FIXING STRUCTURE FOR CUSHION LAYER OF SOFA BED AND SOFA BED

Abstract

A fixing structure for a cushion layer of a sofa bed is provided. The sofa bed includes a left armrest, a right armrest, and a bed frame. A position of the bed frame is fixedly located between the left armrest and the right armrest, and the bed frame is disposed with an elastic layer and a cushion layer in sequence. The elastic layer includes a plurality of first connecting members spaced apart from each other in a circumferential direction of the elastic layer. A lower surface of the cushion layer includes a plurality of second connecting members spaced apart from each other in a circumferential direction of the cushion layer, and the plurality of first connecting members are connected to the plurality of second connecting members through one or more intermediate connecting members.

Claims

1. A fixing structure for a cushion layer of a sofa bed, wherein: the sofa bed comprises a left armrest, a right armrest, and a bed frame, a position of the bed frame is fixedly located between the left armrest and the right armrest, the bed frame is disposed with an elastic layer and a cushion layer in sequence, the elastic layer comprises a plurality of first connecting members spaced apart from each other in a circumferential direction of the elastic layer, a lower surface of the cushion layer comprises a plurality of second connecting members spaced apart from each other in a circumferential direction of the cushion layer, and the plurality of first connecting members are connected to the plurality of second connecting members through one or more intermediate connecting members.

2. The fixing structure for the cushion layer of the sofa bed according to claim 1, wherein: the plurality of first connecting members and the plurality of second connecting members are insertion slots, and the one or more intermediate connecting members are respectively connected to the plurality of first connecting members and the plurality of second connecting members.

3. The fixing structure for the cushion layer of the sofa bed according to claim 2, wherein: each of the one or more intermediate connecting members comprises a connecting belt and two insertion blocks disposed at two ends of the connecting belt.

4. The fixing structure for the cushion layer of the sofa bed according to claim 1, wherein: the elastic layer comprises a plurality of elastic units arranged in an array arrangement, each of the plurality of elastic units is disposed with a corresponding set of the plurality of first connecting members respectively located on two first sides of a corresponding one of the plurality of elastic units in a transverse direction of the array arrangement and two second sides of the corresponding one of the plurality of elastic units in a longitudinal direction of the array arrangement, and adjacent two first connecting members that respectively belong to adjacent two elastic units of the plurality of elastic units are connected by a corresponding one of the one or more intermediate connecting members.

5. A sofa bed, comprising: a structural frame, a cushion layer, and an elastic layer, wherein: the cushion layer is connected to the elastic layer through the fixing structure according to claim 1.

6. The sofa bed according to claim 5, wherein: the structural frame comprises the left armrest, the right armrest, the bed frame, and a bed board, the bed frame comprises a first bed frame and a second bed frame arranged in sequences along a width direction of the left armrest and the right armrest, the first bed frame is fixedly connected to and located between the left armrest and the right armrest, the second bed frame is rotatably connected to and located between the left armrest and the right armrest, and the bed board is respectively connected to the first bed frame and the second bed frame.

7. The sofa bed according to claim 6, wherein: the second bed frame is configured to be in a first position and a second position relative to the first bed frame, when the second bed frame is in the first position, an angle between the first bed frame and the second bed frame is 180, and when the second bed frame is in the second position, the angle between the first bed frame and the second bed frame is less than 180.

8. The sofa bed according to claim 6, wherein: each of the left armrest and the right armrest is disposed with a folding hinge to enable the left armrest and the right armrest to be rotatably connected to the second bed frame, the folding hinge comprises a first supporting arm and a second supporting arm, a first end of the first supporting arm and a first end of the second supporting arm are pivotally connected to each other, a second end of the first supporting arm is fixedly connected to a corresponding one of the left armrest or the right armrest, and a second end of the second supporting arm is fixedly connected to the second bed frame.

9. The sofa bed according to claim 6, wherein: the left armrest and the right armrest are fixedly connected by a lateral rod.

