Backrest connecting structure and seat

Abstract

The utility model discloses a backrest connecting structure, which comprises a first connecting piece, a second connecting piece and a third connecting piece, the first connecting piece comprises a first connecting part, and a connecting clamping groove is formed in the first connecting part; the second connecting piece comprises a second connecting part, and the second connecting part is inserted into the connecting clamping groove; the first connecting piece or the second connecting piece is rotationally connected with the locking piece, the locking piece is of a cam structure, and the locking piece is rotated so that the first connecting part and the second connecting part can be connected in a clamped mode. According to the backrest connecting structure, the second connecting part is matched with the connecting clamping groove, so that the contact area of the first connecting part and the second connecting part is large, the first connecting part and the second connecting part can be connected in a clamping mode only by rotating the locking piece, and then the first connecting piece and the second connecting piece are connected in a clamping mode. The whole structure is stable in connection, not prone to loosening and convenient for a user to operate. The seat comprises the backrest connecting structure, and is stable in connection and easy to operate.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, and in particular to a backrest connection structure and a seating system. Background Technology

[0002] Seating is a piece of furniture for users to sit on. For seating with a backrest, the backrest can be fixed to the seat or detached. A fixed backrest cannot be disassembled, while a detachable backrest can be disassembled according to the user's needs. Seating with a detachable backrest is more portable and easier to store, such as a wheelchair with a detachable backrest.

[0003] In related technologies, backrests often use screw and nut structures to achieve detachable connections between the backrest and other parts of the seat. This technical solution requires the use of a screwdriver to disassemble and assemble the backrest, which is inconvenient. Furthermore, when in use, the user's back needs to rest against the backrest, and the connection point between the backrest and other parts of the seat is a stress-bearing area. The connection contact surface of the screw and nut structure is small, and after long-term use, the screw and nut structure is prone to loosening, posing a certain safety hazard. Utility Model Content

[0004] The purpose of this utility model is to disclose a backrest connection structure in which the second connecting part cooperates with the connecting slot, thereby increasing the contact area between the first connecting part and the second connecting part. Furthermore, the first connecting part and the second connecting part can be engaged simply by rotating the locking part, thus achieving the engagement of the first connecting part and the second connecting part. The overall structure is stable, not easy to loosen, and easy for the user to operate.

[0005] The second objective of this utility model is to disclose a seating fixture, including the aforementioned backrest connection structure, which is stable and easy to operate.

[0006] To achieve the first objective mentioned above, this utility model discloses a backrest connection structure, comprising:

[0007] The first connector includes a first connecting part, on which a connecting slot is provided;

[0008] The second connector includes a second connecting part, which is inserted into the connecting slot;

[0009] A locking element is rotatably connected to the first or second connecting element. The locking element has a cam structure, and rotating the locking element causes the first connecting part to engage with the second connecting part.

[0010] As an optional implementation, the locking member is rotatably connected to the first connecting member or the second connecting member via the first rotating shaft. The locking member is an eccentric wheel and has an arc-shaped flange.

[0011] The first connecting part has a through hole corresponding to the position of the locking member, and the second connecting part has an arc-shaped recess corresponding to the position of the locking member. Rotating the locking member causes its arc-shaped flange to engage with the arc-shaped recess through the through hole.

[0012] As an optional implementation, the first connector further includes a third connector, the first connector and the third connector being detachably connected by a first connecting structure, or the first connector and the third connector being integrally formed.

[0013] As an optional implementation, the third connecting part is a clamping structure, which includes a first clamping part and a second clamping part, and the first clamping part and the second clamping part are rotatably connected by a second rotating shaft.

[0014] As an optional implementation, the second connector further includes a fourth connecting part, which is a sheet-like structure. The second connecting part and the fourth connecting part are detachably connected through the second connecting structure, or the second connecting part and the fourth connecting part are integrally formed.

[0015] As an optional implementation, the fourth connecting part is provided with multiple slots, and the fourth connecting part is a porous sheet structure.

[0016] As an optional implementation, the second connecting part is inserted into the connecting slot so that the first connecting part and the second connecting part form a snap-fit ​​part, the third connecting part is disposed on one side of the snap-fit ​​part, the fourth connecting part is disposed on the other side of the snap-fit ​​part, and the locking member is disposed between the third connecting part and the fourth connecting part.

[0017] As an optional implementation, the inlet of the connecting slot is provided with an arc-shaped guide section for guiding the second connecting part into the slot.

[0018] As an optional implementation, the second connecting part enters the connecting slot along the longitudinal or transverse direction.

