Table chair capable of steplessly adjusting reclining angle of backrest

Abstract

The utility model provides a tablet chair capable of adjusting the reclining angle of a backrest in a stepless mode. The tablet chair comprises a seat plate pipe frame, a backrest pipe frame and an adjusting mechanism. A positioning piece is arranged at the bottom of the backrest pipe frame; the bottom end of the positioning piece is in threaded connection with an adjusting bolt; the adjusting mechanism comprises a fixing plate and an operating rod, and the fixing plate is provided with a sitting posture stop pin and a reclining stop wall; the front end of the operating rod is rotationally connected to the fixed plate, and a tension spring is arranged between the operating rod and the fixed plate; in the sitting posture state, the positioning piece is limited between the middle of the operating rod and the sitting posture stop pin in the front-back direction; when the operating rod rotates downwards, the tension spring is stretched to provide upward rotating acting force for the operating rod, the middle of the operating rod moves away from the front side of the positioning piece to release limiting of the positioning piece, the backrest pipe frame rotates backwards to be in a reclining state, and one end of the adjusting bolt abuts against the reclining retaining wall. The stepless adjustment of the reclining angle can be realized by rotating the adjusting bolt; and the operating rod is rotated downwards, so that the backrest pipe frame can be unlocked in the sitting posture state, and the state adjustment is convenient and quick.

Description

Technical Field

[0001] This utility model relates to the field of school chairs, and in particular to a school chair with a stepless adjustable backrest reclining angle. Background Technology

[0002] To facilitate students' lunch break, the chair backs are designed with an adjustable structure. In normal use, the backrest is upright or slightly tilted to help students maintain good posture. During lunch break, the backrest is tilted back at a larger angle so students can recline and achieve a better rest. In existing technology, the chair backrest can only be adjusted to a fixed angle in the reclining position for lunch break; it cannot be adjusted vertically to suit different students' reclining angles, making it inconvenient to use. Furthermore, the current technology involves a cumbersome backrest switching process, a complex structure, and is inconvenient to use. Utility Model Content

[0003] This utility model provides a school chair with stepless adjustment of the backrest reclining angle, which makes it convenient to adjust the backrest reclining angle and allows for quick and easy switching between states.

[0004] This utility model provides a chair with stepless adjustable backrest reclining angle, including a seat frame, a backrest frame and an adjustment mechanism;

[0005] The backrest tube frame is rotatably connected to the top rear side of the seat plate tube frame, and a positioning component is provided at its bottom. An adjusting bolt is threaded to the bottom end of the positioning component.

[0006] The adjustment mechanism includes a fixed plate and a control lever. The fixed plate is fixed to the seat frame and is provided with a sitting posture stop pin and a reclining wall. The front end of the control lever is rotatably connected to the fixed plate, and its rotation axis is parallel to the rotation axis of the backrest frame and both are in the left-right direction. A tension spring is provided between the control lever and the fixed plate.

[0007] When the backrest frame is in a seated position, the positioning member is positioned in the front-to-back direction between the middle of the control lever and the seated stop pin.

[0008] When the control lever is rotated downwards, the tension spring is stretched to provide an upward rotational force to the control lever. The middle part of the control lever moves away from the front side of the positioning member to release the limiting effect on the positioning member. The backrest tube frame rotates backwards to a reclining state. One end of the adjusting bolt abuts against the reclining retaining wall for stepless adjustment of the reclining angle of the backrest tube frame.

[0009] This utility model provides a stepless adjustable backrest reclining chair. By rotating the adjusting bolt, the distance between one end of the adjusting bolt and the positioning component is changed. When one end of the adjusting bolt abuts against the reclining barrier, the reclining angle of the backrest frame can be changed, achieving stepless adjustment of the backrest frame's reclining angle, making it convenient to use. To adjust the chair from a sitting position to a reclining position, simply turn the control lever downwards to release the backrest frame from the sitting position. The user can then flip the backrest frame backwards to adjust it to the reclining position. To return to the sitting position, the user flips the backrest frame forward. When the positioning component abuts against the sitting position stop pin, the control lever rotates upwards under the action of the tension spring, moving its middle part to the front end of the positioning component. This limits the positioning component between the middle of the control lever and the sitting position stop pin, thereby locking the backrest frame in the sitting position. The chair's position adjustment is convenient and quick, and the structure is simple. Attached Figure Description

