Front-back adjusting mechanism of seat headrest and seat

Abstract

The utility model discloses a front-back adjusting mechanism of a seat headrest and a seat. The front-back adjusting mechanism of the seat headrest comprises a first connecting seat, a second connecting seat, a locking piece and an elastic piece. A matching part and a guide piece are arranged on the second connecting seat, and the guide piece comprises a first end, a second end and a bending part; the locking piece comprises a connecting end and a matching end, and a clamping column is arranged at the matching end of the locking piece; a sliding groove is formed in the first connecting seat, the sliding groove comprises a front end wall, a rear end wall, a first side wall and a second side wall, and a plurality of clamping grooves are formed in the second side wall; the elastic piece is used for applying elastic stress to the locking piece so that the clamping column can always keep the moving trend of approaching the second side wall of the sliding groove. The headrest can be prevented from moving backwards abnormally due to the fact that the head of a user applies pressure to the headrest, and the headrest can provide good support for the head of the user. The headrest can be adjusted in place by using small thrust and tension, and the whole adjusting process of the headrest is rapid and labor-saving.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to a front-rear adjustment mechanism 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 on the top of the seat back, which is difficult to meet the individual needs of users. In order to adapt to the different sitting postures of users, the headrests of some chairs are set to be able to be adjusted forward and backward as needed. The existing seat forward and backward adjustment mechanism usually has two connecting seats that can move forward and backward, one of which is equipped with a seat headrest and the other is connected to the seat back. The two connecting seats move relative to each other in the forward and backward direction to achieve the forward and backward adjustment of the headrest. In order to enable the headrest to withstand the pressure from the user's head, it is necessary to set a structure to lock the two connecting seats to avoid abnormal backward movement of the headrest caused by the relative movement of the two connecting seats when the headrest is adjusted to the appropriate position. This requires that the component that locks the two connecting seats provide sufficient resistance for the relative movement of the two connecting seats. Although it can achieve the purpose of preventing the abnormal backward movement of the headrest, when the headrest needs to be adjusted forward and backward, a large external force is required to make the two connecting seats move relative to each other, which makes the seat extremely inconvenient to use. Utility Model Content

[0003] The utility model aims to provide a front-to-back adjustment mechanism for a seat headrest and a seat, which can make the front-to-back adjustment of the seat headrest easy and quick under the premise of solving the problem of abnormal rearward movement of the seat headrest.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The front-to-back adjustment mechanism of the seat headrest comprises a first connecting seat, a second connecting seat, a locking member and an elastic member, wherein the first connecting seat and the second connecting seat are slidably matched so that the first connecting seat and the second connecting seat have the freedom of relative movement in the front-to-back direction;

[0006] The second connecting seat is provided with a matching portion and a guide member, the guide member includes a first end, a second end, and a bending portion located between the first end and the second end, wherein the first end and the bending portion are staggered with each other in the left-right direction, and the second end is located at the front side of the bending portion;

[0007] The locking member includes a connecting end and a matching end opposite to the connecting end, the connecting end is connected to the matching portion so that the locking member can swing left and right relative to the second connecting seat and move forward and backward relative to the second connecting seat, and the matching end is slidably matched with the guide member so that the locking member slides between the first end and the bent portion when the locking member swings left and right relative to the second connecting seat, and slides between the second end and the bent portion when the locking member moves forward and backward relative to the second connecting seat; a locking column is provided on the matching end of the locking member;

[0008] The first connecting seat is provided with a slide groove extending in the front-to-back direction for the locking column to be embedded in the slide groove, which includes a front end wall, a rear end wall opposite to the front end wall, a first side wall located between one side of the front end wall and the rear end wall, and a second side wall located between the front end wall and the other side of the rear end wall. The second side wall is provided with a plurality of locking grooves arranged in the front-to-back direction for the locking column to be embedded in the locking groove. The shape of the locking groove is configured to prevent the locking column embedded in the locking groove from being disengaged from the locking groove when the first connecting seat moves backward relative to the locking column, and to enable the locking column to be ejected from the locking groove when the first connecting seat moves forward relative to the locking column; the front end wall of the slide groove is used to push the locking column when the locking column moves to the front end of the slide groove so that the matching end slides from the second end of the guide member to the bent portion, and the rear end wall of the slide groove is used to push the locking column when the locking column moves to the rear end of the slide groove so that the matching end moves from the bent portion of the guide member to the second end;

[0009] The elastic member is used to apply elastic stress to the locking member so that the locking column always maintains a movement trend of approaching the second side wall of the sliding groove.

[0010] Preferably, a through groove extending along the length direction of the locking member is provided on the connecting end of the locking member, and the matching part is a boss provided on the second connecting seat and inserted into the through groove, and the boss is cylindrical so that the boss can slide in the slide groove and the connecting end of the locking member can rotate relative to the boss.

[0011] Preferably, the second connecting seat includes an upper surface, and the first connecting seat includes a lower surface located on the upper surface; the upper surface of the second connecting seat is provided with a downwardly recessed groove, the locking piece is embedded in the groove, and the protruding column extends upward from the bottom surface of the groove; the sliding groove is formed by the upward recess of the lower surface of the first connecting seat, and the locking column protrudes from the upper surface of the second connecting seat to be inserted into the sliding groove.

