U.S. patent application number 10/951097 was filed with the patent office on 2005-09-01 for multi-stage backrest assembly.
Invention is credited to Wu, Yao-Chuan.
Application Number | 20050189810 10/951097 |
Document ID | / |
Family ID | 51759429 |
Filed Date | 2005-09-01 |
United States Patent
Application |
20050189810 |
Kind Code |
A1 |
Wu, Yao-Chuan |
September 1, 2005 |
MULTI-STAGE BACKREST ASSEMBLY
Abstract
A multi-stage backrest assembly for a chair includes a support
frame, a back support mounted on the support frame, a head support
mounted on the support frame, and a waist support pivotally mounted
on the back support. Thus, the backrest assembly has a pivotable
function so as to fit the curve of the user's body ergonomically,
thereby providing a comfortable effect to the user. In addition,
the locking tube of the crossbar of the back support is adjustably
mounted on the respective support rod of the support frame, so that
the back support is adjustably mounted on the support frame to
adjust the height of the back support so as to fit users of
different statures.
Inventors: |
Wu, Yao-Chuan; (Min Xiung
Hsiang, TW) |
Correspondence
Address: |
NIKOLAI & MERSEREAU, P.A.
900 SECOND AVENUE SOUTH
SUITE 820
MINNEAPOLIS
MN
55402
US
|
Family ID: |
51759429 |
Appl. No.: |
10/951097 |
Filed: |
September 27, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10951097 |
Sep 27, 2004 |
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10746631 |
Dec 23, 2003 |
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6843530 |
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Current U.S.
Class: |
297/452.29 |
Current CPC
Class: |
A47C 7/38 20130101; A47C
7/40 20130101; A47C 7/405 20130101; A47C 7/46 20130101 |
Class at
Publication: |
297/452.29 |
International
Class: |
A47C 007/46 |
Claims
1. A multi-stage backrest assembly, comprising: a support frame; a
back support mounted on the support frame; a head support mounted
on the support frame; and a waist support pivotally mounted on the
back support; wherein the back support includes a backrest frame,
and a crossbar mounted in the backrest frame and secured on the
support frame; the back support further includes a first cover
mounted on the crossbar, a second cover mounted on the crossbar and
combined with the first cover, and an elastic bar having a first
end mounted between the first cover and the second cover and a
second end pivotally mounted to the waist support.
2. (canceled)
3. (canceled)
4. The multi-stage backrest assembly in accordance with claim 1,
wherein the first cover is formed with two screw bores, the first
end of the elastic bar is formed with two through holes, and the
back support further includes two locking screws each extended
through a respective one of the two through holes of the elastic
bar and each screwed into a respective one of the two screw bores
of the first cover, so that the elastic bar is fixed on the first
cover.
5. The multi-stage backrest assembly in accordance with claim 1,
wherein the first cover is formed with two screw holes, the
crossbar has a mediate portion formed with two through holes, and
the back support further includes two fixing screws each extended
through a respective one of the two through holes of the crossbar
and each screwed into a respective one of the two screw holes of
the first cover, so that the first cover is fixed on the
crossbar.
6. The multi-stage backrest assembly in accordance with claim 1,
wherein the first cover has a periphery formed with a plurality of
positioning holes, and the second cover has a periphery formed with
a plurality of positioning tenons each inserted into a respective
one of the positioning holes of the 'first cover, so that the
second cover is combined with the first cover.
7. The multi-stage backrest assembly in accordance with claim 1,
wherein the elastic bar is substantially V-shaped.
8. The multi-stage backrest assembly in accordance with claim 1,
wherein the elastic bar is pivotally mounted to the waist support
by a pivot member.
9. The multi-stage backrest assembly in accordance with claim 1,
wherein the elastic bar has a corrugated face to enhance the
elastic effect of the elastic bar.
10. The multi-stage backrest assembly in accordance with claim 1,
wherein the back support further includes a net mounted on the
backrest frame.
11. A multi-stage backrest assembly, comprising: a support frame; a
back support mounted on the support frame; a head support mounted
on the support frame; and a waist support pivotally mounted on the
back support, wherein the support frame has two substantially
L-shaped sections each having a distal end formed with a support
rod formed with a plurality of locking holes; the head support
includes a su port rack having a lower end formed with two mounting
tubes each mounted on the respective support rod of the support
frame, a support bar adjustably mounted on the support rack and
having a lower end mounted on an upper end of the support rack, and
a head frame pivotally mounted on an upper end of the support
bar.
