U.S. patent application number 15/730671 was filed with the patent office on 2019-04-11 for case with assembly structure and electronic device using thereof.
The applicant listed for this patent is GETAC TECHNOLOGY CORPORATION. Invention is credited to Yao-Kun Cheng.
Application Number | 20190110369 15/730671 |
Document ID | / |
Family ID | 65993668 |
Filed Date | 2019-04-11 |
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United States Patent
Application |
20190110369 |
Kind Code |
A1 |
Cheng; Yao-Kun |
April 11, 2019 |
Case with assembly structure and electronic device using
thereof
Abstract
A case with assembly structure includes a body, an engaging
portion, a fixing element and an elastic element. The body has an
accommodating slot and the engaging portion is disposed in the
accommodating slot. The fixing element is slidably disposed on the
main body and is located on one side of the accommodation slot and
adjacent to the engaging portion. The fixing element has a hook.
One end of the elastic element is disposed to the body and another
end is disposed to the fixing element. The fixing element is moved
between a fixed position and a release position along a first
direction. When the fixing element is moved to the release
position, the hook of the fixing element is moved along a second
direction to hook the engaging portion. Meanwhile, the elastic
element is made the fixing element be pulled toward the fixed
position.
Inventors: |
Cheng; Yao-Kun; (Taipei
City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GETAC TECHNOLOGY CORPORATION |
Hsinchu COUNTY |
|
TW |
|
|
Family ID: |
65993668 |
Appl. No.: |
15/730671 |
Filed: |
October 11, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H05K 5/0091 20130101;
H05K 5/03 20130101; H05K 5/0086 20130101; H01M 2/1022 20130101;
H01M 2/1066 20130101; H05K 5/0221 20130101 |
International
Class: |
H05K 5/02 20060101
H05K005/02; H05K 5/03 20060101 H05K005/03; H05K 5/00 20060101
H05K005/00; H01M 2/10 20060101 H01M002/10 |
Claims
1. A case with an assembly structure, comprising: a body having a
receiving slot; an engaging portion disposed in the receiving slot;
a fixing element disposed on the body, beside the receiving slot,
and proximate to the engaging portion, the fixing element
comprising a hook, and the fixing element being slidable along an
axis between a released position and a locked position; and an
elastic component with an end disposed at the body and another end
disposed at the fixing element, arranged such that when the fixing
element is moved along the axis from the locked position to the
released position, the elastic component generates a restoring
force to drive the fixing element back along the axis to the locked
position, and wherein when the fixing element is moved from the
locked position to the released position, the hook of the fixing
element becomes engaged with the engaging portion so as to hold the
fixing element in the released position against the restoring force
of the elastic component.
2. The case with an assembly structure according to claim 1,
further comprising a lid and an operating element, the lid being
fastened to the body and having a guide hole, and the operating
element being mounted on the fixing element and sliding within the
guide hole.
3. The case with an assembly structure according to claim 2,
wherein the guide hole has a positioning portion, and the operating
element slides and moves in the second direction to reach the
positioning portion.
4. The case with an assembly structure according to claim 2,
wherein the operating element comprises at least one raised
portion, and the fixing element further comprises at least one
raised track, allowing the at least one raised portion to slide and
move in the second direction to any one side of the at least one
raised track selectively.
5. The case with an assembly structure according to claim 1,
wherein the fixing element further comprises at least one
positioning element protruding in the second direction.
6. The case with an assembly structure according to claim 5,
wherein the at least one positioning element comprises a ramp.
7. An electronic device, comprising: a case comprising: a body
having a receiving slot; an engaging portion disposed in the
receiving slot; a fixing element disposed on the body, beside the
receiving slot, and proximate to the engaging portion, the fixing
element comprising a hook and a protruding element, and the fixing
element being slidable along an axis between a released position
and a locked position; and an elastic component with an end
disposed at the body and another end disposed at the fixing
element, arranged such that when the fixing element is moved along
the axis from the locked position to the released position, the
elastic component generates a restoring force to drive the fixing
element back along the axis to the locked position; and a battery
pack comprising a pushing element, wherein when the fixing element
is moved from the locked position to the released position, the
hook of the fixing element becomes engaged with the engaging
portion so as to hold the fixing element in the released position
against the restoring force of the elastic component, and when the
fixing element is in the released position and the battery pack is
inserted into the receiving slot, the pushing element pushes the
protruding element so that the hook separates from the engaging
portion, and the restoring force of the elastic component causes
the fixing element to move to the locked position.
