A study chair with electric lifting seat back

Abstract

The present invention relates to the field of application technology of study tables and chairs, and specifically to a study chair with an electrically-operated liftable seat back. The present invention comprises an electric lift mechanism assembly, a seat assembly, a seat back assembly and a chair leg assembly, wherein the electric lift mechanism assembly comprises a fixed tube fixed on the chair leg assembly and a seat lift tube sleeved on the fixed tube, wherein the seat lift tube is lifted and lowered on the fixed tube, wherein the seat assembly is fixed on the seat lift tube, wherein the seat lift tube is sleeved with a back lift tube, wherein the back lift tube is lifted and lowered on the seat lift tube, wherein the chair back assembly is fixed on the back lift tube, and the present invention effectively realizes synchronous or separate adjustment of the seat assembly and the chair back assembly by improving the electric lift mechanism assembly, and is more suitable for use by children of a younger age group, and has economic and social benefits.

Description

Technical Field

[0001] The invention relates to the technical field of application of study tables and chairs, in particular to a study chair with an electrically-operated seat back lift. Background Art

[0002] A child's body is constantly developing and growing. A study chair that is too high or too low will have an adverse effect on the child's physical development, causing problems such as hunchback and myopia. The first rule of correct study sitting posture is that the feet must be at a right angle or slightly less than 90 degrees to the thigh and calf. If the feet are suspended in the air or not firmly on the ground, the center of gravity will fall entirely on the thighs and buttocks, compressing the blood vessels, affecting blood circulation, and making the child feel uncomfortable. The child must constantly change postures and cannot maintain a correct sitting posture. He or she is prone to fatigue, which affects concentration.

[0003] In order to meet the needs of children's healthy learning, people have developed and designed children's learning tables and chairs. The existing children's learning chairs and posture correction chairs generally can only meet the function of seats. Adjusting the seat height and improving the comfort of the chair back are also one of the necessary functions of such seats. At present, most of the ways to adjust the seat height and back height of children's learning chairs and posture correction chairs in the industry are to screw the seat back and the chair frame or clamp them from the outside, which is more laborious. Although there are hand-cranked seat height adjustment methods on the market, the back height adjustment method still requires external clamping. These methods cannot be manually adjusted independently for children of younger ages. Summary of the invention

[0004] In view of the technical problems existing in the adjustment of the above-mentioned children's chair, the present invention proposes a seat back electric lifting learning chair which has a reasonable design, a compact structure and can be conveniently controlled by children of smaller age groups.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: the present invention provides a seat back electric lifting learning chair, including an electric lifting mechanism assembly, a seat assembly, a seat back assembly and a chair leg assembly, the electric lifting mechanism assembly includes a fixed tube fixed on the chair leg assembly and a seat lifting tube sleeved on the fixed tube, the seat lifting tube is lifted and arranged on the fixed tube, the seat assembly is fixed on the seat lifting tube, the seat lifting tube is sleeved with a back lifting tube outside the seat lifting tube, the back lifting tube is lifted and sleeved on the seat lifting tube, the chair back assembly is fixed on the back lifting tube, a first lifting nut is arranged in the fixed tube, a first screw rod is sleeved in the first lifting nut, a first motor is arranged on the top of the first screw rod, a lifting tube handle is arranged on the top of the seat lifting tube, the first motor is fixed in the lifting tube handle, a second lifting nut is arranged in the seat lifting tube, a second screw rod is sleeved in the second lifting nut, the second screw rod is sleeved outside the first screw rod, a second motor is connected to the top of the second screw rod, the second motor is a hollow reduction DC motor, and the second motor is fixedly connected to the back lifting tube.

[0006] Preferably, a nut tube is provided in the fixing tube, and the first lifting nut is fixed to the upper end of the fixing tube through the nut tube.

[0007] Preferably, the chair leg assembly is provided with a groove for placing a fixing tube, a bolt hole is provided at the bottom of the groove, and the fixing tube is fixed to the chair leg assembly by bolts.

[0008] Preferably, a connecting ring is provided at the back of the seat back assembly, and the seat back assembly is fastened above the back lifting tube by means of the connecting ring.

[0009] Preferably, a transverse connecting arm is provided at the bottom end of the seat lifting tube, and the connecting arm is fastened with bolts at the bottom of the seat assembly.

[0010] Preferably, the seat lifting tube and the lifting tube handle are detachably and securely connected.

[0011] Preferably, a transverse connecting hole is provided at the upper end of the seat lifting tube, and an elastic boss matching the connecting hole is provided at the bottom of the lifting tube handle, and a detachable and fastened connection is achieved between the seat lifting tube and the lifting tube handle by plugging the elastic boss into the transverse connecting hole.

[0012] Preferably, the electric lifting mechanism assembly also includes a DC power supply group, a control electronic board, a remote controller and a distance measuring switch group installed at the bottom of the chair leg assembly.

