CN216602067U - Multifunctional tablet chair for lower-grade students - Google Patents

Abstract

The utility model discloses a multifunctional tablet chair for students in lower grades, which comprises a seat board, leg pads, a transition board, a back board, a pillow board, two groups of height adjusting components, a group of leg pad rotating components, two groups of back board rotating components, a control component and two U-shaped support frames, wherein the two U-shaped support frames are arranged side by side and are fixedly connected through a connecting board, the seat board is arranged on the two U-shaped support frames in a sliding manner, the two groups of height adjusting components are respectively arranged on the two U-shaped support frames, and two sets of height adjusting components are connected with the seat board, one end of the transition board is hinged with one end of the seat board, the other end is hinged with the leg pad board, the back board is hinged with the other end of the seat board, the leg pad board rotating component and the two sets of back board rotating components are arranged at the lower end of the seat board, the leg pad plate rotating assembly is connected with the leg pad plate, the back plate rotating assembly is connected with the back plate, and the control assembly is arranged on the U-shaped supporting frame; the multifunctional tablet chair can facilitate the students in the lower grades to lie and rest during noon break.

Description

Multifunctional tablet chair for lower-grade students

Technical Field

The utility model relates to the field of school instruments, in particular to a multifunctional tablet chair for low-grade students.

Background

At present, the students of lower grade generally lie prone the head and rest on the desk when having a rest in noon break, can cause discomforts such as soreness of the waist back pain, hand and foot numbness etc. to the student like this, can cause a great deal of harmful effects to student's growth and development again, such as hunchback bow, cervical vertebra warp etc. and only ordinary desk in present general school can't provide good noon break device for the student.

SUMMERY OF THE UTILITY MODEL

The multifunctional tablet chair is convenient to operate, safe, reliable, simple in structure and low in cost, can be deformed, and facilitates the laying and rest of the students in the lower grades during noon break.

In order to solve the technical problem, the technical scheme of the utility model is realized by the following modes: a multifunctional tablet chair for students in lower grades comprises a seat board, leg cushion boards, a transition board, a back board, a pillow board, a control component, two groups of height adjusting components, a group of leg cushion board rotating components, two groups of back board rotating components and two U-shaped support frames, wherein the two U-shaped support frames are arranged side by side and fixedly connected through a connecting board, the seat board is arranged on the two U-shaped support frames in a sliding manner, the two groups of height adjusting components are respectively arranged on the two U-shaped support frames, the two groups of height adjusting components are hinged with the lower end of the seat board, one end of the transition board in the width direction is hinged with one end of the seat board in the width direction, the other end of the transition board is hinged with one end of the leg cushion boards in the width direction, the back board is hinged with the other end of the seat board, the leg cushion board rotating components and the two groups of back board rotating components are both arranged at the lower end of the seat board, the leg cushion board rotating components are hinged with the leg cushion boards, the back board rotating components are hinged with the back board, the pillow plate is arranged on the back plate in a sliding way;

the two ends of the seat plate along the width direction are respectively provided with a sliding boss in an outward forming mode, each sliding boss is in sliding fit with the inner wall of the U-shaped support frame, one side of the lower end of each sliding boss along the length direction is provided with a first hinged support, and each first hinged support is far away from the other first hinged support;

a mounting plate is fixedly arranged at the middle section of each U-shaped support frame along the vertical direction, and two ends of the mounting plate are connected with two side walls of the U-shaped support frame; each mounting plate is provided with a first through groove;

each group of height adjusting assemblies comprises a first servo motor, a first lead screw sliding block, a first bearing seat and a first connecting rod, wherein the first servo motor and the first bearing seat are fixedly arranged at the lower end of the mounting plate, the first servo motor and the first bearing seat are respectively positioned at two sides of the first through groove along the length direction, one end of the first lead screw is sleeved on the first bearing seat, the other end of the first lead screw is fixedly connected with an output shaft of the first servo motor through a first shaft sleeve, the first lead screw sliding block is slidably arranged on the first lead screw, one end of the first connecting rod is hinged with the first lead screw sliding block, and the other end of the first connecting rod is hinged with the first hinge seat; the first servo motor in each group of height adjusting assemblies is electrically connected with the control assembly;

the first connecting rod penetrates through the first through groove and is in sliding fit with the side wall of the first through groove;

according to the utility model, the leg pad plate, the transition plate, the back plate, the leg pad plate rotating assembly and the back plate rotating assembly are matched, and the control assembly can be controlled by one key, so that the leg pad plate and the back plate can be rotated and spread, the tablet chair is changed into a simple small bed, a low-grade student can conveniently lie and rest in the noon break, and the operation is simple; the simple small bed can be wholly descended through the arranged height adjusting assembly, so that the upper ends of the U-shaped supporting frames on the two sides are exposed to be used as anti-falling handrails, and the structure is exquisite; the pillow board and the backplate sliding connection that set up can be adjusted according to student's size, adapts to the student of different sizes, and application scope is wide.

