A four-way movement headrest mechanism

Abstract

The application discloses a four-way moving headrest mechanism, which comprises a moving mechanism framework, a headrest rod, a front-rear guide rod and a locking assembly. The locking assembly is connected with the moving mechanism framework, and 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 in linkage connection with the manual locking strip. 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 through which the front-rear guide rod passes. The second locking piece is connected with the manual locking strip and is translated to be clamped into or separated from the front-rear guide rod along with the movement of the manual locking strip, so as to realize the locking or unlocking of the movement of the front-rear guide rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of headrest supports, in particular to a four-way movement headrest mechanism. BACKGROUND

[0002] At present, with the increasing demand for comfort of automobile seats, the four-way adjustment function of the headrest: up-down height adjustment, forward-backward distance adjustment has become the mainstream configuration. Currently, the four-way movement headrest mechanism in the industry is mainly divided into two categories: manual adjustment type and electric adjustment type.

[0003] For the manual adjustment type four-way movement headrest, for example, the Chinese patent application CN118876838A provides a manual four-way headrest, which discloses a manual four-way adjustment structure. The structure sets a square section lock strip, which moves along a specific track in the guide channel of the inner lining block, realizes the synchronous unlocking and locking control of the headrest rod (up-down adjustment) and the guide column (forward-backward adjustment), and thus completes the four-way adjustment action of the headrest.

[0004] However, the cooperation relationship between the above-mentioned square structure lock strip and guide column makes the space required for the movement adjustment of the lock strip larger, and the cooperation strength is lower. When the lock strip moves in the guide channel of the inner lining block, the lock strip will shake relative to the inner lining block during the locking and unlocking adjustment process, and the stability is poor. SUMMARY

[0005] The purpose of the present application is to provide a four-way movement headrest mechanism to improve the stability during the adjustment of the headrest.

[0006] To achieve the above purpose, the technical solution adopted by the present application is as follows: a four-way movement headrest mechanism is provided, which comprises a movement mechanism framework, a headrest rod, a forward-backward guide rod and a locking assembly. The headrest rod is connected with the movement mechanism framework, and the movement mechanism framework can move in the up-down direction relative to the headrest rod. The forward-backward guide rod is connected with the movement mechanism framework and can move forward and backward relative to the movement mechanism framework. The locking assembly is connected with the movement mechanism framework, and the locking assembly comprises a manual lock strip, a first locking piece and a second locking piece. The manual lock strip is movably arranged on the outer wall of the movement mechanism framework. The first locking piece is rotatably connected to the movement mechanism framework and is connected with the manual lock 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 movement mechanism framework. The manual lock strip is provided with an avoiding hole through which the forward-backward guide rod passes. The second locking piece is connected with the manual lock strip and is translated to clamp into or separate from the forward-backward guide rod with the movement of the manual lock strip, so as to realize the locking or unlocking of the movement of the forward-backward guide rod.

[0007] In the related art, the headrest movement mechanism often uses a rectangular long locking strip to cooperate with a guide column to realize the locking function. The locking structure is usually arranged inside a plastic inner lining block. However, since the inner lining is an injection molded part, it is difficult to ensure high precision dimensions when opening the mold integrally; at the same time, in order to facilitate the movement of the rectangular locking strip and the guide column in the channel, it is necessary to set a draft angle in the mold for the rectangular channel. If the draft angle is not set, the rectangular locking strip or the guide column will be difficult to move due to four-sided adhesion in the channel, causing jamming. If the draft angle is set for the channel, a significant assembly gap will exist between the channel cross section and the locking strip and the guide column. This gap can easily cause the headrest to shake during adjustment, affecting the operation feel and structural stability. This problem is determined by the process characteristics of the multi-surface contact plastic part and is difficult to completely avoid.

[0008] At the same time, the locking strip arrangement form used in the related art transversely penetrates the inner lining block, and regardless of the headrest rod or the guide column, a multi-tooth engagement locking method is used. When the locking strip is pressed, the end of the locking strip often protrudes significantly relative to the inner lining block during the unlocking or locking process, thereby resulting in low overall structural space utilization and large space occupation.

[0009] Therefore, in view of the above problems, the following structural improvements are proposed. First, the manual locking strip is arranged on the outer wall of the movement mechanism skeleton instead of being arranged in the built-in channel. The manual locking strip is installed in an external manner, and its outer dimensions can be accurately controlled by machining. There is no need to open a rectangular moving channel in the movement mechanism skeleton, thereby fundamentally avoiding the fitting gap caused by the draft angle and significantly improving the assembly precision and operation stability. In addition, the manual locking strip is provided with a relief hole for the front and rear guide rods to pass through. This structure not only plays a guiding role but also limits the movement stroke of the manual locking strip to avoid excessive adjustment and improve the action accuracy of locking and unlocking.

