Control adjusting structure and dental chair

Abstract

The utility model provides a control adjusting structure and a dental chair. The dental chair comprises a base, a chair seat, a chair back and an instrument arm, wherein the chair seat, the chair back and the instrument arm are arranged on the base; the control adjusting structure comprises a control switch, the control switch comprises a rocker handle, the rocker handle can be arranged on the instrument arm in a relative deflection mode, or the rocker handle is provided with a deflector rod which can deflect relative to the rocker handle; and the rocker handle or the deflector rod deflects to control the chair seat to ascend or descend relative to the base and control the angle between the chair back and the chair seat to be reduced or increased. According to the control adjusting structure and the dental chair, the operation process can be simplified, and an operator can use the dental chair more conveniently and rapidly and control the dental chair conveniently.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a control and adjustment structure and a dental chair. Background Art

[0002] A dental chair is a medical device for oral surgery and the examination and treatment of oral diseases. Currently, most dental chairs are electric dental chairs, whose whole machine and base plate are fixed to the ground, and various adjustments of the dental chair are carried out through a control system to facilitate the operation of dentists.

[0003] At present, most dental chairs need to adjust the lifting of the seat and the pitching angle of the backrest. At the same time, the position of the robotic arm also needs to be controlled. Most of the control and adjustment structures in the prior art realize the position adjustment of the seat, backrest and robotic arm by setting multiple switches such as keys and buttons on the robotic arm, which makes it inconvenient for doctors to operate. They need to operate multiple times and are not convenient for one-handed operation. Summary of the Invention

[0004] Based on this, the present application provides a control and adjustment structure and a dental chair to solve the problem of inconvenient adjustment operation of dental chairs in the prior art.

[0005] To achieve the above object, the technical solution of the embodiment of the present application is realized as follows:

[0006] On the one hand, the embodiment of the present application provides a control and adjustment structure for a dental chair. The dental chair includes a base and a seat, a backrest and a robotic arm provided on the base; the control and adjustment structure includes a control switch, and the control switch includes a rocker handle, the rocker handle is provided on the robotic arm so as to be relatively swingable, or a lever swingable relative to the rocker handle is provided on the rocker handle; the swing of the rocker handle or the lever is used to control the rise or fall of the seat relative to the base, and to control the decrease or increase of the angle between the backrest and the seat.

[0007] In one embodiment, the control switch further includes a rocker contact provided in the rocker handle, and first, second, third and fourth contacts provided around the rocker contact. The control switch is configured as follows: when the rocker contact contacts the first contact, it is used to make the seat rise relative to the base; when the rocker contact contacts the second contact, it is used to make the seat fall relative to the base; when the rocker contact contacts the third contact, it is used to make the upper end of the backrest move towards the direction close to the seat; when the rocker contact contacts the fourth contact, it is used to make the upper end of the backrest move away from the seat.

[0008] In one embodiment, the rocker contact is connected to the lower end of the rocker handle, and the first contact, the second contact, the third contact, and the fourth contact are respectively arranged in one of the front, rear, left, and right directions relative to the rocker contact. Rocking the rocker handle is used to drive the rocker contact to contact the first contact, the second contact, the third contact, or the fourth contact respectively;

[0009] Alternatively, the rocker contact is arranged at the upper end of the rocker handle, the shift lever is connected to the rocker contact, the upper end of the shift lever extends outside the rocker handle, the first contact, the second contact, the third contact, and the fourth contact are respectively located inside the rocker handle, and are respectively arranged in one of the front, rear, left, and right directions relative to the rocker contact. Pushing the shift lever is used to drive the rocker contact to contact the first contact, the second contact, the third contact, or the fourth contact respectively.

[0010] In one embodiment, the control and adjustment structure further includes a fifth contact, the fifth contact is arranged below the rocker contact, and a button is further arranged on the rocker handle. Pressing the button is used to make the rocker contact and the fifth contact contact, so as to release the braking of the instrument arm.

[0011] In one embodiment, the control and adjustment structure further includes a brake assembly arranged inside the instrument arm, and the brake assembly includes a control valve and a brake cylinder assembly; the contact between the rocker contact and the fifth contact is used to close the control valve, thereby controlling the brake disc of the brake cylinder assembly to retract, so that the instrument arm is released from braking.

