Headrest adjustment mechanism for a multipurpose seat

Abstract

The utility model relates to a headrest adjusting mechanism of multipurpose seat, including chair frame and headrest, headrest is connected through swing component with the top of chair frame, swing component includes swing arm, sliding slot, limit seat and tension spring, limit seat is fixedly connected in chair frame, sliding slot is located in the back side of headrest, swing arm one end is hinged with limit seat, and the other end is slidingly connected with sliding slot, and the both ends of tension spring are connected with swing arm and limit seat respectively, and the upper clamping point and lower clamping point are equipped on limit seat, when the external force is applied to headrest, can drive swing arm to rotate around its hinged point with limit seat and slide along the extension direction of sliding slot, after loosening headrest, the elastic restoring force of tension spring can drive swing arm to abut on the upper clamping point or lower clamping point, and when swing arm abuts on the upper clamping point, headrest presents the state of being opened upward to expose the massage mechanism on chair frame, when swing arm abuts on the lower clamping point, headrest presents the state of being put down to the front side of the top of chair frame to form the shelter to massage mechanism. Can realize the convenient movement and positioning of headrest.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a headrest adjustment mechanism for a multi-purpose seat. Background Technology

[0002] Existing home chairs with massage functions generally suffer from a core problem: the massage mechanism requires its components (such as massage heads and rollers) to protrude from the surface of the seat back to achieve the massage effect. This results in the protruding massage mechanism being in direct contact with the human body when not massaging, causing a harsh and oppressive feel that fails to meet the user's need for relaxation and leisure, thus losing the comfortable experience of a regular sofa chair.

[0003] As a key component of the chair, the headrest should ideally be lifted during massage to allow the back to fully contact the exposed massage mechanism, ensuring the massage effect. When not massaging, the headrest should be lowered, using its soft surface to cover the raised massage mechanism and restore the comfortable feel of a lounge chair. However, existing solutions for this need all have drawbacks: either the headrest needs to be manually removed (cumbersome to operate, inconvenient to store, and easy to lose), or it relies on a motor to drive the headrest opening and closing (complex structure, high cost, and the electrical control components are prone to failure and difficult to maintain). There has never been a simple, low-cost design that can achieve the convenient switching of the headrest to "cover / expose the massage mechanism as needed." Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art by providing a headrest adjustment mechanism for a multi-purpose seat, which enables convenient movement and positioning of the headrest.

[0005] The technical solution of this utility model: A headrest adjustment mechanism for a multi-purpose chair, comprising a chair frame and a headrest. The headrest is connected to the top of the chair frame via a swing assembly. The swing assembly includes a swing arm, a slide groove, a limiting seat, and a tension spring. The limiting seat is fixed to the chair frame. The slide groove is located on the back of the headrest. One end of the swing arm is hinged to the limiting seat, and the other end is slidably engaged with the slide groove. The tension spring is connected at both ends to the swing arm and the limiting seat, respectively. The limiting seat is provided with an upper locking point and a lower locking point for limiting the position of the swing arm. When an external force is applied to the headrest, the locking point can cause the swing arm to rotate around the hinge point with the limiting seat and slide along the extension direction of the slide groove. When the headrest is released, the elastic restoring force of the tension spring can drive the swing arm to press against the upper or lower locking point to lock the position of the headrest. When the swing arm presses against the upper locking point, the headrest is in an upward-opening state to expose the massage mechanism on the chair frame. When the swing arm presses against the lower locking point, the headrest is lowered to the front of the top of the chair frame to cover the massage mechanism.

[0006] Using the above technical solution, users do not need to manually disassemble the headrest or rely on a complex motor drive system. They can easily switch between massage and non-massage modes with simple manual operation. When a massage is needed, manually applying an upward force to the headrest causes the swing arm to rotate around the hinge point and slide along the groove. The swing arm pulls the tension spring, and after the swing arm moves upward to a certain position, releasing the headrest allows the elastic restoring force of the tension spring to press the swing arm against the upper locking point, causing the headrest to flip upward and exposing the massage mechanism to ensure the massage effect. When not massaging, manually applying a downward force to the headrest similarly causes the swing arm to rotate and slide, pulling the tension spring. After the swing arm moves downward to a certain position, releasing the headrest allows the tension spring to press the swing arm against the lower locking point, lowering the headrest to the front of the top of the chair frame, concealing the protruding massage mechanism and restoring the comfortable feel of the lounge chair. This design is not only simple in structure and low in cost, but also convenient to operate and maintain, effectively solving the problem of not being able to balance function and comfort in existing technologies.

