Seat depth adjusting control mechanism

Abstract

The utility model provides a seat depth adjusting control mechanism, which is characterized in that a control rod acted by a first elastic piece is horizontally pulled, so that the control rod is matched with or separated from a gear groove and a gear tooth on the control rod; the seat depth between the chair seat and the chair back is adjusted and controlled; the mechanism adopts a translation control structure, so that the space occupied by the whole control mechanism in the vertical direction is saved, and the overall layout and appearance of the seat are optimized.

Description

Technical Field

[0001] The utility model relates to the field of learning seats, in particular to a seat depth adjustment control mechanism. Background Art

[0002] As a seat that accompanies children in their studies, a learning chair plays an important role in the children's growth and learning process. The seat and back of some learning chairs are fixedly connected, and the legs are fixedly supported at the bottom of the seat; the seat depth is fixed and cannot meet the needs of children of different ages.

[0003] Based on the above situation, seats with adjustable seat depth have appeared on the market. The seat includes a backrest and a seat. The left and right sides of the lower end of the backrest extend forward and are slidably connected to the seat, so that the backrest of the improved learning chair can slide back and forth and change the front and back distance between the two, thereby changing the front and back seat depth of the seat; and this type of seat is provided with a seat depth adjustment control mechanism at the connection position of the backrest and the seat, which should be able to lock and unlock the position of the backrest when the seat depth adjustment is completed; thereby, the seat has both normal use function and seat depth adjustment function to meet the front and back seat depth usage requirements of children of different age groups.

[0004] For example, in the chair patent with announcement number CN205696729, the keel bracket extending from the backrest support part can slide on the seat cushion support part to adjust the seat depth. In the seat cushion support part, the two outer walls on the fixed chassis are provided with a plurality of clamping holes arranged longitudinally along the seat cushion support part. The clamping teeth hinged on the keel bracket can be clamped in the clamping holes to keep the seat cushion support part fixed, but the control of the clamping teeth and the clamping holes requires a sliding handle that is also hinged on the keel bracket. The end of the sliding handle is connected to the front end of the clamping teeth. According to the lever principle, pulling up or pressing down the sliding handle can make the clamping teeth disengage or clamp into the clamping holes, so as to achieve the position locking and unlocking of the backrest support part; but such an adjustment control mechanism has defects.

[0005] In the vertical direction, the sliding handle and the latch need to be hinged on the keel bracket at different heights so that the rotation of the sliding handle can trigger the rotation of the latch. However, the sliding handle and the latch arranged up and down will occupy a large space in the vertical direction. At the same time, the corresponding position of the keel bracket must also reserve space for the sliding handle and the latch to rotate in the vertical direction. Therefore, the entire adjustment control mechanism occupies too much space in the vertical direction, making the structure of the seat cushion support and the backrest support more bloated, affecting the overall layout and appearance of the seat. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a seat depth adjustment control mechanism, which horizontally pulls the control rod acted by the first elastic member to make the control rod and the upper gear groove and the gear tooth cooperate or separate; the mechanism adopts a translation control structure, which saves the space occupied by the entire control mechanism in the vertical direction and optimizes the overall layout and appearance of the seat.

[0007] The technical solution of the utility model is achieved in this way:

[0008] A seat depth adjustment control mechanism, comprising:

[0009] A chair seat configured as a seating support body and a sliding support for a chair back;

[0010] A chair back, wherein the left and right sides of the lower end of the chair back extend forward and form a left-right symmetrical matching portion, and the matching portion is slidably connected to the chair seat along the front-back direction;

[0011] The gear teeth are arranged at intervals on the side of the seat along the front-rear direction;

[0012] A control rod is arranged on the matching portion, and a gear slot is arranged at one end of the control rod facing the side of the seat;

[0013] A first elastic member; the first elastic member acts on the control rod;

[0014] The seat depth adjustment control mechanism has a locked state and an unlocked state. When the mechanism is in the locked state, one of the gear teeth is stuck in the gear slot; when the mechanism is switched to the unlocked state, the control rod causes the first elastic member to produce elastic deformation under the horizontal pulling of external force, and separates the gear tooth from the gear slot, and the chair back can slide forward and backward at this time; when the external force is removed, the first elastic member releases the deformation elastic force, and the control rod is reset horizontally in the opposite direction under the action of the elastic force, and the gear tooth at the corresponding position is stuck in the gear slot; at this time, the mechanism switches back to the locked state.

