Dental chair and dental chair control method

Abstract

The invention relates to the technical field of medical instruments, in particular to a dental chair and a dental chair control method.The dental chair comprises a fixing frame, a cushion frame and a leg bracket, and the cushion frame is rotationally connected with the fixing frame and the leg bracket; a first output end for driving the leg bracket to rotate relative to the cushion frame is formed on the rotating part; the driving part stretches out and draws back to drive the rotating part to rotate, the rotating center line of the rotating part penetrates through the point E, the first connecting rod unit and the first output end are rotationally connected to the point F, and the first connecting rod unit and the leg bracket are rotationally connected to the point G; when the rotating part rotates to enable the leg bracket to convert the dental chair from a folded state to an unfolded state, the first output end pushes the first connecting rod unit, the F point moves from top to bottom, and the distance between the F point and a connecting line EG formed by connecting the E point and the G point is reduced and then increased, so that the rotating angle of the leg bracket relative to the cushion frame is increased and then reduced; after the dental chair is completely unfolded, the legs of a patient can slightly bend instead of being completely straightened and cannot incline upwards, and the comfort level is improved.

Description

Technical Field

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

[0002] A dental chair, namely a comprehensive dental treatment chair, is used for treating dental diseases. When a common dental chair is in use, it is necessary to control the angles between the backrest, the seat cushion and the leg rest so as to adapt to different treatment workstations. For example, Chinese Patent CN202311819573.2 discloses a three-fold chair. When the dental chair is in the unfolded state for the patient to lie flat, the seat cushion is in an inclined state, resulting in the leg rest being in an inclined state that raises the patient's legs upward, which affects the comfort of the patient. In addition, the existing leg rests of dental chairs all adopt the method of direct drive by a single motor to achieve rotation. Although the problem of adjusting the degree of freedom of the leg rest is solved, the additional motor not only increases the cost but also requires a larger installation space on the dental chair to accommodate the motor for driving the folding or unfolding of the dental chair, resulting in a large volume of the dental chair and inconvenient layout. Summary of the Invention

[0003] In view of this, the purpose of the present application is to provide a dental chair and a control method thereof to solve the problem that when the existing dental chair is in the unfolded state, the seat cushion is in an inclined state, resulting in the leg rest raising the patient's legs to an upward inclined state, which affects the comfort of the patient.

[0004] The first aspect of the present invention provides a dental chair, wherein the dental chair includes: A chair frame assembly, including a fixed frame, a seat cushion frame and a leg rest frame, the seat cushion frame is rotatably connected to the fixed frame, and the leg rest frame is rotatably connected to the seat cushion frame; A driving assembly, including a driving member installed on the seat cushion frame and a linkage assembly installed on the fixed frame, the linkage assembly includes a rotating member and a first link unit, and a first output end for driving the leg rest frame to rotate relative to the seat cushion frame is formed on the rotating member, and the first link unit is respectively rotatably connected to the first output end and the leg rest frame; When the driving member expands and contracts, it can drive the rotating member to rotate. The rotation center line of the rotating member passes through point E. The first link unit is rotatably connected to the first output end at point F, and the first link unit is rotatably connected to the leg rest frame at point G. When the rotating member rotates to convert the dental chair from the folded state to the unfolded state, the first output end pushes the first link unit, and the distance between point F and the line EG formed by connecting point E and point G first decreases and then increases, so that the rotation angle of the leg rest frame relative to the seat cushion frame first increases and then decreases. Preferably, when the F point moves downward and its distance from the connecting line EG gradually decreases, the distance between the E point and the G point gradually increases, so that the angle between the leg bracket and the seat cushion bracket increases. Until the F point moves downward to be collinear with the connecting line EG, the leg bracket is deployed to the maximum angle of rotation relative to the seat cushion bracket; the first output end continues to push the first link unit to drive the F point to continue to move downward, so that the distance between the F point and the connecting line EG gradually increases. At this time, the distance between the E point and the G point gradually decreases, realizing the reduction of the rotation angle of the leg bracket relative to the seat cushion bracket.

[0005] Preferably, after the rotation angle of the leg bracket relative to the seat cushion bracket decreases, the end of the leg bracket away from the seat cushion bracket is not higher than the end of the leg bracket rotatably connected to the seat cushion bracket.

