CN112932063A - Table and chair height adjusting structure and height adjusting method - Google Patents

Abstract

The application discloses a table and chair height adjusting structure and a height adjusting method, wherein the table and chair height adjusting structure comprises telescopic legs which are respectively arranged on the left side and the right side of the bottom surface of a table top plate, or a box-type table hopper or a chair panel; the telescopic legs comprise inner legs and tubular outer legs, the upper ends of the outer legs are connected with the bottom surface of the table hopper or the bottom of the table top plate, and the upper parts of the inner legs extend into the outer legs; the outer wall of the inner leg is provided with a concave part formed by inward stamping, the concave part is stamped with a first rack, and the first rack is meshed with a synchronous gear arranged in the outer leg; the synchronous gears are connected through synchronous gear shafts to form a synchronous telescopic structure; it keeps reasonable space occupation; the structure is firm and stable, and the required weight can be borne without shaking; the failure rate is low, and the device is firm and durable; the height of the chair is convenient to adjust, the chair can be quickly positioned without tools, and the chair is particularly suitable for classroom scenes and is very suitable for the situation that students regularly rotate seats; the punch forming die is suitable for punch forming processing, can be produced in a standardized mode, is low in cost and is suitable for large-scale popularization.

Description

Table and chair height adjusting structure and height adjusting method

Technical Field

The application relates to the technical field of school supplies, in particular to a table and chair height adjusting structure and a height adjusting method.

Background

At present, most of desk and chairs used in middle and primary school schools are of fixed height, and the heights of students are different, so that the bad phenomenon of spinal curvature can occur when tall students use short desk and chair, while the short students use high desk and chair due to the fact that eyes are too close to a desktop to cause the situation of eye myopia, various unhealthy phenomena affect the healthy development of vast teenagers, in order to avoid the situation, the height-adjustable desk and chair is needed, so that students can conveniently adjust the heights of the desk and chair to proper heights according to the heights of the students, and the situation of affecting the healthy development of the teenagers is avoided.

The chinese utility model with publication number CN201640978U discloses a desk with an adjustable mechanism, wherein the adjustment is to rotate the handle at one end of the transverse connecting rod, and then the driving gear on the connecting rod drives the straight screw rod to move up and down, so as to make the desktop ascend or descend. However, the desktop can ascend and descend in a circle along the curvature of the threads, the ascending and descending can be slow, time and labor are wasted, the operation is not convenient enough, and the fast adjustment in place cannot be realized.

Chinese patent publication No. CN108783950A discloses a height adjusting mechanism driven by a rack and pinion in a sleeve, which uses a limiting block to act on a limiting hole to realize positioning. The positioning device has the defects of inconvenience, operation height and limitation, positioning can be realized only by aligning the limiting hole and the limiting block, inconvenience is caused, and quick adjustment in place cannot be realized.

Chinese utility model publication No. CN211242223U discloses an adjustable table fixed by pin shafts, wherein the height of each step of adjustment is determined by the distance between holes. Such a fixing means is inconvenient in its adjustment. Rapid in-place adjustment cannot be realized; special tools, such as wrenches, are also required for adjustment.

Therefore, in the prior art, some tables and chairs in the market are adjustable in height, but are not suitable for large-scale use in schools, and are represented by the fact that the occupied area and the volume are too large and the tables and chairs cannot be used in classrooms with compact sitting positions; or the structure of the table and chair is not firm, the bearing is too light, and even the table and chair are shaken to influence the use and are easy to damage; moreover, the height adjustment is time-consuming, troublesome and inconvenient, even special tools are needed, and the condition that the student rotates the seats regularly cannot be adapted to; in addition, the cost is high, so that the selling price is too high, and the large-scale popularization cannot be realized.

Disclosure of Invention

The application provides a height adjusting structure and a height adjusting method for a table and a chair, and aims to solve the problems that in the prior art, the occupied area and the volume are too large, the structure is not firm, the bearing is too light, even the table and the chair are shaken, the use is influenced, the table and the chair are easy to damage, and the table and the chair are not suitable for large-scale use in schools; the height adjustment is time-consuming, troublesome and inconvenient, even special tools are needed, and the seat rotation device cannot adapt to the regular seat rotation of students; and the cost is high, which causes the problems of over-high selling price, unable large-scale popularization and the like.

