Waist rest rotation locking mechanism and swivel chair

Abstract

The utility model relates to a waist rest rotation locking mechanism and a swivel chair, the waist rest rotation locking mechanism comprises a fixed body and a connecting body hinged with the fixed body, an unlocking position is arranged in the connecting body, a locking position is arranged in the fixed body, and a lock hook which alternately moves between the unlocking position and the locking position is rotatably connected on the connecting body. The elastic force direction of the elastic piece faces the locking position between the fixing body and the connecting body, when the lock hook is located in the locking position, the elastic piece is compressed in the axial direction, and when the lock hook is located in the unlocking position, the elastic piece releases the elastic force in the axial direction. A lock hook capable of being rotationally adjusted outside is further arranged between the connecting body and the fixing body which are hinged, the lock hook can swing and switch between the waist rest locking angle and the waist rest fixing angle, and when the lock hook rotates to the locking position, the lock hook is hooked in the locking position to prevent the fixing body and the connecting body from swinging with the hinge shaft as the axis. Therefore, the connecting body is fixed at an angle formed by the fixing body, and the lumbar vertebra of a user can be supported and fixed according to a correct waist leaning angle.

Description

Technical Field

[0001] The utility model belongs to the technical field of office furniture, and particularly relates to a lumbar support rotation locking mechanism and a swivel chair. Background Art

[0002] The part of the human body or quadrupeds that lies above the hips and below the ribs, located on either side of the spine, between the hip bones and the false ribs. The part of an object that corresponds to or resembles the human waist; the middle of an object, especially the part that is narrower or thinner than the ends. The waist is the most important connecting part of the human body, supporting many activities. If you don't take good care of your waist while you're young, problems will gradually develop as you age. Therefore, adding a lumbar support to a seat can effectively protect your waist.

[0003] The sliding lumbar support adjustment mechanism of the backrest chair disclosed in patent CN219438625U includes a base, an adjustment component, and a sliding lumbar support. The sliding lumbar support is installed on the base, and the adjustment component is arranged between the base and the sliding lumbar support. The sliding lumbar support is provided with a sliding device that can slide relatively, and the adjustment component is provided with a handle that can rotate to adjust the angle of the sliding lumbar support. When the user turns the handle, the cam in the middle of the adjustment component is extended and retracted, driving the sliding lumbar support to change the angle, thereby realizing the adjustment of the sliding lumbar support angle. The sliding lumbar support can slide up and down a certain distance. When the user of the utility model lies back, the sliding lumbar support is forced to move with the force, so that clothes will not slide when lying down, reducing the trouble of users needing to tidy up clothes after lying back to relieve fatigue. At the same time, the adjustable angle of the sliding lumbar support solves the problem of waist angle adaptation for multiple users.

[0004] In the above scheme, although a buffer device is provided between the sliding plate and the lumbar support frame, so that the lumbar support frame can swing with damping, thereby achieving adaptive adjustment according to the waist angle, when the lumbar support is subjected to greater pressure, the lumbar support cannot provide hard support to maintain the lumbar spine shape, which is very disadvantageous for users with lumbar spine problems. Utility Model Content

[0005] The purpose of the present utility model is to provide a lumbar support rotation locking mechanism and a swivel chair that can solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The lumbar support rotation locking mechanism includes a fixed body and a connecting body hinged to the fixed body, an unlocking position is provided in the connecting body, a locking position is provided in the fixed body, a lock hook is rotatably connected to the connecting body and moves alternately between the unlocking position and the locking position, and an elastic member between the fixed body and the connecting body with the elastic force direction toward the locking position. When the lock hook is in the locking position, the elastic member is axially compressed, and when the lock hook is in the unlocking position, the elastic member releases the elastic force axially.

[0008] In the lumbar support rotation locking mechanism, the locking position and the locking hook have an arc-shaped guiding structure in the direction of the swinging running track of the locking hook.

[0009] In the lumbar support rotation locking mechanism, the arc-shaped guide structure includes an arc-shaped concave surface provided on a side of the locking hook close to the elastic member, and the locking position has an arc-shaped convex surface matching the arc-shaped concave surface.