[0006] Preferably, the linkage assembly further includes a second link unit. A second output end for driving the seat cushion bracket to rotate relative to the fixed bracket is formed on the rotating member. The second link unit is respectively rotatably connected to the second output end and the seat cushion bracket; When the leg bracket rotates relative to the seat cushion bracket, the seat cushion bracket rotates relative to the fixed bracket.

[0007] Preferably, the chair frame assembly further includes a backrest frame rotatably connected to the seat cushion bracket. The backrest frame is arranged at the end of the seat cushion bracket away from the leg bracket; The linkage assembly further includes a third link unit. A third output end for driving the backrest frame to rotate relative to the seat cushion bracket is formed on the rotating member. The third link unit is respectively rotatably connected to the third output end and the backrest frame; when the backrest frame rotates downward, the leg bracket is deployed accordingly.

[0008] Preferably, the rotating member includes a rod portion, an input portion and an output portion. The input portion and the output portion are both fixedly connected to the rod portion. The driving member is rotatably connected to the end of the input portion away from the rod portion. The first output end is arranged on the output portion and is spaced from the rotation center of the rotating member.

[0009] Preferably, the outer surface of the seat cushion bracket is covered with a seat cushion layer, and the outer surface of the backrest frame is covered with a backrest layer. A headrest is arranged at the end of the backrest frame away from the seat cushion bracket; The dental chair further includes: An airbag system, including a first inflatable member arranged on the seat cushion layer and a second inflatable member arranged on the backrest layer. The first inflatable member is arranged on the side of the seat cushion layer close to the backrest frame; the second inflatable member is arranged on the side of the backrest layer close to the headrest. Preferably, the first inflatable member extends along the width direction of the dental chair to both sides of the seat cushion layer in the width direction of the dental chair, and the second inflatable member extends along the width direction of the dental chair to both sides of the backrest layer in the width direction of the dental chair.

[0010] Preferably, an inflation cavity is formed inside both the first inflatable member and the second inflatable member; the airbag system further includes a control valve communicated with the inflation cavity. The second aspect of the present invention provides a dental chair control method, which is applied to the dental chair implemented by the above technical solution; the airbag system has a linkage control mode and an independent control mode; In the linkage control mode, the control valve is communicatively connected to the driving member, so that the airbag system can identify the movement position of the driving member. When the driving member is driven to 1 / 2 of the total stroke, the control valve opens and inflates the first inflatable member and the second inflatable member. When the driving member stops driving and the driving member moves to 1 / 5 of the total stroke at this time, both the first inflatable member and the second inflatable member are inflated to the preset maximum inflation amount. At this time, the control valve closes the inflation mode, and during the subsequent contraction of the driving member, the control valve continues to remain closed. When the driving member stops driving and the driving member moves to a position between 1 / 5 and 1 / 2 of the total stroke at this time, if the driving member is in a contracted state, the control valve opens the inflation mode; if the driving member is in an expanded state, the control valve opens the deflation mode. When the driving member moves to a position outside the range of 1 / 5 to 1 / 2 of the total stroke, the control valve closes, and at this time, neither inflation nor deflation occurs. In the linkage control mode, the control valve is not connected to the driving member.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: In the dental chair of the present invention, the chair frame assembly includes a fixed frame, a seat cushion frame, and a leg support bracket. The seat cushion frame is rotatably connected to the fixed frame, and the leg support bracket is rotatably connected to the seat cushion frame. The drive assembly includes a drive member mounted on the seat cushion frame and a linkage assembly mounted on the fixed frame. The linkage assembly includes a rotating member and a first link unit. A first output end for driving the leg support bracket to rotate relative to the seat cushion frame is formed on the rotating member. The first link unit is respectively rotatably connected to the first output end and the leg support bracket. When the drive member expands and contracts, it can drive the rotating member to rotate. The rotation center line of the rotating member passes through point E. The first link unit is rotatably connected to the first output end at point F, and the first link unit is rotatably connected to the leg support bracket at point G. When the rotating member rotates to cause the leg support bracket to transform the dental chair from the folded state to the unfolded state, the first output end pushes the first link unit, and the distance between point F and the connection line EG formed by points E and G first decreases and then increases as point F moves downward from top to bottom. This causes the rotation angle of the leg support bracket relative to the seat cushion frame to first increase and then decrease, realizing the leg support bracket to first unfold and then retract. In this way, after the dental chair is fully unfolded, the patient's legs can be slightly bent instead of being fully straightened, and the whole leg will not be in a state of tilting upward, thus improving the comfort of the patient during the treatment process.