[0012] Preferably, the elastic member is a spring, and a mounting post is protruding from one side of the matching end of the locking member, one end of the spring is sleeved on the mounting post, and the other end abuts against the inner wall of the groove.

[0013] Preferably, the mating end of the locking member is cylindrical, and an arc-shaped locking groove is provided on the inner wall of the groove; when the locking column is locked in the locking groove, the side of the mating end facing away from the installation column is embedded in the locking groove.

[0014] Preferably, the second connecting seat includes an upper surface, and the first connecting seat includes a lower surface located on the upper surface; the upper surface of the second connecting seat is provided with a downwardly recessed groove, and the locking member is embedded in the groove; the guide member is a guide groove arranged on the bottom surface of the groove, and a guide column slidably embedded in the guide groove is provided on the mating end of the locking member, and the guide column slides between the first end of the guide groove and the bending portion when the locking member swings left and right relative to the second connecting seat, and slides between the second end of the guide groove and the bending portion when the locking member moves forward and backward relative to the second connecting seat.

[0015] Preferably, the inner wall of the slot includes an arc-shaped inner wall extending from the second side wall in a direction away from the first side wall and with a middle portion recessed forward, and an inclined guide wall extending obliquely from one end of the arc-shaped inner wall away from the first side wall to the second side wall. The recess formed by the arc-shaped inner wall is used for the locking column to be embedded. The inclined guide wall is used to push the locking column toward the first side wall when the first connecting seat moves forward relative to the locking column so that the locking column disengages from the slot. The inclined guide wall of the slot located on the rearmost side is connected to the rear end wall of the slide slot.

[0016] Preferably, a limit seat is respectively provided on both sides of the second connecting seat, and the two limit seats are fixed on the second connecting seat in a detachable manner. An installation groove is respectively formed between the two limit seats and the second connecting seat, and the openings of the two installation grooves are arranged opposite to each other. The two side edges of the first connecting seat are respectively slidably embedded in the two installation grooves.

[0017] Preferably, the second connecting seat includes an upper surface, and the first connecting seat includes a lower surface located on the upper surface; the upper surface of the second connecting seat is detachably provided with a plurality of wear-resistant strips pressed on the lower surface of the first connecting seat, the length direction of the wear-resistant strips is consistent with the front-to-back direction, and the wear-resistant strips are wavy.

[0018] The seat comprises a headrest, a backrest and a front-rear adjustment mechanism of the headrest. The headrest is connected to a first connecting seat, and the backrest is connected to a second connecting seat.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] In the front and rear adjustment mechanism of the seat headrest of the utility model, a locking piece is arranged between the first connecting seat and the second connecting seat, and the locking piece is configured to be able to swing left and right and move forward and backward relative to the second connecting seat, so that when the first connecting seat is subjected to a backward extrusion force, the locking piece can be stably placed between the first connecting seat and the second connecting seat to prevent the first connecting seat from moving backward relative to the second connecting seat. When the user uses the seat normally, the pressure exerted by the user's head on the headrest will not cause the headrest to move backward abnormally, so that the headrest can provide better support for the user's head; when it is necessary to adjust the front and rear position of the headrest, the headrest is pulled forward to the extreme position. After the locking piece swings, it no longer locks the freedom of the first connecting seat to move backward relative to the second connecting seat. Then, the headrest is pushed backward to the extreme position, so that the locking piece returns to the state where it can lock the second connecting seat and the first connecting seat. The headrest is pulled forward to the predetermined position according to the predetermined position, so that the locking piece is automatically in the locked state to prevent the first connecting seat from moving backward relative to the second connecting seat. During the entire adjustment process, the locking piece and the second connecting seat will not produce a large resistance to the movement of the first connecting seat. The headrest can be adjusted into place using a small pushing force and pulling force. The entire adjustment process of the headrest is relatively quick and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the first connecting seat;

[0023] Figure 3 for Figure 2 A-direction view;

[0024] Figure 4 for Figure 1 A schematic diagram of the structure of the second connecting seat;

[0025] Figure 5 for Figure 1 A schematic diagram of the structure of the middle locking member;

[0026] Figure 6a to Figure 6c It is a schematic diagram of the cooperation between the second connecting seat and the locking member during the working process of the utility model;

[0027] Figure 7a to Figure 7e It is a schematic diagram of the working state of the utility model. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] like Figure 1 , 2 As shown in Figures 3, 4, and 5, a front and rear adjustment mechanism of a seat headrest of the utility model 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 are slidably matched so that the two have the freedom of relative movement in the front and rear direction (i.e., the X direction in the figure). The headrest 50 is connected to the first connecting seat 10, and the second connecting seat 20 is connected to the backrest of the seat. The front and rear position of the headrest 50 can be adjusted by sliding the first connecting seat 10 and the second connecting seat 20 relative to each other in the X direction to different positions. The locking member 30 is used to lock the first connecting seat 10 and the second connecting seat 20 after they slide relative to each other to a predetermined position.