[0015] Preferably, a first guide groove is provided on the matching portion, and the control rod is slidably connected in the first guide groove, so that the matching portion forms a stable sliding support for the control rod, facilitating the matching of the gear groove on the control rod with the gear tooth on the seat.

[0016] Preferably, a groove is provided on the rod body of the control rod, and the first elastic member is a compression spring in the groove; an end plate is provided at one end of the groove, and the end plate abuts against one end of the compression spring; a vertical plate is provided on the side wall of the first guide groove facing the groove, and the vertical plate is inserted into the other end of the groove and abuts against the other end of the compression spring; when the control rod slides in the first guide groove, the vertical plate slides in the groove and causes the compression spring to produce corresponding elastic deformation; the groove can provide an accommodating space for the compression spring, and the vertical plate sliding in the groove can squeeze the compression spring between the vertical plate and the end plate, so that the control rod can automatically reset after being pulled. The whole structure is simple and ingenious, occupies little vertical space, and further optimizes the appearance and layout of the seat.

[0017] Preferably, a second guide groove is provided on the side wall of the first guide groove facing the compression spring, the end plate extends outward and exceeds the groove, and the part of the end plate exceeding the groove is slidably connected in the second guide groove; a double sliding guide is formed between the control rod and the mating part, thereby making the control rod smoother when pulled horizontally.

[0018] Preferably, a clamping column is provided on the end plate, and one end of the compression spring close to the end plate is sleeved on the clamping column; the clamping column can prevent the compression spring from bending when compressed or reset, making the compression spring more stable when elastically deformed.

[0019] Preferably, a handle is connected to one end of the control lever away from the gear slot to facilitate gripping.

[0020] Preferably, the control rod is a rigid plastic rod or a metal rod; the rigid plastic rod or the metal rod has high structural strength and long service life.

[0021] Preferably, the control rod moves a distance in the range of 10 mm to 12 mm under horizontal pulling of an external force.

[0022] The principle and beneficial effects of the utility model using the above technical solution are:

[0023] The utility model provides a seat depth adjustment control mechanism, which makes the control rod and the gear slot on the control rod cooperate or separate with the gear tooth by horizontally pulling the control rod acted by the first elastic member; compared with the design of using a rotating handle, the whole mechanism adopts a translational control structure, and does not need to leave an avoidance space for the rotation of the rotating handle on the seat or the chair back, so it occupies less space in the vertical direction, facilitates operation and control, and optimizes the layout and appearance of the seat and the chair back in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the structure of the seat;

[0025] Figure 2 This is an exploded view of the seat after the seat plate is hidden;

[0026] Figure 3This is a top view of the seat after the seat plate is hidden;

[0027] Figure 4 It is a cross-sectional view of the locking mechanism, in which the card slot is inserted into the card slot;

[0028] Figure 5 It is a cross-sectional view of the locking mechanism, in which the card slot is disengaged from the card slot;

[0029] Figure 6 It is an enlarged cross-sectional view of the sliding connection position between the chair back and the chair seat;

[0030] Figure 7 It is a cross-sectional enlarged view of the position of the seat depth adjustment control mechanism;

[0031] Figure 8 It is an enlarged cross-sectional view of the sliding connection position between the seat and the base;

[0032] Fig. 9 It is a schematic diagram of the structure of the control component;

[0033] Fig.10 It is a structural schematic diagram of various components in the seat depth adjustment control mechanism;

[0034] Fig.11 This is an exploded view of the seat and backrest from another angle;

[0035] Fig.12a This is a schematic diagram of the principle of forming an avoidance space between the seat and the table;

[0036] 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;

[0037] Fig.13 This is an enlarged view of the latch teeth being inserted into the slots after the seat back support assembly is hidden;

[0038] Fig.14 This is an enlarged view of the coordination of the various components of the seat depth adjustment control mechanism;

[0039] The reference numerals of the figures are: 1-backrest, 2-seat, 3-base, 4-seat plate, 5-seat leg, 6-pull member, 7-grip, 11-matching portion, 12-first plug rod, 13-vertical plate, 14-sliding avoidance groove, 15-first guide groove, 16-second guide groove, 21-seat depth adjustment control module, 22-gear gear, 23-first slide groove, 24-second slide groove, 25-accommodating groove, 26-first limiting screw, 31-grip, 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 4-second limit screw, 35-annular protrusion, 61-handle, 62-pull rod, 63-sliding control member, 64-second elastic member, 71-sliding pin, 211-control 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 column, b-guide groove, c-gasket, d-desk. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The specific implementation of the utility model is as follows:

[0044] like Figure 1-14 As shown, the utility model provides a seat depth, a seat depth control and adjustment mechanism is arranged on the seat, and the seat comprises:

[0045] A seat back support assembly, comprising a seat back 1 and a seat 2;

[0046] A base 3 is disposed 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;

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Furthermore, the scheme of sliding back and forth between the chair back 1 and the chair seat 2 is achieved as follows: one of the chair back 1 and the chair 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 the sliding member remains relatively fixed with the sliding support member after sliding back and forth to a predetermined position; 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.