8. The electronic device according to claim 7, wherein the fixing
element further comprises at least one positioning element
protruding in the second direction, and the battery pack further
comprises at least one blocking element, thereby allowing the at
least one positioning element to block the at least one blocking
element as a result of movement of the fixing element to the locked
position and insertion of the battery pack into the receiving
slot.
9. The electronic device according to claim 8, wherein the at least
one positioning element comprises a ramp.
10. The electronic device according to claim 7, further comprising
a lid and an operating element, the lid being fastened to the body
and having a guide hole, and the operating element being mounted on
the fixing element and sliding within the guide hole.
11. The electronic device according to claim 10, wherein the guide
hole has a positioning portion, and the operating element slides
and moves in the second direction to reach the positioning
portion.
12. The electronic device according to claim 10, wherein the
operating element comprises at least one raised portion, and the
fixing element further comprises at least one raised track,
allowing the at least one raised portion to slide and move in the
second direction to any one side of the at least one raised track
selectively.
13. The case with an assembly structure according to claim 1,
wherein when the fixing element is moved from the locked position
to the released position, the hook of the fixing element moves in a
direction perpendicular to the axis to become engaged with the
engaging portion.
14. The case with an assembly structure according to claim 7,
wherein when the fixing element is moved from the locked position
to the released position, the hook of the fixing element moves in a
direction perpendicular to the axis to become engaged with the
engaging portion.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
[0001] The present invention relates to assembly structures and
electronic devices using the same and, more particularly, to a case
with an assembly structure and an electronic device using the same,
characterized in that a battery is automatically fastened in place
after being mounted on the electronic device.
Description of the Prior Art
[0002] A typical, conventional portable electronic device often
comes with a battery in order to be operating anywhere
conveniently. The battery is demountable and thus replaceable
whenever it runs out of power and a charging source is unavailable.
The demountable battery may be mounted on the electronic device by
two conventional techniques: first, mounting the battery on the
electronic device and then covering it with a lid to prevent its
detachment; second, mounting and fastening the battery onto the
electronic device with an engagement structure thereof.
[0003] The second technique further requires a user to pull a
fixing element by hand in order for the mounted battery to be
fastened and fixed in place. Alternatively, a spring structure
disposed in the electronic device enables the battery to be
automatically fastened and fixed in place when mounted on the
electronic device and thus dispenses with the need for the
aforesaid manual operation.
SUMMARY OF THE INVENTION
[0004] The aforesaid technique of pulling a fixing element by hand
has a drawback: if a user forgets to fasten a battery in place
after mounting the battery on an electronic device, the battery is
likely to loosen and fall off, thereby ending up in damage.
[0005] The aforesaid spring structure cannot work without the
user's fixing the fixing element at a locked position and then
pushing the fixing element as soon as the battery is mounted in
place, thereby allowing the fixing element to return to the locked
position under a restoring force of a spring. Although the
aforesaid spring structure precludes the situation where the user
forgets to fasten the battery in place, it brings inconvenience to
the user, because the user has to keep pushing the fixing element
while demounting the battery.
[0006] In view of this, the present invention in an embodiment
thereof provides a case with an assembly structure. The case
comprises a body, an engaging portion, a fixing element and an
elastic component. The body has a receiving slot. The engaging
portion is disposed in the receiving slot. The fixing element is
disposed on the body slidably, beside the receiving slot, and
proximate to the engaging portion. The fixing element has a hook.
The elastic component has one end disposed at the body and the
other end disposed at the fixing element. The fixing element moves
in a first direction to a locked position and a released position.
If the fixing element moves to the released position, the hook of
the fixing element moves in a second direction perpendicular to the
first direction to become engaged with the engaging portion, and
the elastic component drives the fixing element toward the locked
position.