[0032] In one embodiment, the first connecting seat 10 is arranged above the second connecting seat 20, and a boss 21 and a guide groove 22 are arranged on the second connecting seat 20. The guide groove 22 includes two sections that are at a certain angle to each other. Specifically, the guide groove 22 includes a first end 221 and a second end 223. A bending portion 222 is formed at the middle position of the guide groove 22 between the first end 221 and the second end 223. A straight extension section is formed between the first end 221 and the bending portion 222 and between the bending portion 222 and the second end 223, respectively. The straight extension section between the first end 221 and the bending portion 222 is consistent or basically consistent with the left-right direction (i.e., the Y direction in the figure), so that the first end 221 and the bending portion 222 are staggered a certain distance from each other in the Y direction; the straight extension section between the bending portion 222 and the second end 223 is consistent or basically consistent with the front-back direction (i.e., the X direction in the figure), the second end 223 is located at the front side of the bending portion 222, and the second end 223 and the bending portion 222 are staggered a certain distance in the X direction; the boss 21 is located at the rear side of the guide groove 22 and is arranged at a certain distance from the guide groove 22. The locking member 30 is located between the second connecting seat 20 and the first connecting seat 10. The locking member 30 includes a connecting end 301 and a mating end 302 opposite to the connecting end 301. The locking member 30 is configured to be a roughly strip-shaped structure so that the connecting end 301 and the mating end 302 can respectively cooperate with the boss 21 and the guide groove 22 of the second connecting seat 20. A through groove 31 is provided on the connecting end 301 of the locking member 30. The boss 21 is inserted into the through groove 31. The connecting end 301 of the locking member 30 is connected to the second connecting seat 20. The boss 21 is slidably placed in the through groove 31 so that the boss 21 can slide along the length direction of the through groove 31. At the same time, the boss 21 is configured to be cylindrical so that after the boss 21 is located in the through groove 31, the connecting end 301 of the locking member 30 can rotate around the boss 21. That is to say, through the cooperation between the boss 21 and the through groove 31, the locking member 3 The connecting end 301 of 0 can move relative to the second connecting seat 20 along the extension direction of the through groove 31, and rotate relative to the second connecting seat 20, so that the locking member 30 can swing left and right relative to the second connecting seat 20, and move forward and backward relative to the second connecting seat 20, and the above-mentioned matching end 302 is slidably embedded in the guide groove 22. Specifically, a guide column 32 can be provided on the matching end 302, and the guide column 32 is embedded in the guide groove 22. When the locking member 30 swings left and right relative to the second connecting seat 20, the guide column 32 slides inside the guide groove 22 between the first end 221 and the bent portion 222 of the guide groove 22. When the locking member 30 moves forward and backward relative to the second connecting seat 20, the guide column 32 slides inside the guide groove 22 between the second end 223 and the bent portion 222. A locking column 33 is also provided on the matching end 302 of the locking member 30;The first connecting seat 10 is provided with a slide groove 11 extending in the front-to-back direction (i.e., the X direction in the figure), and the above-mentioned locking column 33 is extended upward from the matching end 302 of the locking member 30 and then embedded in the slide groove 11, and the locking column 33 is used to lock at different positions inside the slide groove 11 to achieve the locking of the relative position of the first connecting seat 10 and the second connecting seat 20; the slide groove 11 includes a front end wall 111, a rear end wall 112 opposite to the front end wall 111, and a first end wall 112 located between the front end wall 111 and one side of the rear end wall 112. A side wall 113 and a second side wall 114 located on the other side of the front end wall 111 and the rear end wall 112, the second side wall 114 is opposite to the first side wall 113, the first side wall 113 extends along the X direction or substantially extends along the X direction, and the second side wall 114 is provided with a plurality of slots 115 formed by being recessed in a direction away from the first side wall 113, and the plurality of slots 115 are arranged along the X direction, and the above-mentioned positioning column 33 can be embedded in the slots 115, and the shape of the slots 115 is configured to be opposite to the first connecting seat 10 When the locking post 33 moves backward, the locking post 33 located in the locking groove 115 is prevented from being disengaged from the locking groove 115. When the first connecting seat 10 moves forward relative to the locking post 33, the locking post 33 can be pushed toward the first side wall 113, so that the locking post 33 is disengaged from the locking groove 115 and falls into the slide groove 11 to be close to the first side wall 113 or almost close to the first side wall 113. After the locking post 33 is disengaged from the locking groove 115, it is no longer locked with the locking groove 115, so that the locking member 30 is no longer locked to the locking groove 115. The first connecting seat 10 and the second connecting seat 20 are locked; the front end wall 111 of the slide groove 11 is used to push the locking column 33 when the locking column 33 moves to the front end of the slide groove 11, so that the guide column 32 on the matching end 302 slides from the second end 223 of the guide groove 22 to the bending portion 222, and the rear end wall 112 of the slide groove 11 is used to push the locking column 33 when the locking column 33 moves to the rear end of the slide groove 11, so that the guide column 32 on the matching end 302 slides from the bending portion 222 of the guide groove 22 to the second end 223. The spring 40 is installed on the second connecting seat 20, and is used to provide an elastic stress for pushing the locking member 30. The elastic stress applied by the spring 40 to the locking member 30 makes the locking column 33 on the locking member 30 always maintain a movement trend toward the slide slot 11. In this way, when the locking column 33 is located in the slide slot 11 and is directly opposite to the slot 115 along the Y direction, the elastic stress of the spring 40 will push the locking column 33, so that the locking column 33 is locked in the slot 115. When the locking column 33 is placed in the slot 115, the elastic stress of the spring 40 pushes the locking column 33, so that the locking column 33 is kept in the slot 115. ;

