Swivel chair base with independent backrest pitching mechanism

Abstract

The utility model belongs to the technical field of seat parts, and particularly relates to a swivel chair base with an independent backrest pitching mechanism, which comprises a base support, a sleeve clamping seat is arranged at the center of the bottom of the base support, a rotating shaft support is arranged on the base support corresponding to the rear side of the sleeve clamping seat, and a horizontal fulcrum shaft is rotatably connected in series on the rotating shaft support. A chair back connecting arm is connected to the horizontal fulcrum shaft in series, a pitching tension adjusting knob is installed on the rear side, corresponding to the horizontal fulcrum shaft, of the chair back connecting arm, and the rear end of the chair back connecting arm protrudes out of the tail of the base support and is provided with a plurality of butt joint holes in a penetrating mode. The swivel chair base provided by the utility model is provided with the chair back pitching mechanism independent of the seat cushion, the seat cushion is not linked to move, the structure is simple, the precision requirement on the processing shape of the base part is lower, the included angle between the seat cushion and the backrest can be adjusted as required, and the use experience is more comfortable.

Description

TECHNICAL FIELD

[0001] The utility model relates to chair part technical field, specifically, it relates to the swivel chair base with independent backrest pitching mechanism. BACKGROUND

[0002] The seat is the daily life office necessity, the current common seat mostly contains the cushion lifting function and the backrest tilting function, wherein the cushion and the backrest are connected with the base pan of the seat, and the lifting of the cushion and the tilting of the backrest are all controlled by the base pan of the seat. The current common base pan structure includes: a base for connecting the cylinder lifting shaft, and a mounting frame for connecting the backrest and the cushion. The lifting of the cushion is realized by the lifting of the base, and the tilting of the backrest is realized by the rotation of the mounting frame. After the user tilts the backrest, the user wants to keep the current state, so the rotation locking device of the mounting frame needs to be set. The lifting control device of the base and the rotation locking device of the mounting frame are usually arranged in the base.

[0003] The traditional seat base structure with lifting and tilting functions on the market is shown in the patent document with the patent number CN200920313676.0 and the name "double locking chair tray", which includes a base pan mounted on a swivel chair, the base pan is connected with a shell through a support shaft, the shell is provided with an adjusting nut, the lower end of the adjusting nut is connected with a spring, the shell is provided with a movable seat, the movable seat is inserted with a conical pipe, and the conical pipe and the movable seat are connected with a conical fixed plate. The sidewall of the base pan and the shell is connected with a rotatable and axially movable adjusting rod, the inner end of the adjusting rod is inserted into the movable seat and connected with an adjusting plate which can contact the air pressure rod. The rod body of the adjusting rod is connected with a limiting piece, one end of the limiting piece is connected with a locking piece which can be buckled on the edge of the sidewall of the base pan.

[0004] However, the above tray uses the support shaft to connect the shell, and the shell is arranged to realize the tilting function of the seat. The shape processing precision of the shell is relatively high. Once the shell has a machining size deviation or stress deformation, the support shaft is prone to have poor rotation and abnormal noise, the position of the cushion is prone to deviate, and the quality of the product is difficult to guarantee. In addition, since the tilting function is linked to the cushion, the angle between the backrest and the cushion of the seat cannot be adjusted. The user needs to maintain a posture for a long time when sitting on the seat, which is easy to cause fatigue, and the backrest cannot be tilted backward for rest. UTILITY MODEL CONTENTS

[0005] In order to solve the problems that the conventional seat base tray structure with tilting function has high accuracy requirement for the shape of the parts, once there is a machining size deviation or stress deformation, the support shaft is prone to have poor rotation and abnormal noise, the position of the cushion is prone to deviate, and the angle between the backrest and the cushion of the seat cannot be adjusted, and the comfort is poor, the swivel chair base with independent backrest pitching mechanism is provided.

[0006] The swivel chair base with independent backrest tilting mechanism comprises a base support, a sleeve card seat is arranged at the center of the bottom of the base support, a rotating shaft support is arranged on the rear side of the base support corresponding to the sleeve card seat, a horizontal support shaft is rotatably connected to the rotating shaft support, a backrest connecting arm is connected to the horizontal support shaft, a tilting tension adjusting knob is arranged on the rear side of the horizontal support shaft corresponding to the backrest connecting arm, and a plurality of docking holes are arranged on the rear end of the backrest connecting arm protruding from the tail of the base support.

