Chair seat position adjusting device

Abstract

The utility model provides a chair seat position adjusting device which comprises a base and a chair seat connected to the base in a sliding mode, position locking and unlocking of the chair seat are controlled through pulling, during operation, a sliding trigger piece is acted through a pulling switch, a sliding rod on the sliding trigger piece slides in an inclined mode, then locking teeth are controlled to be matched with or separated from a clamping groove, and the position of the chair seat is adjusted. The position of the chair seat is controlled; when the device is operated, a strenuous pressing process is converted into a simple pulling process, so that the seat position adjusting efficiency and operability are improved.

Description

Technical Field

[0001] The utility model relates to the field of learning chairs, in particular to a chair seat position adjusting device. Background Art

[0002] Some existing seats are configured as sliding structures for different purposes. For example, the seat of an existing learning seat can slide back and forth to change the front and rear distance between the seat and the backrest, and the sliding seat can be locked and unlocked by a locking mechanism; thus, the seat with the front and rear seat depth adjusted can be used normally, meeting the requirements of children of different ages for the front and rear seat depth.

[0003] At present, most of the locking mechanisms on the market adopt a lever principle structure. For example, in the seat adjustment mechanism patent with announcement number CN217906942, the seat body is slidably connected to the bracket, and the bottom end of the seat is rotatably connected to a locking switch. The locking switch includes a pressing part and a locking part. An elastic member is provided between the pressing part and the seat body. When an external force is pressed, the pressing part can cause the elastic member to deform and perform a lever movement relative to the seat body, so that the positioning card head on the locking part is disengaged from the positioning card slot on the support rod, thereby unlocking the seat body; when the external force is removed, the pressing part is reset under the action of the elastic member, and the positioning card head on the locking part is clamped in the positioning card slot on the support rod, thereby locking the seat body. However, there are still problems in actual operation and use.

[0004] Firstly, in order to prevent the pressing part from occupying a large rotation space at the bottom of the seat when being pressed, the rotation connection point between the bottom of the seat and the locking switch is usually close to the front end of the seat. However, this results in the rotation force arm of the pressing part being smaller than the rotation force arm of the locking part. Therefore, it is more laborious to press the pressing part, which is difficult for children with less strength to operate. Secondly, when the positioning card head on the locking part is tightly engaged in the positioning card slot, when the pressing part is pressed, the locking part will also be difficult to withdraw from the positioning card slot due to the tight engagement, making it more laborious to press the pressing part. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a seat position adjustment device, which acts on a sliding trigger member by pulling a switch to make the sliding rod on the sliding trigger member slide obliquely, thereby controlling the locking teeth to engage or separate with the slot; when operating, the device converts the laborious pressing process into a simple pulling process, thereby improving the efficiency and operability of the seat position adjustment.

[0006] The technical solution of the utility model is achieved in this way:

[0007] A seat position adjustment device, comprising:

[0008] a base configured as a sliding support for the seat;

[0009] A seat, which is slidably connected to the base along a front-rear direction;

[0010] The card slots are arranged at intervals along the front-to-back direction on the surface of the base facing the seat;

[0011] A locking tooth, one end of which passes through the seat in the longitudinal direction and is inserted into or disengaged from the slot, and the opposite end of the locking tooth where the locking tooth is inserted into or disengaged from the slot is connected to a sliding rod;

[0012] The control assembly includes a pull switch arranged on the seat, a sliding trigger connected to the pull switch, the sliding trigger is provided with an oblique sliding groove extending obliquely in the longitudinal direction, and the sliding rod is slidably connected in the oblique sliding groove;

[0013] Pulling the switch can drive the sliding trigger to move horizontally under the action of external force, and drive the sliding rod to slide in the oblique sliding groove while driving the locking tooth to be clamped into or out of the clamping groove along the longitudinal direction.

[0014] Preferably, the pull switch includes a pull rod connected to the sliding trigger member, and the pull rod is connected to a handle exposed on the outer peripheral edge of the seat; the pull switch can cause the sliding trigger member to move by pulling the handle, with a simple structure and labor-saving operation.

