U.S. patent application number 14/034573 was filed with the patent office on 2014-10-16 for shaping apparatus and shaping method for chassis.
This patent application is currently assigned to Wistron Corporation. The applicant listed for this patent is Wistron Corporation. Invention is credited to Ta-Wei Chen, Shih-Lung Lin.
Application Number | 20140304991 14/034573 |
Document ID | / |
Family ID | 51665531 |
Filed Date | 2014-10-16 |
United States Patent
Application |
20140304991 |
Kind Code |
A1 |
Lin; Shih-Lung ; et
al. |
October 16, 2014 |
SHAPING APPARATUS AND SHAPING METHOD FOR CHASSIS
Abstract
A shaping apparatus of the invention is used for shaping a
chassis and includes a machine body, a first die, a second die and
a plurality of shaping members. The first die is disposed at a side
of the machine body and the chassis is suitable to be placed and
positioned at the first die. The second die is disposed at another
side of the machine body. The machine body drives the second die to
move relatively to the first die so that the second die moves close
to or far away from the first die. The shaping members are
detachably assembled to at least one of the first die and the
second die so that when the first die and the second die approach
each other, the shaping members press and deform the chassis
thereon. A shaping method for a chassis is also disclosed.
Inventors: |
Lin; Shih-Lung; (New Taipei
City, TW) ; Chen; Ta-Wei; (New Taipei City,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Wistron Corporation |
New Taipei City |
|
TW |
|
|
Assignee: |
Wistron Corporation
New Taipei City
TW
|
Family ID: |
51665531 |
Appl. No.: |
14/034573 |
Filed: |
September 24, 2013 |
Current U.S.
Class: |
29/897.3 ;
72/343 |
Current CPC
Class: |
B21D 22/02 20130101;
H05K 7/1485 20130101; B21D 37/02 20130101; Y10T 29/49623 20150115;
B21D 22/10 20130101 |
Class at
Publication: |
29/897.3 ;
72/343 |
International
Class: |
B21D 22/02 20060101
B21D022/02 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 11, 2013 |
TW |
102112881 |
Claims
1. A shaping apparatus, used for shaping a chassis and comprising:
a machine body; a first die, disposed at a side of the machine
body, wherein the chassis is suitable to be placed and positioned
at the first die; a second die, disposed at another side of the
machine body, wherein the machine body is able to drive the second
die to move relatively to the first die so that the second die
moves close to or far away from the first die; and a plurality of
shaping members, detachably assembled to at least one of the first
die and the second die so that when the first die and the second
die approach each other, the shaping members press and deform the
chassis thereon.
2. The shaping apparatus as claimed in claim 1, wherein the first
die is a lower die and the second die is an upper die.
3. The shaping apparatus as claimed in claim 1, wherein the shaping
members are made of polyurethane (PU) elastomer or rubber.
4. The shaping apparatus as claimed in claim 1, comprising at least
one shaping member disposed at the first die and at least one
shaping member disposed at the second die, wherein an inner surface
of the chassis is supported on a supporting surface of the shaping
member located at the first die, and the shaping member located at
the second die and moving along with the second die presses an
outer surface of the chassis through an inner surface of the
chassis so as to produce relative deformation of the inner surface
and the outer surface, wherein the outer surface is in the back of
the inner surface.
5. The shaping apparatus as claimed in claim 4, wherein orthogonal
projection of the shaping member located at the second die on the
outer surface or the inner surface and orthogonal projection of the
shaping member located at the first die on the inner surface or the
outer surface are not overlapped with each other.
6. The shaping apparatus as claimed in claim 4, wherein the
orthogonal projection of the shaping member located at the second
die on the outer surface or the inner surface and the orthogonal
projection of the shaping member located at the first die on the
inner surface or the outer surface are overlapped with each other,
and the pressing surface and the supporting surface are
complementary to each other.
7. The shaping apparatus as claimed in claim 1, wherein the shaping
members have different surface profiles.
8. The shaping apparatus as claimed in claim 1, wherein the machine
body is a stamping machine.
9. The shaping apparatus as claimed in claim 1, wherein parts of
the shaping members are disposed at the first die or the second die
in stackable way.
