Electric control pedal and dental chair

Abstract

The utility model relates to the technical field of medical instruments, in particular to an electric control pedal and a dental chair. The circuit board is arranged on the mounting part, and a plurality of control contacts are formed on the circuit board; the switch assembly comprises a plurality of control switch pieces, and at least part of the main body of each control switch piece extends into the overlook projection range of the circuit board, so that different control switch pieces can be connected with different control contacts. The electric control pedal is provided with the circuit board, and all the control switch parts are integrated on the circuit board, so that the cost of the electric control pedal is reduced, the size of the electric control pedal is reduced, the installation process of the electric control pedal is simplified, and the assembly efficiency of the electric control pedal is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an electric-controlled foot pedal and a dental chair. Background Art

[0002] The dental comprehensive treatment machine plays an irreplaceable role in oral treatment. The dental comprehensive treatment machine includes a dental chair for accommodating patients and a treatment module for treatment. The treatment module includes a foot pedal, a tool tray, etc. The foot pedal is used to control the on-off of the water vapor path and adjust the height and backrest angle of the dental chair. Various switches are set in different foot pedals, such as switches for controlling the on-off of the total water path and the total gas path, so as to realize functions such as separate air jet or separate water spray. The foot pedal is divided into air control and electric control. The traditional air control foot pedal has relatively single functions, and the electric control foot pedal has relatively more functions. Due to the increase in the number of electric control functions, more switches are set. Often one switch corresponds to one circuit board, or several similar switches correspond to one circuit board. Therefore, they are all composed of multiple circuit boards, which leads to an increase in the size and cost of the foot pedal, and the ordering and installation are more complicated, thereby increasing the cost of the dental chair and affecting the aesthetics of the dental chair. In addition, the existing electric control foot pedal will directly act on the circuit board with all its strength when operating the switch, making the circuit board easily crushed. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide an electric foot pedal and a dental chair to solve the problem that the existing electric foot pedal used to control the dental chair has an increase in electric control functions and needs to set up multiple circuit boards according to different functions, resulting in an increase in the size and cost of the electric foot pedal, and more complicated ordering and installation.

[0004] A first aspect of the utility model provides an electric-controlled pedal, wherein the electric-controlled pedal comprises:

[0005] A base formed with a protruding mounting portion;

[0006] A circuit board is arranged on the mounting portion, and a plurality of control contacts are formed on the circuit board;

[0007] The switch assembly comprises a plurality of control switch elements, wherein at least a portion of the main body of each control switch element extends into the top view projection range of the circuit board, so that different control switch elements can be connected to different control contacts.

[0008] Preferably, the switch assembly comprises:

[0009] A first control switch is hinged to the base; the first control switch is formed with a first trigger portion and a first pedal portion, and the first trigger portion and the first pedal portion are respectively located on both sides of a hinge between the first control switch and the base; the first trigger portion is located below the circuit board, and when the first pedal portion is pressed down, it can drive the first trigger portion to move upward to abut against the control contact.

[0010] Preferably, the first pedal portion is located on the top of the first control switch;

[0011] A protruding first limiting portion is formed at the bottom of the first control switch; when the first treading portion is pressed downward, the first limiting portion can abut against the ground and / or the base to limit the displacement of the first triggering portion.

[0012] Preferably, the switch assembly comprises:

[0013] A second control switch is formed with a second trigger portion and a second tread portion, and when the second tread portion is not subjected to force, the second trigger portion abuts against the control contact;

[0014] A first elastic member, disposed on a side of the second trigger portion away from the circuit board and abutting against the second control switch;

[0015] When the second treading part is subjected to force, the second triggering part is separated from the control contact, and the second control switch squeezes the first elastic member; after the force on the second treading part is removed, the first elastic member rebounds to drive the second triggering part to abut against the control contact.

[0016] Preferably, the switch assembly comprises:

[0017] The third control switch is formed with a third trigger part and a third pedal part. When the third pedal part is pressed down, it can drive the third trigger part to abut against the control contact; the third pedal part is located directly above the base, so that the base can limit the displacement of the third pedal part when it is pressed down.