[0010] The present application file realizes unlocking of the headrest rod position through swinging of the first locking part, replacing the long-stroke translational movement of the locking strip in the related art. The swinging unlocking mechanism effectively reduces the space occupation 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 movement headrest mechanism further comprises a guide block; the guide block is arranged between the movement mechanism skeleton and the headrest rod, and / or is arranged between the movement mechanism skeleton and the front and rear guide rods. The inner wall of the guide block is provided with a protruding rib, and the guide block contacts and abuts against the headrest rod and / or the front and rear guide rods through the protruding rib.

[0012] Wherein, in order to reduce the activity gap between the headrest rod and the front and rear guide rod and the moving mechanism skeleton, the application independently sets a guide block between the two. The guide block serves as an intermediate guide component and cooperates with the rod and the moving mechanism skeleton respectively. In order to strengthen the connection strength, the front and rear guide rods and the headrest rod in the application can be selected as metal rods. The setting of the guide block can avoid the direct friction between the metal rod and the plastic skeleton, effectively eliminate the gap during movement, prevent shaking, and further improve the overall structural strength and wear resistance by using metal rods.

[0013] As a preferred, the manual locking strip is provided with an operation part for user operation; the first locking part is linked with the manual locking strip and has a first working position for locking or unlocking the movement of the moving mechanism skeleton relative to the headrest rod; the second locking part is linked with the manual locking strip and has a second working position for locking or unlocking the movement of the front and rear guide rods; the manual locking strip can be operated by the operation part to synchronously drive the first locking part and the second locking part to switch between the locking or unlocking state in their respective working positions.

[0014] As another preferred, the headrest rod is provided with two parallel rods, and the two headrest rods are connected by a first connecting part to realize position synchronization; the front and rear guide rods are provided with two parallel rods, and the two front and rear guide rods are connected by a second connecting part to realize synchronous movement; the first locking part acts on one of the headrest rods to realize synchronous locking or unlocking of the two headrest rods; the second locking part acts on one of the front and rear guide rods to realize 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 rod includes 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 moving mechanism skeleton, and the second headrest rod and the second front and rear guide rod are located on the other side of the moving mechanism skeleton; the first locking part is arranged corresponding to the second headrest rod and acts on it; the second locking part is arranged corresponding to the first front and rear guide rod and acts on it, and then the first locking part and the second locking part are arranged in a staggered manner on the moving mechanism skeleton.

[0016] Preferably, the headrest rod is provided with a first gear recess; the first locking part includes a rotating shaft part, a connecting rod and a first elastic part; the rotating shaft part is fixed to the moving mechanism skeleton, one end of the connecting rod is swingably connected to the rotating shaft part, and the other end is connected to the manual locking strip; the moving mechanism skeleton is provided with a limiting hole limiting the swing range of the connecting rod; one end of the first elastic part is connected to the manual locking strip, and the other end is connected to the moving mechanism skeleton; the first elastic part provides the manual locking strip with an elastic force to make it have a tendency to drive the connecting rod to be clamped into the first gear recess; wherein, pressing the operation part can drive the connecting rod to overcome the elastic force of the first elastic part and swing around the rotating shaft part, so that the connecting rod is separated from the first gear recess to realize unlocking.

[0017] Preferably, the front and rear guide rods are provided with second gear recesses; the second locking member comprises a clamping plate and a second elastic member; one end of the clamping plate is connected with the manual locking strip, and the other end is engaged with the second gear recess; one end of the second elastic member is connected with the manual locking strip, and the other end is connected with the movement mechanism skeleton; the second elastic member provides the manual locking strip with an elastic force to make it have a tendency to drive the clamping plate to remain clamped into the second gear recess; the pressing operation part can drive the manual locking strip to drive the clamping plate to move against the elastic force of the second elastic member, so as to disengage from the second gear recess to realize unlocking.

[0018] Among them, the key locking elements in the locking assembly, such as the connecting rod for headrest rod locking and the clamping plate for front and rear locking, are all independently processed metal parts, which are assembled on the locking strip and the movement mechanism skeleton in a modular way. This modular design not only ensures high matching precision, but also facilitates later maintenance and part replacement, and the overall structure is compact and reliable, effectively suppressing the shaking phenomenon during adjustment.

[0019] Preferably, the movement mechanism skeleton is provided with a motor mounting position, and the locking assembly avoids the motor mounting position, so that when the movement mechanism skeleton is assembled with the motor, the headrest rod and the front and rear guide rods can be electrically locked, and the movement mechanism skeleton can be shared with the locking assembly.

