recessed within said cross member
and a second position enclasping said closed upper end of said
rod.
6. The folding chair that is defined in claim 5, wherein said cross
member is connected to said bracket member for relative rotational
movement so that said cross member can be rotated to a position in
alignment with said upright member when said clasp member is in its
first position.
7. A folding chair comprising a frame having front, rear, and side
portions and a seat portion which define a chamber, and extensible
legs and a back member mounted on said frame for folding within
said chamber, wherein said back member comprises an upright member,
a cross member, and a fastener means which connects said cross
member to said upright member so as to permit folding said cross
member in line with said upright member for folding said back
member into said chamber and rigidly connects said cross member to
said upright member when said back member is in its erected
position, said upright member being a U-shaped rod with a closed
upper end and open lower terminal ends, said U-shaped rod being
pivotally connected at its terminal ends to said rear portion of
said frame and including retention means for retaining the
pivotally connected rod in its upright position, said retention
means being releasable so that said U-shaped rod can be pivoted to
its folded position, said fastener means including a bracket member
fastened to said cross member and slidably mounted on said upright
member for movement between said closed upper end and lower
portions of said rod, and a clasp member pivotally mounted on said
cross member for pivotal movement between a first position
disengaged from said rod and a second position enclasping said
closed upper end of said rod.
8. The folding chair that is defined in claim 7, wherein said
bracket member has a pivotal connection with said cross member so
that the latter can be pivoted to a position in alignment with said
upright member for folding of said back member into said chamber.
Description
BACKGROUND OF THE INVENTION
The present invention relates to chairs and more particularly to
foldable chairs which can be collapsed into compact, easily carried
units. In the design of a folding portable chair, it is important
that the chair, when folded, be compact and easy to carry. In prior
art units, efforts have been made to realize this objective by
collapsing the legs and back of the chair into the seat portion to
obtain a flat, essentially rectangular shaped configuration.
However, solutions for fitting the back within the confines of the
seat portion have not been entirely satisfactory.
SUMMARY OF THE INVENTION
The present invention provides a construction and arrangement of a
folding chair which utilizes in an optimum manner the internal
space of the seat portion to overcome the problems inherent in
prior art units.
The invention provides a folding chair which has an essentially
rectangular seat and frame within which the legs and back fold to
form a flat compact structure which is easy to carry. To utilize
the internal space most efficiently the back of the chair comprises
two parts, an upright member which folds and is locked at its base
and a cross member which is attached at the opposite end of the
upright member to form a T-shaped back. When the chair is folded,
the cross member is unlocked from its erected position, rotated to
an essentially parallel position with respect to the upright
member, and moved toward the midpoint of the upright member. The
upright member is then folded at its base to lay across the length
of the seat. When folded in this position the upright member
protrudes at the front edge of the seat to form a handle and the
back is positioned in the space defined between the folded
telescoping legs of the chair.
Thus, it is among the objects of this invention to provide an
improved back for a folding chair. Other objects of this invention
will appear in the following description and appended claims,
reference being had to the accompanying drawings forming a part of
this specification wherein like reference characters designate
corresponding parts in the several views.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the folding chair showing the
underside with the legs and back folded to a closed position;
FIG. 2 is a perspective view of the folding chair showing the
topside when the chair is folded;
FIG. 3 is a perspective view similar to FIG. 1 with the back
partially unfolded;
FIG. 4 is a sectional view of the back fastener assembly as seen
along line 4--4 of FIG. 3;
FIG. 5 is a fragmentary perspective view of the back showing a
portion of the fastener connection for the back;
FIG. 6 is a perspective view of one component of the fastener
connection removed from the back; and
FIG. 7 is an inverted perspective view of the folding chair in its
erected configuration.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Before explaining the present invention in detail, it is to be
understood that the invention is not limited in its application to
the details of construction and arrangement of parts illustrated in
the accompanying drawings, since the invention is capable of other
embodiments and of being practiced or carried out in various ways.
Also, it is to be understood that the phraseology or terminology
employed herein is for the purpose of description and not of
limitation.
Referring to the drawings, a folding chair 10 has an essentially
rectangular frame 12 with telescoping front legs 14 and telescoping
rear legs 16 pivotally attached by means of brackets 18 and 20,
respectively. The legs 14 and 16 are telescoped and held by means
of a pin or plunger 22 in each leg. The front legs 14 are
maintained parallel by a support plate 24, and the rear legs 16 are
maintained parallel by a support plate 26. Support flaps 28 and 30
are hinged to the frame 10 and swing out to contact the plates 24
and 26 and thus hold the legs 14 and 16 in their erected positions
in which the legs abut indentations 32 as seen in FIG. 7.
A back member 34 comprises a flexible U-shaped rod 35 pivotally
attached at its lower terminal ends to the frame 12 by means of
hollow notched ferrules 26. The U-shaped rod 35 has projections 38
which provide retention means to engage the frame 12 in the holes
40 when the U-shaped rod 35 is in its erected position and is being
forced outward into the notched portion of ferrules 36 by
compression of spring 42 as best seen in FIG. 7.
A cross member 44 comprises part of the back member 34 and is
attached to the U-shaped rod 35 by means of a bracket or fastener
46 which is journaled in the cross member 44 and has its periphery
engaged within the channel 48 defined within the U-shaped rod 35.
The cross member 44 has a horseshoe-shaped cutout 50 disposed
around the fastener 46, and a horseshoe-shaped clasp 52 is
pivotally mounted by pins 53 along an axis 54 in the cutout 50.
The fastener 48 operates in conjunction with the clasp 52 to secure
the cross member 44 in an essentially rigid position at the top of
the U-shaped rod 35. This is accomplished when the clasp 52 pivots
out of the plane of the cross member 44 in response to gravity and
overlaps the U-shaped rod 35 and the fastener 46 as seen in FIG. 7.
The U-shaped portion of the clasp 52 and the closed upper end of
the rod 35 are thus engaged to inhibit rotation therebetween. When
the clasp 52 is manually pushed back into the cutout 50, the cross
member 44 can rotate freely on the fastener 46. With the cross
member 44 rotated parallel to the U-shaped rod 35, the clasp 52 is
held in a retracted position by the U-shaped rod 35 contacting the
clasp 52 (FIG. 4) and the cross member 44 can be moved along the
channel 48 defined between the upright legs of the rod 35 to a
midway position for folding, as shown in FIG. 3.
When the back 34 is folded to the closed position shown in FIG. 1,
and there is tension on the rod 35 at the ferrules 36, the cross
member 44 can be moved toward the front of the frame 12 (FIG. 1)
where it is frictionally held under a lip 56 and thus inhibit the
folding chair 10 from accidentally unfolding while being
carried.
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