UNLOCKING DEVICE FOR FOLDABLE CHAIR AND FOLDABLE CHAIR WITH UNLOCKING DEVICE

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application serial no.202421774458.8, filed on Jul. 24, 2024. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The present disclosure relates to relates to the technical field of chairs. More specifically, the present disclosure relates to an unlocking device for a foldable chair and a foldable chair with an unlocking device.

Description of Related Art

As a portable and foldable chair, a foldable chair has been widely used in the daily life of people. The foldable chair is not only convenient to move, but also saves space. For example, a folding-type space chair disclosed by China Utility Model Patent Publication of CN220141181U comprises a chair seat and a foldable chair frame, which has good structural stability. Because there is extrusion to produce a very big frictional force in elasticity from an elastic self-locking piece and an inner shell of a first opening slot, the operation process needs great strength when unfolding and folding the foldable chair, which is unfavorable for assembling, and causes operation difficulty.

SUMMARY

The present disclosure provides an unlocking device for a foldable chair and a foldable chair with an unlocking device.

The present disclosure provides an unlocking device for a foldable chair is provided, wherein a chair frame of the foldable chair comprises a front connecting rod, the front connecting rod comprises a left front connecting rod and a right front connecting rod, and the unlocking device comprises:

• • a rotary connecting piece, a right end of which is fixedly connected with a left end of the right front connecting rod, wherein a right end of the left front connecting rod abuts against or contacts with a left front side of the rotary connecting piece;
  • a ratchet which is rotationally connected with a left end of the rotary connecting piece, wherein only a part of a periphery of the ratchet is provided with a tooth, and the ratchet is fixedly connected with a right end of the left front connecting rod;
  • an elastic piece, one end of which is connected with the rotary connecting piece and abuts against the rotary connecting piece; and
  • an unlocking handle, one end of which is rotatably connected with the rotary connecting piece, and is provided with a pawl engaged with the tooth on the ratchet thereon, wherein the other end of the elastic piece abuts against the other end of the unlocking handle, and drives the pawl to abut against the tooth on the ratchet and restricts the ratchet from rotating counterclockwise; and when the other end of the unlocking handle is pressed, the pawl is separated from the tooth on the ratchet, and the ratchet rotates counterclockwise.

Preferably, in the unlocking device for the foldable chair, an inside of the rotary connecting piece is hollow, and left, right and front sides of the rotary connecting piece are all open, left ends of the ratchet and the unlocking handle are rotatably connected with a top of the rotary connecting piece and a bottom of the rotary connecting piece through a first axis and a second axis respectively, and a left end of the right front connecting rod is fixedly connected with the top of the rotary connecting piece and the bottom of the rotary connecting piece; and when the pawl abuts against the tooth on the ratchet, the rotary connecting piece extends along a length direction of the front connecting rod, the ratchet, the pawl, the unlocking handle, the elastic piece, the right end of the left front connecting rod and the left end of the right front connecting rod are all located in the rotary connecting piece, the unlocking handle is located between the ratchet and the right front connecting rod, and the tooth on the ratchet is located at a rear right part of the ratchet.

Preferably, in the unlocking device for the foldable chair, the elastic piece is a spring.

Preferably, in the unlocking device for the foldable chair, the left front connecting rod and the right front connecting rod are coaxially arranged.

Preferably, in the unlocking device for the foldable chair, a front side of the rotary connecting piece is provided with one limiting rod, and when the pawl contacts with the limiting rod, the pawl is engaged with the tooth on the ratchet.

A foldable chair with an unlocking device comprises:

• • a chair seat;
  • a foldable chair frame, wherein the chair seat is arranged on the foldable chair frame, and the foldable chair frame comprises:
  • a rear supporting pedestal;
  • two front supporting pedestals which comprise a left front supporting pedestal and a right front supporting pedestal, wherein the left front supporting pedestal and the right front supporting pedestal are symmetrically arranged in front of the rear supporting pedestal;
  • two side connecting rods which comprise a left side connecting rod and a right side connecting rod, wherein two ends of the left side connecting rod are rotationally connected with the rear supporting pedestal and the left front supporting pedestal respectively, and two ends of the right side connecting rod are rotationally connected with the rear supporting pedestal and the right front supporting pedestal respectively;
  • a front connecting rod, which comprises a left front connecting rod and a right front connecting rod, wherein a left end of the left front connecting rod is rotationally connected with the left front supporting pedestal, and a right end of the right front connecting rod is rotationally connected with the right front supporting pedestal;
  • a rotary connecting piece, a right end of which is fixedly connected with a left end of the right front connecting rod, wherein a right end of the left front connecting rod abuts against or contacts with a left front side of the rotary connecting piece;
  • a ratchet which is rotationally connected with a left end of the rotary connecting piece, wherein only a part of a periphery of the ratchet is provided with a tooth, and the ratchet is fixedly connected with a right end of the left front connecting rod;
  • an elastic piece, one end of which is connected with the rotary connecting piece and abuts against the rotary connecting piece; and
  • an unlocking handle, one end of which is rotatably connected with the rotary connecting piece, and is provided with a pawl engaged with the tooth on the ratchet thereon, wherein the other end of the elastic piece abuts against the other end of the unlocking handle, and drives the pawl to abut against the tooth on the ratchet and restricts the ratchet from rotating counterclockwise; and when the other end of the unlocking handle is pressed, the pawl is separated from the tooth on the ratchet, and the ratchet rotates counterclockwise.

Preferably, in the foldable chair with the unlocking device, an inside of the rotary connecting piece is hollow, and left, right and front sides of the rotary connecting piece are all open, left ends of the ratchet and the unlocking handle are rotatably connected with a top of the rotary connecting piece and a bottom of the rotary connecting piece through a first axis and a second axis respectively, and a left end of the right front connecting rod is fixedly connected with the top of the rotary connecting piece and the bottom of the rotary connecting piece; when the pawl abuts against the tooth on the ratchet, the rotary connecting piece extends along a length direction of the front connecting rod, the ratchet, the pawl, the unlocking handle, the elastic piece, the right end of the left front connecting rod and the left end of the right front connecting rod are all located in the rotary connecting piece, the unlocking handle is located between the ratchet and the right front connecting rod, and the tooth on the ratchet is located at a rear right part of the ratchet.

Preferably, in the foldable chair with the unlocking device, the elastic piece is a spring.

Preferably, in the foldable chair with the unlocking device, the left front connecting rod and the right front connecting rod are coaxially arranged.

Preferably, in the foldable chair with the unlocking device, a front side of the rotary connecting piece is provided with one limiting rod, and when the pawl contacts with the limiting rod, the pawl is engaged with the tooth on the ratchet.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front schematic three-dimensional structural diagram of a foldable chair frame according to one embodiment of the present disclosure;

FIG. 2 is a side view of the foldable chair frame according to one embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of the foldable chair frame in an unfolded state according to one embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of the foldable chair frame in a folding process according to one embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of the foldable chair frame in a folded state according to one embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of an unlocking device according to one embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a foldable chair according to one embodiment of the present disclosure; and

FIG. 8 is a schematic three-dimensional structural diagram of the unlocking device according to one embodiment of the present disclosure.

DESCRIPTION OF THE EMBODIMENTS

The present disclosure will be further described in detail hereinafter with reference to the drawings and embodiments, so that those skilled in the art can implement the present disclosure with reference to the specification.

It should be noted that, in the description of the present disclosure, the orientations or positional relationships indicated by the terms such as “transverse”, “longitudinal”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like, refer to the orientations or positional relationships shown in the drawings, which are only intended to facilitate describing the present disclosure and simplifying the description, and do not indicate or imply that the indicated devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure.

As shown in FIG. 1 to FIG. 8, the present disclosure provides an unlocking device for a foldable chair, wherein a chair frame of the foldable chair comprises a front connecting rod 14, and the front connecting rod 14 comprises a left front connecting rod 141 and a right front connecting rod 142. As shown in FIG. 3 to FIG. 6, the left front connecting rod 141 is located on a left side and the right front connecting rod 142 is located on a right side. The unlocking device comprises a rotary connecting piece 15, a ratchet 16, an elastic piece 17, and an unlocking handle 18.