12. The multi-stage backrest assembly in accordance with claim 11,
wherein the back support includes a crossbar having two ends each
formed with a locking tube adjustably mounted on the respective
support rod of the support frame, so that the crossbar of the back
support is secured on the support rods of the support frame.
13. (canceled)
14. The multi-stage backrest assembly in accordance with claim 111,
wherein the support rack is substantially inverted T-shaped.
15. The multi-stage backrest assembly in accordance with claim 11,
wherein the support bar is substantially inverted L-shaped.
16. The multi-stage backrest assembly in accordance with claim 11,
wherein the head support further includes a net mounted on the head
frame.
17. The multi-stage backrest assembly in accordance with claim 11,
wherein the head frame is pivotally mounted on the upper end of the
support bar by a pivot member.
18. The multi-stage backrest assembly in accordance with claim 1,
wherein the waist support is pivotally mounted on the back support
by a pivot member.
19. The multi-stage backrest assembly in accordance with claim 1,
wherein the waist support is provided with a net.
20. The multi-stage backrest assembly in accordance with claim 1,
wherein the support frame is substantially U-shaped.
Description
CROSS-REFERENCES TO RELATED APPLICATIONS
[0001] The present invention is a continuation-in-part application
of the co-pending U.S. Ser. No. 10/746,631.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a multi-stage backrest
assembly, and more particularly to a multi-stage backrest assembly
for a chair.
[0004] 2. Description of the Related Art
[0005] A conventional backrest for a chair has a fixed structure
that cannot be adjusted so as to fit the curve of a user's body
ergonomically, so that the user easily feels uncomfortable when
seated on the chair during a long period of time.
SUMMARY OF THE INVENTION
[0006] In accordance with the present invention, there is provided
a multi-stage backrest assembly, comprising:
[0007] a support frame;
[0008] a back support mounted on the support frame;
[0009] a head support mounted on the support frame; and
[0010] a waist support pivotally mounted on the back support.
[0011] The primary objective of the present invention is to provide
a multi-stage backrest assembly having a pivotable function so as
to fit the curve of the user's body ergonomically, thereby
providing a comfortable effect to the user.
[0012] Another objective of the present invention is to provide a
multi-stage backrest assembly, wherein the locking tube of the
crossbar of the back support is adjustably mounted on the
respective support rod of the support frame, so that the back
support is adjustably mounted on the support frame to adjust the
height of the back support so as to fit users of different
statures.
[0013] A further objective of the present invention is to provide a
multi-stage backrest assembly, wherein the support bar of the head
support is adjustably mounted on the support rack, so that the head
frame is adjustably mounted on the support rack to adjust the
height of the head support so as to fit users of different
statures.
[0014] A further objective of the present invention is to provide a
multi-stage backrest assembly, wherein when a user is rested on the
backrest assembly, the back support supports the user's back, and
the waist support supports the user's waist by the elastic effect
of the elastic bar which provides a cushion force to the waist
support so as to enhance the support effect of the waist support,
so that the user feels more comfortable.
[0015] A further objective of the present invention is to provide a
multi-stage backrest assembly, wherein the waist support is
pivotable relative to the back support, so that the inclined angle
of the waist support is adjustable so as to fit the user's
requirement.
[0016] A further objective of the present invention is to provide a
multi-stage backrest assembly, wherein the head frame of the head
support is pivotable relative to the support bar, so that the
inclined angle of the head frame of the head support is adjustable
so as to fit the user's requirement.
[0017] Further benefits and advantages of the present invention
will become apparent after a careful reading of the detailed
description with appropriate reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 is a perspective view of a multi-stage backrest
assembly in accordance with the preferred embodiment of the present
invention;
[0019] FIG. 2 is a partially exploded perspective view of the
multi-stage backrest assembly as shown in FIG. 1;
[0020] FIG. 3 is a partially exploded perspective view of the
multi-stage backrest assembly as shown in FIG. 1;
[0021] FIG. 4 is a partially exploded perspective view of the
multi-stage backrest assembly as shown in FIG. 1; and
[0022] FIG. 5 is a side plan view of the multi-stage backrest
assembly as shown in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
[0023] Referring to the drawings and initially to FIGS. 1-4, a
multi-stage backrest assembly for a chair in accordance with the
preferred embodiment of the present invention comprises a support
frame 1, a back support 2 mounted on the support frame 1, a head
support 4 mounted on the support frame 1, and a waist support 3
pivotally mounted on the back support 2.