[0013] Preferably, the distance measuring switch group includes at least one of an obstacle avoidance sensor, a distance switch, and a button switch.

[0014] Preferably, the distance measuring switch includes a first obstacle avoidance sensor for measuring the upward movement of the back lifting tube, a second obstacle avoidance sensor for measuring the downward movement of the back lifting tube, a third obstacle avoidance sensor for measuring the upward movement of the seat lifting tube, and a fourth obstacle avoidance sensor for measuring the downward movement of the seat lifting tube.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are:

[0016] 1. The present invention provides a seat-back electrically liftable study chair, which effectively realizes synchronous or separate adjustment of the seat assembly and the seat-back assembly through the improvement of the electric lift mechanism assembly, is more suitable for children of younger ages, and has economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of a seat-back electrically liftable study chair provided in Example 1;

[0019] Figure 2 A schematic diagram of the structure of the electric lifting mechanism assembly provided in Example 1;

[0020] Figure 3 A schematic diagram of the structure of the electric lifting mechanism assembly provided in Example 1 without the back lifting tube;

[0021] Figure 4 A schematic diagram of the partial structure of the electric lifting mechanism assembly provided in Example 1;

[0022] Figure 5 A schematic diagram of the structure of the lifting tube handle provided in Example 1;

[0023] Figure 6 A schematic structural diagram of the first screw rod provided in Example 1;

[0024] Figure 7 A schematic diagram of the structure of the second screw rod provided in Example 1;

[0025] In the above figures, 1. seat assembly; 2. backrest assembly; 21. connecting ring; 3. leg assembly; 31. groove; 4. electric lifting mechanism assembly; 41. fixing tube; 411. nut tube; 42. seat lifting tube; 421. transverse connecting arm; 422. transverse connecting hole; 43. back lifting tube; 44. lifting tube handle; 441. elastic boss; 45. first lifting nut; 46. first screw rod; 47. first motor; 48. second lifting nut; 49. second screw rod; 491. second motor. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. 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.

[0027] 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 than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0028] Embodiment 1, as Figure 1 to Figure 7 As shown, the present embodiment aims to solve the technical problem that the seat and backrest of the existing children's learning chair are inconvenient for young children to adjust. For this reason, it is most convenient to change the lifting to electric lifting. Considering the size of the seat, in order to avoid the excessive size of the lifting mechanism, the present embodiment is specially proposed. In order to achieve the above purpose, the seat-back electric lifting learning chair provided by the present embodiment includes an electric lifting mechanism assembly 4, a seat assembly 1, a seat back assembly 2 and a chair leg assembly 3. In the present embodiment, the seat assembly 1, the seat back assembly 2 and the chair leg assembly 3 are all existing structures. In the present embodiment, the structure is not improved. The electric lifting mechanism assembly 4 that is improved in the embodiment includes a fixing tube 41 fixed on the chair leg assembly 3 and a seat lifting tube 42 sleeved on the fixing tube 41. In this embodiment, a groove 31 is provided on the chair leg assembly 3, and the fixing tube 41 is inserted into the groove 31. A bolt hole is provided at the bottom of the groove 31. The electric lifting mechanism assembly 4 is connected to the chair leg assembly 3 by bolts connected to the fixing tube 41. The seat lifting tube 42 is mainly used to realize the lifting of the seat assembly 1. For this purpose, the seat lifting tube 42 is set on the fixing tube 41 and the seat assembly is fixed on the seat lifting tube 42. Specifically, a transverse connecting arm 421 is provided at the bottom end of the seat lifting tube 42, and the connecting arm is fastened to the bottom bolt of the seat assembly 1.

[0029] In order to realize the lifting and lowering of the seat back assembly 2, a back lift tube 43 is sleeved on the seat lift tube 42, and the back lift tube 43 is lifted and sleeved on the seat lift tube 42, and the seat back assembly 2 is fixed on the back lift tube 43. Specifically, a connecting ring 21 is provided behind the seat back assembly 2. Considering the travel distance of the seat back assembly 2, the seat back assembly 2 is sleeved and fastened on the back lift tube 43 through the connecting ring 21. In this way, the moving distance of the seat back assembly 2 can be ensured.

[0030] In this way, the lifting and lowering of the seat back assembly 2 can be achieved, thereby completing the height adjustment of the seat back assembly 2.