The rotary connecting piece 15 has a right end fixedly connected with a left end of the right front connecting rod 142, wherein a right end of the left front connecting rod 141 abuts against or contacts with a left front side of the rotary connecting piece 15.

The ratchet 16 is rotationally connected with a left end of the rotary connecting piece 15, wherein only a part of a periphery of the ratchet 16 is provided with a tooth, and the ratchet 16 is fixedly connected with a right end of the left front connecting rod 141.

The elastic piece 17 has one end connected with the rotary connecting piece 15 and abuts against the rotary connecting piece.

The unlocking handle 18 has one end rotatably connected with the rotary connecting piece 15, wherein one end of the unlocking handle 18 can rotate in a horizontal direction and is provided with a pawl 19 engaged with the tooth on the ratchet 16 thereon, wherein the other end of the elastic piece 17 abuts against the other end of the unlocking handle 18, and drives the pawl 19 to abut against the tooth 161 on the ratchet 16 and restricts the ratchet 16 from rotating counterclockwise; and when the other end of the unlocking handle 18 is pressed, the pawl 19 rotates counterclockwise, so as to be separated from the tooth 161 on the ratchet, and the ratchet 16 can rotate counterclockwise. When the unlocking handle 18 is pressed to rotate the pawl 19, the ratchet 16 and the tooth thereon do not interfere with the rotation of the pawl 19.

According to the unlocking device for the foldable chair provided by the solution, one ratchet 16 with no teeth and the pawl 19 are used to form a mechanism which enables the ratchet 16 to rotate in one direction (clockwise) and is restricted in the other direction (counterclockwise).

When the unlocking handle 18 is pressed to make the pawl 19 rotate counterclockwise for a certain angle, the pawl 19 is separated from a restricted area of the ratchet 16, and the ratchet 16 can rotate counterclockwise without the restriction of the pawl 19 in this case. When the left front connecting rod 141 is in contact with an inner surface (left front side) of the rotary connecting piece 15, the clockwise movement of the left front connecting rod 141 is restricted, so that the clockwise movement of the ratchet 16 is also restricted.

In another solution, in the unlocking device for the foldable chair, an inside of the rotary connecting piece 15 is hollow, and left, right and front sides of the rotary connecting piece are all open, and left ends of the ratchet 16 and the unlocking handle 18 are rotatably connected with a top 151 of the rotary connecting piece 15 and a bottom 152 of the rotary connecting piece 15 through a first axis 162 and a second axis 181 respectively. A right end of the unlocking handle 18 abuts against the elastic piece 17, and a left end of the right front connecting rod 142 is fixedly connected with the top 151 and the bottom 152 of the rotary connecting piece 15. A right end of the left front connecting rod 141 passes through a left side of the rotary connecting piece 15 and is fixedly connected with the ratchet 16. A left end of the right front connecting rod 142 passes through a right side of the rotary connecting piece 15 and is fixedly connected with a right end of the rotary connecting piece 15. When the pawl 19 abuts against the tooth 161 on the ratchet, the rotary connecting piece 15 extends along a length direction of the front connecting rod 14, the ratchet 16, the pawl 19, the unlocking handle 18, the elastic piece 17, the right end of the left front connecting rod 141 and the left end of the right front connecting rod 142 are all located in the rotary connecting piece 15, the unlocking handle 18 is located between the ratchet 16 and the right front connecting rod 142, and the tooth 161 on the ratchet is located at a rear right part of the ratchet 16.

In another solution, in the unlocking device for the foldable chair, the elastic piece 17 is a spring.

In another solution, in the unlocking device for the foldable chair, the left front connecting rod 141 and the right front connecting rod 142 are coaxially arranged.

In another solution, in the unlocking device for the foldable chair, a front side of the rotary connecting piece 15 is provided with one limiting rod 20, and when the pawl 19 contacts with the limiting rod 20, the pawl 19 is engaged with the tooth 161 on the ratchet. The limiting rod 20 does not interfere with the rotation of the ratchet 16.

A foldable chair with an unlocking device comprises a chair seat 2 and a foldable chair frame 1.

The chair seat 2 is arranged in the same way as that in the existing patent publication of CN220141181U.