[0007] The present invention in another embodiment thereof provides
an electronic device. The electronic device comprises a case and a
battery pack. The case comprises a body, an engaging portion, a
fixing element, and an elastic component. The body has a receiving
slot. The engaging portion is disposed in the receiving slot. The
fixing element is disposed on the body slidably, beside the
receiving slot, and proximate to the engaging portion. The fixing
element has a hook. The elastic component has one end disposed at
the body and the other end disposed at the fixing element. The
battery pack comprises a pushing element. The fixing element moves
in the first direction to a locked position and a released
position. If the fixing element moves to the released position, the
hook of the fixing element moves in a second direction
perpendicular to the first direction to become engaged with the
engaging portion, and the elastic component drives the fixing
element toward the locked position, wherein positioning the fixing
element at the released position and inserting the battery pack
into the receiving slot together causes the pushing element to push
the protruding element so that the hook separates from the engaging
portion, and the elastic component causes the fixing element to
move to the locked position.
[0008] Given the aforesaid assembly structure, when the battery
pack is to be removed or is not mounted on the case, the fixing
element is moved to the released position and fixed at the released
position without any chance of going back to the locked position.
Therefore, the user can demount the battery pack without pushing
the fixing element continuously.
[0009] The elastic component provides an acting force under which
the fixing element is driven toward the locked position
continuously. As soon as the battery pack is received in the
receiving slot, the hook of the fixing element separates from the
engaging portion, and the elastic component causes the fixing
element to move to the locked position, thereby causing the fixing
element to automatically fasten the battery pack in place.
Therefore, the user need not pull the fixing element by hand in
order to move it to the locked position. Accordingly, the situation
where the user forgets to fasten the battery pack after mounting
the battery pack in place and in consequence the battery pack
loosens, falls off and gets damaged is impossible to occur.
[0010] In some embodiments, the case further comprises a lid and an
operating element. The lid is fastened to the body. The lid has a
guide hole. The operating element is mounted on the fixing element
and slides within the guide hole. The operating element enables the
user to move the fixing element from the locked position to the
released position easily. The guide hole ensures that the operating
element slides within a specific range of distances.
[0011] In some embodiments, to preclude the situation where the
user carrying or operating the electronic device inadvertently
triggers the operating element to move to the released position
after the fixing element has slid and moved to the locked position
under the acting force exerted by the elastic component, the guide
hole has a positioning portion, and the operating element slides
and moves in the second direction to reach the positioning
portion.
[0012] In some embodiments, the operating element comprises at
least one raised portion, and the fixing element further comprises
at least one raised track. The at least one raised portion slides
and moves in the second direction to any one side of the at least
one raised track selectively. Therefore, when the operating element
is to move to the positioning portion, the at least one raised
portion and the at least one raised track operate jointly to give
the user a sense of operating the operating element and thus assure
the user that the operating element has been positioned in place.
Furthermore, the raised tracks serve a positioning purpose to
prevent the operating element from moving slidingly out of the
positioning portion.
[0013] In some embodiments, the fixing element further comprises at
least one positioning element, and the at least one positioning
element protrudes in the second direction. The battery pack further
comprises at least one blocking element so that if the fixing
element moves to the locked position and the battery pack is
received in the receiving slot, the at least one positioning
element blocks the at least one blocking element, respectively.
Therefore, if the battery pack is received in the receiving slot
and the fixing element has moved to the locked position, the at
least one positioning element blocks the battery pack and prevents
the battery pack from loosening.
[0014] In some embodiments, the at least one positioning element
comprises a ramp. If the fixing element is not fixed to the
released position, it is not necessary to move the fixing element
to the released position beforehand in order to mount the battery
pack on the case. What the user needs to do is to press the battery
pack into the receiving slot and allow the blocking elements to
push the fixing element along the ramps so that the fixing element
moves toward the released position, thereby allowing the battery
pack to be received in the receiving slot. After the battery pack
has been mounted on the case, the fixing element moves to the
locked position under the restoring force of the elastic component.
Therefore, the process performed by the user to mount and fasten
the battery pack to the case according to the present invention is
simpler than its conventional counterpart.
[0015] The features and advantages of the present invention are
detailed hereinafter with reference to the preferred embodiments.