[0020] Further preferably, the second connecting member comprises a first arc-shaped segment, a second arc-shaped segment, and a straight segment connected between the two arc-shaped segments; the first arc-shaped segment, the second arc-shaped segment, and the straight segment together form an arc-shaped sunken structure which is concave downward relative to the front and rear guide rods; the arc-shaped sunken structure avoids the motor mounting position on the movement mechanism skeleton.

[0021] Preferably, the locking assembly further comprises a limiting cover plate, the limiting cover plate is connected with the movement mechanism skeleton, and the manual locking strip and the limiting cover plate are both sheet-shaped structures; the manual locking strip and the limiting cover plate are sequentially stacked and arranged on the outside of the movement mechanism skeleton, and the manual locking strip is encapsulated between the limiting cover plate and the movement mechanism skeleton through the limiting cover plate; the operation part of the manual locking strip protrudes through the limiting cover plate for operation.

[0022] Therefore, compared with the prior art, the beneficial effects of the present application are that the manual locking strip is arranged on the outer wall of the movement mechanism skeleton instead of being built-in, the manual locking strip is installed in an external hanging manner, its external dimensions can be accurately controlled by machining, and there is no need to open a rectangular moving channel in the movement mechanism skeleton, thereby fundamentally avoiding the matching gap caused by the draft angle, and significantly improving the assembly precision and operation stability.

[0023] Meanwhile, the first locking piece is swung to unlock the position of the headrest rod, replacing the long stroke translation movement of the locking strip in the related art; the swing unlocking mechanism effectively reduces the space required for operation, makes the overall layout of the locking structure more compact, and significantly improves the space utilization efficiency of the mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Structure diagram of the four-way movement headrest mechanism from the isometric side view.

[0025] Figure 2 Structure diagram of the four-way movement headrest mechanism from another isometric side view.

[0026] Figure 3 Structure diagram of the four-way movement headrest mechanism from the front view.

[0027] Figure 4 Structure diagram of the four-way movement headrest mechanism from the rear view.

[0028] Figure 5 Structure diagram of the four-way movement headrest mechanism from the side view.

[0029] Figure 6 Structure diagram of the four-way movement headrest mechanism in which some parts such as the hidden movement mechanism skeleton are hidden.

[0030] Figure 7 Structure diagram of the first locking piece position.

[0031] Figure 8 Structure diagram of the first locking piece position from the isometric side view.

[0032] Figure 9 Structure diagram of the first locking piece position from another isometric side view.

[0033] Figure 10 Swing diagram of the connecting rod.

[0034] Figure 11 Structure diagram of the connecting rod and the manual locking strip connection position.

[0035] Figure 12 Structure diagram of the second locking piece position.

[0036] Figure 13 Sectional view of the guide block and the headrest connection position.

[0037] Figure 14 Structure diagram of the guide block.

[0038] In the figure: 1, four-way moving headrest mechanism; 2, motor; 10, moving mechanism skeleton; 11, motor mounting position; 12, limiting hole; 20, headrest rod; 21, first connecting piece; 22, first headrest rod; 23, second headrest rod; 24, first gear recess; 30, front and rear guide rod; 31, second connecting piece; 311, first arc-shaped section; 312, second arc-shaped section; 313, straight section; 314, arc-shaped sunken structure; 32, first front and rear guide rod; 33, second front and rear guide rod; 34, second gear recess; 40, locking assembly; 41, manual locking strip; 411, operation part; 42, first locking piece; 421, rotating shaft part; 422, connecting rod; 423, first elastic piece; 424, floating space; 425, protrusion; 43, second locking piece; 431, clamping plate; 432, second elastic piece; 44, first working position; 45, second working position; 46, limiting cover plate; 50, headrest panel; 60, guide block; 61, protruding rib. DETAILED DESCRIPTION

[0039] Hereinafter, the present application will be further described in conjunction with specific embodiments, it should be noted that, without conflict, the following described embodiments or technical features between each other or between each other can be any combination to form a new embodiment.

[0040] In the description of the present application, it should be noted that, for orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0041] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

[0042] The terms "include" and "have" and any variations thereof in the specification and claims of the present 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 does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] In a preferred embodiment, the present application provides a four-way moving headrest mechanism 1, as shown inFigure 4 With Figure 5 , comprising: a motion mechanism skeleton 10, a headrest rod 20, a front and rear guide rod 30, the headrest rod 20 is connected with the motion mechanism skeleton 10, and the motion mechanism skeleton 10 can move in the up-down direction relative to the headrest rod 20, corresponding Figure 4 And Figure 5 The up-down direction in; one end of the front and rear guide rod 30 is connected with the motion mechanism skeleton 10, and the other end is used for being connected with a headrest panel 50, so that the headrest panel 50 is driven to move in the front and rear direction through the movement of the front and rear guide rod 30 relative to the motion mechanism skeleton 10, and the movement direction corresponds to Figure 5 The left-right direction in.

