U.S. patent application number 10/259917 was filed with the patent office on 2004-04-01 for backrest assembly.
Invention is credited to Lin, Kuo-Hsiung.
Application Number | 20040061368 10/259917 |
Document ID | / |
Family ID | 32029587 |
Filed Date | 2004-04-01 |
United States Patent
Application |
20040061368 |
Kind Code |
A1 |
Lin, Kuo-Hsiung |
April 1, 2004 |
Backrest assembly
Abstract
A bracket assembly includes a backrest, a support and a
fastener. The backrest defines a hole with a wall formed with a
thread. The support is attached to a seat and defines a slot. The
fastener includes a bolt formed with a thread and a head secured to
the bolt. The bolt is inserted through the slot and the thread
formed on the bolt is engaged with the thread formed on the wall of
the hole in order to sandwich the support between the backrest and
the head so as retain the backrest in position on the support. The
engagement the thread formed on the bolt with the thread formed on
the wall of the hole can be loosened so as allow adjustment of the
position of the backrest on the support. In another aspect, the
backrest includes a first panel and a second panel. The first panel
defines a hole with a wall on which a thread is formed and a second
panel. The second panel defines a hole. The support is located
between the first panel and the second panel. The bolt is inserted
through the hole defined in the second panel and the slot. The
thread formed on the bolt is engaged with the thread formed on the
wall of the hole defined in the first panel in order to sandwich
the support between the first panel and the second panel so as
retain the backrest in position on the support.
Inventors: |
Lin, Kuo-Hsiung; (Nan Tou
City, TW) |
Correspondence
Address: |
Mr. Charles E. Baxley
CHARLES E. BAXLEY
59 John Street
New York
NY
10038
US
|
Family ID: |
32029587 |
Appl. No.: |
10/259917 |
Filed: |
September 30, 2002 |
Current U.S.
Class: |
297/353 |
Current CPC
Class: |
A47C 7/402 20130101 |
Class at
Publication: |
297/353 |
International
Class: |
A47C 007/40 |
Claims
1. A backrest assembly including: a backrest defining a hole with a
wall formed with a thread; a support defining a slot and being
attached to a seat; a fastener including a bolt formed with a
thread and a head secured to the bolt, wherein the bolt is inserted
through the slot and the thread formed on the bolt is engaged with
the thread formed on the wall of the hole in order to sandwich the
support between the backrest and the head so as retain the backrest
in position on the support, and the engagement the thread formed on
the bolt with the thread formed on the wall of the hole can be
loosened so as allow adjustment of the position of the backrest on
the support.
2. The backrest assembly according to claim 1 wherein the support
is a tube.
3. The backrest assembly according to claim 1 wherein the support
is a strip.
4. The backrest assembly according to claim 1 wherein the backrest
includes two ridges formed thereon, and the support is located
between the ridges so as to restrain rotation of the backrest on
the support.
5. The backrest assembly according to claim 1 wherein the fastener
includes a knob secured to the head in order to facilitate rotation
of the bolt.
6. A backrest assembly including: a backrest including a first
panel defining a hole with a wall formed with a thread and a second
panel defining a hole; a support including a first section attached
to a seat and a second section defining a slot and being located
between the first panel and the second panel; a fastener including
a bolt formed with a thread and a head secured to the bolt, wherein
the bolt is inserted through the hole defined in the second panel
and the slot, and the thread formed on the bolt is engaged with the
thread formed on the wall of the hole defined in the first panel in
order to sandwich the support between the first panel and the
second panel so as retain the backrest in position on the support,
and the engagement the thread formed on the bolt with the thread
formed on the wall of the hole can be loosened so as allow
adjustment of the position of the backrest on the support.
7. The backrest assembly according to claim 6 wherein the support
is a tube.
8. The backrest assembly according to claim 6 wherein the support
is a strip.
9. The backrest assembly according to claim 6 wherein the first
panel includes two ridges formed thereon, and the support is
located between the ridges so as to restrain rotation of the first
panel on the support.
10. The backrest assembly according to claim 6 wherein one of the
first and second panels includes a plurality of bosses and the
remaining one of the first and second panels defines a
corresponding number of recesses for receiving the bosses in order
to align the first pane with the second panel.
11. The backrest assembly according to claim 6 wherein the fastener
includes a knob secured to the head in order to facilitate rotation
of the bolt.
Description
BACKGROUND OF INVENTION
[0001] 1. Field of Invention
[0002] The present invention relates to a backrest assembly.
