Backrest adjusting structure of noon break chair

Abstract

The utility model discloses a noon break chair backrest adjusting structure which comprises a foot stool, a seat frame and a backrest, the seat frame is installed on the foot stool, the backrest is installed on a backrest pipe, the backrest pipe is connected with a rotating rod, and the two ends of the rotating rod are movably connected with the tail of the seat frame through joint mechanisms. The rotating rod is connected with an adjusting mechanism, the adjusting mechanism is connected with a rocker, and the rocker is connected with a rocking handle; the adjusting mechanism is connected to the middle part of the rotating rod and comprises an adjusting sheet and a positioning sheet, adjusting teeth are arranged on the adjusting sheet, and positioning teeth are arranged on the positioning sheet; the adjusting sheet and the rotating rod are assembled and fixed, and the positioning sheet is pivoted in a fixed seat; a pushing arm is hinged to the positioning piece and connected with the rocker. And a tension spring is connected between the positioning sheet and the fixed seat. Therefore, the two ends of the rotating rod are connected with the seat frame only through the joint mechanisms, adjustment control can be achieved only through one adjusting mechanism, parts are reduced, the structure is simplified, 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 not only be uncomfortable, but also will produce some related occupational diseases, such as lumbar hyperosteogeny etc. For this reason, people have invented the seat that can adjust the angle of backrest, and some can also put backrest down as a deck chair. The utility model discloses a seat backrest adjusting control structure in Chinese utility model patent CN202323356679.1, which is directly connected with the handle by the control piece, and the control piece and the movable connecting piece are directly pushed off the engagement by pressing the handle, without the conversion of other parts, which not only reduces the parts and weight, but also makes the installation operation 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 is arranged on both sides, although the handle is only in one place, but the other parts of the adjusting mechanism on both sides are needed to realize synchronous adjustment and positioning. This leads to more parts, more complex structure, more weight, higher cost and more complicated assembly operation. SUMMARY

[0003] The utility model provides a lunch break chair backrest adjusting structure that has simpler structure, more reasonable design, 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 lunch break chair backrest adjusting structure, including foot support, seat frame and backrest, the seat frame is installed on the foot support, the backrest is installed on the backrest pipe, the backrest pipe is connected with the rotating rod, and the two ends of the rotating rod are movably connected with the tail of the seat frame through the joint mechanism;The rotating rod is connected with the adjusting mechanism for adjusting the inclination angle of backrest, the adjusting mechanism is connected with the rocker, the rocker is connected with the rocking handle, characterized by: the adjusting mechanism is connected to the middle part of the rotating rod, and the rocking handle is stretched to one side through the rocker;The adjusting mechanism includes adjusting sheet and positioning sheet, the adjusting sheet is provided with adjusting teeth, and the positioning sheet is provided with positioning teeth;The adjusting sheet is assembled and fixed with the rotating rod, the positioning sheet is pivotally installed in a fixed seat through the rotating shaft, and the fixed seat is connected and fixed with the seat frame;The tail of the positioning sheet is hinged with the push arm, and the push arm is connected and fixed with the rocker;The positioning sheet and the fixed seat are connected with the tension spring, and the positioning sheet is pulled tight through the tension spring so that the positioning teeth and the adjusting teeth of the adjusting sheet are engaged with each other to realize the positioning of the backrest.

[0005] Further, the adjusting piece comprises a plurality of adjusting teeth, each adjusting tooth corresponding to an angle of a backrest gear position, and the adjusting teeth are arranged in an arc shape at the front end of the adjusting piece; the positioning piece comprises a positioning tooth, the positioning tooth protrudes forward at the top of the front end of the positioning piece, and the positioning tooth is used for clamping any adjusting tooth to position the backrest at the corresponding gear angle.

[0006] Further, the bottom of the front end of the positioning piece is pivotally installed in the fixed seat through the shaft seat on both sides and the rotating shaft, the lower end of the tension spring is connected to the upper end of the tail of the positioning piece, and the upper end of the tension spring is connected to the fixed seat, so that the tail of the positioning piece is pulled upward to tightly clamp the positioning tooth and the adjusting tooth of the adjusting piece.

[0007] Further, a fixed arm protruding rearward is arranged at the tail of the adjusting piece, the fixed arm is inserted into the rotating rod to assemble and fix the positioning piece and the rotating rod.

[0008] Further, auxiliary arms are arranged at the upper part and the lower part of the adjusting piece respectively, the inner side of the auxiliary arm is in a circular arc structure, and after the fixed arm is inserted into the rotating rod, the auxiliary arm is clamped on the circumferential surface of the rotating rod.

[0009] Further, a protective cover is arranged outside the adjusting mechanism, the entire adjusting mechanism is covered inside through the protective cover, and the rocker is worn out from one side of the protective cover.

[0010] Further, limiting pieces are arranged at both ends of the rotating rod respectively, the limiting pieces protrude outward by a sector part, the edge of the sector part is abutted against the seat frame to form the maximum range of backrest rotation adjustment, the front edge of the sector part of the limiting piece corresponds to the limit position of the forward adjustment of the backrest, and the rear edge corresponds to the limit position of the rear adjustment of the backrest.

