Locking assembly and four-way movement headrest mechanism

Abstract

The application discloses a locking assembly and a four-way moving headrest mechanism. The locking assembly is suitable for the four-way moving headrest mechanism. The four-way moving headrest mechanism comprises a moving mechanism framework, two headrest rods and two front and rear guide rods connected with the moving mechanism framework. The locking assembly is connected with the moving mechanism framework. The locking assembly comprises a manual locking strip, a first locking piece and a second locking piece. The manual locking strip is movably arranged on the outer wall of the moving mechanism framework. The first locking piece is rotatably connected with the moving mechanism framework and is connected with the manual locking strip in linkage. The first locking piece is clamped into or separated from the headrest rod by swinging around a fixed axis, so as to realize the locking or unlocking of the movement of the moving mechanism framework. The manual locking strip is provided with an avoiding hole for the front and rear guide rods to pass through. The second locking piece is connected with the manual locking strip and is translated to be clamped into or separated from the front and rear guide rods along with the movement of the manual locking strip, so as to realize the locking or unlocking of the movement of the front and rear guide rods.

Description

Technical Field

[0001] This application relates to the field of headrest supports, and more specifically to a locking component and a four-way motion headrest mechanism. Background Technology

[0002] With the increasing demand for car seat comfort, four-way adjustable headrests—height adjustment and fore-aft adjustment—have become mainstream features. Currently, four-way adjustable headrest mechanisms in the industry are mainly divided into two types: manual and electric.

[0003] For manually adjustable four-way headrests, for example, Chinese patent application CN118876838A provides a manually adjustable four-way headrest, which discloses a manually adjustable four-way structure. This structure uses a locking bar with a square cross section to move along a specific trajectory in the guide channel of the inner lining block, thereby realizing the synchronous unlocking and locking control of the headrest rod (up and down adjustment) and the guide column (forward and backward adjustment), thus completing the four-way adjustment action of the headrest.

[0004] However, the locking bar and guide post of the above-mentioned square structure require a large space for the locking bar to move and adjust, and the fit is weak. When the locking bar moves in the guide channel of the inner liner block, it will wobble relative to the inner liner block during the locking and unlocking adjustment process, resulting in poor stability. Utility Model Content

[0005] The purpose of this application is to provide a locking component and a four-way motion headrest mechanism to improve the stability during the headrest adjustment process.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A locking assembly is provided, applicable to a four-way motion headrest mechanism. The four-way motion headrest mechanism includes a motion mechanism frame, two headrest rods and two front and rear guide rods connected to the motion mechanism frame. The locking assembly is connected to the motion mechanism frame and includes: a manual locking bar, a first locking member, and a second locking member. The manual locking bar is movably disposed on the outer wall of the motion mechanism frame. The first locking member is rotatably connected to the motion mechanism frame and linked with the manual locking bar. The first locking member swings around a fixed axis to engage or disengage from the headrest rods, thereby locking or unlocking the movement of the motion mechanism frame. The manual locking bar has clearance holes for the front and rear guide rods to pass through. The second locking member is connected to the manual locking bar and moves with the manual locking bar to engage or disengage from the front and rear guide rods, thereby locking or unlocking the movement of the front and rear guide rods.

[0007] In related technologies, headrest movement mechanisms often employ a rectangular locking strip in conjunction with guide posts to achieve the locking function. This locking structure is typically housed within a plastic inner liner. However, since the inner liner is an injection-molded part, integral molding makes it difficult to guarantee high-precision dimensions. Furthermore, to facilitate the movement of the rectangular locking strip and guide posts within the channel, draft angles must be incorporated into the mold for the rectangular channel. Without draft angles, the rectangular locking strip or guide posts will be stuck together on all four sides within the channel, resulting in jamming. If draft angles are incorporated, significant assembly gaps will exist between the channel cross-section and the locking strip and guide posts. These gaps can easily cause the headrest to wobble during adjustment, affecting the feel and structural stability. This problem is inherent to the multi-faceted contact characteristics of the plastic parts and is difficult to completely avoid.

[0008] Meanwhile, the locking strip arrangement used in the related technology, which involves a transverse penetrating inner liner block, and the use of a multi-tooth meshing locking method for both the headrest rod and the guide post, often causes the end of the locking strip to protrude significantly from the inner liner block during the unlocking or locking process. This results in low overall structural space utilization and a large space occupation.

[0009] Therefore, to address the aforementioned problems, this application proposes the following structural improvements. First, the manual locking bar is positioned on the outer wall of the motion mechanism frame, rather than within an internal channel. This manual locking bar is externally mounted, and its dimensions can be precisely controlled through machining. There is no need to create a rectangular movement channel within the motion mechanism frame, thus fundamentally avoiding the fit clearance caused by draft angles and significantly improving assembly accuracy and operational stability. Furthermore, the manual locking bar is equipped with clearance holes for the front and rear guide rods to pass through. This structure not only serves a guiding function but also limits the travel of the manual locking bar, preventing over-adjustment and improving the precision of locking and unlocking actions.

[0010] This application document unlocks the headrest bar by swinging the first locking member, replacing the long-stroke translational movement of the locking bar in related technologies; the swing-type unlocking mechanism effectively reduces the space required for operation, making the overall layout of the locking structure more compact and significantly improving the space utilization efficiency of the mechanism.