[0052] 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 backrest is used as a sliding member for explanation, that is, the seat 2 is configured as the sliding support member, and the backrest 1 is configured as the sliding member; the seat 2 is slidably connected to the base 3 along the front-rear direction; the backrest 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 backrest 1 to slide forward and backward to adjust the avoidance space between the seat and the table.

[0053] 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 matching 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 matching 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.

[0054] 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.

[0055] 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 matching parts 11 sliding forward and backward. The two matching 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.

[0056] Further, if Figure 7 , Fig.10 , Fig.11 , Fig.14As shown, a seat depth adjustment control mechanism is provided between the chair back 1 and the seat 2, and the seat depth adjustment control mechanism can be regarded as a seat depth adjustment control module 21 for controlling the locking or sliding of the chair back 1; the mechanism can control the locking or unlocking of the chair back 1, and comprises a plurality of gear teeth 22 arranged at intervals along the front-to-back direction at the side position of the seat 2, and a control rod 211 arranged on the matching portion 11, and a first elastic member 212 acts on the control rod 211; a gear slot 215 is provided at one end of the control rod 211 facing the side position of the seat 2;

[0057] The seat depth adjustment control mechanism has a locking state and an unlocking state. When the mechanism is in the locking state, one of the gear teeth 22 is stuck in the gear slot 215; when the mechanism is switched to the unlocking state, the control rod 211 causes the first elastic member 212 to produce elastic deformation under the horizontal 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 control rod 211 is reset horizontally in the opposite direction under the action of the elastic force, and the gear tooth 22 at the corresponding position is stuck in the gear slot 215; at this time, the mechanism switches back to the locking state; the seat depth adjustment control mechanism can lock or unlock the sliding chair back 1 according to the child's use needs, so that the seat depth of the seat can be adjusted forward and backward, and the seat back 1 and the seat 2 with the seat depth adjusted can be kept fixed to meet the child's sitting needs.

[0058] Furthermore, a first guide groove 15 is provided on the matching portion 11, and the control rod 211 is slidably connected in the first guide groove 15; so that the matching portion 11 forms a stable sliding support for the control rod 211, which facilitates the matching of the gear groove 215 on the control rod 211 with the gear tooth 22 on the seat 2.

[0059] Furthermore, a groove 216 is provided on the rod body of the control rod 211, and the first elastic member 212 is a compression spring in the groove 216; an end plate 214 is provided at one end of the groove 216, and the end plate 214 abuts against one end of the compression spring; a vertical plate 13 is provided on the side wall of the first guide groove 15 facing the groove 216, and the vertical plate 13 is inserted into the other end of the groove 216 and abuts against the other end of the compression spring; when the control rod 211 slides in the first guide groove 15, the vertical plate 13 slides in the groove 216 and causes the compression spring to produce corresponding elastic deformation; the groove 216 can provide a holding space for the compression spring, and the vertical plate 13 sliding in the groove 216 can squeeze the compression spring between the vertical plate 13 and the end plate 214, so that the control rod 211 can automatically reset after being pulled. The entire structure is simple and ingenious, occupies a small vertical space, and further optimizes the appearance and layout of the seat.

[0060] Furthermore, a second guide groove 16 is provided on the side wall of the first guide groove 15 facing the compression spring, the end plate 214 extends outward and exceeds the groove 216, and the portion of the end plate 214 exceeding the groove 216 is slidably connected in the second guide groove 16; a double sliding guide is formed between the control rod 211 and the matching portion 11, thereby making the control rod 211 more stable and smooth when pulled horizontally.

[0061] Furthermore, a clamping column 213 is provided on the end plate 214, and one end of the compression spring close to the end plate 214 is sleeved on the clamping column 213; the clamping column 213 can prevent the compression spring from bending when compressed or reset, making the compression spring more stable when elastically deformed.

[0062] 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 seat depth adjustment control mechanism to lock or unlock the position of the chair back 1.