The utility model provides a height adjusting structure for a table and a chair, which comprises a telescopic leg respectively arranged at the left side and the right side of the bottom surface of a table top plate, a box-type table hopper or a chair panel; the telescopic legs comprise inner legs and tubular outer legs, the upper ends of the outer legs are connected with the bottom surface of the table hopper or the bottom surface of the table top plate, and the upper parts of the inner legs extend into the outer legs; the outer wall of the inner leg is provided with a concave part formed by inward stamping, the concave part is stamped with a first rack, and the first rack is meshed with a synchronous gear installed in the outer leg; synchronous gears of adjacent telescopic legs are connected through synchronous gear shafts to form a synchronous telescopic structure.

In the above scheme, preferably, the inner leg is internally provided with a gas spring, one end of the gas spring is contacted with the top surface of the table leg, and the other end of the gas spring is contacted with the movable sleeve of the caster.

It is also preferable that the inner wall of the outer leg at the first rack is provided with a first rough surface, and a positioner is arranged between the first rack and the first rough surface; the positioner comprises two second rough surfaces and an X-shaped cross structure, the X-shaped cross structure is positioned between the two second rough surfaces, and the lower parts of the second rough surfaces are respectively provided with a longitudinal sliding chute; the middle parts of the two branches of the X-shaped cross structure are connected through a middle rotating shaft, the upper ends of the two branches of the X-shaped cross structure are respectively connected with the second rough surface through an upper rotating shaft, the lower ends of the two branches of the X-shaped cross structure are respectively connected with a lower rotating shaft, and the lower rotating shafts are installed in the sliding grooves; the two second rough surfaces are respectively meshed with the first rack and the first rough surface; and a control piece is arranged on the X-shaped cross structure.

It may also be preferred that the first and second roughened surfaces are knurled or toothed surfaces.

Preferably, the height adjusting structure of the table and chair is arranged below the chair panel to form the chair, and the lower end of the gas spring in the inner leg is directly propped against the contact fixing partition plate; and a backrest is installed at the rear side of the chair panel.

Preferably, the height adjusting structure of the table and chair is arranged below the table top plate or the box-type table hopper to form the table, the bottom surface of the inner leg is provided with a hole for the caster to extend out, and the bottom of the inner leg is provided with a caster telescopic structure.

It may be also preferable that the table is provided at a side thereof with a control handle for controlling the extension and contraction of the caster, the control handle being operated such that the caster is extended to move the table; and releasing the control handle to enable the caster wheel to retract into the inner leg, so that the table is fixed.

It is also preferable that the caster telescopic structure inside the inner leg and the synchronous telescopic structure of the telescopic leg constitute an integral structure, and both share the same gas spring.

The invention also provides a height adjusting method of the table and chair height adjusting structure, which is characterized by comprising the following steps:

the first rack is meshed with the synchronous gear, and the synchronous gear shaft are rigidly connected to the adjacent first rack and the inner leg to form an inner leg synchronous telescopic structure; rotating the synchronous gear shaft to drive the synchronous gear to synchronously rotate;

the synchronous gear rotates to drive the first rack to synchronously move up and down, so that the inner leg synchronously moves up and down in the outer leg, and the height position of the desktop plate or the chair panel is adjusted.

In the above scheme, preferably, a first rough surface is arranged on the inner wall of the outer leg at the first rack, and a positioner is arranged between the first rack and the first rough surface; the positioner comprises two second rough surfaces and an X-shaped cross structure, the X-shaped cross structure is positioned between the two second rough surfaces, and the lower parts of the second rough surfaces are respectively provided with a longitudinal sliding chute; the middle parts of the two branches of the X-shaped cross structure are connected through a middle rotating shaft, the upper ends of the two branches of the X-shaped cross structure are respectively connected with the second rough surface through an upper rotating shaft, the lower ends of the two branches of the X-shaped cross structure are respectively connected with a lower rotating shaft, and the lower rotating shafts are installed in the sliding grooves; the two second rough surfaces are respectively meshed with the first rack and the first rough surface; a control part is arranged on the X-shaped cross structure;

pulling the control piece to enable the two branches of the X-shaped cross structure to rotate through the middle rotating shaft, the upper rotating shaft and the lower rotating shaft, enabling the lower ends of the two branches of the X-shaped cross structure to move in the sliding groove, achieving reduction of the whole width of the positioner, enabling the second rough surface to be separated from the first rack and the first rough surface, and enabling the inner leg to move in the outer leg;

when the control piece is loosened, under the elastic force action of the positioning spring, the two branches of the X-shaped cross structure reversely rotate through the middle rotating shaft, the upper rotating shaft and the lower rotating shaft, the lower ends of the two branches of the X-shaped cross structure reversely move in the sliding groove, the whole width of the positioner is increased, the second rough surface is in contact with the first rack and the first rough surface, and the inner leg is fixedly positioned in the outer leg.