[0033] Figure 6a , 6b 6c is a schematic diagram of the state in which the locking member 30 and the second connecting seat 20 cooperate with each other in the utility model. For ease of understanding, Figure 6a , 6b6c shows a top-down perspective after omitting the first connection base 10. Figure 6a In the state shown, the guide post 32 of the locking member 30 is located at the first end 221 of the guide groove 22 by the elastic stress of the spring 40. At this time, the locking post 33 is locked in the locking groove 115; see Figure 6b When the first connection seat 10 is moved forward relative to the second connection seat 20, the first connection seat 10 is moved forward relative to the locking column 33 on the locking member 30, and the inner wall of the locking groove 115 pushes the locking column 33 toward the direction close to the first side wall 113, so that the locking column 33 is disengaged from the locking groove 115. During this process, the guide column 32 slides from the first end 221 of the guide groove 22 to the bending portion 222; Figure 6a In the state shown in FIG. 1 , if the locking post 33 is located in the rearmost locking slot 115, then Figure 6b The state shown is that the first connecting seat 10 is moved forward to a position close to the limit relative to the second connecting seat 20, and the inner wall of the rearmost slot 115 is used to push the locking column 33 out of the rearmost slot 115, so that the locking column 33 is located at the rearmost end of the slide slot 11. Figure 6c As shown, the first connecting seat 10 continues to move forward relative to the second connecting seat 20, the rear end wall 112 of the slide groove 11 contacts the locking column 33 and pulls the locking column 33 forward, thereby driving the locking member 30 to move forward relative to the second connecting seat 20, and the protruding column 21 on the second connecting seat 20 slides from the front end portion of the through groove 31 of the locking member 30 to the rear end portion, and the guide column 32 slides from the bent portion 222 of the guide groove 22 to the second end 223. At this time, since the portion of the guide groove 22 located between the bent portion 222 and the second end 223 limits the freedom of the guide column 32 to move left and right, the elastic stress of the spring 40 cannot cause the locking column 33 of the locking member 30 to move toward the direction close to the slot 115. Figure 6c In the state shown, the freedom of the first connecting seat 10 to move backward relative to the second connecting seat 20 will no longer be restricted by the locking member 30, and the first connecting seat 10 can be moved backward to the extreme position. When the first connecting seat 10 is moved backward to the extreme position, the front end wall 111 of the slide groove 11 pushes the locking column 33 backward, so that the locking member 30 moves backward relative to the second connecting seat 20, and the protruding column 21 slides to the front end portion of the through groove 31. At the same time, the guide column 32 slides from the second end 223 of the guide groove 22 to the bending portion 222. When the guide column 32 is at the bending portion 222, the elastic stress of the spring 40 can push the mating end 302 of the locking member 30 to swing, so that the guide column 32 automatically slides from the bending portion 222 to the first end 221, and the locking column 33 is snapped into the slot 115 as the locking member 30 swings.

