Simplified seat backrest adjusting structure

Abstract

The utility model discloses a simplified seat backrest adjusting structure which comprises a foot stool, a seat frame and a backrest, the backrest is installed on a backrest pipe, and the backrest pipe is movably connected with the tail portion of the seat frame through a joint mechanism. The joint mechanism is connected with a connecting rod; the connecting rod is connected with a rocking handle; the joint mechanism comprises a fixed arm, a movable arm and a control arm, the fixed arm is fixedly connected with the seat frame, and the movable arm is fixedly connected with the backrest pipe and pivoted with the fixed arm through a rotating shaft; the control arm is movably installed on the fixed arm through a shaft pin, the connecting rod is fixedly connected with the control arm, and the movable arm and the control arm are locked and positioned through meshing of a tooth-shaped structure. A tension spring is arranged between the control arm and the fixed arm, and the control arm is pulled to be meshed with the movable arm through the tension spring. Therefore, the angle can be adjusted by rotating the backrest only by controlling the driving control arm to unlock the movable arm through the handle. The number of related parts is small, the structure is simplified, the cost is saved, the weight is reduced, and installation and operation are more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a seat product technical field especially relates to a structure that can adjust and control the inclination angle of seat backrest. BACKGROUND

[0002] The seat is important furniture in people's life, work and study, and the traditional seat can only be used for sitting, and long time keeping a posture will produce uncomfortable feeling. For this reason, people invent the seat that can adjust the backrest angle, and the backrest can also be laid down as a deck chair for use, so as to facilitate the noon break. For example, the utility model discloses a seat backrest adjusting control structure in Chinese utility model patent CN202323356679.1, which directly connects the control piece with the handle, and the control piece and the movable connecting piece are directly pushed away from the engagement by pressing the handle, without the conversion action of other parts, so that the installation operation is more convenient. At the same time, only one guide hole is needed to guide the movement process of the control piece, which reduces the friction and makes the adjustment operation more smooth. However, the seat still has the following problems: the adjusting mechanism has many parts, the structure is complex, the weight is heavier, the cost is higher, and the assembly operation is more complicated. SUMMARY

[0003] The utility model provides a simplified seat backrest adjusting structure with simpler structure, fewer parts, lighter weight, lower cost and simpler assembly operation.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme: a simplified seat backrest adjusting structure, including a foot support, a seat frame and a backrest, the seat frame is installed on the foot support, the backrest is installed on the backrest pipe, and the backrest pipe is movably connected with the tail of the seat frame through a joint mechanism; the joint mechanism is connected with a connecting rod, and the connecting rod is connected with a rocking handle; the joint mechanism includes a fixed arm, a movable arm and a control arm, the fixed arm is connected with the seat frame, the movable arm is connected with the backrest pipe, and the movable arm is pivotally connected with the fixed arm through a rotating shaft; the control arm is movably installed on the fixed arm through a shaft pin to form a rotatable structure, the connecting rod is connected with the control arm, and the movable arm and the control arm are locked and positioned through the engagement of the toothed structure; a tension spring is arranged between the control arm and the fixed arm, and the control arm and the movable arm are engaged through the tension spring.

[0005] Further, the toothed structure includes a plurality of adjusting teeth arranged on the movable arm and at least one positioning tooth arranged on the control arm, preferably four adjusting teeth, and the positioning tooth includes one, forming a four-grade adjusting structure of the backrest. The control arm and the movable arm are engaged by the positioning tooth clamped into any adjusting tooth.

[0006] Further, the joint mechanism further includes a joint shell, and the fixed arm, the movable arm, the control arm and the tension spring are covered inside the joint shell.

[0007] Further, the connecting rod is arranged below the joint mechanism, and the control arm is connected and fixed with the connecting rod from the joint shell.

[0008] Further, the handle is mounted at one end of the connecting rod and protrudes from one side of the seat frame to form a control structure for unlocking the joint by pushing upward.

[0009] The utility model only needs to control the driving control arm to release the locking of the movable arm through the handle, so that the backrest can be rotated to adjust the angle. After the handle is released, the movable arm can be driven to engage the movable arm again under the action of the tension spring, so that the positioning of the backrest is realized. The whole control structure involves few parts, simplifies the structure, saves the cost, reduces the weight, and makes the installation operation more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the overall structure diagram of the seat of the utility model;

[0011] Figure 2 It is the overall structure diagram of the seat of the utility model from another angle;

[0012] Figure 3 It is the assembly structure diagram of the joint mechanism, the seat frame and the backrest tube of the utility model;

[0013] Figure 4 It is the assembly structure diagram of the joint mechanism, the seat frame and the backrest tube of the utility model;

[0014] In the drawing, 1 is a foot stool, 2 is a seat cushion, 21 is a seat frame, 3 is a backrest, 31 is a backrest tube, 4 is a joint mechanism, 41 is a joint shell, 42 is a fixed arm, 43 is a movable arm, 44 is a control arm, 45 is a tension spring, 5 is a handle, and 6 is a connecting rod. DETAILED DESCRIPTION

