Seat depth adjusting mechanism and learning chair

Abstract

The utility model provides a seat depth adjusting mechanism and a study chair, the seat depth adjusting mechanism comprises a chair seat and a chair back support, the two sides of the chair seat are respectively provided with a hollow sliding rod, the lower part of the chair back support is bent to form a holding part, and the holding part is sleeved with the sliding rods to enable the chair back support to move back and forth; a locking adjusting mechanism is further arranged between the chair back support and the chair seat, the locking adjusting mechanism comprises a handle, a control pin and a locking groove, the locking groove is at least arranged on one side of the chair seat in the front-back direction, the handle is movably connected to the chair back support, and the control pin responds to the action of the handle so as to be inserted into or separated from the locking groove; when the control pin is separated from the locking groove, the chair back bracket can slide back and forth relative to the chair seat under the action of external force. The learning chair comprises a chair back and the seat depth adjusting mechanism. The sliding rod plays a sliding guiding role, and the locking adjusting mechanism is arranged between the chair back support and the chair seat, so that when the chair back support is subjected to leaning force, the reverse supporting force of the chair back support is jointly borne by the sliding rod and the locking groove of the chair seat.

Description

Technical Field

[0001] The utility model relates to the technical field of chairs, in particular to a seat depth adjusting mechanism and a study chair. Background Art

[0002] In modern society, chairs are used for longer periods in daily life and work. Prolonged sitting postures are likely to lead to improper sitting postures, which not only affect visual health but may also have a negative impact on spinal health. Therefore, a high-quality chair is crucial as it can provide good support to users and make them feel comfortable. Similarly, a study chair is an indispensable tool for students. A comfortable study chair can not only significantly improve students' learning efficiency but also contribute to maintaining their physical health.

[0003] Specifically, for children who are shorter in height or thinner in build, if the seat depth of the study chair is too long, the distance between the back and the backrest will be too far, lacking support for the back. Prolonged use will cause fatigue, and the spine may be distorted without proper support, thus affecting the healthy development of the spine. For children who are taller in height or fatter in build, a shorter seat depth will result in their legs not being fully stretched, unstable center of gravity, easy fatigue, and seriously affecting learning efficiency.

[0004] Therefore, a study chair that can adjust the seat depth is particularly important so that everyone can obtain a comfortable learning experience that meets their physical needs. To meet the needs of different users, a new type of study chair design has emerged on the market. It sets a telescopic mechanism behind the backrest and pushes the backrest to move back and forth to achieve the adjustment of the seat depth. However, this method is inconvenient to adjust and cannot be adjusted independently at all. It often requires the assistance of others or the user to leave the seat cushion to adjust.

[0005] To further improve the adjustment, the utility model patent 2016203363656 discloses a chair with adjustable seat depth, specifically: a sliding chassis is placed at the bottom of the seat, under the fixed chassis, and the backrest support part is connected to the sliding chassis. When the backrest support part moves longitudinally along the seat cushion support part, the sliding chassis also moves longitudinally, and the seat depth can be adjusted. This adjustment method changes the seat depth by moving the relative position of the backrest. Its advantage is that it can be adjusted independently while sitting, greatly simplifying the seat depth adjustment process. However, this seat depth adjustment method also has disadvantages: 1. The fixed chassis is made of metal, and there are multiple card holes arranged longitudinally along the seat cushion support part on the two outer side walls for fixing the sliding chassis. Therefore, additional molds are required for processing the card holes, increasing the processing procedures and costs of the chair. 2. The sliding chassis is hung under the fixed chassis, and additional sliding limits need to be added. The installation is inconvenient, it occupies more space in the longitudinal direction, increases the overall thickness of the seat part, and makes the structure redundant and complex. Summary of the Invention

[0006] The purpose of the present utility model is to overcome the deficiencies existing in the above-mentioned prior art, and a seat depth adjustment mechanism is provided. The seat depth adjustment mechanism includes a seat and a backrest support. A slide bar is fixedly provided on each side of the seat. The lower part of the backrest support is bent towards the seat to form a holding part. The holding part is sleeved with the slide bar so that the backrest support can move back and forth relative to the slide bar. The backrest support is connected to the backrest, and thus a relative movement is generated between the backrest and the seat. The present utility model only uses the slide bar as the front-back guide, which is easy to obtain materials and does not require complex installation and processing. The locking groove is arranged on the seat to play a positioning role after sliding adjustment. The sliding guide and positioning are separated, and each performs its own functions. The leaning force received by the backrest support is borne by the seat, and the structure is simple but the reliability is not reduced.