[0024] The support frame I is substantially U-shaped and has two
substantially L-shaped sections each having a distal end formed
with a support rod 11 formed with a plurality of locking holes 12.
The support frame 1 has a mediate portion formed with a fixing
portion 13 mounted on a seat (not shown), so that the multi-stage
backrest assembly is mounted on the seat.
[0025] The back support 2 includes a backrest frame 20, a net 21
made of foam material or the like mounted on the backrest frame 20,
and a crossbar 22 mounted in the backrest frame 20 and secured on
the support frame 1.
[0026] The crossbar 22 of the back support 2 has two ends each
formed with a locking tube 26 adjustably mounted on the respective
support rod 11 of the support frame 1, so that the crossbar 22 of
the back support 2 is secured on the support rods 11 of the support
frame 1.
[0027] The back support 2 further includes a first cover 23 mounted
on the crossbar 22, a second cover 24 mounted on the crossbar 22
and combined with the first cover 23, and a substantially V-shaped
elastic bar 25 having a first end mounted between the first cover
23 and the second cover 24 and a second end pivotally mounted to
the waist support 3 by a pivot member 33 (see FIG. 5). The elastic
bar 25 has a corrugated face to enhance the elastic effect of the
elastic bar 25.
[0028] The first cover 23 is formed with two screw bores 232, the
first end of the elastic bar 25 is formed with two through holes
252, and the back support 2 further includes two locking screws 251
each extended through a respective one of the two through holes 252
of the elastic bar 25 and each screwed into a respective one of the
two screw bores 232 of the first cover 23, so that the elastic bar
25 is fixed on the first cover 23.
[0029] The first cover 23 is formed with two screw holes 231, the
crossbar 22 has a mediate portion formed with two through holes
222, and the back support 2 further includes two fixing screws 221
each extended through a respective one of the two through holes 222
of the crossbar 22 and each screwed into a respective one of the
two screw holes 231 of the first cover 23, so that the first cover
23 is fixed on the crossbar 22.
[0030] The first cover 23 has a periphery formed with four
positioning holes 233, and the second cover 24 has a periphery
formed with four positioning tenons 241 each inserted into a
respective one of the positioning holes 233 of the first cover 23,
so that the second cover 24 is combined with the first cover
23.
[0031] The head support 4 includes a substantially inverted
T-shaped support rack 46 having a lower end formed with two
mounting tubes 44 each mounted on the respective support rod 11 of
the support frame 1, a substantially inverted L-shaped support bar
43 adjustably mounted on the support rack 46 and having a lower end
mounted on an upper end of the support rack 46, a head frame 40
pivotally mounted on an upper end of the support bar 43 by a pivot
member 42, and a net 41 made of foam material or the like mounted
on the head frame 40.
[0032] The waist support 3 is pivotally mounted on the back support
2 by a pivot member 32 (see FIG. 4) and is provided with a net 31
made of foam material or the like.
[0033] In operation, referring to FIGS. 1-5, the locking tube 26 of
the crossbar 22 of the back support 2 is adjustably mounted on the
respective support rod 11 of the support frame 1, so that the back
support 2 is adjustably mounted on the support frame 1 to adjust
the height of the back support 2 so as to fit users of different
statures. In addition, the support bar 43 of the head support 4 is
adjustably mounted on the support rack 46, so that the head frame
40 is adjustably mounted on the support rack 46 to adjust the
height of the head support 4 so as to fit users of different
statures. Further, when a user is rested on the backrest assembly,
the back support 2 supports the user's back, and the waist support
3 supports the user's waist by the elastic effect of the elastic
bar 25 which provides a cushion force to the waist support 3 so as
to enhance the support effect of the waist support 3, so that the
user feels more comfortable. Further, the waist support 3 is
pivotable relative to the back support 2, so that the inclined
angle of the waist support 3 is adjustable so as to fit the user's
requirement. Further, the head frame 40 of the head support 4 is
pivotable relative to the support bar 43, so that the inclined
angle of the head frame 40 of the head support 4 is adjustable so
as to fit the user's requirement.
[0034] Although the invention has been explained in relation to its
preferred embodiment(s) as mentioned above, it is to be understood
that many other possible modifications and variations can be made
without departing from the scope of the present invention. It is,
therefore, contemplated that the appended claim or claims will
cover such modifications and variations that fall within the true
scope of the invention.
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