The utility model provides a table chair height control structure and height control method can reach following beneficial effect:

the desk and chair height adjusting structure and the height adjusting method can keep reasonable volume and occupied space; the structure is very firm and stable, and the required weight can be borne without shaking; the structure is reasonable, the failure rate is low, and the structure is firm and durable; the height of the chair is very convenient to adjust, can be quickly adjusted in place, does not need any tool, is particularly suitable for classroom scenes, and is very suitable for the situation that students regularly alternate seats; the method is suitable for punch forming processing, can be used for standardized production, has low cost and low price, and is suitable for large-scale popularization.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic view of the working state of the synchronous telescopic structure of the table and chair height adjusting structure of the present application.

Fig. 2 is a schematic failure state diagram of the synchronous telescopic structure of the table and chair height adjusting structure of the present application.

Fig. 3 is a schematic view of an operating state adjusting mechanism of a synchronous telescopic structure of the table and chair height adjusting structure according to the present application.

Fig. 4 is a schematic structural view of an inner leg of a synchronous telescopic structure of the table and chair height adjusting structure of the present application.

Fig. 5 is a schematic view showing an extended state of an inner leg of the height adjusting structure of a table and chair according to the present invention.

Fig. 6 is a schematic view showing a state where the inner leg of the height adjusting structure of a table and chair of the present application is retracted.

Fig. 7 is a schematic view of a released state of the positioner of the table and chair height adjusting structure according to the present invention.

Fig. 8 is a schematic view of a positioning state of the positioner of the table and chair height adjusting structure according to the present invention.

FIG. 9 is a schematic view showing a structure of a positioner of a table and chair height adjusting structure according to the present invention having an inverted V-shape.

Fig. 10 is a schematic structural view of a table using the table and chair height adjusting structure of the present application.

Fig. 11 is a front view of a table using the table and chair height adjusting structure of the present application.

Fig. 12 is a side view showing the four extendable legs of a table using the table and chair height adjusting structure of the present application raised.

Fig. 13 is a side view of two telescopic leg tables using the table and chair height adjusting structure of the present invention.

Fig. 14 is a structural view of a synchronizing gear shaft of a table or a chair using the table and chair height adjusting structure of the present invention.

Fig. 15 shows a caster extending/retracting mechanism of the table/chair height adjusting structure according to the present invention.

In the drawing, 1 is a table top, 2 is a table hopper, 201 is a tamarix chinensis between legs, 3 is an outer leg, 301 is a telescopic leg, 4 is an inner leg, 5 is a first rack, 6 is a synchronizing gear, 7 is a synchronizing gear shaft, 701 is a synchronizing shaft slide rail, 702 is a synchronizing shaft slide block, 703 is a synchronizing shaft position adjusting screw, 8 is a guide support ring, 9 is a first rough surface, 10 is a positioner, 101 is a positioning spring, 102 is a top end spring, 11 is a second rough surface, 12 is a chute, 13 is a middle rotating shaft, 14 is an upper rotating shaft, 15 is a lower rotating shaft, 16 is a control member, 161 is a control wire core, 162 is a control wire sleeve, 17 is a top rotating shaft, 18 is a gas spring, 19 is an heightening handle, 20 is a caster, 21 is a movable sleeve, 22 is an arm bottom, 23 is a control spring, and 24 is a fixed partition plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Example 1

As shown in fig. 1 and 2, a table and chair height adjusting structure includes telescopic legs 301 respectively installed at the left and right sides of the bottom surface of a table top plate 1, or a box-type table bucket 2, or a chair top plate; the table is characterized in that the telescopic legs 301 comprise inner legs 4 and tubular outer legs 3, the upper ends of the outer legs 3 are connected with the bottom surface of the table hopper 2 or the bottom surface of the table top plate 1, and the upper parts of the inner legs 4 extend into the outer legs 3; the outer wall of the inner leg 4 is provided with a concave part formed by inward stamping, the concave part is stamped with a first rack 5, and the first rack 5 is meshed with a synchronous gear 6 arranged in the outer leg 3; the synchronous gears 6 of the adjacent telescopic legs 301 are connected through a synchronous gear shaft 7 to form a synchronous telescopic structure.

