阅读说明：本技术 座椅及其广告展示方法 (Seat and advertisement display method thereof ) 是由 王郑兴 王星 梁彦伟 张家宽 于 2018-05-18 设计创作，主要内容包括：本发明公开了一种座椅及其广告展示方法,该座椅包括座椅本体,座椅本体上设有悬臂,悬臂的一端与座椅本体活动连接,悬臂的另一端为自由端并设有安装臂,安装臂上安装有显示装置,安装臂和悬臂可转动连接,这样使得显示装置可以在两种显示状态之间转换：当显示装置处于第一显示状态时,显示装置的屏幕面向座椅的使用者；当显示装置处于第二显示状态时,显示装置的屏幕面向外界展示。本发明用于公共场所,既有座椅功能,也可实施广告投放。(The invention discloses a seat and an advertisement display method thereof, wherein the seat comprises a seat body, a cantilever is arranged on the seat body, one end of the cantilever is movably connected with the seat body, the other end of the cantilever is a free end and is provided with a mounting arm, a display device is arranged on the mounting arm, and the mounting arm and the cantilever are rotatably connected, so that the display device can be switched between two display states: when the display device is in a first display state, a screen of the display device faces a user of the seat; when the display device is in the second display state, the screen of the display device is displayed facing the outside. The invention is used in public places, has the function of a seat and can also implement advertisement putting.)

1. The utility model provides a seat, includes seat body (10), its characterized in that is equipped with cantilever (12) on seat body (10), the one end and seat body (10) swing joint of cantilever (12), and the other end of cantilever (12) is the free end and is equipped with installation arm (13), installs display device (14) on installation arm (13), installation arm (13) and cantilever (12) rotatable coupling, makes display device can change between two kinds of display states like this: when the display device is in a first display state, a screen of the display device faces a user of the seat; when the display device is in the second display state, the screen of the display device is displayed facing the outside.

2. A seat according to claim 1, characterized in that the display device (14) is rotatably connected relative to the mounting arm (13).

3. A seat according to claim 2, characterised in that the relative position between the display means (14) and the mounting arm (13) is locked by locking means.

4. A seat according to claim 1, characterized in that the seat body (10) comprises a backrest (11), the screen of the display device facing the backrest (11) when the display device is in the first display state, the display device being arranged above the backrest (11) when the display device is rotated to the second display state.

5. the seat according to claim 1, characterized in that, the left and right sides of the seat body (10) are respectively provided with a cantilever (12), the rear ends of the two cantilevers (12) are respectively hinged with the left and right sides of the backrest (11), the front ends of the two cantilevers (12) are respectively fixedly connected with or integrally formed with the mounting arm (13), the two cantilevers (12) are driven by a cantilever driving mechanism to synchronously rotate to realize the position conversion between the first staying state and the second staying state, when the cantilevers (12) are in the first staying state, the display device is in the first display state, and when the cantilevers (12) are in the second staying state, the display device is rotated to the second display state.

6. The seat according to claim 5, wherein the suspension arm driving mechanism comprises a rotating shaft (102), the rear ends of the left and right suspension arms (12) are respectively fixed at the left and right ends of the rotating shaft (102) in the circumferential direction, the rotating shaft (102) is installed on the seat body (10) through a bearing seat (1021), a first swing arm (1022) is fixedly arranged on the rotating shaft (102), the free end of the first swing arm (1022) is movably connected with one end of the electric push rod (104), and the other end of the electric push rod (104) is movably connected with the seat supporting frame (101).

7. A seat according to claim 1, characterized in that the pivotal change between the first and second states is effected by mechanical linkage, electrical adjustment or automatic adjustment depending on the centre of gravity between the display means (14) and the mounting arm (13).