[0019] To achieve the second objective mentioned above, this utility model discloses a seat, including the aforementioned backrest connection structure, as well as a leg structure and a backrest structure. A first connector is connected to the leg structure, and a second connector is connected to the backrest structure.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. In the backrest connection structure of this utility model, the cooperation between the second connecting part and the connecting slot results in a large contact area between the first connecting part and the second connecting part. Furthermore, the first connecting part and the second connecting part can be engaged simply by rotating the locking part, thereby achieving the engagement of the first connecting part and the second connecting part. The overall structure is stable, not easy to loosen, and easy for the user to operate.

[0022] 2. The seat in this utility model includes the above-mentioned backrest connection structure, which is stable and easy to operate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first-view structural diagram of the backrest connection structure in the snap-fit ​​state according to Embodiment 1 of this utility model;

[0025] Figure 2 This is a second-view structural diagram of the backrest connection structure in the snap-fit ​​state of Embodiment 1 of this utility model;

[0026] Figure 3 This is a third-view structural diagram of the backrest connection structure in the snap-fit ​​state in Embodiment 1 of this utility model;

[0027] Figure 4 This is Embodiment 1 of the present utility model. Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0028] Figure 5 This is Embodiment 1 of the present utility model. Figure 3 Schematic diagram of the cross-sectional structure in the BB direction;

[0029] Figure 6 This is an exploded structural diagram of the backrest connection structure of Embodiment 1 of this utility model;

[0030] Figure 7 This is a structural schematic diagram of the first connecting part from a first perspective in Embodiment 1 of this utility model;

[0031] Figure 8 This is a structural schematic diagram of the first connecting part from a second perspective in Embodiment 1 of this utility model.

[0032] Explanation of key figure labels:

[0033] 10. First connector; 101. First connecting part; 102. Connecting slot; 103. Through hole; 104. Third connecting part; 1041. First clamping part; 1042. Second clamping part; 105. First connecting structure; 106. Arc-shaped guide section; 20. Second connector; 201. Second connecting part; 202. Arc-shaped recess; 203. Fourth connecting part; 204. Second connecting structure; 205. Slot; 30. Locking element; 301. Arc-shaped flange; 40. First pivot; F. Direction of the push force from the user's back on the backrest. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0037] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0038] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0039] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0040] Example 1

[0041] Please see Figures 1-8 This application discloses a backrest connection structure, including: a first connector 10, which includes a first connecting portion 101 and a connecting slot 102 provided on the first connecting portion 101; a second connector 20, which includes a second connecting portion 201 inserted into the connecting slot 102; and a locking member 30, which is rotatably connected to the first connector 10 or the second connector 20. The locking member 30 is a cam structure, and rotating the locking member 30 causes the first connecting portion 101 to engage with the second connecting portion 201.

[0042] In the backrest connection structure of this utility model, the second connecting part 201 cooperates with the connecting slot 102, so that the contact area between the first connecting part 101 and the second connecting part 201 is large. Moreover, the first connecting part 101 and the second connecting part 201 can be engaged by simply rotating the locking part 30, thereby realizing the engagement of the first connecting part 10 and the second connecting part 20. The overall structure is stable and not easy to loosen, and it is also easy for the user to operate.

[0043] In this embodiment of the utility model, the locking member 30 is rotatably connected to the first connecting member 10 or the second connecting member 20 via the first rotating shaft 40. The locking member 30 is an eccentric wheel and has an arc-shaped flange 301. The first connecting part 101 is provided with a through hole 103 corresponding to the position of the locking member 30, and the second connecting part 201 is provided with an arc-shaped recess 202 corresponding to the position of the locking member 30. Rotating the locking member 30 causes its arc-shaped flange 301 to engage with the arc-shaped recess 202 through the through hole 103.

[0044] If the position of the second connecting part 201 corresponding to the locking member 30 is a straight part, the locking member 30 and the second connecting part 201 are in line contact, while the arc-shaped concave part 202 and the arc-shaped flange 301 are in surface contact. The arc-shaped concave part 202 increases the contact area between the second connecting part 201 and the locking member 30, thereby increasing the connection stability between the second connecting part 201 and the locking member 30.

[0045] See Figures 1-6The following example illustrates the process of using the locking member 30 to be rotatably connected to the first connecting member 10 via the first rotating shaft 40.

