U.S. patent application number 10/015877 was filed with the patent office on 2003-06-12 for chair adjusting device.
Invention is credited to Wu, Wen-Long.
Application Number | 20030107251 10/015877 |
Document ID | / |
Family ID | 21774132 |
Filed Date | 2003-06-12 |
United States Patent
Application |
20030107251 |
Kind Code |
A1 |
Wu, Wen-Long |
June 12, 2003 |
Chair adjusting device
Abstract
A chair adjusting device includes a seat support board, a base,
a backrest linking base, two elastic sets, and a backrest. The two
elastic sets may provide an auxiliary elastic force to the backrest
linking base. The seat support board has a rear side slidably
mounted on the two side plates of the backrest linking base by two
pivot knobs, so that the seat support board may be moved in concert
with the backrest linking base. A primary urging spring is mounted
on the support rod, and has a top edge urged on a bottom face of
the seat support board.
Inventors: |
Wu, Wen-Long; (Taichung
City, TW) |
Correspondence
Address: |
Connolly Bove Lodge & Hutz LLP
P.O. Box 2207
Wilmington
DE
19899-2207
US
|
Family ID: |
21774132 |
Appl. No.: |
10/015877 |
Filed: |
December 12, 2001 |
Current U.S.
Class: |
297/300.4 ;
297/300.5 |
Current CPC
Class: |
A47C 1/03266 20130101;
A47C 1/03272 20130101; A47C 1/03255 20130101; A47C 1/03294
20130101; A47C 1/03274 20180801 |
Class at
Publication: |
297/300.4 ;
297/300.5 |
International
Class: |
A47C 001/032 |
Claims
What is claimed is:
1. A chair adjusting device, comprising: a seat support board, a
base, a backrest linking base, two elastic sets, and a backrest,
wherein: the seat support board has a front side provided with two
oblique support racks, the front side of the seat support board is
formed with a shaft hole, and a first shaft is extended through the
shaft hole, so that the front side of the seat support board is
pivotally mounted on the base, the seat support board has a rear
side slidably mounted on two side plates of the backrest linking
base by two pivot knobs, so that the seat support board may be
moved in concert with the backrest linking base; the base has two
side plates for passage of a second shaft, so that the backrest
linking base may be pivotally mounted on the two side plates of the
base by the second shaft, a support rod is screwed and positioned
between the two side plates of the base, a primary urging spring is
mounted on the support rod, and has a top edge urged on a bottom
face of the seat support board; the backrest linking base is
pivotally mounted on the base by the second shaft, and front ends
of the two side plates of the backrest linking base are
symmetrically pivoted with two elastic sets respectively; and each
of the two elastic sets includes two pivot bases, a slide rod, and
an auxiliary spring, a first one of the two pivot bases of each of
the two elastic sets is positioned between the two side plates of
the base by a third shaft, and a second one of the two pivot bases
of each of the two elastic sets is pivoted and positioned on the
front end of each of the two side plates of the backrest linking
base, so that the backrest linking base is constantly subjected to
an auxiliary elastic force by the two elastic sets.
2. The chair adjusting device in accordance with claim 1, wherein
the base is secured on a foot post.
3. The chair adjusting device in accordance with claim 1, further
comprising a hook rod extended through a bottom face of the base,
wherein the hook rod has a top end hooked on a side edge of the
primary urging spring, and a bottom end screwed into a locking
sleeve.
4. The chair adjusting device in accordance with claim 1, wherein
the backrest is L-shaped, and is threadedly secured on a rear side
of the backrest linking base.
5. The chair adjusting device in accordance with claim 1, wherein
the auxiliary spring is mounted on the slide rod which is slidably
pivoted between the two pivot bases.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a chair adjusting device,
and more particularly to a chair adjusting device that may entirely
satisfy the ergonomic requirements and may adjust the inclined
angle between the seat and the backrest automatically and
synchronously, such that the user may obtain comfortable
sensation.
[0003] 2. Description of the Related Art
[0004] A conventional chair comprises a seat and a backrest. When
the backrest is adjusted to have an inclined angle so as to fit the
user's requirement, the seat is also moved with the backrest to
have an inclined angle, so that the front side of the seat is
lifted synchronously. However, the inner side of the user's leg is
compressed by the inclined front side of the seat, thereby easily
causing uncomfortable sensation to the user during long-term
utilization, and thereby easily poorly affecting the blood
circulation of the user.
[0005] The closest prior art of which the applicant is aware is
disclosed in the Taiwanese Patent Publication No. 239946, entitled
by "Base Structure of Chair".