As shown in fig. 3, as another specific embodiment, a tamarix chinensis 201 between legs may be connected between the telescopic legs 301, a synchronizing shaft slide rail 701 may be disposed on the tamarix chinensis 201 between legs, a synchronizing shaft slide block 702 is installed in the synchronizing shaft slide rail 701, and a synchronizing gear shaft 7 passes through a synchronizing gear shaft hole on the synchronizing shaft slide block 702; synchronous gear shaft 7 and synchronous shaft slider 702 are provided with synchronous shaft position adjusting screw holes, and synchronous shaft position adjusting screws 703 are provided in the synchronous shaft position adjusting screw holes.

In addition, the inner legs 4 of the two legs at the rear side may have two punched recesses, that is, the two punched recesses have two first racks 5 punched thereon, and each punched recess has two synchronizing gears 6 and synchronizing gear shafts 7 connected to the two inner legs 4.

Example 2

As shown in fig. 4 to 6, a table and chair height adjusting structure is similar to that of embodiment 1 except that a gas spring 18 is installed in an inner leg 4, one end of the gas spring 18 contacts the top surface of the table leg, and the other end of the gas spring 18 contacts a movable sleeve 21 of a caster 20.

Further, a guide support ring 8 is arranged on the inner leg 4, and the guide support ring 8 is positioned in the gap between the outer leg 3 and the inner leg 4.

Wherein, the right side of figure 4 is the top of the inner leg 4, and the left side is the extending end of the inner leg 4.

As shown in fig. 7 and 8, further, a first rough surface 9 is provided on the inner wall of the outer leg 3 at the first rack 5, and a locator 10 is provided between the first rack 5 and the first rough surface 9; the positioner 10 comprises two second rough surfaces 11 and an X-shaped cross structure, the X-shaped cross structure is positioned between the two second rough surfaces 11, and the lower parts of the second rough surfaces 11 are respectively provided with a longitudinal sliding chute 12; the middle parts of the two branches of the X-shaped cross structure are connected through a middle rotating shaft 13, the upper ends of the two branches of the X-shaped cross structure are respectively connected with the second rough surface 11 through an upper rotating shaft 14, the lower ends of the two branches of the X-shaped cross structure are respectively connected with a lower rotating shaft 15, and the lower rotating shafts 15 are arranged in the sliding grooves 12; the two second rough surfaces 11 are respectively meshed with the first rack 5 and the first rough surface 9; the X-shaped cross structure is provided with a control piece 16.

Further, a positioning spring 101 is connected between the upper ends or the lower ends of the two branches of the X-shaped cross structure of the positioner 10, and the positioning spring 101 is wound on the middle rotating shaft 13.

As shown in fig. 9, further, the upper end of the X-shaped cross structure is connected with an inverted V-shaped structure, and the upper ends of the two branches of the inverted V-shaped structure are connected through a top rotating shaft 17; the lower ends of the two branches of the inverted V-shaped structure are respectively connected with the upper rotating shaft 14, and the control part 16 is connected on the inverted V-shaped structure and the X-shaped cross structure.

The further first rough surface 9 and the second rough surface 11 are knurled or toothed surfaces.

As shown in fig. 10 to 13, the table using the table and chair height adjusting structure of the above embodiment may include a table top plate 1, a table hopper 2 may be disposed under the table top plate 1, and the table and chair height adjusting structure of the above embodiment may be mounted on a bottom surface of the table hopper 2. In which the table shown in fig. 11 to 13 is mounted with four telescopic legs 301 having the above-described table and chair height adjusting structure. The table shown in fig. 13 is provided with two extendable legs 301 having the above-described table and chair height adjusting structure.

Fig. 14 is a structural view of a synchronizing gear shaft of a table or chair having a table and chair height adjusting structure according to the present invention, and an upper portion of fig. 14 shows a rear side of the table or chair.