[0007] Further, the rotating shaft support comprises two vertically symmetrical vertical blocking pieces, a rotating shaft through hole is arranged on the vertical blocking piece, and the two ends of the horizontal support shaft are rotatably sleeved in the rotating shaft through holes on the left and right sides.

[0008] Further, the front end of the backrest connecting arm is provided with a positioning groove, the inner side width of the positioning groove is equal to the distance between the left and right vertical blocking pieces, the positioning groove is abutted and docked with the side surface of the vertical blocking piece, and the two ends of the horizontal support shaft are fixedly connected with the positioning groove.

[0009] Further, a weight-reducing emptying port is arranged at the bottom of the positioning groove.

[0010] Further, a soft gasket is connected between the side surface of the vertical blocking piece and the positioning groove on the horizontal support shaft.

[0011] Further, the tilting tension adjusting knob comprises a supporting shaft, a tension spring and a knob part, the top end of the supporting shaft penetrates through the backrest connecting arm and is fixedly connected with the base support, the bottom end of the supporting shaft is threadedly sleeved with the knob part, and the tension spring is connected in the supporting shaft and abuts against the bottom of the backrest connecting arm and the inner side of the knob part at two ends.

[0012] Further, a pull-out locking rod is arranged on the lower side of the backrest connecting arm between the horizontal support shaft and the tilting tension adjusting knob, the pull-out locking rod is movably sleeved on a hanging bracket, and the top of the hanging bracket is fixedly connected with the base support.

[0013] Further, a lifting shifting rod is connected to the inner side of the sleeve card seat, and the outer side of one end of the lifting shifting rod is the same as the direction of the pull-out locking rod.

[0014] Further, an operation handle is arranged on the outer side of one end of the pull-out locking rod and the lifting shifting rod.

[0015] Further, a cushion mounting hole is arranged on each corner point of the base support.

[0016] The advantages of the utility model lie in:

[0017] 1, utilize independent sleeve card seat rotating shaft support docking chair back connecting arm, cushion fixed docking base support does not participate in tilting movement, the component machining positioning precision requirement of rotating shaft support and other components is lower, and it is not easy to appear abnormal reaction such as abnormal sound and cushion deviation.

[0018] 2、The included angle between the seat cushion and the chair back can be adjusted as needed and can be locked, the user is comfortable, and the experience is good.

[0019] 3、The structure is simple, the material cost is low, and the installation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Fig. 1 It is a structure diagram of the bottom of the swivel chair base with independent backrest tilting mechanism.

[0022] Fig. 2 It is a bottom structure diagram of the swivel chair base with independent backrest tilting mechanism.

[0023] Fig. 3 It is a side structure diagram of the swivel chair base with independent backrest tilting mechanism connected with the chair back and the seat cushion.

[0024] Fig. 4 It is a perspective structure diagram of the tilting tension adjusting knob.

[0025] DRAWINGS:

[0026] 1, base support; 101, seat cushion mounting hole; 2, sleeve clamp seat; 201, lifting lever; 3, vertical stop sheet; 4, horizontal support shaft; 5, chair back connecting arm; 501, butt joint hole; 502, positioning groove; 503, weight reduction avoidance port; 6, tilting tension adjusting knob; 601, support shaft; 602, tension spring; 603, knob part; 7, soft gasket; 8, pull-out locking rod; 801, hanger; 9, operation handle; 10, chair back; 11, seat cushion. DETAILED DESCRIPTION

[0027] In order to solve the problem that the conventional seat base tray structure with tilting function has high accuracy requirement for the shape of parts, once there is machining size deviation or stress deformation, the shaft rotation is not smooth, the seat cushion position is deviated, and the like, the included angle between the seat cushion and the chair back is fixed and cannot be adjusted, and the comfort is poor, the swivel chair base with independent backrest tilting mechanism is provided.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] It should be noted that the terms such as "inner", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of implementation of this utility model, as stated above.

[0030] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.