The detailed description is intended to enable persons skilled in
the art to gain insight into the technical contents disclosed
herein and implement the present invention accordingly. In
particular, persons skilled in the art can easily understand the
objectives and advantages of the present invention by referring to
the disclosure of the specification, the claims, and the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is a schematic view of assembly of an electronic
device according to the first embodiment of the present
invention;
[0017] FIG. 2 is an exploded view of the electronic device
according to the first embodiment of the present invention;
[0018] FIG. 3 is a partial cutaway enlarged view of an assembly
structure according to the first embodiment of the present
invention;
[0019] FIG. 4 is a partial enlarged view of the electronic device
according to the first embodiment of the present invention; and
[0020] FIG. 5 is a cross-sectional schematic view of a fixing
element which has moved to a locked position according to the first
embodiment of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] The technical solutions proposed herein to achieve the
objectives of the present invention are further described below
with reference to accompanying drawings and preferred embodiments
of the present invention. Persons skilled in the art understand
that directional wording, including "above" and "downward," used in
describing the preferred embodiments of the present invention is
illustrative of directions in the accompanying drawings rather than
restrictive of the present invention. Moreover, persons skilled in
the art may make numerous variations and changes in the preferred
embodiments of the present invention without departing from the
spirit and scope of the present invention, and the resultant
preferred embodiments of the present invention must be deemed
falling within the scope of the present invention.
[0022] Referring to FIG. 1 through FIG. 5, there are shown in FIG.
1 a schematic view of assembly of an electronic device according to
the first embodiment of the present invention, in FIG. 2 an
exploded view of the electronic device according to the first
embodiment of the present invention, in FIG. 3 a partial cutaway
enlarged view of an assembly structure according to the first
embodiment of the present invention, in FIG. 4 a partial enlarged
view of the electronic device according to the first embodiment of
the present invention, and in FIG. 5 a cross-sectional schematic
view of a fixing element which has moved to a locked position
according to the first embodiment of the present invention. In the
aforesaid embodiments, an electronic device 100 comprises a case
101 and a battery pack 102. Referring to FIG. 1, the battery pack
102 is mounted on the case 101 to supply power to the electronic
device 100 and thus render it portable. In this embodiment, the
case 101 may be equipped with two battery packs 102. In a variant
embodiment, the case 101 is equipped with one, two or more battery
packs 102, but the present invention is not limited thereto.
[0023] To illustrate directions of movement of related components
according to the present invention, FIG. 2 depicts a coordinate
system defined by X-axis, Y-axis, and Z-axis which extend in the
first direction, the second direction perpendicular to the first
direction, and the third direction perpendicular to the first and
second directions, respectively. Referring to FIG. 2 and FIG. 3,
the case 101 with an assembly structure comprises a body 10, an
engaging portion 20, a fixing element 30, and an elastic component
40. In this embodiment, two identical battery packs 102 are mounted
on the case 101 and associated with the same assembly structure;
hence, only one of the two battery packs 102 and the corresponding
assembly structure are described hereunder for illustrative
sake.
[0024] The body 10 has a receiving slot 11 for receiving the
battery pack 102. The engaging portion 20 is disposed in the
receiving slot 11. In this embodiment, the engaging portion 20 is a
groove disposed on a blocking wall 111 which is formed and raised
in the receiving slot 11. The fixing element 30 is disposed on the
body 10 slidably, beside the receiving slot 11, and proximate to
the engaging portion 20. Referring to FIG. 2, the fixing element 30
is disposed between the short side of the receiving slot 11 and the
blocking wall 111 and slides along X-axis. The fixing element 30
comprises a hook 31. The hook 31 of the fixing element 30 is
engaged with the engaging portion 20 to allow the fixing element 30
to be fixed at a released position. Alternatively, the hook 31 of
the fixing element 30 is separated from the engaging portion 20 to
allow the fixing element 30 to move to the locked position. Its
operation is described later.
[0025] Referring to FIG. 3, the elastic component 40 has one end
disposed at the body 10 and the other end disposed at the fixing
element 30. Likewise, the elastic component 40 is received in the
receiving slot 11 and inside the fixing element 30, as shown in
FIG. 3. In this embodiment, the elastic component 40 is a spring
with one end fixed to a first hook 112 protruding from the
receiving slot 11 and the other end fixed to a second hook 36
protrudingly disposed at the fixing element 30.
[0026] Referring to FIG. 2 through FIG. 5, in this embodiment, the
fixing element 30 moves along X-axis (the first direction) to reach
the locked position and the released position. The battery pack 102
received in the receiving slot 11 is blocked and fixed in place and
thus cannot loosen as soon as the fixing element 30 moves to the
locked position. The battery pack 102 can be demounted and removed
from the receiving slot 11 as soon as the fixing element 30 moves
to the released position.