[0046] It should be noted that when the arc-shaped flange 301 of the locking member 30 engages with the arc-shaped recess 202, the locking member 30 restricts the separation of the second connecting part 201 from the connecting slot 102. At this time, the first connecting part 101 and the second connecting part 201 can be in a state of mutual contact. At this time, both the first connecting part 101 and the locking member 30 limit the second connecting part 201, achieving double limiting, thereby preventing the second connecting part 201 from coming out of the first connecting part 101, and making the connection between the first connecting member 10 and the second connecting member 20 more stable.

[0047] Of course, in some application scenarios, when the arc-shaped flange 301 of the locking member 30 is engaged with the arc-shaped recess 202, there is an installation gap between the first connecting part 101 and the second connecting part 201. This installation gap is smaller than the thickness of the second connecting part 201 in the pressing direction of the locking member 30. Therefore, when the arc-shaped flange 301 of the locking member 30 is engaged with the arc-shaped recess 202, the second connecting part 201 will not come out of the connecting slot 102. At this time, the second connecting part 201 is only limited by the locking member 30.

[0048] Specifically, the first connecting part 101 is provided with a fixing position for connecting and fixing with the first rotating shaft 40. In order to make the first rotating shaft 40 bear force evenly, the first connecting part 101 is provided with two fixing positions, which are respectively located at both ends of the first rotating shaft 40. Each fixing position is provided with a rotating shaft connecting hole for connecting and fixing with the first rotating shaft 40. The two ends of the first rotating shaft 40 are mounted on the two fixing positions through the corresponding rotating shaft connecting holes, and the through hole 103 is located between the two fixing positions. In this way, when the locking member 30 rotates around the first rotating shaft 40, the arc-shaped flange 301 of the locking member 30 can cooperate with the arc-shaped recess 202 through the through hole 103.

[0049] In order to increase the contact area between the second connecting part 201 and the connecting slot 102, the locking member 30 is provided on the outside of the connecting slot 102. For example, the first connecting part 101 can be provided with a fixing lug at the fixing position to realize the installation of the first rotating shaft 40.

[0050] There is a gap between the rotation center of the locking member 30 and the connecting slot 102. The distance between the rotation center of the locking member 30 and the connecting slot 102 is a. The distance from the center of the locking member 30 to the farthest point of the locking member 30 is the maximum radius b of the locking member 30, b > a. The depth of the arc-shaped recess 202 is set to c, b ≥ a + c.

[0051] In this embodiment of the utility model, the first connector 10 further includes a third connector 104. The first connector 101 and the third connector 104 are detachably connected by the first connector structure 105, or the first connector 101 and the third connector 104 are integrally formed.

[0052] See Figures 1-6 The following description takes the detachable connection of the first connecting part 101 and the third connecting part 104 via the first connecting structure 105 as an example. The first connecting structure 105 includes a first locking screw. Both the first connecting part 101 and the third connecting part 104 are provided with first screw connection holes for connection with the first locking screw. The detachable connection between the first connecting part 101 and the third connecting part 104 is achieved by tightening the first locking screw. Since the direction of the first locking screw is at an angle to the direction of the user's back thrust on the backrest, for example, the direction of the user's back thrust on the backrest is... Figures 1-3 The first locking screw is in indirect contact with the backrest, and the backrest is not easily loosened by the push force from the user's back. As a result, the connection position between the first connecting part 101 and the third connecting part 104 is more stable.

[0053] In this embodiment of the utility model, the third connecting part 104 is a clamping structure. The third connecting part 104 includes a first clamping part 1041 and a second clamping part 1042. The first clamping part 1041 and the second clamping part 1042 are rotatably connected by a second rotating shaft (not shown in the figure).

[0054] It should be noted that the third connecting part 104 can be detachably connected to the leg support of the seat, such as the leg support of a wheelchair. In use, rotating the first clamping part 1041 and / or the second clamping part 1042 opens the third connecting part 104, and rotating the first clamping part 1041 and / or the second clamping part 1042 in the opposite direction closes the third connecting part 104.

[0055] In order to achieve the clamping of the first clamping part 1041 and the second clamping part 1042, a reset torsion spring can be provided at the second rotating shaft position, or the first clamping part 1041 and the second clamping part 1042 can be locked by using clamping screws. Both the first clamping part 1041 and the second clamping part 1042 are provided with clamping connection holes for cooperating with clamping screws.

[0056] In this embodiment of the utility model, the second connector 20 further includes a fourth connector 203, which is a sheet-like structure. The second connector 201 and the fourth connector 203 are detachably connected by the second connector structure 204, or the second connector 201 and the fourth connector 203 are integrally formed.