[0010] Figure 1 A schematic diagram of the structure of the stepless adjustable backrest reclining angle school chair provided in the preferred embodiment of this utility model in a sitting posture;

[0011] Figure 2 yes Figure 1 A structural diagram of a middle-class chair in a reclining position;

[0012] Figure 3 yes Figure 1 A schematic diagram of the adjustment mechanism and positioning components of a middle-class chair in a seated position;

[0013] Figure 4 yes Figure 2 A schematic diagram of the adjustment mechanism and positioning components of a middle-class chair in a reclining position;

[0014] Figure 5 yes Figure 3 Exploded view of the central adjustment mechanism and positioning components;

[0015] Figure 6 yes Figure 3 An exploded view of the adjustment mechanism and positioning component from another angle. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] In the diagram, units with similar structures are represented by the same labels.

[0018] Please see Figure 1 and Figure 2 This utility model provides a chair with a steplessly adjustable backrest reclining angle, comprising a seat frame 1, a backrest frame 2, and an adjustment mechanism 3. The backrest frame 2 has a backrest mounting hole for mounting the backrest; the top of the seat frame 1 has a seat mounting hole for mounting the seat. The bottom of the backrest frame 2 is rotatably connected to the rear top of the seat frame 1. The adjustment mechanism 3 is connected between the backrest frame 2 and the seat frame 1 to adjust their position, allowing the backrest frame 2 to switch between a sitting and reclining position.

[0019] The backrest tube frame 2 is rotatably connected to the top rear side of the seat plate tube frame 1. A positioning part 21 is provided at its bottom. An adjusting bolt 22 is threadedly connected to the bottom end of the positioning part 21. The adjusting bolt 22 is used to realize stepless adjustment of the angle of the backrest tube frame 2 in the reclining state.

[0020] Combination Figure 3 and Figure 4 As shown, the adjustment mechanism 3 includes a fixed plate 31 and a control lever 32. The fixed plate 31 is fixed to the seat plate tube frame 1. The fixed plate 31 is provided with a sitting posture stop pin 311 and a reclining stop wall 312. The sitting posture stop pin 311 and the reclining stop wall 312 are used to position the backrest tube frame 2 in two states, respectively.

[0021] The front end of the control lever 32 is rotatably connected to the fixed plate 31, and its rotation axis is parallel to the rotation axis of the backrest tube frame 2 and both are in the left-right direction. A tension spring 33 is provided between the control lever 32 and the fixed plate 31, and the tension spring 33 is used to return the control lever 32 to its upward position after it moves down.

[0022] like Figure 3 As shown, when the backrest tube frame 2 is in a seated position, the positioning member 21 is positioned between the middle of the control lever 32 and the seated stop pin 311 in the front-back direction, so that the backrest tube frame 2 cannot rotate back and forth, thus reliably positioning itself in a seated position, which is convenient for students to use in class and study.

[0023] like Figure 4 As shown, when the control lever 32 is rotated downwards, the tension spring 33 is stretched, thereby providing an upward rotational force to the control lever 32. The middle part of the control lever 32 moves away from the front side of the positioning member 21 to release the restriction on the positioning member 21. The backrest chair rotates backwards to the reclining state. One end of the adjusting bolt 22 abuts against the reclining retaining wall 312 for stepless adjustment of the reclining angle of the backrest tube frame 2.

[0024] The tension spring 33 can exert an upward force on the control lever 32 by stretching and deforming, so as to facilitate the upward reset of the control lever 32. By rotating the adjusting bolt 22, the distance between one end of the adjusting bolt 22 and the positioning part 21 can be changed. When one end of the adjusting bolt 22 abuts against the inclined retaining wall 312, the inclined angle of the backrest tube frame 2 can be changed. The user can rotate the adjusting bolt 22 as needed to adjust the tilt angle of the backrest tube frame 2 to a suitable state, thereby realizing stepless adjustment of the inclined angle of the backrest tube frame 2, which is convenient to use.