10. A shaping method for a chassis, suitable for a server and
comprising: providing a shaping apparatus which comprises a machine
body and a first die and a second die both disposed on the machine
body, wherein the machine body drives the second die to move
relatively to the first die so that the second die moves close to
or far away from the first die; disposing a plurality of shaping
members at at least one of the first die and the second die;
disposing and positioning a chassis at the first die; and driving
the second die to approach the first die, so that the shaping
members press the chassis and a first deformation generated in at
least one region of the chassis.
11. The shaping method for a chassis as claimed in claim 10,
wherein the chassis has an inner surface and an outer surface
backing to each other, and the shaping method for a chassis further
comprises: disposing the shaping members at the first die and the
second die respectively, wherein at least one shaping member
located at the first die has a supporting surface, at least one
shaping member located at the second die has a pressing surface,
and a first region of the inner surface of the chassis is supported
on the supporting surface; and pressing the outer surface of the
chassis with the pressing surface of the shaping member located on
the second die to deform a second region of the inner surface,
wherein the first region is not overlapped with the second
region.
12. The shaping method for a chassis as claimed in claim 10,
wherein the chassis has an inner surface and an outer surface
backing to each other, and the shaping method for a chassis further
comprises: disposing the shaping members at the first die and the
second die respectively, wherein at least one shaping member
located at the first die has a supporting surface, at least one
shaping members located at the second die has a pressing surface,
and a first region of the inner surface of the chassis is supported
on the supporting surface; and pressing the outer surface of the
chassis with the pressing surface of the shaping member located on
the second die to deform a second region of the inner surface,
wherein the first region is overlapped with the second region, and
a surface profile of the supporting surface and a surface profile
of the pressing surface are complementary to each other.
13. The shaping method for a chassis as claimed in claim 10,
further comprising: obtaining a load distribution of a plurality of
electronic components in the chassis of the server and calculating
a second deformation of the chassis in at least one region, wherein
direction of the first deformation is opposite to direction of the
second deformation, and amount of the first deformation is greater
than or equal to amount of the second deformation.
14. The shaping method for a chassis as claimed in claim 13,
further comprising: providing at least one shaping member stacked
on the shaping members when the amount of the first deformation is
less than the amount of the second deformation.
15. The shaping method for a chassis as claimed in claim 10,
wherein the shaping members are made of polyurethane (PU) elastomer
or rubber.
16. The shaping method for a chassis as claimed in claim 10,
wherein the shaping members have different surface profiles.
17. The shaping method for a chassis as claimed in claim 10,
wherein the machine body is a stamping machine.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the priority benefit of Taiwan
application serial no. 102112881, filed on Apr. 11, 2013. The
entirety of the above-mentioned patent application is hereby
incorporated by reference herein and made a part of this
specification.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention generally relates to a shaping apparatus, and
more particularly, to a shaping apparatus used for a chassis.
[0004] 2. Description of Related Art
[0005] In recent years, with the development of computer servers,
the traditional tower server featuring bulky shape and sizable
space-occupation has been gradually developed into the rack server
where several hosts with 1 U height (U refers specifically to the
thickness of a rack server in the server field, 1 U=4.445 cm) are
placed in a cabinet under a unified management.
[0006] Generally, each server unit in a rack server unit is
slidably disposed in a cabinet Based on this concept, the entire
device servo system can be seen as a big cabinet, and a plurality
of horizontally-placed drawers (i.e., chassis) of server units are
mounted in the cabinet. The server units in the drawers are
connected to each other to increase the multiplexing of a server
and achieve high computing performance.
[0007] Furthermore, under the premise of considering the
manufacturing costs, usually a cabinet or a chassis is designed to
have lightweight, but in order to advance the space utilization and
performance of the server, various required components are placed
in each chassis and occupy the space as much as possible. As a
result, the weight of these components will cause a considerable
load on the motherboard and the chassis. Generally speaking, the
weight of these components will make the motherboard and the
bearing chassis deformed along the gravity direction. But the
cabinet of a rack server, due to space considerations, will not
allow to reserve too much space between every server unit, so that
when the components on the motherboard need to be maintained or
fixed for failure, a lower-layer chassis may fail to be opened
since at the time, the weight of the components makes the
upper-layer chassis deformed towards the gravity direction to
interfere with the lower-layer chassis. One of the existing
solutions is to additionally process the underside of the chassis
to construct an inward-convex shape, which however will occupy the
inner space of the chassis to affect the layout of the inside
electronic components. Another of the existing solutions is to
dispose an additional metallic part at the underside of the chassis
to strengthen the underside, which will increase the cost and need
to perform riveting combination processes.