8. the chair according to claim 1, wherein the display device is one or more of a CRT display, a liquid crystal display, an LED display, a plasma display, a tablet computer, a personal computer, a touch screen, a light box or an advertising display screen; the display device can be provided with a display screen only in the front, can also be provided with display screens on the front and the back, and can also be provided with an advertising lamp box or an advertising display screen behind the front arranged display screen.

9. A seat according to claim 1, characterized in that the seat body (10) is a massage chair fitted with a massage robot; the seat body (10) comprises a backrest, a cushion and a leg rest plate, and the backrest, the cushion and the leg rest plate are linked through a transmission mechanism; the seat body (10) includes a seat support frame (101) and a cover covering an outside of the seat support frame.

10. An advertisement presentation method comprising a seat as claimed in any one of claims 1 to 9, wherein when no user is present on the seat or when the user is not using the display device, the screen of the display device is used as an advertisement screen facing the outside.

Technical Field

The invention relates to the field of furniture, in particular to a seat and an advertisement display method thereof.

Background

Patent documents with publication numbers of CN204838687, CN104921488, CN206342185 and the like disclose an ergonomic computer cabin, which includes a base and a seat fixed on the top of the base, the front end and the rear end of the seat are respectively hinged with a shank support plate and a backrest, both sides of the rear end of the base are fixed with an electromechanical side box, the tops of the two electromechanical side boxes are respectively hinged with an adjustable armrest, one of the adjustable armrests is hinged with a keyboard support plate, the top end of the electromechanical side box is hinged with a mechanical arm assembly, the mechanical arm assembly includes an electromechanical lower arm hinged on the top end of the electromechanical side box and an electromechanical main arm hinged on the top end of the electromechanical lower arm, the top end of the electromechanical main arm is fixed with an electromechanical distribution box, and the bottom end of the electromechanical distribution box is. The user can operate the computer in a supine, semi-lying and upright sitting posture, and the distance and the angle between each part and the human body can be conveniently adjusted according to the requirement.

patent documents CN105832041A, CN205885121U, CN205885104U, etc. disclose a computer chair, which includes a base, a seat and a backrest, wherein an integrated armrest case is fixedly arranged on the base at two sides of the seat, respectively, and an armrest part is arranged at the front part of the upper end surface of the case of the integrated armrest case; a linear guide rail is arranged on the base along the front-back direction of the seat, and the seat is arranged on the linear guide rail; the top ends of the two integrated armrest cases correspond to the two supporting points of the cantilever assembly one by one and can be synchronously and rotatably connected; and a computer screen hanging frame is fixed at the front end of the cantilever assembly. When the user uses the computer chair, the user can operate the computer in a supine, semi-lying and upright sitting posture, the improper bending of the cervical vertebra, the lumbar vertebra and other parts of the user is avoided, the fatigue degree of the user is effectively relieved, and the use comfort degree of the user is greatly improved. When lying on the back or lying half way down, the user can adjust the interval between keyboard placing plate and the seat through adjusting the fore-and-aft position of seat.

The massage chair utilizes the mechanical rolling force action and the mechanical force extrusion to carry out massage, and the manual massage can dredge channels and collaterals, lead qi and blood to circulate and keep the yin-yang balance of the organism, so that people can feel relaxed muscles after massage, have flexible joints, excite people, eliminate fatigue and play an important role in ensuring the health. At present, seats such as massage chairs, leisure chairs and computer chairs which are placed in public places such as airports, railway stations, passenger centers, shopping centers and the like can only provide the functions of the seats, have less advertising functions, and only print simple patterns and characters on outer-layer wrapping objects of the seats, so that the advertising area is small and cannot be updated.

Disclosure of Invention

In order to solve the above-mentioned technical problems, it is an object of the present invention to provide a seat and an advertisement displaying method thereof, in which a display device mounted on the seat has two states: when a user sits on the seat to use the display device (in a first display state), the screen of the display device faces the user for the user to see and read; when the user is not present on the seat or the user does not use the display device (second display state), the screen of the display device is used as an advertisement screen facing the outside.