[0006] In the Taiwanese Patent Publication No. 239946, the two
springs function as the primary springs, and are the only source of
the elastic force. In addition, when the backrest is inclined
backward, the seat is not inclined backward with the backrest.
Further, the elastic force of the two primary springs cannot be
adjusted. Further, all of the elastic force of the two primary
springs is concentrated on the backrest linking base, thereby
easily producing a stress concentration point.
SUMMARY OF THE INVENTION
[0007] The primary objective of the present invention is to provide
a chair adjusting device that may entirely satisfy the ergonomic
requirements, and may adjust the inclined angle between the seat
and the backrest automatically and synchronously, so that the user
may have a comfortable sensation.
[0008] Another objective of the present invention is to provide a
chair adjusting device, wherein the elastic force of the primary
urging spring and the two auxiliary springs of the two elastic sets
may be evenly distributed on the seat support board, the backrest
linking base, and the L-shaped backrest, thereby preventing from
producing a stress concentration point.
[0009] In accordance with the present invention, there is provided
a chair adjusting device, comprising: a seat support board, a base,
a backrest linking base, two elastic sets, and a backrest,
wherein:
[0010] the seat support board has a front side provided with two
oblique support racks, the front side of the seat support board is
formed with a shaft hole, and a first shaft is extended through the
shaft hole, so that the front side of the seat support board is
pivotally mounted on the base, the seat support board has a rear
side slidably mounted on two side plates of the backrest linking
base by two pivot knobs, so that the seat support board may be
moved in concert with the backrest linking base;
[0011] the base has two side plates for passage of a second shaft,
so that the backrest linking base may be pivotally mounted on the
two side plates of the base by the second shaft, a support rod is
screwed and positioned between the two side plates of the base, a
primary urging spring is mounted on the support rod, and has a top
edge urged on a bottom face of the seat support board;
[0012] the backrest linking base is pivotally mounted on the base
by the second shaft, and front ends of the two side plates of the
backrest linking base are symmetrically pivoted with two elastic
sets respectively; and
[0013] each of the two elastic sets includes two pivot bases, a
slide rod, and an auxiliary spring, a first one of the two pivot
bases of each of the two elastic sets is positioned between the two
side plates of the base by a third shaft, and a second one of the
two pivot bases of each of the two elastic sets is pivoted and
positioned on the front end of each of the two side plates of the
backrest linking base, so that the backrest linking base is
constantly subjected to an auxiliary elastic force by the two
elastic sets.
[0014] 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
[0015] FIG. 1 is a perspective assembly view of a chair adjusting
device in accordance with a preferred embodiment of the present
invention;
[0016] FIG. 2 is an exploded perspective view of the chair
adjusting device as shown in FIG. 1;
[0017] FIG. 3 is a partially exploded perspective view of the chair
adjusting device as shown in FIG. 1;
[0018] FIG. 4 is a side plan cross-sectional view of the chair
adjusting device as shown in FIG. 1; and
[0019] FIG. 5 is a schematic operational view of the chair
adjusting device as shown in FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION
[0020] Referring to the drawings and initially to FIGS. 1-3, a
chair adjusting device in accordance with a preferred embodiment of
the present invention comprises a seat support board 10, a base 20,
a backrest linking base 30, two elastic sets 40, and a backrest
50.
[0021] The seat support board 10 has a front side provided with two
oblique support racks 11, so that a seat (not shown) may be
threadedly secured on the two support racks 11. The front side of
the seat support board 10 is formed with a shaft hole 15, and a
shaft 25 is extended through the shaft hole 15, whereby the front
side of the seat support board 10 is pivotally mounted on the base
20, so that the shaft 25 may function as the rotation shaft of the
seat support board 10.
[0022] The seat support board 10 has a rear side formed with two
opposite slide slots 16 for passage of two pivot knobs 36, whereby
the rear side of the seat support board 10 may be slidably mounted
on the two side plates of the backrest linking base 30 by the two
pivot knobs 36, so that the seat support board 10 may be moved in
concert with the backrest linking base 30.
[0023] The base 20 is secured on a foot post 28, and has two side
plates for passage of a shaft 26, so that the backrest linking base
30 may be pivotally mounted on the two side plates of the base
20.
[0024] A support rod 21 is screwed and positioned on the two side
plates of the base 20. A primary urging spring 22 is mounted on the
support rod 21, and has a top edge urged on a bottom face of the
seat support board 10.