[0007] Then a study chair is provided. The study chair includes a backrest, a chassis and the seat depth adjustment mechanism described above. The seat depth adjustment mechanism changes the seat depth by controlling the movement of the backrest on the slide bar, which is convenient for users to adjust according to their usage requirements.

[0008] The technical solution of the present utility model is realized as follows:

[0009] A seat depth adjustment mechanism includes: a seat and a backrest support. The backrest support is configured to connect to the backrest. A slide bar is fixedly provided on each side of the seat. The slide bar is arranged in a hollow manner. The lower part of the backrest support is bent towards the seat to form a holding part. The holding part is sleeved with the slide bar so that the backrest support can move back and forth relative to the slide bar. A locking adjustment mechanism is further provided between the backrest support and the seat. The locking adjustment mechanism includes a handle, a control pin and a locking groove. The locking groove is arranged at least on one side of the seat in the front-back direction. The handle is movably connected to the backrest support. The control pin is inserted into or disengaged from the locking groove in response to the action of the handle. When the control pin is inserted into the locking groove, the backrest support is in a locked state of being relatively fixed to the seat. When the control pin is disengaged from the locking groove, the backrest support can slide back and forth relative to the seat under the action of an external force.

[0010] Preferably, accommodating grooves are formed by hollowing out both sides of the bottom surface of the seat. The slide bars are arranged in the accommodating grooves in the front-back direction, and the holding parts are also located in the accommodating grooves. Both ends of the slide bars are fixed to the seat, and there are intervals between the rod body of the slide bar and the side wall and the bottom of the accommodating groove to form a hollow. Fixing the slide bars in the accommodating grooves on the bottom surface of the seat makes use of the original thickness of the seat and does not increase the height in the longitudinal direction. Moreover, setting the accommodating grooves on the bottom surface of the seat and designing the slide bars in a hollow manner not only reduces the weight of the seat but also lowers the manufacturing cost.

[0011] Preferably, a lapping portion is formed by protruding at a corresponding position of the accommodating groove, a threaded hole is preset on the lapping portion, through holes are correspondingly arranged at both ends of the sliding rod, and after both ends of the sliding rod are lapped on the lapping portion, they are locked on the lapping portion by screws. The screws are used in cooperation with the preset threaded holes, which not only ensures that the sliding rod can be firmly connected to the backrest bracket, but also simplifies the installation and disassembly processes; during installation, the holding portion of the backrest bracket can be pre-sleeved on the sliding rod in advance, then both ends of the sliding rod are lapped on the lapping portion, and the screws are inserted and locked.

[0012] Preferably, the locking grooves are arranged at the bottom of the accommodating groove, and the positions of the locking grooves are higher than those of the sliding rod; and there are multiple locking grooves, and the distances between adjacent two locking grooves are equal. After the seat depth adjustment is completed, the control pin can be inserted into the locking groove to fix the backrest bracket; the locking position is at the bottom of the accommodating groove. When the backrest bracket receives a backward leaning force, part of the force is borne by the seat, which transfers and disperses the force on the sliding rod, and can provide more stable and reliable support for the backrest bracket and the backrest, avoiding the situation of shaking or loosening when a person leans on the backrest.

[0013] Preferably, the seat includes a soft seat cushion and a hard base, and the locking groove and the base are integrally formed by die casting. The base is integrally formed by die casting. Therefore, the locking groove only needs to be integrally formed with the base without additional processing, which can simplify the manufacturing process, reduce the production cost, and make the product more competitive; it can also make the overall appearance of the base more beautiful and enhance the user's aesthetic experience.

[0014] Preferably, the handle includes a pulling portion and a main body portion. The pulling portion and the control pin are integrally formed at both ends of the main body portion. The main body portion is inserted into a preset through hole at the lower end of the backrest bracket and is rotatably connected to the through hole. The pulling portion is exposed outside the backrest bracket. An elastic member is further provided between the handle and the backrest bracket, and the elastic member makes the control pin tend to be inserted into the locking groove. The pulling portion and the control pin are integrally formed, which avoids the loosening or falling off between components and ensures the stability of the handle during use. The main body portion is inserted into the through hole at the lower end of the backrest bracket and is rotatably connected to the through hole. This design enables the handle to rotate flexibly within a certain range.