As shown in fig. 4, the inner leg 4 is provided with a guide support ring 8, the guide support ring 8 being located in the gap between the outer leg 3 and the inner leg 4. The number of the guide support rings 8 may be two, and may be provided at upper and lower portions of the inner leg 4, respectively. The shape of the guide support ring 8 is matched with the shapes of the outer leg 3 and the inner leg 4, and if the outer leg 3 and the inner leg 4 are rectangular columns, the guide support ring 8 is a rectangular ring; if the outer leg 3 and the inner leg 4 are cylindrical, the guide support ring 8 is a circular ring. The guiding support ring 8 may be provided with notches at the first rack 5 and the first rough surface 9 of the inner leg 4 and the outer leg 3 to facilitate assembly.

As shown in fig. 7 and 8, when the positioner 10 includes an X-shaped cross structure, the control member 16 may be mounted on the lower rotating shaft 15.

As shown in fig. 9, when the upper end of the X-shaped cross structure is connected with the inverted V-shaped structure, the control member 16 may be installed on the top rotating shaft 17 and the middle rotating shaft 13. And the positioning spring 101 can be sleeved outside the control member 16 between the top end of the control member 16 and the top rotating shaft 17, and the top end of the control member 16 can be connected with a baffle plate to block the upper end of the positioning spring 101. The detent spring 101 allows the detent 10 to return to the detent position when the handle is released.

In fig. 9, the control member 16 may be a control wire with a top spring 102 at the top end of the control wire for adjusting the force dampening of the control handle.

In the table using the table and chair height adjusting structure of the present invention, a height adjusting handle 19 may be mounted at a lower portion of the table bucket 2, a lower portion of the table top plate 1 at a side of the table, or a side of the table bucket 2. The height-adjusting handle 19 is connected to a control member 16, and the control member 16 may be a pull rope or a control wire. When the height-adjusting handle 19 is pressed, the positioner 10 is released from positioning, the height can be conveniently and freely adjusted under the compensation of the gas spring 18, and the positioner can be positioned by releasing the height-adjusting handle 19 when the proper height is reached.

The relative positions of the inner leg 4 and the outer leg 3 can be positioned and fixed by the positioner 10. The positioner 10 can be controlled by a control line, the control line can comprise a control line sleeve 162 and a control line core 161, the control line sleeve 162 is sleeved outside the control line core 161, and the control line core 161 is connected with the pressing heightening handle 19; when the height-adjusting handle 19 is pressed, the control wire core 161 is pulled out for a certain length, the retainer 10 fixed on the control wire core 161 is deformed and narrowed by the connecting rod, and is separated from the first rack 5 and the first rough surface 9 opposite to the inner leg 4 and the outer leg 3, and then the inner leg 4 can move up and down freely. After the height-adjusting handle 19 is loosened, the positioner 10 deforms and widens under the action of the positioning spring 101, one side of the positioner contacts and abuts against the first rack 5 on the inner leg 4, and the other side of the positioner contacts and abuts against the first rough surface 9 on the inner wall of the outer leg 3, so that the inner leg 4 and the outer leg 3 are closely positioned, the inner leg 4 can not do telescopic motion any more, and the positioning effect is achieved.

The chair height adjusting structure is arranged below the chair panel to form a chair, and the chair adopting the chair height adjusting structure can be used for adjusting the lower part of the inner leg 4 of the chair without a whole set of telescopic mechanism of a caster 20, and the lower end of the air spring 18 in the inner leg 4 is directly propped against the contact fixed partition plate 24. Then a backrest is installed on the rear side of the chair panel.

