Seat depth adjusting mechanism and multipurpose seat

Abstract

The utility model provides a seat depth adjusting mechanism and a multi-purpose seat, the seat depth adjusting mechanism comprises a seat, front legs and rear legs, the front legs and the rear legs are respectively arranged in pairs left and right, a front cross bar is connected between the two front legs, a rear cross bar is connected between the two rear legs, the seat is lapped on the front cross bar and the rear cross bar, and the front cross bar is connected with the rear cross bar. A front positioning groove group and a rear positioning groove group are concavely formed in the bottom surface of the chair seat, each positioning groove group comprises a plurality of positioning grooves which are arranged in parallel at intervals, the two ends of each positioning groove are communicated with the side of the chair seat, the positioning grooves are arranged along the width direction of the chair seat, and after the front and rear positions of the chair seat are adjusted, the front cross rod and the rear cross rod are lapped in the positioning grooves at the corresponding positions; the multipurpose seat comprises a seat back and the seat depth adjusting mechanism. By adjusting the front-back position of the chair seat, the transverse rod is matched with the chair seat positioning grooves in different positions, the depths of the chair seat are different, and the mode is simple and effective.

Description

Technical Field

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

[0002] A training chair is broadly defined as a chair that is convenient for training in all kinds of places, including conference chairs, news chairs, dictation chairs, training chairs, reception chairs, etc. As people pay more attention to comfort, the market demand for training chairs is gradually rising. In modern society, long periods of sitting have become the norm, so it is essential to have a comfortable training chair that conforms to ergonomic design. Such a chair can not only adjust the posture, but also effectively reduce the fatigue caused by long periods of sitting, providing users with a more comfortable learning and working experience.

[0003] Training chairs are suitable for various training and reception places due to their simple appearance. They are small in size and save space. Although they are not as easy to add various shapes and functions as office chairs, some manufacturers are still committed to expanding their simple functions. For example, after meeting the sitting needs, they add a writing function by adding a writing board, and adjust the position of the writing board to meet the needs of people of different body shapes. The following are found through research:

[0004] Patent No. CN202320022365.9 discloses a foldable training chair with a writing function. The user sits on the folding chair body and rotates the writing device in front of him. The writing board can be adjusted to a suitable position according to the user's body shape. This device is suitable for all kinds of people, has strong adaptability, and improves the user's comfort.

[0005] Patent No. CN202320325585.9 discloses a rotatable student training chair with a writing board, which can adjust the height of the writing board to facilitate use by people of different heights and weights. After use, the writing board can also be folded and contracted to reduce space occupancy.

[0006] Both of the above products meet the needs of different groups of people by adjusting the writing board to improve the comfort of the chair. However, the core issue of seat depth has not been resolved, which means that although ordinary training chairs can meet the needs of most people, they still provide a poor sitting experience for a small number of fat and thin people. Therefore, for people of different fat and thin sizes, such an adjustment mechanism is needed that can easily and directly adjust the seat depth. Regardless of the body shape of the person, a suitable seat depth can give people a better experience. Summary of the invention

[0007] The purpose of the utility model is to overcome the deficiencies existing in the above-mentioned prior art and provide a seat depth adjustment mechanism; the seat depth adjustment mechanism comprises a front and rear cross bars and two front and rear positioning groove groups, each positioning groove group comprises a plurality of positioning grooves which are through-through and parallel on both sides, and the front and rear cross bars are placed in the positioning grooves at corresponding positions to achieve the front and rear position adjustment of the seat to meet the needs of people of corresponding body shapes to sit.

[0008] Then a multi-purpose chair which can be used for training, meeting guests and the like is provided. The training chair comprises a chair back and the seat depth adjustment mechanism. The seat depth adjustment mechanism is convenient for users to adjust the seat depth according to actual use requirements. The use is more reasonable and humane.

[0009] The technical solution of the utility model is achieved in this way:

[0010] A seat depth adjustment mechanism, comprising:

[0011] The seat, front legs and rear legs are arranged in pairs on the left and right. A front cross bar is connected between the two front legs, and a rear cross bar is connected between the two rear legs. The seat is placed on the front cross bar and the rear cross bar. Two front and rear positioning groove groups are recessed on the bottom surface of the seat. Each positioning groove group includes a plurality of positioning grooves arranged in parallel at intervals, and both ends of the positioning grooves are connected to the sides of the seat. The positioning grooves are arranged along the width direction of the seat. After the front and rear positions of the seat are adjusted, the front cross bar and the rear cross bar are placed in the positioning grooves at corresponding positions.