[0044] Among them, the four-way motion headrest mechanism 1 is suitable for vehicle headrest, the motion mechanism skeleton 10 is wrapped with flexible material, the headrest rod 20 provides support, the motion mechanism skeleton 10 moves up and down relative to the headrest rod 20 to adjust the height of the headrest, similarly, the front and rear guide rod 30 is wrapped with flexible material, and the front and rear guide rod 30 can move forward and backward relative to the motion mechanism skeleton 10, and the position of the motion mechanism skeleton 10 is adjusted to realize four-way adjustment of the headrest.

[0045] In actual production process, according to different needs of users, the four-way adjustment of the headrest is divided into manual adjustment and electric adjustment. The manual adjustment, as the name implies, does not install driving components such as motors 2 in the headrest, and the height of the headrest and the front and rear distance are adjusted by physical pressing and pushing of the user, which has the advantages of simple structure, light weight, not easy to damage and convenient maintenance. The four-way headrest structure of the electric adjustment is that the driving components such as the motor 2 are installed in the motion mechanism skeleton 10, and the motion mechanism skeleton 10 and the front and rear guide rod 30 are driven to move by the driving components such as the motor 2, without manual adjustment of the user, only command input is needed, which can optimize the user experience.

[0046] Since the vehicle manufacturer will decide to use an electrically adjusted headrest or a manually adjusted headrest when assembling the headrest according to its own product positioning, the four-way motion headrest mechanism 1 provided in the present application is based on the product supply end. For the product supply end, the structures of the electrically adjusted headrest mechanism and the manually adjusted headrest mechanism are different, and separately opening a mold for any one adjustment mode will increase the cost. Therefore, the present application provides a four-way motion headrest mechanism 1 that can be shared by electrically adjusted and manually adjusted, so that the vehicle manufacturer can select an electrically adjusted scheme or a manually adjusted scheme in the four-way motion headrest mechanism 1 according to the actual use demand, or the electrically adjusted scheme and the manually adjusted scheme coexist in the four-way motion headrest mechanism 1 provided in the present application, thereby realizing cost reduction and efficiency increase, and being able to adapt to more use scenarios.

[0047] For this purpose, see Figures 1 to 14The four-way headrest mechanism 1 further comprises a locking assembly 40 connected with the movement mechanism framework 10. One end of the locking assembly 40 is arranged corresponding to the headrest rod 20, and is used for unlocking or locking the up-down movement of the movement mechanism framework 10 relative to the headrest rod 20. The other end of the locking assembly 40 is arranged corresponding to the front-back guide rod 30, and is used for unlocking or locking the front-back movement of the front-back guide rod 30 relative to the movement mechanism framework 10. The movement mechanism framework 10 is pre-provided with a motor installation position 11. The locking assembly 40 avoids the motor installation position 11, so that when the movement mechanism framework 10 is assembled with the motor 2, the motor 2 can realize the electric locking of the headrest rod 20 and the front-back guide rod 30, and cooperates with the locking assembly 40 to realize the common use of the movement mechanism framework 10.

[0048] It should be noted that the locking assembly 40 provided is corresponding to manual adjustment, and the motor installation position 11 pre-provided on the movement mechanism framework 10 is corresponding to electric adjustment. The specific mode of electric adjustment can be realized only by installing the motor 2 on the movement mechanism framework 10, and by driving connection of the motor 2 with the headrest rod 20 and the front-back guide rod 30. Therefore, the specific operation mode of electric adjustment of the headrest position is not described here again, and only how to reasonably set the motor 2 is disclosed.

[0049] Therefore, referring to Figures 1 to 5 For the movement mechanism framework 10, preferably, the motor installation position 11 is arranged at the middle position of the motor 2 movement framework, so as to ensure that the motor 2 is relatively stable after being assembled to the motor 2 movement framework. Correspondingly, the locking assembly 40 is arranged at the lower position of the motor 2 movement framework, so as to avoid the arrangement of the motor installation position 11 and ensure that the locking assembly 40 does not interfere with the pre-provided space of the motor installation position 11 during the unlocking or locking process. The locking assembly 40 can independently complete the locking or unlocking of the headrest rod 20 in the up-down direction and the front-back guide rod 30 in the front-back direction at the lower part, does not occupy the space of the motor installation position 11, and the manual adjustment function is not affected. When the motor 2 is assembled, the motor 2 works independently at the middle part, can be driven by the motor 2 to realize electric locking, and the lower locking assembly 40 can still normally act. The two do not overlap in space and do not interfere in action, which can effectively avoid the problem that manual and electric functions cannot coexist due to component space interference, and provides a structural basis for a set of framework compatible with two adjustment modes.