In order to achieve the purpose, the invention adopts the following technical scheme:

The utility model provides a seat, includes seat body (10), its characterized in that is equipped with cantilever (12) on seat body (10), the one end and seat body (10) swing joint of cantilever (12), and the other end of cantilever (12) is the free end and is equipped with installation arm (13), installs display device (14) on installation arm (13), installation arm (13) and cantilever (12) rotatable coupling, makes display device can change between two kinds of display states like this: when the display device is in a first display state, a screen of the display device faces a user of the seat; when the display device is in the second display state, the screen of the display device is displayed facing the outside.

Preferably, the display device (14) is rotatably connected relative to the mounting arm (13).

Further preferably, the relative position between the display device (14) and the mounting arm (13) is locked by a locking device.

Preferably, the seat body (10) comprises a backrest (11), a screen of the display device faces the backrest (11) when the display device is in the first display state, and the display device is arranged above the backrest (11) when the display device is rotated to the second display state.

Preferably, the left side and the right side of the seat body (10) are respectively provided with a cantilever (12), the rear ends of the two cantilevers (12) are respectively hinged with the left side and the right side of the backrest (11), the front ends of the two cantilevers (12) are respectively fixedly connected with the mounting arm (13) or integrally formed, the two cantilevers (12) are driven by a cantilever driving mechanism to synchronously rotate to realize position conversion between a first stop state and a second stop state, when the cantilevers (12) are in the first stop state, the display device is in a first display state, and when the cantilevers (12) are in the second stop state, the display device rotates to the second display state.

Preferably, the cantilever driving mechanism comprises a rotating shaft (102), the rear ends of the left cantilever and the right cantilever (12) are respectively fixed at the left end and the right end of the rotating shaft (102) in the circumferential direction, the rotating shaft (102) is installed on the seat body (10) through a bearing seat (1021), a first swing arm (1022) is fixedly arranged on the rotating shaft (102), the free end of the first swing arm (1022) is movably connected with one end of the electric push rod (104), and the other end of the electric push rod (104) is movably connected with the seat support frame (101).

Preferably, the display device (14) and the mounting arm (13) are rotationally displaceable between the first state and the second state by mechanical linkage, electrical adjustment or automatic adjustment dependent on the center of gravity.

Preferably, the display device is one or more of a CRT display, a liquid crystal display, an LED display, a plasma display, a tablet computer, a personal computer, a touch screen, a light box or an advertising display.

The display device can be provided with a display screen only in the front, can also be provided with display screens on the front and the back, and can also be provided with an advertising lamp box or an advertising display screen behind the front arranged display screen.

Preferably, the seat body (10) is a massage chair provided with a massage manipulator; the seat body (10) comprises a backrest, a cushion and a leg rest plate, wherein the backrest, the cushion and the leg rest plate are linked through a transmission mechanism. The seat body (10) includes a seat support frame (101) and a cover covering an outside of the seat support frame.

An advertisement display method is characterized by comprising the seat with the display device, wherein when no user is on the seat or the user does not use the display device, the screen of the display device faces the outside and is used as an advertisement screen.

The invention adopts the technical proposal, and the display device is switched between two states by rotating the display device: when a user sits on the seat to use the display device (in a first display state), the screen of the display device faces the user for the user to see and read; when the seat is not provided with a user or the user does not use the display device (in the second display state), the screen of the display device faces the outside and is used as an advertisement screen, the screen of the display device can be displayed forwards or backwards, and the display device can be arranged according to the placement position of the seat in public places. The invention is placed in public places, has the function of a seat and can also implement advertisement putting.

