Up-down adjusting mechanism and seat

Abstract

The utility model discloses an up-and-down adjusting mechanism and a seat. The up-and-down adjusting mechanism comprises a fixed seat, a lifting seat, a connecting seat and a locking piece, a matching part, a pushing part, a first shifting part and a second shifting part are arranged on the fixed seat, and the matching part comprises a plurality of clamping grooves; the lifting seat is mounted on the fixed seat; a guide groove is formed in the lifting seat and comprises a first section, a second section and a bent part; a sliding block, a clamping boss and a shifting rod are arranged on the locking piece; an elastic piece is arranged between the locking piece and the lifting seat; when the sliding block is located at the second section of the guide groove, the clamping boss on the locking piece is clamped in one clamping groove, and when the sliding block is located at the first section of the guide groove, the clamping boss on the locking piece is separated from the matching part; the connecting base is installed on the lifting base, and an elastic component is arranged between the connecting base and the lifting base. The lifting base is prevented from moving abnormally when bearing large external force, and when the height needs to be adjusted, the adjusting process is simple and convenient.

Description

Technical Field

[0001] This utility model relates to the field of seating technology, specifically to a height adjustment mechanism and a seat. Background Technology

[0002] Traditional chairs provide support through seat cushions and backrests, with the backrest fixed relative to the seat cushion. They lack auxiliary support units such as lumbar and headrests, leaving the user's lower back and neck unsupported, easily leading to fatigue. Some existing office and study chairs typically include lumbar and headrests to support the user's lower back and neck. To accommodate different user shapes and sitting postures, these support units are usually adjustable, for example, adjustable vertically relative to the backrest support. After adjustment, a locking mechanism is used to lock the support unit in place. However, existing locking mechanisms are prone to detachment and fail to provide stable support under pressure from the user's body. Furthermore, the adjustment process requires both hands, making it cumbersome. Utility Model Content

[0003] The purpose of this utility model is to provide a height adjustment mechanism and a seat that is simple and convenient to operate and can provide stable support.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The up-and-down adjustment mechanism includes a fixed base, a lifting base, a connecting base, and a locking component;

[0006] The fixed base is provided with a mating part, a pushing part located above the mating part, a first actuating part, and a second actuating part. The mating part includes multiple locking slots arranged vertically.

[0007] The lifting seat is mounted on the fixed seat so that the lifting seat can move relative to the fixed seat in the vertical direction; the lifting seat is provided with a guide groove, which includes a first section extending in the vertical direction and a second section extending from the top of the first section in the left-right direction toward the mating part, and the connection between the first section and the second section forms a bend; the locking member is provided with a slider, a locking boss and a lever that are slidably embedded in the guide groove; an elastic member is provided between the locking member and the lifting seat, which is used to provide an elastic stress that pushes the locking member toward the mating part in the left-right direction;

[0008] When the slider is in the second section of the guide groove, the locking boss on the locking member is engaged in one of the locking grooves. When the slider is in the first section of the guide groove, the locking boss on the locking member is disengaged from the mating part.

[0009] The pushing part on the fixed base is used to push the locking member away from the mating part in the left and right direction when the locking member slides upward with the lifting base to the top of the mating part, so that the slider slides along the second section to the bending part. The first actuating part is used to move the lever on the upward-moving locking member downward when the slider is at the bending part, so that the slider slides down from the bending part along the first section. The second actuating part is used to move the lever of the locking member upward when the locking member slides down with the lifting base to the bottom of the mating part, so that the slider slides along the first section to the bending part.

[0010] The connecting seat is installed on the lifting seat so that the connecting seat can move relative to the lifting seat in the vertical direction. An elastic component is provided between the connecting seat and the lifting seat, and the elastic component is used to apply an upward elastic stress to the connecting seat.