[0025] To adjust the chair from a sitting position to a reclining position, simply turn the lever 32 downwards to release the lock on the backrest frame 2 in the sitting position. The user can then flip the backrest frame 2 backwards to adjust it to the reclining position. To return to the sitting position, the user flips the backrest frame 2 forwards. When the positioning member 21 abuts against the sitting position stop pin 311, the lever 32 rotates upwards under the action of the tension spring 33, moving its middle part to the front end of the positioning member 21. This limits the positioning member 21 between the middle part of the lever 32 and the sitting position stop pin 311, thereby locking the backrest frame 2 in the sitting position. The chair's position adjustment is convenient, quick, and has a simple structure.

[0026] like Figure 5 and Figure 6 As shown, the adjustment mechanism 3 also includes a foot pedal 34, which is located at the end of the control lever 32. The upper surface of the foot pedal 34 is marked with the word "step" or "step" to clearly indicate the operation method to the user. When the user steps on the foot pedal 34, the control lever 32 can be rotated downwards. The user can use their foot to operate the control lever 32 to unlock the backrest frame 2, while simultaneously rotating the backrest frame 2 with their hand, facilitating operation.

[0027] The foot pedal 34 can be made of plastic so that it can be injection molded, making it easy to form a conspicuous "step" or "step" mark on its surface. The foot pedal 34 can be provided with a plug hole (not shown in the figure). After the end of the control lever 32 is inserted into the plug hole, the two are fixed with screws to ensure a firm and reliable connection.

[0028] The positioning component 21 is plate-shaped and is arranged parallel to the fixing plate 31, with both perpendicular to the rotation axis of the backrest tube frame 2. One side of the fixing plate 31 is fixedly connected to the seat plate tube frame 1, and the other side is rotatably connected to the positioning component 21. Through the rotational engagement of the positioning component 21 and the fixing plate 31, the backrest tube frame 2 can be rotatably connected relative to the seat plate tube frame 1. This also facilitates the assembly and connection between the positioning component 21 and the fixing plate 31 and ensures the stability of their relative rotation.

[0029] A backrest rotating bushing 313 may be provided on the fixed plate 31, and a rotating hole 213 is provided on the positioning member 21. The backrest rotating bushing 313 passes through the rotating hole 213, so that the positioning member 21 can rotate relative to the fixed plate 31. Here, in other embodiments, other rotating structures may also be provided, as long as they enable the positioning member 21 to rotate relative to the fixed plate 31.

[0030] The sitting position stop pin 311 and the reclining stop wall 312 are both located on the other side of the fixing plate 31, so that they are on the same side of the fixing plate 31 as the positioning member 21, which facilitates the limiting of the positioning member 21.

[0031] like Figures 3 to 6 As shown, the positioning member 21 extends downward to form a positioning protrusion 211. The front and rear sides of the positioning protrusion 211 abut against the middle of the control lever 32 and the sitting position stop pin 311, respectively, so that the positioning member 21 can be reliably locked in the sitting position without shaking by the structure of the positioning protrusion 211 abutting against the sitting position stop pin 311 and the control lever 32.

[0032] A nut 212 is provided at the bottom of the positioning protrusion 211 on the side opposite to the fixed plate 31. The adjusting bolt 22 is threadedly connected to the nut 212 to achieve a threaded engagement between the positioning component 21 and the adjusting bolt 22. The nut 212 can be welded to the positioning protrusion 211 to improve the connection strength. The nut 212 can be a thick nut with an axial length greater than its outer diameter to improve the reliability of the threaded connection.

[0033] like Figure 4 and Figure 5 As shown, the inclined retaining wall 312 is vertically fixed to the fixing plate 31, and one end face of it is used to abut against one end of the adjusting bolt 22 to ensure the reliability of the two in the abutting state.