The technical scheme of the utility model is further defined as follows:

the control assembly comprises a lithium battery pack, a PLC (programmable logic controller) processor and a controller, a bottom plate is arranged between the two U-shaped support frames and is arranged close to the lower ends of the U-shaped support frames, the lithium battery pack and the PLC processor are fixedly arranged on the bottom plate and are electrically connected with each other, guard plates are arranged at the upper ends of the two U-shaped support frames, the controller is embedded in one of the guard plates and is electrically connected with the PLC processor, and the first servo motor is electrically connected with the PLC processor; the height adjusting assembly, the leg pad plate rotating assembly and the back plate rotating assembly can be controlled to be started through the controller in one key mode, so that the leg pad plate, the transition plate and the back plate can be automatically rotated and unfolded, and a nurse teacher can conveniently operate the class chair of the whole class at the same time.

The leg pad plate rotating assembly comprises a second servo motor, a second lead screw, a second bearing seat, a second lead screw sliding block and a second connecting rod, the second servo motor and the second bearing seat are fixedly arranged at the lower end of the seat plate, one end of the second lead screw is sleeved on the second bearing seat, the other end of the second lead screw is fixedly connected with an output shaft of the second servo motor through a second shaft sleeve, the second lead screw sliding block is arranged on the second lead screw in a sliding mode, one end of the second connecting rod is hinged with the lower end of the second lead screw sliding block, the other end of the second connecting rod is hinged with a second hinged support arranged at the lower end of the leg pad plate, the second hinged support is located in the middle section of the lower end of the leg pad plate, and the second servo motor is electrically connected with the PLC; the second screw rod slide block drives the second connecting rod to push the leg pad plate and the transition plate to rotate in the sliding process, so that the seat plate, the leg pad plate and the transition plate are gradually parallel, and the legs of the students in the lower grades can be conveniently placed on the leg pad plate.

The second connecting rod is a V-shaped rod consisting of two sections of rectangular rods, and the included angle between the two sections of rectangular rods is alpha degrees, and is less than 90 < alpha > 150; the second connecting rod with the V-shaped structure can prevent the second connecting rod from interfering with the second bearing seat.

An angle limiting block is arranged at the lower end of the leg pad plate and corresponds to the position of the second connecting rod, and the angle limiting block is arranged close to the second hinged support; the angle limiting block can limit the angle between the leg pad plate and the second connecting rod when the leg pad plate is retracted, and prevent the leg pad plate from being excessively matched with the transition plate in angle to cause damage.

Each group of back plate rotating assemblies comprises a third servo motor, a third screw rod, an internal thread sleeve and a third connecting rod, two first hinged bosses are formed outwards at the positions, close to the lower end, of the middle sections of the back plates and the lower end, far away from the leg pad plate, of the seat plate, one end, far away from the back plate, of each first hinged boss is provided with a rectangular notch in an inward forming mode, and a first sliding groove is formed in the position, corresponding to the rectangular notch, of each first hinged boss; the inner thread sleeve is a cylinder with an opening at one end, threads are arranged on the inner wall of the inner thread sleeve, a round hole is formed in the bottom end of the inner thread sleeve, one end of a third connecting rod penetrates through the round hole in the bottom end of the inner thread sleeve and extends into the inner thread sleeve, a thread boss is arranged at one end of the third connecting rod extending into the inner thread sleeve and is in threaded fit with the inner wall of the inner thread sleeve, a hinge block is arranged at the other end of the third connecting rod, a sliding pin shaft is sleeved on the hinge block and is arranged in a first sliding groove in a sliding mode, the hinge block is in sliding fit with the rectangular notch, one end, far away from the third connecting rod, of the inner thread sleeve is fixedly connected with an output shaft of a third servo motor, the third servo motor is fixedly arranged at the lower end of the seat plate, and the third servo motor is electrically connected with the PLC processor; the third connecting rod pushes the back plate to rotate, so that the structure is simple, and the cost is saved.

The pillow board is connected with the back board through a sliding component; the sliding assembly comprises a rectangular sliding rod, a sliding seat, a thrust spring and a limiting sliding block, wherein a tooth-shaped boss is arranged at one end of the limiting sliding block, and an adjusting rod is arranged at one end of the limiting sliding block, which is provided with the tooth-shaped boss, and extends outwards; the upper end of the rectangular sliding rod is connected with one end of the pillow plate along the thickness direction of the pillow plate, the sliding seat is arranged at one side end of the back plate along the thickness direction of the back plate and far away from the seat plate, the sliding seat is provided with a second sliding groove along the length direction of the sliding seat, the second sliding groove is internally formed and provided with a plurality of tooth-shaped grooves along the thickness direction and far away from one side wall of the back plate, the rectangular sliding rod is internally formed and provided with a limiting sliding groove along the thickness direction, a limiting sliding block is arranged in the limiting sliding groove in a sliding manner, a thrust spring is arranged in the limiting sliding groove, one end of the thrust spring abuts against the limiting sliding block, the other end of the thrust spring abuts against the bottom of the limiting sliding groove, and the tooth-shaped boss is movably meshed with the tooth-shaped grooves; a second through groove matched with the adjusting rod is formed in the position, corresponding to the second sliding groove, on the sliding seat, and the adjusting rod penetrates through the second through groove to be exposed out of the sliding seat; the slip subassembly that sets up, the student can adjust the position of pillow board according to the height by oneself to adapt to own height.