[0010] In the lumbar support rotation locking mechanism, the locking hook is connected to a control member that at least partially extends into the connecting body through a knob hole provided on the connecting body.

[0011] In the lumbar support rotation locking mechanism, at least one positioning slot is provided on the inner wall of the knob hole, and an elastic tenon matching the positioning slot is provided on the arc surface of the operating member located inside the knob hole.

[0012] In the lumbar support rotation locking mechanism, when the locking hook abuts against the locking position, the elastic tenon is embedded in the positioning slot.

[0013] In the lumbar support rotation locking mechanism, two rotation limit blocks are provided on the inner wall of the knob hole, and at least one rotation limit protrusion abutting against the rotation limit block is provided on the arc surface of the knob inside the knob hole.

[0014] In the lumbar support rotation locking mechanism, when the lock hook abuts against the locking position, the rotation limiting block abuts against the rotation limiting protrusion.

[0015] In the lumbar support rotation locking mechanism, a lock hook baffle is provided in the connector, the side of the lock hook connected to the operating member contacts the inner wall of the connector, and the opposite side of the lock hook contacts the lock hook baffle.

[0016] The utility model also provides a swivel chair, which comprises the lumbar support rotation locking mechanism.

[0017] The advantages of the utility model are:

[0018] A locking hook that can be externally rotated and adjusted is also provided between the hinged connecting body and the fixed body. The locking hook can swing and switch between locking the lumbar support angle and unlocking the lumbar support fixed angle. When the locking hook is rotated to the locking position, the locking hook is hooked in the locking position to prevent the fixed body and the connecting body from swinging around the hinge axis, thereby fixing the angle between the connecting body and the fixed body, so that the user's lumbar spine can be supported and fixed according to the correct lumbar support angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the lumbar support frame structure of the present utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the connector of the utility model.

[0021] Figure 3 This is a schematic diagram of the fixed body structure of the utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the control component of the utility model.

[0023] Figure 5 This is a schematic diagram of the knob hole structure of the utility model.

[0024] Figure 6 This is a schematic diagram of the fixing mode of the utility model.

[0025] Figure 7 This is a schematic diagram of the free mode of the utility model.

[0026] In the figure, the connecting body 1, the knob hole 11, the positioning slot 12, the rotation limit block 13, the lock hook baffle 14, the fixed body 2, the locking position 21, the arc-shaped convex surface 22, the lock hook 3, the operating member 31, the elastic tenon 32, the rotation limit protrusion 33, the arc-shaped concave surface 34, and the elastic member 4. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments. Example 1

[0028] like Figure 1-Figure 5 As shown, the lumbar support rotation locking mechanism includes a fixed body 2 and a connecting body 1 hinged to the fixed body 2, and is characterized in that an unlocking position is provided in the connecting body 1, a locking position 21 is provided in the fixed body 2, a lock hook 3 is rotatably connected to the connecting body 1 and moves alternately between the unlocking position and the locking position 21, and an elastic member 4 with the elastic force direction toward the locking position 21 between the fixed body 2 and the connecting body 1, when the lock hook 3 is in the locking position 21, the elastic member 4 is axially compressed, and when the lock hook 3 is in the unlocking position, the elastic member 4 releases the elastic force axially.

[0029] That is, a lock hook 3 that can be externally rotated and adjusted is provided between the hinged connecting body 1 and the fixed body 2. The lock hook 3 can swing and switch between locking the lumbar support angle and unlocking the lumbar support fixed angle. When the lock hook 3 is rotated to the locking position 21, the lock hook 3 is hooked in the locking position 21 to prevent the fixed body 2 and the connecting body 1 from swinging around the hinge axis, thereby fixing the angle between the connecting body 1 and the fixed body 2, so that the user's lumbar spine can be supported and fixed according to the correct lumbar support angle.

[0030] The elastic member 4 may be a compression-resistant component such as a spring or a spring sheet.

[0031] In this embodiment, in the swinging trajectory direction of the lock hook 3 , the locking portion 21 and the lock hook 3 have an arc-shaped guiding structure.