[0015] Preferably, the elastic member is a compression spring, and the elastic member is arranged between the main body portion and the bottom of the through hole. The design of using a compression spring as the elastic member can provide certain elasticity and resilience. When the compression spring is compressed, the control pin moves downward, and the backrest bracket can move left and right; when the compression spring extends, the control pin moves upward and is inserted into the locking groove to fix the backrest bracket. Moreover, the setting of the elastic member can reduce the direct contact and friction between the main body portion and the through hole, and reduce the wear between components.

[0016] A learning chair, comprising a backrest and the seat depth adjustment mechanism as described above; the seat depth adjustment mechanism mainly adjusts the seat depth by moving the backrest support that is sleeved on the slide bar at the bottom of the seat, and fixes the backrest support on the slide bar through the locking adjustment mechanism.

[0017] The design starting point, concept and beneficial effects of the present utility model adopting the above scheme are:

[0018] The present utility model provides a seat depth adjustment mechanism, which can adjust the relative position of the backrest and the seat, enabling different users to adjust the depth of the seat according to their own needs to obtain better support and comfort. Specifically, the backrest is connected to the backrest support, the backrest support is sleeved on the slide bar, the slide bar is a smooth rod that plays a role in sliding guidance, and the locking adjustment mechanism that plays a locking role after sliding is arranged between the backrest support and the seat, and is completed by the locking pin cooperating with the locking groove opened on the seat; in this way, when the backrest support is subjected to a leaning force, the reverse support force of the backrest support is jointly borne by the positions of the slide bar and the locking groove of the seat, and the force is more evenly distributed, avoiding single-point force.

[0019] Furthermore, the slide bar is fixed in the accommodation groove at the bottom of the seat. By moving the backrest support to drive the backrest to move together, the adjustment of the seat depth can be realized; the accommodation groove is recessed on both sides of the bottom surface of the seat, making use of the thickness range of the seat itself, which is beneficial to the overall aesthetics and makes the overall structure simpler and more compact; and the locking groove that plays a locking role is integrally formed on the plastic base of the seat, which is convenient for processing.

[0020] Furthermore, a learning chair is provided, comprising a backrest and the above seat depth adjustment mechanism. Description of the Drawings

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the seat in the embodiment of the present utility model

[0022] Figure 2 It is a side view of the seat when the seat is at the maximum seat depth in the embodiment of the present utility model

[0023] Figure 3 It is a side view of the seat when the seat is at the minimum seat depth in the embodiment of the present utility model

[0024] Figure 4 It is a bottom view of the seat in the embodiment of the present utility model

[0025] Figure 5 It is a connection schematic diagram of the base and the backrest support in the embodiment of the present utility model

[0026] Figure 6 It is an exploded schematic diagram of the connection relationship between the base and the backrest support in the embodiment of the present utility model

[0027] Figure 7 Schematic diagram of the connection relationship between the handle and the chair back support in the embodiment of the utility model

[0028] Figure 8 This is an exploded schematic diagram of the locking mechanism in the embodiment of the utility model

[0029] The reference numerals are: backrest 1, backrest connector 2, backrest bracket 3, handle 4, cushion 5, base 6, chassis 7, locking groove 8, slide bar 9, sleeve 10, accommodating groove 11, compression spring 12, control pin 13, knob 14, gripping portion 15, screw 16, through hole 17, lap portion 18, pull portion 4a, main body 4b, through hole 19, maximum seat depth L1, minimum seat depth L2

[0030] 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.

[0031] 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. DETAILED DESCRIPTION

[0032] First, the reference positions of various parts of the present invention are defined. When the seat depth adjustment mechanism and the seat are normally installed and used, the front of the seat is the front end, and the rear of the seat including the position where the backrest is located is the rear end. The front end of the seat is the area away from the backrest, and the rear end of the seat is the area close to the backrest.

[0033] like Figure 1-8 As shown, the utility model provides a seat depth adjustment mechanism, including a chair back 1, a chair back bracket and a seat. In the present embodiment, the chair back bracket includes an arc-shaped chair back connector 2 for connecting the chair back, and a pillar 3 for supporting the chair back connector 2, and the pillar 3 is symmetrically arranged on the left and right sides of the seat 1; the chair back 1 is two elliptical cushions, that is, a double-back structure, which is fixedly connected to the chair back connector 2; the two ends of the chair back connector 2 each extend downward with a vertical rod, and the vertical rod is sleeved and matched with the vertical part of the pillar 3 and is pressed and fixed by a knob 14 with a screw. Because this is not the focus of the utility model, it will not be described in detail.