[0015] Preferably, the handle is arranged in the middle of the front end of the seat to facilitate children to grasp it.

[0016] Preferably, the sliding trigger, the pull rod and the handle are integrally formed, which facilitates processing and assembly.

[0017] Preferably, the seat is a shell structure, and a seat plate is connected to the upper end of the seat, and the pull switch is located between the seat plate and the seat of the shell structure; while the pull switch does not affect the use, the appearance of the seat is optimized.

[0018] Preferably, an avoidance cavity is provided on the sliding trigger member, and when the locking tooth is longitudinally inserted into or disengaged from the slot, the locking tooth simultaneously moves horizontally in the avoidance cavity, thereby preventing the locking tooth from interfering with or getting stuck on the sliding trigger member.

[0019] Preferably, a second elastic member is provided between the pull switch and the seat; the seat position adjustment device has a locked state and an unlocked state; when the device is in the locked state, the locking tooth is stuck in one of the slots; when the device is switched to the unlocked state, the pull switch causes the second elastic member to produce elastic deformation under the pull of external force, and causes the sliding rod to slide in the oblique sliding groove to separate the locking tooth from the slot; when the external force is removed, the second elastic member releases the deformation elastic force to reset the pull switch, at which time the sliding rod slides in the opposite direction of the oblique sliding groove and causes the locking tooth to be stuck in another slot; then the device switches back to the locked state; the second elastic member can make the pull switch reset itself after moving horizontally, making it easier and more efficient to lock or unlock the seat relative to the base.

[0020] Preferably, the second elastic member is a tension spring arranged between the pull switch and the seat.

[0021] Preferably, a guide structure is provided between the pull switch and the seat, the guide structure comprising a guide rod and a guide groove extending in a horizontal direction, the guide groove being arranged on one of the pull switch and the seat, and the guide rod being arranged on the other; the guide groove having a starting end and an ending end, the guide rod sliding between the starting end and the ending end of the guide groove so that the locking tooth engages in or disengages from the groove; the guide structure prevents the pull switch from deviating from a predetermined moving direction when moving, so that the base and the seat can switch between a locked state and an unlocked state.

[0022] Preferably, the distance between the starting end and the ending end of the guide groove ranges from 10 mm to 15 mm.

[0023] The principle and beneficial effects of the utility model using the above technical solution are:

[0024] The utility model provides a seat position adjustment device, which pulls a sliding trigger member by pulling a switch, so that the sliding rod on the sliding trigger member slides obliquely, thereby controlling the locking teeth to cooperate or separate with the card slot; when locking or unlocking the seat position, the switch is no longer controlled by pressing the lever principle, but a pulling switch is used for pulling control, so there is no need to worry about the pressing effort caused by the unreasonable length of the rotating force arm, thereby improving the efficiency and operability of the seat position adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the structure of the seat;

[0026] Figure 2 This is an exploded view of the seat after the seat plate is hidden;

[0027] Figure 3 This is a top view of the seat after the seat plate is hidden;

[0028] Figure 4It is a cross-sectional view of the seat position adjustment device, in which the card slot is inserted into the card slot;

[0029] Figure 5 It is a cross-sectional view of the seat position adjustment device, in which the clamping slot is disengaged from the clamping slot;

[0030] Figure 6 It is an enlarged cross-sectional view of the sliding connection position between the chair back and the chair seat;

[0031] Figure 7 is an enlarged cross-sectional view of the position of the first locking mechanism;

[0032] Figure 8 It is an enlarged cross-sectional view of the sliding connection position between the seat and the base;

[0033] Fig. 9 It is a schematic diagram of the structure of the control component;

[0034] Fig.10 is a schematic structural diagram of various components in the first locking mechanism;

[0035] Fig.11 This is an exploded view of the seat and backrest from another angle;

[0036] Fig.12a This is a schematic diagram of the principle of forming an avoidance space between the seat and the table;

[0037] Figure 12b A schematic diagram of the principle that the seat back support assembly slides forward and backward as a whole and gradually approaches the table;