[0057] See Figures 1-6The following explanation uses the example of the second connecting part 201 and the fourth connecting part 203 being detachably connected via the second connecting structure 204. The second connecting structure 204 includes a second locking screw. Both the second connecting part 201 and the fourth connecting part 203 are provided with second screw connection holes for connection with the second locking screw. The detachable connection between the second connecting part 201 and the fourth connecting part 203 is achieved by tightening the second locking screw. Since the direction of the second locking screw is at an angle to the direction of the user's back thrust on the backrest, for example, the direction of the user's back thrust on the backrest is... Figures 1-3 The second locking screw is in indirect contact with the backrest, and the backrest is not easily loosened by the push force from the user's back. As a result, the connection position between the second connecting part 201 and the fourth connecting part 203 is more stable.

[0058] In this embodiment of the utility model, the fourth connecting part 203 is provided with a plurality of slots 205, and the fourth connecting part 203 is a porous sheet structure.

[0059] Specifically, the slots 205 are staggered along the horizontal or vertical direction to avoid the slots 205 having a significant impact on the overall strength of the fourth connection part 203.

[0060] It should be noted that this backrest connection structure is often used as a backrest connection structure. Therefore, the first connector 10 or the second connector 20 needs to be connected to the backrest. The second connector 20 is set to be connected to the backrest. Since the backrest is a sheet structure, in order to increase the contact area between the second connector 20 and the backrest and enhance the connection stability between the second connector 20 and the backrest, the second connector 20 is also a sheet structure. Furthermore, a slot 205 is provided on the fourth connection part 203 to reduce the weight of the second connector 20.

[0061] Furthermore, since the fourth connecting part 203 is provided with a slot 205, by limiting the size of the slot 205, the slot 205 can cooperate with the second locking screw to form the second connecting structure 204, eliminating the need to drill additional holes in the fourth connecting part 203 and reducing production costs.

[0062] The fourth connecting part 203 can be in the shape of an "I" or an "L" to facilitate the connection between the fourth connecting part 203 and the backrest. The specific shape of the fourth connecting part 203 can be adjusted according to the actual application scenario and is not limited.

[0063] In this embodiment of the utility model, the second connecting part 201 is inserted into the connecting slot 102 so that the first connecting part 101 and the second connecting part 201 form a snap-fit ​​part, the third connecting part 104 is disposed on one side of the snap-fit ​​part, the fourth connecting part 203 is disposed on the other side of the snap-fit ​​part, and the locking member 30 is disposed between the third connecting part 104 and the fourth connecting part 203.

[0064] See Figures 1-6 For example, the third connecting part 104 is located on the left side of the latching part, the fourth connecting part 203 is located on the right side of the latching part, the locking member 30 is located between the third connecting part 104 and the fourth connecting part 203, and the locking member 30 has a handle. The handle of the locking member 30 faces the rear side, which makes it convenient for the user to operate the locking member 30 and avoids interference with the first connecting member 10 and the second connecting member 20 when operating the locking member 30.

[0065] In this embodiment of the present invention, the inlet of the connecting slot 102 is provided with an arc-shaped guide section 106 for guiding the second connecting part 201 into the slot.

[0066] See Figure 4 Because of the arc-shaped guide section 106, the user can hold the second connector 20 and insert its second connector 201 along the arc-shaped guide section 106 into the connector slot 102 without having to align it multiple times, making it easy to use.

[0067] In this embodiment of the utility model, the second connecting part 201 enters the connecting slot 102 along the longitudinal or transverse direction.

[0068] Continue reading Figure 4 For example, the inlet of the connecting slot 102 is set upwards. At this time, an auxiliary opening communicating with its inlet is provided on the side of the connecting slot 102, so that the second connecting part 201 is inserted into the connecting slot 102 from top to bottom. The second connecting part 201 enters the connecting slot 102 along the longitudinal direction. The locking member 30 is rotated clockwise or counterclockwise until the arc-shaped flange 301 and the arc-shaped recess 202 are engaged.

[0069] In other application scenarios, for example, the inlet of the connecting slot 102 is set downwards. In this case, an auxiliary opening communicating with its inlet is provided on the side of the connecting slot 102, so that the second connecting part 201 is inserted into the connecting slot 102 from bottom to top. The second connecting part 201 enters the connecting slot 102 along the longitudinal direction. The locking member 30 is rotated clockwise or counterclockwise until the arc-shaped flange 301 and the arc-shaped recess 202 are engaged.