[0031] like Figs. 1 to 4 As shown, this embodiment provides a swivel chair base with an independent backrest tilt mechanism, including a base bracket 1. A sleeve seat 2 is provided at the bottom center of the base bracket 1. A rotating shaft bracket is provided on the base bracket 1 corresponding to the rear side of the sleeve seat 2. A horizontal support shaft 4 is rotatably connected to the rotating shaft bracket. A chair back connecting arm 5 is connected to the horizontal support shaft 4. A tilt tension adjustment knob 6 is installed on the rear side of the chair back connecting arm 5 corresponding to the rear side of the horizontal support shaft 4. The rear end of the chair back connecting arm 5 protrudes from the tail of the base bracket 1 and is provided with multiple docking holes 501.

[0032] Wherein, since the rotating shaft support is independent of the base support 1 and the sleeve holder 2, its machining positioning accuracy requirement is lower, and it is not easy to cause abnormal reaction such as abnormal sound and cushion 11 deviation when the user sits due to the installation and cooperation deviation of the horizontal support shaft 4 and other components. In addition, the angle between the cushion 11 and the backrest 10 can be adjusted by the cooperation of the backrest connecting arm 5 and the pitch tension adjusting knob 6. The user can relax the pitch tension adjusting knob 6 when resting, so that the backrest 10 can be inclined backward, and the angle between the backrest 10 and the cushion 11 is increased, which is convenient for lying. The pre-set butt joint hole 501 facilitates the connection of various backrest components by bolts.

[0033] The rotating shaft support includes two left and right symmetrical vertical blocking pieces 3, and rotating shaft through holes (not marked in the figure) are formed in the vertical blocking pieces 3, and the two ends of the horizontal support shaft 4 are respectively rotatably sleeved in the rotating shaft through holes on the left and right sides. The rotating shaft support structure composed of the vertical blocking pieces 3 is simple and effective, and the vertical blocking pieces 3 can be made by the process of being vertically folded after being slotted on the base support 1, so that the structure strength is higher and the processing cost is lower.

[0034] The front end of the backrest connecting arm 5 is provided with a positioning groove 502, the inner width of the positioning groove 502 is equal to the distance between the left and right vertical blocking pieces 3, the positioning groove 502 is abutted and connected to the side surface of the vertical blocking piece 3, and the two ends of the horizontal support shaft 4 are fixedly connected with the positioning groove 502. The width of the positioning groove 502 corresponds to the vertical blocking piece 3, which facilitates the workers to quickly assemble and position. The horizontal support shaft 4 fixed on the positioning groove 502 can avoid the horizontal support shaft 4 from slipping and idling to cause the pitch linkage to fail to work normally.

[0035] The bottom of the positioning groove 502 is provided with a weight-reducing and air-avoiding opening 503. The weight-reducing and air-avoiding opening 503 can reduce the weight of the backrest connecting arm 5, and facilitate workers to assemble the horizontal support shaft 4 and maintain and adjust through the opening.

[0036] The horizontal support shaft 4 is connected with the soft gasket 7 between the side surface corresponding to the vertical blocking piece 3 and the positioning groove 502. The soft gasket 7 can improve the rotation smoothness of the horizontal support shaft 4, and avoid hard contact between the side surface of the vertical blocking piece 3 and the positioning groove 502 to generate friction noise and abrasion deformation.

[0037] The pitch tension adjusting knob 6 comprises a supporting shaft 601, a tension spring 602 and a knob 603, the top end of the supporting shaft 601 penetrates through the chair back connecting arm 5 and is fixedly connected to the base support 1, the bottom end of the supporting shaft 601 is threadedly sleeved with the knob 603, and the tension spring 602 is connected in series in the supporting shaft 601 and abuts against the bottom of the chair back connecting arm 5 and the inner side of the knob 603 at two ends respectively. The supporting shaft 601 ensures the stable connection of the tension spring 602 and the knob 603, and the knob 603 is moved up and down along the supporting shaft 601 by rotating the knob 603, so that the tension spring 602 is compressed and loosened, thereby adjusting the pitch tension of the chair back connecting arm 5. Specifically, the included angle between the chair back 10 and the cushion 11 will become smaller after the spring is compressed.