The inner wall of the outer leg 1 is smooth and can be coated with lubricating grease, and the inner leg 4 can smoothly slide up and down in the outer leg 3 under the cooperation of the guide support ring 8, so as to form the telescopic action of the telescopic leg 301. The guide support ring 8 is located between the gaps of the inner leg 4 and the outer leg 3, so that direct friction between the metal materials of the inner leg 4 and the outer leg 3 can be avoided, and the inner leg 4 can be prevented from shaking in the outer leg 3, thereby having a guiding effect. A first rack 5 is stamped on one part of the inner leg 4, the first rack 5 is matched with a synchronous gear 6, a synchronous gear shaft 7 is arranged at the center of the synchronous gear 6, and the same synchronous gear shaft 7 is connected between the synchronous gears 6 of two adjacent telescopic legs 301 according to the number of the telescopic legs 301. Specifically, the following steps can be performed: the table or the chair adopting the table and chair height adjusting structure can be provided with four telescopic legs 301, and then can be formed by sequentially connecting a synchronous gear shaft 7 between a left rear leg and a left front leg, a left front leg and a right front leg of the table or the chair and a right front leg respectively, namely the four telescopic legs 301 are sequentially connected through three synchronous gear shafts 7 to form a synchronous telescopic structure. As shown in fig. 14. The table or the chair adopting the table and chair height adjusting structure can also be provided with two telescopic legs 301 on the left side and the right side, the bottoms of the telescopic legs 301 can be respectively connected with bottom support arms 22, and the length direction of the bottom support arms 22 is consistent with the length direction of the left side and the right side of the table top plate 1 or the chair panel. The synchronous telescopic structure can be formed by the synchronous gear shaft 7 connected between the left telescopic leg 301 and the right telescopic leg 301, that is, the two telescopic legs 301 are connected through one synchronous gear shaft 7 to form the synchronous telescopic structure.

As shown in fig. 15, the height adjusting structure of the table and chair is installed under the table top 1 or the box-type table bucket 2 to form a table, the bottom surface of the inner leg 4 is provided with a hole for the caster 20 to extend out, and the bottom inside the inner leg 4 is provided with a telescopic structure of the caster 20. The side of the table is provided with a control handle for controlling the extension and contraction of the caster 20, and the control handle is operated to extend the caster 20 so as to move the table; the control handle is released so that the castor 20 is retracted inside the inner leg 4, immobilizing the table. The telescopic structure of the caster 20 inside the inner leg 4 and the synchronous telescopic structure of the telescopic leg 301 form an integral structure, namely, one set of spring mechanism can realize the extension and contraction of the table leg and the caster 20, and the two share the same gas spring 18. The two telescopic legs 301 share one gas spring 18, the elastic force of the gas spring 18 is set to be larger than the force required by the telescopic legs, namely when the height-adjusting handle 19 is pressed, the elastic force of the gas spring 18 is larger than the weight of the empty table, so that the empty table can slightly rise; when stationery such as a schoolbag and a book is placed in the table hopper 2, the elastic force of the air spring 18 and the total weight of the stationery such as the table and the schoolbag are basically balanced, at the moment, a person can freely adjust the height of the table, or lift or press the table top, so that the height of the table can quickly reach the required height, and the height can be adjusted and well fixed by loosening the height adjusting handle 19. The extending structure of the caster 20 is provided with a control spring 23 which cooperates with the gas spring 18 to generate elastic force which is larger than the total weight of accessories such as tables, common schoolbag and the like, and the caster 20 extends out after the caster 20 is operated to extend out of the handle; releasing the caster 20 controls the handle and the caster 20 retracts inside the inner leg 4.

Example 3

The height adjusting method of the table and chair height adjusting structure according to any one of the embodiments includes the following steps:

the first rack 5 is meshed with the synchronous gear 6, and the synchronous gear 6 and the synchronous gear shaft 7 are rigidly connected to the adjacent first rack 5 and the inner leg 4 to form a synchronous telescopic structure of the inner leg 4; the rotating synchronous gear shaft 7 drives the synchronous gear 6 to synchronously rotate;

the synchronous gear 6 rotates to drive the first rack 5 to synchronously move up and down, so that the inner leg 4 synchronously moves up and down in the outer leg 3, and the height position of the desktop board 1 or the chair panel is adjusted.

Example 4

The height adjustment method of the table and chair height adjustment structure according to embodiment 3 may further include the steps of:

a first rough surface 9 is arranged on the inner wall of the outer leg 3 at the position of the first rack 5, and a positioner 10 is arranged between the first rack 5 and the first rough surface 9; the positioner 10 comprises two second rough surfaces 11 and an X-shaped cross structure, the X-shaped cross structure is positioned between the two second rough surfaces 11, and the lower parts of the second rough surfaces 11 are respectively provided with a longitudinal sliding chute 12; the middle parts of the two branches of the X-shaped cross structure are connected through a middle rotating shaft 13, the upper ends of the two branches of the X-shaped cross structure are respectively connected with the second rough surface 11 through an upper rotating shaft 14, the lower ends of the two branches of the X-shaped cross structure are respectively connected with a lower rotating shaft 15, and the lower rotating shafts 15 are arranged in the sliding grooves 12; the two second rough surfaces 11 are respectively meshed with the first rack 5 and the first rough surface 9; a control part 16 is arranged on the X-shaped cross structure;