[0012] In one embodiment, the control and adjustment structure further includes a seat motor and a backrest motor; the contact between the rocker contact and the first contact is used to control the push rod of the seat motor to extend, so that the seat rises relative to the base; the contact between the rocker contact and the second contact is used to control the push rod of the seat motor to retract, so that the seat descends relative to the base; the contact between the rocker contact and the third contact is used to control the push rod of the backrest motor to retract, so that the included angle between the backrest and the seat becomes smaller; the contact between the rocker contact and the fourth contact is used to control the push rod of the backrest motor to extend, so that the included angle between the backrest and the seat becomes larger.

[0013] In one embodiment, the control and adjustment structure further includes a control box disposed on the instrument arm. The control switch is disposed on the control box, and there are also 4 key switches on the control box. The first key switch is used to control the raising of the seat, the second key switch is used to control the lowering of the seat, the third key switch is used to decrease the angle between the backrest and the seat, and the fourth key switch is used to increase the angle control between the backrest and the seat.

[0014] In one embodiment, the control and adjustment structure further includes a foot switch disposed on the base. The foot switch includes a foot contact, a sixth contact, a seventh contact, an eighth contact, and a ninth contact. When the foot contact touches the sixth contact, it is used to control the push rod of the seat motor to extend, so that the seat rises relative to the base. When the foot contact touches the seventh contact, it is used to control the push rod of the seat motor to retract, so that the seat descends relative to the base. When the foot contact touches the eighth contact, it is used to control the push rod of the backrest motor to retract, so that the included angle between the backrest and the seat becomes smaller. When the foot contact touches the ninth contact, it is used to control the push rod of the backrest motor to extend, so that the included angle between the backrest and the seat becomes larger.

[0015] In one embodiment, the seat motor and the backrest motor each include an electric push rod.

[0016] On the other hand, an embodiment of the present application provides a dental chair, including the control and adjustment structure as described above.

[0017] The present application has at least the following beneficial effects: The control and adjustment structure provided by the embodiment of the present application includes a control switch with a rocker. The operator can respectively realize the raising of the seat, the lowering of the seat, decreasing the angle between the backrest and the seat, or increasing the angle between the backrest and the seat by shaking the control switch, which greatly improves the convenience of operating and adjusting the dental chair, enabling the operator to complete the above various control actions by holding the control switch with one hand. The dental chair of the embodiment of the present application includes the above control and adjustment structure, so it also has the above beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the dental chair according to the embodiment of the present application (the arrow direction in the figure is the movement direction of each component).

[0019] Figure 2 is Figure 1 a schematic diagram of the position of the internal components of the dental chair.

[0020] Figure 3 is Figure 2 an enlarged schematic diagram of the structure at A of.

[0021] Figure 4 This is a schematic structural diagram of the control circuit of the control switch according to an embodiment of the present application.

[0022] Figure 5 This is a schematic structural diagram of the rocker contact and contacts (first contact, second contact, third contact, and fourth contact) according to an embodiment of the present application.

[0023] The meanings of the reference numerals in the drawings are as follows:

[0024] 1. Base; 2. Seat; 3. Backrest; 4. Instrument arm; 41. Mounting seat; 42. First instrument arm; 411. First arm body; 412. Second arm body; 43. Second instrument arm; 5. Headrest; 6. Lighting lamp; 7. Control switch; 71. Button; 72. Rocker handle; 721. Rocker contact; 722. First contact; 723. Second contact; 724. Third contact; 725. Fourth contact; 8. Control box; 9. Foot switch; 10. Brake assembly; 101. Air source; 102. Relay; 103. Control valve; 104. Brake cylinder assembly; 1041. Brake disc; 11. Backrest motor; 12. Seat motor; 13. Signal conversion board; 14. Motor drive board. Detailed implementation manners

[0025] The technical solution of the present application will be further elaborated in detail below with reference to the accompanying drawings of the specification and specific embodiments.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application. In the description of this application, unless otherwise stated, the meaning of "plurality" is two or more.