The transition plate is a rectangular plate, one end of the transition plate in the width direction is provided with a second hinged boss, the second hinged boss is arranged on one side of the transition plate in the thickness direction, one end of the leg pad plate in the width direction is provided with a third hinged seat, the second hinged boss is hinged with the third hinged seat, the second hinged boss is provided with a limiting step, and when the leg pad plate rotates until the transition plate is parallel to the leg pad plate, the limiting step is abutted against the leg pad plate; spacing step offsets with the leg pad board, and the biggest angle of the outside upset of restriction leg pad board prevents the transition upset of leg pad board.

The upper end surfaces of the seat plate, the leg cushion plate, the transition plate, the back plate and the pillow plate are all provided with soft cushions; increasing comfort.

A cover plate is arranged on one side of each of the two U-shaped supporting frames, which is far away from the seat plate along the thickness direction, the lower end of each cover plate is connected with the bottom plate, a soft rubber sleeve is connected between side arms of the two U-shaped supporting frames, which are far away from the leg pad plate, the lower end of each soft rubber sleeve is connected with the bottom plate, the upper end of each soft rubber sleeve is connected with the back plate, and the connection part is close to the hinge joint of the back plate and the seat plate; the lower part of the tablet chair is sealed by matching the cover plate, the soft rubber sleeve and the bottom plate, so that the problem that students in the lower level are injured by stretching hands into the mechanical structure part due to curiosity and greediness is avoided.

The utility model has the beneficial effects that: according to the technical scheme, the leg cushion plate, the transition plate, the back plate, the leg cushion plate rotating assembly and the back plate rotating assembly are matched, and the control assembly is arranged, so that the leg cushion plate and the back plate can be rotated and spread by one key, the tablet chair is changed into a simple small bed, the low-grade students can conveniently lie and have a rest in the noon break, and the operation is simple; the simple small bed can be wholly descended through the arranged height adjusting assembly, so that the upper ends of the U-shaped supporting frames on the two sides are exposed to be used as anti-falling handrails, and the structure is exquisite; the pillow board is arranged to be in sliding connection with the back board, can be adjusted according to the body types of students, is suitable for students with different body types, and is wide in application range; the controller can control the starting of the height adjusting assembly, the leg pad plate rotating assembly and the back plate rotating assembly by one key, so that the leg pad plate, the transition plate and the back plate can be automatically rotated and unfolded, and a nurse teacher can conveniently operate the class chair of the whole class at the same time; the slip subassembly that sets up, the student can adjust the position of pillow board according to the height by oneself to adapt to own height.

Drawings

FIG. 1 is a semi-expanded axial structural view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3 at C;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 2;

FIG. 6 is an enlarged view of a portion of FIG. 5 at D;

FIG. 7 is a rear view of the present invention;

FIG. 8 is a cross-sectional view taken at E-E of FIG. 7;

FIG. 9 is an enlarged view of a portion of FIG. 8 at F;

FIG. 10 is an enlarged view of a portion of FIG. 8 at G;

FIG. 11 is an axial structural view of the present invention in a folded state;

FIG. 12 is an expanded axial structural view of the present invention;

wherein: 1-seat plate, 1 a-sliding boss, 2-leg pad plate, 2 a-second hinged support, 3-transition plate, 4-back plate, 5-pillow plate, 6-U-shaped support frame, 7-connecting plate, 8-mounting plate, 8 a-first through groove, 9-first servo motor, 10-first lead screw, 11-first lead screw sliding block, 12-first bearing seat, 13-first connecting rod, 14-first shaft sleeve, 15-first hinged support, 16-lithium battery pack, 17-PLC processor, 18-controller, 19-bottom plate, 20-guard plate, 21-second servo motor, 22-second lead screw, 23-second bearing seat, 24-second lead screw sliding block, 25-second connecting rod, 26-second shaft sleeve, 27-a third servo motor, 29-an internal thread sleeve, 30-a third connecting rod, 30 a-a thread boss, 31-a first hinge boss, 31 a-a rectangular notch, 31 b-a first sliding groove, 32-a hinge block, 33-a sliding pin shaft, 34-a rectangular sliding rod, 34 a-a limit sliding groove, 35-a sliding seat, 35 a-a second sliding groove, 35 b-a tooth-shaped groove, 35 c-a second through groove, 36-a thrust spring, 37-a limit sliding block, 37 a-a tooth-shaped boss, 37 b-an adjusting rod, 38-a second hinge boss, 38 a-a limit step, 39-a third hinge seat, 40-an angle limit block, 41-a soft cushion and 42-a cover plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements can be directly connected or indirectly connected through an intermediate medium, and the two elements can be communicated with each other, so that the specific meaning of the terms in the utility model can be understood by those skilled in the art.