[0070] In other application scenarios, for example, the entrance of the connecting slot 102 is set to the right, the second connecting part 201 is inserted into the connecting slot 102 from right to left, the second connecting part 201 enters the connecting slot 102 in the lateral direction, and the locking member 30 is rotated clockwise or counterclockwise until the arc-shaped flange 301 and the arc-shaped recess 202 are engaged.

[0071] In other application scenarios, for example, the entrance of the connecting slot 102 is set to the left, and the second connecting part 201 is inserted into the connecting slot 102 from left to right. The second connecting part 201 enters the connecting slot 102 in the lateral direction, and the locking member 30 is rotated clockwise or counterclockwise until the arc-shaped flange 301 and the arc-shaped recess 202 are engaged.

[0072] Example 2

[0073] This utility model discloses a seat, including the aforementioned backrest connection structure, as well as a leg structure and a backrest structure. The first connector 10 is connected to the leg structure, and the second connector 20 is connected to the backrest structure.

[0074] The seating in this invention includes the aforementioned backrest connection structure, which provides a stable connection and is easy to operate.

[0075] In use, the third connecting part 104 of the first connecting member 10 can be connected to the leg structure, and the fourth connecting part 203 of the second connecting member 20 can be connected to the backrest structure. When the first connecting part 101 and the second connecting part 201 are engaged, the connection between the leg structure and the backrest structure is completed.

[0076] The foregoing has provided a detailed description of a backrest connection structure and a seat according to embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the backrest connection structure and seat of the present invention and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A backrest connecting structure characterized by comprising: The utility model relates to a connecting device, including: First connecting piece (10), first connecting piece (10) includes first connecting part (101), and the first connecting part (101) is provided with connecting card slot (102); Second connecting piece (20), second connecting piece (20) includes second connecting part (201), and the second connecting part (201) is inserted in connecting card slot (102); Locking piece (30), the first connecting piece (10) or second connecting piece (20) is rotatably connected with locking piece (30), locking piece (30) is cam structure, and rotating locking piece (30) to make first connecting part (101) with second connecting part (201) is clamped.

2. The backrest connection structure according to claim 1, characterized in that: Locking piece (30) is rotatably connected with first connecting piece (10) or second connecting piece (20) through first pivot (40), and locking piece (30) is eccentric wheel, and locking piece (30) has arc flange (301); First connecting part (101) is provided with through hole (103) corresponding the position of locking piece (30), and second connecting part (201) is provided with arc recess (202) corresponding the position of locking piece (30), and rotating locking piece (30) makes its arc flange (301) pass through through hole (103) and cooperate with arc recess (202).

3. The backrest connection structure according to claim 2, characterized in that: First connecting piece (10) further includes third connecting part (104), and first connecting part (101) and third connecting part (104) are detachably connected through first connecting structure (105), or first connecting part (101) and third connecting part (104) are integrally made.

4. The backrest connection structure according to claim 3, characterized in that: Third connecting part (104) is hoop structure, and third connecting part (104) includes first clamping part (1041) and second clamping part (1042), and first clamping part (1041) and second clamping part (1042) are rotatably connected through second pivot.

5. The backrest connection structure according to claim 3, characterized in that: Second connecting piece (20) further includes fourth connecting part (203), and fourth connecting part (203) is sheet structure, and second connecting part (201) and fourth connecting part (203) are detachably connected through second connecting structure (204), or second connecting part (201) and fourth connecting part (203) are integrally made.

6. The backrest connection structure according to claim 5, characterized in that: Multiple slot holes (205) are arranged on fourth connecting part (203), and fourth connecting part (203) is porous sheet structure.

7. The backrest connection structure according to claim 5, characterized in that: Second connecting part (201) is inserted in connecting card slot (102) to make first connecting part (101) and second connecting part (201) form clamping part, third connecting part (104) is arranged on one side of clamping part, fourth connecting part (203) is arranged on the other side of clamping part, and locking piece (30) is arranged between third connecting part (104) and fourth connecting part (203).

8. The backrest connection structure according to any one of claims 1 to 7, characterized in that: The entrance of connecting card slot (102) is provided with arc guide section (106) for guiding the entry of second connecting part (201).

9. The backrest connection structure according to any one of claims 1 to 7, characterized in that: The second connecting part (201) enters the connecting slot (102) along a longitudinal direction or a transverse direction.

10. A seat furniture, characterized in that The backrest connecting structure as claimed in claim 1, further comprising a leg structure and a backrest structure, the first connecting part (10) being connected with the leg structure, and the second connecting part (20) being connected with the backrest structure.

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