[0018] Preferably, the third treading portion can swing relative to the third triggering portion;

[0019] Two protruding second limiting parts are formed on the top of the base, and a limiting space for the third control switch to swing is formed between the two second limiting parts, and the third control switch can swing to abut against the side wall of the second limiting part;

[0020] The mounting portion is arranged on the top of the second limiting portion.

[0021] Preferably, the switch assembly comprises:

[0022] The fourth control switch is formed with a fourth trigger part, which is magnetic; part of the control contacts are formed as Hall sensors, and a plurality of Hall sensors are provided. The fourth trigger part can move in a direction close to a certain Hall sensor to trigger the Hall sensor.

[0023] Preferably, the switch assembly comprises:

[0024] A handle is hinged to the base, and the handle is formed with a fifth trigger portion and a reset portion; when the handle is not subjected to force, the fifth trigger portion abuts against the control contact;

[0025] A second elastic member is arranged on a side of the fifth trigger portion away from the circuit board and abuts against the reset portion; the handle under force rotates to drive the fifth trigger portion to separate from the control contact and drive the reset portion to squeeze the second elastic member; the rebound of the second elastic member can push the reset portion to move so as to drive the fifth trigger portion to abut against the control contact again.

[0026] Preferably, the electric-controlled pedal further comprises:

[0027] The shell is arranged above the base, the shell and the base enclose an accommodating space, the circuit board is arranged in the accommodating space, and the main body of the control switch part extends out of the shell.

[0028] A second aspect of the utility model provides a dental chair, comprising the electric-controlled foot pedal described in any of the above technical solutions.

[0029] Compared with the prior art, the beneficial effects of the utility model are:

[0030] The electric control pedal of the utility model is provided with a circuit board and all the control switch components are integrated into the circuit board, thereby reducing the cost of the electric control pedal, reducing the volume of the electric control pedal, simplifying the installation process of the electric control pedal, and improving the assembly efficiency of the electric control pedal; in addition, the circuit board is installed on the protruding installation part, so that a predetermined distance is formed between the circuit board and the base, which facilitates the connection of some control switch components with the control contacts on the circuit board, making the overall layout of the electric control pedal more reasonable and compact.

[0031] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of an electric-controlled pedal provided in an embodiment of the utility model;

[0034] Figure 2 A schematic diagram of the structure of the electric control pedal provided in an embodiment of the utility model with the housing and handle disassembled;

[0035] Figure 3 A schematic diagram of the structure of the electric control pedal provided in an embodiment of the utility model with the housing and circuit board disassembled;

[0036] Figure 4 A schematic cross-sectional view of the electric-controlled pedal provided in an embodiment of the utility model;

[0037] Figure 5 A schematic diagram of the top view of the electric control pedal provided in an embodiment of the utility model after the housing and the circuit board are disassembled;

[0038] Figure 6 A schematic diagram of the top view of the electric control pedal provided in an embodiment of the utility model after the housing and the circuit board are disassembled and the third control switch is toggled;

[0039] Figure 7 A schematic structural diagram of a circuit board in an electronically controlled pedal provided in an embodiment of the utility model.

[0040] Icon: 10-base; 11-installation part; 12-second limiting part; 20-circuit board; 21-control contact; 211-Hall sensor; 30-first control switch; 31-first trigger part; 32-first pedal part; 33-first limiting part; 40-second control switch; 41-second trigger part; 42-second pedal part; 50-third control switch; 51-third trigger part; 52-third pedal part; 60-fourth control switch; 61-fourth trigger part; 70-handle; 71-fifth trigger part; 72-reset part; 81-first elastic member; 82-second elastic member; 90-shell. DETAILED DESCRIPTION

[0041] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0042] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0043] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0044] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0045] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0046] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0047] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0048] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0049] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0050] According to a first aspect of the utility model, an electric-controlled foot pedal is provided, which includes a base 10, a circuit board 20 and a switch assembly.