[0032] The arc structure needs to avoid the swinging process of the lock hook 3. When the lock hook 3 swings to the locking position 21, the arc structure needs to be matched and contacted to achieve the effect of locking the lock hook 3.

[0033] In this embodiment, the arc-shaped guide structure includes an arc-shaped concave surface 34 provided on a side of the locking hook 3 close to the elastic member 4 , and the locking position 21 has an arc-shaped convex surface 22 matching the arc-shaped concave surface 34 .

[0034] Under the action of the elastic member 4, the fixed body 2 and the connecting body 1 will rotate outward along the hinge axis, so that the arc-shaped concave surface 34 and the arc-shaped convex surface 22 are hooked together, preventing the relative movement of the fixed body 2 and the connecting body 1 at this time. In addition, the arc-shaped cooperation between the two can also have a certain self-locking effect, which can prevent the lock hook 3 from falling off from the locking position 21 when the elastic force of the elastic member 4 is reduced.

[0035] In this embodiment, the locking hook 3 is connected to a manipulation member 31 which at least partially extends into the connecting body 1 through a knob hole 11 formed in the connecting body 1 .

[0036] A control member 31 is provided on the exterior of the connector 1, allowing the user to conveniently control the locking hook 3 within the connector 1, thereby adjusting the position of the lumbar support. One end of the control member 31 passes through the knob hole 11 and connects to the locking hook 3. The control member 31 rotates using the inner surface of the knob hole 11 as support. When the locking hook 3 is hooked to the locking position 21, the knob hole 11 bears the primary force. Therefore, a protrusion is added to the inner opening of the knob hole 11 to enhance its overall strength.

[0037] In this embodiment, at least one positioning slot 12 is defined on the inner wall of the knob hole 11 , and an elastic tenon 32 that cooperates with the positioning slot 12 is provided on the arc surface of the operating member 31 within the knob hole 11 .

[0038] The elastic tenon 32 is composed of a spring radially in the knob and a marble pushed out by the spring. When the marble rests on the knob hole 11, it is squeezed back into the knob. When the knob is rotated to the locked position, the marble pops out into the positioning slot 12, thereby fixing the rotation angle of the knob at this time and ensuring that the lock hook 3 will not slip out of the locking slot 21.

[0039] In this embodiment, when the lock hook 3 abuts against the locking position 21 , the elastic tenon 32 is locked in the positioning slot 12 .

[0040] The process of inserting the marble into the positioning slot 12 serves as a signal that the lock hook 3 reaches the locking position 21, which not only allows the knob to maintain its state, but also allows the user to have a clearer perception during operation.

[0041] In this embodiment, two rotation limit blocks 13 are provided on the inner wall of the knob hole 11 , and at least one rotation limit protrusion 33 abutting against the rotation limit block 13 is provided on the arc surface of the knob inside the knob hole 11 .

[0042] The angle formed by the two rotation limit blocks 13 and the center of the knob hole 11 is the maximum angle that the lock hook 3 can swing. By setting the rotation limit blocks 13, the swing range of the lock hook 3 in the connector 1 is limited to avoid collision between the lock hook 3 and the inner wall of the connector 1.

[0043] In this embodiment, when the lock hook 3 abuts against the locking position 21 , the rotation limiting block 13 abuts against the rotation limiting protrusion 33 .

[0044] Usually, the state in which one rotation limit block 13 and the rotation limit block 13 are in abutment with each other is used as the locking position. At this time, when the rotation limit block 13 and the rotation limit block 13 are in abutment with each other, the lock hook 3 is just parallel to the elastic direction of the elastic member 4 and one end is hooked with the arc-shaped convex surface 22 of the locking position 21, which can cooperate with the positioning slot 12 and the elastic tenon 32 to further improve the stability of the lock hook 3 in the locking position.

[0045] In this embodiment, a lock hook baffle 14 is provided in the connector 1 , and the side of the lock hook 3 connected to the operating member 31 contacts the inner wall of the connector 1 , and the opposite side of the lock hook 3 contacts the lock hook baffle 14 .