10. The sofa bed according to claim 9, wherein: the lateral rod comprises one or more position-provided recesses, and when the second bed frame is in a first position, one or more parts of the second bed frame that abut the lateral rod are disposed in the one or more position-provided recesses.

11. The sofa bed according to claim 6, wherein: the first bed frame comprises a plurality of first insertion holes located on two first side frames of the first bed frame along a length direction of the sofa bed, the second bed frame comprises a plurality of second insertion holes located on two second side frames of the second bed frame along the length direction of the sofa bed, and the plurality of first insertion holes and the plurality of second insertion holes are configured to fix the bed board.

12. The sofa bed according to claim 11, wherein: a first side frame of the first bed frame and a first side frame of the second bed frame facing away from each other respectively comprises a first inner surface and a second inner surface on which a first set of the plurality of first insertion holes and a first set of the plurality of second insertion holes are respectively located at intervals, and a second side frame of the first bed frame and a second side frame of the second bed frame facing each other respectively comprises a first upper surface and a second upper surface on which a second set of plurality of first insertion holes and a second set of the plurality of second insertion holes are respectively located at intervals.

13. The sofa bed according to claim 12, wherein: the bed board comprises a plurality of grid-shaped bed board units, a first side of each of the plurality of grid-shaped bed board units comprises a plurality of first insertion pins extending along a horizontal direction, and a second side of each of the plurality of grid-shaped bed board units comprises a plurality of second insertion pins extending along a height direction.

14. The sofa bed according to claim 6, wherein: a surface of the bed board is disposed with a plurality of fixing members spaced apart from each other and configured to be connected to the elastic layer.

15. The sofa bed according to claim 14, wherein: the plurality of fixing members are I-shaped protrusions extending in a height direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a perspective view of Embodiment 1 of the present disclosure.

[0023] FIG. 2 is an exploded view of Embodiment 1 of the present disclosure.

[0024] FIGS. 3-12 illustrate an assembly process of a sofa bed in Embodiment 1 of the present disclosure.

[0025] FIGS. 13-14 show schematic diagrams of backrest angle adjustment in Embodiment 1 of the present disclosure.

[0026] FIG. 15 is a schematic view of an elastic unit in Embodiment 1 of the present disclosure.

[0027] FIG. 16 shows the elastic unit of Embodiment 1 from another angle.

[0028] FIGS. 17-18 are schematic diagrams of the elastic units connected in an array in Embodiment 1 of the present disclosure.

[0029] FIG. 19 is a schematic view of an elastic unit in Embodiment 2 of the present disclosure.

[0030] FIG. 20 shows the elastic unit of Embodiment 2 from another angle.

[0031] FIGS. 21-23 are schematic diagrams of the elastic units connected in an array in Embodiment 2 of the present disclosure.

[0032] FIG. 24 is a schematic view of an elastic unit in Embodiment 3 of the present disclosure.

[0033] FIG. 25 shows the elastic unit of Embodiment 3 from another angle.

[0034] FIGS. 26-28 are schematic diagrams of the elastic units connected in an array in Embodiment 3 of the present disclosure.

[0035] FIG. 29 is a schematic view of an elastic unit in Embodiment 4 of the present disclosure.

[0036] FIG. 30 shows the elastic unit of Embodiment 4 from another angle.

[0037] FIGS. 31-34 are schematic diagrams of the elastic units connected in an array in Embodiment 4 of the present disclosure.

[0038] FIGS. 35-36 are partial enlarged views of FIGS. 32 and 33.

[0039] FIG. 37 is a schematic view of an elastic unit in Embodiment 5 of the present disclosure.

[0040] FIG. 38 shows the elastic unit of Embodiment 5 from another angle.

[0041] FIGS. 39-41 are schematic diagrams of the elastic units connected in an array in Embodiment 5 of the present disclosure.

[0042] FIG. 42 is a schematic view of an elastic unit in Embodiment 6 of the present disclosure.

[0043] FIG. 43 shows the elastic unit of Embodiment 6 from another angle.

[0044] FIGS. 44-47 are schematic diagrams of the elastic units connected in an array in Embodiment 6 of the present disclosure.