[0027] Referring to FIG. 2, if the fixing element 30 moves to the
released position, the hook 31 of the fixing element 30 moves along
Y-axis (the second direction) to become engaged with the engaging
portion 20. Referring to FIG. 2, in this embodiment, a rail 1111 is
concavely disposed on the blocking wall 111. A ramp is disposed on
the sidewall of the rail 1111. The ramp extends forward along
X-axis and tilts backward along Y-axis. When the fixing element 30
is located at the locked position shown in FIG. 5, the hook 31 of
the fixing element 30 fits inside the rail 1111. When the fixing
element 30 moves forward along X-axis, the hook 31 moves backward
along Y-axis, because the hook 31 is pushed by the sidewall of the
rail 1111 which tapers. It is only when the hook 31 moves and
reaches the engaging portion 20 located at the terminal end of the
rail 1111 that the hook 31 springs forward along Y-axis under an
acting force exerted by an elastic arm and thus becomes fixed to
the engaging portion 20.
[0028] When the fixing element 30 is located at the released
position, the elastic component 40 drives the fixing element 30
toward the locked position. In this embodiment, the elastic
component 40 is a spring and is exemplified by a tension spring.
When the fixing element 30 moves to the released position, the
elastic component 40 is stretched forward along X-axis to generate
a restoring force. Since one end of the elastic component 40 is
fixed to the fixing element 30, the fixing element 30 moves
backward along X-axis under the restoring force of the elastic
component 40.
[0029] When the battery pack 102 is unlocked in order to be removed
or is not mounted on the case 101, the fixing element 30 is moved
to the released position and fixed at the released position without
any chance of going back to the locked position. Therefore, a user
can demount the battery pack 102 without pushing the fixing element
30 continuously.
[0030] Referring to FIG. 2 through FIG. 5, when the battery pack
102 is received in the receiving slot 11, the hook 31 of the fixing
element 30 is pushed by the battery pack 102 and thus separated
from the engaging portion 20. At this point in time, under the
restoring force exerted by the elastic component 40, the fixing
element 30 moves backward along X-axis and reaches the locked
position so that the fixing element 30 fixes the battery pack 102
in place, thereby allowing the battery pack 102 to be fixed in
place without any chance of loosening while in use or in motion.
Therefore, the user need not pull the fixing element 30 by hand in
order to move it to the locked position. Accordingly, the situation
where the user forgets to fasten the battery pack 102 after
mounting the battery pack 102 in place and in consequence the
battery pack 102 loosens, falls off and gets damaged is impossible
to occur.
[0031] Referring to FIG. 2 and FIG. 5, in this embodiment, the case
101 further comprises a lid 50 and an operating element 60. The lid
50 is fastened to the body 10 to cover the fixing element 30. The
lid 50 has a guide hole 51. The operating element 60 is mounted on
the fixing element 30 and slides within the guide hole 51.
Referring to FIG. 5, the operating element 60 has two hook portions
62 whereby the operating element 60 is mounted on and fixed to the
fixing element 30 so that the user can move the fixing element 30
from the locked position to the released position easily. The
purpose of the guide hole 51 is to restrict the slide of the
operating element 60 to between the locked position and the
released position and thus restrict the movement of the fixing
element 30, which the operating element 60 is fixed to, to between
the two positions.
[0032] To preclude the situation where the user carrying or
operating the electronic device 100 inadvertently triggers the
operating element 60 to move to the released position after the
fixing element 30 has slid and moved to the locked position under
the acting force exerted by the elastic component 40, the guide
hole 51 has a positioning portion 511, and the operating element 60
slides and moves along Y-axis to reach the positioning portion 511.
The positioning portion 511 corresponds in shape to the operating
element 60. After the operating element 60 has been pushed and
moved to the positioning portion 511, the positioning portion 511
prevents the operating element 60 from moving along X-axis.