[0034] Combined with the above Figure 6a , 6b, 6c, the following is based on Figure 7a , 7b , 7c, 7d, and 7e show different states to introduce the working process of the utility model in more detail. Figure 7a , 7b , 7c, 7d, 7e show the state where the first connection seat 10, the second connection seat 20 and the locking member 30 cooperate with each other. For ease of understanding, Figure 7a , 7b , 7c, 7d, and 7e show the bottom-up perspective. Figure 7a In the state shown, the first connecting seat 10 and the second connecting seat 20 are in a state of being locked by the locking member 30, the locking column 33 is locked in the locking groove 115 located in the middle position of the length direction of the slide groove 11, and the elastic effect of the spring 40 and the inner wall structure of the locking groove 115 make it difficult for the locking column 33 to be separated from the locking groove 115 when it is locked in the locking groove 115, especially when the user's head is against the headrest 50, it applies a backward thrust to the headrest 50, because the locking column 33 is locked in the slot 115 The locking column 33 is used to limit the freedom of the first connection seat 10 to move backward relative to the locking member 30. At the same time, the guide column 32 is located in the first end 221 of the guide groove 22, and the protruding column 21 is located at the front end of the through groove 31, which limits the freedom of the locking member 30 to move backward relative to the second connection seat 20. The locking member 30 is used to lock the freedom of the first connection seat 10 to move backward relative to the second connection seat 20, that is, when the user uses the seat normally, the pressure exerted by his head on the headrest 50 will not cause the headrest 50 to move backward abnormally. Figure 7a In the state shown, when the headrest 50 needs to be adjusted forward, the headrest 50 is directly pulled forward, and the first connecting seat 10 moves forward. During the forward movement of the first connecting seat 10, the inner wall of the slot 115 pushes the locking column 33 toward the first side wall 113 of the slide slot 11, so that the locking column 33 is disengaged from the slot 115. When the first connecting seat 10 is moved forward to the required position, the elastic stress of the spring 40 causes the mating end of the locking member 30 to swing, and the locking column 33 will fall into the slot 115 at the corresponding position. Figure 7a In the state shown, if the headrest 50 is located relatively forward and needs to be adjusted backward, Figure 7a In the state shown, the headrest 50 is pulled forward to move the first connecting seat 10 to the position shown in FIG. Figure 7b In the state shown in FIG. 1 , the locking column 33 moves in the rearmost locking groove 115 to a position close to the rear end wall 112 of the slide groove 11, and the headrest 50 continues to be pulled forward, and the rear end wall 112 pushes the locking column 33, so that the locking column 33 moves forward with the first connecting seat 10 relative to the second connecting seat 20 to Figure 7cIn the state shown in FIG. 1 , the locking post 33 is in a state of being disengaged from the locking slot 115, and see the above Figure 6c As shown, the guide column 32 is located in the second end 223 of the guide groove 22. At this time, the freedom of the guide column 32 to swing left and right is limited, that is, the freedom of the matching end 302 of the locking member 30 to swing left and right is limited, and the elastic stress of the spring 40 cannot make the matching end 302 swing toward the second side wall 114 of the slide groove 11. In this state, the headrest 50 can be pushed backward. Since the swing of the locking column 33 is limited, the freedom of the first connecting seat 10 to move backward will no longer be blocked by the locking member 30, so that the first connecting seat 10 can move backward to the position as shown in FIG. Figure 7d In the state shown, in this state, the locking column 33 is close to the front end wall 111 of the slide groove 11. When the first connecting seat 10 is continuously pushed backward, the front end wall 111 pushes the locking column 33 to move the locking column 33 backward relative to the second connecting seat 20. When the guide column 32 moves backward relative to the second connecting seat 20 along with the locking member 30, the guide column 32 moves from the second end 223 of the guide groove 22 to the bent portion 222, that is, Figure 7e In the state shown, at this time, the elastic stress of the spring 40 can push the mating end 302 of the locking member 30 toward the second side wall 114. Under the action of the elastic stress of the spring 40, the mating end 302 of the locking member 30 swings, and then the locking column 33 falls into the frontmost slot 115. The locking member 30 will again lock the freedom of the first connecting seat 10 to move backward relative to the second connecting seat 20. At this time, the headrest 50 is located at the rearmost position. When the headrest 50 needs to be adjusted forward, it only needs to be pulled forward the required distance.

[0035] It should be pointed out that the above-mentioned spring 40 of the utility model can also be replaced by other elastic parts. For example, the elastic part can be an elastic rubber block, a retaining spring, a gas spring, etc. In short, the elastic part only needs to be able to provide an elastic stress to push the locking member 30 so that the locking column 33 on the locking member 30 can always maintain a movement trend toward the second side wall 114 of the slide groove 11.

[0036] In the front-to-back adjustment mechanism of the seat headrest of the present invention, a locking member 30 is arranged between the first connecting seat 10 and the second connecting seat 20, and the locking member 30 is configured to be able to swing left and right and move forward and backward relative to the second connecting seat 20, so that the locking member 30 can be stably placed between the first connecting seat 10 and the second connecting seat 20 when the first connecting seat 10 is subjected to a backward extrusion force, thereby preventing the first connecting seat 10 from moving backward relative to the second connecting seat 20. When the user uses the seat normally, the pressure exerted by the user's head on the headrest 50 will not cause the headrest 50 to move backward abnormally, so that the headrest 50 can provide better support for the user's head; when it is necessary to adjust the front-to-back position of the headrest 50, the headrest 50 is pulled forward to the extreme position After the locking piece 30 swings, it no longer locks the freedom of the first connecting seat 10 to move backward relative to the second connecting seat 20. Then, the headrest 50 is pushed backward to the extreme position, so that the locking piece 30 returns to the state where it can lock the second connecting seat 20 and the first connecting seat 10. The headrest 50 is pulled forward to the predetermined position according to the predetermined position, so that the locking piece 30 is automatically in the locked state to prevent the first connecting seat 10 from moving backward relative to the second connecting seat 20. During the entire adjustment process, the locking piece 30 and the second connecting seat 20 will not produce a large resistance to the movement of the first connecting seat 10. The headrest 50 can be adjusted into place using a small thrust and pull force. The entire adjustment process of the headrest 50 is relatively quick and labor-saving.

