Front-back adjusting device of seat headrest and seat

Abstract

The utility model discloses a front-back adjusting device of a seat headrest and a seat. The adjusting device comprises a first connecting seat, a second connecting seat, a clamping piece and an elastic piece. The first connecting seat is provided with an accommodating groove, and the second connecting seat is provided with a guide groove; the guide groove comprises a front end part, a rear end part, a first edge and a second edge; a plurality of clamping grooves are formed in the second edge, and each clamping groove comprises a blocking wall; a guide section is formed in the guide groove; the clamping piece comprises a movable block and a clamping column; when the clamping column is embedded in the clamping groove, the clamping column abuts against the blocking wall, and the movable block abuts against the front side of the containing groove. A locking part is arranged on the periphery of the accommodating groove, and is used for locking the movable block to limit the swinging degree of freedom of the movable block in the accommodating groove when the movable block slides backwards to a preset position in the accommodating groove; the elastic piece is used for applying elastic stress to the movable block. The headrest solves the problem that in the prior art, the headrest is prone to abnormal backward movement due to the fact that the headrest is pressed by the head of a user.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a front-rear adjustment device for a seat headrest and a seat. Background Art

[0002] Current office chairs and gaming chairs are usually equipped with headrests to support the user's head and neck to improve the comfort of the chair. The headrests of most existing chairs are fixed to the top of the seat back, which makes it difficult to meet the user's individual needs.

[0003] In order to adapt to different sitting postures of users, the headrests of some seats can be arranged to be able to be adjusted forward and backward as needed. The existing seat forward and backward adjustment devices are usually implemented by a telescopic mechanism. For example, in some seats, a telescopic mechanism is arranged between the headrest and the seat back, and the front and rear position of the headrest is adjusted by the telescopic length of the telescopic mechanism. The telescopic mechanism is provided with a spring pin or other elastic member for locking the telescopic mechanism in its radial direction. Although this headrest forward and backward adjustment device can achieve the purpose of adjusting the front and rear position of the headrest, it locks the telescopic mechanism through the elastic stress of the elastic member. When the seat is in use, the telescopic mechanism needs to withstand the pressure from the user's head, resulting in the failure of the locking of the telescopic mechanism after the elastic member is squeezed. When the user's head normally presses the headrest backward, the headrest will move backward instead of normally due to the pressure, which seriously affects the normal use of the seat. Utility Model Content

[0004] The utility model aims to provide a front-rear adjustment device for a seat headrest and a seat, so as to solve the problem in the prior art that the headrest is prone to abnormal rearward movement due to the pressure of the user's head.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The front-to-back adjustment device of the seat headrest comprises a first connecting seat, a second connecting seat, a positioning member and an elastic member; the first connecting seat and the second connecting seat cooperate with each other to form a telescopic mechanism that can be extended or contracted in the front-to-back direction;

[0007] The first connecting seat is provided with a receiving groove, and the second connecting seat is provided with a guide groove; the guide groove includes a front end portion, a rear end portion directly opposite to the front end portion, a first side connected to one side of the front end portion and the rear end portion, and a second side opposite to the first side; a plurality of clamping grooves arranged along the front-to-back direction are provided on the second side, and the clamping groove includes a retaining wall extending from the second side toward a direction away from the first side, the retaining wall extending along the width direction of the guide groove, or the retaining wall gradually deflects backward from an end connected to the second side to an end away from the second side; a portion of the guide groove between the frontmost clamping groove and the front end portion forms a guiding section;

[0008] The locking member comprises a movable block embedded in the receiving groove, and a locking column extending from the movable block to the guide groove, the movable block being configured to be able to swing in the receiving groove so that the locking column can swing between a locking position embedded in the locking groove and an unlocking position detached from the locking groove and facing the front and rear of the guiding section, and can slide in the front and rear directions inside the receiving groove; the locking column is used to cooperate with the guiding section when placed in the guiding section to form a limiting mechanism for limiting the swinging freedom of the movable block in the receiving groove; when the locking column is embedded in the locking groove, the locking column abuts against the retaining wall and the movable block abuts against the front side of the receiving groove;

[0009] A locking portion is provided on the periphery of the receiving groove, and the locking portion is used to lock the movable block when the movable block slides backward to a predetermined position inside the receiving groove to limit the freedom of the movable block to swing inside the receiving groove;

[0010] The elastic member is used to apply elastic stress to the movable block so that the locking column always maintains a tendency to swing in a direction away from the first side.

[0011] Preferably, the receiving groove includes a front end wall located on the front side thereof and a rear end wall opposite to the front end wall, the front end wall is provided with a front groove which is recessed forward, and the locking portion is a rear groove which is recessed backward from the rear end wall and opposite to the front groove; the movable block includes a rotating end which is embedded in the front groove and can rotate in the front groove, and a positioning end opposite to the rotating end, and the positioning end can be embedded in the rear groove as the movable block moves backward to limit the freedom of rotation of the rotating end in the front groove.

