U.S. patent application number 12/577724 was filed with the patent office on 2011-04-14 for seat frame for a folding chair.
Invention is credited to Mei Chuen Lin, Tzu Mei Wang.
Application Number | 20110084537 12/577724 |
Document ID | / |
Family ID | 43854255 |
Filed Date | 2011-04-14 |
United States Patent
Application |
20110084537 |
Kind Code |
A1 |
Lin; Mei Chuen ; et
al. |
April 14, 2011 |
Seat Frame For A Folding Chair
Abstract
A seat frame for a folding chair includes a support rail of an
increased size that extends from a bottom edge of the seat frame
toward a central area of the seat frame. The support rail is used
for placing a seat cushion of the folding chair thereon. A
plurality of through-holes is formed on the support rail, and a
plurality of threaded holes is formed through a bottom of the seat
cushion corresponding to the through-holes. When the seat cushion
is placed on the support rail, the threaded holes are in alignment
with the through-holes, and a plurality of fasteners are engaged
via the through-holes with the threaded holes so as to directly fix
the seat cushion on the support rail of the seat frame. The
strength of the seat cushion for sustaining a load can be thereby
enhanced.
Inventors: |
Lin; Mei Chuen; (Taoyuan,
TW) ; Wang; Tzu Mei; (Taoyuan, TW) |
Family ID: |
43854255 |
Appl. No.: |
12/577724 |
Filed: |
October 13, 2009 |
Current U.S.
Class: |
297/452.18 |
Current CPC
Class: |
A47C 4/24 20130101; A47C
7/185 20130101 |
Class at
Publication: |
297/452.18 |
International
Class: |
A47C 7/02 20060101
A47C007/02; A47C 4/00 20060101 A47C004/00 |
Claims
1. A seat frame for a folding chair, comprising: a support rail of
an increased size that extends from a bottom edge of the seat frame
toward a central area of the seat frame, the support rail being
used for placing a seat cushion of the folding chair thereon,
wherein a plurality of through-holes are formed on the support
rail, a plurality of threaded holes are formed through a bottom of
the seat cushion corresponding to the through-holes, and a
plurality of fasteners are engaged via the through-holes with the
threaded holes so as to fix the seat cushion on the support rail of
the seat frame, whereby enhancing a strength of the seat cushion
for sustaining a load.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention generally relates to a seat frame for
a folding chair, and more particularly to a folding chair having a
backrest and a seat cushion including a foam material, the seat
cushion being directly fixed on a seat frame.
[0003] 2. The Prior Arts
[0004] FIG. 1 is an exploded view showing a conventional folding
chair. A seat cushion A of the folding chair includes a cushion
portion and a wooden base A1. The cushion portion has multiple
layers of foam or like soft materials enveloped by a layer of
leather. A plurality of internally threaded rivets B is then used
to fix the cushion portion onto the wooden base A1, thereby forming
the seat cushion A.
[0005] The metal seat frame C has a support rail C1 at the
periphery thereof Usually, a width h1 of the support rail C1 is
only about 1 cm. When the seat cushion A is assembled with the seat
frame C, fasteners having larger diameters can not be used as
fixture. As a result, Z-shaped brackets D are used to fix and
support the seat cushion A. As shown in FIG. 1, the seat cushion A
is placed on the support rail C1 of the seat frame C. A side of the
bracket D overlaps with a bottom side of the support rail C1
whereas another side of the bracket D overlaps with a lower surface
of the base A1 of the seat cushion A. A plurality of fasteners E is
then inserted through the brackets D to engage with the internally
threaded rivets B of the base A1. The seat cushion A can thereby be
securely fixed onto the brackets D.
[0006] However, the seat cushion A is not directly fixed on the
seat frame C. Instead, the seat cushion A is placed on the support
rail C1 and fixed with the brackets D. In turn, the brackets D are
only fixed with the seat cushion and do not have any locking
connection with the seat frame, which only acts to clamp the
brackets D. As a result, after the seat cushion is used for a long
period of time, the brackets D may deform, rust or loosen, which
may deteriorate its fixing with the seat cushion. The seat frame of
the conventional folding chair therefore cannot provide strong
support for sustaining heavier load.
SUMMARY OF THE INVENTION
[0007] A primary objective of the present invention is to provide a
structure in which the seat cushion is directly fixed on the seat
frame so as to overcome the foregoing disadvantages regarding the
assembly between the seat cushion and the seat frame, and increase
the bearing load of the seat cushion.
[0008] To achieve the objective mentioned above, a seat frame for a
folding chair according to the present invention includes a support
rail of an increased size that extends from a bottom edge of the
seat frame toward a central area of the seat frame, the support
rail being used for placing a seat cushion. A plurality of
through-holes is formed on the support rail, and a plurality of
threaded holes is formed through a bottom of the seat cushion
corresponding to the through-holes. A plurality of fasteners is
engaged via the through-holes with the threaded holes so as to fix
the seat cushion on the seat frame.
[0009] The support rail has an increased width allowing engagement
of the fasteners for directly fixing the seat cushion on the
support rail of the seat frame. As a result, the seat frame has
enhanced strength for sustaining a load thereon.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The present invention will be apparent to those skilled in
the art by reading the following detailed description of a
preferred embodiment thereof, with reference to the attached
drawings, in which:
[0011] FIG. 1 is an exploded view illustrating a conventional
folding chair;
[0012] FIG. 2 is a perspective view illustrating a folding chair
having a seat frame according to an embodiment of the present
invention;
[0013] FIG. 3 is an exploded view illustrating the folding chair of
FIG. 2; and
[0014] FIG. 4 is another exploded view illustrating the folding
chair of FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0015] Referring to FIGS. 2 and 3, a seat cushion 2 of a folding
chair include a wooden base 21 formed from plywood or other wood
material, a plurality of layers of foam or like soft material
disposed on the wooden base 21 and leather encapsulating the wooden
base 21 and the foam or like soft material. Studs securely fixed
the wooden base 21 with the leather. A backrest cushion 1 of the
folding chair has a structure similar to that of the seat cushion
2.
[0016] FIGS. 2, 3 and 4 are explosive views showing a folding chair
having a seat frame 3 according to an embodiment of the present
invention. The seat frame 3 has a size corresponding to the seat
cushion 2. A bottom edge of the seat frame 3 includes a support
rail 31 of an increased size that extends toward a central area of
the seat frame 3. More particularly, the support rail 31 has an
extended width h2 of about 1.8 cm for improved support. However,
the extended width h2 is not limited to 1.8 cm (the support rail of
a conventional folding chair is about 1 cm). The seat cushion 2 is
placed on the support rail 31. In order to directly fix the seat
cushion 2 on the seat frame 3, a plurality of internally threaded
rivets 4 or threaded holes is formed through the base 21 of the
seat cushion 2, which respectively correspond to a plurality of
through-holes 32 formed through the support rail 31 of the seat
frame 3. A plurality of fasteners 5, such as screws, can be
respectively engaged via the through-holes 32 with internally
threaded rivets 4 or threaded holes so as to attach the seat
cushion 2 on the support rail 31 of the seat frame 3. If necessary,
the seat cushion 2 can also be removed from the support rail 31.
Because the seat cushion 2 is directly fixed on the support rail
31, the seat cushion 2 has enhanced strength for sustaining a load
thereon.
[0017] Although the present invention has been described with
reference to the preferred embodiment thereof, it is apparent to
those skilled in the art that a variety of modifications and
changes may be made without departing from the scope of the present
invention which is intended to be defined by the appended
claims.
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