Example 1

As shown in figures 1 and 3, the multifunctional tablet chair for the lower-grade students comprises a seat plate 1, a leg pad plate 2, a transition plate 3, a back plate 4, a pillow plate 5, a control component, two groups of height adjusting components, one group of leg pad plate rotating components, two groups of back plate rotating components and two U-shaped support frames 6, wherein the two U-shaped support frames 6 are arranged side by side and fixedly connected through a connecting plate 7, the seat plate 1 is arranged on the two U-shaped support frames 6 in a sliding way, the two groups of height adjusting components are respectively arranged on the two U-shaped support frames 6, and the two groups of height adjusting components are hinged with the lower end of the seat plate 1, the two groups of height adjusting components support the seat plate 1 together, the height of the seat board 1 is controlled through the two groups of height adjusting assemblies, when the seat board 1 slides downwards, the two U-shaped supporting frames 6 are gradually higher than the seat board 1, and the part of the U-shaped supporting frame 6 higher than the seat board 1 can be used as a falling prevention railing; one end of the transition plate 3 in the width direction is hinged with one end of the seat plate base plate 1 in the width direction, the other end of the transition plate is hinged with one end of the leg pad plate 2 in the width direction, when the leg pad plate 2 is driven by the leg pad plate rotating assembly to rotate, the arranged transition plate 3 is matched with the leg pad plate 2 to synchronously rotate, the space can be effectively saved in a folded state, and the leg pad plate 2 is spliced after being unfolded, so that most of the legs of students are positioned on the leg pad plate 2; the back plate 4 is hinged with the other end of the seat plate 1, the leg pad plate rotating assembly and the two groups of back plate rotating assemblies are arranged at the lower end of the seat plate 1, the leg pad plate rotating assembly is hinged with the leg pad plate 2, the back plate rotating assembly is hinged with the back plate 4, the pillow plate 5 is arranged on the back plate 4 in a sliding mode, and the position of the pillow plate 5 on the back plate 4 is adjusted to adapt to students with different heights;

the two ends of the seat plate 1 in the width direction are respectively provided with a sliding boss 1a in an outward forming mode, and each sliding boss 1a is in sliding fit with the inner wall of the U-shaped support frame 6, so that the seat plate 1 is limited to only slide up and down along the inner wall of the U-shaped support frame 6; one side of the lower end of each sliding boss 1a along the length direction is provided with a first hinged support 15, and each first hinged support 15 is far away from the other first hinged support 15, so that the first connecting rods 13 can conveniently support the seat plate 1 from different positions, namely the first connecting rods 13 in the two groups of height adjusting assemblies are crossed when supporting the seat plate 1, and the seat plate 1 is more stably supported;

the middle section of each U-shaped support frame 6 along the vertical direction is fixedly provided with a mounting plate 8 through welding, and two ends of each mounting plate 8 are connected with two side walls of each U-shaped support frame 6; each mounting plate 8 is provided with a first through groove 8 a;

as shown in fig. 5 and 6, each group of height adjusting assemblies includes a first servo motor 9, a first lead screw 10, a first lead screw slider 11, a first bearing seat 12 and a first connecting rod 13, the first servo motor 9 and the first bearing seat 12 are both fixedly disposed at the lower end of the mounting plate 8, the first servo motor 9 and the first bearing seat 12 are respectively located at two sides of the first through slot 8a along the length direction, one end of the first lead screw 10 is sleeved on the first bearing seat 12, the other end of the first lead screw 10 is fixedly connected with an output shaft of the first servo motor 9 through a first shaft sleeve 14, the first lead screw slider 11 is slidably disposed on the first lead screw 10, one end of the first connecting rod 13 is hinged to the first lead screw slider 11, and the other end of the first connecting rod 13 is hinged to a first hinge seat 15; the first servo motor 9 in each group of height adjusting assemblies is electrically connected with the control assembly; the control assembly sends an instruction to the first servo motors 9 in the two groups of height adjusting assemblies at the same time, the two first servo motors 9 are synchronously started to enable the first lead screws 10 connected with the output shafts of the two first lead screws to synchronously rotate, when the first lead screws 10 rotate, the first lead screw sliders 11 arranged on the first lead screws are limited by the matching of the first connecting rods 13 and the first hinge seats 15 and cannot rotate in the circumferential direction, the first lead screw sliders 11 slide along the first lead screws 10 through the thread matching between the first lead screws 10 when the first lead screws 10 rotate, the two first lead screw sliders 11 in the two groups of height adjusting assemblies slide in the back direction and drive the first connecting rods 13 hinged with the first lead seats 15 to rotate by taking the first hinge seats 15 as axes, when the first connecting rods 13 rotate, the positions of the upper ends of the first lead screws in the vertical direction change, but the positions of the first lead screws in the horizontal direction are limited by the first hinge seats 15 and kept unchanged, the seat plate 1 slides in the vertical direction;

the first connecting rod 13 penetrates through the first through groove 8a and is in sliding fit with the side wall of the first through groove 8 a;

as shown in fig. 3, the control assembly includes a lithium battery pack 16, a PLC processor 17 and a controller 18, a bottom plate 19 is disposed between the two U-shaped support frames 6, the bottom plate 19 is disposed near the lower ends of the U-shaped support frames 6, the lithium battery pack 16 and the PLC processor 17 are both fixedly disposed on the bottom plate 19, the lithium battery pack 16 is electrically connected to the PLC processor 17, guard plates 20 are disposed at the upper ends of the two U-shaped support frames 6, the controller 18 is embedded in one of the guard plates 20, the controller 18 is electrically connected to the PLC processor 17, and the first servo motor 9 is electrically connected to the PLC processor 17; the lithium battery pack 16 provides a power supply for the whole circuit, the PLC processor 17 can control the on-off of the circuit between the lithium battery pack 16 and the height adjusting assembly, between the leg pad rotating assembly and the backboard rotating assembly, and the controller 18 can input instructions to the PLC processor 17.