[0008] Accordingly, how to improve the structural features in the
fabrication process of the chassis to overcome the above-mentioned
deformation problem has become a subject eagerly to be solved.
SUMMARY OF THE INVENTION
[0009] Accordingly, the invention is directed to a shaping
apparatus and a shaping method for chassis with a simpler and
stable structure and process, and a larger applicable range.
[0010] A shaping apparatus of the invention is used for shaping a
chassis and includes a machine body, a first die, a second die and
a plurality of shaping members. The first die and the second die
are disposed at two opposite sides of the machine body. The machine
body drives the second die to move relatively to the first die so
that the second die moves close to or far away from the first die.
The shaping members are detachably assembled to at least one of the
first die and the second die so that the shaping members press and
deform the chassis thereon when the first die and the second die
approach each other.
[0011] A shaping method for a chassis of the invention includes
following steps: first, providing a shaping apparatus which
includes a machine body and a first die and a second die both
disposed on the machine body, in which the machine body drives the
second die to move relatively to the first die so that the second
die moves close to or far away from the first die; disposing a
plurality of shaping members on at least one of the first die and
the second die; disposing and positioning a chassis at the first
die; driving the second die to approach the first die, so that a
first deformation generated in at least one region of the chassis
by the shaping members pressing the chassis.
[0012] In an embodiment of the invention, the shaping members are
made of polyurethane (PU) elastomer or rubber.
[0013] In an embodiment of the invention, the shaping apparatus
includes at least one shaping member disposed at the first die and
at least one shaping member disposed at the second die, in which an
inner surface of the chassis is supported on a supporting surface
of the shaping member located at the first die, and the shaping
member located at the second die, moving along with the second die,
presses an outer surface of the chassis with a pressing surface so
as to deform the inner surface relative to the outer surface, in
which the outer surface backs to the inner surface.
[0014] In an embodiment of the invention, the orthogonal projection
of the shaping member located at the second die on the outer
surface or the inner surface and the orthogonal projection of the
shaping member located at the first die on the inner surface or the
outer surface are not overlapped with each other.
[0015] In an embodiment of the invention, the orthogonal projection
of the shaping member located at the second die on the outer
surface or the inner surface and the orthogonal projection of the
shaping member located at the first die on the inner surface or the
outer surface are overlapped with each other, and the pressing
surface and the supporting surface are complementary to each
other.
[0016] In an embodiment of the invention, the shaping members have
different surface profiles.
[0017] In an embodiment of the invention, the machine body is a
stamping machine.
[0018] In an embodiment of the invention, parts of the shaping
members are disposed at the first die or the second die in
stackable way.
[0019] In an embodiment of the invention, chassis has an inner
surface and an outer surface backing to each other, and the shaping
method for a chassis further includes: disposing the shaping
members at the first die and the second die respectively, in which
at least one shaping member located at the first die has a
supporting surface, at least one shaping member located at the
second die has a pressing surface. A first region of the inner
surface of the chassis is supported on the supporting surface; and
pressing the outer surface of the chassis by the pressing surface
of the shaping member located at the second die to deform a second
region of the inner surface, in which the first region is not
overlapped with the second region.
[0020] In an embodiment of the invention, the chassis has an inner
surface and an outer surface backing to each other, and the shaping
method for a chassis further includes: disposing the shaping
members at the first die and the second die respectively, in which
at least one shaping member located at the first die has a
supporting surface, at least one shaping members located at the
second die has a pressing surface. A first region of the inner
surface of the chassis is supported on the supporting surface; and
pressing the outer surface of the chassis by the pressing surface
of the shaping member located at the second die to deform a second
region of the inner surface, in which the first region is
overlapped with the second region, and the surface profile of the
supporting surface and the surface profile of the pressing surface
are complementary to each other.
[0021] In an embodiment of the invention, the shaping method for a
chassis further includes: obtaining a load distribution of a
plurality of electronic components in the chassis of the server;
calculating a second deformation of the chassis in at least one
region, in which the direction of the first deformation is opposite
to the direction of the second deformation, and the amount of the
first deformation is greater than or equal to the amount of the
second deformation.