[0011] Preferably, the fixed base is provided with a vertically extending slide groove, and the lifting base is slidably embedded in the slide groove. The slide groove includes a first side wall and a second side wall. The mating part is provided on the first side wall. The locking groove is recessed from the first side wall in a direction away from the second side wall. The locking groove includes a baffle extending from the first side wall in a direction away from the second side wall and an inclined guide wall extending obliquely from the end of the baffle away from the second side wall to the first side wall. The baffle is used to support the locking boss located in the locking groove. The inclined guide wall is used to push the locking boss when the locking member moves upward with the lifting base, so that the slider of the locking member moves along the second section of the guide groove toward the bending part. The part of the first side wall above the uppermost locking groove forms a pushing part.

[0012] Preferably, the second sidewall is provided with a relief groove that is recessed away from the first sidewall. The top surface of the relief groove forms a first actuating part and the bottom surface forms a second actuating part. The locking boss is located on the side of the locking member closer to the first sidewall, and the lever is located on the side of the locking member closer to the second sidewall.

[0013] Preferably, the fixed seat includes a front sidewall, a sliding groove is disposed on the front sidewall of the fixed seat and extends through the front sidewall, the lifting seat is provided with a rearward protruding sliding platform, the sliding platform slides from front to back through the sliding groove, the rear end face of the sliding platform is detachably fixed with a cover plate, the front sidewall of the fixed seat is limited between the cover plate and the rear side face of the lifting seat; the rear end face of the sliding platform is provided with a recess located inside the cover plate, a locking member and an elastic member are installed in the recess, and a guide groove is disposed on the bottom surface of the recess.

[0014] Preferably, the bottom surface of the recess is provided with a guide groove located above the guide groove and extending in the vertical direction, and the locking member is provided with a protrusion embedded in the guide groove. The cross-section of the protrusion is circular so that the protrusion is configured to slide along the guide groove and rotate relative to the guide groove.

[0015] Preferably, the elastic element is a spring, with one end of the spring abutting against the side of the locking element near the second sidewall and the other end abutting against the inner wall surface of the recess.

[0016] Preferably, a spring is provided on the fixed base, the upper end of the spring is connected to the fixed base, and the lower end extends downward to the top of the slide groove so as to abut against the upper part of the slide when the slide moves upward to the top of the slide groove.

[0017] Preferably, the connecting seat is provided with a vertically extending guide groove, and a baffle is detachably fixed on the front side of the lifting seat. The front side of the lifting seat passes through the guide groove from back to front, and the baffle is placed on the front side of the connecting seat to place the connecting seat between the lifting seat and the baffle. The elastic component is a tension spring, with the upper end of the tension spring connected to the lifting seat and the lower end connected to the connecting seat.

[0018] Preferably, the rear side of the connecting seat forms a vertically extending mating plane on both sides of the guide groove, and the lifting seat is equipped with rollers that abut against the mating plane and roll on the mating plane.

[0019] The seat includes the aforementioned height adjustment mechanism.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] The height adjustment mechanism of this utility model provides support between the lifting seat and the fixed seat through the locking member, so that the downward pressure on the lifting seat can be transmitted to the fixed seat through the locking member, thereby providing stable support for the user and preventing the lifting seat from moving abnormally when subjected to large external forces. When the height needs to be adjusted, the user can operate the lifting seat with one hand to adjust the lifting seat up or down. The operation process is simple and convenient. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 for Figure 1 Schematic diagram of the middle fixed seat;

[0024] Figure 3 for Figure 1 Schematic diagram of the middle lifting seat;

[0025] Figure 4 for Figure 1 Schematic diagram of the fit between the lifting seat and the locking component;

[0026] Figure 5 for Figure 3 Schematic diagram of the slide on the middle lifting seat;

[0027] Figure 6This is a schematic diagram of one usage state of the present invention;

[0028] Figure 7-11 This is a schematic diagram of the adjustment process of the basic utility model.