[0011] Preferably, the four-way motion headrest mechanism further includes a guide block; the guide block is disposed between the motion mechanism frame and the headrest rod, and / or between the motion mechanism frame and the front and rear guide rods, and the inner wall of the guide block is provided with a rib, and the guide block contacts and abuts against the headrest rod and / or the front and rear guide rods through the rib.

[0012] To reduce the clearance between the headrest rod and the front and rear guide rods and the motion mechanism frame, this application includes an independent guide block between them. This guide block, acting as an intermediate guide component, engages with both the rods and the motion mechanism frame. To enhance connection strength, both the front and rear guide rods and the headrest rod can be made of metal. The guide block not only avoids direct friction between the metal rods and the plastic frame but also effectively eliminates clearance during movement, preventing swaying. Furthermore, the use of metal rods further improves the overall structural strength and wear resistance.

[0013] As a preferred embodiment, the manual locking bar is provided with an operating part for user operation; the first locking member is linked with the manual locking bar and has a first working position for locking or unlocking the movement of the motion mechanism frame relative to the headrest rod; the second locking member is linked with the manual locking bar and has a second working position for locking or unlocking the movement of the front and rear guide rods; by operating the manual locking bar through the operating part, the first locking member and the second locking member can be simultaneously driven to switch between their respective working positions to the locked or unlocked state.

[0014] As another preferred embodiment, two headrest rods are arranged in parallel, and the two headrest rods are connected by a first connector to achieve synchronous positioning; two front and rear guide rods are arranged in parallel, and the two front and rear guide rods are connected by a second connector to achieve synchronous movement; a first locking member acts on one of the headrest rods to achieve synchronous locking or unlocking of the two headrest rods; a second locking member acts on one of the front and rear guide rods to achieve synchronous locking or unlocking of the two front and rear guide rods.

[0015] Further preferably, the headrest rod includes a first headrest rod and a second headrest rod, and the front and rear guide rods include a first front and rear guide rod and a second front and rear guide rod; the first headrest rod and the first front and rear guide rod are located on the same side of the motion mechanism frame, and the second headrest rod and the second front and rear guide rod are located on the other side of the motion mechanism frame; a first locking member is provided corresponding to and acts on the second headrest rod; a second locking member is provided corresponding to and acts on the first front and rear guide rod, and thus the first locking member and the second locking member are staggered on the motion mechanism frame.

[0016] Preferably, the headrest rod is provided with a first gear groove; the first locking member includes a rotating shaft, a connecting rod, and a first elastic member; the rotating shaft is fixed to the motion mechanism frame, one end of the connecting rod is oscillatingly connected to the rotating shaft, and the other end is connected to the manual locking bar; the motion mechanism frame is provided with a limiting hole to limit the swing range of the connecting rod; one end of the first elastic member is connected to the manual locking bar, and the other end is connected to the motion mechanism frame, and the first elastic member provides elastic force to the manual locking bar to make it tend to drive the connecting rod into the first gear groove; wherein, pressing the operating part can drive the connecting rod to overcome the elastic force of the first elastic member and swing around the rotating shaft, thereby disengaging the connecting rod from the first gear groove to achieve unlocking.

[0017] Preferably, the front and rear guide rods are provided with a second position groove; the second locking member includes a locking plate and a second elastic member; one end of the locking plate is connected to the manual locking bar, and the other end is engaged with the second position groove; one end of the second elastic member is connected to the manual locking bar, and the other end is connected to the motion mechanism frame, and the second elastic member provides elastic force to the manual locking bar so that it tends to drive the locking plate to remain engaged in the second position groove; pressing the operating part can drive the manual locking bar to drive the locking plate to move against the elastic force of the second elastic member, thereby disengaging from the second position groove to achieve unlocking.

[0018] Key locking components in the locking assembly, such as the connecting rod for locking the headrest bar and the locking plate for forward and backward locking, are all independently machined metal parts, assembled in a modular manner onto the locking bar and the motion mechanism frame. This modular design ensures high fitting precision while facilitating later maintenance and parts replacement. The overall structure is compact, highly reliable, and effectively suppresses shaking during adjustment.

[0019] Preferably, the motion mechanism frame has a pre-set motor mounting position, and the locking component avoids the motor mounting position, so that when the motion mechanism frame is equipped with a motor, it can realize electric locking of the headrest rod and the front and rear guide rods, and the locking component can be used to achieve the sharing of the motion mechanism frame.

[0020] Further preferably, the second connecting member includes a first arc segment, a second arc segment, and a straight segment connecting the two arc segments; the first arc segment, the second arc segment, and the straight segment together form an arc-shaped recessed structure that is concave downward relative to the front and rear guide rods; the arc-shaped recessed structure avoids the motor mounting position on the motion mechanism frame.

[0021] Preferably, the locking assembly further includes a limiting cover plate, which is connected to the motion mechanism frame. Both the manual locking strip and the limiting cover plate are sheet-like structures. The manual locking strip and the limiting cover plate are stacked sequentially and disposed on the outside of the motion mechanism frame. The limiting cover plate encapsulates the manual locking strip between itself and the motion mechanism frame. The operating part of the manual locking strip is exposed through the limiting cover plate for operation.