[0038] Fig.13 This is an enlarged view of the locking teeth snapping into the slot after the seat back support assembly is hidden;

[0039] Fig.14 It is an enlarged view of the coordination of the components at the first locking mechanism position;

[0040] The reference numerals of the figures are: 1-backrest, 2-seat, 3-base, 4-seat plate, 5-seat leg, 6-pull switch, 7-locking tooth, 11-connecting portion, 12-first plug rod, 13-vertical plate, 14-sliding avoidance groove, 15-first guide groove, 16-second guide groove, 21-first locking module, 22-gear tooth, 23-first slide groove, 24-second slide groove, 25-accommodating groove, 26-first limiting screw, 31-slot, 32-support, 33-second plug rod, 34-second slide groove, 35-second slide groove, 36-second slide groove, 37-second slide groove, 38-second slide groove, 39-second slide groove, 40-second slide groove, 41-second slide groove, 42-second slide groove, 43-second slide groove, 44-second slide groove, 45-second slide groove, 46-second slide groove, 47-second slide groove, 48-second slide groove, 49-second slide groove, 50-second slide groove, 51-second slide groove, 52-second slide groove, 53-second slide groove, 54-second slide groove, 55-second slide groove, 56-second slide groove, 57-second slide groove, 58-second slide groove, 59-second slide groove, 60-second slide groove, 61-second slide groove, 62-second slide groove, 63-second slide groove, 64-second slide groove, 65-second slide groove, 66-second slide groove, 67-second slide groove, 68-second slide groove, 69-second slide groove, 70-second slide groove, 71-second slide groove, 72-second slide groove, 73-second slide groove, 74-second slide groove, 75-second 4-second limit screw, 35-annular protrusion, 61-handle, 62-pull rod, 63-sliding trigger, 64-second elastic member, 71-sliding rod, 211-control pull rod, 212-first elastic member, 213-clamping column, 214-end plate, 215-gear slot, 216-groove, 217-handle, 621-anti-wear rib, 622-hook, 631-oblique slide groove, 632-avoidance cavity, a-guide rod, b-guide groove, c-gasket, d-desk. DETAILED DESCRIPTION

[0041] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0042] In the description of the present invention, the term "at least one" refers to one or more than one, unless otherwise clearly defined. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0044] The specific implementation of the utility model is as follows:

[0045] like Figure 1-14 As shown, the utility model provides a seat, a seat position adjustment device is applied to the seat, and the seat comprises:

[0046] The seat back support assembly comprises a seat back 1 and a seat 2, wherein the seat 2 is a shell structure;

[0047] A base 3 is provided at the lower end of the seat back support assembly, and the seat back support assembly as a whole can slide forward and backward on the base 3;

[0048] Under the premise that the chair back 1 and the seat 2 remain relatively fixed, the seat back support assembly as a whole can slide forward and backward relative to the base 3 and stay at a corresponding position, so that the front position of the seat 1 can be adjusted between the front and rear positions.

[0049] Specifically, if Figure 1 As shown, the upper end of the seat 2 is connected to a seat plate 4 for easy sitting, and the lower end of the base 3 is provided with a chair leg 5. The chair leg 5 is connected to the base 3 through a gas rod, so that the base 3 and the seat back support assembly at the upper end of the base 3 can maintain stable support for the seated person.

[0050] Furthermore, the relative fixation of the chair back 1 and the seat 2 is based on the premise that the seat depth of the chair has been set. Under this premise, two structural design schemes can be proposed. The first scheme is that the chair back 1 and the seat 2 of the chair always remain relatively fixed, that is, the chair back 1 and the seat 2 are always fixedly connected together. On this basis, the seat depth of the entire chair has been set and cannot be adjusted. At this time, directly sliding the entire seat back support assembly forward and backward to the predetermined position can make the front position of the seat 1 adjustable between the front and rear positions, thereby quickly making way for avoidance space between the seat and the table.