[0012] Preferably, the front groove is square, and the outer peripheral surface of the rotating end is arranged to be arc-shaped so that the rotating end can rotate in the square front groove.

[0013] Preferably, a chamfer is formed at the junction of the rear groove and the rear end wall, and the chamfer avoids the positioning end when the positioning end swings with the movable block so that the positioning end can abut against the rear end wall when the positioning column is embedded in the slot.

[0014] Preferably, the slot further comprises a guide wall, which extends obliquely from one end of the retaining wall away from the second side to the second side, and the guide wall is used to push the locking post from the top of the slot into the guide slot when the locking post moves forward in the slot.

[0015] Preferably, the cross section of the locking column is in the shape of an elongated strip, and the two sides of the guiding section respectively cooperate with the two sides of the locking column to limit the locking column so that the length direction of the cross section of the locking column is consistent with the front-rear direction.

[0016] Preferably, the elastic member is a spring, and a mounting groove is provided on the first connecting seat, one end of the mounting groove extends to the receiving groove, and the other end is a blind end, and a recessed position facing the mounting groove is provided on the movable block, and the spring is embedded in the mounting groove, and one end of the spring abuts against the blind end of the mounting groove, and the other end extends from the mounting groove into the recessed position and abuts against the movable block.

[0017] Preferably, the first connecting seat includes a top wall and a bottom wall opposite to the top wall, and a through groove extending forward and backward is formed between the top wall and the bottom wall. The second connecting seat is connected to the through groove so that the first connecting seat and the second connecting seat are nested together. The receiving groove is arranged on the bottom wall of the first connecting seat, and the guide groove is arranged on the lower surface of the second connecting seat.

[0018] Preferably, a cover plate sealing the bottom of the receiving groove is fixed on the bottom wall of the first connecting seat, and the cover plate and the bottom wall are detachably fixed together. A spring plate and a push rod are provided on the cover plate, one end of the spring plate is connected to the cover plate, and the other end forms a free end, the push rod is connected to the free end of the spring plate and extends toward the second connecting seat, and a sliding groove for the push rod to penetrate is provided on the lower surface of the second connecting seat, and the front end portion of the sliding groove forms an inclined surface for stopping the push rod, and the inclined surface gradually tilts upward from front to back.

[0019] Preferably, a fixing sleeve is fixedly connected to the second connecting seat, and a protective sleeve is detachably fixed inside the fixing sleeve. The protective sleeve is arranged on the outside of the first connecting seat, and a bottom cover detachably fixed to the bottom wall of the first connecting seat is arranged below the cover plate, and the bottom cover is located above the bottom of the protective sleeve.

[0020] Preferably, a plurality of wear-resistant strips are detachably fixed on the top surface of the second connecting seat, the wear-resistant strips abut against the lower surface of the top wall of the first connecting seat, and the wear-resistant strips extend in the front-to-back direction and are wavy.

[0021] The seat comprises a headrest, a backrest and a front-rear adjustment device for the headrest, wherein the headrest is connected to a first connecting seat, and a second connecting seat is connected to the backrest.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The retaining wall of the card slot stops the locking column, which can effectively prevent the locking column from detaching from the card slot. When an external force causes the first connecting seat and the second connecting seat to shrink, the locking piece can be stably placed between the first connecting seat and the second connecting seat to lock them, preventing the telescopic mechanism from shrinking abnormally when under pressure, thereby solving the problem in the prior art that the headrest is prone to abnormal rearward movement due to pressure from the user's head, ensuring that the seat headrest can be used normally.

[0024] When the seat headrest needs to be adjusted, the first connecting seat is pulled forward so that when the first connecting seat moves forward to the extreme position, the locking column can be disengaged from the locking groove, and the front and rear adjustment process of the seat headrest is quick and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the first connecting seat;

[0027] Figure 3 for Figure 1 A schematic diagram of the cooperation between the first connecting seat and the locking member;

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of the second connecting seat;

[0029] Figure 5 for Figure 1 A schematic diagram of the structure of the middle clamping member;

[0030] Figure 6a , Figure 6b A schematic diagram of a working state of the utility model;

[0031] Figure 7a , Figure 7b This is another working state schematic diagram of the utility model;

[0032] Figure 8 It is a cross-sectional view of the utility model;

[0033] Fig. 9 for Figure 1 Schematic diagram of the structure of the middle cover;

[0034] Fig.10 This is a view of the second connecting socket of the utility model from another perspective. DETAILED DESCRIPTION

[0035] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] like Figure 1 , 2 As shown in Figures 3, 4 and 5, a front and rear adjustment device for a seat headrest of the utility model is provided, which includes a first connecting seat 10, a second connecting seat 20, a locking member 30 and a spring 40. The first connecting seat 10 and the second connecting seat 20 cooperate with each other to form a telescopic mechanism that can be extended or contracted along the front and rear direction (i.e., the X direction in the figure). By extending or contracting the telescopic mechanism front and rear, the front and rear adjustment of the seat headrest position can be achieved to meet the different sitting posture requirements of the user, and the first connecting seat 10 and the second connecting seat 20 are laterally locked by the locking member 30.