[0022] Furthermore, this application also provides a four-way motion headrest mechanism, including: a motion mechanism frame, a headrest rod, front and rear guide rods, and a locking component as described above. The headrest rod is connected to the motion mechanism frame, and the motion mechanism frame can move vertically relative to the headrest rod. The front and rear guide rods are connected to the motion mechanism frame and can move back and forth relative to the motion mechanism frame. The locking component is movably connected to the motion mechanism frame. One end of the locking component is disposed corresponding to the headrest rod and is used to unlock or lock the vertical movement of the motion mechanism frame relative to the headrest rod. The other end of the locking component is disposed corresponding to the front and rear guide rods and is used to unlock or lock the movement of the front and rear guide rods.

[0023] Therefore, compared with the prior art, the beneficial effects of this application are as follows: the manual locking strip is set on the outer wall of the motion mechanism frame, rather than in the built-in channel. The manual locking strip adopts an external installation, and its external dimensions can be precisely controlled by machining. There is no need to open a rectangular moving channel in the motion mechanism frame, thereby fundamentally avoiding the fitting gap caused by the draft angle and significantly improving the assembly accuracy and operational stability.

[0024] Meanwhile, this application document unlocks the headrest bar position by swinging the first locking member, replacing the long-stroke translational movement of the locking bar in related technologies; the swing-type unlocking mechanism effectively reduces the space required for operation, making the overall layout of the locking structure more compact and significantly improving the space utilization efficiency of the mechanism. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the four-way motion headrest mechanism from an isometric perspective.

[0026] Figure 2 This is a schematic diagram of the four-way motion headrest mechanism from another isometric perspective.

[0027] Figure 3 This is a schematic diagram of the four-way motion headrest mechanism from the main view.

[0028] Figure 4 This is a schematic diagram of the four-way motion headrest mechanism from the rear view.

[0029] Figure 5 This is a schematic diagram of the four-way motion headrest mechanism from a side view.

[0030] Figure 6 This is a structural diagram of the four-way motion headrest mechanism that hides the motion mechanism skeleton and other components.

[0031] Figure 7 This is a structural diagram showing the position of the first locking element.

[0032] Figure 8 This is a schematic diagram of the structure from an isometric view of the position of the first locking element.

[0033] Figure 9 This is a structural schematic diagram from another isometric view of the position of the first locking element.

[0034] Figure 10 This is a schematic diagram of the linkage swinging.

[0035] Figure 11 This is a structural diagram showing the connection point between the connecting rod and the manual locking bar.

[0036] Figure 12 This is a structural diagram showing the position of the second locking element.

[0037] Figure 13 This is a cross-sectional view of the connection point between the guide block and the headrest.

[0038] Figure 14 This is a schematic diagram of the guide block.

[0039] In the diagram: 1. Four-way motion headrest mechanism; 2. Motor; 10. Motion mechanism frame; 11. Motor mounting position; 12. Limiting hole; 20. Headrest rod; 21. First connecting piece; 22. First headrest rod; 23. Second headrest rod; 24. First stop groove; 30. Front and rear guide rods; 31. Second connecting piece; 311. First arc-shaped segment; 312. Second arc-shaped segment; 313. Straight segment; 314. Arc-shaped recessed structure; 32. First front and rear guide rods; 33. Second front and rear guide rods. 34. Guide rod; 40. Second position groove; 41. Locking assembly; 42. Manual locking bar; 43. Operating part; 44. First locking element; 45. Rotating shaft part; 46. Connecting rod; 47. First elastic element; 48. Floating space; 49. Protrusion; 40. Second locking element; 41. Clamping plate; 42. Second elastic element; 43. First working position; 44. Second working position; 45. Limiting cover plate; 66. Headrest panel; 77. Guide block; 88. Rib. Detailed Implementation

[0040] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0041] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0042] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0043] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0044] In a preferred embodiment, this application provides a four-way motion headrest mechanism 1, see [link to previous document]. Figure 4 and Figure 5 It includes: a motion mechanism frame 10, a headrest rod 20, and front and rear guide rods 30. The headrest rod 20 is connected to the motion mechanism frame 10, and the motion mechanism frame 10 can move relative to the headrest rod 20 in the vertical direction. Figure 4 and Figure 5 The front and rear guide rods 30 are connected at one end to the motion mechanism frame 10 and at the other end to the headrest panel 50. The movement of the front and rear guide rods 30 relative to the motion mechanism frame 10 causes the headrest panel 50 to move in the front-rear direction, with the direction of movement corresponding to the vertical direction. Figure 5 The left and right directions in the middle.

[0045] Among them, the four-way motion headrest mechanism 1 is suitable for vehicle headrests. The motion mechanism frame 10 is covered with a flexible material, and the headrest rod 20 provides support. The motion mechanism frame 10 can be moved up and down relative to the headrest rod 20 to adjust the height of the headrest. Similarly, the front and rear guide rods 30 are covered with a flexible material, and the front and rear guide rods 30 can be moved back and forth relative to the motion mechanism frame 10. With the position adjustment of the motion mechanism frame 10, the four-way adjustment of the headrest can be realized.