[0034] like Figures 3 to 6 As shown, a connecting plate 314 is also provided on the fixed plate 31. The connecting plate 314 is perpendicular to the fixed plate 31, and one end of the connecting plate 314 is connected to the other end of the inclined retaining wall 312, with the two intersecting to improve the overall structural strength. The connecting plate 314 is connected to one end of the tension spring 33 to facilitate the assembly of the tension spring 33. More specifically, as shown... Figure 5 and Figure 6 As shown, the connecting plate 314 is provided with a hanging hole 3140, and one end of the tension spring 33 is installed in the hanging hole 3140. The hanging hole 3140 has a simple structure and is easy to process and form. Of course, in other embodiments, the connecting plate 314 can also be bent to form a hook, and one end of the tension spring 33 can be installed in the hook.

[0035] like Figures 3 to 5As shown, the control lever 32 is plate-shaped and is set parallel to the fixed plate 31. The middle part of the control lever 32 is vertically bent into a step shape, and the tail end of the control lever 32 is lower than its front end, so as to facilitate the limiting cooperation between the middle part of the control lever 32 and the positioning protrusion 211, and to facilitate the processing and manufacturing of the control lever 32.

[0036] The positioning component 21, the fixing plate 31, and the operating lever 32 can all be metal sheet parts to facilitate processing and manufacturing.

[0037] like Figure 1 and Figure 2 As shown, the top of the seat plate support 1 is provided with two longitudinal tubes 11, which extend in the front-to-back direction. The positioning element 21 and the adjustment mechanism 3 are located between the rear ends of the two longitudinal tubes 11, so that each moving part is located between the two longitudinal tubes 11, avoiding external interference during the adjustment process. The seat plate mounting holes are provided on the two longitudinal tubes 11, so that the seat plate can be installed to the top surface of the longitudinal tubes 11 by screws.

[0038] In this embodiment, there are two adjustment mechanisms 3, respectively located on the left and right sides of the chair. There are also two positioning members 21, which respectively cooperate with the operating levers 32 of the two adjustment mechanisms 3. The two positioning members 21 can be fixed to the inner sides of the two longitudinal tubes 11.

[0039] A synchronizing rod 30 connects the two control levers 32 of the adjustment mechanism 3. When the user steps on either foot pedal 34, the two control levers 32 can rotate downward synchronously to facilitate unlocking the backrest.

[0040] The backrest support frame 2 includes two bent tubes 29, the bottom ends of which are fixedly connected to the top ends of two positioning members 21 respectively. The distance between the top ends of the two bent tubes 29 is smaller than the distance between their bottom ends, making the distance between the bottom ends of the two bent tubes 29 relatively large, which facilitates rotational engagement with the base plate support frame.

[0041] The top end of the bent tube 29 is open for mounting the headrest support. The headrest support can be easily inserted using the inner hole at the top end of the bent tube 29.

[0042] A horizontal pipe 23 connects the two bent pipes 29, so that the backrest pipe frame 2 is connected as a whole component, facilitating assembly or disassembly. Figure 1 As shown, a bottom tube 24 is connected between the two positioning parts 21 to ensure the stability of the two positioning parts 21 rotating at the same time.

[0043] The stepless adjustable reclining chair provided by this utility model, when in the sitting position, pressing the foot pedal 34 will rotate the control lever 32 downwards, disengaging the middle part of the control lever 32 from the positioning member 21, unlocking the backrest frame 2, allowing the backrest frame 2 to rotate backwards until the adjusting bolt 22 on the backrest frame 2 touches the reclining stop 312 on the fixing plate 31, thus shifting the chair to a reclining position for lunch break. In the reclining position, holding the backrest frame 2 and rotating it upwards to an upright or near-upright position, the positioning member 21 of the backrest frame 2 touches the sitting position stop pin 311, and simultaneously the control lever 32 rotates upwards under the action of the tension spring 33 until the middle part of the control lever abuts against the positioning protrusion 211, the backrest is in a sitting position, and the sitting position stop pin 311 and the middle part of the control lever lock the backrest frame 2 in the sitting position without wobbling.

[0044] By rotating the adjusting bolt 22, the position of the adjusting bolt 22 on the positioning part 21 can be changed, and the reclining angle of the chair back can be adjusted steplessly.

