Chair with front-back adjustable chair body

Abstract

The utility model provides a seat with a front-and-back adjustable seat body, which comprises a base and a seat back supporting assembly sliding front and back on the base, and through the design that the whole seat back supporting assembly slides front and back on the base, an avoiding space between the seat and a table can be quickly reserved on the premise of determining the seat depth of the seat, so that a child can sit on the seat conveniently; the seat is simple and practical in structure, a child can operate the seat independently conveniently, and the safety and sitting experience of the seat are improved.

Description

Technical Field

[0001] The utility model relates to the field of study chairs, in particular to a chair with a front-rear adjustable body. Background Art

[0002] As a seat for children to study with, learning chairs play an important role in the children's growth and learning process. The seats and backrests of some learning chairs are fixedly connected, and the chair legs are fixedly supported at the lower end of the seat; the seat depth is fixed and cannot meet the needs of children of different age groups; in order to facilitate children to sit, an avoidance space should be reserved between the seat and the table for children to get on and off the seat, but this kind of seat can only be adjusted by dragging the entire chair forward and backward when in use, and this adjustment method is more laborious.

[0003] The seat or the backrest of the improved learning chair can slide forward and backward and change the front-to-back distance between the two, thereby changing the front-to-back seat depth of the seat to meet the use requirements of children of different age groups for the front-to-back seat depth of the seat.

[0004] For example, in the patent for a front and rear adjustable chair with announcement number CN220069259U, the chair back can be moved horizontally above the seat through the armrest bracket to adjust the seat depth, ensuring that seat users of different ages and heights can lean on the chair back to meet the seat depth adjustment when sitting on the chair.

[0005] For another example, in the patent of the seat front and rear adjustment mechanism with announcement number CN219645365U, the seat front and rear adjustment mechanism can adjust and lock the seat by adjusting the movement of the pull rod. It has a relatively simple structure, is relatively convenient to adjust, and can quickly adjust the seat depth.

[0006] In the above two patents, the seat and the backrest can slide relative to each other to change the distance between the backrest and the seat, thereby realizing the front and rear seat depth adjustment. However, this type of seat with adjustable seat depth cannot take into account the adjustment of the seat depth and the avoidance space at the same time. That is to say, if the seat or the backrest is slid forward and backward to adjust the avoidance space, the front and rear seat depth of the seat will change again. For example, when the seat is close to the table, the seat is adjusted backward to leave an avoidance space in front of the seat for the user to sit down conveniently. However, after sitting down, the user is far away from the front end of the table. At this time, if the seat is pulled forward in the opposite direction, although it can be close to the table, the seat depth is difficult to return to the original seat depth suitable for the user, and therefore cannot meet the sitting needs of children.

[0007] In addition to the above adjustment means, the above learning chair will install pulleys on the chair legs to adjust the avoidance space; when the child sits, it is necessary to pull the chair body to slide the pulleys to leave an avoidance space between the seat and the table. After the child sits, the seat is moved closer to the table for easy learning. However, this adjustment method still has the following defects when applied:

[0008] When a child sits down, the chair body may cause the wheels to slide after being subjected to force, causing the seat to deviate from its original position, posing a safety hazard; even if the child successfully crosses the avoidance space and sits on the chair seat, he or she still needs to return to a position close to the table. At this time, he or she needs to manually grab and pull the edge of the table, which may easily cause the table to tip over, also easily causing a safety hazard; after using the chair for a long time, the chair may also slide to the end away from the table due to the interaction between the body and the table, affecting the child's sitting experience.

[0009] Some learning chairs will replace the pulleys with brake wheels to ensure that the chairs can remain stable front and back when children sit and use them; but the control process of the brake wheels is difficult for children of smaller size and age; at this time, the front and back sliding of the seat requires adult assistance, so when the child sits, the adult needs to pull the entire seat first and then keep it stable so that the child can sit smoothly. After the child sits, the adult needs to move the chair forward as a whole back to a position close to the table, and finally lock the brake wheels; but this adjustment method is more cumbersome to operate and always requires adult assistance, and is not suitable for children to operate alone. Summary of the invention

[0010] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a chair with a forward and backward adjustable seat body. By designing the seat back support assembly to slide forward and backward as a whole on the base, the seat can quickly make way for the avoidance space between the seat and the table under the premise of determining the seat depth, thereby facilitating the seating of children. The seat has a simple and practical structure and is easy for children to operate alone, thereby improving the sitting experience of the seat.