[0046] In actual manufacturing, depending on user needs, the four-way adjustable headrest is further divided into manual and electric adjustment. Manual adjustment, as the name suggests, does not involve installing a motor or other driving components in the headrest. Users adjust the height and fore-aft distance of the headrest by pressing or pushing it. The advantages are simple structure, lightweight, not easily damaged, and convenient maintenance. The electric adjustable four-way headrest structure incorporates a motor or other driving components in the motion mechanism frame 10. The motor or other driving components drive the motion mechanism frame 10 and the front and rear guide rods 30 to move. No manual adjustment is required from the user; only command input is needed, which optimizes the user experience.

[0047] Since car manufacturers decide whether to use electrically adjustable headrests or manually adjustable headrests based on their product positioning when assembling headrests, the four-way motion headrest mechanism 1 provided in this application is based on the product supply side. From the product supply side, the structures of the electrically adjustable headrest mechanism and the manually adjustable headrest mechanism are different. Making a separate mold for either adjustment method will increase costs. Therefore, this application provides a four-way motion headrest mechanism 1 that can be used for both electric and manual adjustment. This allows car manufacturers to choose between an electric adjustment scheme or a manual adjustment scheme in the four-way motion headrest mechanism 1 according to their actual usage needs, or for both electric and manual adjustment schemes to coexist in the four-way motion headrest mechanism 1 provided in this application, thereby reducing costs and increasing efficiency, and adapting to more usage scenarios.

[0048] For this, see Figures 1 to 14 The four-way motion headrest mechanism 1 also includes a locking component 40, which is connected to the motion mechanism frame 10. One end of the locking component 40 is set corresponding to the headrest rod 20 and is used to unlock or lock the vertical movement of the motion mechanism frame 10 relative to the headrest rod 20. The other end of the locking component 40 is set corresponding to the front and rear guide rods 30 and is used to unlock or lock the front and rear guide rods 30 relative to the motion mechanism frame 10. The motion mechanism frame 10 has a motor mounting position 11. The locking component 40 avoids the motor mounting position 11 so that when the motion mechanism frame 10 is equipped with a motor 2, it can realize the electric locking of the headrest rod 20 and the front and rear guide rods 30. The locking component 40 is used to achieve the sharing of the motion mechanism frame 10.

[0049] It should be noted that the locking component 40 provided corresponds to manual adjustment, while the motor mounting position 11 preset on the motion mechanism frame 10 corresponds to electric adjustment. The specific method of electric adjustment is simply to install a motor 2 on the motion mechanism frame 10, and drive the motor 2 to the headrest rod 20 and the front and rear guide rods 30. Therefore, the specific operation method of electric adjustment of the headrest position by motor 2 will not be described in detail here, but only how to reasonably set the motor 2 will be publicly explained.

[0050] Therefore, see details. Figures 1 to 5For the motion mechanism frame 10, preferably, the motor mounting position 11 is located in the middle of the motor 2 motion frame to ensure that the motor 2 is relatively stable after being assembled into the motor 2 motion frame. Correspondingly, the locking component 40 is located in the lower part of the motor 2 motion frame to avoid the motor mounting position 11. This ensures that the locking component 40 will not interfere with the preset space of the motor mounting position 11 during unlocking or locking. The locking component 40 can independently lock or unlock the headrest rod 20 in the vertical direction and the front and rear guide rods 30 in the front and rear direction without occupying the space of the motor mounting position 11. The manual adjustment function is not affected. When the motor 2 is assembled, the motor 2 works independently in the middle and can be driven by the motor 2 to achieve electric locking. The lower locking component 40 can still operate normally. The two do not overlap in space and do not interfere with each other in action. This can effectively avoid the problem of manual and electric functions not being able to coexist due to the spatial interference of components, and provide a structural basis for a frame to be compatible with two adjustment methods.

[0051] Meanwhile, since the spatial layout of the motor mounting position 11 and the locking component 40 is fixed and does not conflict, the mold of the same set of motion mechanism skeleton 10 does not need to be structurally modified for manual or electric adjustment, and there is no need to redesign the skeleton shape or adjust the mounting hole position of the locking component 40. It is only necessary to decide whether to assemble the motor 2 to achieve the switching between the two configurations, and complete the structural sharing of motor 2 adjustment and manual adjustment. Thus, for the supply side, the mold development cost is reduced, the production process is simplified, and cost reduction and efficiency improvement are achieved, which can be used in a variety of scenarios and working conditions.

[0052] As a preferred option, see Figure 6 The locking assembly 40 includes a manual locking bar 41, a first locking member 42, and a second locking member 43. The manual locking bar 41 is movably mounted on the motion mechanism frame 10 and has an operating part 411 for user operation. The manual locking bar 41 is an unlocking slider structure and is slidably connected to the motion mechanism frame 10. The first locking member 42 is linked with the manual locking bar 41 and has a first working position 44 for locking or unlocking the motion mechanism frame 10 relative to the headrest rod 20. The second locking member 43 is linked with the manual locking bar 41 and has a second working position 45 for locking or unlocking the movement of the front and rear guide rods 30. The manual locking bar 41 has a clearance hole for the front and rear guide rods 30 to pass through. Figure 6 The opening is shown at the second working position 45; by operating the manual locking bar 41 through the operating part 411, the first locking member 42 and the second locking member 43 can be simultaneously driven to switch between their respective working positions to the locked or unlocked state.

