U.S. patent application number 11/738966 was filed with the patent office on 2008-10-23 for chair having a seat whose position is adjustable.
Invention is credited to Wu-Chin Lu.
Application Number | 20080258531 11/738966 |
Document ID | / |
Family ID | 39871486 |
Filed Date | 2008-10-23 |
United States Patent
Application |
20080258531 |
Kind Code |
A1 |
Lu; Wu-Chin |
October 23, 2008 |
CHAIR HAVING A SEAT WHOSE POSITION IS ADJUSTABLE
Abstract
A chair includes a stand, a support base mounted on the stand, a
backrest mounted on the support base, a fixed bracket pivotally
mounted on the support base, a movable bracket movably mounted on
the fixed bracket, and a seat mounted on the movable bracket to
move with the movable bracket. Thus, when the movable bracket is
unlocked from the fixed bracket, the movable bracket is movable
relative to the fixed bracket so that the seat is movable relative
to the stand and the backrest to adjust the position of the seat
relative to the stand and the backrest according to a user's
requirement, thereby providing a comfortable sensation to the
user.
Inventors: |
Lu; Wu-Chin; (Tai Pao
Hsiang, TW) |
Correspondence
Address: |
KAMRATH & ASSOCIATES P.A.
4825 OLSON MEMORIAL HIGHWAY, SUITE 245
GOLDEN VALLEY
MN
55422
US
|
Family ID: |
39871486 |
Appl. No.: |
11/738966 |
Filed: |
April 23, 2007 |
Current U.S.
Class: |
297/337 |
Current CPC
Class: |
A47C 1/023 20130101 |
Class at
Publication: |
297/337 |
International
Class: |
A47C 1/023 20060101
A47C001/023; A47C 1/02 20060101 A47C001/02; A47C 1/00 20060101
A47C001/00 |
Claims
1. A chair comprising: a stand; a support base mounted on the
stand; a backrest mounted on the support base; a fixed bracket
pivotally mounted on the support base; a movable bracket movably
mounted on the fixed bracket; a seat mounted on the movable bracket
to move with the movable bracket.
2. The chair in accordance with claim 1, wherein: the fixed bracket
has two downward extending upright sidewalls each formed with an
elongated slideway and a plurality of locking grooves each
connected to the slideway; the chair further comprises a control
handle pivotally mounted on the movable bracket to move with the
movable bracket and having a first end formed with two positioning
portions each movable in the slideway of the fixed bracket and each
slidably inserted into and detachably locked in one of the locking
grooves of the fixed bracket to lock the movable bracket on the
fixed bracket temporarily.
3. The chair in accordance with claim 2, wherein the locking
grooves of the fixed bracket are equally spaced from each
other.
4. The chair in accordance with claim 2, wherein the locking
grooves of the fixed bracket are located above the slideway.
5. The chair in accordance with claim 2, wherein the each of the
sidewalls of the fixed bracket is pivotally mounted on the support
base by a bolt.
6. The chair in accordance with claim 2, wherein each of the
positioning portions of the control handle has a substantially
L-shaped profile.
7. The chair in accordance with claim 2, wherein the positioning
portions of the control handle are directed toward each other.
8. The chair in accordance with claim 2, wherein: the control
handle is pivotally mounted on the movable bracket by two pivot
brackets; the chair further comprises two torsion springs each
biased between the control handle and a respective pivot bracket to
pivot the control handle relative to the movable bracket and the
fixed bracket and to move each of the positioning portions of the
control handle toward one of the locking grooves of the fixed
bracket to lock the movable bracket on the fixed bracket at a
normal state.
9. The chair in accordance with claim 8, wherein the pivot brackets
are secured on a bottom of the movable bracket.
10. The chair in accordance with claim 8, wherein the control
handle has a second end formed with a holding portion.
11. The chair in accordance with claim 10, wherein a distance
between the holding portion of the control handle and each of the
pivot brackets is greater than that between each of the positioning
portions of the control handle and each of the pivot brackets to
facilitate a user pivoting the control handle.
12. The chair in accordance with claim 10, wherein when the holding
portion of the control handle is movable upward, the control handle
is pivotable relative to the movable bracket, and each of the
positioning portions of the control handle is movable downward to
detach from one of the locking grooves of the fixed bracket into
the slideway of the fixed bracket and is movable in the slideway of
the fixed bracket.
13. The chair in accordance with claim 2, wherein: the fixed
bracket has a top wall formed with a plurality of screw bores; the
movable bracket is formed with a plurality of guide slots each
aligning with a respective screw bore of the fixed bracket; the
chair further comprises a plurality of guide screws each extended
through a respective guide slot of the movable bracket and each
screwed into a respective screw bore of the fixed bracket.
14. The chair in accordance with claim 13, wherein the screw bores
of the fixed bracket is located between the sidewalls.