[0012] In addition, for the dental chair control method of the present invention, the doctor can select the airbag system to be in the linkage control mode and the independent control mode according to actual needs, further improving the comfort of the patient during the treatment process.

[0013] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 A schematic structural diagram of the dental chair provided by the embodiment of the present invention in the folded state; Figure 2 A structural cross-sectional view of the dental chair provided by the embodiment of the present invention in the folded state; Figure 3 A schematic structural diagram of the dental chair provided by the embodiment of the present invention in the unfolded state when the leg support bracket is unfolded to the maximum angle; Figure 4 A schematic structural diagram of the dental chair provided by the embodiment of the present invention in the unfolded state when the leg support bracket rotates downward to achieve retraction; Figure 5 Side view structural schematic diagram of the dental chair provided by the embodiment of the present invention when the leg bracket rotates downward to achieve retraction in the deployed state; Figure 6 Top view structural schematic diagram of the dental chair provided by the embodiment of the present invention when the leg bracket rotates downward to achieve retraction in the deployed state; Figure 7 Structural schematic diagram of the dental chair provided by the embodiment of the present invention when the leg bracket rotates downward to achieve retraction from another perspective in the deployed state; Figure 8 Structural schematic diagram of the airbag system in the dental chair provided by the embodiment of the present invention.

[0016] Reference numerals: 10 - fixing bracket; 11 - mounting portion; 20 - seat cushion bracket; 30 - leg bracket; 40 - backrest bracket; 50 - driving member; 60 - linkage assembly; 61 - rotating member; 62 - rod portion; 63 - input portion; 64 - output portion; 601 - first link unit; 602 - second link unit; 603 - third link unit; 611 - first output end; 612 - second output end; 613 - third output end; 71 - seat cushion layer; 72 - backrest layer; 73 - headrest; 81 - first inflatable member; 82 - second inflatable member. Detailed implementation manners

[0017] The following detailed implementation manners are provided to assist the reader in obtaining 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 illustrative and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0018] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are 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.

[0019] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it can be directly "on" the other element, "connected to" the other element, "coupled to" the other element, "above" the other element, or "covering" the other element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly coupled to" another element, "directly above" another element, or "directly covering" another element, there can be no other elements intervening therebetween.

[0020] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0021] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, the first component, element, region, layer, or part described in the examples herein may also be referred to as the second component, element, region, layer, or part without departing from the teachings of the examples.

[0022] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" 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 relationship terms used herein will be interpreted accordingly.

[0023] The terms used herein are for the purpose of describing particular examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises," "comprising," and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0024] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the figures may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the figures, but include changes in shape that occur during manufacturing.

[0025] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of this application. Additionally, although the examples described herein have various configurations, other configurations are possible, as will be apparent after understanding the disclosure of this application.

[0026] A dental chair according to a first aspect of the present invention includes a chair frame assembly and a drive assembly.

[0027] Hereinafter, the specific structures of the above components of the dental chair according to the present embodiment will be described.

[0028] In the present embodiment, as Figures 1 to 7 shown, the chair frame assembly includes a fixed frame 10, a seat cushion frame 20, and a leg support 30. The fixed frame 10 is fixed in position relative to the dental chair base. The seat cushion frame 20 is disposed above the fixed frame 10 and is mainly used to support the patient's buttocks. The seat cushion frame 20 is rotatably connected to the fixed frame 10, so as to adjust the position and angle of the patient's buttocks during the switching process of folding and unfolding the dental chair. The leg support 30 is mainly used to support the patient's calves and feet. The leg support 30 is rotatably connected to the seat cushion frame 20, and the relative position relationship between the patient's buttocks and calves is adjusted by adjusting the angle between the leg support 30 and the seat cushion frame 20.