[0015] In the embodiment, reference is made to Figures 1-4The simplified seat backrest adjusting structure comprises a foot support 1, a seat support 21 and a backrest 3, the seat support 21 is installed on the foot support 1 for installing a seat cushion 2 (or a seat plate), the backrest 3 is installed on a backrest tube 31, the backrest tube 31 is movably connected with the tail of the seat support 21 through a joint mechanism 4, the joint mechanism 4 is connected with a connecting rod 6, the connecting rod 4 is connected with a rocking handle 5, the joint mechanism 4 comprises a fixed arm 42, a movable arm 43 and a control arm 44, the fixed arm 42 is fixedly connected with the seat support 21, the movable arm 43 is fixedly connected with the backrest tube 21 and is pivoted with the fixed arm 42 through a rotating shaft, and can rotate around the rotating shaft relative to the fixed arm 42, the control arm 44 is movably installed on the fixed arm 42 through a shaft pin to form a rotatable structure, the connecting rod 6 is fixedly connected with the control arm 44, and the movable arm 43 and the control arm 44 are locked and positioned through the engagement of the toothed structure, and a tension spring 45 is arranged between the control arm 44 and the fixed arm 42, in the case that the rocking handle is loosened, the control arm 44 is pulled to engage with the movable arm 43 through the tension spring 45, so that the backrest 3 is kept fixed.

[0016] The toothed structure comprises a plurality of adjusting teeth arranged on the movable arm 43 and at least one positioning tooth arranged on the control arm 44, the engagement of the positioning tooth into any adjusting tooth realizes the engagement of the control arm 44 and the movable arm 43.

[0017] The adjusting teeth comprise four, and the positioning tooth comprises one, so as to form a four-gear adjusting structure of the backrest 3. Of course, a larger number of adjusting teeth can be arranged to realize more fine adjustment of the backrest 3.

[0018] The joint mechanism 4 further comprises a joint shell 41, the fixed arm 42, the movable arm 43, the control arm 44 and the tension spring 45 are covered inside the joint shell 41.

[0019] The connecting rod 6 is arranged below the joint mechanism 4, and the control arm 44 is connected and fixed with the connecting rod 6 by penetrating out of the joint shell 41.

[0020] The rocking handle 5 is installed at one end of the connecting rod 6 and protrudes from one side of the seat support 21 to form a control structure for unlocking the joint by pulling upward. Pulling the rocking handle 5 upward will pull the connecting rod 6, the connecting rod 6 drives the control arm 44 to rotate, so that the positioning tooth of the control arm 44 is disengaged from the adjusting tooth of the movable arm 43, at this time, the backrest 3 can be adjusted in rotation. After adjusting in place, the rocking handle 5 is loosened, the control arm 44 is reset by the tension spring 45, so that the positioning tooth of the control arm 44 is engaged with the corresponding adjusting tooth of the movable arm 43, that is, the positioning of the backrest 3 is realized.

[0021] The utility model is especially suitable for being used in schools as student seats, and is used for providing comfortable lunch break environment for students after the backrest is laid down.

[0022] The utility model has made a detailed description, the above-mentioned, only for the preferred embodiment of the utility model, when cannot limit the utility model implementation range, namely all equal changes and modification that make in the application scope, should still belong to the utility model cover range.

Claims

1. A simplified seat backrest adjustment structure, comprising a footrest, a seat frame, and a backrest, wherein the seat frame is mounted on the footrest, the backrest is mounted on a backrest tube, and the backrest tube is movably connected to the rear of the seat frame via a joint mechanism; the joint mechanism is connected to a connecting rod, and the connecting rod is connected to a crank handle, characterized in that: The joint mechanism comprises a fixed arm, a movable arm and a control arm, the fixed arm is fixedly connected with the seat frame, the movable arm is fixedly connected with the backrest tube and is pivotally connected with the fixed arm through a rotating shaft, the control arm is movably installed on the fixed arm through a shaft pin to form a rotatable structure, a connecting rod is fixedly connected with the control arm, the movable arm and the control arm are locked and positioned through the engagement of the toothed structure, a tension spring is arranged between the control arm and the fixed arm, and the control arm and the movable arm are engaged through the tension spring.

2. The simplified seat backrest adjustment structure according to claim 1, characterized by: The toothed structure comprises a plurality of adjusting teeth arranged on the movable arm and at least one positioning tooth arranged on the control arm, and the engagement of the control arm and the movable arm is realized by clamping the positioning tooth into any adjusting tooth.

3. The simplified seat backrest adjustment structure according to claim 2, characterized by: The adjusting teeth comprise four adjusting teeth, and the positioning tooth comprises one positioning tooth, so as to form a four-gear adjusting structure of the backrest.

4. The simplified seat backrest adjustment structure according to claim 1, characterized by: The joint mechanism further comprises a joint shell, and the fixed arm, the movable arm, the control arm and the tension spring are covered inside the joint shell.

5. The simplified seat backrest adjustment structure according to claim 4, characterized by: The connecting rod is arranged below the joint mechanism, and the control arm is connected and fixed with the connecting rod and protrudes from the joint shell.

6. The simplified seat backrest adjustment structure according to claim 1, characterized by: The handle is installed at one end of the connecting rod and protrudes from one side of the seat frame to form a control structure for unlocking the joint by pulling upward.

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