U.S. patent application number 16/316522 was filed with the patent office on 2020-01-30 for foldable height-adjustable desk workstation.
The applicant listed for this patent is Jiaxing Haihong Mechanical and Electrical Technology Co., Ltd.. Invention is credited to Pengfei DU, Yungen LI.
Application Number | 20200029685 16/316522 |
Document ID | / |
Family ID | 62903593 |
Filed Date | 2020-01-30 |
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United States Patent
Application |
20200029685 |
Kind Code |
A1 |
DU; Pengfei ; et
al. |
January 30, 2020 |
FOLDABLE HEIGHT-ADJUSTABLE DESK WORKSTATION
Abstract
The present invention relates to an office appliance, and
particularly discloses a foldable height-adjustable desk
workstation, which comprises a workstation desktop, upper
workstation support legs, lower workstation support legs, lifters,
and locking mechanisms. In the foldable height-adjustable desk
workstation with the above-mentioned structure, the workstation
desktop can be controlled by the lifters arranged between the upper
workstation support legs and the lower workstation support legs to
vertically go up or down, and the workstation desktop can be locked
at any height position between an upper limit position and a lower
limit position by the locking mechanisms. A synchronous link
mechanism is arranged between locking bars of the two sets of
locking mechanisms, the two sets of locking mechanisms can be
synchronously unlocked by a spanner connected to any one of the
locking bars, single-hand operation can ensure the balanced raising
and lowering of the workstation desktop, so that the other hand can
synchronously conduct other actions such as applying raising or
lowering pressure on the workstation desktop, and thereby the
convenience and experience of operating the workstation desktop are
improved.
Inventors: |
DU; Pengfei; (Zhejiang,
CN) ; LI; Yungen; (Zhejiang, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Jiaxing Haihong Mechanical and Electrical Technology Co.,
Ltd. |
Zhejiang |
|
CN |
|
|
Family ID: |
62903593 |
Appl. No.: |
16/316522 |
Filed: |
November 17, 2017 |
PCT Filed: |
November 17, 2017 |
PCT NO: |
PCT/CN2017/111509 |
371 Date: |
January 9, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A47B 21/02 20130101;
A47B 9/02 20130101; A47B 21/0314 20130101; A47B 2021/0321 20130101;
A47B 61/02 20130101; A47B 9/16 20130101 |
International
Class: |
A47B 21/02 20060101
A47B021/02; A47B 21/03 20060101 A47B021/03; A47B 9/16 20060101
A47B009/16 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 31, 2017 |
CN |
201721108164.1 |
Claims
1-11. (canceled)
12. A foldable height-adjustable desk workstation, comprising: a
workstation desktop; upper workstation support legs, the pair of
upper workstation support legs are arranged in parallel on both
sides of the lower surface of the workstation desktop; lower
workstation support legs, the pair of lower workstation support
legs are respectively arranged under the pair of upper workstation
support legs; and lifters, the pair of lifters are respectively
arranged between the upper workstation support leg and lower
workstation support leg of the same side, each lifter at least
comprises a first slider, and the interior of each upper
workstation support leg is provided with a first slide cavity
matching the first slider along the length direction; characterized
by further comprising locking mechanisms, each locking mechanism
comprises a locking bar arranged in the first slide cavity, both
ends of the locking bars are respectively articulated with both
ends of the upper workstation support legs, and lockup mechanisms
are arranged between the locking bars and the first sliders; a
synchronous link mechanism is arranged between the locking bars in
the first slide cavities of the pair of upper workstation support
legs, and a spanner is connected to the locking bar at one
side.
13. The foldable height-adjustable desk workstation of claim 12,
wherein each lifter further comprises a main support rod and an
auxiliary support rod, and the main support rod and the auxiliary
support rod are arranged crosswise and articulated with each other
at the junction; the upper ends of the main support rods are
articulated with the first sliders, and the lower ends of the main
support rods are articulated with the lower workstation support
legs; the interior of each lower workstation support leg is
provided with a second slide cavity, a second slider is arranged in
the second slide cavity, and the sliding direction of the second
sliders in the second slide cavities are parallel to the sliding
direction of the first sliders in the first slide cavities; the
upper ends of the auxiliary support rods are articulated with the
upper workstation support legs, and the lower ends of the auxiliary
support rods are articulated with the second sliders.