[0011] The technical solution of the utility model is achieved in this way:

[0012] A chair with a front-to-back adjustable body, comprising:

[0013] A seat back support assembly, including a seat back and a seat;

[0014] A base is arranged 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;

[0015] Under the premise that the chair back and the seat remain relatively fixed, the seat back support assembly as a whole can slide forward and backward relative to the base and stay at a corresponding position, so that the front position of the seat can be adjusted between the front and rear positions.

[0016] Preferably, one of the chair back and the chair seat is configured as a sliding member that can slide relative to the other in the front-rear direction; the other is configured as a sliding support member of the sliding member, and the sliding support member is slidably connected to the base in the front-rear direction;

[0017] In the seat back support assembly, the sliding member can slide forward and backward relative to the sliding support member and make independent position adjustments, and after the sliding member slides forward and backward to a predetermined position, it remains relatively fixed with the sliding support member; after the position adjustment, the sliding support member can slide forward and backward relative to the base, so that the entire seat back support assembly slides forward and backward relative to the base and stays in the corresponding position; without changing the seat depth, the avoidance space between the seat and the table can be adjusted to facilitate children getting on and off the seat.

[0018] Preferably, the seat is configured as the sliding support member, and the backrest is configured as the sliding member; the seat is connected to the base in a sliding manner along the front-rear direction; the backrest can slide forward and backward relative to the seat to adjust the seat depth, and at the same time the seat can slide forward and backward relative to the base, and drive the backrest to slide forward and backward to adjust the avoidance space between the seat and the table.

[0019] Preferably, a connecting part is symmetrically provided on the left and right sides of the lower end of the chair back, and at least two first plug rods spaced front and back are provided on the connecting part. A first sliding groove corresponding to the first plug rod is provided on the seat, and the first plug rod is slidably connected in the first sliding groove, so that the chair back can slide back and forth on the seat.

[0020] Preferably, one end of the first insertion rod passes through the first slide groove in the longitudinal direction, and a first limit screw is connected to the end of the first insertion rod passing through the first slide groove, and the first limit screw can limit the separation of the first insertion rod and the first slide groove in the longitudinal direction, thereby making the sliding connection between the chair back and the seat more stable.

[0021] Preferably, both sides of the seat are provided with sliding avoidance grooves extending forward and backward, and the two connecting parts pass through the sliding avoidance grooves on the left and right sides of the seat respectively and are connected to each other in the seat so that the left and right sides of the chair back can slide synchronously.

[0022] Preferably, a first locking mechanism is provided between the chair back and the seat, the first locking mechanism comprising a control rod extending toward the seat, a first elastic member acting on the control rod, the control rod being arranged on the chair back, and a gear slot being provided at one end of the control rod facing the seat, and a plurality of gear teeth spaced front and back are provided on the seat; when the chair back is in a locked state, one of the gear teeth is stuck in the gear slot; when the chair back is switched to an unlocked state, the control rod causes the first elastic member to produce elastic deformation under the pulling of an external force, and separates the gear tooth from the gear slot, at which time the chair back can slide forward and backward; when the external force is removed, the first elastic member releases the deformation elastic force, and causes another gear tooth to be stuck in the gear slot; at this time the chair back switches back to the locked state; the first locking mechanism can lock or unlock the sliding chair back in position 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 and the seat with the seat depth adjusted fixed to meet the child's sitting needs.

[0023] Preferably, a left-right symmetrical plug rod assembly is provided on the base, the plug rod assembly includes at least two second plug rods spaced front and back, and a second slide groove corresponding to the second plug rod is provided on the seat. The second plug rod is slidably connected in the second slide groove, so that the entire seat back support assembly can slide back and forth.

[0024] Preferably, one end of the second insertion rod passes through the second slide groove in the longitudinal direction, and a second limit screw is connected to the end of the second insertion rod passing through the second slide groove, and the second limit screw can limit the separation of the second insertion rod and the second slide groove in the longitudinal direction, so that the sliding connection effect between the seat and the base is more stable.

[0025] Preferably, a support for supporting the seat is provided on the base, an annular protrusion is provided at the upper end of the support, and the annular protrusion is supported on the bottom end of the seat to reduce the sliding friction between the seat and the support.

[0026] Preferably, a second locking mechanism is provided between the base and the seat, and a plurality of slots spaced apart front and rear are provided on the base. The second locking mechanism includes a control component and a latch tooth, which penetrates the seat longitudinally and is latched into the slot. The control component is configured to control the latch tooth to be latched into or out of the slot, thereby controlling the position locking or unlocking of the base and the seat back support component.