[0034] The seat of the chair consists of a soft cushion 5 and a rigid base 6, and is supported by a chassis chair leg 7 and a gas rod. The base 6 is made of wood or plastic. In this embodiment, the base 6 is made of rigid plastic that is conducive to processing. The above structure forms a basic seat structure to meet the basic sitting needs. Next, the specific structure for seat depth adjustment will be introduced.

[0035] In order to achieve seat depth adjustment without increasing the overall height of the seat, when the base 6 is molded by die processing, both sides are hollowed out to form accommodation grooves 11, and a sliding rod 9 is fixed in each accommodation groove 11. The lower end of the vertical part of the support column 3 is bent towards the seat to form a holding part 15, and the holding part 15 is sleeved on the sliding rod 9. By moving the backrest bracket, the backrest 1 can move relative to the seat, realizing the adjustment of the seat depth.

[0036] To further fix the backrest bracket after adjustment, a locking adjustment mechanism is also provided between the backrest bracket and the seat; specifically, the locking adjustment mechanism is arranged between the support column 3 and the seat. The locking adjustment mechanism includes a handle 4, a control pin 13 and a locking groove 8. The locking groove 8 is arranged along the front-rear direction on at least one side of the seat. The handle 4 is movably connected to the backrest bracket 3, and the control pin 13 responds to the action of the handle to insert into or disengage from the locking groove; when the control pin is inserted into the locking groove, the backrest bracket is in a locked state of being relatively fixed to the seat.

[0037] Furthermore, both sides of the bottom surface of the base 6 are hollowed out to form accommodation grooves 11, the sliding rod 9 is arranged in the accommodation groove 11 along the front-rear direction, and the holding part 15 is also arranged in the accommodation groove 11. As Figure 6 shown, the cross-section of the sliding rod 9 is rectangular. There is a rectangular through-hole at the front end of the holding part 15. Two sleeves 10 with rectangular cross-sections are connected in the through-hole. The sleeves 10 are clamped and matched with the hole wall of the through-hole through a snap structure, so that the holding part 15 is sleeved on the sliding rod 9 through the sleeves 10; both ends of the sliding rod 9 are fixed to the base 6, and there are gaps between the rod body of the sliding rod 9 and the side wall and the bottom of the accommodation groove 11 to form a void.

[0038] Furthermore, as Figures 4-6 , corresponding positions of the accommodation groove 11 protrude to form a lapping part 18. The lapping part 18 is integrally formed with the base 6. Threaded holes are preset on the lapping part 18. Through holes 17 are correspondingly arranged at both ends of the sliding rod 9. After both ends of the sliding rod 9 are lapped on the lapping part 18, they are locked to the lapping part 18 by screws 16. After the holding part 15 is sleeved on the sliding rod 9, the sliding rod 9 can be installed and fixed to the base 6, and the backrest will not fall off and shake easily due to the leaning of the chair back.

[0039] Furthermore, as Figure 5 、 Figure 6As shown, the locking grooves 8 are arranged at the bottom of the receiving groove 11, and the position of the locking grooves 8 is higher than that of the sliding rod 9. When the control pin 13 is inserted into the locking groove 8, a fit is formed at the position of the locking groove. That is, the position connecting the backrest on the arc-shaped backrest connecting member 2 to the fulcrum position of the seat moves upward and becomes shorter, that is, the force arm becomes shorter, making the overall state of the backrest bracket more stable.

[0040] Further, as Figure 7 and Figure 8 shown, the handle 4 includes a pulling part 4a and a main body part 4b. The pulling part 4a and the control pin 13 are integrally formed at both ends of the main body part 4b. The main body part 4b is inserted into a preset through hole 19 on the holding part 15, and the main body part 4b is rotatably connected to the through hole 19; in addition, an end cap 20 is further included. The end cap 20 has a through hole 21. The main body part 4b is inserted into the through hole 21. After the main body part 4b is hinged to the side wall of the through hole 19 by a pin shaft, the end cap 20 is covered at the orifice position at the lower end of the through hole 19 and locked by screws, aiming to cover the exposed part of the through hole 19.