[0012] Preferably, the bottom surface of the seat and the rear cross bar are tied together by a connecting piece after being overlapped to prevent them from being separated. The bottom surface of the seat is preset with a plurality of mounting holes near the rear cross bar, and the mounting holes are arranged along the front-to-back direction. After the seat is moved forward and backward to adjust the seat depth, the connecting piece is connected to the corresponding mounting hole to be fixed. The connecting piece fixes the seat to the rear cross bar, which can prevent the rear cross bar from being separated from the positioning groove due to the forward tilting of the center of gravity when a person stands up from the seat, thereby preventing the seat from tipping over.

[0013] Preferably, the connecting member includes a bridge member and a screw, a nut is embedded in the mounting hole, and through holes are preset at both ends of the bridge member. The bridge member spans the rear cross bar in the front-to-back direction, and the through holes are aligned with the corresponding mounting holes, and then the screws are locked in to connect and fix the bridge member to the bottom surface of the seat. Specifically, the bridge member spans the rear cross bar in the front-to-back direction, and the screws are locked in after the through holes are aligned with the mounting holes, so that the bridge member is firmly connected to the bottom surface of the seat. The nuts embedded in the mounting holes further ensure the stability and durability of the connection. The combined use of the bridge member and the screws not only improves the anti-tilting ability of the seat, but also simplifies the installation and maintenance process. After the screws are locked, the entire structure becomes more stable and can effectively resist the tendency of the seat to detach.

[0014] Preferably, the cross section of the rear cross bar is square or circular, the bridge member includes a middle portion and a connecting portion integrally formed with the middle portion, the through hole is arranged on the connecting portion, the middle portion is square or semicircular in shape, after the middle portion presses the rear cross bar into the positioning groove on the bottom surface of the seat, the through hole is aligned with the corresponding mounting hole. The cross section of the rear cross bar is consistent with the shape of the middle portion of the bridge member, so that the two can fit better, thereby achieving a tighter connection.

[0015] Preferably, at least the bottom surface of the seat and the rear cross bar are tied together by a connecting piece after being overlapped to prevent them from being disengaged. The seat bottom is preset with a plurality of threaded mounting holes at the bottom of the positioning groove that matches the rear cross bar. The connecting piece is a screw, and a through hole is provided on the rear cross bar in the radial direction. A nut is embedded in the mounting hole. The screw passes through the through hole of the rear cross bar and is locked into the mounting hole to fix the rear cross bar and the seat together. Specifically, this connection method only requires the screw to pass through the through hole of the rear cross bar and lock it into the mounting hole to complete the fixation. The connecting piece described in the above paragraph is not required. The operation is simple and the installation efficiency is high.

[0016] Preferably, the cross section of the front cross bar and the rear cross bar is circular, the positioning groove matched with the rear cross bar is an arc groove larger than a semicircle, and the notch width of the positioning groove matched with the rear cross bar is smaller than the diameter of the rear cross bar, and the notch is deformed when the seat is pressed down, so that the rear cross bar is not easy to fall out after being stuck in the corresponding positioning groove. Specifically, since the notch width of the positioning groove is smaller than the diameter of the rear cross bar, when the seat is pressed down, the notch of the positioning groove will produce a certain deformation, and the rear cross bar will be firmly stuck. This design ensures that the rear cross bar will not fall out easily when subjected to external force, thereby improving the stability of the entire structure. The installation process is simpler, and the fixing can be completed without complicated tools and steps, saving installation costs and manpower. The design of the arc groove provides a larger contact area, so that the rear cross bar can evenly distribute the pressure when subjected to force. The circular cross bar cooperates with the arc groove larger than a semicircle, and the seat is not locked on the cross bar. The seat can be rotated and folded and placed, saving space.

[0017] Preferably, the positioning groove matched with the front cross bar is a semicircular groove. The semicircular groove can accurately match the circular cross section of the front cross bar, ensuring that the front cross bar can be accurately positioned during installation, avoiding the possibility of deviation and misalignment.

[0018] Preferably, each positioning groove group includes 2-4 positioning grooves arranged in parallel with each other at intervals in front and back. Providing multiple positioning grooves can produce multiple seat depths, so that the adjustment range has a larger selection room and can adapt to the choices of more people.

[0019] A multi-purpose chair comprises a chair back and a seat depth adjustment mechanism; the seat depth adjustment mechanism is mainly achieved by placing a rear cross bar in different positioning slots of a rear positioning slot group, and placing a front cross bar in a corresponding front positioning slot. The chair back can be fixed with a connecting piece, or the cross bar can be directly inserted into the positioning slot, so as to adjust the seat depth to suit people of different weights.