[0050] Meanwhile, since the spatial layout of the motor mounting position 11 and the locking assembly 40 is fixed and does not conflict, the mold of the same set of motion mechanism framework 10 does not need to be structurally modified for manual adjustment or electric adjustment, and does not need to redesign the framework shape, adjust the locking assembly 40 mounting hole position, and only needs to determine whether to assemble the motor 2 to realize the switching of the two configurations, complete the structural sharing of motor 2 adjustment and manual adjustment, thereby reducing the mold development cost for the supply side, simplifying the production process, realizing cost reduction and efficiency increase, and using in multiple scenarios and multiple working conditions.

[0051] As a preferred, referring to Figure 6 , the locking assembly 40 includes a manual locking strip 41, a first locking piece 42 and a second locking piece 43; the manual locking strip 41 is movably arranged on the motion mechanism framework 10 and is provided with an operation part 411 for user operation, and the manual locking strip 41 is an unlocking slider structure and is slidably connected with the motion mechanism framework 10; the first locking piece 42 is linked with the manual locking strip 41 and has a first working position 44 for locking or unlocking the movement of the motion mechanism framework 10 relative to the headrest rod 20; the second locking piece 43 is linked with the manual locking strip 41 and has a second working position 45 for locking or unlocking the movement of the front and rear guide rods 30, and the manual locking strip 41 is provided with an avoiding hole for the front and rear guide rods 30 to pass through, that is Figure 6 the opening shown at the second working position 45 in the figure; by operating the manual locking strip 41 through the operation part 411, the first locking piece 42 and the second locking piece 43 can be synchronously driven to switch between the locking or unlocking state in their respective working positions.

[0052] Among them, the manual locking strip 41 is taken as a common transmission carrier in the present application, and the first locking piece 42 and the second locking piece 43 are linked with the same operation carrier, without the need to separately provide independent operation rods or transmission structures for the two locking pieces, which greatly reduces the overall occupied volume of the locking assembly 40; at the same time, in combination with the preset area of the motor mounting position 11, the motor mounting position 11 is preferably arranged in the middle part of the framework and is matched with the locking assembly 40 arranged in the lower part of the framework, which further avoids the spatial interference between the locking assembly 40 and the motor 2, and reserves more sufficient installation space for other components inside the headrest, such as the buffer material, the motor 2, etc., which is suitable for the design trend of lightweight and miniaturization of the headrest.

[0053] As another preferred, the headrest rods 20 are arranged in parallel with two, and the two headrest rods 20 are connected by a first connecting piece 21 to realize position synchronization, the first connecting piece 21 is a kind of connecting support, and specifically a kind of rod body structure;The front and rear guide rods 30 are arranged in parallel with two, and the two front and rear guide rods 30 are connected by a second connecting piece 31 to realize synchronous movement, the second connecting piece 31 is also preferably a kind of rod body structure;The first locking member 42 acts on one of the headrest rods 20 to realize the synchronous locking or unlocking of the two headrest rods 20;The second locking member 43 acts on one of the front and rear guide rods 30 to realize the synchronous locking or unlocking of the two front and rear guide rods 30.

[0054] Specifically, for the four-way movement headrest mechanism 1, in order to ensure the movement stability of the movement mechanism skeleton 10, the headrest rods 20 will be provided with multiple, and similarly, the front and rear guide rods 30 are provided with multiple to ensure that the headrest panel 50 is externally covered with flexible material relative to the movement mechanism skeleton 10 has stable movement stroke. Therefore, the headrest rods 20 in the present application are preferably provided with two, distributed on both sides of the movement mechanism skeleton 10, and the front and rear guide rods 30 are arranged at the positions corresponding to the headrest rods 20, and also provided with two;Therefore, the present application integrates two parallel rods into a single synchronous unit through the rigid connection of the first connecting piece 21 and the second connecting piece 31, to ensure that the displacement and movement speed of the two rods are completely consistent;At the same time, only by acting on one of the headrest rods 20 by the first locking member 42 and on one of the front and rear guide rods 30 by the second locking member 43, the overall locking or unlocking of the synchronous unit can be realized by means of the force transmission of the connecting piece.