[0029] Wherein: 10, fixed seat; 101, front side wall; 11, slide groove; 111, first side wall; 112, second side wall; 113, pushing part; 12, locking groove; 120, mating part; 121, baffle; 122, inclined guide wall; 13, clearance groove; 131, first actuating part; 132, second actuating part; 14, spring; 20, lifting seat; 201, slide table; 202, cover. Plate; 203, baffle; 204, recess; 21, guide groove; 211, first section; 212, second section; 213, bend; 22, guide groove; 23, roller; 30, connecting seat; 31, guide through groove; 32, mating plane; 40, locking element; 41, locking boss; 42, lever; 43, slider; 44, protruding post; 50, spring; 60, tension spring; 90, headrest. Detailed Implementation

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] like Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, this utility model provides a height adjustment mechanism for a seat, specifically for adjusting the height of the headrest 90. It includes a fixed seat 10, a lifting seat 20, a connecting seat 30, and a locking element 40. The fixed seat 10 is connected to the seat back support. The lifting seat 20 is mounted on the fixed seat 10 and can move relative to the fixed seat 10 in the vertical direction. The connecting seat 30 is mounted on the lifting seat 20 and can move relative to the lifting seat 20 in the vertical direction. A tension spring 60 is also provided between the connecting seat 30 and the lifting seat 20. The tension spring 60 applies an upward elastic stress to the connecting seat 30. The headrest 90 of the seat is mounted on the connecting seat 30.

[0034] The fixed base 10 is provided with a mating part 120, a pushing part 113 located above the mating part 120, a first actuating part 131, and a second actuating part 132, wherein the first actuating part 131 and the second actuating part 132 are located above and below the mating part 120, respectively. The mating part 120 includes a plurality of locking grooves 12 arranged in the vertical direction. The lifting base 20 is provided with a guide groove 21, which includes a first section 211 extending in the vertical direction and a second section 212 extending in the horizontal direction (i.e., left and right). The direction extends toward the locking engagement part 120, thereby forming a bend 213 at the junction of the first section 211 and the second section 212 on the guide groove 21; the locking member 40 is provided with a slider 43, a locking boss 41 and a lever 42 that are slidably embedded in the guide groove 21. The slider 43 on the locking member 40 can slide along the guide groove 21, thereby configuring the locking member 40 to be able to move relative to the lifting seat 20 in the vertical direction and to be able to move relative to the lifting seat 20 in the horizontal direction.

[0035] A spring 50 is provided between the locking member 40 and the lifting seat 20. The spring 50 applies an elastic stress to the locking member 40, which keeps the locking member 40 moving toward the mating part 120. Consequently, the locking boss 41 on the locking member 40 keeps moving toward the mating part 120. When the slider 43 is in the second section 212 of the guide groove 21, based on the elastic stress of the spring 50, the slider 43 is positioned at the end of the second section 212 away from the bend 213. At this time, in the left-right direction, the locking member 40 is located at the position closest to the mating part 120, and the locking boss 41 on the locking member 40 is engaged in one of the locking grooves 12 of the mating part 120.

[0036] When the slider 43 is placed in the first segment 211, due to the limitation of the slider 43 by the first segment 211, the locking member 40 is placed in a position away from the mating part 120 in the left and right direction. At this time, the locking boss 41 on the locking member 40 is separated from the mating part 120, that is, the locking boss 41 will not be embedded in any locking groove 12. The pushing part 113 on the fixed base 10 is used to push the locking member 40 away from the mating part 120 in the left and right direction when the locking member 40 slides upward with the lifting base 20 to the top of the mating part 120, so that the locking boss 41 on the locking member 40 disengages from the locking groove 12 at the top of the mating part 120. At this time, the slider 43 on the locking member 40 slides to the bending part 213 via the second section 212 of the guide groove 21. The first actuating part 131 on the fixed base 10 is used to push the lever 42 on the upwardly moving locking member 40 downward when the slider 43 is located at the bending part 213.

[0037] In other words, when the locking boss 41 on the locking member 40 disengages from the topmost locking groove 12, and the lifting seat 20 continues to move upward, the lifting seat 20 drives the locking member 40 to move upward relative to the first actuating part 131. This causes the first actuating part 131 to push the lever 42 on the locking member 40 downward, causing the locking member 40 to move downward. The slider 43 on the locking member 40 will slide downward along the first section 211 of the guide groove 21 from the bend 213 to the bottom of the first section 211. The slider 43 sliding into the first section 211 will limit the left and right position of the locking member 40, so that the locking member 40 is in a position away from the mating part 120 in the left and right direction.