[0020] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0021] The utility model provides a seat depth adjustment mechanism, which is particularly used for training chairs. By adjusting the front and rear positions of the seat, the crossbar is matched with the seat positioning grooves at different positions, so that the seat depth is different. The method is simple and effective. When people of different body shapes use it, the training chair can be made more comfortable and more humane by adjusting the seat depth adjustment mechanism.

[0022] Furthermore, the crossbar is placed in the positioning groove, and a connector can be selected to be pressed under the crossbar, and the seat is fixed to the crossbar with screws through the through holes, so that the stability of the seat is guaranteed. In addition, as another installation and fixing method that does not require connectors, a crossbar with a circular cross section and a positioning groove with an arc cross section are used. The diameter of the crossbar is larger than the diameter of the positioning groove. The seat can be pressed down to deform the notch and the crossbar can be inserted into the positioning groove, so that the installation cost of the training chair is further reduced. Another advantage of this method is that the front part of the seat is not bound by the front crossbar, so when the training chair is not in use, the seat can be rotated upward and folded for placement, saving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the seat in Example 1 of the present utility model;

[0024] Figure 2 This is a bottom view of the chair in Embodiment 1 of the present invention when the seat is leaning back;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the seat in Example 1 of the present invention when the seat is leaning back;

[0026] Figure 4 This is a bottom view of the chair in Embodiment 1 of the present invention when the seat is facing forward;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the chair in Example 1 of the present invention when the seat is forward;

[0028] Figure 6 This is an exploded schematic diagram of the seat being fixed to the crossbar via a connecting piece in Example 1 of the present invention;

[0029] Figure 7 It is a cross-sectional schematic diagram of the seat locating hole in Embodiment 1 of the present utility model;

[0030] Figure 8 This is an exploded schematic diagram of the seat being fixed to the rear crossbar by screws in Example 2 of the present invention;

[0031] Fig. 9 This is an exploded schematic diagram of the cross bar in Example 3 of the present invention being inserted into the positioning groove without the need for a connecting piece.

[0032] The reference numerals of the drawings are: seat 1, front leg 2, rear leg 3, front cross bar 4, rear cross bar 5, seat back 6, bridge 7, mounting hole 8, front positioning groove group 9, rear positioning groove group 10, through hole 11, screw 12, middle part 13, connecting part 14, front positioning groove 9a, rear positioning groove 10a, seat depth L1 of seat in state 1 of embodiment 1, seat depth L2 of seat in state 2 of embodiment 1 DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] The specific implementation of the utility model is as follows:

[0037] Embodiment 1: First, define the reference orientation of each part of the present invention. 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 of the backrest 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.

[0038] like Figure 1-7As shown, the utility model provides a seat depth adjustment mechanism, including a chair seat 1, a pair of front legs 2, a pair of rear legs 3, a front cross bar 4, a rear cross bar 5, a front leg and a rear leg cross at one side to form an X-shaped bracket, the front leg extends backward beyond the crossing position to connect to the chair back 6; the rear leg extends forward beyond the crossing position to connect to the chair armrest; the front cross bar 4 is connected between the upper parts of the pair of front legs 2, and the rear cross bar 5 is connected between the upper parts of the pair of rear legs 3, the front cross bar 4 and the rear cross bar 5 have the same height, and the chair seat 1 is placed above the front and rear cross bars 4 and 5; the above structure forms a basic seat structure to meet basic sitting needs, and other structures are required if the seat depth needs to be further adjusted.

[0039] The core of this embodiment is that in order to achieve the adjustment of the seat depth, two positioning groove groups, a front positioning groove group 9 and a rear positioning groove group 10, are set on the bottom surface of the seat 1, and each positioning groove group includes a plurality of parallel positioning grooves that penetrate on both sides; in this embodiment, the front positioning groove group 9 includes two spaced-apart parallel front positioning grooves 9a, and the rear positioning groove group 10 includes two spaced-apart parallel rear positioning grooves 10a; the cross-sections of all the above positioning grooves are arc-shaped; the seat is placed on the rear cross bar 5 and the front cross bar 4; the rear cross bar 5 is placed in any rear positioning groove 10a of the rear positioning groove group 10, and the front cross bar 4 is placed in the front positioning groove 9a corresponding to the front positioning groove group 9, and the seat 1 is moved forward and backward, which can basically achieve the adjustment of the seat depth.