pulling the control member 16 so that the two branches of the X-shaped cross structure rotate through the middle rotating shaft 13, the upper rotating shaft 14 and the lower rotating shaft 15 and so that the lower ends of the two branches of the X-shaped cross structure move in the sliding grooves 12, resulting in the reduction of the overall width of the positioner 10, so that the second rough surface 11 is separated from the first rack 5 and the first rough surface 9, so that the inner leg 4 moves in the outer leg 3;

when the control member 16 is released, the two branches of the X-shaped cross structure are reversely rotated by the middle rotating shaft 13, the upper rotating shaft 14 and the lower rotating shaft 15 under the elastic force of the positioning spring 101, and the lower ends of the two branches of the X-shaped cross structure are reversely moved in the sliding groove 12, so that the overall width of the positioner 10 is increased, the second rough surface 11 is in contact with the first rack 5 and the first rough surface 9, and the inner leg 4 is fixedly positioned in the outer leg 3.

The desk and chair height adjusting structure and the height adjusting method of the embodiment, and the desk and the chair adopting the desk and chair height adjusting structure and the height adjusting method can protect the eyesight of students and avoid strabismus or neck health, and students often sit in different longitudinal rows in a classroom by turns according to the circumference. For students who often need to take seat turns in a classroom, the height of the desk can be quickly adjusted in place, and the desk can be used by hands without any tools, so that the convenience in use is improved, and the desk is beneficial for the students to use more energy for learning. The desk and the chair which are easy to adjust can avoid that students with weak physical strength can not adjust the desk sitting on the desk to a proper height by hands, and the integral harmonious and ordered appearance of the class is improved. The elevation structure and the locate mode that it adopted are all different with traditional prior art, and its unique flexible leg 301 structure makes things convenient for synchronous extending structure work, and the fixed power that its high locate mode provided is bigger, avoids producing and rocks, avoids rocking because the tolerance between round pin and the hole arouses among the prior art with hole round pin location rocks, guarantees its altitude mixture control location back overall structure sturdiness.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A height adjusting structure for a table and a chair comprises telescopic legs (301) which are respectively arranged at the left side and the right side of the bottom surface of a table top plate (1), or a box-type table bucket (2) or a chair panel; the table is characterized in that the telescopic legs (301) comprise inner legs (4) and tubular outer legs (3), the upper ends of the outer legs (3) are connected with the bottom surface of the table hopper (2) or the bottom surface of the table top plate (1), and the upper parts of the inner legs (4) extend into the outer legs (3); the outer wall of the inner leg (4) is provided with a concave part formed by inward stamping, the concave part is stamped with a first rack (5), and the first rack (5) is meshed with a synchronous gear (6) arranged in the outer leg (3); synchronous gears (6) of adjacent telescopic legs (301) are connected through a synchronous gear shaft (7) to form a synchronous telescopic structure.

2. The table and chair height adjusting structure according to claim 1, wherein the inner leg (4) is installed with a gas spring (18), one end of the gas spring (18) contacts the top surface of the table leg, and the other end of the gas spring (18) contacts the movable sleeve (21) of the caster (20).

3. The table and chair height adjusting structure according to claim 1, wherein a first rough surface (9) is provided on the inner wall of the outer leg (3) at the first rack (5), and a locator (10) is provided between the first rack (5) and the first rough surface (9); the positioner (10) comprises two second rough surfaces (11) and an X-shaped cross structure, the X-shaped cross structure is positioned between the two second rough surfaces (11), and the lower parts of the second rough surfaces (11) are respectively provided with a longitudinal sliding groove (12); the middle parts of the two branches of the X-shaped cross structure are connected through a middle rotating shaft (13), the upper ends of the two branches of the X-shaped cross structure are respectively connected with the second rough surface (11) through an upper rotating shaft (14), the lower ends of the two branches of the X-shaped cross structure are respectively connected with a lower rotating shaft (15), and the lower rotating shaft (15) is arranged in the sliding chute (12); the two second rough surfaces (11) are respectively meshed with the first rack (5) and the first rough surface (9); and a control part (16) is arranged on the X-shaped cross structure.