[0038] The second actuating part 132 is used to push the lever 42 on the locking member 40 upward when the locking member 40 slides down with the lifting seat 20 to the bottom of the mating part 120, so that the slider 43 slides along the first section 211 to the bending part 213. When the slider 43 slides to the bending part 213, the first section 211 no longer restricts the left and right degrees of freedom of the slider 43. At this time, based on the elastic stress of the spring 50, the slider 43 can move along the second section 212 towards the mating part 120.

[0039] The fixed base 10 is provided with a vertically extending slide groove 11. The lifting base 20 is slidably embedded in the slide groove 11 to slidably mount the lifting base 20 on the fixed base 10. The slide groove 11 includes a first side wall 111 and a second side wall 112 opposite to the first side wall 111. The mating part 120 is provided on the first side wall 111, that is, the locking groove 12 is formed by recessing from the first side wall 111 in a direction away from the second side wall 112. The locking groove 12 includes a baffle 121 extending from the first side wall 111 in a direction away from the second side wall 112, and a baffle 121 extending away from the second side wall 111. One end of 2 extends obliquely to the inclined guide wall 122 of the first side wall 111. When the locking boss 41 of the locking member 40 is engaged in the locking groove 12, the baffle 121 is supported below the locking boss 41. The downward external force (such as the downward pressure from the user's head) on the lifting seat 20 can be transmitted to the fixed seat 10 through the locking boss 41 and the baffle 121 on the locking member 40. In this way, the locking member 40 can lock the lifting seat 20 and the fixed seat 10, limiting the degree of freedom of the lifting seat 20 to move downward relative to the fixed seat 10, thereby providing stable support for the user's head.

[0040] When the locking boss 41 is engaged in the locking groove 12, if the position of the headrest 90 needs to be adjusted upward, the lifting seat 20 can be lifted upward. Since the lifting seat 20 drives the locking member 40 to move upward relative to the inclined guide wall 122, the inclined guide wall 122 can push the locking boss 41 towards the second side wall 112, so that the slider 43 of the locking member 40 moves along the second section 212 of the guide groove 21 towards the bend 213. When the slider 43 moves to the bend 213 of the guide groove 21, the locking boss 41 of the locking member 40 just disengages from the locking groove 12. That is to say, the locking groove 12 is configured as described above, so that the locking groove 12 and the locking member 40 cooperate to form a motion mechanism, which only allows the locking member 40 to move upward relative to the fixed seat 10, and does not allow the locking member 40 to move downward relative to the fixed seat 10.

[0041] The aforementioned push part 113 is formed on the first side wall 111 at the position above the uppermost locking groove 12, lifting the lifting seat 20 upward. After the locking boss 41 on the locking member 40 disengages from the uppermost locking groove 12, the push part 113 abuts against the locking boss 41, so that the slider 43 of the locking member 40 is held at the position of the bend 213 of the guide groove 21.

[0042] The second sidewall 112 is provided with a relief groove 13 that is recessed away from the first sidewall 111. The top surface of the relief groove 13 forms a first actuating part 131 and the bottom surface forms a second actuating part 132. The locking boss 41 is located on the side of the locking member 40 near the first sidewall 111, and the lever 42 is located on the side of the locking member 40 near the second sidewall 112.

[0043] In this invention, the shape of the slider 43 can be designed so that when the slider 43 slides inside the guide groove 21, it will not rotate relative to the lifting seat 20. That is, guided by the guide groove 21, the slider 43 only has the freedom of movement relative to the lifting seat 20 in the up-down and left-right directions. However, the translational slider 43 is prone to getting stuck in the guide groove 21. Therefore, in other embodiments of this invention, the locking member 40 can be configured to swing left and right relative to the lifting seat 20. Through the left-right swinging structure, the locking protrusion 41 on the locking member 40 can move away from or closer to the mating part 120 in the left-right direction.