[0040] In order to prevent the seat from being separated from the crossbar and to make the seat 1 more stable, a pair of connectors are used to fix the seat 1 to the rear crossbar 5. Specifically, the bottom surface of the seat is preset with multiple mounting holes 8 near the rear crossbar, and the mounting holes 8 are arranged along the front-to-back direction; in this embodiment, the connector includes a bridge 7 and a screw 12, and the bridge is in the shape of an arch bridge, with a semicircle in the middle and a section extending outward on both sides as a connecting part; there is a through hole 11 on each of the two connecting parts, and the spacing between the two through holes 11 is consistent with the spacing between two adjacent mounting holes 8; the bridge 7 crosses the rear crossbar in the front-to-back direction, and after the through hole 11 is aligned with the corresponding mounting hole 118, the screw 12 is locked to connect and fix the bridge 7 to the bottom surface of the seat, so that the seat 1 can be firmly fixed on the rear crossbar 5. It can not only effectively resist the tendency of the seat to be disengaged, but also adjust the seat depth by placing the rear crossbar in different positioning grooves.

[0041] In summary, a seat depth adjustment mechanism of this embodiment is as follows: Figure 2 As shown, the basic seat depth adjustment is achieved by moving the seat 1 forward and backward and placing it in the corresponding positioning groove after the movement. In order to make the seat stable, the rear crossbar is connected and fixed to the seat with a connecting piece, which can prevent the seat from tipping over due to the change of the center of gravity.

[0042] Further, if Figure 6As shown, the connecting member includes a bridge member 7 and a screw 12, a nut is pre-embedded in the mounting hole 8, and through holes 11 are preset at both ends of the bridge member 7. After the bridge member 7 crosses the rear cross bar 5 in the front-to-back direction and the through holes 11 are aligned with the corresponding mounting holes 8, the screws 12 are screwed in to connect and fix the bridge member 7 to the bottom surface of the seat 1. The seat 1 is fixed to the rear cross bar 5 by the simple combination of the bridge member 7 and the screw 12, which greatly improves the anti-tilting ability of the seat 1. After the screw 12 is locked, the overall structure is more stable.

[0043] Furthermore, the cross-section of the rear cross bar 5 is circular or square, the bridging member 7 includes a middle portion 13 and a connecting portion 14 integrally formed with the middle portion 13, the through hole 11 is provided on the connecting portion 14, the shape of the middle portion 13 is circular or square, after the middle portion 13 presses the rear cross bar 5 into the positioning groove on the bottom surface of the seat 1, the through hole 11 is aligned with the corresponding mounting hole 8, the cross-sectional shape of the rear cross bar 5 is consistent with the shape of the middle portion 13 of the bridging member 7, so that the two fit more closely, thereby making the seat 1 tightly fixed on the rear cross bar 5.

[0044] In summary, in Embodiment 1, the problem of the seat depth not being adjustable is solved by placing the rear cross bar in different positioning grooves, and the seat is further fixed to the rear cross bar by a connecting piece to ensure the safety of the seat. On the premise that the rear cross bar 5 is a round tube, the seat can be flipped upwards when not in use for storage.

[0045] Embodiment 2: This embodiment differs from Embodiment 1 in that the bridge piece is omitted and a simpler screw is used for fixing. Specifically, Figure 8 As shown, the screw 12 is used as a connecting piece, and a through hole 11 is provided in the radial direction on the rear cross bar 5; a mounting hole 8 is provided in the rear positioning groove 10a, and a nut is pre-embedded in the mounting hole 8. The screw 12 passes through the through hole 11 of the rear cross bar 5 and is locked into the mounting hole 8, so that the seat 1 can be directly fixed on the rear cross bar 5, which makes the operation simpler and more convenient.

[0046] Embodiment 3: This embodiment differs from Embodiment 1 in that the connecting piece is omitted and the cross bar is clipped into the positioning groove.

[0047] like Fig. 9As shown, the cross sections of the front and rear cross bars 4 and 5 are circular, the positioning grooves matched with the rear cross bar 5 are arc grooves larger than a semicircle, and the notch width of the rear positioning groove 10a matched with the rear cross bar 5 is smaller than the diameter of the rear cross bar 5. After the position of the seat 1 is adjusted, the seat 1 is pressed down to deform the notch, so that the rear cross bar 5 is inserted into the corresponding rear positioning groove 10a. Since the notch width is smaller than the diameter of the rear cross bar 5, the rear cross bar 5 will not easily fall out when subjected to external force, and the arc groove provides a larger contact area, so that the rear cross bar 5 can evenly distribute the pressure when subjected to force. The seat 1 is locked on the rear cross bar without a connector and the cross section of the rear cross bar 5 is circular. Such a design not only allows the seat to rotate and fold, but also allows the seat to be folded up when the chair is idle, saving space, and also saves costs because no connectors are used.