[0051] Furthermore, in another solution, the chair back 1 and the seat 2 can slide forward and backward, so the seat depth of this chair can be adjusted. On this basis, the relative fixation of the chair back 1 and the seat means that the chair back 1 and the seat 2 slide relative to each other in the forward and backward direction and stay in a predetermined position to complete the seat depth adjustment of the chair. At this time, the entire seat back support assembly is directly slid forward and backward to the predetermined position, and the front position of the seat 1 can also be adjusted between the forward and backward positions, thereby quickly making way for avoidance space between the seat and the table.

[0052] Furthermore, the scheme of sliding back and forth between the chair back 1 and the seat 2 is achieved as follows: one of the chair back 1 and the seat 2 is configured as a sliding member that can slide relative to the other in the front-to-back direction; the other is configured as a sliding support member of the sliding member, and the sliding support member is connected to the base 3 in a sliding manner along the front-to-back direction; when the seat depth is adjusted, the sliding member in the seat back support assembly can slide back and forth relative to the sliding support member and make independent position adjustments, and after the sliding member slides back and forth to a predetermined position, it remains relatively fixed with the sliding support member; after the position adjustment, the sliding support member can slide back and forth relative to the base 3, so that the entire seat back support assembly slides back and forth relative to the base and stays in the corresponding position, so that the seat can adjust the avoidance space between the seat and the table without changing the seat depth, making it convenient for children to get on and off the seat.

[0053] Further, when the chair back 1 is a sliding support, the seat 2 is a sliding member, the left and right sides of the lower end of the chair back 1 can be slidably connected to the base 3 forward and backward, and the seat 1 is slidably connected to the chair back 2 along the front and rear direction; when the seat 2 is a sliding support, the chair back 1 is a sliding member, the seat 2 can be slidably connected to the base 3 forward and backward, and the lower end of the chair back 1 is slidably connected to the seat 2 along the front and rear direction; Figure 2-14 As shown, in this embodiment, the seat is used as a sliding support member and the chair back is used as a sliding member for explanation, that is, the seat 2 is configured as the sliding support member, and the chair back 1 is configured as the sliding member; the seat 2 is slidably connected to the base 3 along the front-rear direction; the chair back 1 can slide forward and backward relative to the seat 2 to adjust the seat depth, and at the same time, the seat 2 can slide forward and backward relative to the base 3, and drive the chair back 1 to slide forward and backward to adjust the avoidance space between the seat and the table.

[0054] Further, if Figure 2 , Figure 6 As shown, the sliding connection between the seat 2 and the chair back 1 is achieved as follows: a connecting portion 11 is symmetrically provided on the left and right sides of the lower end of the chair back 1, and at least two first plug rods 12 spaced front and back are provided on the connecting portion 11, and a first slide groove 23 corresponding to the first plug rod 12 is provided on the seat 2, and the first plug rod 12 is slidably connected in the first slide groove 23, so that the chair back 1 can slide back and forth on the seat 2.

[0055] Furthermore, one end of the first insertion rod 12 passes through the first slide groove 23 in the longitudinal direction, and a first limiting screw 26 is connected to the end of the first insertion rod 12 passing through the first slide groove 23. The first limiting screw 26 can limit the separation of the first insertion rod 12 and the first slide groove 23 in the longitudinal direction, so that the chair back 1 and the seat 2 will not separate in the longitudinal direction when sliding, making the sliding connection effect between the chair back 1 and the seat 2 more stable.

[0056] Furthermore, the left and right sides of the seat 2 are provided with sliding avoidance grooves 14 extending forward and backward, and the sliding avoidance grooves 14 can avoid the connecting part 11 sliding forward and backward. The two connecting parts 11 pass through the sliding avoidance grooves 14 on the left and right sides of the seat 2 respectively, and are connected to each other in the seat 2, so that the left and right sides of the chair back 1 can slide synchronously; when the entire chair back 1 slides, there will be no phenomenon of inconsistent sliding amplitudes on the left and right sides.