[0011] The adjusting mechanism is arranged at the middle position of the tail of the seat, the rotation of the rotating rod is directly controlled to realize the adjustment and positioning of the backrest angle, only a set of adjusting mechanism is needed to realize the adjustment control, the adjusting mechanism only needs the adjusting piece with the adjusting tooth and the positioning piece with the positioning tooth to cooperate with the tension spring and the rocker to realize the control of the backrest adjustment, so that the parts are reduced, the structure is simplified, the cost is saved, the weight is reduced, and the installation operation is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a whole structure diagram of the seat of the utility model;

[0013] Figure 2 It is a whole structure diagram of another angle of the seat of the utility model;

[0014] Figure 3 It is a structure diagram of the seat of the utility model after the protective cover is removed;

[0015] Figure 4 Figure 2 is an assembly structure diagram of the backrest adjusting mechanism and the rocker;

[0016] Figure 5 Figure 3 is a structure diagram of the backrest adjusting mechanism after the fixed seat is removed.

[0017] In the figure, 1 is a foot support, 2 is a seat support, 3 is a backrest tube, 31 is a rotating rod, 32 is a limiting sheet, 4 is a joint mechanism, 5 is an adjusting mechanism, 50 is a fixed seat, 51 is an adjusting sheet, 52 is an adjusting tooth, 53 is a fixed arm, 54 is a positioning sheet, 55 is a positioning tooth, 56 is a shaft seat, 57 is a pushing arm, 58 is a tension spring, 59 is an auxiliary arm, 6 is a rocker, 61 is a rocking handle, and 7 is a protective cover. DETAILED DESCRIPTION

[0018] In this embodiment, referring to Figures 1-5 , the backrest adjusting structure of the noon break chair comprises a foot support 1, a seat support 2, and a backrest. The seat support 2 is installed on the foot support 1, and the backrest is installed on a backrest tube 3. The backrest tube 3 is connected with a rotating rod 31. The two ends of the rotating rod 31 are movably connected with the tail of the seat support 2 through a joint mechanism 4. The rotating rod 31 is connected with an adjusting mechanism 5 for adjusting the inclination angle of the backrest. The adjusting mechanism 5 is connected with a rocker 6, and the rocker 6 is connected with a rocking handle 61. The adjusting mechanism 5 is connected to the middle part of the rotating rod 31 so as to control both sides at the same time. The rocking handle 61 is extended to one side through the rocker 6 so as to be pressed by hand for adjustment. The adjusting mechanism 5 comprises an adjusting sheet 51 and a positioning sheet 54. The adjusting sheet 51 is provided with adjusting teeth 52, and the positioning sheet 54 is provided with a positioning tooth 55. The adjusting sheet 51 is assembled and fixed with the rotating rod 31. The positioning sheet 54 is pivotally assembled in a fixed seat 50 through a rotating shaft. The fixed seat 50 is fixedly connected with the seat support 2. The tail of the positioning sheet 54 is hingedly connected with a pushing arm 57. The pushing arm 57 is fixedly connected with the rocker 6. The positioning sheet 54 is connected with the fixed seat 50 through a tension spring 58. The positioning tooth 55 of the positioning sheet 54 is clamped with the adjusting tooth 52 of the adjusting sheet 51 through the tension spring 58, thereby realizing the positioning of the backrest and fixing the backrest.

[0019] The adjusting sheet 51 comprises a plurality of adjusting teeth 52, such as four adjusting teeth 52. Each adjusting tooth 52 corresponds to an angle of one gear position of the backrest, that is, four gear adjusting angles. The adjusting teeth 52 are arranged in an arc shape at the front end of the adjusting sheet 51, thereby forming an arc-shaped rack structure. The positioning sheet 54 comprises one positioning tooth 55. The positioning tooth 55 protrudes forward at the top of the front end of the positioning sheet 51. The positioning tooth 55 clamps any adjusting tooth 52, thereby positioning the backrest at the corresponding gear angle.

[0020] The front end bottom of the positioning sheet 51 is pivotally installed in the fixed seat 50 through the shaft seats 56 on both sides, the lower end of the tension spring 58 is connected to the upper end of the tail of the positioning sheet 54, and the upper end of the tension spring 58 is connected to the fixed seat 50, so that the tail of the positioning sheet 54 is pulled upward to make the positioning teeth 55 tightly clamped with the adjusting teeth 52 of the adjusting sheet 51.

[0021] The tail of the adjusting sheet 51 is provided with a fixed arm 53 extending rearward, the fixed arm 53 is inserted into the rotating rod 31 to assemble and fix the positioning sheet 51 with the rotating rod 31.

[0022] The upper part and the lower part of the adjusting sheet 51 are respectively provided with auxiliary arms 59, the inner side of the auxiliary arm 59 is in a circular arc structure, after the fixed arm 53 is inserted into the rotating rod 31, the auxiliary arm 59 is tightly clamped on the circumferential surface of the rotating rod 31 to play an auxiliary fixing role.