[0007] A further feature of this invention is that the slide groove is a T-shaped groove, and an upper limit member and a lower limit member are respectively configured at both ends of the T-shaped groove. The swing arm is provided with a guide post, which is slidably disposed in the T-shaped groove and forms a sliding stroke limit through the upper limit member and the lower limit member.

[0008] By adopting the above-mentioned further settings, the sliding trajectory of the swing arm can be controlled more precisely through the cooperation of the T-slot and the guide post, ensuring that the swing arm will not deviate or wobble during movement, thus improving the stability of the entire headrest switching state. At the same time, the setting of the upper and lower limit components clearly limits the sliding stroke of the swing arm, avoiding the problem of the swing arm damaging the components due to excessive sliding or failing to accurately reach the locking point, further ensuring the accuracy and reliability of the headrest switching between massage and non-massage states.

[0009] A further feature of this invention is that the slide groove is formed on the track platform, and the track platform is fixed to the headrest side. The upper limit member is integrally formed on the upper end of the track platform, and the lower limit member corresponds to the lower end of the track platform and is connected to the headrest side by screws. The lower end of the track platform has a notch adapted to the lower limit member.

[0010] By further configuring the above-mentioned features, the connection between the entire slide and the headrest is made more stable by fixing the track platform to the headrest back side. The upper limit component is integrated into the upper part of the track platform, which enhances the overall integrity and stability of the structure and simplifies the installation process. The lower limit component is connected to the headrest back side by screws, and a notch is opened at the lower end of the track platform to match the lower limit component. This design not only facilitates the installation and disassembly of the lower limit component, but also ensures the precise fit between the lower limit component and the track platform, thereby more effectively limiting the sliding stroke of the swing arm and ensuring the stability and reliability of the headrest during state switching.

[0011] A further feature of this invention is that the chair frame has a recessed cavity on its side, and the surface of the chair frame has a swing channel communicating with the recessed cavity. The swing channel extends from the front side of the top of the chair frame to its top surface. The limiting seat and the tension spring are both assembled in the recessed cavity, and the swing arm is movably inserted into the swing channel.

[0012] By adopting the above-mentioned further design, a recessed cavity is opened on the side of the chair frame, and a swing channel communicating with the recessed cavity is set on the surface of the chair frame, providing a reasonable spatial layout for the movement of the swing arm; the swing channel extends from the front side of the top of the chair frame to its top surface, and this unique design allows the swing arm to swing flexibly within a specific range; the limit seat and tension spring are assembled in the recessed cavity, which not only ensures the installation stability of these key components, but also makes full use of the internal space of the chair frame, making the overall structure more compact.

[0013] A further feature of this invention is that both the limiting seat and the swing arm are provided with tension spring hanging posts, and the two ends of the tension spring are respectively hung on the two tension spring hanging posts.

[0014] By further modifying the above-mentioned design, by setting tension spring hanging posts on the limit seat and the swing arm, and hanging the two ends of the tension spring on the two tension spring hanging posts respectively, the installation and disassembly of the tension spring are made more convenient, while also ensuring the stability and reliability of the tension spring during operation.

[0015] A further feature of this invention is that the swing arm and the limiting seat are hinged by bolts, and a gasket is provided between the swing arm and the limiting seat.

[0016] With the above-mentioned further configuration, the swing arm and the limit seat are connected by bolts. The bolts provide a stable rotation axis, and the tightness of the hinge can be controlled by locking the nut, thus meeting the requirements of "rotatability" and "secure assembly". The setting of the gasket effectively reduces the friction and wear between the swing arm and the limit seat, extends the service life of the components, and also improves the stability and smoothness of the swing.

[0017] A further feature of this invention is that the swing components are configured as two sets, and are symmetrically assembled on both sides of the chair frame.