[0055] Further preferably, the headrest rods 20 include 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 movement mechanism skeleton 10, and the second headrest rod 23 and the second front and rear guide rod 33 are located on the other side of the movement mechanism skeleton 10;The first locking member 42 is arranged corresponding to the second headrest rod 23 and acts on it;The second locking member 43 is arranged corresponding to the first front and rear guide rod 32 and acts on it, and then the first locking member 42 and the second locking member 43 are arranged in a staggered manner on the movement mechanism skeleton 10.

[0056] Only two locking members are required: namely the first locking member 42 and the second locking member 43, which can realize the synchronous locking of the first headrest rod 22 and the second headrest rod 23, and the double-rod synchronous locking of the first front and rear guide rod 32 and the second front and rear guide rod 33, by reducing the number of locking components, both the mold development cost and the assembly process can be simplified.

[0057] Meanwhile, the headrest interior needs to accommodate the movement mechanism framework 10, the double headrest rod 20, the double front and rear guide rod 30, the locking assembly 40, and part of the practical scene also needs to assemble the motor 2 in the motor mounting position 11, so the space is extremely compact. The setting of the double locking piece controlling the double rod in the related technology will occupy more horizontal space, and is easy to interfere with the motor mounting position 11 and the headrest buffer material, limiting the compatibility of manual and electric functions; and the single locking piece controlling the double rod in the present application can effectively reduce the horizontal space occupied by the locking assembly 40, cooperate with the layout of the locking assembly 40 being arranged at the lower part of the framework and the motor mounting position 11 being arranged at the middle part, further release the interior space of the headrest, avoid the space conflict between the locking assembly 40 and the motor 2, and reserve more space for the filling of the buffer material, so as to adapt to the design requirements of different configuration vehicle models.

[0058] Further preferably, referring to Figure 2 , Figure 3 and Figure 5 , the second connecting piece 31 comprises a first arc-shaped section 311, a second arc-shaped section 312, and a straight section 313 connected between the two arc-shaped sections; the first arc-shaped section 311, the second arc-shaped section 312, and the straight section 313 together constitute an arc-shaped sunken structure 314 which is concave downward relative to the front and rear guide rod 30; the arc-shaped sunken structure 314 avoids the motor mounting position 11 on the movement mechanism framework 10.

[0059] The arc-shaped sunken structure 314 actively avoids the space area of the middle motor mounting position 11 by constituting a downward concave form, the concave part is longitudinally staggered with the motor mounting position 11, neither occupies the assembly space of the motor 2, nor affects the installation and operation of the motor 2; meanwhile, when the motor 2 is not assembled, the concave structure will not additionally occupy invalid space, ensuring that the movement range of the front and rear guide rod 30 is not limited, and since the main body parts of the first front and rear guide rod 32 and the second front and rear guide rod 33 are still arranged on the movement mechanism framework 10 close to the middle part, the movement stability of the first front and rear guide rod 32 and the second front and rear guide rod 33 will not be affected.

[0060] Meanwhile, the interior space of the headrest coated with soft material is limited, when assembled with the motor 2, it needs to accommodate the headrest rod 20, the movement mechanism framework 10, the front and rear guide rod 30, the locking assembly 40, the motor 2, and the buffer filling material, etc., if the lengthening or outward expansion design is adopted to avoid the motor 2, it will lead to the increase of the overall volume, squeeze the filling material space, and affect the comfort of the headrest. The arc-shaped sunken structure 314 realizes longitudinal space reuse by concave downward, without increasing the horizontal size, only by adjusting the longitudinal form to avoid, so that the connecting piece and the motor mounting position 11 are vertically stacked, which significantly improves the space utilization.

[0061] Preferably, referring to Figures 6 to 11, the headrest rod 20 is provided with a first gear recess 24; the first locking member 42 comprises a rotating shaft part 421, a connecting rod 422 and a first elastic member 423; the rotating shaft part 421 is fixed to the movement mechanism framework 10, one end of the connecting rod 422 is swingably connected to the rotating shaft part 421, and the other end is connected with the manual locking strip 41; the movement mechanism framework 10 is provided with a limiting hole 12 for limiting the swing range of the connecting rod 422; one end of the first elastic member 423 is connected with the manual locking strip 41, and the other end is connected with the movement mechanism framework 10, the first elastic member 423 provides the manual locking strip 41 with an elastic force to make it have a tendency to drive the connecting rod 422 to be clamped into the first gear recess 24; wherein, the pressing operation part 411, see Figure 10 and Figure 11 , the connecting rod 422 can be driven to overcome the elastic force of the first elastic member 423 and swing around the rotating shaft part 421, the connecting rod 422 moves from the X2 position to the X1 position, so that the connecting rod 422 is disengaged from the first gear recess 24, the other end of the connecting rod 422 is connected with the manual locking strip 41, and this end is provided with a protrusion 425, and there is a floating space 424 between the protrusion 425 and the manual locking strip 41, so as to adapt to the movement of the manual locking strip 41 and the swing of the connecting rod 422 relative to the rotating shaft part 421, at this time, the movement mechanism framework 10 is unlocked relative to the headrest rod 20; similarly, the pressing force applied to the operation part 411 is released, at this time, the connecting rod 422 moves from the X1 position to the X2 position under the resetting action of the first elastic member 423, and is clamped into the first gear recess 24, so as to realize the fixation of the movement mechanism framework 10 relative to the headrest rod 20.