[0023] The adjusting mechanism 5 is externally provided with a protective cover 7, the whole adjusting mechanism 5 is covered inside through the protective cover 7, and the rocker 6 is worn out from one side of the protective cover 7. The rocker handle 61 is pressed, the driving arm 57 is driven to rotate downward through the rocker 6, the tail of the positioning sheet 54 is driven to rotate downward, the positioning teeth 55 are separated from the adjusting teeth 52, at this time, the backrest is in an unlocked state and can be rotated forward or backward to adjust the angle. After adjusting to the position, the rocker handle 61 is released, under the action of the tension of the tension spring 58, the tail of the positioning sheet 54 rotates upward, the positioning teeth 55 move forward to clamp the corresponding adjusting teeth 52, that is, the positioning of the backrest is realized.

[0024] The rotating rod 31 is respectively provided with limiting sheets 32 at both ends, the limiting sheets 32 outwardly extend a fan-shaped part, the edge of the fan-shaped part abuts against the seat frame 2 to form the maximum range of the backrest rotation adjustment. The front edge of the fan-shaped part of the limiting sheet 32 corresponds to the limit position of the forward adjustment of the backrest, and the rear edge corresponds to the limit position of the backward adjustment of the backrest. Through the abutment of the limiting sheet 32 and the seat frame 2, the structure strength and safety of the seat can also be avoided due to the fact that the positioning teeth 55 of the adjusting mechanism 5 are not clamped with the adjusting teeth 52, and the backrest is overturned.

[0025] The utility model is especially suitable for being used in schools as student seats, and can provide comfortable lunch break environment for students after the backrest is laid down.

[0026] The utility model has been described in detail, the above-mentioned, only for the better implementation example of the utility model, when cannot limit the utility model implementation range, namely all equal changes and modifications made according to the scope of this application should still belong to the utility model coverage.

Claims

1. A backrest adjustment structure for a nap chair, comprising a leg, a seat, and a backrest, wherein the seat is mounted on the leg, the backrest is mounted on a backrest tube, the backrest tube is connected to a rotating rod, and both ends of the rotating rod are movably connected to the tail of the seat via a joint mechanism; the rotating rod is connected to an adjustment mechanism for adjusting the tilt angle of the backrest, the adjustment mechanism is connected to a rocker arm, and the rocker arm is connected to a handle, characterized in that: The adjusting mechanism is connected to the middle part of the rotating rod, and the rocker is extended to one side by the rocker handle; the adjusting mechanism comprises an adjusting sheet and a positioning sheet, the adjusting sheet is provided with adjusting teeth, and the positioning sheet is provided with positioning teeth; the adjusting sheet is assembled and fixed with the rotating rod, the positioning sheet is pivotally assembled in a fixed seat through a rotating shaft, and the fixed seat is connected and fixed with the seat frame; the tail of the positioning sheet is hingedly connected with a pushing arm, the pushing arm is connected and fixed with the rocker, a pulling spring is connected between the positioning sheet and the fixed seat, the positioning sheet is pulled by the pulling spring to make the positioning teeth and the adjusting teeth of the adjusting sheet clamped with each other to realize the positioning of the backrest.

2. The lunch chair backrest adjustment structure according to claim 1, characterized in that: The adjusting sheet comprises a plurality of adjusting teeth, each adjusting tooth corresponds to the angle of one gear of the backrest, and the adjusting teeth are arranged in an arc shape at the front end of the adjusting sheet; the positioning sheet comprises one positioning tooth, the positioning tooth protrudes forward at the top of the front end of the positioning sheet, and the backrest is positioned at the corresponding gear angle by clamping any adjusting tooth with the positioning tooth.

3. The lunch chair backrest adjustment structure according to claim 2, characterized in that: The front end bottom of the positioning sheet is pivotally installed in the fixed seat through the shaft seats on both sides and the rotating shaft, the lower end of the pulling spring is connected to the upper end of the tail of the positioning sheet, and the upper end of the pulling spring is connected to the fixed seat to pull the tail of the positioning sheet upward to make the positioning tooth and the adjusting tooth of the adjusting sheet clamped.

4. The lunch chair backrest adjustment structure according to claim 1, characterized in that: A fixed arm extending rearward is arranged at the tail of the adjusting sheet, the fixed arm is inserted into the rotating rod to assemble and fix the positioning sheet with the rotating rod.

5. The lunch chair backrest adjustment structure according to claim 4, characterized in that: Auxiliary arms are arranged at the upper part and the lower part of the adjusting sheet respectively, the inner side of the auxiliary arm is in a circular arc structure, after the fixed arm is inserted into the rotating rod, the auxiliary arm is clamped on the circumferential surface of the rotating rod.

6. The lunch chair backrest adjustment structure according to any one of claims 1-5, characterized in that: A protective cover is arranged outside the adjusting mechanism, the entire adjusting mechanism is covered inside the protective cover, and the rocker is inserted into one side of the protective cover.

7. The lunch chair backrest adjustment structure according to claim 1, characterized in that: Limiting sheets are arranged at both ends of the rotating rod respectively, the limiting sheets extend outward by a fan-shaped part, and the edge of the fan-shaped part abuts against the seat frame to form the maximum range of the rotation and adjustment of the backrest.

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