[0037] In the present invention, a through groove 31 extending along the length direction of the locking member 30 is provided on the connecting end 301 of the locking member 30, and a boss 21 inserted into the through groove 31 is provided on the second connecting seat 20, and the boss 21 is set to be cylindrical, so that the connecting end 301 of the locking member 30 is configured to be able to rotate relative to the second connecting seat 20 and move relative to the second connecting seat 20 along the X direction; as another embodiment, the boss 21 may be provided on the connecting end 301 of the locking member 30, and the through groove 31 is used as a matching portion that matches with the boss 21 and is provided on the second connecting seat 20; in other embodiments of the present invention, other matching portions may be provided on the second connecting seat 20, and the connecting end 301 of the locking member 30 is connected to the matching portion, and the matching portion and the connecting end 301 of the locking member 30 cooperate with each other and are configured to enable the locking member 30 to swing left and right relative to the second connecting seat 20 and move forward and backward along the X direction relative to the second connecting seat 20. In the utility model, the second connecting seat 20 is arranged below the first connecting seat 10, and an upper surface 201 is arranged on the second connecting seat 20, and a lower surface 101 is arranged on the first connecting seat 10, wherein the upper surface 201 is located below the lower surface 101, and the slide groove 11 is formed by the lower surface 101 being recessed upward, and a downwardly recessed groove 202 is arranged on the upper surface 201 of the second connecting seat 20, and the locking member 30 is embedded in the groove 202, and the above-mentioned convex column 21 extends upward from the bottom surface of the groove 202. After the locking member 30 is embedded in the groove 202, the locking column 33 extends upward and protrudes from the upper surface 201 of the second connecting seat 20, so that the locking column 33 can penetrate into the slide groove 11. By setting the above-mentioned groove 202, the locking member 30 is embedded in the groove 202, and the groove 202 is used to provide an installation space for the locking member 30 so that the locking member 30 is placed between the first connecting seat 10 and the second connecting seat 20, and the space occupied by the locking member 30 in the height direction is reduced as much as possible, thereby making the entire adjustment mechanism structure more compact. The spring 40 is also arranged in the above-mentioned groove 202. In order to prevent the spring 40 from being separated from the mating end 302 of the locking member 30, a mounting post 34 is protruding on one side of the mating end 302 of the locking member 30. One end of the spring 40 is sleeved on the mounting post 34 and the other end is pressed against the inner wall of the groove 202. Since the locking member 30 may be separated from the mating end 302 of the locking member 30 when it moves back and forth relative to the second connecting seat 20, causing the spring 40 to fail, the above-mentioned mounting post 34 can make one end of the spring 40 move back and forth with the locking member 30, thereby preventing the one end of the spring 40 from being separated from the mating end 302 of the locking member 30.In a preferred embodiment, the mating end 302 of the locking member 30 is configured to have a cylindrical structure, and an arc-shaped locking groove 203 is provided on the inner wall of the groove 202. When the locking column 33 is locked in the locking groove 115, the side of the mating end 302 facing away from the mounting column 34 is embedded in the locking groove 203. The freedom of movement of the mating end 302 in the forward and backward directions is limited by the locking groove 203. When the locking member 30 is in the state of locking the freedom of the first connecting seat 10 to move backward relative to the second connecting seat 20, the locking groove 203 cooperates with the mating end 302 to prevent the locking member 30 from moving forward and backward relative to the second connecting seat 20, so that the locking member 30 can limit the freedom of movement of the first connecting seat 10 backward relative to the second connecting seat 20 more stably.

[0038] In another embodiment, the guide groove 22 may be arranged on the bottom surface of the above-mentioned groove 202, and the guide column 32 may be arranged on the lower surface of the mating end 302 and extend downward to be embedded in the guide groove 22; in some embodiments, the guide groove 22 may be arranged on the mating end 302 of the locking member 30, and the guide column 32 may be correspondingly arranged on the second connecting seat 20; in other embodiments, other guide members may be arranged on the second connecting seat 20, and other structures cooperating with the guide members may be correspondingly arranged on the mating end 302 of the locking member 30, so that the mating end 302 of the locking member 30 can move along the extension direction of the guide member, and then, when the locking member 30 swings left and right relative to the second connecting seat 20, the mating end 302 of the locking member 30 can slide between the first end and the bending portion of the guide member, and when the locking member 30 moves back and forth relative to the second connecting seat 20, the mating end of the locking member 30 can slide between the second end and the bending portion of the guide member.

[0039] The inner wall shape of the above-mentioned slot 115 of the utility model is configured to be able to clamp the locking column 33 when the first connecting seat 10 is pushed backward, and to push the locking column 33 toward the first side wall 113 of the slide groove 11 when the first connecting seat 10 moves forward so that the locking column 33 is disengaged from the slot 115. For details, see Figure 3As shown, the inner wall of the slot 115 includes an arcuate inner wall 1151 and an oblique guide wall 1152. The arcuate inner wall 1151 extends from the second side wall 114 in a direction away from the first side wall 113. The middle part of the arcuate inner wall 1151 is recessed forward. The oblique guide wall 1152 extends obliquely from one end of the arcuate inner wall 1151 away from the first side wall 113 to the second side wall 114. In this way, the arcuate inner wall 1151 and the oblique guide wall 1152 are used to form a structure similar to an inverted hook on the second side wall 114 of the slot 115. When the locking column 33 is placed in the slot 115, the locking column 33 falls into the recessed portion formed by the arcuate inner wall 1151, so that the arcuate inner wall 1151 half wraps the locking column 33. When the first connecting seat 10 is pushed backward, the locking column 33 will only fit more tightly in the locking groove 115. On the contrary, when the first connecting seat 10 is pulled forward, the locking column 33 slides along the inclined guide wall 1152, and the inclined guide wall 1152 pushes the locking column 33 toward the first side wall 113, and finally causes the locking column 33 to disengage from the locking groove 115; it should be noted that the inclined guide wall 1152 of the locking groove 115 on the rear side is connected to the rear end wall 112 of the slide groove 11. When the locking column 33 is located in the locking groove 115 on the rear side and the first connecting seat 10 is pulled forward, the inclined guide wall 1152 of the locking groove 115 on the rear side can push the locking column 33 directly to the rear end wall 112 of the slide groove 11.