[0045] The end of the control lever 32 is equipped with a foot pedal 34, and the adjustment mechanism 3 has two sets, left and right. Stepping on either foot pedal 34 will unlock the backrest seating position. The upper surface of the foot pedal 34 has a conspicuous "step" or "step" character, which simply and clearly explains the unlocking method to the user, making it easy to operate.

[0046] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A school chair with a steplessly adjustable backrest reclining angle, characterized in that, Includes seat frame, backrest frame and adjustment mechanism; The backrest tube frame is rotatably connected to the top rear side of the seat plate tube frame, and a positioning component is provided at its bottom. An adjusting bolt is threaded to the bottom end of the positioning component. The adjustment mechanism includes a fixed plate and a control lever. The fixed plate is fixed to the seat frame and is provided with a sitting posture stop pin and a reclining wall. The front end of the control lever is rotatably connected to the fixed plate, and its rotation axis is parallel to the rotation axis of the backrest frame and both are in the left-right direction. A tension spring is provided between the control lever and the fixed plate. When the backrest frame is in a seated position, the positioning member is positioned in the front-to-back direction between the middle of the control lever and the seated stop pin. When the control lever is rotated downwards, the tension spring is stretched to provide an upward rotational force to the control lever. The middle part of the control lever moves away from the front side of the positioning member to release the limiting effect on the positioning member. The backrest tube frame rotates backwards to a reclining state. One end of the adjusting bolt abuts against the reclining retaining wall for stepless adjustment of the reclining angle of the backrest tube frame.

2. The chair with infinitely adjustable backrest reclining angle according to claim 1, characterized in that, The adjustment mechanism also includes a foot pedal, which is located at the end of the control lever, and the upper surface of the foot pedal is marked with the word "step" or "step".

3. The continuously adjustable backrest reclining angle school chair according to claim 1, characterized in that, The positioning element is plate-shaped and is arranged parallel to the fixing plate, and both are perpendicular to the rotation axis of the backrest tube frame; one side of the fixing plate is fixedly connected to the seat tube frame, and the other side is rotatably connected to the positioning element; the sitting posture stop pin and the reclining retaining wall are both arranged on the other side of the fixing plate.

4. The continuously adjustable backrest reclining angle school chair according to claim 3, characterized in that, The positioning element extends downward to form a positioning protrusion, and the front and rear sides of the positioning protrusion respectively abut against the middle of the control lever and the sitting position stop pin; a nut is provided at the bottom of the side of the positioning protrusion facing away from the fixed plate, and the adjusting bolt is threaded to the nut.

5. The continuously adjustable backrest reclining angle school chair according to claim 1, characterized in that, The inclined retaining wall is vertically fixed to the fixing plate, and one end face of the wall is used to abut against one end of the adjusting bolt.

6. The continuously adjustable backrest reclining angle school chair according to claim 5, characterized in that, The fixing plate is also provided with a connecting plate, which is perpendicular to the fixing plate. One end of the connecting plate is connected to the other end of the inclined retaining wall, and the two are intersecting. The connecting plate is connected to one end of the tension spring.

7. The continuously adjustable backrest reclining angle school chair according to claim 1, characterized in that, The control lever is plate-shaped and is set parallel to the fixed plate; the middle part of the control lever is vertically bent into a step shape, and the tail end of the control lever is lower than its front end.

8. The continuously adjustable backrest reclining angle of the school chair according to claim 1, characterized in that, The top of the seat plate tube frame is provided with two longitudinal tubes, which extend in the front-to-back direction. The positioning element and the adjustment mechanism are located between the rear ends of the two longitudinal tubes.

9. The continuously adjustable backrest reclining angle school chair according to any one of claims 1-8, characterized in that, There are two adjustment mechanisms, respectively located on the left and right sides of the chair; there are two positioning components, each cooperating with the control lever of one of the two adjustment mechanisms; a synchronization rod connects the two control levers.

10. The continuously adjustable backrest reclining angle school chair according to claim 9, characterized in that, The backrest support includes two bent tubes, the bottom ends of which are fixedly connected to the top ends of two positioning members respectively; the distance between the top ends of the two bent tubes is less than the distance between their bottom ends, and the top ends of the bent tubes are open for mounting the headrest support; a horizontal tube connects the two bent tubes.

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