4. A table and chair height adjustment structure as claimed in claim 3, wherein the first roughened surface (9) and the second roughened surface (11) are knurled or toothed surfaces.

5. A table and chair height adjusting structure as claimed in claim 3, wherein the table and chair height adjusting structure is installed under the seat panel to constitute a chair, and the lower end of the gas spring (18) in the inner leg (4) is directly abutted against the contact fixing partition plate (24); and a backrest is installed at the rear side of the chair panel.

6. The structure for adjusting the height of the table and the chair as claimed in claim 1, wherein the structure for adjusting the height of the table and the chair is installed under a table top (1) or a box-type table bucket (2) to form the table, the bottom surface of the inner leg (4) is provided with a hole for the caster (20) to extend out, and the inner bottom of the inner leg (4) is provided with a telescopic structure of the caster (20).

7. The table and chair height adjusting structure as claimed in claim 6, wherein the table is provided at a side thereof with a control handle for controlling the extension and contraction of the caster (20), and the control handle is operated so that the caster (20) is extended to move the table; releasing the control handle to enable the caster wheel (20) to retract into the inner leg (4) to fix the table.

8. The table and chair height adjustment structure according to claim 6, characterized in that the telescopic structure of the caster (20) inside the inner leg (4) and said synchronous telescopic structure of the telescopic leg (301) constitute an integral structure, both sharing the same gas spring (18).

9. A height adjusting method of a table and chair height adjusting structure as set forth in any one of claims 1 to 8, comprising the steps of:

the first rack (5) is meshed with the synchronous gear (6), and the synchronous gear (6) and the synchronous gear shaft (7) are rigidly connected to the adjacent first rack (5) and the inner leg (4) to form a synchronous telescopic structure of the inner leg (4); the synchronous gear shaft (7) is rotated to drive the synchronous gear (6) to synchronously rotate;

the synchronous gear (6) rotates to drive the first rack (5) to synchronously move up and down, so that the inner leg (4) synchronously moves up and down in the outer leg (3), and the height position of the table top plate (1) or the chair top plate is adjusted.

10. The height adjusting method of a table and chair height adjusting structure according to claim 9, wherein a first rough surface (9) is provided on an inner wall of the outer leg (3) at the first rack (5), and a locator (10) is provided between the first rack (5) and the first rough surface (9); the positioner (10) comprises two second rough surfaces (11) and an X-shaped cross structure, the X-shaped cross structure is positioned between the two second rough surfaces (11), and the lower parts of the second rough surfaces (11) are respectively provided with a longitudinal sliding groove (12); the middle parts of the two branches of the X-shaped cross structure are connected through a middle rotating shaft (13), the upper ends of the two branches of the X-shaped cross structure are respectively connected with the second rough surface (11) through an upper rotating shaft (14), the lower ends of the two branches of the X-shaped cross structure are respectively connected with a lower rotating shaft (15), and the lower rotating shaft (15) is arranged in the sliding chute (12); the two second rough surfaces (11) are respectively meshed with the first rack (5) and the first rough surface (9); a control part (16) is arranged on the X-shaped cross structure;

pulling a control piece (16) to enable the two branches of the X-shaped cross structure to rotate through a middle rotating shaft (13), an upper rotating shaft (14) and a lower rotating shaft (15) and enable the lower ends of the two branches of the X-shaped cross structure to move in a sliding groove (12), so that the whole width of the positioner (10) is reduced, the second rough surface (11) is separated from the first rack (5) and the first rough surface (9), and the inner leg (4) moves in the outer leg (3);

when the control piece (16) is loosened, under the action of the elastic force of the positioning spring (101), the two branches of the X-shaped cross structure reversely rotate through the middle rotating shaft (13), the upper rotating shaft (14) and the lower rotating shaft (15), and the lower ends of the two branches of the X-shaped cross structure reversely move in the sliding groove (12), so that the whole width of the positioner (10) is increased, the second rough surface (11) is in contact with the first rack (5) and the first rough surface (9), and the inner leg (4) is fixedly positioned in the outer leg (3).

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