14. The foldable height-adjustable desk workstation of claim 13,
wherein first springs are arranged in the first slide cavities, and
each first spring is located between the first slider and one end
of the first slide cavity; second springs are arranged in the
second slide cavities, and each second spring is located between
the second slider and one end of the second slide cavity.
15. The foldable height-adjustable desk workstation of claim 14,
wherein the first springs and/or the second springs are
variable-pitch springs.
16. The foldable height-adjustable desk workstation of claim 15,
wherein the elastic coefficient of the ends, close to the first
sliders and/or the second sliders, of the variable-pitch springs is
less than the elastic coefficient of the ends far from the first
sliders and/or the second sliders.
17. The foldable height-adjustable desk workstation of claim 12,
wherein each lockup mechanism comprises a plurality of fastening
notches or fastening teeth arranged on the locking bar along the
length direction of the locking bar and a lockup portion arranged
on the first slider and matching the fastening notches or fastening
teeth, and an avoiding area is arranged at a position close to the
lockup portion.
18. The foldable height-adjustable desk workstation of claim 15,
wherein each lockup mechanism comprises a plurality of fastening
notches or fastening teeth arranged on the locking bar along the
length direction of the locking bar and a lockup portion arranged
on the first slider and matching the fastening notches or fastening
teeth, and an avoiding area is arranged at a position close to the
lockup portion.
19. The foldable height-adjustable desk workstation of claim 12,
wherein the synchronous link mechanism comprises a pair of first
links respectively connected to the locking bars and a pair of
second links for being connected to the pair of links, one end of
each first link is fixedly connected to the locking bar, and both
ends of the second links are respectively articulated with the
ends, far from the locking bars, of the pair of first links.
20. The foldable height-adjustable desk workstation of claim 17,
wherein the synchronous link mechanism comprises a pair of first
links respectively connected to the locking bars and a pair of
second links for being connected to the pair of links, one end of
each first link is fixedly connected to the locking bar, and both
ends of the second links are respectively articulated with the
ends, far from the locking bars, of the pair of first links.
21. The foldable height-adjustable desk workstation of claim 18,
wherein the synchronous link mechanism comprises a pair of first
links respectively connected to the locking bars and a pair of
second links for being connected to the pair of links, one end of
each first link is fixedly connected to the locking bar, and both
ends of the second links are respectively articulated with the
ends, far from the locking bars, of the pair of first links.
22. The foldable height-adjustable desk workstation of claim 12,
wherein elastic mechanisms are arranged on the locking bars or
between the locking bars and the upper workstation support
legs.
23. The foldable height-adjustable desk workstation of claim 17,
wherein elastic mechanisms are arranged on the locking bars or
between the locking bars and the upper workstation support
legs.
24. The foldable height-adjustable desk workstation of claim 10,
wherein elastic mechanisms are arranged on the locking bars or
between the locking bars and the upper workstation support
legs.
25. The foldable height-adjustable desk workstation of claim 23,
wherein the elastic mechanisms are torsional springs arranged on
the locking bars, and both ends of the torsional springs are
fixed.
26. The foldable height-adjustable desk workstation of claim 24,
wherein the elastic mechanisms are torsional springs arranged on
the locking bars, and both ends of the torsional springs are
fixed.
27. The foldable height-adjustable desk workstation of claim 12,
wherein a keyboard tray is arranged under the workstation desktop,
and brackets are arranged between the keyboard tray and the
workstation desktop.
28. The foldable height-adjustable desk workstation of claim 25,
wherein a keyboard tray is arranged under the workstation desktop,
and brackets are arranged between the keyboard tray and the
workstation desktop.
29. The foldable height-adjustable desk workstation of claim 26,
wherein a keyboard tray is arranged under the workstation desktop,
and brackets are arranged between the keyboard tray and the
workstation desktop.
30. The foldable height-adjustable desk workstation of claim 21,
wherein the keyboard tray is slidably connected to the brackets,
and the sliding direction is parallel to the sliding direction of
the first sliders.
31. The foldable height-adjustable desk workstation of claim 29,
wherein the keyboard tray is slidably connected to the brackets,
and the sliding direction is parallel to the sliding direction of
the first sliders.
Description
TECHNICAL FIELD
[0001] The present invention relates to an office appliance, and in
particular to a foldable height-adjustable desk workstation.