The foldable chair frame 1 comprises a rear supporting pedestal 11, two front supporting pedestals 12, two side connecting rods 13, a front connecting rod 14, a rotary connecting piece 15, a ratchet 16, an elastic piece 17, and an unlocking handle 18.

The rear supporting pedestal 11 is detachably connected with two upper supporting rods and two lower foot rods thereon.

The two front supporting pedestals 12, which comprise a left front supporting pedestal 121 and a right front supporting pedestal 122, as shown in FIG. 3 to FIG. 5, the left front supporting pedestal 121 is located in a left side, the right front supporting pedestal 122 is located in a right side, the left front supporting pedestal 121 and the right front supporting pedestal 122 are symmetrically arranged in front of the rear supporting pedestal 11, the two front supporting pedestals 12 are detachably connected with an upper supporting rod and a lower foot rod respectively, and the chair seat 2 is detachably mounted on the rear supporting pedestal 11 and the upper supporting rods of the two front supporting pedestals 12.

The two side connecting rods 13, which comprise a left side connecting rod 131 and a right side connecting rod 132, as shown in FIG. 3 to FIG. 5, the left side connecting rod 131 is located on the left side and the right side connecting rod 132 is located on the right side, two ends of the left side connecting rod 131 are r rotationally connected with the rear supporting pedestal 11 and the left front supporting pedestal 121 respectively, and two ends of the right side connecting rod 132 are rotationally connected with the rear supporting pedestal 11 and the right front supporting pedestal 122 respectively.

The front connecting rod 14 comprises a left front connecting rod 141 and a right front connecting rod 142, wherein a left end of the left front connecting rod 141 is rotationally connected with the left front left front supporting pedestal 121, the left end of the left front connecting rod 141 rotates around a second rotating center, a right end of the right front connecting rod 142 is rotationally connected with the right front supporting pedestal 122, and the right end of the right front connecting rod 142 rotates around a third rotating center.

The rotary connecting piece 15 has a right end fixedly connected with a left end of the right front connecting rod 142, wherein a right end of the left front connecting rod 141 abuts against or contacts with a left front side of the rotary connecting piece.

The ratchet 16 is rotationally connected with a left end of the rotary connecting piece 15, wherein the ratchet 16 can rotate in a horizontal direction around a first rotating center, and only a part of a periphery of the ratchet 16 is provided with a tooth, and the ratchet 16 is fixedly connected with a right end of the left front connecting rod 141.

The elastic piece 17 has one end connected with the rotary connecting piece 15 and abuts against the rotary connecting piece.

The unlocking handle 18 has one end rotatably connected with the rotary connecting piece 15, wherein one end of the unlocking handle 18 can rotate in a horizontal direction and is provided with a pawl 19 engaged with the tooth 161 on the ratchet 16 thereon, wherein the other end of the elastic piece 17 abuts against the other end of the unlocking handle 18, and drives the pawl 19 to abut against the tooth 161 on the ratchet 16 and restricts the ratchet 16 from rotating counterclockwise; and when the other end of the unlocking handle 18 is pressed, the pawl 19 rotates counterclockwise, so as to be separated from the tooth 161 on the ratchet 16, and the ratchet 16 can rotate counterclockwise. When the unlocking handle 18 is pressed to rotate the pawl 19, the ratchet 16 and the tooth thereon do not interfere with the rotation of the pawl 19.