[0053] In this application, the manual locking bar 41 is used as a common transmission carrier to link the first locking member 42 and the second locking member 43 with the same operating carrier. This eliminates the need to set up separate operating levers or transmission structures for the two locking members, significantly reducing the overall volume occupied by the locking assembly 40. At the same time, combined with the preset area of ​​the motor mounting position 11, the motor mounting position 11 is preferably located in the middle of the frame and the locking assembly 40 is located in the lower part of the frame. This further avoids spatial interference between the locking assembly 40 and the motor 2, and provides more sufficient installation space for other components inside the headrest, such as cushioning materials and the motor 2, which is in line with the design trend of lightweight and miniaturized headrests.

[0054] As another preferred embodiment, two headrest rods 20 are arranged in parallel, and the two headrest rods 20 are connected by a first connector 21 to achieve synchronous positioning. The first connector 21 is a connecting bracket, and specifically a rod structure. Two front and rear guide rods 30 are arranged in parallel, and the two front and rear guide rods 30 are connected by a second connector 31 to achieve synchronous movement. The second connector 31 is also preferably a rod structure. A first locking member 42 acts on one of the headrest rods 20 to achieve synchronous locking or unlocking of the two headrest rods 20. A second locking member 43 acts on one of the front and rear guide rods 30 to achieve synchronous locking or unlocking of the two front and rear guide rods 30.

[0055] Specifically, for the four-way motion headrest mechanism 1, multiple headrest rods 20 are provided to ensure the movement stability of the motion mechanism frame 10. Similarly, multiple front and rear guide rods 30 are provided to ensure that the headrest panel 50, after being covered with a flexible material, has a stable movement stroke relative to the motion mechanism frame 10. Therefore, in this application, two headrest rods 20 are preferably provided, distributed on both sides of the motion mechanism frame 10. The front and rear guide rods 30 correspond to the positions of the headrest rods 20 and are also provided in pairs. Thus, in this application, the two parallel rods are integrated into a single synchronous unit through the rigid connection of the first connecting member 21 and the second connecting member 31, ensuring that the displacement and movement speed of the two rods are completely consistent. At the same time, by using the first locking member 42 to act on one headrest rod 20 and the second locking member 43 to act on one front and rear guide rod 30, the overall locking or unlocking of the synchronous unit can be achieved by means of the force transmission of the connecting members.

[0056] Further preferably, the headrest rod 20 includes a first headrest rod 22 and a second headrest rod 23, and the front and rear guide rods 30 include a first front and rear guide rod 32 and a second front and rear guide rod 33; the first headrest rod 22 and the first front and rear guide rod 32 are located on the same side of the motion mechanism frame 10, and the second headrest rod 23 and the second front and rear guide rod 33 are located on the other side of the motion mechanism frame 10; the first locking member 42 is provided and acts on the second headrest rod 23; the second locking member 43 is provided and acts on the first front and rear guide rod 32, and thus the first locking member 42 and the second locking member 43 are staggered on the motion mechanism frame 10.

[0057] Only two locking components are needed: the first locking component 42 and the second locking component 43, which can achieve synchronous locking of the first headrest rod 22 and the second headrest rod 23, and synchronous locking of the first front and rear guide rods 32 and the second front and rear guide rods 33. By reducing the number of locking components, both mold development costs can be reduced and the assembly process can be simplified.

[0058] Meanwhile, the headrest interior must simultaneously accommodate the motion mechanism frame 10, double headrest rods 20, double front and rear guide rods 30, and locking assembly 40. In some practical scenarios, the motor 2 also needs to be installed within the motor mounting position 11, making the space extremely compact. The dual locking mechanism controlling the double rods in related technologies occupies more lateral space and is prone to interference with the motor mounting position 11 and the headrest cushioning material, limiting the compatibility of manual and electric functions. However, this application uses a single locking mechanism to control the double rods, thereby effectively reducing the lateral space occupied by the locking assembly 40. Combined with the layout of the locking assembly 40 located at the lower part of the frame and the motor mounting position 11 located in the middle, the internal space of the headrest is further freed up. This avoids spatial conflicts between the locking assembly 40 and the motor 2, and also reserves more space for the filling of the cushioning material to adapt to the design requirements of different vehicle configurations.

[0059] For further optimization, see [link to relevant documentation]. Figure 2 , Figure 3 and Figure 5 The second connecting member 31 includes a first arc segment 311, a second arc segment 312, and a straight segment 313 connecting the two arc segments; the first arc segment 311, the second arc segment 312, and the straight segment 313 together form an arc-shaped recessed structure 314 that is recessed downward relative to the front and rear guide rods 30; the arc-shaped recessed structure 314 avoids the motor mounting position 11 on the motion mechanism frame 10.

[0060] The arc-shaped recessed structure 314 actively avoids the space area of ​​the central motor mounting position 11 by forming a downward concave shape. The concave part forms a longitudinal misalignment with the motor mounting position 11, which neither occupies the assembly space of the motor 2 nor affects the installation and operation of the motor 2. At the same time, when the motor 2 is not installed, the concave structure will not occupy additional ineffective space, ensuring that the movement range of the front and rear guide rods 30 is not restricted. Since the main body of the first front and rear guide rods 32 and the second front and rear guide rods 33 is still placed on the motion mechanism frame 10 near the middle, the movement stability of the first front and rear guide rods 32 and the second front and rear guide rods 33 will not be affected.