[0044] Specifically, a guide groove 22 is provided on the lifting seat 20, which is located above the guide groove 21 and extends in the vertical direction. A protrusion 44 is provided on the locking member 40, which is embedded in the guide groove 22. The cross-section of the protrusion 44 is set to be circular, so that the protrusion 44 can move up and down along the guide groove 22. At the same time, the protrusion 44 can rotate relative to the guide groove 22. When the protrusion 44 is located at the top of the guide groove 22, the slider 43 is located in the second section 212 of the guide groove 21. The protrusion 44 rotates in the guide groove 22, so that the slider 43 can swing left and right along the second section 212 of the guide groove 21. When the slider 43 slides into the first section 211 of the guide groove 21, the protrusion 44 is located at the bottom of the guide groove 22. In this way, the locking member 40 can swing left and right relative to the lifting seat 20. The lower end of the locking member 40 is the free end of the swing. The above-mentioned locking boss 41 and lever 42 are respectively placed on both sides of the lower end of the locking member 40.

[0045] The fixed seat 10 includes a front sidewall 101. A slide groove 11 is disposed on and passes through the front sidewall 101 of the fixed seat 10. The lifting seat 20 is provided with a rearwardly protruding slide 201. The slide 201 slides from front to back through the slide groove 11. A cover plate 202 is detachably fixed to the rear end face of the slide 201. The front sidewall 101 of the fixed seat 10 is confined between the cover plate 202 and the rear side of the lifting seat 20, thereby preventing the lifting seat 20 from moving in the front-rear direction. The lifting seat 20 is detached from the fixed seat 10, so that after being installed on the fixed seat 10, the lifting seat 20 has only the vertical direction of freedom of movement. The rear end face of the slide table 201 is provided with a recess 204 located inside the cover plate 202. The locking member 40 and the spring 50 are both located in the recess 204. The cover plate 202 is used to cover the recess 204 to prevent the locking member 40 and the spring 50 from detaching from the slide table 201. The guide groove 21 and the guide groove 22 mentioned above are both provided on the bottom surface of the recess 204.

[0046] Figure 6 This invention demonstrates one usage state of the present invention. The locking protrusion 41 is engaged in one of the locking slots 12. The locking member 40 locks the lifting seat 20 and the fixed seat 10, so that the headrest 90 can provide stable support for the user's head. When the headrest 90 needs to be adjusted upward, the lifting seat 20 can be lifted upward directly, so that the locking protrusion 41 on the locking member 40 can be engaged in the corresponding locking slot 12.

[0047] exist Figure 6 In the indicated position, if the headrest 90 is too high and needs to be adjusted downwards, such as... Figure 7 As shown, the lifting seat 20 is lifted upwards, causing the locking boss 41 to disengage from the topmost locking groove 12. The locking boss 41 is held in place by the pushing part 113, preventing the locking member 40 from swinging towards the mating part 120. Then, as... Figure 8 As shown, the lifting seat 20 is lifted upwards, the lever 42 contacts the first actuating part 131 and is pushed downwards by the first actuating part 131, so that the locking member 40 moves downwards relative to the lifting seat 20, and the slider 43 slides from the bent part 213 of the guide groove 21 into the first section 211.

[0048] At this time, the locking member 40 is limited by the first section 211 of the guide groove 21 and will not swing toward the mating part 120; Figure 9 As shown, when the lifting seat 20 is moved downward, since the locking member 40 is located away from the mating part 120, the baffle 121 on the locking groove 12 will not restrict the degree of freedom of the locking member 40 to move downward. The lever 42 moves downward in the clearance groove 13 along with the locking member 40 until the lever 42 contacts the second actuating part 132.

[0049] like Figure 10As shown, the lifting seat 20 continues to move downwards, and the second actuating part 132 moves the lever 42 upwards, causing the locking member 40 to move upwards relative to the lifting seat 20. The slider 43 moves upwards along the first section 211 of the guide groove 21 to the bend 213, as shown. Figure 11 As shown, under the push of the spring 50, the slider 43 swings away from the bend 213 along the second section 212 of the guide groove 21, causing the locking member 40 to swing toward the mating part 120. Finally, the locking boss 41 is engaged in the bottom locking groove 12. Finally, according to the required height, the lifting seat 20 is pulled upward until the locking boss 41 is engaged in the corresponding locking groove 12, thus completing the downward adjustment of the headrest 90.