BACKGROUND ART
[0002] CN106805472A discloses a foldable height-adjustable desk
workstation. In the foldable height-adjustable desk workstation,
two spanners are respectively arranged on the left side and right
side of a workstation desktop, configured to drive fastening bars
to release the locking of main sliding ends. When the workstation
desktop needs to go up or down, left and right hands are required
to respectively control the corresponding spanners and
simultaneously turn the spanners to release the main sliding ends
locked by the fastening bars, so that the raising or lowering
operation of the workstation desktop can be carried out. The defect
of the structure is that only when the left and right hands
simultaneously turn the spanners can raising or lowering be carried
out, and because raising or lowering pressure also has to be
applied besides locking release in the process of raising or
lowering the workstation desktop, for a user with short stature,
short arm span and little strength, it is difficult to apply
pressure as both hands are used for turning the spanners. In
addition, the probability that unlocking is not synchronous on both
sides also exists in the foldable height-adjustable desk
workstation with the structure, and if unlocking is not synchronous
while raising or lowering pressure is applied, the phenomenon that
the workstation desktop is stuck will occur.
SUMMARY OF THE INVENTION
[0003] The technical problem to be solved by the present invention
is to solve the technical defect of the foldable height-adjustable
desk workstation in the prior art CN106805472A requiring the
spanners of both sides to simultaneously unlock the main sliding
ends.
[0004] In order to solve the above-mentioned technical problem, the
technical solution provided by the present invention is as follows:
a foldable height-adjustable desk workstation comprises:
a workstation desktop; upper workstation support legs, the pair of
upper workstation support legs are arranged in parallel on both
sides of the lower surface of the workstation desktop; lower
workstation support legs, the pair of lower workstation support
legs are respectively arranged under the pair of upper workstation
support legs; and lifters, the pair of lifters are respectively
arranged between the upper workstation support leg and lower
workstation support leg of the same side, each lifter at least
comprises a first slider, and the interior of each upper
workstation support leg is provided with a first slide cavity
matching the first slider along the length direction; the foldable
height-adjustable desk workstation further comprises locking
mechanisms, each locking mechanism comprises a locking bar arranged
in the first slide cavity, both ends of the locking bars are
respectively articulated with both ends of the upper workstation
support legs, and lockup mechanisms are arranged between the
locking bars and the first sliders; a synchronous link mechanism is
arranged between the locking bars in the first slide cavities of
the pair of upper workstation support legs, and a spanner is
connected to the locking bar at one side.
[0005] In the foldable height-adjustable desk workstation with the
above-mentioned structure, the workstation desktop can be
controlled by the lifters arranged between the upper workstation
support legs and the lower workstation support legs to vertically
go up or down, and the workstation desktop can be locked at any
height position between an upper limit position and a lower limit
position by the locking mechanisms. A synchronous link mechanism is
arranged between locking bars of the two sets of locking
mechanisms, the two sets of locking mechanisms can be synchronously
unlocked by a spanner connected to any one of the locking bars,
single-hand operation can ensure the balanced raising and lowering
of the workstation desktop, so that the other hand can
synchronously conduct other actions such as applying raising or
lowering pressure on the workstation desktop, and thereby the
convenience and experience of operating the workstation desktop are
improved.
[0006] In a preferred embodiment, each lifter further comprises a
main support rod and an auxiliary support rod, and the main support
rod and the auxiliary support rod are arranged crosswise and
articulated with each other at the junction; the upper ends of the
main support rods are articulated with the first sliders, and the
lower ends of the main support rods are articulated with the lower
workstation support legs; the interior of each lower workstation
support leg is provided with a second slide cavity, a second slider
is arranged in the second slide cavity, and the sliding direction
of the second sliders in the second slide cavities are parallel to
the sliding direction of the first sliders in the first slide
cavities, the upper ends of the auxiliary support rods are
articulated with the upper workstation support legs, and the lower
ends of the auxiliary support rods are articulated with the second
sliders. By means of the crossed arrangement of the main support
rod and the auxiliary support rod and the mode that one end is
articulated and the other end is slidably connected, the lifter
with the structure realizes the vertical raising and lowering of
the workstation desktop.