[0061] Meanwhile, the internal space of the headrest covered with soft material is limited. When used with the motor 2, it needs to accommodate the headrest rod 20, the motion mechanism frame 10, the front and rear guide rods 30, the locking assembly 40, the motor 2, and the cushioning filling material. If an extended or expanded design is adopted to avoid the motor 2, it will result in an increase in overall volume, squeezing the space for the filling material and affecting the comfort of the headrest. The arc-shaped recessed structure 314 achieves longitudinal space reuse by recessing downwards. Without increasing the lateral dimensions, it achieves avoidance by adjusting the longitudinal shape only, allowing the connecting parts and the motor mounting position 11 to be stacked vertically, significantly improving space utilization.

[0062] Preferred, see Figures 6 to 11 The headrest rod 20 is provided with a first position groove 24; the first locking member 42 includes a pivot 421, a connecting rod 422, and a first elastic member 423; the pivot 421 is fixed to the motion mechanism frame 10, one end of the connecting rod 422 is oscillatingly connected to the pivot 421, and the other end is connected to the manual locking bar 41; the motion mechanism frame 10 is provided with a limiting hole 12 to limit the swing range of the connecting rod 422; one end of the first elastic member 423 is connected to the manual locking bar 41, and the other end is connected to the motion mechanism frame 10, and the first elastic member 423 provides elastic force to the manual locking bar 41 to make it tend to drive the connecting rod 422 into the first position groove 24; wherein, the pressing operation part 411, see Figure 10 and Figure 11The connecting rod 422 can be driven to overcome the elastic force of the first elastic element 423 and swing around the rotating shaft 421. The connecting rod 422 moves from the X2 position to the X1 position, thereby disengaging the connecting rod 422 from the first gear groove 24. The other end of the connecting rod 422 is connected to the manual locking bar 41. This end is provided with a protrusion 425 and has a floating space 424 between it and the manual locking bar 41 to accommodate the movement of the manual locking bar 41 and the swing of the connecting rod 422 relative to the rotating shaft 421. At this time, the motion mechanism frame 10 is unlocked relative to the headrest bar 20. Similarly, when the pressing force applied to the operating part 411 is released, the connecting rod 422 moves from the X1 position to the X2 position under the reset action of the first elastic element 423 and is locked into the first gear groove 24 to fix the motion mechanism frame 10 relative to the headrest bar 20.

[0063] Similarly, see Figure 6 and Figure 12 The front and rear guide rods 30 are provided with a second position groove 34; the second locking member 43 includes a locking plate 431 and a second elastic member 432; one end of the locking plate 431 is connected to the manual locking bar 41, and the other end is engaged with the second position groove 34; one end of the second elastic member 432 is connected to the manual locking bar 41, and the other end is connected to the motion mechanism frame 10. The second elastic member 432 provides elastic force to the manual locking bar 41, which makes it tend to drive the locking plate 431 to be engaged in the second position groove 34; pressing the operating part 411 can drive the manual locking bar 41 to drive the locking plate 431 to move against the elastic force of the second elastic member 432, thereby disengaging from the second position groove 34 to achieve unlocking.

[0064] Therefore, in a specific implementation, when the user needs to adjust the height and front-to-back distance of the headrest at the same time, the specific operation process is as follows: During the unlocking stage, the user presses the operation part 411 of the manual locking bar 41, that is, presses the button located on the side of the headrest. At this time, the manual locking bar 41 simultaneously drives the first locking member 42 and the second locking member 43 to move.

[0065] In the first locking member 42, the connecting rod 422 overcomes the elastic force of the first elastic member 423 and swings around the pivot 421 fixed to the motion mechanism frame 10 (moving from position X2 to position X1), disengaging from the first stop groove 24 on the second headrest rod 23. At this time, the vertical movement constraint of the motion mechanism frame 10 relative to the first headrest rod 22 and the second headrest rod 23 is released. In the second locking member 43, the locking plate 431 moves with the manual locking bar 41, overcomes the elastic force of the second elastic member 432 and disengages from the second stop groove 34 on the first front and rear guide rods 32. The front and rear movement constraint of the first front and rear guide rods 32 and the second front and rear guide rods 33 relative to the motion mechanism frame 10 is released.

[0066] During the adjustment phase, the user holds the headrest panel 50 and applies upward or downward force, causing the motion mechanism frame 10 to slide along the headrest rod 20 to adjust the height; simultaneously, the user pushes or pulls the headrest panel 50 forward or backward, causing the front and rear guide rods 30 to move relative to the motion mechanism frame 10 to adjust the front-to-back distance. Because the headrest rod 20 is synchronized via the first connector 21 and the front and rear guide rods 30 are synchronized via the second connector 31, the headrest remains horizontal and without tilting during the adjustment process.