Drawings

FIG. 1 is a perspective view of a seat of the present invention (first display condition);

FIG. 2 is a perspective view of the seat of the present invention (second display condition);

FIG. 3 is a schematic view of the construction of the seat of the present invention (rear view);

FIG. 4 is a schematic view (rear view) of the cantilever drive mechanism of the present invention;

FIG. 5 is a schematic structural view (front view) of the seat of the present invention;

FIG. 6 is a schematic illustration (front view) of the cantilever drive mechanism of the present invention;

Fig. 7 is a schematic view of the mounting structure of the display device of the present invention.

Detailed Description

reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

For convenience of presentation, the present invention defines front-rear-left-right orientations with the user seated in the seat with the user facing forward and back.

The seat as shown in fig. 1 and 2 comprises a seat body 10, a cantilever 12 is arranged on the seat body 10, one end of the cantilever 12 is movably connected with the seat body 10, the other end of the cantilever 12 is a free end and is provided with a mounting arm 13, and a display device 14 is mounted on the mounting arm 13, wherein the mounting arm 13 and the cantilever 12 are fixedly connected, and the display device 14 is rotatably connected relative to the mounting arm 13 so that the display device can be switched between two display states: as shown in fig. 1, when the display device is in the first display state, the screen of the display device faces the user of the seat; as shown in fig. 2, when the display device is in the second display state, the screen of the display device is presented facing the outside. Thus, the display device 14 has two states: when a user sits on the seat to use the display device (in a first display state), the screen of the display device faces the user for the user to see and read; when the seat is not provided with a user or the user does not use the display device (in the second display state), the screen of the display device faces the outside and is used as an advertisement screen, the screen of the display device can be displayed forwards or backwards, and the display device can be arranged according to the placement position of the seat in public places. The environment is relative to a person other than the user seated on the seat.

The display device can be one or more of a CRT display, a liquid crystal display, an LED display, a plasma display, a tablet personal computer, a computer all-in-one machine, a touch screen, a lamp box or an advertisement display screen, the display device can be provided with a display screen only in the front, can also be provided with display screens on the front and the back, and can also be provided with an advertisement lamp box or an advertisement display screen on the back. The seat body can be provided with a loudspeaker, a sound box, an earphone jack and the like, and the display device can also be connected with a mobile phone, a PC controller, a player, a headset, a sound box, a keyboard, a mouse and the like through a data line, a wireless Bluetooth and the like. The massage chair can provide massage service and implement advertisement putting in public places consistent with the use places of the existing massage chairs.

in this embodiment, as shown in fig. 2, the seat body 10 includes a backrest 11, when the display device is in the first display state, the screen of the display device faces the backrest 11, and when the display device is rotated to the second display state, the display device is disposed above the backrest 11, so that the better advertisement display effect is achieved. The left side and the right side of the seat body 10 are respectively provided with a cantilever 12, the rear ends of the two cantilevers 12 are respectively hinged with the left side and the right side of the backrest 11, the front ends of the two cantilevers 12 are respectively fixedly connected with the mounting arm 13 or integrally formed, the two cantilevers 12 are driven by a cantilever driving mechanism to synchronously rotate to realize position conversion between a first staying state and a second staying state, when the cantilevers 12 are in the first staying state, the display device is in a first display state, and when the cantilevers 12 are in the second staying state, the display device rotates to the second display state.