[0007] In a preferred embodiment, first springs are arranged in the
first slide cavities, and each first spring is located between the
first slider and one end of the first slide cavity; second springs
are arranged in the second slide cavities, and each second spring
is located between the second slider and one end of the second
slide cavity.
[0008] In a preferred embodiment, the first springs and/or the
second springs are variable-pitch springs.
[0009] In a preferred embodiment, the elastic coefficient of the
ends, close to the first sliders and/or the second sliders, of the
variable-pitch springs is less than the elastic coefficient of the
ends far from the first sliders and/or the second sliders.
[0010] In a preferred embodiment, the synchronous link mechanism
comprises a pair of first links respectively connected to the
locking bars and a pair of second links for being connected to the
pair of links, one end of each first link is fixedly connected to
the locking bar, and both ends of the second links are respectively
articulated with the ends, far from the locking bars, of the pair
of first links. The synchronous link mechanism with the structure
has the characteristics of simple structure and good
synchronicity.
[0011] In a preferred embodiment, each lockup mechanism comprises a
plurality of fastening notches or fastening teeth arranged on the
locking bar along the length direction of the locking bar and a
lockup portion arranged on the first slider and matching the
fastening notches or fastening teeth, and an avoiding area is
arranged at a position close to the lockup portion. After the
spanner controls the fastening teeth or fastening notches on the
locking bars to rotate to the avoiding areas, the locking bars
release the locking of the first sliders.
[0012] In a preferred embodiment, each lockup mechanism comprises a
plurality of fastening notches or fastening teeth arranged on the
locking bar along the length direction of the locking bar and a
lockup portion arranged on the first slider and matching the
fastening notches or fastening teeth, and an avoiding area is
arranged at a position close to the lockup portion.
[0013] In a preferred embodiment, elastic mechanisms are arranged
on the locking bars or between the locking bars and the upper
workstation support legs. The elastic mechanisms are configured to
make the fastening notches or fastening teeth on the locking bars
be in matched connection with the lockup portions on the first
sliders by means of elastic force under the natural state of the
released spanner, so that the workstation desktop is kept at a
corresponding height position.
[0014] In a preferred embodiment, the elastic mechanisms are
torsional springs arranged on the locking bars, and both ends of
the torsional springs are fixed. The torsional spring has the
technical advantages of simple structure, low cost and good
stability of rotary torque provided for the locking bar.
[0015] In a preferred embodiment, a keyboard tray is arranged under
the workstation desktop, and brackets are arranged between the
keyboard tray and the workstation desktop.
[0016] In a preferred embodiment, the keyboard tray is slidably
connected to the brackets, and the sliding direction is parallel to
the sliding direction of the first sliders. The drawing type
keyboard tray is more convenient to use, meeting the individualized
requirement of users.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is a three-dimensional structural schematic diagram
of a foldable height-adjustable desk workstation of the present
embodiment;
[0018] FIG. 2 is a three-dimensional structural schematic diagram
of the foldable height-adjustable desk workstation shown in FIG. 1
after a workstation desktop is hidden;
[0019] FIG. 3 is a partially enlarged schematic diagram of the
portion A shown in FIG. 2;
[0020] FIG. 4 is a three-dimensional structural schematic diagram
of the state of connection between a locking bar and a first slider
in the foldable height-adjustable desk workstation of the present
embodiment;
[0021] FIG. 5 is a partial structural schematic diagram of the
locking state of the locking bar and the first slider in the
present embodiment;
[0022] FIG. 6 is a partial structural schematic diagram of the
unlocking state of the locking bar and the first slider in the
present embodiment;
[0023] FIG. 7 is a partial structural schematic diagram of the
first slider in the present embodiment;
[0024] FIG. 8 is a side view of the foldable height-adjustable desk
workstation of the present embodiment, wherein a first slide cavity
is in a cutaway state;
[0025] FIG. 9 is an internal structural schematic diagram of a
lower workstation support leg in the present embodiment;
[0026] FIG. 10 is a structural schematic diagram of a first spring
in the present embodiment, wherein the first spring is a
variable-pitch spring;
[0027] FIG. 11 is a side view of the foldable height-adjustable
desk workstation of the present embodiment in which a keyboard tray
is in a state of being drawn out; and
[0028] FIG. 12 is a side view of the foldable height-adjustable
desk workstation of the present embodiment in which the keyboard
tray is in a state of being retracted.