[0031] In order to realize electric control and make the whole structure more compact, avoid the volume from becoming larger, and keep the volume of the existing learning chair lifting mechanism, a first lifting nut 45 is provided in the fixed tube 41, and a first screw rod 46 is sleeved in the first lifting nut 45. The first lifting nut 45 is fixed in the fixed tube 41. In order to allow a part of the first screw rod 46 to extend into the fixed tube 41, the first lifting nut 45 is arranged close to the top of the fixed tube 41, and a first motor 47 is arranged on the top of the first screw rod 46. In this way, under the drive of the first motor 47, the first screw rod 46 will change its position relative to the first lifting nut 45. To this end, it is only necessary to fix the first motor 47 on the seat. By placing the seat lifting tube 42 on the fixing tube 41, the lifting and lowering of the seat lifting tube 42 on the fixing tube 41 can be realized. For the convenience of installation, in the present embodiment, a lifting tube handle 44 is arranged on the top of the seat lifting tube 42, a motor seat is arranged in the lifting tube handle 44, the first motor 47 is fixed in the lifting tube handle 44, a transverse connecting hole 422 is arranged on the upper end of the seat lifting tube 42, an elastic boss 441 matching the connecting hole is arranged at the bottom of the lifting tube handle 44, and the seat lifting tube 42 and the lifting tube handle 44 are detachably and securely connected by plugging the elastic boss 441 into the transverse connecting hole 422. In this way, the height adjustment of the seat lifting tube 42 is realized by the arrangement of the lifting tube handle 44.

[0032] In order to enable the back lift tube 43 to be lifted and mounted on the seat lift tube 42, a partition is provided in the upper part of the seat lift tube 42, on which a second lift nut 48 is mounted, and a second screw rod 49 is mounted inside the second lift nut 48, and the second screw rod 49 is a hollow rod, so that the second screw rod 49 is mounted outside the first screw rod 46, and a second motor 491 is connected to the top of the second screw rod 49, and the second motor 491 is a hollow reduction DC motor, so that the first screw rod 46 passes through the second motor 491, and the second motor 491 is fixedly connected to the back lift tube 43. In this way, under the action of the second motor 491, the height adjustment of the chair back assembly 2 is achieved.

[0033] In order to facilitate the fixation of the fixing tube 41 and the first lifting nut 45, a nut tube 411 is provided in the fixing tube 41. The first lifting nut 45 is fixed to the upper end of the fixing tube 41 through the nut tube 411, and a threaded hole is provided at the bottom of the nut tube 411. The fixing of the fixing tube 41 is achieved by connecting with bolts.

[0034] In order to realize intelligent control, the electric lifting mechanism assembly 4 also includes a DC power supply group, a control electronic board, a remote controller and a distance measuring switch group installed at the bottom of the chair leg assembly 3. Among them, the DC power supply group is mainly used to power the first motor 47 and the second motor 491, the control electronic board is mainly used to realize related control, and the remote controller has the same wireless communication protocol as the control electronic board to realize the control of the first motor 47 and the second motor 491, which includes at least three switch buttons of back lifting, seat lifting and seat back lifting to facilitate the operation of children.

[0035] The main purpose of the distance measuring switch group is to achieve a maximum distance limit, and for this purpose, it includes at least one of an obstacle avoidance sensor, a distance switch, and a button switch. In this embodiment, the distance measuring switch includes a first obstacle avoidance sensor for measuring the upward movement of the back lift tube, a second obstacle avoidance sensor for measuring the downward movement of the back lift tube, a third obstacle avoidance sensor for measuring the upward movement of the seat lift tube, and a fourth obstacle avoidance sensor for measuring the downward movement of the seat lift tube. In this way, the maximum moving distance is limited by the setting of the obstacle avoidance sensor. Since the control of the motor and the use of the obstacle avoidance sensor belong to the existing mature technology, they are not described in detail in this embodiment.

[0036] The lifting working principle is described in detail as follows:

[0037] Working principle of guided step lifting: when the seat lifting button on the remote control is operated, the first motor 47 obtains power such as positive power, the motor output shaft rotates to drive the first screw rod 46 to rotate in the positive direction, and the first screw rod 46 spirals up around the first lifting nut 45. Because the first lifting nut 45 is screwed and fixed on the fixed tube 41, the upper connection hole of the seat lifting tube 42 is tightly connected with the elastic protrusion 441 at the lower end of the lifting tube handle 44. When the lifting tube handle 44 is pushed up by the first screw rod 46, it drags the seat lifting tube 42 to rise synchronously, so that the seat height is raised. Similarly, when the first motor 47 obtains negative power, it drives the first screw rod 46 to reverse, and the lifting tube handle 44 pushes down to make the seat lifting tube 42 fall, so that the seat height is lowered.

[0038] When the backrest lifting button on the remote control is operated and the second motor 491 obtains power such as positive power, since the second screw rod 49 is a hollow tube, it coaxially passes through the outside of the first screw rod 46, and also passes through the second motor 491, and is tightly connected to the second motor 491 at the upper end of the second screw rod 49; the rotation of the motor output shaft drives the second screw rod 49 to rotate in the positive direction, and the second screw rod 49 spirally rises around the second lifting nut 48, because the second lifting nut 48 is installed in the seat lifting tube 42; the thrust on the screw rod drives the back lifting tube 43 to rise, thereby driving the backrest assembly 2 to rise; similarly, when the second motor 491 obtains negative power, the rotation of the motor output shaft drives the second screw rod 49 to rotate in the reverse direction, and the reverse thrust causes the back lifting tube 43 to descend with the backrest assembly 2.