[0028] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] Please refer to Figure 1 , the dental chair according to the embodiment of the present application includes a base 1, a seat 2, a backrest 3, an instrument arm 4, a headrest 5, a lighting lamp 6, and a control and adjustment structure. The base 1 is used for fixedly connecting with the ground. The seat 2 is installed on the base 1 and can rise or fall relative to the base 1. The backrest 3 is installed at the end of the seat 2 and serves as the backrest of the user. The pitching angle of the backrest 3 relative to the seat 2 is adjustable so that the user can present different sitting and lying postures, facilitating the operator to perform operations such as inspection and treatment on the user. The instrument arm 4 is installed on the base 1, and the instrument arm 4 can rise or fall to adjust the positional relationship with the seat 2.

[0030] Specifically, as Figure 1 and Figure 2 shown, for example, the instrument arm 4 may further include a first instrument arm 42 and a second instrument arm 43. An installation seat 41 can be provided. The installation seat 41 is fixedly connected with the base 1, and each instrument arm 4 is respectively rotatably connected with the installation seat 41. The first instrument arm 42 of this embodiment includes a first arm body 411 and a second arm body 412. The two ends of the first arm body 411 are respectively rotatably connected with the installation seat 41 and the second arm body 412. One end of the second arm body 412 is rotatably connected with the first arm body 411. At the same time, the second arm body 412 can rotate around a plurality of connection points with the second arm body 412 in the horizontal or vertical direction to adjust the relative positional relationship with the first arm body 411. At least part of the control and adjustment structure is installed on the first instrument arm 42. The second instrument arm 43 is similar in structure to the first instrument arm 42, and the distance between it and the seat 2 is greater than the distance between the first instrument arm 42 and the seat 2. The movable end of the first instrument arm 42 is used for installing the lighting lamp 6, facilitating the operator to use and observe.

[0031] The control and adjustment structure of this embodiment includes a control switch 7, which is arranged on the instrument arm 4 and includes a rocker handle 72. The rocker handle 72 can swing relative to the instrument arm 4 or there is a lever (not shown) on the rocker handle 72 that can swing relative to the rocker handle. The swinging of the rocker handle 72 or the lever is used to respectively control the rising of the seat 2 relative to the base 1, the descending of the seat 2 relative to the base 1, the reduction of the angle between the backrest 3 and the seat 2, or the increase of the angle between the backrest 3 and the seat 2. Specifically, the control and adjustment structure may further include a control box 8, which is rotatably connected to the end of the second arm body 412 away from the first arm body 411. When the braking of the instrument arm 4 is released, the relative position of the second arm body 412 can be adjusted by pushing or pulling the control box 8. The rocker handle 72 can be arranged outside the control box 8 for easy operation. A bracket for placing a dental handpiece can also be arranged at the front end of the control box 8 for easy placement of the dental handpiece.

[0032] The control switch 7 with five contacts or four contacts can be selected according to actual needs to achieve different control functions.

[0033] For example, in some embodiments, the control switch 7 includes a rocker handle 72 and a rocker contact 721, a first contact 722, a second contact 723, a third contact 724, a fourth contact 725 and a fifth contact arranged in the rocker handle 72. Among them, holding and operating the rocker handle 72 to make the rocker contact 721 contact the first contact 722 can be used to make the seat 2 rise relative to the base 1; holding and operating the rocker handle 72 to make the rocker contact 721 contact the second contact 723 can be used to make the seat 2 descend relative to the base 1; holding and operating the rocker handle 72 to make the rocker contact 721 contact the third contact 724 can be used to make the upper end of the backrest 3 move towards the seat 2 (the reduction of the angle between the backrest 3 and the seat 2); holding and operating the rocker handle 72 to make the rocker contact 721 contact the fourth contact 725 can be used to make the upper end of the backrest 3 move away from the seat 2 (the increase of the angle between the backrest 3 and the seat 2); holding and operating the rocker handle 72 to make the rocker contact 721 contact the fifth contact (not shown) can be used to release the braking of the instrument arm 4. For example, the rocker contact 721 can be connected to the lower end of the vertically arranged rocker handle 72, and the first contact 722, the second contact 723, the third contact 724 and the fourth contact 725 are respectively arranged behind, in front of, to the right of, and to the left of the rocker contact 721. By pushing the rocker handle 72 in the forward, backward, left, and right directions respectively, the rocker contact 721 contacts the first contact 722, the second contact 723, the third contact 724 and the fourth contact 725 respectively to achieve the above control actions.