As shown in fig. 3, the leg pad plate rotating assembly includes a second servo motor 21, a second screw 22, a second bearing seat 23, a second screw slider 24 and a second connecting rod 25, the second servo motor 21 and the second bearing seat 23 are both fixedly disposed at the lower end of the seat plate 1, one end of the second screw 22 is sleeved on the second bearing seat 23, the other end of the second screw 22 is fixedly connected with an output shaft of the second servo motor 21 through a second bushing 26, the second screw slider 24 is slidably disposed on the second screw 22, one end of the second connecting rod 25 is hinged to the lower end of the second screw slider 24, the other end of the second connecting rod 25 is hinged to a second hinge seat 2a disposed at the lower end of the leg pad plate 2, the second hinge seat 2a is located at the middle section of the lower end of the leg pad plate 2, and the second servo motor 21 is electrically connected to the PLC processor 17; when the second servo motor 21 is started, the second lead screw 22 rotates synchronously with the output shaft of the second servo motor 21, the second lead screw slider 24 is limited by the second connecting rod 25 and the second hinge base 2a in a matching manner and cannot rotate along the circumferential direction, therefore, when the second lead screw 22 rotates, the second lead screw slider 24 slides on the second lead screw 22 through the thread matching with the second lead screw 22, when the second lead screw slider 24 slides, the second connecting rod 25 is driven to slide, when the position of the second connecting rod 25 changes, one end of the second lead screw slider drives the leg pad plate 2 to rotate, and when the position of the leg pad plate 2 changes, the transition plate 3 rotates synchronously.

As shown in fig. 3, the second connecting rod 25 is a V-shaped rod consisting of two sections of rectangular rods, and the included angle between the two sections of rectangular rods is alpha degrees, 90 < alpha < 150, the preferred value of alpha is 120; when the second connecting rod 25 slides, the included angle can avoid the second bearing seat 23, so as to prevent the interference between the second bearing seat 23 and the second connecting rod 25.

An angle limiting block 40 is arranged at the lower end of the leg pad plate 2 and corresponding to the position of the second connecting rod 25, and the angle limiting block 40 is arranged close to the second hinged support 2 a; when the leg pad plate 2 is folded along with the second connecting rod 25, the leg pad plate 2 is preferentially rotated under the influence of a structure hinged with the transition plate 3, after the leg pad plate 2 rotates until the angle limiting block 40 abuts against the second connecting rod 25, the leg pad plate 2 is self-limited and cannot be continuously rotated on the current horizontal plane, the limited leg pad plate 2 drives the transition plate 3 to rotate, the hinged part of the leg pad plate 2 rotates downwards in the rotating process of the transition plate 3, so that the leg pad plate 2 slides downwards in the vertical direction, the angle limiting block 40 rotates towards the direction far away from the second connecting rod 25, the second connecting rod 25 is separated from the angle limiting block 40, the second connecting rod 25 can continuously slide along with the second lead screw slider 24, after the angle limiting block 40 abuts against the second connecting rod 25 again, the transition plate 3 is driven by the leg pad plate 2 and rotates again, and the reciprocating operation is carried out until the leg pad plate 2 is parallel to the transition plate 3, and the angle limiting block 40 abuts against the second connecting rod 25.

Each group of backboard rotating assemblies comprises a third servo motor 27, an internal thread sleeve 29 and a third connecting rod 30, two first hinge bosses 31 are outwards formed at the positions, close to the lower end, of the middle sections of the backboard 4 and the lower end, far away from the leg pad plate 2, of the seat plate 1, hinged to the backboard 4, of the lower end, one end, far away from the backboard 4, of each first hinge boss 31 is inwards formed to be provided with a rectangular notch 31a, and a first sliding groove 31b is formed in the position, corresponding to the rectangular notch 31a, of each first hinge boss 31; the internal thread sleeve 29 is a cylinder with an opening at one end, the inner wall of the internal thread sleeve 29 is provided with threads, the bottom end of the internal thread sleeve 29 is provided with a round hole, one end of the third connecting rod 30 passes through the round hole at the bottom end of the internal thread sleeve 29 and extends into the internal thread sleeve 29, and one end of the third connecting rod 30 extending into the internal thread sleeve 29 is provided with a thread boss 30a, the thread boss 30a is in thread fit with the inner wall of the internal thread sleeve 29, the other end of the third connecting rod 30 is provided with a hinge block 32, the hinge block 32 is sleeved with a sliding pin shaft 33, the sliding pin shaft 33 is slidably arranged in the first sliding groove 31b, the hinge block 32 is in sliding fit with the rectangular notch 31a, one end, far away from the third connecting rod 30, of the internal thread sleeve 29 is fixedly connected with an output shaft of the third servo motor 27, the third servo motor 27 is fixedly arranged at the lower end of the seat plate 1, and the third servo motor 27 is electrically connected with the PLC 17; after the third servo motor 27 is started, the output shaft of the third servo motor drives the internal threaded sleeve 29 to rotate in situ, when the internal threaded sleeve 29 rotates in situ, the threaded boss 30a slides in the internal threaded sleeve 29 through the threaded fit with the threaded boss 30a, the threaded boss 30a drives the third connecting rod 30 to slide, when the third connecting rod 30 slides, the hinge block 32 is driven to slide in the horizontal direction, and the sliding pin 33 on the hinge block 32 is in sliding fit with the first sliding groove 31b, so that when the hinge block 32 slides horizontally, the sliding pin 33 slides in the first sliding groove 31b, and meanwhile, the sliding pin 33 pushes the first hinge boss 31 to rotate, so as to adapt to the sliding pin 33 sliding in the first sliding groove 31b, that is, the back plate 4 rotates therewith.