[0051] Hereinafter, the specific structures of the above-mentioned components of the electric control foot pedal according to the present embodiment will be described.

[0052] In this embodiment, if Figures 1 to 7 As shown, the base 10 is formed as a plate-like structure and is arranged at the bottom of the electric control foot pedal. A protruding mounting portion 11 is formed on the top of the base 10. The mounting portion 11 can be a columnar structure. The circuit board 20 is arranged on the mounting portion 11, so that the circuit board 20 is fixed relative to the base 10.

[0053] In a preferred embodiment, the circuit board 20 is disposed on the top of the mounting portion 11, so that a predetermined distance is formed between the circuit board 20 and the base 10, which facilitates the connection or separation of the switch assembly described below with the circuit board 20. The circuit board 20 and the base 10 can be disposed in parallel.

[0054] In this embodiment, if Figures 1 to 7 As shown, there is one circuit board 20 , and a plurality of control contacts 21 are formed on the circuit board 20 , and different control contacts 21 correspond to controlling different functions; in this embodiment, control contacts 21 are provided on the surfaces of both the front and back sides of the circuit board 20 .

[0055] In this embodiment, as shown in Figures 1 to Figure 6 As shown, the switch assembly includes a plurality of control switch elements, each of which is used to control at least one control contact 21. At least part of the main body of each control switch element extends into the top projection range of the circuit board 20, so that different control switch elements can be connected to different control contacts 21; it should be noted that the connection mode between the control switch element and the control contact 21 can be a direct contact abutment connection or a magnetic induction non-contact connection.

[0056] In addition, in this embodiment, Figures 1 to 3 As shown, the electric-controlled foot pedal also includes a shell 90 arranged above the base 10. The shell 90 and the base 10 form an accommodating space. The circuit board 20 is arranged in the accommodating space to protect the circuit board 20. The main body of the control switch part extends out of the shell 90 for people to operate with their feet, so that the control switch part located inside the shell 90 is connected or separated from the circuit board 20.

[0057] Furthermore, in this embodiment, if Figures 2 to 6 As shown, the switch assembly includes a first control switch 30, that is, a part of the control switch member is formed as the first control switch 30. The number of the first control switches 30 can be one or more and they are arranged on the side of the electric-controlled foot pedal. For example, there are two first control switches 30 and they are respectively located on the two sides of the electric-controlled foot pedal opposite to each other.

[0058] The first control switch 30 is hinged to the base 10 so that the first control switch 30 can rotate at a preset angle relative to the base 10. Specifically, the first control switch 30 is formed with a first trigger portion 31 and a first pedal portion 32. The first trigger portion 31 can be formed as a rod-shaped structure. The first trigger portion 31 and the first pedal portion 32 are respectively located on both sides of the hinge between the first control switch 30 and the base 10, so that when the first pedal portion 32 moves downward, the first trigger portion 31 can be tilted upward; more specifically, the first trigger portion 31 is located below the circuit board 20. When a person steps on the first control switch 30, the first pedal portion 32 is pressed downward and can drive the first trigger portion 31 to move upward, so that the first trigger portion 31 abuts against the control contact 21 on the circuit board 20, thereby enabling the corresponding function.

[0059] In this embodiment, if Figure 2 and Figure 3 As shown, the first tread portion 32 is located at the top of the first control switch 30 and outside the housing 90, so that the foot of the person can contact the first tread portion 32 and apply force to it so that the first tread portion 32 is pressed down. Furthermore, a protruding first limit portion 33 is formed at the bottom of the first control switch 30, and the first limit portion 33 can be a convex block structure; when the first tread portion 32 is pressed down, the first limit portion 33 can abut against the ground and / or the base 10 to limit the displacement of the first trigger portion 31, thereby limiting the upward displacement of the first trigger portion 31, thereby preventing the force applied by the foot from being transmitted to the circuit board 20 through the first trigger portion 31 to cause the circuit board 20 to be crushed, thereby protecting the circuit board 20.