[0029] As Figures 1 to 7As shown in the figure, the driving assembly includes a driving member 50 mounted on the seat cushion frame 20 and a linkage assembly 60 mounted on the fixed frame 10. The driving member can be an electric push rod or a pneumatic push rod, etc., which is a linear motion mechanism capable of realizing telescopic movement. The driving member 50 is rotatably connected to the seat cushion frame 20, and one end of the driving member 50 that realizes telescopic movement is connected to the linkage assembly 60, so as to drive the linkage assembly 60 to rotate. Preferably, the seat cushion frame 20 is formed into a hollow frame structure, and the driving member 50 is installed inside the seat cushion frame 20, so as to reduce the volume of the dental chair; the linkage assembly 60 is installed on the fixed frame 10. Specifically, the fixed frame 10 is provided with a mounting portion 11, and the mounting portion 11 is a plate-like structure and is arranged on the side of the fixed member facing the seat cushion frame 20. Both the seat cushion frame 20 and the linkage assembly 60 are rotatably connected to the mounting portion 11. Preferably, there are two mounting portions 11, and the two mounting portions 11 are arranged opposite to each other in the width direction of the dental chair, so as to improve the installation reliability and stability of the linkage assembly 60 and the seat cushion frame 20.

[0030] In this embodiment, as Figures 1 to 7 shown, the linkage assembly 60 includes a rotating member 61 and a first link unit 601. A first output end 611 for driving the leg bracket 30 to rotate relative to the seat cushion frame 20 is formed on the rotating member 61. The first link unit 601 is rotatably connected to the first output end 611 and the leg bracket 30 respectively, so as to realize that the driving force of the driving member 50 is transmitted to the first link unit 601 through the first output end 611 of the rotating member 61 and drive the leg bracket 30 to rotate relative to the seat cushion frame 20. In the radial direction of the rotating member 61 (that is, in the direction perpendicular to the rotation center line of the rotating member 61), the first output end 611 and the second output end 612 and the third output end 613 described below are all arranged at intervals from the rotation center line of the rotating member 61, so that when the rotating member 61 rotates, the first output end 611, the second output end 612 and the third output end 613 can move around the rotation center line of the rotating member 61.

[0031] In this embodiment, as Figure 1 、 Figure 3 and Figure 5 shown, the telescopic movement of the driving member 50 can drive the rotating member 61 to rotate. The rotation center line of the rotating member 61 passes through point E. The first link unit 601 is rotatably connected to the first output end 611 at point F (it can be understood here that the first link unit 601 is hinged to the first output end 611 at point F), and the first link unit 601 is rotatably connected to the leg bracket 30 at point G (it can be understood here that the first link unit 601 is hinged to the leg bracket 30 at point G); when the rotating member 61 rotates and the leg bracket 30 converts the dental chair from the folded state to the unfolded state, the backrest frame 40 described below gradually rotates downward, and the dental chair is in Figure 1When in the folded state from a certain perspective, EFG forms a triangle, and the F point is above the connecting line EG formed by connecting the E point and the G point. The first output end 611 pushes the first link unit 601, and the F point moves downward from top to bottom, and the distance between the F point and the connecting line EG first decreases and then increases, so that the rotation angle of the leg bracket 30 relative to the seat bracket 20 first increases and then decreases, realizing the first unfolding and then retraction of the leg bracket 30. During the unfolding process of the leg bracket 30, the patient lies down gradually. After the dental chair is fully unfolded, the patient's legs can be slightly bent, rather than fully straightened, nor will the whole leg show a state of upward inclination, thereby improving the comfort of the patient during the treatment process. It should be noted that the E point, the F point, and the G point are located on the same plane. Specifically, this plane is perpendicular to the rotation center line of the rotating member 61. For example, this plane is parallel to the output part 64 of the plate-like structure described below, or this plane is coplanar with the plane where the output part 64 of the plate-like structure is located.