[0045] FIG. 48 is an enlarged view of the elastic units when connected in Embodiment 6 of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The technical solutions of the embodiments of the present disclosure will be described in detail below with reference to the drawings. It should be understood that the embodiments described are only part of the embodiments of the present disclosure, and not all possible embodiments. All other embodiments that would be apparent to a person skilled in the art based on the teachings of the present disclosure, without requiring any inventive step, are within the scope of the present disclosure's protection.

[0047] In the description of the present disclosure, it should be noted that terms such as upper, lower, inner, outer, top, bottom, and the like, refer to positions or positional relationships based on the orientations shown in the drawings. These terms are used for convenience in describing the present disclosure and simplifying the description, and should not be interpreted as limiting the present disclosure. The device or element in question does not necessarily have to be constructed or operated in a specific orientation or position. Additionally, the terms first, second, and similar terms are used for descriptive purposes only and do not imply any relative importance or ranking.

[0048] In the description of the present disclosure, unless otherwise clearly stated or limited, terms such as installed, provided with, mounted/connected, connected, etc., should be understood in their broadest sense. For example, connection can refer to a wall-mounted connection, a detachable connection, or an integral connection. It may refer to a mechanical or electrical connection, direct or indirect connection, or an internal connection between components. The specific meaning of these terms will be understood by those skilled in the art based on the particular context of the disclosure.

Embodiment 1

[0049] Referring to FIGS. 1 to 18, this embodiment provides a foldable sofa bed. A backrest portion of the sofa bed can be laid flat so that the backrest portion and a seat cushion can be combined to form a flat bed, and the backrest portion can form an angle less than 180 with the seat cushion to achieve a function of a normal sofa.

[0050] To this end, the sofa bed comprises a structural frame, a cushion layer 1, and an elastic layer 2. The structural frame is used to support the elastic layer 2 and the cushion layer 1.

[0051] Specifically, the structural frame comprises a left armrest 3, a right armrest 4, a bed frame, and a bed board. The bed frame comprises a first bed frame 5 and a second bed frame 6 arranged in sequence along a width direction of the left armrest 3 and the right armrest 4. The first bed frame 5 is fixedly connected to the left armrest 3 and the right armrest 4, and the second bed frame 6 is rotatably connected to the left armrest 3 and the right armrest 4. The bed board is respectively connected to the first bed frame 5 and the second bed frame 6.

[0052] After the above settings, the first bed frame 5 is fixedly connected to the left armrest 3 and the right armrest 4, and the first bed frame 5 is correspondingly used to as a first supporting frame of the seat cushion. The second bed frame 6 can be rotated relative to the left armrest 3 and the right armrest 4, thereby changing an angle relative to the first bed frame 5, and the second bed frame 6 is correspondingly used as a second supporting frame of the backrest portion.

[0053] By limiting a rotation range of the second bed frame 6, the second bed frame 6 is configured to be in a first position and a second position relative to the first bed frame 5. When the second bed frame 6 is in the first position, the angle between the first bed frame 5 and the second bed frame 6 is 180. When the second bed frame 6 is in the second position, the angle between the first bed frame 5 and the second bed frame 6 is less than 180.

[0054] In this embodiment, to achieve a rotating connection of the second bed frame 6 relative to the left armrest 3 and the right armrest 4, each of the left armrest 3 and the right armrest 4 is disposed with a folding hinge 7 to enable the left armrest 3 and the right armrest 4 to be rotatably connected to the second bed frame 6. The folding hinge 7 comprises a first supporting arm 71 and a second supporting arm 72. A first end of the first supporting arm 71 and a first end of the second supporting arm 72 are pivotally connected to each other. A second end of the first supporting arm 71 is fixedly connected to a corresponding one of the left armrest 3 or the right armrest 4, and a second end of the second supporting arm 72 is fixedly connected to the second bed frame 6.