[0034] In other embodiments, the rocker handle 72 can be fixedly set on the instrument arm 4, the rocker contact 721 is set at the upper end of the rocker handle 72, the rocker contact 721 is connected to the lever, the upper end of the second contact 723 lever extends out of the second contact 723 rocker handle 72, the second contact 723 first contact 722, the second contact 723 second contact 723, the second contact 723 third contact 724 and the second contact 723 fourth contact 725 are separated. They are respectively located in the second contact 723 rocker handle 72, and are respectively set at one of the front, rear, left and right sides relative to the second contact 723 rocker contact 721. Moving the second contact 723 lever is used to drive the second contact 723 rocker contact 721 to contact the second contact 723 first contact 722, the second contact 723 second contact 723, the second contact 723 third contact 724 or the second contact 723 fourth contact 725 respectively.

[0035] Specifically, the rocker contact 721 may include one rocker contact or multiple rocker contacts. When there are multiple rocker contacts, all of the multiple rocker contacts are set to be conductive. For example, the first contact 722, the second contact 723, the third contact 724 and the fourth contact 725 surround a rocker contact in the middle, and the rocker contact is respectively in contact with the side wall of the first contact 722, the second contact 723, the third contact 724 or the fourth contact 725 to achieve the corresponding control function. Or, as Figure 5 As shown, the four rocker contacts are respectively arranged above the first contact 722, the second contact 723, the third contact 724 or the fourth contact 725. When the rocker handle 72 or the lever is tilted, one of the rocker contacts tilts downward and contacts with the corresponding first contact 722, the second contact 723, the third contact 724 or the fourth contact 725 to realize the corresponding control function.

[0036] like Figure 3 As shown, a downwardly pressed button 71 can also be provided on the top of the rocker handle 72. Pressing the button 71 can make the rocker contact 721 contact with the fifth contact below to achieve the above control action. The rocker contact 721 contacts the fifth contact to control the brake release of the instrument arm 4. The operator can complete all the above control actions with one hand during operation, which is very convenient. The positions of the first contact 722, the second contact 723, the third contact 724, the fourth contact 725 and the fifth contact relative to the rocker contact 721 are taken as examples. Each contact can be set at the front, back, left, right and bottom of the rocker contact 721 according to the relative position that meets the convenience of operation.

[0037] On the panel of the control box 8, four key switches (not shown) can also be set. They can be four juxtaposed key switches or one key can be set in each of the up, down, left, and right directions on the surface of the control box 8, which is convenient for operation and memory. The first key switch is used to control the rise of the seat 2, the second key switch is used to control the descent of the seat 2, the third key switch is used to reduce the angle between the backrest 3 and the seat 2, and the fourth key switch is used to increase the angle between the backrest 3 and the seat 2. That is, the first key switch corresponds to the function of the first contact 722, the second key switch corresponds to the function of the second contact 723, the third key switch corresponds to the function of the third contact 724, and the fourth key switch corresponds to the function of the fourth contact 725. Setting key switches on the control box 8 can further increase the convenience of operation and the options for the operator.

[0038] As Figure 2 and Figure 4 shown, a brake assembly 10 is also provided in the second arm body 412 of the first instrument arm 42. The brake assembly 10 includes a control valve 103 and a brake cylinder assembly 104. The rocker contact 721 contacts the fifth contact to close the control valve 103, thereby controlling the retraction of the brake disc 1041 of the brake cylinder assembly 104 and releasing the brake on the instrument arm 4. The control valve 103 can be, for example, an electromagnetic valve or a pneumatic valve, preferably an electromagnetic valve, which can be controlled more precisely. By opening or cutting off the air source 101 of the brake cylinder assembly 104 through the electromagnetic valve, the brake cylinder is controlled to extend or retract the brake disc 1041. When the button 71 at the top of the rocker handle 72 is pressed downward, the rocker contact 721 contacts the fifth contact. Through the relay 102, the electromagnetic valve cuts off the air source 101 of the brake cylinder assembly 104, and the brake disc 1041 retracts, thereby releasing the brake on the instrument arm 4. When the button 71 at the top of the rocker handle 72 is released, the electromagnetic valve automatically resets, opens the air source 101 of the brake cylinder assembly 104, and the brake disc 1041 extends to brake the instrument arm 4. For example, the control switch 7 is electrically connected to the electromagnetic valve through the relay 102. If necessary, another set of brake assemblies 10 can also be provided in the second instrument arm 43 corresponding to the first instrument arm 42.