The foldable chair provided by this solution is provided with one rear supporting pedestal 11, one left front supporting pedestal 121 and one right front supporting pedestal 122. The left front supporting pedestal 121 and the right front supporting pedestal 122 are connected to the rear supporting pedestal 11 by rivets (axes) with the left side connecting rod 131 and the right side connecting rod 132 respectively. Both the left side connecting rod 131 and the right side connecting rod 132 can rotate around the rivets (axes) relative to the rear supporting pedestal 11. One left front connecting rod 141 is connected to the left front supporting pedestal 121 through a rivet (axis), and the left front connecting rod 141 can rotate relative to the left front supporting pedestal 121. The ratchet 16 lacking teeth is connected and fixed on the left front connecting rod 141 through an elastic pin, and the ratchet 16 lacking teeth cannot move relative to the left front connecting rod 141. One right front connecting rod 142 is connected to the right front supporting pedestal 122 through a rivet (axis), and the right front connecting rod 142 rotates relative to the right front supporting pedestal 122. One rotary connecting piece 15 is fixed at the other end of the right front connecting rod 142 through two rivets, and the rotary connecting piece 15 cannot move relative to the right front connecting rod 142. The ratchet 16 lacking teeth is connected with the rotary connecting piece 15 through a rivet (axis), and the ratchet 16 lacking teeth can rotate relative to the rotary connecting piece 15. The pawl 19 and the unlocking handle 18 are made into a whole by means of rubber coating to form an unlocking assembly. The unlocking assembly is connected with the rotary connecting piece 15 through a rivet (axis), and the unlocking assembly can rotate relative to the rotary connecting piece 15. There is one pressure spring on a back of the unlocking handle 18 on the unlocking assembly, and the other end of the pressure spring presses an inner surface of the rotary connecting piece 15. Because the pressure spring presses the unlocking handle 18, the unlocking assembly tends to move clockwise, and the remaining teeth of the ratchet 16 lacking teeth are engaged with the teeth of the pawl 19 when the foldable chair supporting frame is unfolded. In this case, the counterclockwise movement of the ratchet 16 lacking teeth is limited by the pawl 19, so the ratchet 16 lacking teeth cannot move counterclockwise. In this case, the left front connecting rod 141 is in contact with an inner surface (left front side) of the rotary connecting piece 15, so that the counterclockwise movement of the left front connecting rod 141 relative to the left front supporting pedestal 121 is restricted, so the left front connecting rod 141 cannot move counterclockwise in this case, and finally the left front connecting rod 141 and the right front connecting rod 142 are coaxial, and the six degrees of freedom of the left front connecting rod 141 and the right front connecting rod 142 are restricted, so that a front connecting rod 14 formed by the left side connecting rod 131 and the right side connecting rod 132 as well as the left front connecting rod 141 and the right front connecting rod 142 coaxially forms a stable triangle structure, such that the stability of the chair is greatly improved.

When the chair needs to be stored, it is only necessary to press the unlocking handle 18 to drive the unlocking assembly to move counterclockwise, so that the pawl 19 is separated from an area that restricts the ratchet 16 lacking teeth from moving counterclockwise, and finally the ratchet 16 lacking teeth can move counterclockwise. In this case, the rotary connecting piece 15 is gently pushed towards the rear supporting pedestal 11. Because the teeth of the ratchet 16 lacking teeth are missing, as long as the ratchet 16 lacking teeth rotates for a certain angle, even if the unlocking handle 18 is no longer pressed, after the unlocking handle 18 is reset, the pawl 19 can no longer engage with the ratchet 16 lacking teeth, so that the counterclockwise movement of the ratchet 16 lacking teeth is no longer restricted, and an effect of storing the chair is achieved.

When the chair needs to be unfolded and assembled, first, left and right hands respectively grasp the left front supporting pedestal 121 and the right front supporting pedestal 122 respectively, so that the left front supporting pedestal 121 and the right front supporting pedestal 122 are opened to the left and right respectively for a certain angle, then one hand grasps the left front supporting pedestal 121 or the right front supporting pedestal 122, and the other hand grasps the rotary connecting piece 15 to pull forward. In this case, the ratchet 16 lacking teeth moves clockwise. The clockwise movement of the ratchet 16 lacking teeth is not limited by the pawl 19 until the left front connecting rod 141 contacts the inner surface (left front side) of the rotary connecting rod 15. This is because if the ratchet 16 still moves clockwise around the first rotating center thereof after the left front connecting rod 141 contacts the left front side of the rotary connecting rod 15, the left end of the left front connecting rod 141 needs to move clockwise around the second rotating center thereof. At the same time, the right end of the right front connecting rod 142 needs to move counterclockwise around the third rotating center. However, in this case, the left front connecting rod 141 is already in contact with the left front side of the rotary connecting piece 15. When the right front connecting rod 142 moves counterclockwise around the third rotating center, a contact point between the left front connecting rod 141 and the rotary connecting piece 15 needs to move forward, but the existence of the left front connecting rod 141 restricts the forward movement of the contact point between the two, so the ratchet 16 cannot continue to move clockwise in this case. The clockwise movement of the left front connecting rod 141 is restricted, so that the clockwise movement of the ratchet 16 lacking teeth is restricted at the same time. In this case, the remaining teeth of the ratchet 16 lacking teeth are engaged with the pawl 19, so that the counterclockwise movement of the ratchet 16 lacking teeth is restricted at the same time. A final result is that the six degrees of freedom of the left front connecting rod 141 and the right front connecting rod 142 are restricted, so that a front connecting rod 14 formed by the left side connecting rod 131 and the right side connecting rod 132 as well as the left front connecting rod 141 and the right front connecting rod 142 coaxially forms a stable triangle structure, thus achieving the object of unfolding the chair.