[0067] After the position adjustment is completed, during the locking phase, the user only needs to release the pressure on the operating part 411. At this time, the first elastic element 423 resets, pushes the manual locking bar 41 to drive the connecting rod 422 to swing in the opposite direction (from position X1 back to position X2), and locks into the first position groove 24 at the corresponding height of the headrest bar 20, completing the vertical locking; the second elastic element 432 resets, pulls the manual locking bar 41 to drive the locking plate 431 to reset, and locks into the second position groove 34 at the corresponding position of the front and rear guide rods 30, completing the front and rear locking.

[0068] The connecting rod 422 is fixed to the frame via the pivot 421, and its swing trajectory is constrained by the limiting hole 12 to avoid interference with the motor mounting position 11. At the same time, the position of the headrest rod 20 is unlocked by rotation, which provides a smaller footprint. The locking and unlocking functions are achieved by the small movement range of the connecting rod 422, so that the manual locking bar 41 will not extend out of the side of the motion mechanism frame 10 during movement. The side profile of the headrest is determined only by the frame body and the soft cushioning layer, and there is no need to reserve extra space for the extension of the manual locking bar 41, which improves the overall appearance and aesthetics of the headrest. Similarly, the card plate 431 is a flat structure that moves linearly with the manual locking bar 41, occupying little space.

[0069] Preferably, the locking assembly 40 further includes a limiting cover plate 46, which is connected to the motion mechanism frame 10. Both the manual locking bar 41 and the limiting cover plate 46 are sheet-like structures. The manual locking bar 41 and the limiting cover plate 46 are stacked sequentially and disposed on the outside of the motion mechanism frame 10. The limiting cover plate 46 encapsulates the manual locking bar 41 between itself and the motion mechanism frame 10 to regulate the movement path of the manual locking bar 41 and prevent deviation. The operating part 411 of the manual locking bar 41 is exposed through the limiting cover plate 46 for operation.

[0070] In this application, the manual locking bar 41 and its limiting cover 46 are positioned on the outside of the motion mechanism frame 10, rather than inside. Both the manual locking bar 41 and the limiting cover 46 are sheet-like structures, fixed to the outside of the frame by stacking, thus removing the locking mechanism from the inside of the frame and freeing up space for the internal motor mounting position 11, fundamentally avoiding interference. The sheet-like structure occupies minimal space in the vertical direction, and its stacking installation method does not significantly increase the overall thickness and volume of the mechanism, controlling the overall thickness of the locking assembly 40 and achieving a lightweight and compact design.

[0071] Preferred, see Figure 1 , Figure 13 and Figure 14 The four-way motion headrest mechanism 1 also includes a guide block 60; the guide block 60 is disposed between the motion mechanism frame 10 and the headrest rod 20, and / or, disposed between the motion mechanism frame 10 and the front and rear guide rods 30.

[0072] Preferably, the inner wall of the guide block 60 is provided with a rib 61, and the guide block 60 contacts and abuts against the headrest rod 20 and / or the front and rear guide rods 30 through the rib 61.

[0073] Specifically, the front and rear guide rods 30 are metal guide rods, which have a more stable structure, are less prone to deformation, and have high precision and small tolerances in their outer diameter machining. This results in a smaller and more stable fit between the guide rods and the guide holes of the guide blocks 60. Simultaneously, when the motion mechanism frame 10 moves up and down relative to the headrest rod 20, the guide blocks 60 located between the motion mechanism frame 10 and the headrest rod 20 can limit the lateral swaying of the headrest motion frame, ensuring that the up and down movement is linear. When the front and rear guide rods 30 move back and forth relative to the frame, the guide blocks 60 located between the motion mechanism frame 10 and the front and rear guide rods 30 can constrain the radial runout of the guide rods, preventing the front and rear guide rods 30 from warping.

[0074] Meanwhile, the guide block 60 is set to avoid the pain point of mold opening and repair force. In related technologies, the gap between the rod and the skeleton is large, which is unstable during the movement and adjustment process. This causes the locking force or unlocking force of the locking part to be unstable and cannot meet the standard. The mold or locking part structure needs to be adjusted repeatedly. Taking the second locking part 43 as an example, the clamping plate 431 needs to be accurately inserted into the second position groove 34 of the metal guide rod. If the front and rear guide rods 30 wobble radially due to the large gap, the alignment position of the clamping plate 431 and the groove will change with the wobble. For example, it should be inserted into the center of the groove, but it is actually offset to the left. This means that when the clamping plate 431 is misaligned, more force is needed to disengage it from the groove.

[0075] Therefore, this application preferably provides a guide block 60 between the headrest rod 20 and the motion mechanism frame 10, and simultaneously provides a guide block 60 between the front and rear guide rods 30 and the motion mechanism frame 10, thereby reducing the movement gap between the rod and the frame, ensuring that the locking part and the gear groove are accurately aligned, and the setting of the rib 61 further improves the assembly strength and assembly accuracy between the rod and the frame.

[0076] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A locking assembly, the locking assembly being adapted for a four-way motion headrest mechanism, the four-way motion headrest mechanism comprising a motion mechanism frame, and two headrest rods and two front and rear guide rods connected to the motion mechanism frame, characterized in that, The locking assembly is connected to the motion mechanism frame, and the locking assembly includes: Manual locking bar, first locking element, and second locking element; The manual locking bar is movably mounted on the outer wall of the motion mechanism frame; The first locking member is rotatably connected to the motion mechanism frame and linked with the manual locking bar. The first locking member swings around a fixed axis to engage or disengage from the headrest bar, thereby locking or unlocking the movement of the motion mechanism frame. The manual locking bar has clearance holes for the front and rear guide rods to pass through; The second locking member is connected to the manual locking bar and moves to engage or disengage from the front and rear guide rods as the manual locking bar moves, thereby locking or unlocking the movement of the front and rear guide rods.