[0048] The above three embodiments all realize that the seat depth can be adjusted. The specific effect of the seat depth adjustment is as follows: Figure 2-5 . Figure 2 The rear cross bar 5 is placed when the seat of the chair in the first embodiment is positioned backward. Figure 3 This is a schematic diagram of the three-dimensional structure corresponding to when the seat of Example 1 is positioned backward, and the distance from the front of the seat back to the front of the seat is L1; as can be seen from the above, when the seat is positioned forward, the distance from the front of the seat back to the front of the seat is L2; ​​the two distances differ by 10-12mm, which shows that providing multiple positioning grooves can produce multiple seat depths, which can adapt to the choices of more people.

[0049] Furthermore, if Figure 1-7 A multi-purpose chair includes a chair back 6 and a seat depth adjustment mechanism as described above, which can adjust the seat depth to suit people of different weights. Specifically, the seat depth adjustment mechanism is mainly arranged by placing the rear cross bar 5 in different positioning slots of the rear positioning slot group 10, and the front cross bar 4 is correspondingly placed in the front positioning slot 9a. A connector can be used, such as in Example 1 and Example 2, to fix the seat 1 on the rear cross bar 5 to enhance the stability of the seat; or the cross bar can be directly inserted into the positioning slot, such as in Example 3, so that the operation is simple, the seat can be rotated and folded, and the cost can be saved.

[0050] 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 mechanism, comprising a seat and front legs and rear legs, the front legs and rear legs are respectively arranged in pairs on the left and right, a front cross bar is connected between the two front legs, a rear cross bar is connected between the two rear legs, the seat is placed on the front cross bar and the rear cross bar, and two front and rear positioning groove groups are recessed on the bottom surface of the seat, each positioning groove group includes a plurality of positioning grooves arranged in parallel at intervals, and both ends of the positioning grooves are connected to the side of the seat, the positioning grooves are arranged along the width direction of the seat, and after the front and rear positions of the seat are adjusted, the front cross bar and the rear cross bar are placed in the positioning grooves at corresponding positions.

2. The seat depth adjustment mechanism according to claim 1, characterized in that: At least the bottom surface of the seat and the rear cross bar are tied together by a connecting piece to prevent them from detaching after they are overlapped. The bottom surface of the seat is preset with multiple mounting holes near the rear cross bar. The mounting holes are arranged along the front-to-back direction. After the seat is moved forward and backward to adjust the seat depth, the connecting piece is connected to the corresponding mounting hole to fix it.

3. The seat depth adjustment mechanism according to claim 2, characterized in that: The connecting part includes a bridge part and a screw. A nut is embedded in the mounting hole. Both ends of the bridge part are preset with through holes. The bridge part spans the rear cross bar in the front-to-back direction and the through holes are aligned with the corresponding mounting holes. The screws are then locked in to connect and fix the bridge part to the bottom surface of the seat.

4. The seat depth adjustment mechanism according to claim 3, characterized in that: The cross section of the rear cross bar is square or circular. The bridging member includes a middle portion and a connecting portion integrally formed with the middle portion. The through hole is arranged on the connecting portion. The shape of the middle portion is square or semicircular. After the middle portion presses the rear cross bar into the positioning groove on the bottom surface of the seat, the through hole is aligned with the corresponding mounting hole.

5. The seat depth adjustment mechanism according to claim 1, characterized in that: At least the bottom surface of the seat and the rear cross bar are tied together by a connecting piece after they are overlapped to prevent them from detaching. The bottom of the seat is preset with multiple threaded mounting holes at the bottom of the positioning groove that cooperates with the rear cross bar; the connecting piece is a screw, and a through hole is provided on the rear cross bar in the radial direction. A nut is embedded in the mounting hole. The screw passes through the through hole of the rear cross bar and is locked into the mounting hole to fix the rear cross bar and the seat together.

6. The seat depth adjustment mechanism according to claim 1, characterized in that: The cross sections of the front and rear cross bars are circular, the positioning grooves cooperating with the rear cross bar are arc-shaped grooves larger than a semicircle, and the slot width of the positioning grooves cooperating with the rear cross bar is smaller than the diameter of the rear cross bar. The slots are deformed when the seat is pressed down, so that the rear cross bar is not easy to come out after being stuck in the corresponding positioning grooves.

7. The seat depth adjustment mechanism according to claim 6, characterized in that: The positioning groove matched with the front cross bar is a semicircular groove.

8. The seat depth adjustment mechanism according to claim 1, characterized in that: Each positioning groove group includes 2-4 positioning grooves arranged in parallel with front and rear intervals.

9. A multi-purpose seat, 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 8.

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