[0055] In this embodiment, the second bed frame 6 needs to be locked in the second position to achieve the function of the normal sofa. To this end, a locking mechanism is provided. The locking mechanism is configured to lock the first bed frame 5 and the second bed frame 6 in one or more relative positions. Specifically, the locking mechanism comprises a ratchet 73 mounted on one of the first supporting arm 71 or the second supporting arm 72, and a pawl 74 mounted on the other one of the first supporting arm 71 or the second supporting arm 72. The ratchet 73 has ratchet teeth arranged circumferentially, and the pawl 74 is configured to engage one of the ratchet teeth to lock the second bed frame 6 at its current position.

[0056] To achieve multi-position adjustment of an angle of the backrest portion, a number of ratchet teeth can be increased, so that when the pawl 74 is engaged with different ratchet teeth, a position of the second bed frame 6 can be changed, thereby achieving the multi-position adjustment of the angle of the backrest portion.

[0057] In order to increase stability of the structural frame, the left armrest 3 and the right armrest 4 are fixedly connected by a lateral rod 8. The lateral rod 8 is arranged on a side of the left armrest 3 and the right armrest 4 adjacent to the backrest portion. A supporting leg 81 extends downward from a middle of the lateral rod 8 along a height direction, and the supporting leg 81 abuts ground to provide an additional supporting point.

[0058] Since the second bed frame 6 and the first bed frame 5 are in a coplanar configuration when the second bed frame 6 is in the first position, the lateral rod 8 is configured to avoid interference with a rotation of the second bed frame 6. To this end, the lateral rod 8 comprises one or more position-provided recesses 82. When the second bed frame 6 is in the first position, one or more parts of the second bed frame 6 that abut the lateral rod 8 are disposed in the one or more position-provided recesses 82, thereby avoiding interference between the lateral rod 8 and the second bed frame 6.

[0059] In this embodiment, each of the second bed frame 6 and the first bed frame 5 is formed by connecting two rectangular frames along a length direction of the foldable sofa bed. Therefore, the second bed frame 6 includes a longitudinal beam 61 in a middle of the second bed frame 6, in addition to all sides of a rectangular frame of the second bed frame 6. Therefore, the one or more position-provided recesses 82 are three position-provided recesses 82, and the three position-provided recesses 82 correspond to two sides of the rectangular frame of the second bed frame 6 and the longitudinal beam 61.

[0060] Since the first bed frame 5 and the second bed frame 6 are merely frames and cannot support the elastic layer 2 and the cushion layer 1, the bed board needs to be mounted on the first bed frame 5 and the second bed frame 6. In order to mount the bed board, the first bed frame 5 comprises a plurality of first insertion holes 51 located on two first side frames of the first bed frame 5 along the length direction of the foldable sofa bed, and the second bed frame 6 comprises a plurality of second insertion holes 62 located on two second side frames of the second bed frame 6 along the length direction of the foldable sofa. The plurality of first insertion holes 51 and the plurality of second insertion holes 62 are configured to fix the bed board.

[0061] To ensure stability of the bed board, positions of each of the plurality of first insertion holes 51 and the plurality of second insertion holes 62 are different, so that a position of the bed board can be inhibited from moving in the height direction and in a horizontal direction, thereby ensuring the stability of the bed board. Specifically, a side frame of the first bed frame 5 and a side frame of the second bed frame 6 facing away from each other respectively comprises a first inner surface and a second inner surface on which a first set of the plurality of first insertion holes 51 and a first set of the plurality of second insertion holes 62 are respectively located at intervals. A side frame of the first bed frame 5 and a side frame of the second bed frame 6 facing each other respectively comprises a first upper surface and a second upper surface on which a second set of the plurality of first insertion holes 51 and a second set of the plurality of second insertion holes 62 are respectively located at intervals.

[0062] Correspondingly, the bed board comprises a plurality of grid-shaped bed board units 9. A first side of each of the plurality of grid-shaped bed board units 9 comprises a plurality of first insertion pins 91a extending along the horizontal direction, and a second side of each of the plurality of grid-shaped bed board units 9 comprises a plurality of second insertion pins 91b extending along the height direction. By inserting the plurality of first insertion pins 91a and the plurality of second insertion pins 91b extending in different directions into the plurality of first insertion holes 51 and the plurality of second insertion holes 62 extending in different directions, the bed board can be stably fixed on the first bed frame 5 and the second bed frame 6.