In this embodiment, the first servo motor 9, the second servo motor 21, the third servo motor 27, the lithium battery pack 16, the PLC processor 17, and the controller 18 are known products in the electromechanical field, and can be purchased directly.

As shown in fig. 4, the headrest plate 5 is connected with the back plate 4 through a sliding assembly; the sliding assembly comprises a rectangular sliding rod 34, a sliding seat 35, a thrust spring 36 and a limiting sliding block 37, wherein a tooth-shaped boss 37a is arranged at one end of the limiting sliding block 37, and an adjusting rod 37b extends outwards from one end of the limiting sliding block 37, which is provided with the tooth-shaped boss 37 a; the upper end of the rectangular sliding rod 34 is connected with one end of the pillow plate 5 along the thickness direction thereof, the sliding seat 35 is arranged at one side end of the back plate 4 along the thickness direction thereof and far away from the seat plate 1, the sliding seat 35 is provided with a second sliding groove 35a along the length direction thereof, the second sliding groove 35a is provided with a plurality of tooth-shaped grooves 35b along the thickness direction and far away from one side wall of the back plate 4, the rectangular sliding rod 34 is provided with a limit sliding groove 34a along the thickness direction, the limit sliding block 37 is arranged in the limit sliding groove 34a in a sliding manner, the thrust spring 36 is arranged in the limit sliding groove 34a, one end of the thrust spring 36 abuts against the limit sliding block 37, the other end abuts against the bottom of the limit sliding groove 34a, the limit sliding block 37 is pushed by the elastic force of the thrust spring 36, the limit sliding block 37 always abuts against the tooth-shaped grooves 35b under the influence of no external force, and the tooth-shaped boss 37a is meshed with the tooth-shaped groove 35 b; the tooth-shaped boss 37a is movably meshed and matched with the tooth-shaped groove 35b, and the tooth-shaped boss 37a on the limiting sliding block 37 is meshed and matched with the tooth-shaped groove 35b to limit the limiting sliding block 37 to slide; a second through groove 35c matched with the adjusting rod 37b is formed in the position, corresponding to the second sliding groove 35a, of the sliding seat 35, and the adjusting rod 37b penetrates through the second through groove 35c to be exposed out of the sliding seat 35; the adjusting rod 37b is pressed to contract the thrust spring 36, the limiting sliding block 37 slides in the limiting sliding groove 34a, the tooth-shaped boss 37a is separated from the tooth-shaped groove 35b, the rectangular sliding rod 34 can slide in the second sliding groove 35a, after the required position is reached, the adjusting rod 37b is loosened to enable the tooth-shaped boss 37a to be meshed with the tooth-shaped groove 35b, and the rectangular sliding rod 34 is fixed again, so that the position of the pillow plate 5 on the back plate 4 is adjusted.

The transition plate 3 is a rectangular plate, one end of the transition plate 3 in the width direction is provided with a second hinged boss 38, the second hinged boss 38 is arranged on one side of the transition plate 3 in the thickness direction, one end of the leg pad plate 2 in the width direction is provided with a third hinged seat 39, the second hinged boss 38 is hinged to the third hinged seat 39, the second hinged boss 38 is provided with a limit step 38a, when the leg pad plate 2 rotates to the transition plate 3 and is parallel to the transition plate, the limit step 38a is abutted to the leg pad plate 2, and the maximum outward-extending angle of the leg pad plate 2 is limited.

The upper end surfaces of the seat plate 1, the leg pad plate 2, the transition plate 3, the back plate 4 and the pillow plate 5 are all provided with soft pads 41 through gluing, so that the comfort level is increased.

A cover plate 42 is arranged on one side of each of the two U-shaped support frames 6 far away from the seat plate 1 along the thickness direction, the lower end of each cover plate 42 is connected with the bottom plate 19, a soft rubber sleeve is connected between side arms of the two U-shaped support frames 6 far away from the leg pad plate 2, the lower end of each soft rubber sleeve is connected with the bottom plate 19, the upper end of each soft rubber sleeve is connected with the back plate 4, and the joint is close to the hinge joint of the back plate 4 and the seat plate 1;

in this embodiment, the soft rubber sleeve is an existing product, can be purchased directly, and has a simpler structure, so that the soft rubber sleeve is not shown in the figure.

The using process of the embodiment is as follows: when a student in a lower grade needs to lie for rest in noon break, a nurse teacher enables the student to sit on the seat board 1, the nurse teacher inputs instructions to the PLC processor 17 of each chair through the controller 18 on each chair, and the PLC processor 17 controls the height adjusting assembly, the leg pad plate rotating assembly and the back board rotating assembly to be started in a matched mode;

the two groups of height adjusting assemblies are synchronously started to enable the seat plate 1 to descend, meanwhile, the leg pad plate rotating assembly and the back plate rotating assembly are synchronously started, the leg pad plate 2, the transition plate 3 and the back plate 4 are simultaneously unfolded outwards while the seat plate 1 descends, and in the descending process of the seat plate 1, the U-shaped support frames 6 on the two sides are gradually exposed to serve as anti-falling handrails; the leg cushion plate 2 and the transition plate 3 gradually hold up the two legs of the student in the process of abduction, the two legs are positioned under the desk, the back plate 4 is unfolded outwards, the student leans back to back and lies backwards synchronously, and the student can adjust the position of the pillow plate 5 on the back plate 4 according to the height of the student.