[0039] Specifically, a receiving groove 11 is provided on the first connecting seat 10, and a guide groove 21 extending along the X direction is provided on the second connecting seat 20, and the width direction of the guide groove 21 is the Y direction in the figure, wherein the guide groove 21 is configured as a long strip structure extending along the X direction, which includes a front end portion 213, a rear end portion 214 opposite to the front end portion 213, a first side 211 connected to one side of the front end portion 213 and the rear end portion 214, and a second side 212 opposite to the first side 211, that is, the first side 211 and the second side 212 are respectively located on both sides of the Y direction of the guide groove 21, and a plurality of card grooves 215 arranged along the front-to-back direction are provided on the second side 212, each card groove 215 includes a retaining wall 216, and the retaining wall 216 extends from the second side 212 of the guide groove 21 in a direction away from the first side 211, and the extending direction of the retaining wall 216 is consistent with the above-mentioned Y direction, and the plurality of card grooves 215 are not arranged The guide groove 21 is filled with a plurality of pieces of adhesive tape 22a, 22b, 22c, 22d, 22d, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e, 22e,

[0040] For ease of understanding, in this embodiment, the state of the movable block 31 when the locking column 32 is located in the slot 215 is referred to as a skewed state, and the state of the movable block 31 when the locking column 32 is placed in the guide groove 21 (that is, when the locking column 32 is not embedded in the slot 215) is referred to as an aligned state. By swinging the movable block 31 between the aligned state and the skewed state in the receiving groove 11, the locking column 32 swings with the movable block 31, and swings between a locked position in which it is embedded in the slot 215 and engaged with the slot 215, and an unlocked position in which it is located in the guide groove 21 and disengaged from the slot 215.

[0041] In short, the locking column 32 is embedded in the locking groove 215, which can be used to lock the first connecting seat 10 and the second connecting seat 20. When the locking column 32 is disengaged from the locking groove 215, the first connecting seat 10 and the second connecting seat 20 are in an unlocked state; through the sufficient activity space provided inside the receiving groove 11, the movable block 31 can not only do the above-mentioned swing after being installed in the receiving groove 11, but also slide back and forth inside the receiving groove 11 in the X direction; when the first connecting seat 10 and the second connecting seat 20 extend or contract along the X direction, the locking member 30 can move with the first connecting seat 10 relative to the second connecting seat 20, so that the locking column 32 on the locking member 30 can be embedded in the guide groove 21 and slide along the length direction of the guide groove 21, that is to say, the locking column 32 can slide along the guide groove 21 into the guide section 218 at the front of the guide groove 21. When the locking column 32 is located in the guide section 218, the locking column 32 and the guide section 218 cooperate to form a limiting mechanism to limit the freedom of the movable block 31 to swing inside the receiving groove 11, so that the locking column 32 is in the above-mentioned alignment state. The limiting mechanism composed of the locking column 32 and the guide section 218 achieves the purpose of preventing the locking column 32 from swinging inside the guide section 218 based on the mutually matching appearance of the two, and then uses the guide section 218 to limit the locking column 32, and finally realizes the limitation of the swing freedom of the movable block 31.

[0042] On the contrary, when the locking column 32 is located at a position other than the guiding section 218 inside the guide groove 21 (i.e., the position where the locking groove 215 is set), since the locking groove 215 forms a recessed structure on the second side 212 to reserve sufficient space for the swing of the locking column 32, the locking column 32 can swing along the Y direction shown in the figure and fall into the locking groove 215, that is, the locking column 32 has the freedom to swing from the aligned state to the deflected state inside the guide groove 21, and the above-mentioned spring 40 provides corresponding force for the swing of the locking column 32 to prompt the locking column 32 to perform the above-mentioned swinging action. When the locking column 32 is in a certain locking slot 215, the locking column 32 abuts against the front side of the above-mentioned retaining wall 216, and the movable block 31 is in a deflected state along with the locking column 32. The front end of the movable block 31 abuts against the front side of the receiving slot 11. The movable block 31 and the locking column 32 make the locking member 30 form a pin similar to extending along the Z direction and horizontally inserting the first connecting seat 10 and the second connecting seat 20; the above content describes that the movable block 31 can slide back and forth in the X direction inside the receiving slot 11, and a locking portion is provided on the periphery of the receiving slot 11. The locking portion is used to lock the movable block 31 when the movable block 31 slides backward to a predetermined position inside the receiving slot 11 to limit the freedom of the movable block 31 to swing inside the receiving slot 11.