2. The locking assembly as claimed in claim 1, characterized in that, The manual locking bar is equipped with an operating section for user operation; The first locking member is linked to the manual locking bar and has a first working position for locking or unlocking the movement of the motion mechanism frame relative to the headrest bar; The second locking member is linked to the manual locking bar and has a second working position for locking or unlocking the movement of the front and rear guide rods; By operating the manual locking bar through the operating unit, the first locking member and the second locking member can be simultaneously driven to switch between their respective working positions to a locked or unlocked state.

3. The locking assembly as described in claim 2, characterized in that, Two headrest rods are arranged in parallel, and the two headrest rods are connected by a first connector to achieve position synchronization; Two front and rear guide rods are arranged in parallel, and the two front and rear guide rods are connected by a second connector to achieve synchronous movement; The first locking element acts on one of the headrest bars to achieve synchronous locking or unlocking of both headrest bars; The second locking element acts on one of the front and rear guide rods to achieve synchronous locking or unlocking of both front and rear guide rods.

4. The locking assembly as claimed in claim 3, characterized in that, The headrest rod includes a first headrest rod and a second headrest rod, and the front and rear guide rods include a first front and rear guide rod and a second front and rear guide rod; The first headrest rod and the first front and rear guide rod are located on the same side of the motion mechanism frame, and the second headrest rod and the second front and rear guide rod are located on the other side of the motion mechanism frame; The first locking element is provided and acts on the second headrest rod; The second locking member is provided and acts on the first front and rear guide rods, thereby the first locking member and the second locking member are arranged in a staggered manner on the motion mechanism frame.

5. The locking assembly as claimed in claim 3, characterized in that, The motion mechanism frame has a pre-set motor mounting position. The locking component avoids the motor mounting position, so that when the motion mechanism frame is equipped with a motor, it can electrically lock the headrest rod and the front and rear guide rods. The locking component is used in conjunction with the motion mechanism frame to achieve shared use.

6. The locking assembly as claimed in claim 5, characterized in that, The second connector includes a first arc segment, a second arc segment, and a straight segment connecting the two arc segments; The first arc segment, the second arc segment, and the straight segment together form an arc-shaped recessed structure that is concave downward relative to the front and rear guide rods; The arc-shaped sunken structure avoids the motor mounting position on the motion mechanism frame.

7. The locking component as described in any one of claims 1-6, characterized in that, It also includes guide blocks; The guide block is disposed between the motion mechanism frame and the headrest rod, and / or between the motion mechanism frame and the front and rear guide rods; The inner wall of the guide block is provided with a raised rib, and the guide block contacts and abuts against the headrest rod and / or the front and rear guide rods through the raised rib.

8. The locking component as described in any one of claims 2-6, characterized in that, The headrest rod is provided with a first position groove; The first locking element includes a rotating shaft, a connecting rod, and a first elastic element; The rotating shaft is fixed to the motion mechanism frame, one end of the connecting rod is swayably connected to the rotating shaft, and the other end is connected to the manual locking bar; The motion mechanism frame is provided with limiting holes to restrict the swing range of the connecting rod; One end of the first elastic element is connected to the manual locking bar, and the other end is connected to the motion mechanism frame. The first elastic element provides the manual locking bar with an elastic force that tends to drive the connecting rod into the first gear groove. Pressing the operating part causes the connecting rod to overcome the elastic force of the first elastic element and swing around the rotating shaft, thereby disengaging the connecting rod from the first gear groove to unlock it.

9. The locking component as described in any one of claims 2-6, characterized in that, The front and rear guide rods are provided with a second gear groove; The second locking element includes a locking plate and a second elastic element; One end of the card plate is connected to the manual locking strip, and the other end engages with the second gear groove; One end of the second elastic member is connected to the manual locking bar, and the other end is connected to the motion mechanism frame. The second elastic member provides the manual locking bar with an elastic force that causes the locking plate to tend to be locked into the second gear groove. Pressing the operating part can drive the manual locking bar to move the card plate against the elastic force of the second elastic member, thereby disengaging it from the second position groove to unlock it.

10. A four-way motion headrest mechanism, characterized in that, include: The motion mechanism frame, headrest rod, front and rear guide rods, and locking assembly as described in any one of claims 1-9, wherein the headrest rod is connected to the motion mechanism frame and the motion mechanism frame is movable relative to the headrest rod in the vertical direction, and the front and rear guide rods are connected to the motion mechanism frame and are movable relative to the motion mechanism frame in the front and rear directions; The locking component is movably connected to the motion mechanism frame. One end of the locking component is disposed corresponding to the headrest rod and is used to unlock or lock the motion mechanism frame relative to the headrest rod in vertical movement. The other end of the locking component is disposed corresponding to the front and rear guide rods and is used to unlock or lock the movement of the front and rear guide rods.

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