[0050] The height adjustment mechanism of this utility model provides support between the lifting seat 20 and the fixed seat 10 through the locking member 40, so that the downward pressure on the lifting seat 20 can be transmitted to the fixed seat 10 through the locking member 40, thereby providing stable support for the user and preventing the lifting seat 20 from moving abnormally when subjected to large external forces. When the height needs to be adjusted, the user can operate the lifting seat 20 with one hand to adjust the lifting seat 20 up or down. The operation process is simple and convenient.

[0051] A spring plate 14 is also provided on the fixed base 10. The upper end of the spring plate 14 is connected to the fixed base 10, and the lower end extends downward to the top of the slide groove 11. When the slide table 201 slides upward to the top of the slide groove 11, the lower end of the spring plate 14 contacts the slide table 201 and buffers the slide table 201. In this way, rigid impact between the lifting seat 20 and the fixed base 10 can be avoided during the adjustment process. It can also serve as a reminder to the user. When the lifting seat 20 is lifted upward, the spring plate 14 dampens the lifting seat 20, indicating that the lifting seat 20 has reached its limit position.

[0052] A vertically extending guide groove 31 is provided on the connecting seat 30. A baffle 203 is detachably fixed to the front side of the lifting seat 20. The front side of the lifting seat 20 passes through the guide groove 31 from back to front, allowing the connecting seat 30 to move vertically relative to the lifting seat 20 in the extending direction of the guide groove 31. The baffle 203 is placed on the front side of the connecting seat 30, so that the connecting seat 30 is placed between the baffle 203 and the lifting seat 20, thereby preventing the connecting seat 30 from detaching from the lifting seat 20 in the front-back direction. The upper end of the tension spring 60 is connected to the lifting seat 20, and the lower end is connected to the connecting seat 30. The tension spring 60 provides an upward elastic stress to the connecting seat 30, which enables the headrest 90 to adapt to the user's head position. It should be noted that the tension spring 60 can be replaced by other elastic components, such as a spring or an elastic rubber block disposed between the lifting seat 20 and the connecting seat 30; similarly, the spring 50 installed between the locking member 40 and the lifting seat 20 can also be replaced by other types of elastic components such as an elastic rubber block.

[0053] The rear side of the connecting seat 30, located on both sides of the guide groove 31, forms a vertically extending mating plane 32. A roller 23 is installed on the lifting seat 20. The roller 23 abuts against the mating plane 32 and can roll on the mating plane 32. Through the cooperation between the roller 23 and the mating plane 32, the friction between the connecting seat 30 and the lifting seat 20 is reduced, the wear of the connecting seat 30 and the lifting seat 20 is reduced, and the connecting seat 30 can better adapt to the downward pressure of the user's head.

[0054] The above example only illustrates the up-and-down adjustment mechanism of this utility model using the headrest 90 of the seat. The up-and-down adjustment mechanism of this utility model is also applicable to the up-and-down adjustment of the lumbar support and backrest of the seat.

[0055] The seat of this utility model includes the above-mentioned height adjustment mechanism. The other structures of the seat are the same as those in the prior art and will not be described in detail here.

[0056] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A height adjustment mechanism, characterized in that, Includes a fixed base, a lifting base, a connecting base, and a locking component; The fixed base is provided with a mating part, a pushing part located above the mating part, a first actuating part, and a second actuating part. The mating part includes multiple locking slots arranged vertically. The lifting seat is mounted on the fixed seat so that the lifting seat can move relative to the fixed seat in the vertical direction; the lifting seat is provided with a guide groove, which includes a first section extending in the vertical direction and a second section extending from the top of the first section in the left-right direction toward the mating part, and the connection between the first section and the second section forms a bend; the locking member is provided with a slider, a locking boss and a lever that are slidably embedded in the guide groove; an elastic member is provided between the locking member and the lifting seat, which is used to provide an elastic stress that pushes the locking member toward the mating part in the left-right direction; When the slider is in the second section of the guide groove, the locking boss on the locking member is engaged in one of the locking grooves. When the slider is in the first section of the guide groove, the locking boss on the locking member is disengaged from the mating part. The pushing part on the fixed base is used to push the locking member away from the mating part in the left and right direction when the locking member slides upward with the lifting base to the top of the mating part, so that the slider slides along the second section to the bending part. The first actuating part is used to move the lever on the upward-moving locking member downward when the slider is at the bending part, so that the slider slides down from the bending part along the first section. The second actuating part is used to move the lever of the locking member upward when the locking member slides down with the lifting base to the bottom of the mating part, so that the slider slides along the first section to the bending part. The connecting seat is installed on the lifting seat so that the connecting seat can move relative to the lifting seat in the vertical direction. An elastic component is provided between the connecting seat and the lifting seat, and the elastic component is used to apply an upward elastic stress to the connecting seat.