[0043] As mentioned above, the spring 40 is used to apply an elastic stress to the movable block 31. Under the elastic stress of the spring 40, the movable block 31 always has a tendency to swing toward the above-mentioned deflected state, and then the locking column 32 always maintains a tendency to swing toward the first side 211 away from the guide groove 21. When the locking column 32 does not slide into the guide section 218 and the movable block 31 is not locked by the locking portion of the receiving groove 11, the elastic stress applied by the spring 40 to the movable block 31 can make the movable block 31 in the above-mentioned deflected state, and then the locking column 32 can always maintain a tendency to swing toward the first side 211 away from the guide groove 21. The positioning post 32 is embedded in one of the slots 215. At this time, the positioning member 30 is used to form a plug-in structure to horizontally insert the first connecting seat 10 and the second connecting seat 20 along the Z direction. When the positioning post 32 is located in the guiding section 218, or the movable block 31 is locked by the locking portion of the receiving groove 11, the movable block 31 is in the above-mentioned alignment state. Due to the limitation of the limiting mechanism composed of the guiding section 218 and the positioning post 32, and the limitation of the locking portion on the receiving groove 11, the elastic stress of the spring 40 cannot push the movable block 31 to a deflected state.

[0044] Figure 6a , 6b 7a and 7b show schematic diagrams of the above-mentioned regulating device of the utility model in different states. Figure 6a , 6b The schematic diagram shows that the movable block 31 is in a skewed state. The skewed state of the movable block 31 means that there is an angle between the length direction of the movable block 31 and the X direction, so as to facilitate further connection. Figure 6a It is used to show the matching relationship between the locking member 30 and the second connecting seat 20 in this state. Figure 6b Used to demonstrate the matching relationship between the locking member 30 and the first connecting seat 10 in this state, the locking column 32 is embedded in one of the slots 215, and the locking column 32 abuts against the front side of the retaining wall 216 of the slot 215, and the front end of the movable block 31 abuts against the front side of the receiving groove 11; when an external force F is applied to the first connecting seat 10 from front to back, the external force F pushes the first connecting seat 10 backward and is transmitted to the movable block 31 through the front side of the receiving groove 11, and the external force is transmitted to the retaining wall 216 via the locking column 32. Since the retaining wall 216 extends along the Y direction, the direction of the external force F is perpendicular to the extension direction of the retaining wall 216, so that the locking member 30 can be stably clamped between the first connecting seat 10 and the second connecting seat 20.

[0045] That is to say, when the movable block 31 is in a skewed state, when the telescopic mechanism composed of the first connecting seat 10 and the second connecting seat 20 is subjected to an external force F that causes the two to have a contraction tendency, the locking member 30 acts as a latch-like structure that is inserted horizontally into the first connecting seat 10 and the second connecting seat 20, effectively preventing the telescopic mechanism from contracting abnormally.

[0046] When used in a seat, the headrest of the seat is connected to the first connecting seat 10, and the second connecting seat 20 is connected to the seat back. The relative positions of the first connecting seat 10 and the second connecting seat 20 are adjusted to appropriate positions so that the headrest meets the user's comfortable sitting posture requirements. The user's head presses the headrest backwards, and the first connecting seat 10 is subjected to a backward external force F. The first connecting seat 10 can be effectively prevented from moving backwards by the locking member 30.

[0047] Figure 7a , 7b The state of the first connection seat 10 and the second connection seat 20 during the adjustment process is shown. Figure 6a , 6b In the state shown, when the user needs to adjust the headrest forward, he can pull the first connecting seat 10 forward along the X direction to make the locking column 32 fall into the front locking groove 215. Figure 6a , 6b In the state shown, the headrest is positioned relatively forward. When the user needs to adjust the headrest backward, he can Figure 7a , 7b As shown, the first connecting seat 10 is pulled forward to the limit position.

[0048] For ease of understanding, Figure 7a The figure shows the matching relationship between the locking member 30 and the second connecting seat 20 at the extreme position. Figure 7b The figure shows the matching relationship between the locking member 30 and the first connecting seat 10 at the extreme position. When the first connecting seat 10 is pulled forward, the first connecting seat 10 drives the locking member 30 to move forward, so that the locking column 32 of the locking member 30 slides into the guiding section 218 of the guide groove 21. The guiding section 218 cooperates with the locking column 32 to make the movable block 31 move from Figure 6a The deflection state shown swings to Figure 7a In the alignment state shown, the locking column 32 moves along the guiding section 218 to abut against the front end portion 213 of the guide groove 21. Since the movable block 31 can have the freedom to move forward and backward inside the receiving groove 11 in the alignment state, the first connecting seat 10 continues to be pulled forward, and the front end portion 213 of the guide groove 21 abuts against the locking column 32 and pushes the locking column 32 backward, so that the movable block 31 moves backward inside the receiving groove 11. After the forward movement of the first connecting seat 10 is finally completely limited, the movable block 31 moves backward so that the locking portion on the receiving groove 11 locks the movable block 31. At this time, the movable block 31 is still in the alignment state even under the elastic stress of the spring 40.