[0057] Further, if Figure 7 , Fig.10 , Fig.11 , Fig.14As shown, a first locking mechanism is provided between the chair back 1 and the seat 2, and the first locking mechanism can be regarded as a first locking module 21 that controls the chair back 1 to lock or slide; the first locking mechanism includes a control rod 211 extending toward the seat 2, and a first elastic member 212 acting on the control rod 211, and the control rod 211 is a rigid plastic or metal member; a gear slot 215 is provided at one end of the control rod 211 facing the seat 2, and a plurality of gear teeth 22 spaced front and back are provided on the seat 2; when the chair back 1 is in a locked state, one of the gear teeth 22 is stuck in the gear slot 215; when the chair back 1 is switched When it reaches the unlocked state, the control rod 211 causes the first elastic member 212 to produce elastic deformation under the pulling of external force, and separates the gear tooth 22 from the gear slot 215, and the chair back 1 can slide forward and backward at this time; when the external force is removed, the first elastic member 212 releases the deformation elastic force, and the other gear tooth 22 is stuck in the gear slot 215; at this time, the chair back 1 switches back to the locked state; the first locking mechanism can lock or unlock the sliding chair back 1 according to the child's use needs, so as to facilitate the front and rear adjustment of the seat depth, and keep the chair back 1 and the seat 2 with the seat depth adjusted fixed to meet the child's sitting needs.

[0058] Furthermore, a groove 216 extending inward is provided at the upper end of the control rod 211, and the first elastic member 212 is a compression spring in the groove 216. A limiting structure is provided between the connecting portion 11 and the control rod 211, and the limiting structure includes an end plate 214 provided at one end of the groove 216, and a vertical plate 13 provided on the connecting portion 11 and extending downward and inserted into the groove 216. The two ends of the compression spring are respectively abutted against the vertical plate 13 and the end plate 214. The control rod 211 is subjected to the elastic action of the compression spring in the initial state, so that one of the gear teeth 22 on the seat 2 is stuck in the gear groove 215; when the control rod 211 is pulled by an external force, the end plate 214 slides in the groove 214 relative to the vertical plate 13, and at this time, the compression spring can produce elastic deformation between the vertical plate 13 and the end plate 214; when the external force is removed, the compression spring can provide elastic force and automatically reset the control rod 211.

[0059] Furthermore, a first guide groove 15 is provided on the connecting portion 11, and the control rod 211 is slidably connected in the first guide groove 15 and slides in the first guide groove 15; a second guide groove 16 is provided on the corresponding side wall of the first guide groove 15; a groove 216 protrudes upward from the upper end of the end plate 214, and the protruding part of the end plate 214 is slidably connected in the second guide groove 16, so that the first guide groove 15 and the second guide 16 form a double guide with the control rod 211, thereby making the control rod 211 smoother when being pulled to lock or unlock the position.

[0060] Furthermore, in order to prevent the compression spring from bending upward during elastic deformation or resetting, a clamping column 213 is provided on the end plate 214, and one end of the compression spring facing the end plate 214 is sleeved on the clamping column 213, so that the compression spring can stably elastically deform or reset along the pulling direction of the control rod 211.

[0061] Furthermore, one end of the control rod 211 away from the gear slot 215 is connected to a handle 217. The handle 217 is provided to facilitate the seated person to pull it when sitting, thereby controlling the first locking mechanism to lock or unlock the position of the chair back 1.

[0062] Further, if Figure 8 As shown, the sliding connection between the seat 2 and the base 3 is achieved as follows: a left-right symmetrical plug rod assembly is provided on the base 3, the plug rod assembly includes at least two second plug rods 33 spaced front and back, and a second slide groove 24 corresponding to the second plug rod 33 is provided on the seat 2. The second plug rod 33 is slidably connected in the second slide groove 24, so that the entire seat back support assembly can slide back and forth.

[0063] Furthermore, one end of the second insertion rod 33 passes through the second slide groove 24 in the longitudinal direction, and a second limiting screw 34 is connected to the end of the second insertion rod 33 passing through the second slide groove 24. The second limiting screw 34 can limit the separation of the second insertion rod 33 and the second slide groove 24 in the longitudinal direction, ensuring that the seat back support assembly will not separate from the base 3 when sliding back and forth as a whole, making the sliding connection effect between the seat 2 and the base 3 more stable.