[0003] 2. Related Prior Art
[0004] Taiwan Patent Publication No. 148172 discloses a
backrest-elevating device. This conventional device is arranged
between a seat and a backrest 4. A cavity 12 is defined within a
frame-shaped portion formed on a rear face of the backrest 4. This
conventional device includes a support 2 connected with the seat. A
slot 21 is defined in the support 2. The slot 21 includes several
enlarged portions. A first mount 22 is flat in configuration. A
hole is defined in the first mount 22. A second mount 23 includes a
central portion and two terminal portions extend in a different
plane than a plane in which the central portion extends. A hole 24
is defined in the central portion of the second mount 23. When
assembled, the first mount 22 and the second mount 23 define a
space for receiving the support 2. The pin 25 includes a central
portion, an enlarged terminal portion formed as a head 251 and a
reduced terminal portion in which a groove 26 is defined. In
assembly, the pin 25 is inserted in the hole defined in the first
mount 22, the slot 21 and the hole 24. The head 251 is received in
the hole defined in the first mount 22 and one of the enlarged
portions of the slot 21. The central portion of the pin 25 is
inserted through the hole 24. The groove 26 is positioned beyond
the second mount 23. A spring 27 is mounted on the central portion
of the pin 25. A C-clip 28 is received in the groove 26 so that the
spring 27 is compressed between the second mount 23 and the C-clip
28. A button 3 is mounted on the reduced terminal portion of the
pin 25. The first mount 22 and the second mount 23 are secured to
the frame-shaped portion of the backrest 4. In use, the head 251 is
normally received in one of the enlarged portions of the slot 21 so
as to retain the position of the backrest 4 on the post 2. A user
can press the button 3 so as to remove the head 251 from the one of
the enlarged portions of the slot 21 in order to allow adjustment
of the position of the backrest 4 on the support 2. This
conventional device is extremely complicated in structure for
including a lot of components. Furthermore, the number of the holes
41 limits the number of the positions available for the backrest
4.
[0005] Taiwanese Patent Publication No. 480961 discloses a chair
with a simple mechanism for adjusting the elevation of a backrest.
This conventional chair includes a base 2, a seat 3 mounted on the
base 2, a support 4 connected with the seat 3, an adjusting device
5 movably mounted on the support 4 and a backrest 6 connected with
the adjusting device 5. The support 4 includes a plurality of holes
41 defined therein along a length (or height) thereof. The
adjusting device 5 includes a mount 51 with a central portion and
two terminal portions extend from the central portion at an angle.
The terminal portions of the mount 51 are secured to the backrest
6. A space 511 is defined by means of the mount 51 and the backrest
6. A hole 518 is defined in the central portion of the mount 51. A
lever 52 is pivotally mounted on the central portion of the mount
51. The lever 52 includes an insert 521 formed at an end and a
button 522 mounted on an opposite end. Normally, the insert 521 is
inserted in one of the holes 41 through the hole 518 so as to
retain the backrest 6 in one of several positions on the support 4.
A user can press the button 522 so as to remove the insert 521 from
the one of the holes 41 in order to allow adjustment of the
position of the backrest 6 on the support 4. This conventional
chair is complicated in structure for including quite a few
components. Furthermore, the number of the holes 41 limits the
number of the positions available for the backrest 4.
[0006] The present invention is therefore intended to obviate or at
least alleviate the problems encountered in prior art.
SUMMARY OF INVENTION
[0007] It is an objective of the present invention to provide a
backrest-positioning device that is simple in structure.
[0008] It is another objective of the present invention to provide
a backrest-positioning device that provides an indefinite number of
positions.
[0009] According to the present invention, a bracket assembly
includes a backrest, a support and a fastener. The backrest defines
a hole with a wall formed with a thread. The support is attached to
a seat and defines a slot. The fastener includes a bolt formed with
a thread and a head secured to the bolt. The bolt is inserted
through the slot and the thread formed on the bolt is engaged with
the thread formed on the wall of the hole in order to sandwich the
support between the backrest and the head so as retain the backrest
in position on the support. The engagement the thread formed on the
bolt with the thread formed on the wall of the hole can be loosened
so as allow adjustment of the position of the backrest on the
support.
[0010] In another aspect, the backrest includes a first panel and a
second panel. The first panel defines a hole with a wall on which a
thread is formed and a second panel. The second panel defines a
hole. The support is located between the first panel and the second
panel. The bolt is inserted through the hole defined in the second
panel and the slot. The thread formed on the bolt is engaged with
the thread formed on the wall of the hole defined in the first
panel in order to sandwich the support between the first panel and
the second panel so as retain the backrest in position on the
support.