The above embodiments are merely illustrative of the technical ideas of the present invention, and the technical ideas of the present invention and the modifications thereof based on the technical solutions are within the scope of the present invention.

Claims (10)

1. A multifunctional tablet chair for students in lower grades is characterized by comprising a seat board (1), leg cushion boards (2), a transition board (3), a back board (4), a pillow board (5), a control component, two groups of height adjusting components, one group of leg cushion board rotating components, two groups of back board rotating components and two U-shaped support frames (6), wherein the two U-shaped support frames (6) are arranged side by side and are fixedly connected through a connecting board (7), the seat board (1) is arranged on the two U-shaped support frames (6) in a sliding manner, the two groups of height adjusting components are respectively arranged on the two U-shaped support frames (6), the two groups of height adjusting components are hinged with the lower end of the seat board (1), one end of the transition board (3) along the width direction is hinged with one end of the seat board (1) along the width direction, the other end of the transition board is hinged with one end of the leg cushion board (2) along the width direction, the back board (4) is hinged with the other end of the seat board (1), the leg pad plate rotating assemblies and the two groups of back plate rotating assemblies are arranged at the lower end of the seat plate (1), the leg pad plate rotating assemblies are hinged with the leg pad plate (2), the back plate rotating assemblies are hinged with the back plate (4), and the pillow plate (5) is arranged on the back plate (4) in a sliding mode;

the two ends of the seat plate (1) in the width direction are provided with sliding bosses (1a) in an outward forming mode, each sliding boss (1a) is in sliding fit with the inner wall of the U-shaped support frame (6), one side of the lower end of each sliding boss (1a) in the length direction is provided with a first hinged support (15), and each first hinged support (15) is far away from the other first hinged support (15);

a mounting plate (8) is fixedly arranged at the middle section of each U-shaped support frame (6) along the vertical direction, and two ends of each mounting plate (8) are connected with two side walls of each U-shaped support frame (6); each mounting plate (8) is provided with a first through groove (8 a);

each group of height adjusting components comprises a first servo motor (9), a first lead screw (10), a first lead screw sliding block (11), a first bearing seat (12) and a first connecting rod (13), the first servo motor (9) and the first bearing seat (12) are fixedly arranged at the lower end of the mounting plate (8), the first servo motor (9) and the first bearing seat (12) are respectively positioned on two sides of the first through groove (8a) along the length direction, one end of a first lead screw (10) is sleeved on the first bearing seat (12), the other end of the first lead screw (10) is fixedly connected with an output shaft of the first servo motor (9) through a first shaft sleeve (14), a first lead screw sliding block (11) is arranged on the first lead screw (10) in a sliding manner, one end of a first connecting rod (13) is hinged with the first lead screw sliding block (11), and the other end of the first connecting rod (13) is hinged with a first hinge seat (15); the first servo motor (9) in each group of height adjusting assemblies is electrically connected with the control assembly;

the first connecting rod (13) penetrates through the first through groove (8a) and is in sliding fit with the side wall of the first through groove (8 a).

2. The multifunctional tablet chair for the lower-grade students according to claim 1, wherein: the control assembly comprises a lithium battery pack (16), a PLC (programmable logic controller) processor (17) and a controller (18), a bottom plate (19) is arranged between the two U-shaped support frames (6), the bottom plate (19) is close to the lower end of the U-shaped support frame (6), the lithium battery pack (16) and the PLC processor (17) are fixedly arranged on the bottom plate (19), the lithium battery pack (16) and the PLC processor (17) are electrically connected, a protection plate (20) is arranged at the upper end of each of the two U-shaped support frames (6), the controller (18) is embedded into one protection plate (20), the controller (18) and the PLC processor (17) are electrically connected, and the first servo motor (9) and the PLC processor (17) are electrically connected.

3. The multifunctional tablet chair for the lower-grade students according to claim 2, wherein: the leg pad plate rotating assembly comprises a second servo motor (21), a second lead screw (22), a second bearing seat (23), a second lead screw sliding block (24) and a second connecting rod (25), wherein the second servo motor (21) and the second bearing seat (23) are fixedly arranged at the lower end of the seat plate (1), one end of the second lead screw (22) is sleeved on the second bearing seat (23), the other end of the second lead screw (22) is fixedly connected with an output shaft of the second servo motor (21) through a second shaft sleeve (26), the second lead screw sliding block (24) is slidably arranged on the second lead screw (22), one end of the second connecting rod (25) is hinged with the lower end of the second lead screw sliding block (24), the other end of the second connecting rod (25) is hinged with a second hinged support (2a) arranged at the lower end of the leg pad plate (2), and the second hinged support (2a) is positioned at the middle section of the lower end of the leg pad plate (2), the second servo motor (21) is electrically connected with the PLC processor (17).