[0062] Similarly, see Figure 6 and Figure 12 , the front and rear guide rods 30 are provided with a second gear recess 34; the second locking member 43 comprises a clamping plate 431 and a second elastic member 432; one end of the clamping plate 431 is connected with the manual locking strip 41, and the other end is clamped with the second gear recess 34; one end of the second elastic member 432 is connected with the manual locking strip 41, and the other end is connected with the movement mechanism framework 10, the second elastic member 432 provides the manual locking strip 41 with an elastic force to make it have a tendency to drive the clamping plate 431 to be clamped into the second gear recess 34; the pressing operation part 411 can drive the manual locking strip 41 to drive the clamping plate 431 to move against the elastic force of the second elastic member 432, so as to be disengaged from the second gear recess 34 to realize the unlocking.

[0063] Therefore, in a specific embodiment, when the user needs to adjust the height and the front and rear distance of the headrest at the same time, the specific operation process is as follows: in the unlocking stage, the user presses the operation part 411 of the manual locking strip 41, that is, presses the button of the headrest located at the side part, at this time, the manual locking strip 41 synchronously drives the first locking member 42 and the second locking member 43 to act.

[0064] In the first locking member 42, the connecting rod 422 overcomes the elastic force of the first elastic member 423, swings (moves from the X2 position to the X1 position) around the rotating shaft part 421 fixed to the movement mechanism framework 10, and is disengaged from the first gear recess 24 on the second headrest rod 23, at which time the up-down movement constraint of the movement mechanism framework 10 relative to the first headrest rod 22 and the second headrest rod 23 is released; in the second locking member 43, the clamping plate 431 moves with the manual locking strip 41, overcomes the elastic force of the second elastic member 432, and is disengaged from the second gear recess 34 on the first front-back guide rod 32, and the first front-back guide rod 32 and the second front-back guide rod 33 are released from the front-back movement constraint relative to the movement mechanism framework 10.

[0065] In the adjustment stage, the user holds the headrest panel 50 with his hand, applies force upward or downward, drives the movement mechanism framework 10 to slide along the headrest rod 20 to adjust the height, and at the same time pushes or pulls the headrest panel 50 forward or backward to drive the front-back guide rod 30 to move relative to the movement mechanism framework 10 to adjust the front-back distance. Because the headrest rod 20 is synchronized through the first connecting member 21 and the front-back guide rod 30 is synchronized through the second connecting member 31, the headrest always remains horizontal during the adjustment process and is not skewed.

[0066] After the position adjustment is completed, in the locking stage, the user only needs to release the pressing on the operation part 411, at which time the first elastic member 423 resets, pushes the manual locking strip 41 to drive the connecting rod 422 to swing in the reverse direction (from the X1 position back to the X2 position), clamps into the first gear recess 24 corresponding to the height of the headrest rod 20, and completes the up-down direction locking; the second elastic member 432 resets, pulls the manual locking strip 41 to drive the clamping plate 431 to reset, clamps into the second gear recess 34 corresponding to the position of the front-back guide rod 30, and completes the front-back direction locking.

[0067] The connecting rod 422 is fixed to the framework through the rotating shaft part 421, the swing trajectory is constrained by the limiting hole 12 to avoid interference with the motor installation site 11, the position of the headrest rod 20 is provided with a smaller occupied space through the rotation unlocking, the locking and unlocking functions are realized through a smaller movement range of the connecting rod 422, so that the manual locking strip 41 does not extend to the side of the movement mechanism framework 10 during the movement, the side profile of the headrest is only determined by the framework body and the soft cushion layer, and there is no need to additionally reserve the extension space of the manual locking strip 41, thereby improving the integrity and aesthetics of the appearance of the headrest; similarly, the clamping plate 431 is a flat plate structure and moves linearly with the manual locking strip 41, and occupies a small space.