[0027] Preferably, the control assembly includes a pulling member and a sliding control member connected to the pulling member, the sliding control member is provided with an oblique sliding groove extending obliquely in the longitudinal direction, the opposite end of the latch tooth that is engaged in the latch groove is connected with a sliding pin, and the sliding pin is slidably connected in the oblique sliding groove; the pulling member can drive the sliding control member to move horizontally under the action of external force, and drive the sliding pin to slide in the oblique sliding groove while driving the latch tooth to engage in or disengage from the latch groove in the longitudinal direction, so that the seat back support assembly can be locked or unlocked when sliding forward and backward.

[0028] Preferably, the pulling member includes a pulling rod connected to the sliding control member, and the pulling rod is connected to a handle exposed on the seat; the handle exposed on the seat is convenient for children to pull and operate, thereby more efficiently controlling the seat back support assembly to lock or unlock its position on the base.

[0029] Preferably, a second elastic member is provided between the pulling member and the seat; when the seat back support assembly is in a locked state, the latch tooth is stuck in one of the latch grooves; when the seat back support assembly is switched to an unlocked state, the pulling member causes the second elastic member to produce elastic deformation under the pulling of an external force, and causes the sliding pin to slide in the oblique sliding groove to separate the latch tooth from the latch groove, and the seat back support assembly can slide back and forth at this time; when the external force is removed, the second elastic member releases the deformation elastic force to reset the pulling member, and at this time the sliding pin slides in the opposite direction in the oblique sliding groove and causes the latch tooth to be stuck in another latch groove; at this time the seat back support assembly switches back to the locked state; the second elastic member can cause the pulling member to reset itself after moving horizontally, making the position locking or unlocking of the seat back support assembly simpler and more efficient.

[0030] Preferably, an inwardly recessed receiving groove is provided on the outer periphery of the seat, and when the seat back support assembly is in a locked state, the handle is completely in the receiving groove, making the outer periphery of the seat simple and improving the aesthetics of the seat.

[0031] Preferably, a guide structure is provided between the pulling member and the seat, the guide structure comprising a guide column and a guide groove extending in a horizontal direction, the guide groove being arranged on one of the pulling member and the seat, and the guide column being arranged on the other; the guide groove having a starting end and an ending end, the guide column slides between the starting end and the ending end of the guide groove, so that the base and the seat back support assembly are switched between a locked state and an unlocked state; the guide structure prevents the pulling member from deviating from a predetermined moving direction when moving, so that the latching teeth can be normally engaged in or disengaged from the latching slot.

[0032] The principle of the utility model using the above technical solution is:

[0033] The utility model provides a chair with a forward and backward adjustable body. By making the seat back support component as a whole slide forward and backward on the base, the seat can quickly make way for an avoidance space between the seat and a table under the premise of determining the seat depth, thereby facilitating the seating of children.

[0034] The beneficial effects of the utility model using the above technical solution are:

[0035] On the premise that the seat depth has been set, the child can easily pull the seat back support assembly backwards when sitting, so that the seat back support assembly slides forward and backward to the predetermined position and stays at the corresponding position, leaving avoidance space between the seat and the table, so that the child can sit on the seat quickly; the entire operation and sitting process can be completed by the child himself, without the need to rely on adult assistance, which improves the sitting experience of the seat.

[0036] After sitting down, the child can use his hips to make the seat back support assembly slide forward to the table for study. There is no need to pull the table to move the entire seat forward, which avoids the safety hazard of the table tipping over, making it safer for children to sit or study in the seat.

[0037] The design that the seat back support assembly can slide back and forth on the base makes it unnecessary to set pulleys on the bottom of the seat. Children do not have to worry about the entire seat suddenly sliding backwards when sitting or the seat gradually moving backwards away from the table when studying. Therefore, this seat simplifies the seat structure and eliminates the safety hazards caused by installing pulleys to ensure that children can sit and study normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of the structure of the seat;

[0039] Figure 2 This is an exploded view of the seat after the seat plate is hidden;

[0040] Figure 3 This is a top view of the seat after the seat plate is hidden;

[0041] Figure 4 is a cross-sectional view of the second locking mechanism, in which the card slot is inserted into the card slot;

[0042] Figure 5 is a cross-sectional view of the second locking mechanism, in which the card slot is disengaged from the card slot;

[0043] Figure 6 It is an enlarged cross-sectional view of the sliding connection position between the chair back and the chair seat;

[0044] Figure 7 is an enlarged cross-sectional view of the position of the first locking mechanism;

[0045] Figure 8 It is an enlarged cross-sectional view of the sliding connection position between the seat and the base;

[0046] Fig. 9 It is a schematic diagram of the structure of the control component;

[0047] Fig.10 is a schematic structural diagram of various components in the first locking mechanism;