[0022] In an embodiment of the invention, the shaping method for a
chassis further includes: providing at least one shaping member
stacked on the shaping members when the amount of the first
deformation is less than the amount of the second deformation.
[0023] Based on the description above, in the embodiments of the
invention, predetermined deformations of the chassis generated by
stamping shaping members disposed at the first die and the second
die onto the chassis enables the chassis effectively avoiding the
deformation thereof due to the weight after disposing electronic
components. In addition, the shaping members can be correspondingly
disposed at the first die and the second die according to the
disposing positions and the weight of the electronic components in
the chassis. The shaping members are detachably configured with the
first die and the second die, so that when the shape of the chassis
is different or the types and the layout of the electronic
components are altered, the shaping members can be re-arranged and
assembled again, such that the predetermined deformation is
generated in the corresponding places of the chassis. As a result,
the shaping apparatus has a larger applicable range without being
limited by the chassis and the layout of the electronic components
and accordingly, the fabrication cost of the shaping apparatus is
effectively reduced.
[0024] In order to make the features and advantages of the present
invention more comprehensible, the present invention is further
described in detail in the following with reference to the
embodiments and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 is a schematic diagram of a shaping apparatus
according to an embodiment of the invention.
[0026] FIG. 2 is a partial diagram of the shaping apparatus of FIG.
1.
[0027] FIG. 3 is another partial diagram of the shaping apparatus
of FIG. 1.
[0028] FIG. 4 is a partial diagram of a shaping apparatus according
to another embodiment of the invention.
[0029] FIG. 5 is a partial diagram of a shaping apparatus according
to yet another embodiment of the invention.
[0030] FIG. 6 is a flowchart of a shaping method for a chassis
according to an embodiment of the invention.
[0031] FIG. 7 is a partial equivalent diagram of FIG. 3.
DESCRIPTION OF THE EMBODIMENTS
[0032] FIG. 1 is a schematic diagram of a shaping apparatus
according to an embodiment of the invention. Referring to FIG. 1, a
shaping apparatus 100 is used to perform a shaping process for a
chassis 200 of a server. By means of the shaping process, the
chassis 200 gets predetermined deformation so as to, when
electronic components are borne on the chassis later, counteract
the deformation of the chassis 200 due to the weight of the
components. The structure feature of the shaping apparatus 100 is
described herein, followed by explaining the using method
thereof.
[0033] In the embodiment, the chassis 200 has a bottom plate 210
with an inner surface Si and an outer surface S2 opposite to each
other. After electronic components are disposed at the chassis 200,
the weight of the components deforms the bottom plate 210 towards
the outer surface S2 from the inner surface Si to form dents.
Therefore, during fabricating the chassis 200, the bottom plate 210
needs to produce reverse predetermined deformations to counteract
the sunken deformations of the chassis 200 after bearing the
electronic components later.
[0034] To implement the above-mentioned scheme, the shaping
apparatus 100 includes a machine body 110, a first die (i.e., a
lower die 130 disposed at the machine body 110 herein, as shown in
FIG. 1), a second die (i.e., an upper die 120 disposed at the
machine body 110 herein, as shown in FIG. 1) and a plurality of
shaping members 140. The machine body 110 is, for example, a
stamping machine, and the upper die 120 and the lower die 130 are
respectively disposed on the machine body 110 and opposite to each
other. In the embodiment, the stamping machine has a fixing side E1
and a moving side E2, the upper die 120 is disposed at the moving
side E2, the lower die 130 is disposed at the fixing side E1, and
the machine body 110 drives the upper die 120 to move relatively to
the lower die 130 by a control circuit and a mechanism (not shown)
thereof. In this way, the upper die 120 is close to or far away
from the lower die 130 for executing a stamping process.
[0035] The shaping members 140 are made of, for example,
polyurethane (PU) elastomer or rubber and are detachably assembled
to the upper die 120 and the lower die 130 respectively. In terms
of the material characteristic, the hardness of the shaping members
140 is lower than the hardness of the chassis 200 and elasticity,
so that the shaping members 140 serve as media to press and deform
the chassis 200 without damage.