[0064] Furthermore, a gasket c for increasing the contact area is provided between the first limit screw 26 and the seat 2, and between the second limit screw 34 and the seat 2. The gasket c can make up for the problem of insufficient contact area between the head of the first limit screw 26 and the head of the second limit screw 34 and the seat 2, thereby making the sliding connection between the chair back 1 and the seat 2, and the sliding connection between the seat 2 and the base 3 more stable.

[0065] Furthermore, a support 32 for supporting the seat 2 is provided on the base 3. In order to form a stable support for the seat 2, two groups of supports 32 are symmetrically arranged on the base 3. An annular protrusion 35 is provided on the upper end of the support 32. The annular protrusion 35 is in the shape of a plurality of concentric rings. The annular protrusion 35 is supported on the bottom end of the seat 2 to reduce the sliding friction between the seat 2 and the support 32. The annular protrusion 35 is made of PUM plastic with good wear resistance, long service life and high structural strength.

[0066] Further, if Figure 2-5As shown, in order to lock or unlock the position of the seat 2 that slides forward and backward, and thus realize the forward and backward adjustment of the seat back support assembly, a seat position adjustment device is provided between the seat 2 and the base 3, wherein the base 3 is a sliding support member of the seat 2, and the seat 2 is slidably connected to the base 3 along the forward and backward direction; a plurality of grooves 31 are arranged at intervals along the forward and backward direction on the surface of the base 3 facing the seat 2, and a locking tooth 7 is provided on the seat 2, one end of the locking tooth 7 penetrates the seat 2 in the longitudinal direction and is engaged with or disengaged from the groove 31, and the opposite end of the locking tooth 7 engaged with or disengaged from the groove 31 is connected There is a sliding rod 71; the device also includes a control component, the control component includes a pull switch 6 arranged on the seat 2, and a sliding trigger member 63 connected to the pull switch 6, the sliding trigger member 63 is provided with an oblique slide groove 631 extending obliquely in the longitudinal direction, and the sliding rod 71 is slidably connected in the oblique slide groove 631; when controlling the unlocking or locking of the seat 2, the pull switch 6 can drive the sliding trigger member 63 to move horizontally under the action of external force, and prompt the sliding rod 71 to slide in the oblique slide groove 631 while driving the locking tooth 7 to be inserted into or disengaged from the slot 31 along the longitudinal direction.

[0067] Furthermore, the seat 2 is a shell structure, and the upper end of the seat 2 is connected to the seat plate 4, and the pull switch 6 is located between the seat plate 4 and the seat 2 of the shell structure, which optimizes the appearance of the seat 2 without affecting the pulling of the pull switch 6.

[0068] Further, if Fig. 9 As shown, when the sliding rod 71 slides in the oblique sliding groove 613 on the sliding trigger member 63, the locking tooth 7 will be displaced in the longitudinal direction to engage in or disengage from the locking groove 31, and at the same time, the locking tooth 7 will be displaced in the transverse direction relative to the sliding trigger member 63. At this time, in order to prevent the locking tooth 7 from interfering with the sliding trigger member 63, a corresponding avoidance cavity 632 is provided on the sliding trigger member 63. When the locking tooth 7 is relatively horizontally displaced relative to the sliding trigger member 63, the locking tooth 7 will move horizontally in the avoidance cavity 632 to avoid interference or jamming with the sliding trigger member 63.

[0069] Furthermore, the pull switch 6 includes a pull rod 62 connected to a sliding trigger member 63. To facilitate processing and assembly, the sliding trigger member 63, the pull rod 62, and the handle 61 are integrally formed; the pull rod 62 penetrates the seat 2 outward, and is connected to the pull rod 62 with a handle 61 exposed on the outer periphery of the seat 2; the handle 61 exposed on the seat 1 is convenient for children to pull and operate, has a simple structure, and saves effort in operation, thereby more efficiently controlling the seat back support assembly to be locked or unlocked on the base 3.