[0049] For further convenience of understanding, the alignment state can be regarded as that the length direction of the movable block 31 is consistent with the X direction in the figure. Figure 7a , 7bWhen the movable block 31 is locked by the locking portion of the receiving groove 11, the first connecting seat 10 is pushed backward all the way, and the first connecting seat 10 drives the movable block 31 to move backward, so that the locking column 32 moves along the guide groove 21 to the position where the rear end portion 214 of the guide groove 21 contacts the locking column 32, so that the movable block 31 moves forward inside the receiving groove 11 to disengage the movable block 31 from the locking portion of the receiving groove 11, and the movable block 31 no longer constrained by the locking portion swings from the aligned state to the deflected state under the elastic stress of the spring 40, and the locking column 32 falls into the locking groove 215 on the rear side. At this time, the first connecting seat 10 can be pulled forward to move the headrest forward to a position suitable for the user's comfortable sitting posture, and the locking column 32 falls into the corresponding locking groove 215, and Figure 6a , 6b The state shown is the same, and the first connecting seat 10 and the second connecting seat 20 are locked by using the locking member 30 to prevent the first connecting seat 10 and the second connecting seat 20 from contracting against each other when the headrest is squeezed backwards, and at the same time, when the first connecting seat 10 is pulled forwards, the first connecting seat 10 and the second connecting seat 20 can be easily stretched to extend along the X direction.

[0050] Compared with the existing seat headrest front and rear adjustment device, the utility model stops the locking column 32 through the retaining wall 216 of the slot 215, which can effectively prevent the locking column 32 from detaching from the slot 215. When an external force causes the first connecting seat 10 and the second connecting seat 20 to shrink, the locking member 30 can be stably placed between the first connecting seat 10 and the second connecting seat 20 to lock the two, preventing the telescopic mechanism from shrinking abnormally when under pressure, thereby ensuring that the seat headrest can be used normally.

[0051] When the seat headrest needs to be adjusted, the first connecting seat 10 is pulled forward so that when the first connecting seat 10 moves forward to the limit position, the locking column 32 can be disengaged from the locking groove 215, and the front and rear adjustment process of the seat headrest is quick and labor-saving.

[0052] See also Figure 2 , 3 As shown in Figure 5, in a preferred embodiment, the receiving groove 11 of the utility model includes a front end wall 111 and a rear end wall 112 opposite to the front end wall 111, the front end wall 111 is provided with a front groove 113 recessed forward, and the rear end wall 112 is provided with a rear groove 114 recessed backward, the rear groove 114 is the above-mentioned locking portion, and the rear groove 114 is arranged front and rear to front of the front groove 113; the movable block 31 includes a rotating end 311 located at its front end and a positioning end 312 opposite to the rotating end 311, the rotating end 311 is embedded in the front groove 113 and the rotating end 311 can rotate inside the front groove 113, so as to realize the swingable configuration of the movable block 31 into the receiving groove 11.

[0053] At the same time, based on the structure in which the front groove 113 is recessed forward by the front end wall 111, and the structure in which the rear groove 114 is recessed backward by the rear end wall 112 and is directly opposite to the front groove 113, when the movable block 31 is in the above-mentioned alignment state, the movable block 31 can have the freedom to move forward and backward along X inside the receiving groove 11.

[0054] For example, the distance between the front wall surface of the front groove 113 and the rear wall surface of the rear groove 114 can be set to D, and the distance between the rotating end 311 and the positioning end 312 of the movable block 31 can be set to L (that is, the length of the movable block 31 is L), so that D is greater than L. In this way, when the movable block 31 is in the aligned state, the front wall surface of the front groove 113 and the rear wall surface of the rear groove 114 can provide sufficient space for the forward and backward movement of the movable block 31. When the movable block 31 moves backward in the receiving groove 11, the positioning end 312 can be inserted into the rear groove 114. The rear groove 114 and the positioning end 312 are used to cooperate to limit the swinging freedom of the movable block 31, that is, the freedom of rotation of the rotating end 311 in the front groove 113 is limited.

[0055] In addition, by setting the size of the rotating end 311 of the movable block 31 and the front groove 113, when the positioning end 312 is inserted into the rear groove 114, the rotating end 311 is prevented from being separated from the front groove 113, and the front groove 113 and the rotating end 311 cooperate with each other to limit the swinging freedom of the movable block 31; in order to set the rotating end 311 to be rotatable in the front groove 113 and ensure that the rotating end 311 can move back and forth inside the front groove 113, the utility model sets the front groove 113 to a square structure, and the outer peripheral surface of the rotating end 311 is set to an arc shape, so that the rotating end 311 can rotate in the square front groove 113.

[0056] For example, the rotating end 311 can be set to be fan-shaped so that its right side forms an arc of a quarter circle. In this way, when the movable block 31 swings to the left, the rotating end 311 of the fan-shaped structure will not be blocked by the inner wall of the square front groove 113, ensuring that the rotating end 311 can rotate flexibly inside the front groove 113.