[0038] The lower side of the chair back connecting arm 5 between the horizontal supporting shaft 4 and the pitch tension adjusting knob 6 is provided with a pull-out locking rod 8, the pull-out locking rod 8 is movably sleeved on a hanger 801, and the top of the hanger 801 is fixedly connected to the base support 1. The pull-out locking rod 8 is inserted forward and can be clamped with the base support 1 to clamp the chair back connecting arm 5, so as to lock the chair back 10 when the pitch is not needed, thereby reducing the load of the tension spring 602.

[0039] The inner side of the sleeve clamping seat 2 is connected with a lifting lever 201 in the middle, and the outer side of one end of the lifting lever 201 is in the same direction as the pull-out locking rod 8. The pull-out locking rod 8 and the lifting lever 201 in the same direction facilitate the user to adjust with one hand.

[0040] The outer side of one end of the pull-out locking rod 8 and the lifting lever 201 is provided with an operation handle 9. The operation handle 9 facilitates the user to hold the pull-out locking rod 8 or the lifting lever 201 to operate, which can improve the use comfort.

[0041] The base support 1 is provided with a cushion mounting hole 101 at each of the four corner points. The four-corner layout of the cushion mounting hole 101 can ensure the connection stability between the base support 1 and the cushion 11, and avoid loosening and deviation.

[0042] In actual use, the swivel chair commonly used foot with a lifting rod is sleeved in the sleeve clamping seat 2, the cushion 11 is connected on the base support 1, and the chair back 10 is mounted through the butt joint hole 501 on the chair back connecting arm 5, so that the assembly of the swivel chair is completed, and the operation is convenient.

[0043] The above is a further detailed description of the present application in combination with the specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions, that is, any equivalent changes and modifications made within the scope of the present application shall still fall within the scope of the present application.

Claims

1. A swivel chair base with an independent backrest pitch mechanism, characterized in that The base support is provided with a sleeve holder at the center of the bottom, and a rotating shaft support is arranged at the rear side of the base support corresponding to the sleeve holder.

2. The swivel chair base with independent backrest pitch mechanism according to claim 1, characterized in that, The rotating shaft support comprises two vertically symmetrical vertical blocking pieces, and a rotating shaft through hole is arranged on each vertical blocking piece.

3. The swivel chair base with independent backrest pitch mechanism according to claim 2, characterized in that, The front end of the chair back connecting arm is provided with a positioning groove, the inner side width of the positioning groove is equal to the distance between the two vertical blocking pieces, the positioning groove is connected to the side surface of the vertical blocking piece, and the two ends of the horizontal support shaft are fixedly connected with the positioning groove.

4. The swivel chair base with independent backrest pitch mechanism according to claim 3, characterized in that, The bottom of the positioning groove is provided with a weight-reducing and air-avoiding opening.

5. The swivel chair base with independent backrest pitch mechanism according to claim 3, characterized in that, A soft gasket is arranged between the side surface of the vertical blocking piece and the positioning groove on the horizontal support shaft.

6. The swivel chair base with independent backrest pitch mechanism according to claim 1, characterized in that, The pitch tension adjusting knob comprises a supporting shaft, a tension spring and a knob part, the top end of the supporting shaft penetrates through the chair back connecting arm and is fixedly connected with the base support, the bottom end of the supporting shaft is threadedly connected with the knob part, and the tension spring is arranged in the supporting shaft and abuts against the bottom of the chair back connecting arm and the inner side of the knob part.

7. The swivel chair base with independent backrest pitch mechanism according to claim 1, characterized in that, The lower side of the chair back connecting arm between the horizontal support shaft and the pitch tension adjusting knob is provided with a pull-out locking rod, the pull-out locking rod is movably connected with a hanger, and the top of the hanger is fixedly connected with the base support.

8. The swivel chair base with independent backrest pitch mechanism according to claim 7, characterized in that, The inner side middle part of the sleeve holder is connected with a lifting lever, and the outer side one end of the lifting lever is the same as the direction of the pull-out locking rod.

9. The swivel chair base with independent backrest pitch mechanism according to claim 8, characterized in that, The outer side one end of the pull-out locking rod and the lifting lever is provided with an operation handle.

10. The swivel chair base with independent backrest pitch mechanism according to claim 1, characterized in that, The base support is provided with a seat cushion mounting hole at each corner.

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