[0063] A function of the bed board is to support the elastic layer 2. To this end, surfaces of the plurality of grid-shaped bed board units 9 comprise a plurality of fixing members 92 arranged at intervals for fixing the elastic layer 2. The elastic layer 2 comprises a plurality of elastic units 21 arranged in an array, and a bottom of each of the plurality of elastic units 21 comprises a fixing fitting member 210, which can be matched with a corresponding one of the plurality of fixing members 92. In this embodiment, the plurality of fixing members 92 are I-shaped protrusions extending in the height direction. The fixing fitting member 210 is an I-shaped slot. By plugging the two together, the plurality of elastic units 21 and the plurality of grid-shaped bed board units 9 can be fixedly connected.

[0064] To enable the plurality of elastic units 21 to be connected together to form the elastic layer 2, and to enable the plurality of elastic units 21 to be quickly disassembled and assembled, which is convenient for enabling users to replace the plurality of elastic units 21, each of the plurality of elastic units 21 has four first connecting members 211 disposed in rotational symmetry about its own axis. Adjacent two first connecting members 211 respectively belonging to two sets of the four first connecting members 211 belonging to adjacent two elastic units of the plurality of elastic units 21 are connected by an intermediate connecting member 213, and the intermediate connecting member 213 enables the adjacent two first connecting members 211 of the adjacent two elastic units to be connected together.

[0065] In this embodiment, the intermediate connecting member 213 is in an inserting connection with the adjacent two first connecting members 211 of the two sets of the four first connecting members 211. The four first connecting members 211 are insertion slots, and the intermediate connecting member 213 comprises a connecting belt 2133 and two insertion blocks 2134 disposed at two ends of the connecting belt 2133.

[0066] The advantage of providing the intermediate connecting member 213 is that the cushion layer 1 and the elastic layer 2 can be connected together through the intermediate connecting member 213 to avoid relative movement between the cushion layer 1 and the elastic layer 2. Therefore, a lower surface of the cushion layer 1 comprises a plurality of second insertion slots 11 arranged along a circumferential direction of the cushion layer 1 and spaced apart from each other, and the plurality of second insertion slots 11 and the insertion slot on some of the plurality of elastic units 21 located on a periphery of the elastic layer 2 can be fixedly connected together through the intermediate connecting member 213.

Embodiment 2

[0067] Referring to FIGS. 19-23, to enable the plurality of elastic units 21 to be connected together to form the elastic layer 2, in this embodiment, each of the plurality of elastic units 21 has two first connecting members 211 and two second connecting members 212 disposed in rotational symmetry about its own axis. The two first connecting members 211 and the two second connecting members 212 are alternately arranged. In this way, the adjacent two elastic units 21 are connected through the two first connecting members 211 of one of the adjacent two elastic units 21 being connected to the two second connecting members 212 of the other one of the adjacent two elastic units 21.

[0068] In this embodiment, the two first connecting members 211 and the two second connecting member 212 are configured to be inserted into each other.

[0069] To achieve the above-mentioned insertion connection, the two first connecting members 211 are insertion blocks, and the two second connecting members 212 are insertion slots configured to be matched with the two first connecting members 211. To facilitate releasing of the insertion connection between the plurality of elastic units 21, a surface of each of the insertion blocks comprises an elastic arm 2111, and a surface of the elastic arm 2111 comprises a protrusion 2112. A side wall of each of the insertion slots comprises an opening 2121 configured to be interlocked with the protrusion 2112. When the elastic arm 2111 is in an initial position, the protrusion 2112 is disposed in the opening 2121 and is interlocked with the opening 2121 in a direction opposite to an insertion direction of the protrusion 2112. To release the insertion connection, the protrusion 2112 can be pressed to release an interlocking connection of the protrusion 2112 and the opening 2121, and the insertion connection between the insertion blocks and the insertion slots can be released.