[0057] In some other embodiments, the movable block 31 is configured to be able to swing inside the receiving groove 11 and to be able to move forward and backward inside the receiving groove 11 along the X direction, which can also be achieved through other structures. For example, a long strip-shaped slide groove can be provided on the movable block 31, and a rotating shaft that is slidably embedded in the slide groove and extends along the Z direction is provided inside the receiving groove 11, and the cross section of the rotating shaft is circular so that the rotating shaft can rotate in the slide groove. The locking lever 312 is in the state of being pushed against the locking lever 314 when the locking lever 312 is in the state of being pushed against the locking lever 314, so that the locking lever 312 can be locked in the locking lever 314 by the locking lever 314 when the locking lever 314 is in the state of being pushed against the locking lever 314.

[0058] Specifically, the rotating end 311 abuts against the front wall surface of the front groove 113, and the positioning end 312 abuts against the rear end wall 112, so that the movable block 31 can be more stably abutted against the inside of the receiving groove 11, so that the locking of the first connecting seat 10 and the second connecting seat 20 by the locking member 30 is more stable, and the first connecting seat 10 is further prevented from moving abnormally when being pushed backward.

[0059] See also Figure 4 As shown, the slot 215 also includes a guide wall 217, which extends obliquely from one end of the retaining wall 216 away from the second side 212 to the second side 212. As a result, the retaining wall 216 and the guide wall 217 are used to form a triangular structure in the slot 215. When the headrest needs to be adjusted forward, the first connecting seat 10 is pulled forward, and the first connecting seat 10 drives the locking member 30 to move forward. The inclined guide wall 217 pushes the locking column 32 toward the direction of the first side 211 close to the guide slot 21, so that the locking column 32 can swing outward while moving forward, and then disengage from the slot 215. In this way, the first connecting seat 10 can be easily pulled forward, making the adjustment of the headrest easy and labor-saving.

[0060] In other embodiments, the above-mentioned retaining wall 216 is configured to form an angle with the above-mentioned Y direction, so that when the first connecting seat 10 is subjected to the backward force F, the retaining wall 216 can better support the locking column 32 to prevent the locking column 32 from detaching from the retaining wall 216 and sliding out of the slot 215, causing abnormal backward movement of the first connecting seat 10. Specifically, the retaining wall 216 gradually deflects backward from the end connected to the second side 212 toward the end away from the second side 212. When the first connecting seat 10 is subjected to the backward force F, guided by the inclined retaining wall 216, the locking column 32 only has a tendency to slide toward the side of the retaining wall 216 away from the second side 212.

[0061] See also Figure 7a The locking column 32 is configured to have a long strip-shaped cross section. The two sides of the guiding section 218 are respectively matched with the two sides of the locking column 32, so that the guiding section 218 limits the locking column 32 to prevent the locking column 32 from rotating in the guiding section 218. When the locking column 32 slides into the guiding section 218 from back to front, the guiding section 218 guides the locking column 32 so that the movable block 31 in a skewed state gradually swings to an aligned state. When the locking column 32 completely slides into the guiding section 218, the length direction of the cross section of the locking column 32 is consistent or basically consistent with the front-to-back direction (i.e., the X direction).

[0062] See also Figure 3 , 5 As shown, in order to facilitate the installation of the spring 40 and enable the spring 40 to provide a better elastic stress for pushing the movable block 31, a mounting groove 12 is provided on the first connecting seat 10, one end of the mounting groove 12 extends to the receiving groove 11, and the other end is a blind end. A recess 313 facing the mounting groove 12 is provided on the movable block 31, and the spring 40 is embedded in the mounting groove 12, one end of the spring 40 abuts against the blind end of the mounting groove 12, and the other end extends from the mounting groove 12 into the recess 313 and abuts against the movable block 31. The spring 40 is limited by the recess 313 to prevent the spring 40 from being separated from the movable block 31 when the movable block 31 moves back and forth inside the receiving groove 11. In other embodiments, the spring 40 can also be other elastic members, such as elastic rubber blocks, retaining springs, gas springs, etc., in short, as long as it can provide sufficient elastic stress to push the movable block 31.

[0063] See also Figure 1 , 4As shown in Figures 8 and 9, the first connecting seat 10 and the second connecting seat 20 are preferably nested in each other to form a telescopic mechanism to prevent them from detaching from each other in the Y and Z directions. The nesting method can provide better guidance for the extension and contraction of the two. For example, the first connecting seat 10 includes a top wall 101 and a bottom wall 102 opposite to the top wall 101. The top wall 101 and the bottom wall 102 form a through groove extending forward and backward. The second connecting seat 20 is inserted into the through groove from back to front, and then the first connecting seat 10 and the second connecting seat 20 are nested together. The receiving groove 11 is arranged on the bottom wall 102 of the first connecting seat 10, and the guide groove 21 is arranged on the lower surface of the second connecting seat 20.

[0064] A cover plate 50 is fixedly connected to the bottom wall 102 of the first connecting seat 10 and covers the bottom of the receiving groove 11. The cover plate 50 and the bottom wall 102 are detachably fixed together. During assembly, after the locking member 30 and the spring 40 are installed in place, the cover plate 50 is fixed to the bottom wall 102 by screws or buckles to prevent the locking member 30 and the spring 40 from detaching from the first connecting seat 10.