[0068] Preferably, the locking assembly 40 further comprises a limiting cover plate 46 connected with the movement mechanism framework 10, and the manual locking strip 41 and the limiting cover plate 46 are both in a sheet structure; the manual locking strip 41 and the limiting cover plate 46 are sequentially stacked and arranged outside the movement mechanism framework 10, the manual locking strip 41 is encapsulated between the limiting cover plate 46 and the movement mechanism framework 10 by the limiting cover plate 46, so as to standardize the movement path of the manual locking strip 41 and avoid the deviation phenomenon; the operation part 411 of the manual locking strip 41 penetrates through the limiting cover plate 46 and is exposed for operation.

[0069] In the present application, the manual locking strip 41 and the limiting cover plate 46 are arranged outside the movement mechanism framework 10 instead of inside, and both the manual locking strip 41 and the limiting cover plate 46 are in a sheet structure and are fixed on the outside of the framework by stacking, so that the locking mechanism is moved out of the framework, the movement space is left for the motor installation position 11 in the framework, and the interference is fundamentally avoided. The sheet structure occupies very small space in the vertical direction, and the stacking installation mode does not significantly increase the thickness and volume of the whole mechanism, so that the overall thickness of the locking assembly 40 is controlled, and the effects of light weight and small volume are achieved.

[0070] Preferably, referring to Figure 1 , Figure 13 and Figure 14 , the four-way movement headrest mechanism 1 further comprises a guide block 60; the guide block 60 is arranged between the movement mechanism framework 10 and the headrest rod 20, and / or arranged between the movement mechanism framework 10 and the front and rear guide rods 30.

[0071] Preferably, the inner wall of the guide block 60 is provided with a convex rib 61, and the guide block 60 is in contact and abutment with the headrest rod 20 and / or the front and rear guide rods 30 through the convex rib 61.

[0072] Specifically, the front and rear guide rods 30 are metal guide rods, which are more stable in structure and less likely to be deformed, have high machining precision and small tolerance, and have smaller and more stable gaps matched with the guide holes of the guide block 60. At the same time, when the movement mechanism framework 10 moves up and down relative to the headrest rod 20, the guide block 60 arranged between the movement mechanism framework 10 and the headrest rod 20 can limit the lateral shaking of the headrest movement framework, so as to ensure that the up and down movement is linear movement; when the front and rear guide rods 30 move forward and backward relative to the framework, the guide block 60 arranged between the movement mechanism framework 10 and the front and rear guide rods 30 can constrain the radial runout of the guide rods, so as to avoid the up and down warping phenomenon of the front and rear guide rods 30.

[0073] Meanwhile, the guide block 60 is arranged to avoid the pain point of mold opening force, and the gap between the rod body and the framework in the related art is large, which is unstable during the movement and adjustment process, so that the locking force or unlocking force of the locking member cannot be stable and meet the standard, and the mold or the structure of the locking member needs to be repeatedly adjusted. Taking the second locking member 43 as an example, the clamping plate 431 needs to be accurately clamped into the second gear groove 34 of the metal guide rod, if the front and rear guide rods 30 appear radial shaking due to the large gap, the alignment position of the clamping plate 431 and the groove will change with the shaking, for example, the clamping plate 431 should be clamped into the center of the groove, but in fact it is offset to the left, so that when the clamping plate 431 is clamped, it needs to be separated from the groove with greater force.

[0074] Therefore, the application file preferably arranges the guide block 60 between the headrest rod 20 and the movement mechanism framework 10, and synchronously arranges the guide block 60 between the front and rear guide rods 30 and the movement mechanism framework 10, so as to reduce the movement gap between the rod body and the framework, ensure the accurate alignment of the locking member and the gear groove, and the arrangement of the convex rib 61 further improves the assembly strength and assembly precision between the rod body and the framework.

[0075] The above describes the basic principles, main features and advantages of the application. It should be understood by those skilled in the art that the application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the claimed application. The scope of protection claimed by the application is defined by the appended claims and their equivalents.

Claims

1. A four-way motion headrest mechanism, characterized in that, include: The device includes a motion mechanism frame, a headrest rod, front and rear guide rods, and a locking assembly. 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 forward and backward relative to the motion mechanism frame. The locking assembly is connected to the motion mechanism frame, and the locking assembly includes a manual locking bar, a first locking member, and a second locking member; 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, so as to lock or unlock the movement of the front and rear guide rods; 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. 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.

2. The four-way motion headrest mechanism as described in claim 1, 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.

3. The four-way motion headrest mechanism as described in claim 2, 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.

4. The four-way motion headrest mechanism as described in claim 2, 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.

5. The four-way motion headrest mechanism as described in claim 4, 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.

6. The four-way motion headrest mechanism as described in any one of claims 1-5, 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.

7. The four-way motion headrest mechanism as described in claim 6, characterized in that, 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 four-way motion headrest mechanism as described in any one of claims 2-5, 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.

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