In another solution, in the foldable chair with the unlocking device, an inside of the rotary connecting piece 15 is hollow, and left, right and front sides of the rotary connecting piece 15 are all open, and left ends of the ratchet 16 and the unlocking handle 18 are rotatably connected with a top 151 of the rotary connecting piece 15 and a bottom 152 of the rotary connecting piece 15 through a first axis 162 and a second axis 181 respectively. A right end of the unlocking handle 18 abuts against the elastic piece 17, and a left end of the right front connecting rod 142 is fixedly connected with the top 151 of the rotary connecting piece 15 and the bottom 152 of the rotary connecting piece 15. A right end of the left front connecting rod 141 passes through a left side of the rotary connecting piece 15 and is fixedly connected with the ratchet 16. A left end of the right front connecting rod 142 passes through a right side of the rotary connecting piece 15 and is fixedly connected with a right end of the rotary connecting piece 15. When the pawl 19 abuts against the tooth 161 on the ratchet 16, the rotary connecting piece 15 extends along a length direction of the front connecting rod 14, the ratchet 16, the pawl 19, the unlocking handle 18, the elastic piece 17, the right end of the left front connecting rod 141 and the left end of the right front connecting rod 142 are all located in the rotary connecting piece 15, the unlocking handle 18 is located between the ratchet 16 and the right front connecting rod 142, and the tooth 161 on the ratchet 16 is located at a rear right part of the ratchet 16.

In another solution, in the foldable chair with the unlocking device, the elastic piece is a spring.

In another solution, in the foldable chair with the unlocking device, the left front connecting rod 141 and the right front connecting rod 142 are coaxially arranged.

In another solution, in the foldable chair with the unlocking device, a front side of the rotary connecting piece 15 is provided with one limiting rod 20, and when the pawl 19 contacts with the limiting rod 20, the pawl 19 is engaged with the tooth 161 on the ratchet 16. The limiting rod 20 does not interfere with the rotation of the ratchet 16. When the foldable chair is in an unfolded state, the pawl 19 tends to move clockwise under the action of the spring, and the limiting rod 20 can limit the pawl 19 from moving clockwise.

By designing a ratchet-pawl mechanism, a problem that a great effort is needed during assembly and storage of the foldable chair can be solved.

The present disclosure at least includes the following beneficial effects.

After the portable foldable chair supporting frame of the present disclosure is opened, the tooth on the ratchet and the pawl will be automatically engaged when the rotary connecting piece is pulled forward, so that six degrees of freedom of the left front connecting rod and the right front connecting rod are limited. In this case, the foldable chair supporting frame forms a stable triangular structure and cannot be folded, thus avoiding an accidental folding phenomenon of the foldable chair in use, thus having the advantages of good stability, high safety and the like.

In an unfolded state of the foldable chair supporting frame of the present disclosure, the left front connecting rod and the right front connecting rod are in the same straight line and level with the rotary connecting piece. Therefore, when the rotary connecting piece needs to be unlocked for storage, the rotary connecting rod can be pushed to drive the left front connecting rod and the right front connecting rod to be retracted in the direction of the rear supporting seat only by gently pressing the unlocking handle, so that the foldable chair supporting frame has the advantages of easy and convenient operation, labor saving and the like.

Although the implementation of the present disclosure has been disclosed above, it is not limited to the applications listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present disclosure, and additional modifications can be easily implemented by those skilled in the art. Therefore, the present disclosure is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and the equivalent scope.