[0048] Fig.11 This is an exploded view of the seat and backrest from another angle;

[0049] Fig.12a This is a schematic diagram of the principle of forming an avoidance space between the seat and the table;

[0050] 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;

[0051] Fig.13 This is an enlarged view of the latch teeth being inserted into the slots after the seat back support assembly is hidden;

[0052] Fig.14 It is an enlarged view of the coordination of the components at the first locking mechanism position;

[0053] The reference numerals of the figures are: 1-backrest, 2-seat, 3-base, 4-seat plate, 5-chair foot, 6-pull member, 7-grip, 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-grip, 32-support, 33-second plug rod, 34 -Second limit screw, 35-annular protrusion, 61-handle, 62-pull rod, 63-sliding control member, 64-second elastic member, 71-sliding pin, 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 column, b-guide groove, c-gasket, d-desk. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The specific implementation of the utility model is as follows:

[0058] like Figure 1-14 As shown, the utility model provides a chair with a front-rear adjustable chair body, comprising:

[0059] A seat back support assembly, comprising a seat back 1 and a seat 2;

[0060] 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;

[0061] On 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 2-14As 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 for controlling the locking or sliding of the chair back 1; the first locking mechanism comprises 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; the control rod 211 is provided on the chair back 1, and 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 apart from each other 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 seat back 1 is switched to the unlocked state, the control rod 211 causes the first elastic member 212 to produce elastic deformation under the pull of external force, and separates the gear tooth 22 from the gear slot 215, and the seat 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 causes the other gear tooth 22 to be stuck in the gear slot 215; at this time, the seat back 1 switches back to the locked state; the first locking mechanism can lock or unlock the sliding seat 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 seat back 1 and the seat 2 with the seat depth adjusted fixed to meet the child's sitting needs.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] Further, if Figure 2-5As shown, in order to lock or unlock the position between the base 3 and the entire seat back support, the base 3 and the seat 2 are provided with a second locking mechanism, and the base 3 is provided with a plurality of front-to-back spaced slots 31, and the plurality of slots 31 are evenly distributed along the front-to-back direction; the second locking mechanism includes a control component and a latch tooth 7, the latch tooth 7 penetrates the seat 2 longitudinally and is latched into the slot 31, and the control component is configured to control the latch tooth 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.

[0080] 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 second locking mechanism has fewer components, and a 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.

[0081] 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.

[0082] 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.

[0083] Furthermore, a second elastic member 64 is provided between the pulling member 6 and the seat 2, and 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 pulling 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.

[0084] 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.

[0085] 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.

[0086] Further, if Figure 2 As 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.

[0087] 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.

[0088] 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 second 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 second 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 second 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 second 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.

[0089] 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 chair with a front-to-back adjustable body, characterized in that: include: A seat back support assembly, comprising a seat back (1) and a seat (2); A base (3) is arranged 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); Under the premise that the chair back (1) and the chair 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, thereby adjusting the front position of the chair seat (2) between the front and rear positions.

2. A chair with a forward and backward adjustable body according to claim 1, characterized in that: 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-rear direction; the other is configured as a sliding support member of the sliding member, and the sliding support member is slidably connected to the base (3) in the front-rear direction; In the seat back support assembly, the sliding member can slide forward and backward relative to the sliding support member and independently adjust its position, and after the sliding member slides forward and backward to a predetermined position, it remains relatively fixed with the sliding support member; after the position adjustment, the sliding support member can slide forward and backward relative to the base (3), so that the entire seat back support assembly slides forward and backward relative to the base and stays at a corresponding position.

3. The chair with a forward and backward adjustable body according to claim 2, characterized in that: 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.

4. The chair with a forward and backward adjustable body according to claim 3, characterized in that: 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 insertion rods (12) are provided on the connecting portion (11) and are spaced apart from each other in the front and rear direction. A first sliding groove (23) corresponding to the first insertion rod (12) is provided on the chair seat (2), and the first insertion rod (12) is slidably connected in the first sliding groove (23), so that the chair back (1) can slide forward and backward on the chair seat (2).

5. The chair with a forward and backward adjustable body according to claim 3, characterized in that: One end of the first insertion rod (12) passes through the first sliding 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 sliding groove (23), and the first limiting screw (26) can limit the first insertion rod (12) and the first sliding groove (23) from separating in the longitudinal direction.

6. The chair with a forward and backward adjustable body according to claim 3, characterized in that: The left and right sides of the seat (2) are both provided with sliding avoidance grooves (14) extending forward and backward, and the two connecting parts (11) respectively pass through the sliding avoidance grooves (14) on the left and right sides of the seat (2) and are connected to each other in the seat (2) so that the left and right sides of the chair back (1) slide synchronously.