[0065] The cover plate 50 is provided with an elastic sheet 51 and a push rod 52. One end of the elastic sheet 51 is connected to the cover plate 50, and the other end forms a free end. The push rod 52 is connected to the free end of the elastic sheet 51 and extends upward toward the second connecting seat 20. A slide groove 22 for the push rod 52 to penetrate is provided on the lower surface of the second connecting seat 20. The front end of the slide groove 22 forms an inclined surface 221, and the inclined surface 221 gradually tilts upward from front to back. When the first connecting seat 10 is moved forward, the push rod 52 slides forward along the slide groove 22. When the first connecting seat 10 moves forward relative to the second connecting seat 20 to a position close to the limit, , the locking column 32 is about to contact the front end 213 of the guide groove 21. At this time, the push rod 52 slides to the front end of the slide groove 22 and contacts the inclined surface 221. The inclined surface 221 squeezes the push rod 52 installed on the spring sheet 51 to form a damping feeling. When used to adjust the first connecting seat 10 forward, the damping feeling formed by the inclined surface 221 on the push rod 52 reminds the user that the locking column 32 is about to contact the front end 213 of the guide groove 21, thereby preventing the user from using excessive force when moving the first connecting seat 10 forward, causing the locking column 32 to violently hit the front end 213 of the guide groove 21. In this way, the locking column 32 is protected.

[0066] A fixing sleeve 70 is fixedly connected to the second connecting seat 20, and the fixing sleeve 70 can be used to connect the second connecting seat 20 to the backrest of the seat. A protective sleeve 80 is fixed inside the fixing sleeve 70 by means of snap connection or screw connection. The protective sleeve 80 is sleeved on the outside of the first connecting seat 10. A bottom cover 60 that is detachably fixed to the bottom wall 102 of the first connecting seat 10 is provided below the cover plate 50. The bottom cover 60 is located above the bottom of the protective sleeve 80. By providing the fixing sleeve 70 and making the protective sleeve 80 on the fixing sleeve 70 sleeved on the outside of the first connecting seat 10, the assembly formed by the fixing sleeve 70 and the second connecting seat 20 forms a double sleeve structure with the first connecting seat 10, so that the extension and contraction of the first connecting seat 10 and the second connecting seat 20 are smoother.

[0067] It should be pointed out that, in other embodiments, the second connecting seat 20 can also be sleeved on the first connecting seat 10 so that the two form a telescopic mechanism; sleeveing ​​the first connecting seat 10 and the second connecting seat 20 together is a preferred embodiment of the utility model. In other embodiments, the first connecting seat 10 and the second connecting seat 20 do not necessarily form a telescopic mechanism by sleeveing ​​each other.

[0068] like Fig.10 As shown, a plurality of wear-resistant strips 23 are detachably fixed on the top surface of the second connecting seat 20, and the wear-resistant strips 23 extend along the X direction, and the wear-resistant strips 23 abut against the lower surface of the top wall 101 of the first connecting seat 10. By setting the wear-resistant strips 23, the contact area between the first connecting seat 10 and the second connecting seat 20 is reduced, thereby reducing the friction therebetween, and further improving the flexibility of the first connecting seat 10 and the second connecting seat 20 in extending and contracting. The wear-resistant strips 23 are configured as a replaceable structure, and new wear-resistant strips 23 are replaced after wear to reduce the fitting clearance between the first connecting seat 10 and the second connecting seat 20. In addition, the wear-resistant strips 23 are configured as a wavy structure, which further reduces the contact area with the first connecting seat 10, thereby reducing the friction.

[0069] The seat of the present invention includes a headrest, a backrest and the fore-and-aft adjustment device of the headrest. The headrest is connected to a first connecting seat 10, and a second connecting seat 20 is connected to the backrest. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0070] Finally, it should be noted that the above-mentioned implementation modes are only optional embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. The front and rear adjustment device of the seat headrest is characterized in that: It includes a first connecting seat, a second connecting seat, a positioning member and an elastic member; the first connecting seat and the second connecting seat cooperate with each other to form a telescopic mechanism that can be extended or contracted in the front-back direction; The first connecting seat is provided with a receiving groove, and the second connecting seat is provided with a guide groove; the guide groove includes a front end portion, a rear end portion directly opposite to the front end portion, a first side connected to one side of the front end portion and the rear end portion, and a second side opposite to the first side; a plurality of clamping grooves arranged along the front-to-back direction are provided on the second side, and the clamping groove includes a retaining wall extending from the second side toward a direction away from the first side, the retaining wall extending along the width direction of the guide groove, or the retaining wall gradually deflects backward from an end connected to the second side to an end away from the second side; a portion of the guide groove between the frontmost clamping groove and the front end portion forms a guiding section; The locking member comprises a movable block embedded in the receiving groove, and a locking column extending from the movable block to the guide groove, the movable block being configured to be able to swing in the receiving groove so that the locking column can swing between a locking position embedded in the locking groove and an unlocking position detached from the locking groove and facing the front and rear of the guiding section, and can slide in the front and rear directions inside the receiving groove; the locking column is used to cooperate with the guiding section when placed in the guiding section to form a limiting mechanism for limiting the swinging freedom of the movable block in the receiving groove; when the locking column is embedded in the locking groove, the locking column abuts against the retaining wall and the movable block abuts against the front side of the receiving groove; A locking portion is provided on the periphery of the receiving groove, and the locking portion is used to lock the movable block when the movable block slides backward to a predetermined position inside the receiving groove to limit the freedom of the movable block to swing inside the receiving groove; The elastic member is used to apply elastic stress to the movable block so that the locking column always maintains a tendency to swing in a direction away from the first side.