15. The chair in accordance with claim 13, wherein each of the
guide screws is movable in the respective guide slot of the movable
bracket when the movable bracket is movable relative to the fixed
bracket to guide movement of the movable bracket relative to the
fixed bracket.
16. The chair in accordance with claim 13, further comprising a
plurality of bushings located between a respective guide screw and
a respective guide slot of the movable bracket.
17. The chair in accordance with claim 1, wherein the fixed bracket
has a substantially inverted U-shaped cross-sectional profile.
18. The chair in accordance with claim 1, wherein the control
handle is located between the movable bracket and the fixed
bracket.
19. The chair in accordance with claim 1, wherein the control
handle has a substantially U-shaped cross-sectional profile.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a chair and, more
particularly, to a chair having a position adjustable function.
[0003] 2. Description of the Related Art
[0004] A conventional chair comprises a stand, a plurality of
support legs mounted on the lower end of the strand, a support base
mounted on the upper end of the stand, a backrest mounted on the
support base, and a seat mounted on the support base and
perpendicular to the backrest. However, the seat and the backrest
are fixed so that a user cannot adjust the position of the seat
relative to the backrest according to the practical requirement,
thereby easily causing an uncomfortable sensation to the user when
the size of the chair is not suitable for the user's stature.
BRIEF SUMMARY OF THE INVENTION
[0005] In accordance with the present invention, there is provided
a chair, comprising a stand, a support base mounted on the stand, a
backrest mounted on the support base, a fixed bracket pivotally
mounted on the support base, a movable bracket movably mounted on
the fixed bracket, and a seat mounted on the movable bracket to
move with the movable bracket.
[0006] The primary objective of the present invention is to provide
a chair having a seat whose horizontal position is adjustable.
[0007] Another objective of the present invention is to provide a
chair, wherein when the movable bracket is unlocked from the fixed
bracket, the movable bracket is movable relative to the fixed
bracket so that the seat is movable relative to the stand and the
backrest to adjust the position of the seat relative to the stand
and the backrest according to a user's requirement, thereby
providing a comfortable sensation to the user.
[0008] A further objective of the present invention is to provide a
chair, wherein the user only needs to pull the holding portion of
the control handle upward to adjust the position of the seat, so
that the position of the seat is adjusted easily and quickly,
thereby facilitating the user adjusting the position of the
seat.
[0009] A further objective of the present invention is to provide a
chair, wherein the seat is fixed after the force applied on the
holding portion of the control handle is removed, so that the user
only needs to release the holding portion of the control handle to
lock the seat automatically, thereby saving the user's energy.
[0010] 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 SEVERAL VIEWS OF THE DRAWING(S)
[0011] FIG. 1 is a side view of a chair in accordance with the
preferred embodiment of the present invention.
[0012] FIG. 2 is a perspective view of the chair in accordance with
the preferred embodiment of the present invention.
[0013] FIG. 3 is a partially exploded perspective view of the chair
as shown in FIG. 2.
[0014] FIG. 4 is a schematic operational view of the chair as shown
in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
[0015] Referring to the drawings and initially to FIGS. 1-3, a
chair 1 in accordance with the preferred embodiment of the present
invention comprises a stand 12, a support base 40 mounted on the
stand 12, a backrest 11 mounted on the support base 40, a fixed
bracket 30 pivotally mounted on the support base 40, a movable
bracket 20 movably mounted on the fixed bracket 30, and a seat 10
mounted on the movable bracket 20 to move with the movable bracket
20.
[0016] The fixed bracket 30 has a substantially inverted U-shaped
cross-sectional profile. The fixed bracket 30 has two downward
extending upright sidewalls 35 each formed with an elongated
slideway 34 and a plurality of locking grooves 33 each connected to
the slideway 34. The locking grooves 33 of the fixed bracket 30 are
equally spaced from each other and are located above the slideway
34. Each of the sidewalls 35 of the fixed bracket 30 is pivotally
mounted on the support base 40 by a bolt 32. The fixed bracket 30
has a top wall formed with a plurality of screw bores 31 located
between the sidewalls 35.
[0017] The chair 1 further comprises a control handle 28 pivotally
mounted on the movable bracket 20 to move with the movable bracket
20 and located between the movable bracket 20 and the fixed bracket
30. The control handle 28 has a substantially U-shaped
cross-sectional profile.
[0018] The control handle 28 has a first end formed with two
positioning portions 26 each movable in the slideway 34 of the
fixed bracket 30 and each slidably inserted into and detachably
locked in one of the locking grooves 33 of the fixed bracket 30 to
lock the movable bracket 20 on the fixed bracket 30 temporarily.
Each of the positioning portions 26 of the control handle 28 has a
substantially L-shaped profile, and the positioning portions 26 of
the control handle 28 are directed toward each other.