DETAILED DESCRIPTION OF THE INVENTION
[0029] In order to make the objective, technical solution and
advantages of the present invention clearer, the present invention
is further described in details below in reference to drawings and
embodiments. It should be understood that the specific embodiments
described herein are only used to explain the present invention
rather than to limit the present invention.
[0030] As shown in FIG. 1 and FIG. 2, a foldable height-adjustable
desk workstation of the present embodiment comprises a workstation
desktop 10, a keyboard tray 20, a pair of upper workstation support
legs 30, a pair of lower workstation support legs 40, and lifters
50 arranged between the upper workstation support leg 30 and lower
workstation support leg 40 of the same side.
[0031] In the above-mentioned foldable height-adjustable desk
workstation, the keyboard tray 20 is connected under the
workstation desktop 10 through brackets 21. In a preferred
implementation mode, as shown in FIG. 11 and FIG. 12, the keyboard
tray 20 is slidably connected to the brackets 21, so that drawing
operation can be performed on the keyboard tray 20, and the drawing
type keyboard tray is more convenient to use, meeting the
individualized requirement of users. It should be pointed out that
the sliding mechanism in a drawer or a keyboard tray in the prior
art can be adopted as a sliding mechanism between the keyboard tray
20 and the brackets 21, and the specific structure is not specially
limited herein.
[0032] In the foldable height-adjustable desk workstation of the
present embodiment, the pair of upper workstation support legs 30
are arranged in parallel to each other on both sides of the lower
surface of the workstation desktop 10, and the pair of lower
workstation support legs 40 are respectively arranged under the
pair of upper workstation support legs 30. In a preferred
implementation mode, each lifter 50 arranged between the upper
workstation support leg 30 and the lower workstation support leg 40
comprises a main support rod 51 and an auxiliary support rod 52,
and as shown in FIG. 1, the main support rod and the auxiliary
support rod are arranged crosswise and articulated with each other
at the junction.
[0033] In the present embodiment, the upper ends of the main
support rods 51 are articulated with first sliders 53, and the
lower ends are articulated with the lower workstation support legs
40. The interiors of the upper workstation support legs 30 are
provided with first slide cavities 31 which extend along the length
direction and match the first sliders 53. The upper ends of the
auxiliary support rods 52 are articulated with the upper
workstation support legs 30, the lower ends are slidably connected
to the lower workstation support legs 40, and the sliding direction
is parallel to the sliding direction of the first sliders. In a
preferred implementation mode of the present embodiment, as shown
in FIG. 9, the interiors of the lower workstation support legs 40
are provided with second slide cavities 41, and second sliders 42
are arranged in the second slide cavities 41, wherein the sliding
direction of the sliders 42 in the second slide cavities 41 is
parallel to the sliding direction of the first sliders 53 in the
first slide cavities 31.
[0034] Further, the present embodiment further comprises locking
mechanisms, each locking mechanism comprises a locking bar 61
arranged in the first slide cavity 31, as shown in FIG. 2, and both
ends of the locking bar 61 are respectively articulated with both
ends of the upper workstation support leg 30. Elastic mechanisms
are arranged on the locking bars 61 or between the locking bars 61
and the upper workstation support legs 30, and the elastic
mechanisms can provide torsional elastic force for driving the
locking bars to rotate. Preferably, as shown in FIG. 4, the elastic
mechanisms in the present embodiment are torsional springs 65
arranged on the locking bars, and both ends of the torsional
springs 65 are fixed. The torsional spring has the technical
advantages of simple structure, low cost and good stability of
rotary torque provided for the locking bar.
[0035] Further, lockup mechanisms are arranged between the locking
bars 61 and the first sliders 53, and each lockup mechanism
comprises a plurality of fastening notches or fastening teeth
arranged on the locking bar along the length direction of the
locking bar 61 and a lockup portion arranged on the first slider 53
and matching the fastening notches or fastening teeth. Preferably,
as shown in FIGS. 4-7, in the present embodiment, the lockup
mechanisms are a plurality of fastening notches 66 arranged on the
locking bars 61, the first sliders 53 are provided with the lockup
portions 541 in matched connection with the fastening notches 66,
and avoiding areas 542 are arranged at positions close to the
lockup portions 541. As shown in FIG. 5, under a normal state,
under the action of elastic force, the fastening notches 66 and the
lockup portions 541 are in a connected state, and the workstation
desktop 10 is fixed at any height position. When the workstation
desktop 10 needs to be adjusted, as shown in FIG. 6, a spanner 62
connected to the locking bar 61 can be utilized to rotate the
locking bars until the fastening notches 66 are separated from the
lockup portions 541 and the locking bars 61 are located in the
avoiding areas 542, at this moment, unlocking is done, and the
workstation desktop 10 can freely go up or down.