[0040] It should be pointed out that the vertical installation relationship between the second connecting seat 20 and the first connecting seat 10 of the utility model is not limited to the above structure. The second connecting seat 20 can be arranged above the first connecting seat 10 so that the two can slide relative to each other, or the first connecting seat 10 and the second connecting seat 20 are matched in a mutually sleeved manner. Regardless of the matching relationship, it is necessary to prevent the first connecting seat 10 and the second connecting seat 20 from being separated from each other in the height direction to ensure the normal use of the headrest 50. For example, in a preferred embodiment, Figure 1As shown, a limiting seat 23 is respectively provided on both sides of the second connecting seat 20, and the two limiting seats 23 are fixed on the second connecting seat 20 in a detachable manner. The two limiting seats 23 are respectively located on the left and right sides of the second connecting seat 20, and a mounting groove is formed between the second connecting seat 20 respectively. The openings of the two mounting grooves are arranged relatively to each other, and the two side edges of the first connecting seat 10 are respectively slidably embedded in the two mounting grooves. During assembly, the locking member 30 is pre-placed on the upper surface 201 of the second connecting seat 20, and the first connecting seat 10 is placed on the second connecting seat 20 so that the locking member 30 is located between the first connecting seat 10 and the second connecting seat 20. Then, the limiting seats 23 are respectively placed on both sides above the first connecting seat 10, and the screw holes on the limiting seats 23 and the second connecting seat 20 are aligned. The limiting seats 23 and the second connecting seat 20 are penetrated by screws, and the two limiting seats 23 respectively form a mounting groove with the second connecting seat 20. After tightening the screws, the two sides of the first connecting seat 10 are respectively clamped in the two mounting grooves.

[0041] In order to prevent the second connecting seat 20 and the first connecting seat 10 from being worn after a long period of relative movement, a plurality of wear-resistant strips 24 are fixed on the upper surface 201 of the second connecting seat 20, and the wear-resistant strips 24 are detachably fixed to the upper surface 201 of the second connecting seat 20. Specifically, the two ends of the wear-resistant strips 24 can be clamped in the mounting grooves provided on the second connecting seat 20 so that the wear-resistant strips 24 can be detachably fixed to the upper surface 201 of the second connecting seat 20, and the length direction of the wear-resistant strips 24 is consistent with the X direction, and the wear-resistant strips 24 are arranged in a wavy shape. The wear-resistant strips 24 are pressed on the lower surface 101 of the first connecting seat 10, which can To avoid direct contact between the lower surface 101 of the first connecting seat 10 and the upper surface 201 of the second connecting seat 20, the wear-resistant strip 24 is configured to be wavy to reduce the contact area with the lower surface 101 of the first connecting seat 10, reduce the friction resistance between the first connecting seat 10 and the second connecting seat 20, and the wear-resistant strip 24 is detachably fixed to the second connecting seat 20. When the wear-resistant strip 24 is worn after a long period of use, it is convenient to replace it with a new wear-resistant strip 24, so as to always ensure that a smaller gap is formed between the first connecting seat 10 and the second connecting seat 20, thereby achieving the purpose of preventing the first connecting seat 10 and the second connecting seat 20 from wearing.

[0042] The seat of the present invention includes a headrest 50, a backrest and the fore-and-aft adjustment mechanism of the seat headrest. The headrest 50 is connected to the first connecting seat 10, and the 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.