[0033] Referring to FIG. 5, in this embodiment, the operating
element 60 further comprises four raised portions 61, and the
fixing element 30 further comprises two raised tracks 35. In this
regard, the aforesaid quantity of the raised portions 61 and raised
tracks 35 merely serves an exemplary purpose and thus is subject to
changes as needed. The four raised portions 61 are disposed on the
operating element 60 and face the fixing element 30. To afford
possibility for the operating element 60 to move across a plane,
the raised portions 61 are disposed at the four corners of the
operating element 60, respectively. The raised portions 61 located
on the long side of the operating element 60 slide and move
backward along Y-axis to reach the side of the raised tracks 35 as
soon as the operating element 60 is pushed and moved to the
positioning portion 511. Moving the raised portions 61 past the
raised tracks 35 gives the user a sense of operating the operating
element 60 and thus assures the user that the operating element 60
has been positioned in place. Furthermore, the raised tracks 35
serve a positioning purpose to prevent the operating element 60
from moving slidingly out of the positioning portion 511.
[0034] Referring to FIG. 2 and FIG. 5, in this embodiment, in
addition to the hook 31, the fixing element 30 comprises a
protruding element 34. The protruding element 34 is adjacent to the
hook 31. The battery pack 102 comprises a pushing element 70.
Referring to FIG. 2 and FIG. 5, the protruding element 34 of the
fixing element 30 is disposed above the hook 31, as shown in FIG.
2. When the fixing element 30 is located at the released position
shown in FIG. 2, insertion of the battery pack 102 into the
receiving slot 11 drives the pushing element 70 of the battery pack
102 to the protruding element 34, thereby separating the hook 31
from the engaging portion 20. Upon the separation of the hook 31
from the engaging portion 20, the fixing element 30 moves toward
the locked position under the restoring force of the elastic
component 40.
[0035] The fixing element 30 further comprises two positioning
elements 33. The two positioning elements 33 protrude along Y-axis
and toward the battery pack 102. The battery pack 102 further
comprises two blocking elements 80. In this regard, the quantity of
the positioning elements 33 and blocking elements 80 merely serves
an exemplary purpose and thus is subject to changes as needed. In a
variant embodiment, the positioning elements 33 and the blocking
elements 80 are each in the number of one, two or more. Referring
to FIG. 5, when the fixing element 30 moves to the locked position
and the battery pack 102 is received in the receiving slot 11, the
positioning elements 33 block the blocking elements 80,
respectively. In this embodiment, the positioning elements 33
correspond in quantity to the blocking elements 80, and the
positioning elements 33 block the blocking elements 80,
respectively.
[0036] Referring to FIG. 2 and FIG. 5, when the fixing element 30
is located at the released position, the positioning elements 33
are aligned forward along X-axis. At this point in time, insertion
of the battery pack 102 into the receiving slot 11 causes the
blocking elements 80 to move downward smoothly without being
blocked by the positioning elements 33. After the battery pack 102
has been received in the receiving slot 11, the fixing element 30
moves backward along X-axis under the acting force of the elastic
component 40 to reach the locked position, and thus the positioning
elements 33 are above the blocking elements 80. The insertion of
the battery pack 102 into the receiving slot 11 and movement of the
fixing element 30 to the locked position enable the positioning
elements 33 to block the battery pack 102, thereby preventing the
battery pack 102 from loosening.
[0037] Referring to FIG. 2, the positioning elements 33 each
comprise a ramp 331. In this embodiment, the ramps 331 each extend
forward along X-axis and tilt forward along Z-axis. If the fixing
element 30 is not fixed to the released position, it is not
necessary to move the fixing element 30 to the released position
beforehand in order to mount the battery pack 102 on the case 101.
What the user needs to do is to press the battery pack 102 into the
receiving slot 11 and allow the blocking elements 80 to push the
fixing element 30 along the ramps 331 so that the fixing element 30
moves toward the released position, thereby allowing the battery
pack 102 to be received in the receiving slot 11. After the battery
pack 102 has been mounted on the case 101, the fixing element 30
moves to the locked position under the restoring force of the
elastic component 40. Therefore, the process performed by the user
to mount and fasten the battery pack 102 to the case 101 according
to the present invention is simpler than its conventional
counterpart.
[0038] Although the present invention is disclosed above by
preferred embodiments, the preferred embodiments are not
restrictive of the present invention. Changes and modifications
made by persons skilled in the art to the preferred embodiments
without departing from the spirit and scope of the present
invention must be deemed falling within the scope of the present
invention. Accordingly, the legal protection for the present
invention should be defined by the appended claims.
* * * * *