[0046] Since the supporting connections of the lock hook 3 are all concentrated at the contact point between the operating member 31 and the knob hole 11, the force applied at the hooking point between the lock hook 3 and the locking position 21 can easily cause the lock hook 3 to deflect, resulting in the part of the knob in the knob hole 11 being broken. Therefore, a lock hook baffle 14 is provided to cooperate with the inner wall of the connecting body 1 to clamp the lock hook 3 from both axial ends, thereby enhancing the stability of the lock hook 3 and protecting the operating member 31. Example 2

[0047] like Figure 6-Figure 7As shown, the technical solution in Example 1 is applied to a swivel chair, and the fixed body 2 is installed with a lumbar support height adjustment slide rail on the swivel chair base, so that the fixed body 2 can be fixed at various heights, and then the lumbar support angle can be controlled based on the fixed body 2.

[0048] There are two modes for adjusting the angle of the lumbar support. One is the free mode in which the knob is turned to the unlocked state. The angle of the lumbar support is completely supported by the elastic member 4, and the angle changes adaptively according to the force of squeezing the lumbar support. The other is the fixed mode in which the knob is turned to the locked state. The lock hook 3 is hooked in the locking position 21, so that the lumbar support cannot be rotated and is fixed at a certain angle to provide guiding support for the lumbar posture.

[0049] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A lumbar support rotation locking mechanism, comprising a fixed body (2) and a connecting body (1) hinged to the fixed body (2), characterized in that: An unlocking position is provided in the connecting body (1), a locking position (21) is provided in the fixed body (2), a locking hook (3) is rotatably connected to the connecting body (1) and moves alternately between the unlocking position and the locking position (21), and an elastic member (4) is provided between the fixed body (2) and the connecting body (1), the elastic member (4) being axially compressed when the locking hook (3) is in the locking position (21), and the elastic member (4) releases the elastic force axially when the locking hook (3) is in the unlocking position.

2. The lumbar support rotation locking mechanism according to claim 1, characterized in that: In the direction of the swinging trajectory of the locking hook (3), the locking position (21) and the locking hook (3) have an arc-shaped guiding structure.

3. The lumbar support rotation locking mechanism according to claim 2, characterized in that: The arc-shaped guide structure comprises an arc-shaped concave surface (34) provided on a side of the locking hook (3) close to the elastic member (4), and the locking position (21) has an arc-shaped convex surface (22) matching the arc-shaped concave surface (34).

4. The lumbar support rotation locking mechanism according to claim 1, characterized in that: The locking hook (3) is connected to a control member (31) that at least partially extends into the connecting body (1) through a knob hole (11) provided on the connecting body (1).

5. The lumbar support rotation locking mechanism according to claim 4, characterized in that: At least one positioning slot (12) is provided on the inner wall of the knob hole (11), and an elastic tenon (32) matching the positioning slot (12) is provided on the arc surface of the inner portion of the control member (31) located in the knob hole (11).

6. The lumbar support rotation locking mechanism according to claim 5, characterized in that: When the locking hook (3) is hooked with the locking position (21), the elastic tenon (32) is embedded in the positioning slot (12).

7. The lumbar support rotation locking mechanism according to claim 4, characterized in that: Two rotation limit blocks (13) are provided on the inner wall of the knob hole (11), and at least one rotation limit protrusion (33) abutting against the rotation limit block (13) is provided on the arc surface of the knob inside the knob hole (11).

8. The lumbar support rotation locking mechanism according to claim 7, characterized in that: When the lock hook (3) is hooked with the locking position (21), the rotation limit block (13) abuts against the rotation limit protrusion (33).

9. The lumbar support rotation locking mechanism according to claim 4, characterized in that: A lock hook baffle (14) is provided in the connecting body (1), and the side of the lock hook (3) connected to the operating member (31) contacts the inner wall of the connecting body (1), and the opposite side of the lock hook (3) contacts the lock hook baffle (14).

10. A swivel chair, characterized in that: The swivel chair includes the lumbar support rotation locking mechanism according to any one of claims 1 to 9.

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