[0039] As Figure 2 and Figure 4As shown in the figure, specifically, a seat motor 12 can be provided on the seat 2 and the base 1, and a backrest motor 11 can be provided on the seat 2 and the backrest 3. Both the seat motor 12 and the backrest motor 11 can be electric push rods, and the control of the electric push rods is more sensitive and accurate. For example, the seat motor 12 can fix the main body on the seat 2 and fixedly connect the driving end of the push rod to the base 1. The backrest motor 11 can connect the main body to the seat 2 and connect the driving end of the push rod to the backrest 3. The rocker contact 721 contacts the first contact 722 to control the extension of the push rod of the seat motor 12, so that the seat 2 rises relative to the base 1; the rocker contact 721 contacts the second contact 723 to control the retraction of the push rod of the seat motor 12, so that the seat 2 descends relative to the base 1; the rocker contact 721 contacts the third contact 724 to control the retraction of the push rod of the backrest motor 11, so that the included angle between the backrest 3 and the seat 2 becomes smaller; the rocker contact 721 contacts the fourth contact 725 to control the extension of the push rod of the backrest motor 11, so that the included angle between the backrest 3 and the seat 2 becomes larger. When the rocker contact 721 contacts the first contact 722 and the second contact 723 respectively, the signals are respectively converted by the signal conversion board 13 and the motor drive board 14 and then the seat motor 12 is controlled; when the rocker contact 721 contacts the third contact 724 and the fourth contact 725 respectively, the signals are also respectively converted by the signal conversion board 13 and the motor drive board 14 and then the backrest motor 11 is controlled.

[0040] As Figure 1 shown, to further increase the convenience of operation, the control and adjustment structure of this embodiment can further include a foot switch 9 provided on the base 1. The foot switch 9 includes a foot contact, a sixth contact, a seventh contact, an eighth contact and a ninth contact. The foot contact contacts the sixth contact to control the extension of the push rod of the seat motor 12, so that the seat 2 rises relative to the base 1; the foot contact contacts the seventh contact to control the retraction of the push rod of the seat motor 12, so that the seat 2 descends relative to the base 1; the foot contact contacts the eighth contact to control the retraction of the push rod of the backrest motor 11, so that the included angle between the backrest 3 and the seat 2 becomes smaller; the foot contact contacts the ninth contact to control the extension of the push rod of the backrest motor 11, so that the included angle between the backrest 3 and the seat 2 becomes larger. Specifically, the sixth contact corresponds to the function of the first contact 722, the seventh contact corresponds to the function of the second contact 723, the eighth contact corresponds to the function of the third contact 724, and the ninth contact corresponds to the function of the fourth contact 725.

[0041] The headrest 5 is provided at the upper end of the backrest 3 for the user's head to lean on, improving the use comfort.

[0042] The control and adjustment structure and dental chair provided by the embodiments of the present application have the advantages of simple structure, convenient use, and high operation accuracy. By holding and operating the control switch with one hand, various operations such as the lifting of the seat, the pitching of the backrest, and the braking of the instrument arm can be realized. At the same time, to further improve the convenience of operation, a variety of operation methods are set, which can be operated by buttons or pedals, and the operation methods are flexible.

[0043] It should be noted that in this text, the term "including", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element.

[0044] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A control and adjustment structure for a dental chair, the dental chair comprising a base and a seat, a backrest and an instrument arm provided on the base; characterized in that, The control and adjustment structure includes a control switch, which includes a rocker handle, which can be arranged on the instrument arm in a relatively swingable manner, or a lever is provided on the rocker handle that can swing relative to the rocker handle; the rocker handle or the swing of the lever is used to control the rise or fall of the seat relative to the base, and to control the reduction or increase of the angle between the chair back and the seat.