[0018] By adopting the above-mentioned further configuration, and by setting the swing components as two sets and symmetrically assembling them on both sides of the chair frame, this layout can make the chair frame more evenly stressed during state switching, effectively avoiding the problem of chair frame tilting or swaying caused by unilateral stress, and further improving the stability and reliability of the entire device during state switching. Attached Figure Description

[0019] Figure 1 This is a structural diagram of a sofa chair according to a specific embodiment of the present utility model; Figure 2 for Figure 1 Structure diagram of the swing component; Figure 3 This is a structural diagram of a massage chair according to a specific embodiment of the present utility model; Figure 4 for Figure 3 Structure diagram of the swing component; Figure 5 This is a structural diagram of the swing component according to a specific embodiment of the present utility model; Figure 6 This is a diagram showing the installation of the slide groove according to a specific embodiment of the present utility model; Figure 7 This is a structural diagram of the slide groove according to a specific embodiment of the present utility model; Figure 8 This is a diagram showing the installation of a tension spring according to a specific embodiment of the present invention. Detailed Implementation

[0020] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1-8 As shown, the headrest adjustment mechanism of this utility model for a multi-purpose chair includes a chair frame 1 and a headrest 2. The inner core of the headrest 2 is made of sponge, down, or latex, etc. The headrest 2 is connected to the top of the chair frame 1 via a swing assembly 3. The swing assembly 3 includes a swing arm 31, a slide groove 32, a limiting seat 33, and a tension spring 34. The limiting seat 33 is fixed to the chair frame 1 and is connected to the chair frame 1 by screws or integrally. The slide groove 32 is located on the back of the headrest 2. One end of the swing arm 31 is hinged to the limiting seat 33, and the other end is slidably engaged with the slide groove 32. The swing arm 31 and the limiting seat 33 are hinged by bolts 36, and a washer 37 is provided between the swing arm 31 and the limiting seat 33. The two ends of the tension spring 34 are respectively connected to the swing arm 31 and the limiting seat 33. Both the limiting seat 33 and the swing arm 31 are provided with tension spring hanging posts 35, and the two ends of the tension spring 34 are respectively hung on the two tension spring hanging posts 35. The limiting seat 31... The headrest 2 is provided with an upper locking point 331 and a lower locking point 332 for limiting the position of the swing arm. The locking point is a convex plate structure. When an external force is applied to the headrest, the swing arm 31 can rotate around the hinge point between itself and the limiting seat 33 and slide along the extension direction of the slide groove 32. When the headrest is released, the elastic restoring force of the tension spring 34 can drive the swing arm 31 to press against the upper locking point 331 or the lower locking point 332 to lock the position of the headrest 2. When the swing arm 31 presses against the upper locking point 331, the headrest 2 is in an upward flipped state so that the massage mechanism 4 on the chair frame 1 is exposed. When the swing arm 31 presses against the lower locking point 332, the headrest 2 is in a state of being lowered to the front of the top of the chair frame 1 to cover the massage mechanism 4. The massage mechanism is a conventional structure and will not be described in detail. The slide groove 32 is a T-shaped groove, with an upper limit member 322 and a lower limit member 323 respectively configured at both ends. The swing arm 31 is provided with a guide post 311, which is slidably disposed in the T-shaped groove and forms a sliding stroke limit through the upper limit member 322 and the lower limit member 323. The slide groove is opened on the track platform 324, and the track platform 324 is fixed to the back side of the headrest 2 by screws. The upper limit member 322 is integrally disposed on the upper end of the track platform 324, and the lower limit member 323 corresponds to the lower end of the track platform 324 and is connected to the back side of the headrest 2 by screws 325. The lower end of the track platform 324 has a notch 3241 adapted to the lower limit member. The chair frame 1 has a recessed cavity 11 on its side, and the surface of the chair frame 1 has a swing channel 12 that communicates with the recessed cavity. The swing channel 12 extends from the front side of the top of the chair frame 1 to its top surface. The limiting seat 33 and the tension spring 34 are both assembled in the recessed cavity 11, and the swing arm 31 is movably inserted into the swing channel 12.

[0022] Specifically, the swing assembly 3 is provided in two sets and symmetrically assembled on both sides of the chair frame 1. Two sets of sliding grooves 32 are provided on the back of the headrest, and limiting seats are provided on both sides of the chair frame 1.