[0025] A hook rod 23 is extended through a bottom face of the base
20, and has a top end hooked on a side edge of the primary urging
spring 22, and a bottom end screwed into a locking sleeve 29. The
locking sleeve 29 may be rotated to move the hook rod 23, thereby
adjusting the upward urging force of the primary urging spring 22,
so as to fit the requirements of different users.
[0026] The backrest linking base 30 is pivotally mounted on the two
side plates of the base 20 by the shaft 26, so that the shaft 26
may function as a rotation shaft of the backrest linking base
30.
[0027] An L-shaped backrest 50 is threadedly secured on a rear side
of the backrest linking base 30, and a backrest cushion (not shown)
may be mounted on the backrest 50.
[0028] The rear side of the seat support board 10 is slidably
mounted on the two side plates of the backrest linking base 30 by
the two pivot knobs 36, so that the seat support board 10 may be
moved in concert with the backrest linking base 30. The front ends
of the two side plates of the backrest linking base 30 are
symmetrically pivoted with two elastic sets 40 respectively.
[0029] Each of the two elastic sets 40 includes two pivot bases 41,
a slide rod 42, and an auxiliary spring 43. A first one of the two
pivot bases 41 of each of the two elastic sets 40 is positioned
between the two side plates of the base 20 by a shaft 24. The
auxiliary spring 43 is mounted on the slide rod 42 which is
slidably pivoted between the two pivot bases 41. A second one of
the two pivot bases 41 of each of the two elastic sets 40 is
pivoted and positioned on the front end of each of the two side
plates of the backrest linking base 30 by two shaft pins 39, so
that the backrest linking base 30 and the L-shaped backrest 50 are
constantly subjected to a clockwise auxiliary elastic force by the
two elastic sets 40 as shown in FIG. 4.
[0030] Referring to FIGS. 1-5, in the chair adjusting device in
accordance with a preferred embodiment of the present invention,
the two slightly inclined elastic sets 40 may provide an auxiliary
elastic force to the backrest linking base 30 and the L-shaped
backrest 50, and the rear side of the seat support board 10 is
slidably mounted on the two side plates of the backrest linking
base 30 by the two pivot knobs 36, so that the seat support board
10 may be moved in concert with the backrest linking base 30. The
primary urging spring 22 is urged on the bottom face of the seat
support board 10.
[0031] Thus, the elastic force of the primary urging spring 22 and
the two auxiliary springs 43 of the two elastic sets 40 may be
evenly distributed on the seat support board 10, the backrest
linking base 30, and the L-shaped backrest 50, thereby preventing
from producing a stress concentration point.
[0032] In addition, the elastic force of the primary urging spring
22 and the two auxiliary springs 43 may be applied on the seat
support board 10, the backrest linking base 30, and the L-shaped
backrest 50 synchronously.
[0033] Further, the locking sleeve 29 may be rotated to move the
hook rod 23, thereby adjusting the upward urging force of the
primary urging spring 22 on the seat support board 10.
[0034] Accordingly, the primary urging spring 22 and the two
auxiliary springs 43 of the two elastic sets 40 may apply an
auxiliary elastic force to the seat support board 10 and the
backrest linking base 30, so that the seat support board 10 and the
backrest linking base 30 may be rotated relative to the base 20
synchronously. Thus, the chair adjusting device of the present
invention may entirely satisfy the ergonomic requirements, and may
adjust the inclined angle between the seat and the backrest
automatically and synchronously, so that the user may have a
comfortable sensation.
[0035] In comparison, in the Taiwanese Patent Publication No.
239946, the two springs function as the primary springs, and are
the only source of the elastic force. In addition, when the
backrest is inclined backward, the seat is not inclined backward
with the backrest. Further, the elastic force of the two primary
springs cannot be adjusted. Further, all of the elastic force of
the two primary springs is concentrated on the backrest linking
base, thereby easily producing a stress concentration point.
[0036] In the present invention, the primary urging spring 22
functions as the primary spring, and the two auxiliary springs 43
of the two elastic sets 40 only provide an auxiliary elastic force.
In addition, when the backrest 50 is inclined backward, the seat
support board 10 and the backrest linking base 30 are also inclined
backward with the backrest 50. Further, the locking sleeve 29 may
be rotated to move the hook rod 23, thereby adjusting the upward
urging force of the primary urging spring 22, so as to fit the
requirements of different users. Further, the elastic force of the
primary urging spring 22 and the two auxiliary springs 43 of the
two elastic sets 40 may be evenly distributed on the seat support
board 10, the backrest linking base 30, and the L-shaped backrest
50, thereby preventing from producing a stress concentration
point.
[0037] Although the invention has been explained in relation to its
preferred embodiment 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.
* * * * *