Embodiment 3

[0070] Referring to FIGS. 24 to 28, the difference between this embodiment and Embodiment 2 is that structures of the two first connecting members 211 and the two second connecting members 212 are different. In this embodiment, the two first connecting members 211 and the two second connecting members 212 are also connected by inserting, but the difference is that two sides of each of the insertion blocks are respectively disposed with two elastic arms 2111, and sides of the two elastic arms 2111 facing away from a corresponding one of the insertion blocks respectively has two protrusions 2112. Two side walls of each of the insertion slots along a length direction of the insertion slots respectively comprises two openings 2121 configured to be interlocked with the two protrusions 2112. When the two elastic arms 2111 are in an initial position, the two protrusions 2112 are disposed in the two openings 2121 and are interlocked with the two openings 2121 in a direction opposite to an insertion direction of the insertion blocks.

[0071] When unlocking, a connection between the insertion blocks and the insertion slots can be released by pressing the two protrusions 2112 on the two sides of the insertion slots to release an interlocking connection between the two protrusions 2112 and the two openings 2121.

Embodiment 4

[0072] Referring to FIGS. 29 to 36, in this embodiment, the difference between this embodiment and Embodiment 2 is that, unlike the insertion connection in Embodiment 1, in this embodiment, the two first connecting members 211 and the two second connecting members 212 are insertion and rotatable structures. That is, in addition to being inserted into the two second connecting members 212, the two first connecting members 211 further need to be rotated relative to the two second connecting members 212 by a certain angle to enable the two first connecting members 211 and the two second connecting members 212 to form a fixed connection.

[0073] To this end, the two first connecting members 211 are rotatable blocks extending along the height direction, and the two second connecting members 212 are position-limiting grooves configured to be matched with the rotatable blocks. Each of the rotatable blocks has a first position and a second position relative to a corresponding one of the position-limiting grooves. When each of the rotatable blocks is in the first position, each of the rotatable blocks and the corresponding one of the position-limiting grooves are released from an interlocking connection in a direction opposite to a direction in which each of the rotatable blocks is inserted into the corresponding one of the position-limiting grooves. When each of the rotatable blocks is in the second position, each of the rotatable blocks and the corresponding one of the position-limiting grooves are interlocked with each other in the direction opposite to the direction in which each of the rotatable blocks is inserted into the corresponding one of the position-limiting grooves.

[0074] Specifically, the position-limiting grooves are strip-shaped grooves. A length of each of the rotatable blocks is less than a length of each of the position-limiting grooves and greater than a width of each of the position-limiting grooves. Surfaces of the two first connecting members 211 comprise operating members 2117 for driving the rotatable blocks to rotate.

[0075] During installation, each of the rotatable blocks can be firstly inserted into the corresponding one of the position-limiting grooves from top to bottom in the height direction. At this time, each of the rotatable blocks is located in the first position. Since the length of each of the rotatable blocks is less than the length of each of the position-limiting grooves, there is no interlocking connection between the rotatable block and the position-limiting grooves, and no fixed connection is formed between the two first connecting members 211 and the two second connecting members 212. Then, the rotatable blocks can be rotated to the second position through the operating members 2117. At this time, the rotatable blocks are rotated by 90. A length direction of each of the rotatable blocks corresponds to a width direction of the corresponding one of the position-limiting grooves. Since the length of each of the rotatable blocks is greater than the width of each of the position-limiting grooves, each of the rotatable blocks and the corresponding one of the position-limiting grooves are interlocked with each other in the direction opposite to the insertion direction of each of the rotatable blocks into the corresponding one of the position-limiting grooves. At this time, each of the two first connecting members 211 and a corresponding one of the two second connecting members 212 form a fixed connection. To unlock, each of the rotatable blocks can be rotated to the first position again through the operating members 2117.