[0043] 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 mechanism of the seat headrest is characterized by: It comprises a first connecting seat, a second connecting seat, a locking member and an elastic member, wherein the first connecting seat and the second connecting seat are slidably matched so that the two have the freedom of relative movement in the front-rear direction; The second connecting seat is provided with a matching portion and a guide member, the guide member includes a first end, a second end, and a bending portion located between the first end and the second end, wherein the first end and the bending portion are staggered with each other in the left-right direction, and the second end is located at the front side of the bending portion; The locking member includes a connecting end and a matching end opposite to the connecting end, the connecting end is connected to the matching portion so that the locking member can swing left and right relative to the second connecting seat and move forward and backward relative to the second connecting seat, and the matching end is slidably matched with the guide member so that the locking member slides between the first end and the bent portion when the locking member swings left and right relative to the second connecting seat, and slides between the second end and the bent portion when the locking member moves forward and backward relative to the second connecting seat; a locking column is provided on the matching end of the locking member; The first connecting seat is provided with a slide groove extending in the front-to-back direction for the locking column to be embedded in the slide groove, which includes a front end wall, a rear end wall opposite to the front end wall, a first side wall located between one side of the front end wall and the rear end wall, and a second side wall located between the front end wall and the other side of the rear end wall. The second side wall is provided with a plurality of locking grooves arranged in the front-to-back direction for the locking column to be embedded in the locking groove. The shape of the locking groove is configured to prevent the locking column embedded in the locking groove from being disengaged from the locking groove when the first connecting seat moves backward relative to the locking column, and to enable the locking column to be ejected from the locking groove when the first connecting seat moves forward relative to the locking column; the front end wall of the slide groove is used to push the locking column when the locking column moves to the front end of the slide groove so that the matching end slides from the second end of the guide member to the bent portion, and the rear end wall of the slide groove is used to push the locking column when the locking column moves to the rear end of the slide groove so that the matching end moves from the bent portion of the guide member to the second end; The elastic member is used to apply elastic stress to the locking member so that the locking column always maintains a movement trend of approaching the second side wall of the sliding groove.

2. The front-rear adjustment mechanism of the seat headrest according to claim 1, characterized in that: A through groove extending along the length direction of the locking piece is provided on the connecting end of the locking piece. The matching part is a convex column arranged on the second connecting seat and inserted into the through groove. The convex column is cylindrical so that the convex column can slide in the sliding groove and the connecting end of the locking piece can rotate relative to the convex column.

3. The front-rear adjustment mechanism of the seat headrest according to claim 2, characterized in that: The second connecting seat includes an upper surface, and the first connecting seat includes a lower surface located on the upper surface; the upper surface of the second connecting seat is provided with a downwardly concave groove, the locking piece is embedded in the groove, and the protruding column extends upward from the bottom surface of the groove; the sliding groove is formed by the upward concave lower surface of the first connecting seat, and the locking column protrudes from the upper surface of the second connecting seat to be inserted into the sliding groove.

4. The front-rear adjustment mechanism of the seat headrest according to claim 3, characterized in that: The elastic member is a spring, and a mounting column is protruding from one side of the matching end of the locking member. One end of the spring is sleeved on the mounting column, and the other end abuts against the inner wall of the groove.

5. The front-rear adjustment mechanism of the seat headrest according to claim 4, characterized in that: The matching end of the locking piece is cylindrical, and an arc-shaped clamping groove is arranged on the inner wall of the groove; when the clamping column is clamped in the clamping groove, the side of the matching end facing away from the installation column is embedded in the clamping groove.

6. The front-rear adjustment mechanism of the seat headrest according to claim 1, characterized in that: The second connecting seat includes an upper surface, and the first connecting seat includes a lower surface located on the upper surface; the upper surface of the second connecting seat is provided with a downwardly concave groove, and the locking member is embedded in the groove; the guide member is a guide groove arranged on the bottom surface of the groove, and a guide column slidably embedded in the guide groove is provided on the mating end of the locking member, and the guide column slides between the first end of the guide groove and the bending portion when the locking member swings left and right relative to the second connecting seat, and slides between the second end of the guide groove and the bending portion when the locking member moves forward and backward relative to the second connecting seat.

7. The front-rear adjustment mechanism of the seat headrest according to claim 1, characterized in that: The inner wall of the slot includes an arc-shaped inner wall extending from the second side wall in a direction away from the first side wall and with a middle portion recessed forward, and an inclined guide wall extending obliquely from one end of the arc-shaped inner wall away from the first side wall to the second side wall. The recessed portion formed by the arc-shaped inner wall is used for the locking column to be embedded. The inclined guide wall is used to push the locking column toward the first side wall when the first connecting seat moves forward relative to the locking column so that the locking column disengages from the slot. The inclined guide wall of the slot located on the rearmost side is connected to the rear end wall of the slide slot.

8. The front-rear adjustment mechanism of the seat headrest according to claim 1, characterized in that: A limit seat is respectively arranged on both sides of the second connecting seat, and the two limit seats are fixed on the second connecting seat in a detachable manner. An installation groove is respectively formed between the two limit seats and the second connecting seat, and the openings of the two installation grooves are arranged opposite to each other. The two side edges of the first connecting seat are respectively slidably embedded in the two installation grooves.

9. The front-rear adjustment mechanism of the seat headrest according to claim 1, characterized in that: The second connecting seat includes an upper surface, and the first connecting seat includes a lower surface located on the upper surface; the upper surface of the second connecting seat is detachably provided with a plurality of wear-resistant strips pressed on the lower surface of the first connecting seat, the length direction of the wear-resistant strips is consistent with the front-to-back direction, and the wear-resistant strips are wavy.

10. A seat, characterized in that: The invention comprises a headrest, a backrest, and a front-rear adjustment mechanism of the seat headrest as claimed in any one of claims 1 to 9, wherein the headrest is connected to a first connecting seat, and the backrest is connected to a second connecting seat.

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