[0041] In this way, only the pulling part 4a is exposed outside the backrest bracket 3; since the control pin 13 faces upward, in order to enable the control pin 13 to cooperate with the locking groove, a compression spring 12 is provided between the main body part 4b and the backrest bracket 3; specifically, the compression spring 12 is arranged at the bottom of the through hole 19, that is, on the end cap 20. Through the elongation and jacking action of the compression spring 12, the control pin 13 maintains the posture of being inserted into the locking groove 8 under normal conditions; when unlocking is required, by pressing the pulling part 4a, the compression spring 12 is forced to contract, and thus the control pin 13 leaves the locking groove 8, thereby realizing unlocking and the subsequent front-back adjustment of the seat depth.

[0042] Therefore, as Figures 1-3 shown, a learning chair is further provided, including a backrest and the seat depth adjustment mechanism. By sleeving the backrest bracket 3 on the sliding rod 9 under the base 6, the relative position between the backrest 1 and the seat is controlled, and thus different seat depths are adjusted.

[0043] The above embodiments realize the adjustable seat depth. The specific effects of the seat depth adjustment are as Figure 2 and Figure 3 . Figure 2 Fig. Figure 3 is a side view of the seat when the seat is at the maximum seat depth in the embodiment. The distance from the frontmost part of the backrest to the frontmost part of the seat is L1.

[0044] The above has schematically described the present utility model and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present utility model, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present utility model.

Claims

1. A seat depth adjustment mechanism, comprising a seat and a seat back support, the seat back support being configured to connect to a seat back, characterized in that: A sliding rod is fixedly provided on each side of the seat, and the sliding rod is hollowed out. The lower part of the seat back bracket is bent toward the seat to form a gripping portion, and the gripping portion is sleeved with the sliding rod so that the seat back bracket can move forward and backward relative to the sliding rod; a locking adjustment mechanism is also provided between the seat back bracket and the seat, and the locking adjustment mechanism includes a handle, a control pin and a locking groove, and the locking groove is arranged on at least one side of the seat along the front and rear direction. The handle is movably connected to the seat back bracket, and the control pin responds to the movement of the handle to insert or disengage from the locking groove. When the control pin is inserted into the locking groove, the seat back bracket is in a locked state that is relatively fixed to the seat; when the control pin is disengaged from the locking groove, the seat back bracket can slide forward and backward relative to the seat under the action of external force.

2. The seat depth adjustment mechanism according to claim 1, characterized in that: The two sides of the bottom surface of the seat are hollowed out to form a receiving groove, the sliding rod is arranged in the receiving groove along the front-to-back direction, the grip is also in the receiving groove, the two ends of the sliding rod are fixed to the seat, and the rod body of the sliding rod and the side walls and bottom of the receiving groove are spaced to form a hollow.

3. The seat depth adjustment mechanism according to claim 2, characterized in that: The corresponding position of the accommodating groove protrudes to form an overlap portion, a threaded hole is preset on the overlap portion, and through holes are correspondingly provided at both ends of the sliding rod. After the two ends of the sliding rod are overlapped on the overlap portion, they are locked on the overlap portion by screws.

4. The seat depth adjustment mechanism according to claim 2, characterized in that: The locking groove is arranged at the groove bottom of the accommodating groove, and the position of the locking groove is higher than the sliding rod.

5. The seat depth adjustment mechanism according to claim 4, characterized in that: The chair seat comprises a soft seat cushion and a hard base, and the locking groove and the base are integrally formed by a mold.

6. The seat depth adjustment mechanism according to claim 1, characterized in that: The handle includes a pull part and a main body, the pull part and the control pin are integrally formed at the two ends of the main body, the main body is inserted into a preset through hole at the lower end of the seat back bracket and the main body is rotatably connected to the through hole, the pull part is exposed to the outside of the seat back bracket, and an elastic member is also provided between the handle and the seat back bracket, which makes the control pin have a tendency to be inserted into the locking groove.

7. The seat depth adjustment mechanism according to claim 6, characterized in that: The elastic member is a compression spring, and the elastic member is arranged between the main body and the bottom of the through hole.

8. A study chair, characterized in that: The utility model comprises a chair back and a seat depth adjustment mechanism as claimed in any one of claims 1 to 7, wherein the chair back is mounted on a chair back bracket.

Images