[0023] The headrest adjustment mechanism in this invention achieves switching between two headrest positions through "swing component transmission + tension spring reset locking". Switching from sofa mode to massage chair mode: When the user applies an upward force to the headrest, the force overcomes the restoring force of the tension spring, causing the swing arm to rotate upward around the hinge point with the limiting seat. At the same time, the guide post at the other end of the swing arm slides along the sliding groove on the side of the headrest back. The headrest gradually lifts upward with the movement of the swing arm. When the swing arm rotates to the upper locking point of the limiting seat, the user releases the headrest, and the elastic restoring force of the tension spring takes effect, driving the swing arm to press against the upper locking point. The headrest remains in the upward-lifted state, and the massage mechanism on the chair frame is exposed, allowing the massage function to be used normally. At this time, it is a massage chair. When the user applies a downward force to the headrest, the force overcomes the restoring force of the tension spring, causing the swing arm to rotate downward around the hinge point with the limiting seat. At the same time, the guide post at the other end of the swing arm slides along the side groove of the headrest back. The headrest gradually lowers with the movement of the swing arm. When the swing arm rotates to the lower locking point of the limiting seat, the user releases the headrest, and the elastic restoring force of the tension spring takes effect, driving the swing arm to press against the lower locking point. The headrest is positioned at the front of the top of the chair frame and covers the protruding massage mechanism. At this time, it is a sofa chair.

[0024] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A headrest adjustment mechanism for a multi-purpose chair, comprising a chair frame (1) and a headrest (2), characterized in that: The headrest (2) is connected to the top of the chair frame (1) via a swing assembly (3). The swing assembly (3) includes a swing arm (31), a slide groove (32), a limiting seat (33), and a tension spring (34). The limiting seat (33) is fixed to the chair frame (1). The slide groove (32) is located on the back of the headrest (2). One end of the swing arm (31) is hinged to the limiting seat (33), and the other end is slidably engaged with the slide groove (32). The tension spring (34) connects the swing arm (31) and the limiting seat (33) at both ends, respectively. The limiting seat (33) is provided with an upper locking point (331) and a lower locking point (332) for limiting the position of the swing arm, thus applying external force to the headrest. When the headrest is released, the swing arm (31) can rotate around the hinge point between itself and the limiting seat (33) and slide along the extension direction of the slide groove (32). When the headrest is released, the elastic restoring force of the tension spring (34) can drive the swing arm (31) to press against the upper locking point (331) or the lower locking point (332) to lock the position of the headrest (2). When the swing arm (31) presses against the upper locking point (331), the headrest (2) is in an upward lifting state so that the massage mechanism (4) on the chair frame (1) is exposed. When the swing arm (31) presses against the lower locking point (332), the headrest (2) is in a state of being lowered to the front of the top of the chair frame (1) to block the massage mechanism (4).

2. The headrest adjustment mechanism according to claim 1, characterized in that: The slide groove (32) is a T-shaped groove, and the upper limit member (322) and the lower limit member (323) are respectively configured at both ends of the T-shaped groove. The swing arm (31) is provided with a guide post (311). The guide post (311) is slidably disposed in the T-shaped groove and forms a sliding stroke limit through the upper limit member (322) and the lower limit member (323).

3. The headrest adjustment mechanism according to claim 2, characterized in that: The groove is provided on the track platform (324), and the track platform (324) is fixed to the back of the headrest (2). The upper limit member (322) is integrally provided on the upper end of the track platform (324). The lower limit member (323) corresponds to the lower end of the track platform (324) and is connected to the back of the headrest (2) by screws (325). The lower end of the track platform (324) is provided with a notch (3241) that matches the lower limit member.

4. The headrest adjustment mechanism according to claim 1, 2, or 3, characterized in that: The chair frame (1) has a recessed cavity (11) on its side, and the surface of the chair frame (1) has a swing channel (12) communicating with the recessed cavity. The swing channel (12) extends from the front side of the top of the chair frame (1) to its top surface. The limiting seat (33) and the tension spring (34) are both assembled in the recessed cavity (11), and the swing arm (31) is movably inserted in the swing channel (12).

5. The headrest adjustment mechanism according to claim 1, 2, or 3, characterized in that: Both the limiting seat (33) and the swing arm (31) are provided with tension spring hanging posts (35), and the two ends of the tension spring (34) are respectively hung on the two tension spring hanging posts (35).

6. The headrest adjustment mechanism according to claim 1, 2, or 3, characterized in that: The swing arm (31) and the limiting seat (33) are hinged by bolts (36), and a gasket (37) is provided between the swing arm (31) and the limiting seat (33).

7. The headrest adjustment mechanism according to claim 1, 2, or 3, characterized in that: The swing assembly (3) is configured as two sets and symmetrically assembled on both sides of the chair frame (1).

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