[0039] Working principle of synchronous lifting: When the synchronous lifting button on the remote control is operated, the first motor 47 and the second motor 491 obtain power at the same time. For example, when the power is positive, the first motor 47 drives the first screw rod 46 to rotate in the positive direction. When the lifting tube handle 44 is pushed up by the first screw rod 46, the seat lifting tube 42 is pulled up synchronously to achieve the height increase of the seat. At the same time, the output shaft of the second motor 491 rotates to drive the second screw rod 49 to rotate in the positive direction. The second screw rod 49 spirals up around the second lifting nut 48. The thrust on the screw rod drives the back lifting tube 43 to rise, thereby driving the chair back assembly 2 to rise.

[0040] Similarly, when the synchronous lifting key on the remote control is operated, the first motor 47 and the second motor 491 simultaneously obtain negative power, and when the first motor 47 obtains negative power, it drives the first screw rod 46 to reverse, and the lifting tube handle 44 lowers the seat lifting tube 42 to lower the seat height. At the same time, when the second motor 491 obtains negative power, the motor output shaft rotates to drive the second screw rod 49 to rotate in the opposite direction, and the reverse thrust causes the back lifting tube 43 to lower the chair back assembly 2.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A seat back electrically liftable study chair, comprising an electric lift mechanism assembly, a seat assembly, a seat back assembly and a chair leg assembly, characterized in that: The electric lifting mechanism assembly includes a fixed tube fixed on the chair leg assembly and a seat lifting tube sleeved on the fixed tube, the seat lifting tube is lifted and lowered on the fixed tube, the chair seat assembly is fixed on the seat lifting tube, a back lifting tube is sleeved on the outside of the seat lifting tube, the back lifting tube is lifted and lowered on the seat lifting tube, the chair back assembly is fixed on the back lifting tube, a first lifting nut is arranged in the fixed tube, a first screw rod is sleeved in the first lifting nut, a first motor is arranged on the top of the first screw rod, a lifting tube handle is arranged on the top of the seat lifting tube, the first motor is fixed in the lifting tube handle, a second lifting nut is arranged in the seat lifting tube, a second screw rod is sleeved in the second lifting nut, the second screw rod is sleeved outside the first screw rod, a second motor is connected to the top of the second screw rod, the second motor is a hollow reduction DC motor, and the second motor is fixedly connected to the back lifting tube.

2. The electric liftable study chair according to claim 1, characterized in that: A nut tube is arranged in the fixing tube, and the first lifting nut is fixed to the upper end of the fixing tube through the nut tube.

3. The electric liftable study chair according to claim 2, characterized in that: The chair leg assembly is provided with a groove for placing a fixing tube, the bottom of the groove is provided with a bolt hole, and the fixing tube is fixed to the chair leg assembly by bolts.

4. The electric liftable study chair according to claim 3, characterized in that: A connecting ring is arranged behind the seat back assembly, and the seat back assembly is fastened above the back lifting tube through the connecting ring.

5. The electric liftable study chair according to claim 4, characterized in that: A transverse connecting arm is arranged at the bottom end of the seat lifting tube, and the connecting arm is fastened with bolts at the bottom of the seat assembly.

6. The seat back electrically adjustable study chair according to claim 5, characterized in that: The seat lifting tube and the lifting tube handle are detachably and firmly connected.

7. The electric liftable study chair according to claim 6, characterized in that: A transverse connecting hole is arranged at the upper end of the seat lifting tube, and an elastic boss matching the connecting hole is arranged at the bottom of the lifting tube handle, and the seat lifting tube and the lifting tube handle are detachably and securely connected by plugging the elastic boss into the transverse connecting hole.

8. A seat back electrically adjustable study chair according to any one of claims 1 to 7, characterized in that: The electric lifting mechanism assembly also includes a DC power supply group, a control electronic board, a remote controller and a distance measuring switch group installed at the bottom of the chair leg assembly.

9. The seat back electrically adjustable study chair according to claim 8, characterized in that: The distance measuring switch group includes at least one of an obstacle avoidance sensor, a distance switch, and a button switch.

10. The seat back electrically adjustable study chair according to claim 8, characterized in that: The distance measuring switch includes a first obstacle avoidance sensor for measuring the upward movement of the back lifting tube, a second obstacle avoidance sensor for measuring the downward movement of the back lifting tube, a third obstacle avoidance sensor for measuring the upward movement of the seat lifting tube, and a fourth obstacle avoidance sensor for measuring the downward movement of the seat lifting tube.

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