2. The control and adjustment structure according to claim 1, characterized in that, The control switch also includes a rocker contact arranged in the rocker handle, and a first contact, a second contact, a third contact and a fourth contact arranged around the rocker contact, and the control switch is configured as follows: the rocker contact and the first contact are in contact with each other to raise the seat relative to the base; the rocker contact and the second contact are in contact with each other to lower the seat relative to the base; the rocker contact and the third contact are in contact with each other to move the upper end of the chair back toward the seat; and the rocker contact and the fourth contact are in contact with each other to move the upper end of the chair back toward the seat.

3. The control and adjustment structure according to claim 2, characterized in that The rocker contact is connected to the lower end of the rocker handle, the first contact point, the second contact point, the third contact point and the fourth contact point are respectively arranged at one of the front, rear, left and right sides of the rocker contact, and shaking the rocker handle is used to drive the rocker contact point to contact the first contact point, the second contact point, the third contact point or the fourth contact point respectively; Alternatively, the rocker contact is arranged at the upper end of the rocker handle, the rocker contact is connected to the shift rod, the upper end of the shift rod extends out of the rocker handle, the first contact, the second contact, the third contact and the fourth contact are respectively located in the rocker handle, and are respectively arranged at one of the front, rear, left and right sides relative to the rocker contact, and moving the shift rod is used to drive the rocker contact to contact the first contact, the second contact, the third contact or the fourth contact respectively.

4. The control and adjustment structure according to claim 2, characterized in that, It also includes a fifth contact, which is arranged below the rocker contact. A button is also arranged on the rocker handle. Pressing the button is used to make the rocker contact and the fifth contact contact so as to release the brake of the instrument arm.

5. The control and adjustment structure according to claim 4, characterized in that It also includes a brake assembly arranged in the instrument arm, and the brake assembly includes a control valve and a brake cylinder assembly; the rocker contact and the fifth contact point are used to close the control valve, thereby controlling the brake disc of the brake cylinder assembly to retract, so that the instrument arm is released from braking.

6. The control and adjustment structure according to claim 2, wherein It further includes a seat motor and a backrest motor; when the rocker contact touches the first contact, it is used to control the push rod of the seat motor to extend, so that the seat rises relative to the base; when the rocker contact touches the second contact, it is used to control the push rod of the seat motor to retract, so that the seat descends relative to the base; when the rocker contact touches the third contact, it is used to control the push rod of the backrest motor to retract, so that the angle between the backrest and the seat becomes smaller; when the rocker contact touches the fourth contact, it is used to control the push rod of the backrest motor to extend, so that the angle between the backrest and the seat becomes larger.

7. The control and adjustment structure according to claim 1, characterized in that, It further includes a control box which is arranged on the robotic arm, a control switch is arranged on the control box, and there are also 4 key switches on the control box. The first key switch is used to control the rise of the seat, the second key switch is used to control the descent of the seat, the third key switch is used to reduce the angle between the backrest and the seat, and the fourth key switch is used to increase the angle control between the backrest and the seat.

8. The control and adjustment structure according to claim 6, wherein It further includes a foot switch arranged on the base. The foot switch includes a foot contact, a sixth contact, a seventh contact, an eighth contact and a ninth contact; when the foot contact touches the sixth contact, it is used to control the push rod of the seat motor to extend, so that the seat rises relative to the base; when the foot contact touches the seventh contact, it is used to control the push rod of the seat motor to retract, so that the seat descends relative to the base; when the foot contact touches the eighth contact, it is used to control the push rod of the backrest motor to retract, so that the angle between the backrest and the seat becomes smaller; when the foot contact touches the ninth contact, it is used to control the push rod of the backrest motor to extend, so that the angle between the backrest and the seat becomes larger.

9. The control and adjustment structure according to claim 6, wherein, The seat motor and the backrest motor respectively include electric push rods.

10. A dental chair, characterized in that, It includes the control and adjustment structure according to any one of claims 1 to 9.

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