[0070] Furthermore, a second elastic member 64 is provided between the pull switch 6 and the seat 2. The second elastic member 64 is a tension spring, one end of which is connected to the seat 2, and the other end is connected to the hook 622 of the pull rod 62; the seat position adjustment device has a locked state and an unlocked state; when the device is in the locked state, the locking tooth 7 is stuck in one of the slots 31; when the device is switched to the unlocked state, the pull switch 6 causes the second elastic member 64 to produce elastic deformation under the pull of external force, and causes the sliding rod 71 to slide in the oblique slot 631, so that the locking tooth 7 is separated from the slot 31; when the external force is removed, the second elastic member 64 releases the deformation elastic force, so that the pull switch 6 is reset, at which time the sliding rod 71 slides in the opposite direction in the oblique slot 631, and causes the locking tooth 7 to be stuck in another slot 31; then the device is switched back to the locked state; the second elastic member 64 can make the pull switch 6 reset itself after moving horizontally, so that the seat 2 can be locked or unlocked relative to the base 3 more simply and efficiently.

[0071] Furthermore, an inwardly recessed receiving groove 25 is provided on the outer periphery of the seat 2. To facilitate gripping, the pull switch 6 is located in the middle of the seat 2 and is pulled horizontally in the front-to-back direction. The receiving groove 25 is also provided at the front end of the seat 2. When the seat back support assembly is in a locked state, the handle 61 is completely located in the receiving groove 25, making the outer periphery of the seat 1 simple and unobtrusive, thereby improving the aesthetics of the seat.

[0072] Further, if Fig. 9 As shown, the pull rod 62 is located inside the seat 2, and a plurality of anti-wear ribs 621 extending along the pulling direction of the pull switch 6 are provided at the bottom end of the pull rod 62. The anti-wear ribs 621 can separate the rod body of the pull rod 62 from the seat 2, thereby reducing the contact area between the pull rod 62 and the seat 2, thereby allowing the pull switch 6 to be smoothly pulled forward and backward under the action of an external force, and also preventing wear between the pull rod 62 and the seat 2 due to excessive contact area.

[0073] Further, if Figure 2 As shown, a guide structure is provided between the pull switch 6 and the seat 2, and the guide structure includes a guide rod a and a guide groove b extending in the horizontal direction, the guide groove b is arranged on one of the pull switch 6 and the seat 2, and the guide rod a is arranged on the other; the guide groove b has a starting end and an ending end, and the guide rod a slides between the starting end and the ending end of the guide groove b, so that the locking tooth 7 can be normally engaged in or disengaged from the engaging groove 31; the guide structure can prevent the pull switch 6 from deviating from the predetermined moving direction when moving, thereby switching the base 3 and the seat 2 between a locked state and an unlocked state.

[0074] Furthermore, considering the actual range of movement of the pull switch 6, the distance between the starting end and the ending end of the guide groove b ranges from 10 mm to 15 mm.

[0075] Furthermore, there are three guide structures between the pull switch 6 and the seat 2, two of which are symmetrically arranged at the front end of the handle 61 and the seat 2, and the other is arranged at the end of the pull rod 62 relative to the handle 61. These three guide structures form a triangular guide arrangement, so that all positions of the entire pull switch 6 can be pulled synchronously in a predetermined direction.

[0076] like Figure 12a-12b As shown, in summary, the seat in this embodiment is convenient to use and has good safety. For example, when a child needs to use a seat with an adjusted seat depth to study at the desk d position, the child can unlock the seat position adjustment device and pull the seat back support assembly to make the seat 2 and the base 3 slide relative to each other front and back, and then rely on the seat position adjustment device to lock the position, thereby making an avoidance space between the seat 2 and the desk d for the child to get on and off the seat, and then the child can sit on the seat plate 4 of the seat 2 by stepping on the chair legs 5 or on the ground; after sitting down, the child can unlock the seat again The child can use the seat position adjustment device and step on the chair foot 5 or the ground while using the buttocks to move the seat back support assembly forward to a position close to the desk d for learning; after completing the learning, the child can unlock the seat position adjustment device again and pull the seat back support assembly backward to make the avoidance space between the seat 2 and the desk d again, and get off the seat; the entire seat operation can be completed by the child himself without the assistance of an adult; at the same time, since the seat back support assembly does not rely on pulleys, there is no need to worry about the safety of children when getting on or off the seat or sitting due to the sliding of the pulleys.