[0011] Other objects, advantages, and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the attached
drawings.
BRIEF DESCRIPTION OF DRAWINGS
[0012] The present invention will be described through detailed
illustration of embodiments referring to the attached drawings.
[0013] FIG. 1 is a perspective view of a backrest assembly
according to a first embodiment of the present invention.
[0014] FIG. 2 is an exploded view of the backrest assembly.
[0015] FIG. 3 is a cross-sectional view of the backrest assembly,
showing a backrest in a lower position on a support.
[0016] FIG. 4 is a cross-sectional view of the backrest
assembly.
[0017] FIG. 5 is a cross-sectional view of the backrest assembly,
showing the backrest in an upper position on the support.
[0018] FIG. 6 is an exploded view of a backrest assembly according
to a second embodiment of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
[0019] Referring to FIGS. 1 and 2, according to a first embodiment
of the present invention, a chair includes a base 2, a seat 1
mounted on the base 2, a support 10 connected with the seat 1 or
the base 2, a backrest 3 and a backrest-positioning device 4
arranged between the support 10 and the backrest 3.
[0020] The support 10 is a tube including two slots 11 each defined
in one of two opposite faces thereof.
[0021] The backrest 3 includes a first panel 31 and a second panel
32. The first panel 31 includes a first face 311 and a second face
312. A soft pad (not shown) can be mounted on the first face 311 of
the first panel 31 in order to provide comfort for a user. Two
ridges 313 are formed on the second face 312 of the first panel 31.
A space 314 is defined between the ridges 313 in order to receive
the support 10. A hole 315 is defined in the second face 312 of the
first panel 31. The hole 315 is located between the ridges 313. A
thread is formed on the wall of the hole 315. Four bosses 316 are
formed on the second face 312 of the first panel 31.
[0022] The second panel 32 includes a first face 321 and a second
face 322. A recess 326 is defined in the second face 322 of the
second panel 32. A hole 325 is defined in the second panel 32. The
hole 325 is co-axial with the recess 326, i.e., they make a
so-called countersink hole. Four recesses 323 are defined in the
first face 321 of the second panel 32.
[0023] A fastener 4 includes knob 41, a hub 42 formed on the knob
41 and a bolt 43 with a first end fit in the hub 42 and a second
end formed with a thread. The knob 41 is used to facilitate
rotation of the bolt 43.
[0024] In assembly, the support 10 is received in the space 314.
The slots 11 are aligned with the hole 315. The second panel 32 is
located beside the first panel 31. The bosses 316 are received in
the recesses 323 for alignment of the first panel 31 with the
second panel 32. The hole 325 is aligned with the slots 11 and the
hole 315. The bolt 43 is inserted through a washer 44, the hole 325
and the slots 11 into the hole 315. The thread formed on the bolt
43 is engaged with the thread formed on the wall of the hole
315.
[0025] Referring to FIG. 3, the thread formed on the bolt 43 is
tightly engaged with the thread formed on the wall of the hole 315.
Thus, the hub 42 pushes the washer 44 that in turn pushes the
second panel 32 so as to sandwich the support 10 between the first
panel 31 and the second panel 32. Therefore, the backrest 3 is
retained in position on the support 10.
[0026] Referring to FIG. 4, the engagement of the thread formed on
the bolt 43 with the thread formed on the wall of the hole 315 is
loosened so as allow the second panel 32 to move from the support
10 due to elasticity of the second panel 32. The support 10 is no
longer sandwiched between the first panel 31 and the second panel
32. Hence, the position of the backrest 3 on the support 10 can be
adjusted arbitrarily provided that the bolt 43 is received in the
slots 11.
[0027] Referring to FIG. 5, the backrest 3 is moved to an upper
position on the support 10. The engagement of the thread formed on
the bolt 43 with the thread formed on the wall of the hole 315 is
tightened. Thus, the support 10 is sandwiched between the first
panel 31 and the second panel 32. Therefore, the backrest 3 is
retained in the upper position on the support 10.
[0028] FIG. 6 shows a backrest assembly according to a second
embodiment of the present invention. The second embodiment is
identical to the first embodiment except for including a solid
support 10 instead of a hollow support 10. Accordingly, only one
slot 11 is defined instead of two slots 11.
[0029] The present invention has been described through detailed
illustration of the preferred embodiments. Those skilled in the art
can derive many variations from the preferred embodiments without
departing from the scope of the present invention. Therefore, the
preferred embodiments shall not limit the scope of the present
invention defined in the attached claims.
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