[0019] The control handle 28 is pivotally mounted on the movable
bracket 20 by two pivot brackets 23 which are secured on a bottom
of the movable bracket 20, and the chair 1 further comprises two
torsion springs 24 each biased between the control handle 28 and a
respective pivot bracket 23 to pivot the control handle 28 relative
to the movable bracket 20 and the fixed bracket 30 and to move each
of the positioning portions 26 of the control handle 28 toward one
of the locking grooves 33 of the fixed bracket 30 to lock the
movable bracket 20 on the fixed bracket 30 at a normal state.
[0020] The control handle 28 has a second end formed with a holding
portion 25, wherein a distance between the holding portion 25 of
the control handle 28 and each of the pivot brackets 23 is greater
than that between each of the positioning portions 26 of the
control handle 28 and each of the pivot brackets 23 to facilitate a
user pivoting the control handle 28. Thus, when the holding portion
25 of the control handle 28 is movable upward, the control handle
28 is pivotable relative to the movable bracket 20, and each of the
positioning portions 26 of the control handle 28 is movable
downward to detach from one of the locking grooves 33 of the fixed
bracket 30 into the slideway 34 of the fixed bracket 30 and is
movable in the slideway 34 of the fixed bracket 30.
[0021] The movable bracket 20 is formed with a plurality of guide
slots 21 each aligning with a respective screw bore 31 of the fixed
bracket 30, and the chair 1 further comprises a plurality of guide
screws 27 each extended through a respective guide slot 21 of the
movable bracket 20 and each screwed into a respective screw bore 31
of the fixed bracket 30, and a plurality of bushings 22 located
between a respective guide screw 27 and a respective guide slot 21
of the movable bracket 20. Thus, each of the guide screws 27 is
movable in the respective guide slot 21 of the movable bracket 20
when the movable bracket 20 is movable relative to the fixed
bracket 30 to guide movement of the movable bracket 20 relative to
the fixed bracket 30.
[0022] As shown in FIGS. 1-3, each of the positioning portions 26
of the control handle 28 is forced to move upward by an elastic
force of the torsion springs 24 so that each of the positioning
portions 26 of the control handle 28 is locked in one of the
locking grooves 33 of the fixed bracket 30 to lock the movable
bracket 20 on the fixed bracket 30 at a normal state. Thus, the
movable bracket 20 is locked on the fixed bracket 30 so that the
seat 10 is fixed on the stand 12 and the backrest 11 and cannot be
moved relative to the stand 12 and the backrest 11.
[0023] In adjustment, referring to FIG. 4 with reference to FIGS.
1-3, when the holding portion 25 of the control handle 28 is
movable upward, the control handle 28 is pivotable relative to the
movable bracket 20, and each of the positioning portions 26 of the
control handle 28 is movable downward to detach from one of the
locking grooves 33 of the fixed bracket 30 into the slideway 34 of
the fixed bracket 30 and is movable in the slideway 34 of the fixed
bracket 30. In such a manner, the movable bracket 20 is unlocked
from and movable relative to the fixed bracket 30 so that the seat
10 is movable relative to the stand 12 and the backrest 11 to
adjust the position of the seat 10 relative to the stand 12 and the
backrest 11. At this time, each of the guide screws 27 is movable
in the respective guide slot 21 of the movable bracket 20 when the
movable bracket 20 is movable relative to the fixed bracket 30 to
guide movement of the movable bracket 20 relative to the fixed
bracket 30.
[0024] After the force applied on the holding portion 25 of the
control handle 28 is removed, each of the positioning portions 26
of the control handle 28 is forced to move upward by the restoring
force of the torsion springs 24 so that each of the positioning
portions 26 of the control handle 28 is locked in another one of
the locking grooves 33 of the fixed bracket 30 to lock the movable
bracket 20 on the fixed bracket 30 at a normal state. Thus, the
movable bracket 20 is locked on the fixed bracket 30 so that the
seat 10 is fixed and cannot be moved relative to the stand 12 and
the backrest 11.
[0025] Accordingly, when the movable bracket 20 is unlocked from
the fixed bracket 30, the movable bracket 20 is movable relative to
the fixed bracket 30 so that the seat 10 is movable relative to the
stand 12 and the backrest 11 to adjust the position of the seat 10
relative to the stand 12 and the backrest 11 according to a user's
requirement, thereby providing a comfortable sensation to the user.
In addition, the user only needs to pull the holding portion 25 of
the control handle 28 upward to adjust the position of the seat 10,
so that the position of the seat 10 is adjusted easily and quickly,
thereby facilitating the user adjusting the position of the seat
10. Further, the seat 10 is fixed after the force applied on the
holding portion 25 of the control handle 28 is removed, so that the
user only needs to release the holding portion 25 of the control
handle 28 to lock the seat 10 automatically, thereby saving the
user's energy.
[0026] 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.
* * * * *