[0077] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A seat position adjustment device, characterized in that: include: A base (3) configured as a sliding support member of the seat (2); A seat (2), the seat (2) being slidably connected to the base (3) along a front-rear direction; The card slots (31) are arranged at intervals along the front-to-back direction on the surface of the base (3) facing the seat (2); A locking tooth (7), one end of the locking tooth (7) passing through the seat (2) in the longitudinal direction and being inserted into or disengaged from the slot (31), and the opposite end of the locking tooth (7) being inserted into or disengaged from the slot (31) is connected to a sliding rod (71); A control assembly, comprising a pull switch (6) arranged on a seat (2), and a sliding trigger member (63) connected to the pull switch (6), wherein the sliding trigger member (63) is provided with an oblique sliding groove (631) extending obliquely in the longitudinal direction, and a sliding rod (71) is slidably connected in the oblique sliding groove (631); The pull switch (6) can drive the sliding trigger member (63) to move horizontally under the action of an external force, and cause the sliding rod (71) to slide in the oblique sliding groove (631), while driving the locking tooth (7) to be longitudinally engaged with or disengaged from the locking groove (31).

2. A seat position adjustment device according to claim 1, characterized in that: The pull switch (6) comprises a pull rod (62) connected to a sliding trigger member (63), and the pull rod (62) is connected to a handle (61) exposed at an outer peripheral position of the seat (2).

3. A seat position adjustment device according to claim 2, characterized in that: The handle (61) is arranged at the middle position of the front end of the seat (2).

4. A seat position adjustment device according to claim 2, characterized in that: The sliding trigger member (63), the pull rod (62) and the handle (61) are integrally formed.

5. The seat position adjustment device according to claim 1, characterized in that: The seat (2) is a shell structure, and the upper end of the seat (2) is connected to a seat plate (4), and the pull switch (6) is located between the seat plate (4) and the seat (2) of the shell structure.

6. The seat position adjustment device according to claim 1, characterized in that: The sliding trigger member (63) is provided with an avoidance cavity (632), and when the locking tooth (7) is longitudinally inserted into or released from the slot (31), the locking tooth (7) simultaneously moves horizontally in the avoidance cavity (632).

7. The seat position adjustment device according to claim 1, characterized in that: A second elastic member (64) is provided between the pull switch (6) and the seat (2); the seat position adjustment device has a locked state and an unlocked state; when the device is in the locked state, the locking tooth (7) is stuck in one of the slots (31); when the device is switched to the unlocked state, the pull switch (6) causes the second elastic member (64) to produce elastic deformation under the pull of an external force, and causes the sliding rod (71) to slide in the oblique sliding groove (631), so that the locking tooth (7) is separated from the slot (31); when the external force is removed, the second elastic member (64) releases the deformation elastic force, so that the pull switch (6) is reset, and at this time the sliding rod (71) slides in the opposite direction in the oblique sliding groove (631), and causes the locking tooth (7) to be stuck in another slot (31); then the device switches back to the locked state.

8. The seat position adjustment device according to claim 6, characterized in that: The second elastic member (64) is a tension spring arranged between the pull switch (6) and the chair seat (2).

9. The seat position adjustment device according to claim 1, characterized in that: A guide structure is provided between the pull switch (6) and the seat (2), the guide structure comprising a guide rod (a) and a guide groove (b) extending in a horizontal direction, the guide groove (b) being provided on one of the pull switch (6) and the seat (2), and the guide rod (a) being provided on the other; the guide groove (b) having a starting end and an ending end, the guide rod (a) sliding between the starting end and the ending end of the guide groove (b) so that the locking tooth (7) is engaged in or disengaged from the engaging groove (31).

10. The seat position adjustment device according to claim 9, characterized in that: The distance between the starting end and the ending end of the guide groove (b) ranges from 10 mm to 15 mm.

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