[0060] In this embodiment, if Figures 2 to 4 As shown, the switch assembly includes a second control switch 40 and a first elastic member 81, that is, part of the control switch member is formed into the second control switch 40, the number of the second control switches 40 can be one or more, the second control switch 40 is formed with a second trigger portion 41 and a second pedal portion 42, the second pedal portion 42 is located at the top of the second control switch 40 and extends out of the shell 90, the second trigger portion 41 is located at the bottom of the second control switch 40, the second trigger portion 41 can be formed into a rod-shaped structure and extends under the circuit board 20, when the second pedal portion 42 is not subjected to force, the second trigger portion 41 abuts against the control contact 21, that is, in a natural state, the second trigger portion 41 and the control contact 21 remain connected.

[0061] In this embodiment, if Figure 4As shown, the first elastic member 81 can be a spring. The first elastic member 81 is arranged on the side of the second trigger part 41 away from the circuit board 20 and abuts against the second control switch 40. The first elastic member 81 can be clamped between the base 10 and the second control switch 40; when a person steps on the second control switch 40 so that the second treading part 42 is subjected to force, the second control switch 40 moves downward so that the second trigger part 41 is separated from the control contact 21, and the second control switch 40 squeezes the first elastic member 81; when the person moves his foot away so that the force on the second treading part 42 is cancelled, the first elastic member 81 rebounds so that the second control switch 40 moves upward to drive the second trigger part 41 to abut against the control contact 21.

[0062] In this embodiment, if Figures 2 to 6 As shown, the switch assembly includes a third control switch 50, that is, part of the control switch member is formed as the third control switch 50, and the third control switch 50 is formed with a third trigger part 51 and a third pedal part 52. The main body of the third control switch 50 can be formed as a rod-shaped structure, and the third trigger part 51 and the third pedal part 52 are located at the two ends in the length direction of the third control switch 50, and the third trigger part 51 is located inside the shell 90, and the third pedal part 52 is located outside the shell 90. When the third pedal part 52 is pressed down, it can drive the third trigger part 51 to abut against the control contact 21 to enable the corresponding function.

[0063] In a preferred embodiment, the third pedal portion 52 is located directly above the base 10, so that the base 10 can limit the displacement of the third pedal portion 52 when it is pressed down. In this way, when the third control switch 50 is stepped on, the stroke is small, so that it is immediately blocked by the base 10 after just triggering the control contact 21. In this way, the force applied by the person on the third pedal portion 52 is prevented from acting entirely on the circuit board 20, thereby protecting the circuit board 20.

[0064] Furthermore, in this embodiment, if Figure 5 and Figure 6 As shown, the third pedal portion 52 can swing relative to the third trigger portion 51, that is, a person can reciprocate the third control switch 50 to achieve an adjustment effect; two protruding second limit portions 12 are formed on the top of the base 10, and the second limit portions 12 can be formed into a block structure. A limit space for the third control switch 50 to swing is formed between the two second limit portions 12, and the third control switch 50 can swing to abut against the side wall of the second limit portion 12, thereby preventing the third control switch 50 from continuing to rotate, thereby limiting the displacement of the third control switch 50 to achieve precise adjustment.

[0065] In a preferred embodiment, Figure 5 and Figure 6As shown, one side of the two second limiting parts 12 facing each other is formed into an inclined surface, thereby increasing the contact area when the third control switch 50 abuts against the inclined surface on any second limiting part 12 to achieve effective limiting.

[0066] Furthermore, if Figures 4 to 6 As shown, the mounting portion 11 is disposed on the top of the second limiting portion 12, so as to prevent the third control switch 50 from directly acting on the mounting portion 11 during reciprocating swinging and causing the mounting portion 11 to be damaged, thereby ensuring that the circuit board 20 is installed stably and reliably.

[0067] It should be noted that a reset structure may also be provided for the pressed third control switch 50 , for example, a spring may be provided at one end away from the third pedal portion 52 , so that the third pedal portion 52 can move upward to a normal initial position after the force on the third pedal portion 52 is removed.