[0063] Furthermore, the control rod 211 is a rigid plastic rod or a metal rod; the rigid plastic rod or the metal rod has high structural strength and long service life.

[0064] Furthermore, considering the actual horizontal pulling length of the control rod 211, the distance the control rod 211 moves under the horizontal pulling of the external force ranges from 10 mm to 12 mm.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Furthermore, the base 3 is provided with a support 32 for supporting the seat 2. 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.

[0069] Further, if Figure 2-5 As shown, in order to lock or unlock the position between the base 3 and the entire seat back support, a locking mechanism is provided between the base 3 and the seat 2. The base 3 is provided with a plurality of slots 31 spaced apart front to back, and the plurality of slots 31 are evenly distributed along the front to back direction; the locking mechanism includes a control component and a latch 7, the latch 7 penetrates the seat 2 longitudinally and is latched into the slot 31, and the control component is configured to control the latch 7 to be latched into or out of the slot 31, thereby controlling the position locking or unlocking of the base 3 and the seat back support component.

[0070] Furthermore, the control assembly includes a pulling member 6 and a sliding control member 63 connected to the pulling member 6. The pulling member 6 and the sliding control member 63 are rigid plastic or metal members formed in one piece. The sliding control member 63 is provided with an oblique sliding groove 631 extending obliquely in the longitudinal direction. The opposite end of the latch tooth 7 that is engaged in the latch groove 31 is connected with a sliding pin 71, and the sliding pin 71 is slidably connected in the oblique sliding groove 631. The pulling member 6 can drive the sliding control member 63 to move horizontally under the action of an external force, and drive the sliding pin 71 to slide in the oblique sliding groove 631 while driving the latch tooth 7 to engage in or disengage from the latch groove 31 in the longitudinal direction, so that the seat back support assembly can be locked or unlocked when sliding forward and backward. The entire locking mechanism has fewer components, and the sliding groove and slide rod structure is used to achieve the coordination or separation of the latch tooth 7 and the latch groove 31. The entire control process is simple and ingenious, and has high practicality.

[0071] Further, if Fig. 9 As shown, when the sliding pin 71 slides in the oblique sliding groove 613 on the sliding control member 63, the latch tooth 7 will be displaced in the longitudinal direction to engage in or disengage from the latch groove 31, and at the same time, the latch tooth 7 will be displaced in the transverse direction relative to the sliding control member 63. At this time, in order to prevent the latch tooth 7 from interfering with the sliding control member 63, a corresponding avoidance cavity 632 is provided on the sliding control member 63. When the latch tooth 7 is relatively displaced in the transverse direction relative to the sliding control member 63, the latch tooth 7 will move in the avoidance cavity 632 to avoid interference or jamming with the sliding control member 63.

[0072] Furthermore, the pulling member 6 includes a pulling rod 62 connected to the sliding control member 63, the pulling rod 62 penetrates the seat 2 outward, and is connected to a handle 61 exposed on the seat 2; the handle 61 exposed on the seat 1 is convenient for children to pull and operate, thereby more efficiently controlling the position locking or unlocking of the seat back support assembly on the base 3.

[0073] Furthermore, a second elastic member 64 is provided between the sliding control member 63 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; when the seat back support assembly is in the locked state, the latch tooth 7 is stuck in one of the latch grooves 31; when the seat back support assembly is switched to the unlocked state, the pulling member 6 causes the second elastic member 64 to produce elastic deformation under the pulling of external force, and causes the sliding pin 71 to slide in the oblique sliding groove 631, so that the latch tooth 7 is separated from the latch groove 31, at this time the seat back support assembly can slide back and forth; when the external force is removed, the second elastic member 64 releases the deformation elastic force, so that the pulling member 6 is reset, at this time the sliding pin 71 slides in the opposite direction in the oblique sliding groove 631, and causes the latch tooth 7 to be stuck in another latch groove 31; at this time the seat back support assembly is switched back to the locked state; the second elastic member 64 can cause the pulling member 6 to reset itself after moving horizontally, making the position locking or unlocking of the seat back support assembly simpler and more efficient.

[0074] Furthermore, an inwardly recessed receiving groove 25 is provided on the outer periphery of the seat 2. For ease of operation, the pulling member 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, so that the outer periphery of the seat 1 has a simple and unobtrusive appearance, thereby improving the aesthetics of the seat.

[0075] 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 pulling member 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 pulling member 6 to be smoothly pulled forward and backward under the action of external force, and also preventing wear between the pull rod 62 and the seat 2 due to excessive contact area.