7. The chair with a forward and backward adjustable body according to claim 3, characterized in that: A first locking mechanism is provided between the chair back (1) and the seat (2), the first locking mechanism comprising a control rod (211) extending toward the seat (2), and a first elastic member (212) acting on the control rod (211); the control rod (211) is provided on the chair back (1), and 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 apart from each other are provided on the seat (2); when the chair back (1) is in a locked state, A gear tooth (22) is stuck in the gear slot (215); when the chair back (1) is switched to the unlocked state, the control pull rod (211) causes the first elastic member (212) to produce elastic deformation under the pull of an external force, and causes the gear tooth (22) to separate from the gear slot (215), and the chair back (1) can slide forward and backward; when the external force is removed, the first elastic member (212) releases the deformation elastic force, and causes another gear tooth (22) to be stuck in the gear slot (215); at this time, the chair back (1) is switched back to the locked state.

8. The chair with a forward and backward adjustable body according to claim 3, characterized in that: A left-right symmetrical plug rod assembly is provided on the base (3), the plug rod assembly comprising at least two second plug rods (33) spaced apart from each other in the front and rear direction, a second slide groove (24) corresponding to the second plug rod (33) is provided on the seat (2), and the second plug rod (33) is slidably connected in the second slide groove (24), so that the entire seat back support assembly can slide forward and backward.

9. The chair with a forward and backward adjustable body according to claim 8, characterized in that: One end of the second insertion rod (33) passes through the second sliding 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 sliding groove (24), and the second limiting screw (34) can limit the second insertion rod (33) and the second sliding groove (24) from separating in the longitudinal direction.

10. The chair with a forward and backward adjustable body according to claim 3, characterized in that: A support (32) for supporting the seat (2) is provided on the base (3), an annular protrusion (35) is provided at the upper end of the support (32), and 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).

11. The chair with a forward and backward adjustable body according to claim 3, characterized in that: A second locking mechanism is provided between the base (3) and the seat (2); a plurality of slots (31) spaced apart from each other are provided on the base (3); the second locking mechanism comprises a control component and a latching tooth (7); the latching tooth (7) penetrates the seat (2) in the longitudinal direction and is latched into the slot (31); the control component is configured to control the latching tooth (7) to latch into or disengage from the slot (31), thereby controlling the position locking or unlocking of the base (3) and the seat back support component.

12. The chair with a forward and backward adjustable body according to claim 11, characterized in that: The control assembly comprises a pulling member (6) and a sliding control member (63) connected to the pulling member (6); the sliding control member (63) is provided with an oblique sliding groove (631) extending obliquely in the longitudinal direction; the end of the latching tooth (7) that is latched into the latching groove (31) is connected with a sliding pin (71); 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 latching tooth (7) to latch into or disengage from the latching groove (31) in the longitudinal direction.

13. The chair with a forward and backward adjustable body according to claim 12, characterized in that: The pulling member (6) comprises a pulling rod (62) connected to the sliding control member (63), and the pulling rod (62) is connected to a handle (61) exposed on the seat (2).

14. The chair with a forward and backward adjustable body according to claim 12, characterized in that: A second elastic member (64) is provided between the pulling member (6) and the seat (2); when the seat back support assembly is in a locked state, the latching tooth (7) is latched in one of the latching grooves (31); when the seat back support assembly is switched to an unlocked state, the pulling member (6) causes the second elastic member (64) to produce elastic deformation under the pull of an external force, and causes the sliding pin (71) to slide in the oblique sliding groove (631), so that the latching tooth (7) is separated from the latching groove (31), and the seat back support assembly can slide forward and backward at this time; when the external force is removed, the second elastic member (64) releases the deformation elastic force, so that the pulling member (6) is reset, and the sliding pin (71) slides in the opposite direction in the oblique sliding groove (631), and causes the latching tooth (7) to be latched in another latching groove (31); at this time, the seat back support assembly switches back to the locked state.

15. The chair with a forward and backward adjustable body according to claim 13, characterized in that: An inwardly recessed receiving groove (25) is provided on the outer periphery 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).

16. The chair with a forward and backward adjustable body according to claim 12, characterized in that: A guide structure is provided between the pulling member (6) and the seat (2), the guide structure comprising a guide column (a) and a guide groove (b) extending in a horizontal direction, the guide groove (b) being provided on one of the pulling member (6) and the seat (2), and the guide column (a) being provided on the other; the guide groove (b) having a starting end and an ending end, the guide column (a) sliding 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.

Images