[0068] In this embodiment, if Figures 1 to 3 and Figure 7 As shown, the switch assembly includes a fourth control switch 60, which is mounted on the top of the housing 90 and is formed with a fourth trigger portion 61 extending into the interior of the housing 90. The fourth trigger portion 61 is magnetic, and part of the control contact 21 is formed as a Hall sensor 211, so that the fourth trigger portion 61 forms a magnetic induction connection with the Hall sensor 211. Specifically, a plurality of Hall sensors 211 are provided, and the fourth trigger portion 61 can move in a direction close to a certain Hall sensor 211 to trigger the Hall sensor 211, thereby enabling the corresponding function. For example, four Hall sensors 211 are provided and the four Hall sensors 211 are arranged in a cross structure. In the natural state, the fourth trigger portion 61 is located in the middle of the cross structure. When the fourth trigger portion 61 moves in a direction close to any Hall sensor 211, the distance between it and other Hall sensors 211 increases, thereby ensuring accurate sensing.

[0069] It should be noted that the fourth trigger part 61 preferably translates on a horizontal plane parallel to the circuit board 20 to ensure that the distance between the fourth trigger part 61 and each Hall sensor 211 in a vertical direction perpendicular to the horizontal plane remains unchanged, thereby further improving the accuracy of sensing.

[0070] In this embodiment, if Figures 1 to 3As shown, the switch assembly includes a handle 70 and a second elastic member 82, the handle 70 is formed into a bent rod-shaped structure, both ends of the handle 70 are hinged to the base 10 respectively, the handle 70 is formed with a fifth trigger portion 71 and a reset portion 72, and one or more trigger portions and reset portions 72 can be provided, the fifth trigger portion 71 and the reset portion 72 are both provided in the shell 90 and are both formed into a rod-shaped structure; when the handle 70 is not subjected to force, the fifth trigger portion 71 abuts against the control contact 21, that is, in a natural state, the fifth trigger portion 71 is in a state of continuous contact with the control contact 21.

[0071] The second elastic member 82 can be a spring. The second elastic member 82 is arranged on the side of the fifth trigger part 71 away from the circuit board 20, and the second elastic member 82 abuts against the reset part 72. The second elastic member 82 can be arranged between the base 10 and the reset part 72; when the handle 70 is subjected to a force from the dental chair body or a person, the handle 70 will rotate in the direction close to the shell 90. The rotation of the handle 70 under force can drive the fifth trigger part 71 and the reset part 72 to rotate downward synchronously, so that the fifth trigger part 71 is separated from the control contact 21, and drives the reset part 72 to squeeze the second elastic member 82; when the force applied to the handle 70 is eliminated, the second elastic member 82 rebounds to push the reset part 72 to move, thereby driving the handle 70 to rotate in the direction away from the shell 90, so as to drive the fifth trigger part 71 to abut against the control contact 21 again.

[0072] It should be noted that in this embodiment, the second control switch 40 and the handle 70 are driven by the first elastic member 81 and the second elastic member 82 respectively when resetting, rather than being driven manually. Therefore, the force applied by the second trigger part 41 and the fifth trigger part 71 to the circuit board 20 is relatively small and will not damage the circuit board 20.

[0073] According to the utility model, the electric control pedal is provided with a circuit board and all the control switch components are integrated into the circuit board. While meeting different functional requirements, it also has the advantages of reducing the cost of the electric control pedal, reducing the volume of the electric control pedal, simplifying the installation process of the electric control pedal, and improving the assembly efficiency of the electric control pedal. The circuit board is installed on the protruding installation part, so that a predetermined distance is formed between the circuit board and the base, which is convenient for some control switch components to be connected with the control contacts on the circuit board, making the overall layout of the electric control pedal more reasonable and compact. In addition, the control switch components that are in direct contact with the control contacts are provided with a protective structure, such as a first limit part on the first control switch, so as to avoid direct full force acting on the circuit board when operating the switch, causing the circuit board to be easily crushed, thereby effectively protecting the circuit board and extending the service life of the electric control pedal.

