Back-chasing linkage mechanism

Abstract

The utility model discloses a back-chasing linkage mechanism which comprises a seat cushion and a seat body, the seat cushion is installed above the seat body, an installation piece is arranged in a cavity of the seat body, the end of the installation piece is movably connected with a transmission piece, a driving assembly is arranged in a cavity of the installation piece, and the driving assembly is used for driving the transmission piece to move in the stroke. The installation part is movably connected with a chair back inner rod, the end part of the chair back inner rod is movably connected with a chair back main body, the transmission part is fixedly connected with the chair back main body, and the structure of an existing chair back-chasing linkage mechanism is changed, so that the problem that the existing chair back-chasing linkage mechanism is easy to generate one-way force under the weight of a user is solved; and when the user inclines backwards, the seat cushion is stressed, so that the sitting posture is changed.

Description

Technical Field

[0001] The utility model belongs to the technical field of seats, and in particular relates to a back-chasing linkage mechanism. Background Art

[0002] Seats are a common daily necessity. Generally speaking, after a seat is produced, its backrest and seat cannot be moved anymore. Therefore, we often find that when a large number of people use seats, there is always a distance between the user's back and the backrest of the seat, and the backrest cannot provide good support for the user. This leads to the user's sitting feeling not being good enough, and problems such as back pain when sitting for a long time. In order to improve the user's sitting feeling, the industry has been improving the seats in recent years. For example, by adding a back-chasing linkage mechanism between the backrest and the seat of the seat, the backrest and the seat can be adjusted, so that the backrest can better fit the user's back.

[0003] Patent document CN218889463U discloses a seat with an adjustable backrest, which is mainly achieved by adding a four-bar linkage to the back support and the seat support. When a user sits on the seat, the four-bar linkage of the seat support is subjected to downward pressure, which drives the four-bar linkage of the back support to move, and the backrest moves forward until it contacts the user's waist and back, thereby supporting the user's waist and back. However, it is found during long-term use that the four-bar linkage is prone to generate unidirectional force under the weight of the user, causing the support part inside the end of the backrest to approach the user, and the seat cushion to be stressed when the user leans back, causing the sitting posture to change and affecting comfort. In order to optimize this solution, practitioners have designed a back-chasing linkage mechanism. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the structure of the existing seat back-chasing linkage mechanism is prone to generate a unidirectional force under the weight of the user, causing the internal support member at the end of the backrest to move closer to the user, and when the user leans back, the seat cushion is stressed, causing the sitting posture to change.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions: a back-chasing linkage mechanism, including a seat cushion and a seat body, the seat cushion is installed above the seat body, a mounting piece is provided in the seat body cavity, the mounting piece is movably connected with a transmission piece, a driving component is provided in the mounting piece cavity, the driving component is used to drive the transmission piece to move within a stroke, the mounting piece is movably connected with a seat back inner rod, the end of the seat back inner rod is connected to the seat back body through a rotating piece, and the transmission piece is fixedly connected to the seat back body;

[0006] The mounting member is matched with the transmission member via a movable rod, and a guide groove for guiding the movement track of the movable rod is provided on the side wall of the mounting member.

[0007] Furthermore, the driving assembly is connected to the movable rod, and the driving assembly drives the movable rod to move in the guide groove and fix its position.

[0008] Furthermore, a limiting rod for limiting the lowest position of the inner rod of the seat back is arranged on the transmission member.

[0009] Furthermore, a pre-embedded nut is provided on the side wall of the mounting member, and the pre-embedded nut is used for the subsequent installation of the movable rod and the limiting rod.

[0010] Furthermore, the driving assembly includes a pneumatic part horizontally arranged in the cavity of the mounting part, a driving part is arranged on the telescopic rod of the pneumatic part, and the driving part is sleeved on the movable rod.

[0011] Furthermore, an adjusting member for controlling the displacement length of the telescopic rod of the pneumatic member is provided in the pneumatic member cavity, a pull rope for controlling its start and stop is provided on the adjusting member, a locking member for controlling its retraction and extension length is provided at the end of the pull rope, and the locking member is fixedly provided at the bottom of the seat body.

[0012] Furthermore, the driving assembly includes an electric cylinder horizontally arranged in the cavity of the mounting member, a driving member is arranged on the telescopic rod of the electric cylinder, and the driving member is sleeved on the movable rod.

[0013] Furthermore, an embedded groove is provided on the side wall of the inner rod of the seat back, and the embedded groove is used for the inner rod of the seat back to be placed at the lowest position to cooperate with the limit rod.