The display device 14 and the mounting arm 13 are rotationally shifted between the first state and the second state by mechanical linkage, electrical adjustment or automatic adjustment depending on the center of gravity. The specific implementation mode of the mechanical linkage can be a pull wire transmission mechanism, a gear transmission mechanism, a connecting rod transmission mechanism or a transmission shaft mechanism, when the driving mechanism of the cantilever drives the cantilever to be switched between the two staying states, the driving mechanism transmits the motion to the rotating connection part of the display device and the mounting arm through the pull wire transmission mechanism, the gear transmission mechanism, the connecting rod transmission mechanism or the shaft transmission mechanism, and therefore the switching of the synchronous driving display device between the first display state and the second display state is achieved. The specific implementation mode of the electric adjustment can be a motor, an electric push rod, an electric control hydraulic cylinder and the like, for example, the display device is fixed on a rotating shaft or a shaft sleeve, the rotating shaft or the shaft sleeve is arranged on the mounting arm through a bearing and can rotate, and the rotating shaft or the shaft sleeve is directly connected with an output shaft of the motor or indirectly connected with the output shaft of the motor in a transmission way; for another example, the display device is hinged to the mounting arm and is driven to rotate around the hinge shaft by an electric push rod, an electric control hydraulic cylinder and the like. The electric adjustment mode can be controlled by an independent button or a remote controller, and the electric control unit can also be controlled by combining with the electric control unit of the cantilever. The specific mode of relying on the automatic adjustment of the center of gravity is that the display device is arranged on the mounting arm in a mode of rotation without hindrance, and the center of gravity of the display device is lower than the rotation axis of the display device, so that the display device is always kept in a vertical state in the rotation process of the cantilever, and certainly, the display device is inconvenient to use and needs to be positioned after being rotated in place by combining the locking device.

The display device 14 is disposed on the mounting arm 13 in a manner of being capable of moving back and forth, for example, the mounting frame of the display device is designed to be a sliding frame structure, and can be adjusted back and forth in a telescopic manner, so that the distance between the display device 14 and the user can be adjusted back and forth, the specific adjustment manner may be manual adjustment or electric adjustment, and the specific structure may refer to the prior art structures of patent documents with publication numbers CN206342185, CN205125597, CN104921488, CN102328624, CN102907927B, and the like.

The display device 14 is disposed on the mounting arm 13 in a manner capable of adjusting the inclination angle of the display screen, for example, the mounting frame of the display device is designed as a multi-link structure or a hinged arc-shaped slot locking structure, so that the user can adjust the display screen to the most suitable viewing angle, the specific adjustment manner may be manual adjustment or electric adjustment, the electric adjustment is preferably combined with the driving control of the aforementioned display device, and the manufacturing and use are convenient, and the specific structure may refer to the prior art structures of patent documents in the prior art, such as patent documents with publication numbers CN206342185, CN205125597, CN104921488, CN102328624, CN102907927, and the like.

The display device is connected with the mounting arm in a rotating mode in various ways, and the display device can be hinged and can be connected through a rotating shaft, a shaft sleeve or a bearing. But preferably, the display device can realize a rotating connection mode with a rotating range of more than 90 degrees, so that advertisement display can be carried out to the outside in a better and more-angle mode. When the display device is in the first display state or the second display state, that is, when the display device completes rotation, a locking device is preferably arranged to lock the position of the display device, and the locking device may be a bolt structure controlled by an electromagnet, a friction locking device provided with pressure by an armature or a spring, a fixed limiting block or a buckle structure, or a self-carried locking function of an executing component such as a motor, a push rod and the like.

The position relation between the axis of the rotating shaft of the display device and the center of gravity is important, and the axis of the rotating shaft of the display device is close to or even coincident with the center of gravity, so that the load of a display driving mechanism for driving the display driving mechanism to rotate can be reduced, and the display device can be driven to rotate conveniently. Of course, the display screen and the ground can form a fixed included angle by deviating the axis of the rotating shaft of the display device from the center of gravity by a fixed distance, so that the center of gravity of the display device can be used for resetting the display device in the two state conversion process, and the display device can also be positioned after being rotated in place by combining with the locking device.

In the present embodiment, the seat body 10 is a massage chair to which a massage robot is attached, and in other embodiments, it may be a leisure chair, a computer chair, or the like. The seat body 10 includes a backrest, a seat cushion, and a leg rest plate, and the backrest, the seat cushion, and the leg rest plate are linked by a transmission mechanism. Specific structures can be found in patent documents with publication numbers CN104055662, CN203915382, CN106073249, CN206792104, and CN 106419259. The cantilever and the mounting arm are pipe fittings.