2. The front and rear adjustment device of the seat headrest according to claim 1, characterized in that: The receiving groove includes a front end wall located on the front side thereof and a rear end wall opposite to the front end wall, the front end wall is provided with a front groove which is recessed forward, and the locking portion is a rear groove which is recessed backward from the rear end wall and opposite to the front groove; the movable block includes a rotating end which is embedded in the front groove and can rotate in the front groove, and a positioning end opposite to the rotating end, and the positioning end can be embedded in the rear groove as the movable block moves backward to limit the freedom of rotation of the rotating end in the front groove.

3. The front and rear adjustment device of the seat headrest according to claim 2, characterized in that: The front groove is in a square shape, and the outer peripheral surface of the rotating end is arranged in an arc shape so that the rotating end can rotate in the square front groove.

4. The front and rear adjustment device of the seat headrest according to claim 2, characterized in that: A chamfer is formed at the junction of the rear groove and the rear end wall. The chamfer avoids the positioning end when the positioning end swings with the movable block so that the positioning end can abut against the rear end wall when the positioning column is embedded in the slot.

5. The front-rear adjustment device for a seat headrest according to claim 1, characterized in that: The slot also includes a guide wall, which extends obliquely from one end of the retaining wall away from the second side to the second side, and is used to push the locking post from the top of the slot into the guide slot when the locking post moves forward in the slot.

6. The front-rear adjustment device for a seat headrest as claimed in claim 1, characterized in that: The cross section of the positioning column is in the shape of a long strip, and the two sides of the guiding section respectively cooperate with the two sides of the positioning column to limit the positioning column so that the length direction of the cross section of the positioning column is consistent with the front-back direction.

7. The front-rear adjustment device for a seat headrest as claimed in claim 1, characterized in that: The elastic member is a spring, and a mounting groove is provided on the first connecting seat. One end of the mounting groove extends to the receiving groove and the other end is a blind end. A recessed position facing the mounting groove is provided on the movable block. The spring is embedded in the mounting groove, and one end of the spring abuts against the blind end of the mounting groove, and the other end extends from the mounting groove into the recessed position and abuts against the movable block.

8. The front-rear adjustment device for a seat headrest as claimed in claim 1, characterized in that: The first connecting seat includes a top wall and a bottom wall opposite to the top wall, and a through groove extending forward and backward is formed between the top wall and the bottom wall. The second connecting seat is connected to the through groove so that the first connecting seat and the second connecting seat are nested together. The receiving groove is arranged on the bottom wall of the first connecting seat, and the guide groove is arranged on the lower surface of the second connecting seat.

9. The front-rear adjustment device for a seat headrest as claimed in claim 8, characterized in that: A cover plate sealing the bottom of the receiving groove is fixed on the bottom wall of the first connecting seat, and the cover plate and the bottom wall are detachably fixed together. A spring sheet and a push rod are arranged on the cover plate, one end of the spring sheet is connected to the cover plate, and the other end forms a free end. The push rod is connected to the free end of the spring sheet and extends toward the second connecting seat. A sliding groove for the push rod to penetrate is arranged on the lower surface of the second connecting seat, and the front end portion of the sliding groove forms an inclined surface for stopping the push rod, and the inclined surface gradually tilts upward from front to back.

10. The front-rear adjustment device of a seat headrest according to claim 9, characterized in that: A fixing sleeve is fixedly connected to the second connecting seat, and a protective sleeve is detachably fixed inside the fixing sleeve. The protective sleeve is arranged on the outside of the first connecting seat, and a bottom cover detachably fixed to the bottom wall of the first connecting seat is arranged below the cover plate, and the bottom cover is located above the bottom of the protective sleeve.

11. The front-rear adjustment device of a seat headrest according to claim 8, characterized in that: A plurality of wear-resistant strips are detachably fixed on the top surface of the second connecting seat, the wear-resistant strips abut against the lower surface of the top wall of the first connecting seat, and the wear-resistant strips extend in the front-to-back direction and are wavy.

12. A seat, characterized in that: The invention comprises a headrest, a backrest and a front-rear adjustment device of the seat headrest as claimed in any one of claims 1 to 11, wherein the headrest is connected to a first connecting seat, and the second connecting seat is connected to the backrest.

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