4. The multifunctional tablet chair for the lower-grade students according to claim 3, wherein: the second connecting rod (25) is a V-shaped rod consisting of two sections of rectangular rods, and the included angle between the two sections of rectangular rods is alpha degrees, and alpha is less than 90 < 150.

5. The multifunctional tablet chair for the lower-grade students according to claim 4, wherein: an angle limiting block (40) is arranged at the lower end of the leg pad plate (2) and corresponds to the position of the second connecting rod (25), and the angle limiting block (40) is arranged close to the second hinged support (2 a).

6. The multifunctional tablet chair for the lower-grade students according to claim 5, wherein: each group of backboard rotating assemblies comprises a third servo motor (27), an internal thread sleeve (29) and a third connecting rod (30), two first hinged bosses (31) are formed outwards at the positions, close to the lower end, of the middle sections of the backboards (4) and the lower ends, far away from the leg pad plates (2), of the seat boards (1) and hinged to the backboards (4), one ends, far away from the backboards (4), of the first hinged bosses (31) are respectively formed inwards to form rectangular notches (31a), and first sliding grooves (31b) are formed in the positions, corresponding to the rectangular notches (31a), of the first hinged bosses (31); the inner threaded sleeve (29) is a cylinder with an opening at one end, threads are arranged on the inner wall of the cylinder, a round hole is formed in the bottom end of the inner threaded sleeve (29), one end of a third connecting rod (30) penetrates through the round hole in the bottom end of the inner threaded sleeve (29) and extends into the inner threaded sleeve (29), a threaded boss (30a) is arranged at one end of the third connecting rod (30) extending into the inner threaded sleeve (29), the threaded boss (30a) is in threaded fit with the inner wall of the inner threaded sleeve (29), a hinge block (32) is arranged at the other end of the third connecting rod (30), a sliding pin shaft (33) is sleeved on the hinge block (32), the sliding pin shaft (33) is arranged in a first sliding groove (31b) in a sliding mode, the hinge block (32) is in sliding fit with a rectangular notch (31a), one end, far away from the third connecting rod (30), of the inner threaded sleeve (29) is fixedly connected with an output shaft of a third servo motor (27), the third servo motor (27) is fixedly arranged at the lower end of the seat plate (1), and the third servo motor (27) is electrically connected with the PLC processor (17).

7. The multifunctional tablet chair for the lower-grade students according to claim 1, wherein: the pillow board (5) is connected with the back board (4) through a sliding assembly; the sliding assembly comprises a rectangular sliding rod (34), a sliding seat (35), a thrust spring (36) and a limiting sliding block (37), a tooth-shaped boss (37a) is arranged at one end of the limiting sliding block (37), and an adjusting rod (37b) extends outwards from one end of the limiting sliding block (37) provided with the tooth-shaped boss (37 a); the upper end of the rectangular slide bar (34) is connected with one end of the pillow plate (5) along the thickness direction, the sliding seat (35) is arranged at one side end of the back plate (4) along the thickness direction and far away from the seat plate (1), the sliding seat (35) is provided with a second sliding groove (35a) along the length direction, a plurality of tooth-shaped grooves (35b) are formed inwards on one side wall of the second sliding groove (35a) along the thickness direction and far away from the back plate (4), the rectangular sliding rod (34) is provided with a limit sliding groove (34a) along the thickness direction in an inward molding way, the limiting slide block (37) is arranged in the limiting slide groove (34a) in a sliding way, the thrust spring (36) is arranged in the limiting slide groove (34a), one end of the thrust spring (36) is propped against the limiting slide block (37), the other end is propped against the groove bottom of the limiting slide groove (34a), the tooth-shaped boss (37a) is movably meshed and matched with the tooth-shaped groove (35 b); and a second through groove (35c) matched with the adjusting rod (37b) is formed in the position, corresponding to the second sliding groove (35a), of the sliding seat (35), and the adjusting rod (37b) penetrates through the second through groove (35c) to expose out of the sliding seat (35).

8. The multifunctional tablet chair for the lower-grade students according to claim 1, wherein: the transition plate (3) is a rectangular plate, the transition plate (3) is provided with a second hinged boss (38) along one end of the width direction, the second hinged boss (38) is arranged on one side of the transition plate (3) along the thickness direction, the pad leg plate (2) is provided with a third hinged support (39) along one end of the width direction, the second hinged boss (38) is hinged to the third hinged support (39), the second hinged boss (38) is provided with a limit step (38a), and the pad leg plate (2) rotates to the transition plate (3) and is parallel to the pad leg plate, and the limit step (38a) is abutted to the pad leg plate (2).

9. The multifunctional tablet chair for the lower-grade students according to claim 1, wherein: the upper end surfaces of the seat board (1), the leg pad boards (2), the transition board (3), the back board (4) and the pillow board (5) are all provided with soft pads (41).

10. The multifunctional tablet chair for the lower-grade students according to claim 1, wherein: one side of keeping away from bedplate (1) along thickness direction on two U-shaped support frame (6) all is equipped with apron (42), and apron (42) lower extreme links to each other with bottom plate (19), be connected with soft gum cover between the side arm of pad leg board (2) is kept away from in two U-shaped support frame (6), soft gum cover lower extreme links to each other with bottom plate (19), and soft gum cover upper end links to each other with backplate (4), and the junction is close to the articulated department of backplate (4) and bedplate (1).

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