Embodiment 5

[0076] Referring to FIGS. 37 to 41, the difference between this embodiment and Embodiment 1 is that, unlike the inserting connection between the intermediate connecting member 213 and the four first connecting members 211 in Embodiment 1, the intermediate connecting member 213 and the four first connecting members 211 in this embodiment are connected by an insertion and rotatable connection.

[0077] That is to say, the intermediate connecting member 213 needs to be firstly inserted into corresponding ones of the four first connecting members 211 on adjacent elastic units 21 of the plurality of elastic units 21, and then the intermediate connecting member 213 is rotated at a certain angle to achieve the fixed connection between the intermediate connecting member 213 and the corresponding ones of the four first connecting members 211 on the adjacent elastic units 21. To this end, the corresponding ones of the four first connecting members 211 on the adjacent elastic units 21 are arc-shaped slots extending along a rotation direction of the intermediate connecting member 213. The intermediate connecting member 213 comprises first parts 2138 disposed in the arc-shaped slots and second parts 2131 passing through the arc-shaped slots. A diameter of a first end of each of the arc-shaped slots is larger than a diameter of each of the second parts 2131, and a diameter of a second end of each of the arc-shaped slots is smaller than the diameter of each of the second parts 2131. When the second parts 2131 are rotated to correspond to the first ends of the arc-shaped slots, a connection between the intermediate connecting member 213 (i.e., a connecting member) and the adjacent first connecting members 211 (i.e., a connecting fitting member) is released. When the second parts 2131 are rotated to correspond to the second ends of the arc-shaped slots, the connecting member and the connecting fitting member are interlocked with each other in a direction opposite to a direction in which the connecting member is inserted into the connecting fitting member.

[0078] The advantage of this connection method is that the intermediate connecting member 213 can be connected to four elastic units 21 of the plurality of elastic units 21, as long as four first parts 2138 (i.e., the first parts 2138) and four second parts 2131 (i.e., the second parts 2131) inserted into four different arc-shaped slots belonging to the four elastic units 21 are provided.

[0079] Similarly, to facilitate the rotation operation, a surface of the intermediate connecting member 213 comprises an operating member 2132 for the user to user to conveniently drive the intermediate connecting member 213 to rotate.

Embodiment 6

[0080] Referring to FIGS. 42 to 48, the difference between this embodiment and embodiment 4 is that although each of the plurality of elastic units 21 in this embodiment is only provided with four first connecting members 211, there is no need to provide an intermediate connecting member, and the fixed connection is achieved directly by connecting one of the four first connecting members 211 of one of the plurality of elastic units 21 to one of the four first connecting members 211 of the other one of the plurality of elastic units 21.

[0081] To this end, each of the four first connecting members 211 comprises an inserting portion and an inserted portion which extend along a circumferential direction of a corresponding one of the plurality of elastic units 21. The inserting portion and the inserted portion that respectively belong to adjacent two elastic units 21 of the plurality of elastic units 21 are inserted into each other.

[0082] Specifically, the inserting portion comprises an elastic arm 2113 and a positioning buckling point 2114 disposed on the elastic arm 2113. The inserted portion comprises a positioning groove 2115 that can be matched with the positioning buckling point 2114. The inserted portion also comprises a position-providing opening 2116 in which the elastic arm 2111 can swing. The elastic arm 2111 swings along a direction toward the position-providing opening 2116 due to an external force, so that the positioning buckling point 2114 is separated from the positioning groove 2115. Therefore, when unlocking, the user only needs to press the elastic arm 2113 to drive the positioning buckling point 2114 and the positioning groove 2115 to be separated from each other.

[0083] The embodiments disclosed above are provided solely as examples of preferred implementations and are not intended to limit the present disclosure. The underlying design concepts of the present disclosure are not restricted to these specific embodiments. Accordingly, any modifications or variations that a person having ordinary skill in the art may makewithout departing from the scope of the technical teachings disclosed hereinare intended to be encompassed within the scope of the present disclosure. In other words, any embodiment that incorporates the inventive concepts disclosed herein, even if such embodiment only makes non-substantial changes relative to the disclosed embodiments, is considered to fall within the protection afforded by the present disclosure.