[0014] Beneficial effects: The utility model has reasonable design, simple and stable structure, strong practicality, and has the following beneficial effects:

[0015] 1. The mounting part and the transmission part are arranged in a movable cooperation through the movable rod and the guide groove, so that the rotation of the transmission part will maintain a certain rotation trajectory, and the movable rod is controlled by the driving assembly, thereby effectively avoiding the unidirectional force generated under the weight of the user, so that the support part inside the end of the backrest is close to the user;

[0016] 2. The drive assembly can control the movable rod to lock its position within any stroke, thereby effectively preventing the seat cushion from being stressed when the user leans back, causing the sitting posture to change;

[0017] 3. The inner rod of the seat back is limited by the lowest position of the limit rod, so as to prevent the seat back from tipping over when the drive component is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the matching structure of the mounting member and the transmission member of the utility model;

[0020] Figure 3 It is a schematic diagram of the overall structure of the chasing mechanism of the utility model;

[0021] Figure 4 It is a schematic diagram of the connection structure between the inner rod of the chair back and the chair back body of the utility model;

[0022] Figure 5 It is an enlarged schematic diagram of the structure of part A of the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the inner rod of the chair back of the utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the second embodiment of the present utility model.

[0025] In the figure: 1-seat cushion, 2-seat body, 3-mounting part, 4-transmission part, 5-movable rod, 6-guide groove, 7-driving assembly, 8-seat back inner rod, 9-limiting rod, 10-seat back body, 11-embedded groove;

[0026] 701-pneumatic part, 702-driving part, 703-adjusting part, 704-pull rope, 705-locking part, 706-electric cylinder. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] Embodiment 1:

[0029] Combination Figure 1-4The seat back linkage mechanism shown in the figure includes a seat cushion 1 and a seat body 2. The seat cushion 1 is installed above the seat body 2. A mounting member 3 is provided in the cavity of the seat body 2. The mounting member 3 is movably connected with a transmission member 4. The movable connection facilitates the subsequent engagement with a driving component 7 so that the two can move within an effective stroke. The mounting member 3 and the transmission member 4 are matched through a movable rod 5. A guide groove 6 for guiding the movement trajectory of the movable rod 5 is provided on the side wall of the mounting member 3. The guide groove 6 is arranged in an arc shape. The arc shape can accommodate the rotation angle of the transmission member 4 under the linear action of the driving component 7 to avoid jamming. In addition, through the cooperation between the movable rod 5 and the guide groove 6, the movement trajectory of the transmission member 4 can be effectively controlled. A driving component 7 is provided in the cavity of the mounting member 3. The driving component 7 serves as the main power source and is used to drive the movable rod 5 to move in the guide groove 6 and fix its position. A seat back inner rod 8 is movably connected to the mounting member 3. The rod 8 is set in an "L" shape, and its unique shape can adapt to the rotation angle of the transmission member 4. A limit rod 9 is set on the transmission member 4 to limit the lowest position of the inner rod 8 of the seat back. The limit rod 9 can effectively limit the seat back body 10 from adjusting back to the starting position. Among them, embedded nuts are set on the side walls of the mounting member 3. The embedded nuts are used for the subsequent installation of the movable rod 5 and the limit rod 9, which is convenient for quick assembly. The end of the inner rod 8 of the seat back is connected to the seat back body 10 through a rotating member. The rotating member is a connecting member that fixes the seat back to the seat back body 10. The rotating member is an existing connecting member that cooperates with rotation. A rotatable state is formed between it and the inner rod 8 of the seat back, which is convenient for the subsequent adjustment of the inner rod 8 of the seat back to form a follow-up movement with the seat back body 10. A fixed connection is adopted between the rotating member and the seat back body 10. The seat back body 10 is an outer covering wrapping member, and the inner rod 8 of the seat back is hidden inside it, thereby effectively hiding some parts and ensuring the overall aesthetics. The transmission member 4 is fixedly connected to the seat back body 10.

[0030] In this embodiment, the Figure 5 The driving assembly 7 includes a pneumatic part 701 horizontally arranged in the cavity of the mounting part 3. The pneumatic part is a kind of gas spring or hydraulic rod. A driving part 702 is arranged on the telescopic rod of the pneumatic part 701. The driving part 702 is sleeved on the movable rod 5. The driving assembly works by controlling the telescopic rod of the pneumatic part 701. During the operation, the driving part 702 is displaced to realize the operation of the movable rod 5 in the guide groove 6, thereby acting on the transmission part 4, so that the transmission part 4 moves within the set stroke at the end of the mounting part 3. During the movement of the transmission part 4, it acts on the chair back body 10 to reciprocate. During the reciprocating swing of the chair back body 10, the inner rod 8 of the chair back moves with it to realize adaptive adjustment.