2. The up-and-down adjustment mechanism as described in claim 1, characterized in that, The fixed base is provided with vertically extending slide grooves, and the lifting base is slidably embedded in the slide grooves. The slide grooves include a first side wall and a second side wall. The mating part is provided on the first side wall. The locking groove is recessed from the first side wall in a direction away from the second side wall. The locking groove includes a baffle extending from the first side wall in a direction away from the second side wall and an inclined guide wall extending obliquely from the end of the baffle away from the second side wall to the first side wall. The baffle is used to support the locking boss located in the locking groove. The inclined guide wall is used to push the locking boss when the locking member moves upward with the lifting base, so that the slider of the locking member moves along the second section of the guide groove toward the bending part. The part of the first side wall above the uppermost locking groove forms a pushing part.

3. The up-and-down adjustment mechanism as described in claim 2, characterized in that, The second sidewall is provided with a relief groove that is recessed away from the first sidewall. The top surface of the relief groove forms a first actuating part and the bottom surface forms a second actuating part. The locking boss is located on the side of the locking member closer to the first sidewall, and the lever is located on the side of the locking member closer to the second sidewall.

4. The up-and-down adjustment mechanism as described in claim 2, characterized in that, The fixed seat includes a front sidewall, a slide groove is provided on the front sidewall of the fixed seat and extends through the front sidewall, and a rearward protruding slide is provided on the lifting seat. The slide slide slides from front to back through the slide groove. A cover plate is detachably fixed to the rear end face of the slide plate. The front sidewall of the fixed seat is limited between the cover plate and the rear side face of the lifting seat. A recess is provided on the rear end face of the slide plate inside the cover plate. A locking element and an elastic element are installed in the recess. A guide groove is provided on the bottom surface of the recess.

5. The up-and-down adjustment mechanism as described in claim 4, characterized in that, The bottom surface of the recess is provided with a guide groove located above the guide groove and extending in the vertical direction. The locking member is provided with a protrusion embedded in the guide groove. The cross-section of the protrusion is circular so that the protrusion is configured to slide along the guide groove and rotate relative to the guide groove.

6. The up-and-down adjustment mechanism as described in claim 5, characterized in that, The elastic element is a spring, with one end of the spring abutting against the side of the locking element near the second side wall and the other end abutting against the inner wall surface of the recess.

7. The up-and-down adjustment mechanism as described in claim 4, characterized in that, A spring is provided on the fixed base. The upper end of the spring is connected to the fixed base, and the lower end extends downward to the top of the slide groove so as to abut against the upper part of the slide when the slide moves upward to the top of the slide groove.

8. The up-and-down adjustment mechanism as described in claim 1, characterized in that, The connecting seat is provided with a guide groove extending vertically. A baffle is detachably fixed on the front side of the lifting seat. The front side of the lifting seat passes through the guide groove from back to front. The baffle is placed on the front side of the connecting seat to place the connecting seat between the lifting seat and the baffle. The elastic component is a tension spring. The upper end of the tension spring is connected to the lifting seat, and the lower end is connected to the connecting seat.

9. The up-and-down adjustment mechanism as described in claim 8, characterized in that, The rear side of the connecting seat, located on both sides of the guide groove, forms a vertically extending mating plane. Rollers that abut against and roll on the mating plane are installed on the lifting seat.

10. A seat, characterized in that, Includes the up-and-down adjustment mechanism as described in any one of claims 1-9.

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