[0074] A dental chair provided by the utility model comprises the above-mentioned electric-controlled foot pedal, and thus has all the beneficial effects of the electric-controlled foot pedal, which will not be described in detail herein.

[0075] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electric controlled pedal, characterized in that: The electronically controlled pedal comprises: A base formed with a protruding mounting portion; A circuit board is arranged on the mounting portion, and a plurality of control contacts are formed on the circuit board; The switch assembly comprises a plurality of control switch elements, wherein at least a portion of the main body of each control switch element extends into the top view projection range of the circuit board, so that different control switch elements can be connected to different control contacts.

2. The electronically controlled pedal according to claim 1, characterized in that: The switch assembly comprises: A first control switch is hinged to the base; the first control switch is formed with a first trigger portion and a first pedal portion, and the first trigger portion and the first pedal portion are respectively located on both sides of a hinge between the first control switch and the base; the first trigger portion is located below the circuit board, and when the first pedal portion is pressed down, it can drive the first trigger portion to move upward to abut against the control contact.

3. The electric control pedal according to claim 2, characterized in that: The first pedal portion is located on the top of the first control switch; A protruding first limiting portion is formed at the bottom of the first control switch; when the first treading portion is pressed downward, the first limiting portion can abut against the ground and / or the base to limit the displacement of the first triggering portion.

4. The electronically controlled pedal according to claim 1, characterized in that: The switch assembly comprises: A second control switch is formed with a second trigger portion and a second tread portion, and when the second tread portion is not subjected to force, the second trigger portion abuts against the control contact; A first elastic member, disposed on a side of the second trigger portion away from the circuit board and abutting against the second control switch; When the second treading part is subjected to force, the second triggering part is separated from the control contact, and the second control switch squeezes the first elastic member; after the force on the second treading part is removed, the first elastic member rebounds to drive the second triggering part to abut against the control contact.

5. The electronically controlled pedal according to claim 1, characterized in that: The switch assembly comprises: The third control switch is formed with a third trigger part and a third pedal part. When the third pedal part is pressed down, it can drive the third trigger part to abut against the control contact; the third pedal part is located directly above the base, so that the base can limit the displacement of the third pedal part when it is pressed down.

6. The electronically controlled pedal according to claim 5, characterized in that: The third treading portion is capable of swinging relative to the third triggering portion; Two protruding second limiting parts are formed on the top of the base, and a limiting space for the third control switch to swing is formed between the two second limiting parts, and the third control switch can swing to abut against the side wall of the second limiting part; The mounting portion is arranged on the top of the second limiting portion.

7. The electronically controlled pedal according to claim 1, characterized in that: The switch assembly comprises: The fourth control switch is formed with a fourth trigger part, which is magnetic; part of the control contacts are formed as Hall sensors, and a plurality of Hall sensors are provided. The fourth trigger part can move in a direction close to a certain Hall sensor to trigger the Hall sensor.

8. The electronically controlled pedal according to claim 1, characterized in that: The switch assembly comprises: A handle is hinged to the base, and the handle is formed with a fifth trigger portion and a reset portion; when the handle is not subjected to force, the fifth trigger portion abuts against the control contact; A second elastic member is arranged on a side of the fifth trigger portion away from the circuit board and abuts against the reset portion; the handle under force rotates to drive the fifth trigger portion to separate from the control contact and drive the reset portion to squeeze the second elastic member; the rebound of the second elastic member can push the reset portion to move so as to drive the fifth trigger portion to abut against the control contact again.

9. The electronically controlled pedal according to claim 1, characterized in that: The electronically controlled pedal further comprises: The shell is arranged above the base, the shell and the base enclose an accommodating space, the circuit board is arranged in the accommodating space, and the main body of the control switch part extends out of the shell.

10. A dental chair, characterized in that: The invention comprises the electronically controlled pedal according to any one of claims 1 to 9.

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