[0036] The chassis 200 is suitable to be disposed and positioned at
the lower die 130, and meanwhile is supported on the shaping
members 140 located at the lower die 130. Therefore, when the upper
die 120 moves relatively to the lower die 130 and both approach to
each other, the shaping members 140 located at the upper die 120
and the lower die 130 respectively press the chassis 200 to perform
stamping deformation operation on the bottom plate 210. At the
time, portions of the bottom plate 210 are protruded towards the
inner surface S1 from the outer surface S2 thereof (the protrusion
herein is opposite to the above-mentioned sunken deformation and
serves as the reverse deformation of the sunken deformation). In
this way, by means of forming the predetermined deformation on the
bottom plate 210, these protruding places can serve as the
supporting structure of the electronic components when disposing
the electronic components at these protruding places. Thus, even
the weight of the electronic components causes the deformations of
the bottom plate 210, the above-mentioned protrusions with the
predetermined deformations can counteract the possible deformations
of the bottom plate 210.
[0037] FIG. 2 is a partial diagram of the shaping apparatus of FIG.
1. Referring to FIGS. 1 and 2, the shaping members 140 in the
embodiment are assembled to the upper die 120 by fastening screws
150. The lower die 130 can be disposed in the same way. In
following, the upper die 120 is taken as an example to explain the
disposing. As shown by FIG. 2, the upper die 120 has a plurality of
thread holes 121 arranged in array and the shaping members 140 have
a plurality of through holes 141 corresponding to the thread holes
121, so that the shaping members 140 are fastened at a specific
region of the upper die 120
[0038] The shapes, the quantity and the way of assembling them onto
the upper die 120 of the shaping members 140 are not limited
herein, and the designer can determine the corresponding disposing
of the shaping members 140 on the upper die 120 according to the
shapes of the predetermined deformations of the chassis 200 and the
deformation amount at each position. In addition, other combining
means repeatedly and detachably can be used in the embodiment.
Furthermore, the shaping members 140 can also being disposed onto
the same upper die 120 in different configurations, so that the
upper die 120 and the shaping members 140 are suitable for shaping
different chassis 200. In comparison with the exiting art where
different shaping dies are fabricated according to different
chassis and the different deformation positions and deformation
amounts thereof but each die has a fixed shape and is only suitable
for a specific object, the disclosure enables the upper die 120,
the lower die 130 and the shaping members 140 to be repeatedly
detached and allows to flexibly adjust the shapes and the amounts
of deformation, therefore, the shaping apparatus 100 of the
disclosure has a larger application range and lower fabrication
cost.
[0039] In another unshown embodiment, when the predetermined
deformations of the bottom plate of the chassis caused by the
shaping members disposed at the upper die and the lower die are not
expected, the user can add another shaping member stacked on the
existing shaping member so as to increase the amount of deformation
produced during stamping the chassis, in which the way of stacking
the shaping member is not limited. In fact, the additional shaping
member can be fastened or adhered with adhesives onto the die.
[0040] FIG. 3 is another partial diagram of the shaping apparatus
of FIG. 1. The chassis 200 in FIG. 3 has been stamped by the
shaping members 140. Referring to FIGS. 1 and 3, the shaping
members 140 located at the lower die 130 have a supporting surface
S3 that a first region A1 of the inner surface S1 of the chassis
200 positioned at the lower die 130 is supported on the supporting
surfaces S3 of the shaping members 140. In addition, the shaping
members 140 located at the upper die 120 have a pressing surface
S4. Along with the upper die 120 approaches the lower die 130, the
pressing surfaces S4 of the shaping members 140 press the outer
surface S2 of the bottom plate 210. It should be noted that when
the inner surface S1 (or the outer surface S2) serves as a
orthogonal projection surface, the orthogonal projection of the
shaping members 140 located at the upper die 120 on the bottom
plate 210 is not overlapped with the orthogonal projection of the
shaping members 140 located at the lower die 130 on the bottom
plate 210. In other words, the shaping members 140 of the
embodiment respectively disposed at the upper die 120 and the lower
die 130 are staggered. Thus, when the shaping members 140 located
at the upper die 120 press the bottom plate 210 thereon, the
shaping members 140 will cause deformations at a second region A2
of the inner surface S1, in which the first region A1 is not
overlapped with the second region A2 (in FIG. 3, the different
regions A1 and A2 of the inner surface S1 are marked with hidden
lines).