Another embodiment of the present invention: seat, including the seat body, be equipped with the cantilever on the seat body, the one end and the seat body swing joint of cantilever, the other end of cantilever is the free end and is equipped with the installation arm, installs display device on the installation arm, and wherein, display device installs on the installation arm, thereby the installation arm makes display device can change between two kinds of display states for cantilever rotatable coupling: when the display device is in a first display state, a screen of the display device faces a user of the seat; when the display device is in the second display state, the screen of the display device is displayed facing the outside. The rotatable connection structure of the mounting arm and the cantilever may refer to the above-mentioned embodiment, and other structures may be the same as or similar to the above-mentioned embodiment.

In yet another embodiment of the present invention: seat, including the seat body, be equipped with the cantilever on the seat body, the one end and the seat body swing joint of cantilever, the other end of cantilever is the free end and is equipped with the installation arm, installs display device on the installation arm, and wherein, display device is for installation arm rotatable coupling, and the installation arm is for cantilever rotatable coupling to make display device can change between two kinds of display states: when the display device is in a first display state, a screen of the display device faces a user of the seat; when the display device is in the second display state, the screen of the display device is displayed facing the outside. Like this, rotatable between display device and the installation arm, rotatable between installation arm and the cantilever not only can realize display device through twice rotating-structure and change between two demonstration states, also can realize the conversion through a rotating-structure moreover, rotating-structure can be used to angle of adjustment or fine setting in addition, and structural arrangement is more reasonable like this, and it is more convenient to make the equipment. Other structures may be the same as or similar to the above-described embodiments.

one embodiment of the invention shown in fig. 3 to 7: a seat including a seat body 10, the seat body 10 including a seat support frame 101 and a cover covering an outside of the seat support frame; as shown in fig. 4, the suspension arm driving mechanism includes a rotating shaft and an electric push rod, the rear ends of the left and right suspension arms 12 are respectively fixed to the left and right ends of a rotating shaft 102 in the circumferential direction, and the rotating shaft 102 is mounted on the seat body 10 through two bearing seats 1021; a first swing arm 1022 is fixedly arranged on the rotating shaft 102, a free end of the first swing arm 1022 is movably connected with one end of the electric push rod 104, and the other end of the electric push rod 104 is movably connected with the seat supporting frame 101. As shown in fig. 4 and 7, the display device 14 is hinged to the mounting arm 13, one end of the pull wire 106 is connected to the display device 14, the other end of the pull wire 106 is connected to the pull wire base 105, the pull wire base 105 is rotatably mounted on the seat support frame 101, the second swing arm 1023 is fixedly mounted on the rotating shaft 102, the free end of the second swing arm 1023 drives the pull wire base 105 to swing so as to pull the pull wire 106 to rotate to the first display state or the second display state, the display device 14 is reset by self weight or an elastic member, and the elastic member may be a torsion spring disposed on a hinge shaft of the display device or a tension spring disposed between the display device and the mounting arm. A fixed seat 103 is fixed on the seat support frame 101, and one end of the wire pulling seat 105 is hinged with the fixed seat 103. The display device 14 is mounted on the mounting arm 13 through the mounting frame 141 and the mounting seat 131, the mounting frame 141 is fixedly connected with the display device 14, the mounting seat 131 is fixedly connected with the mounting arm 13, the mounting frame 141 is hinged to the mounting seat 131, and one end of the pull wire 106 is connected with a swinging part of the mounting frame 141. The outer surface of the pull wire 106 is sleeved with a pull wire sleeve 1061, one end of the pull wire sleeve 1061 is connected with the mounting seat 131, and the other end of the pull wire sleeve 1061 is connected with the fixed seat 103. A return spring is mounted between the display device 14 and the mounting arm 13.

An advertisement display method comprises the seat with the display device, and when no user is on the seat or the user does not use the display device, a screen of the display device faces the outside and is used as an advertisement screen.

in the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.