[0031] In addition, an adjusting member 703 for controlling the displacement length of the telescopic rod of the pneumatic member 701 can also be provided in the cavity of the pneumatic member 701, and a pull rope 704 for controlling the start and stop of the adjusting member 703 is provided on the adjusting member 703, and a locking member 705 for controlling the retracted and extended length of the pull rope 704 is provided at the end of the pull rope 704, and the locking member 705 is fixedly arranged at the bottom of the seat body 2. This method controls the drive component 7 from the outside, mainly using the locking member 705 to pull the pull rope 704 to control the contact between the adjusting member 703 and the end air valve of the pneumatic member 701, so that the telescopic rod of the pneumatic member 701 can be operated, thereby realizing a more convenient start and stop of the drive component 7.

[0032] In this embodiment, the Figure 6 An embedded groove 11 is provided on the side wall of the inner rod 8 of the chair back. The embedded groove 11 is used to place the inner rod 8 of the chair back in the lowest position to cooperate with the limit rod 9, so as to avoid the chair back body from tipping over when the driving component is damaged. At the same time, the embedded groove 11 also prevents the inner rod 8 of the chair back from further shaking and causing abnormal noise when it is placed in the lowest position.

[0033] Embodiment 2: The driving component 7 in the embodiment 2 is improved on the basis of the above embodiment. The technical contents disclosed in the above embodiment are not described repeatedly. The contents of the above disclosed embodiment also belong to the contents disclosed in the embodiment 2.

[0034] One embodiment of the utility model, combined with Figure 7 As shown, the drive assembly 7 includes an electric cylinder 706 horizontally arranged in the cavity of the mounting member 3, and a drive member 702 is arranged on the telescopic rod of the electric cylinder 706, and the drive member 702 is sleeved on the movable rod 5. The cooperation principle of the drive assembly 7 and the transmission member 4 of this embodiment is roughly the same as that of the embodiment 1, but its start and stop control part is mainly realized by the electric cylinder 706 itself. Compared with the drive assembly of the embodiment 1, this embodiment may control the adjustment of the chair back more quickly and conveniently, but in the long-term use process, after the high-frequency adjustment of the electric cylinder 706, the locking may produce a certain retreat, thereby causing the subsequent slight shaking of the chair back.

[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A back-chasing linkage mechanism, comprising a seat cushion (1) and a seat body (2), wherein the seat cushion (1) is mounted above the seat body (2), and is characterized in that: A mounting member (3) is provided in the cavity of the seat body (2), the mounting member (3) is movably connected to a transmission member (4), a driving assembly (7) is provided in the cavity of the mounting member (3), the driving assembly (7) is used to drive the transmission member (4) to move within a stroke, a backrest inner rod (8) is movably connected to the mounting member (3), an end of the backrest inner rod (8) is connected to the backrest body (10) via a rotating member, and the transmission member (4) is fixedly connected to the backrest body (10); The mounting member (3) and the transmission member (4) are matched with each other via a movable rod (5), and a guide groove (6) for guiding the movement trajectory of the movable rod (5) is provided on a side wall of the mounting member (3).

2. A chasing linkage mechanism according to claim 1, characterized in that: The driving assembly (7) is connected to the movable rod (5), and the driving assembly (7) drives the movable rod (5) to move in the guide groove (6) and fix the position.

3. A chasing linkage mechanism according to claim 2, characterized in that: The transmission member (4) is provided with a limit rod (9) for limiting the lowest position of the inner rod (8) of the chair back.

4. The catch-up linkage mechanism according to claim 3, characterized in that: The side wall of the mounting member (3) is provided with an embedded nut, the embedded nut being used for the subsequent installation of the movable rod (5) and the limiting rod (9).

5. The catch-up linkage mechanism according to claim 2, characterized in that: The driving assembly (7) comprises a pneumatic component (701) horizontally arranged in the cavity of the mounting component (3), a driving component (702) being arranged on the telescopic rod of the pneumatic component (701), and the driving component (702) being sleeved on the movable rod (5).

6. The catch-up linkage mechanism according to claim 5, characterized in that: An adjusting member (703) for controlling the displacement length of the telescopic rod of the pneumatic member (701) is arranged in the cavity of the pneumatic member (701); a pull cord (704) for controlling the start and stop of the adjusting member (703) is arranged on the adjusting member (703); a locking member (705) for controlling the retraction and extension length of the pull cord (704) is arranged at the end of the pull cord (704); the locking member (705) is fixedly arranged at the bottom of the seat body (2).

7. The catch-up linkage mechanism according to claim 5, characterized in that: The driving assembly (7) comprises an electric cylinder (706) horizontally arranged in the cavity of the mounting member (3), a driving member (702) being arranged on the telescopic rod of the electric cylinder (706), and the driving member (702) being sleeved on the movable rod (5).

8. The catch-up linkage mechanism according to claim 4, characterized in that: An embedded groove (11) is provided on the side wall of the inner seat back rod (8), and the embedded groove (11) is used for the inner seat back rod (8) to be placed at the lowest position so as to cooperate with the limiting rod (9).

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