[0041] The shaping members in FIG. 3 have the same plane surface
profiles, which the invention is not limited to. FIG. 4 is a
partial diagram of a shaping apparatus according to another
embodiment of the invention. Referring to FIG. 4, in the
embodiment, the shaping members 340 located at the upper die 120
and the lower die 130 respectively are in partially misaligned
status by each other, i.e., the orthogonal projection of the
shaping members 340 located at the upper die 120 on the bottom
plate 410 of the chassis 400 is partially overlapped with the
orthogonal projection of the shaping members 340 located at the
lower die 130 on the bottom plate 410, and the shaping members 340
have different surface profiles. In the embodiment, the pressing
surface S4a formed by the shaping members 340 located at the upper
die 120 and the supporting surface S3a of the shaping members 340
located at the lower die 130 are complementary to each other.
[0042] FIG. 5 is a partial diagram of a shaping apparatus according
to yet another embodiment of the invention. Referring to FIG. 5,
similarly to the above-mentioned embodiment, the pressing surface
S4b formed by the shaping members 540 located at the upper die 120
and the supporting surface S3b of the shaping members 540 located
at the lower die 130 are complementary to each other, and the
orthogonal projection of the shaping members 540 located at the
upper die 120 on the bottom plate 610 is entirely overlapped with
the orthogonal projection of the shaping members 540 located at the
lower die 130 on the bottom plate 610. In other words, within the
inner surface S 1 a of the embodiment, the first region A3 is
overlapped with the second region A4.
[0043] FIG. 6 is a flowchart of a shaping method for a chassis
according to an embodiment of the invention and FIG. 7 is a partial
equivalent diagram of FIG. 3. Referring to 6, 3 and 7, in the
embodiment, in order to effectively reduce the deformation of the
chassis 200 caused by the weight of the inside electronic
components, first in step S610, the designer needs to obtain a load
distribution of a plurality of electronic components in the chassis
200 of the server, and calculating a second deformation F2 of the
bottom plate 210 of the chassis 200. In other words, during
designing the layout of the components of the server, the second
deformation F2 must be known. Next in step S620, a shaping
apparatus 100 is provided with the above-mentioned structure.
[0044] Then in step S630, a plurality of shaping members 140 are
disposed at corresponding places of the upper die 120 and the lower
die 130 according to the positions of the second deformations F2.
In step S640, when the machine body 110 drives the upper die 120 to
approach the lower die 130, the shaping members 140 press the
bottom plate 210 of the chassis 200 to generate the first
deformation F1 of the inner surface S1 and the outer surface S2.
The direction of the first deformation F1 herein is opposite to the
direction of the second deformation F2, and the amount of the first
deformation F1 is greater than or equal to the amount of the second
deformation F2. In this way, the predetermined deformations (i.e.,
the first deformations F1) formed in the chassis 200 by the shaping
members 140, the expected second deformations F2 in the chassis 200
generated by the weight of the electronic components can be
counteracted by the predetermined deformations, which further makes
the chassis 200 in the rack (not shown) of the servers smoothly
operated without structure interfere.
[0045] In summary, in the embodiments of the invention, the shaping
members are detachably disposed at the upper die and the lower die
of the shaping apparatus. By means of a stamping operation to
produce predetermined deformations of the chassis, this enables the
chassis effectively avoiding the deformation thereof due to the
weight after disposing electronic components. In addition, the
shaping members can be correspondingly at the upper die and the
lower die according to the disposing positions and the weight of
the electronic components in the chassis; i.e., when the shape of
the chassis is different or the types and the layout of the
electronic components are altered, by re-arranging the shaping
members, the predetermined deformations can be formed at the
corresponding places of the chassis. As a result, the shaping
apparatus has a larger applicable range without being limited by
the chassis and the layout of the electronic components and
accordingly, the fabrication cost of the shaping apparatus is
effectively reduced.
[0046] It will be apparent to those skilled in the art that the
descriptions above are several preferred embodiments of the
invention only, which does not limit the implementing range of the
invention. Various modifications and variations can be made to the
structure of the invention without departing from the scope or
spirit of the invention. The claim scope of the invention is
defined by the claims hereinafter.
* * * * *