[0076] Further, if Figure 2As shown, a guide structure is provided between the pulling member 6 and the seat 2, and the guide structure includes a guide column a and a guide groove b extending in the horizontal direction, the guide groove b is arranged on one of the pulling member 6 and the seat 2, and the guide column a is arranged on the other; the guide groove b has a starting end and an ending end, and the guide column a slides between the starting end and the ending end of the guide groove b, so that the base 3 and the seat back support assembly are switched between a locked state and an unlocked state; the guide structure can prevent the pulling member 6 from deviating from the predetermined moving direction when moving, so that the latch 7 can be normally engaged in or disengaged from the latch groove 31.

[0077] Furthermore, there are three guide structures between the pulling member 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 set at the end of the pull rod 62 relative to the handle 61. These three guide structures form a triangular guiding arrangement, so that all positions of the entire pulling member 6 can be pulled synchronously in a predetermined direction.

[0078] 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 the seat with an adjusted seat depth to study at the desk d position, the child can unlock the locking mechanism and pull the seat back support assembly to make the seat 2 and the base 3 slide relative to each other forward and backward, and then rely on the locking mechanism to lock the position, so that an escape space is made between the seat 2 and the desk d for the child to get on and off the seat. After that, 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, the child can unlock the locking mechanism again, and step on the chair legs 5 or the ground while using the hips to move the seat back support assembly forward to a position close to the desk d for learning; after learning, the child can unlock the locking mechanism again and pull the seat back support assembly backward to make the escape 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 problems caused by the sliding of pulleys when the child gets on and off the seat or sits.

[0079] 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 depth adjustment control mechanism, characterized in that: include: A chair seat (2) configured as a sitting support body and a sliding support member of the chair back (1); A chair back (1), wherein left and right sides of the lower end of the chair back (1) extend forward to form a left-right symmetrical matching portion (11), and the matching portion (11) is slidably connected to the chair seat (2) in a front-rear direction; The gear teeth (22) are arranged at intervals on the side of the seat (2) along the front-rear direction; A control rod (211) is arranged on the matching portion (11), and a gear slot (215) is provided at one end of the control rod (211) facing the side of the seat (2); A first elastic member (212); the first elastic member (212) acts on the control rod (211); The seat depth adjustment control mechanism has a locked state and an unlocked state. When the mechanism is in the locked state, one of the gear teeth (22) is stuck in the gear slot (215); when the mechanism is switched to the unlocked state, the control rod (211) causes the first elastic member (212) to produce elastic deformation under the horizontal pulling of an 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 control rod (211) is reset horizontally in the opposite direction under the action of the elastic force, and the gear tooth (22) at the corresponding position is stuck in the gear slot (215); at this time, the mechanism switches back to the locked state.

2. A seat depth adjustment control mechanism according to claim 1, characterized in that: A first guide groove (15) is provided on the matching portion (11), and the control rod (211) is slidably connected in the first guide groove (15).

3. A seat depth adjustment control mechanism according to claim 2, characterized in that: A groove (216) is provided on the rod body of the control rod (211); the first elastic member (212) is a compression spring located in the groove (216); an end plate (214) is provided at one end of the groove (216), and the end plate (214) abuts against one end of the compression spring; a vertical plate (13) is provided on the side wall of the first guide groove (15) facing the groove (216), and the vertical plate (13) is inserted into the other end of the groove (216) and abuts against the other end of the compression spring; when the control rod (211) slides in the first guide groove (15), the vertical plate (13) slides in the groove (216) and causes the compression spring to generate corresponding elastic deformation.

4. A seat depth adjustment control mechanism according to claim 3, characterized in that: A second guide groove (16) is provided on the side wall of the first guide groove (15) facing the compression spring, the end plate (214) extends outward and exceeds the groove (216), and the portion of the end plate (214) exceeding the groove (216) is slidably connected in the second guide groove (16).

5. A seat depth adjustment control mechanism according to claim 3, characterized in that: A clamping column (213) is provided on the end plate (214), and one end of the compression spring close to the end plate (214) is sleeved on the clamping column (213).

6. A seat depth adjustment control mechanism according to claim 1, characterized in that: One end of the control rod (211) away from the gear slot (215) is connected to a handle (217).

7. The seat depth adjustment control mechanism according to claim 1, characterized in that: The control rod (211) is a rigid plastic rod or a metal rod.

8. The seat depth adjustment control mechanism according to claim 1, characterized in that: The control rod (211) moves within a range of 10 mm to 12 mm when pulled horizontally by an external force.

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