[0036] In a preferred implementation mode, as shown in FIG. 2 and
FIG. 3, a synchronous link mechanism is arranged between the
locking bars of the two sets of locking mechanisms, the synchronous
link mechanism comprises a pair of first links 64 respectively
connected to the locking bars 61 and second links 63 for being
connected to the pair of first links 64, wherein one end of each
first link 64 is fixedly connected to the locking bar 61, and both
ends of the second links 63 are respectively articulated with the
ends, far from the locking bars 61, of the pair of first links 64.
Based on the above-mentioned synchronous link mechanism, the
locking bars of the two sets of locking mechanisms can carry out
synchronous rotational motion, and by rotating any one of the
locking bars, the other locking bar can be driven to synchronously
rotate. Therefore, in the present embodiment, as long as a spanner
is connected to the locking bar of any one of the sides, the
synchronous unlocking of the locking mechanisms on both sides can
be carried out by singe-operation, single-hand operation can ensure
the balanced raising and lowering of the workstation desktop, so
that the other hand can synchronously conduct other actions such as
applying raising or lowering pressure on the workstation desktop,
and thereby the convenience and experience of operating the
workstation desktop are improved.
[0037] Further, as shown in FIG. 8 and FIG. 9, in the present
embodiment, first springs 70 are arranged in the first slide
cavities 31, and each first spring 70 is located between the first
slider 53 and one end of the first slide cavity 31. Second springs
80 are arranged in the second slide cavities 41, and each second
spring 80 is located between the second slider 42 and one end of
the second slide cavity 41. It should be pointed out that the first
springs and the second springs can be arranged as not only
compressed springs but also extended springs. When the workstation
desktop is at the lowest position, the first springs and the second
springs are in an energy-storing state. After the locking of the
locking mechanisms is released by acting on the spanner 62, elastic
potential energy stored by the first spring and the second spring
is released, the released elastic potential energy drives the first
sliders and the second sliders to slide, so that the workstation
desktop is driven to rise, and therefore, in the raising process of
the workstation desktop, a user does not need to apply external
force or only needs to apply little external force.
[0038] In a preferred embodiment, as shown in FIG. 10,
variable-pitch springs are at least adopted as the first springs
70, each variable-pitch spring consists of a first spring section
71 and a second spring section 72, wherein the elastic coefficient
of the first spring section 71 far from the first slider is greater
than the elastic coefficient of the second spring section 72 close
to the first slider. The purpose of such an arrangement is that in
the lowering process of the workstation desktop, during initial
lowering, because the workstation desktop is high, the user cannot
conveniently apply force, the workstation desktop can be driven by
little pressure to go down, and at the initial lowering stage, the
second spring sections 72 with the less elastic coefficient are
compressed. After the workstation desktop goes down for a certain
height, as the height is reduced, the user can more conveniently
apply pressure, and at this moment, the first spring sections 71
with the greater elastic coefficient start to be compressed. When
the workstation desktop is raised at the beginning, resistance is
great, the elastic potential energy released by the variable-pitch
springs can overcome the great resistance at the initial stage of
raising, realizing raising without manual assistance; at the middle
and late stages of raising, the elastic force provided by the
variable-pitch springs decreases, and in the meantime, because of
the decrease of raising resistance, the workstation desktop can
still keep relatively stable raising speed without causing rapid
raising. By arranging the variable-pitch springs, the experience of
the user is made better, and ergonomics is better met.
[0039] It should be pointed out that in the present embodiment, not
only variable-pitch springs but also equal-pitch springs can be
used as the second springs 80.
[0040] In a word, what is described above is merely the preferred
embodiment of the present invention, and is not used to limit the
present invention, and any modifications, equivalent replacement,
improvements and the like which are made within the spirit and
principle of the present invention shall fall within the protection
scope of the present invention.
* * * * *