[0032] Specifically, in this embodiment, when the leg bracket 30 is in the Figures 1 to 3 unfolding process from a certain posture, the F point moves downward, and the distance between it and the connecting line EG gradually decreases. During this process, the distance between the E point and the G point gradually increases, realizing the continuous outward unfolding of the leg bracket 30 and the increase in the angle between the leg bracket 30 and the seat bracket 20 until the F point moves downward to be collinear with the connecting line EG (that is, the state of the leg support part shown in Figure 3 ), the leg bracket 30 is unfolded to the maximum rotation angle relative to the seat bracket 20, thus realizing the first unfolding of the leg bracket 30 as described above; the first output end 611 continues to push the first link unit 601 to drive the F point to continue to move downward (that is, the F point is no longer collinear with the connecting line EG but moves below the connecting line EG), so that the distance between the connecting line of the F point and the connecting line EG gradually increases (that is, see the state of the leg bracket 30 shown in Figure 5 ), at this time, the distance between the E point and the G point gradually decreases, realizing the decrease in the rotation angle of the leg bracket 30 relative to the seat bracket 20, thereby realizing the retraction of the leg bracket 30 after unfolding as described above.

[0033] In this embodiment, as shown in Figure 1 , Figure 3 and Figure 5 , after the rotation angle of the leg bracket 30 relative to the seat bracket 20 decreases, that is, after the relative rotation of the leg bracket 30 and the seat bracket 20 to the retraction of the leg bracket 30, the end of the leg bracket 30 far from the seat bracket 20 is not higher than the end where the leg bracket 30 is rotationally connected to the seat bracket 20. In this way, it is ensured that after the dental chair is fully unfolded, the patient's legs are slightly bent, and the lower legs are in a downward inclined posture, ensuring the comfort of the patient during the treatment process. It should be noted that if the angle between the leg bracket 30 and the seat cushion bracket 20 continuously increases during the unfolding of the dental chair, the end of the leg bracket 30 away from the seat cushion bracket 20 will continuously rise, and the patient's legs are prone to discomfort during treatment. In this application, the comfort of the patient is improved by the retraction of the leg support after unfolding.

[0034] Furthermore, in this embodiment, as Figures 1 to 7 shown, the linkage assembly 60 further includes a second link unit 602. A second output end 612 for driving the seat cushion bracket 20 to rotate relative to the fixed bracket 10 is formed on the rotating member 61. The second link unit 602 is respectively rotatably connected to the second output end 612 and the seat cushion bracket 20. In this way, when the driving member 50 drives the rotating member 61 to rotate, the second output end 612 can push the seat cushion bracket 20 to rotate relative to the fixed bracket 10, so as to realize the linkage rotation of the seat cushion bracket 20 relative to the fixed bracket 10 when the leg bracket 30 rotates relative to the seat cushion bracket 20.

[0035] In this embodiment, as Figures 1 to 7 shown, the chair frame assembly further includes a backrest frame 40 rotatably connected to the seat cushion bracket 20. The backrest frame 40 is arranged at the end of the seat cushion bracket 20 away from the leg bracket 30, mainly for supporting the patient's back. The linkage assembly 60 further includes a third link unit 603. A third output end 613 for driving the backrest frame 40 to rotate relative to the seat cushion bracket 20 is formed on the rotating member 61. The third link unit 603 is respectively rotatably connected to the third output end 613 and the backrest frame 40. In this way, when the driving member 50 drives the rotating member 61 to rotate, the third output end 613 can drive the backrest frame 40 to rotate relative to the seat cushion bracket 20, so as to realize the linkage that when the backrest frame 40 rotates downward, the leg bracket 30 unfolds accordingly. In this way, only by driving with one driving member 50, the backrest frame 40, the seat cushion bracket 20 and the leg bracket 30 can form a linkage relationship. In the prior art, only the independent rotation of the backrest frame 40 relative to the seat cushion bracket 20 can be controlled on the dental chair, which results in a fixed angle of the seat cushion bracket 20 in the prior art and thus cannot better adapt to the angle of the backrest frame 40. In this application, when the backrest frame 40 rotates, the seat cushion bracket 20 can adaptively rotate within a small range, and at the same time the leg bracket 30 also unfolds accordingly, further improving the comfort of the patient and simplifying the structure of the dental chair and reducing the volume of the dental chair.

[0036] In this embodiment, the structure of the first link unit 601, the second link unit 602 or the third link unit 603 can be a single rod, or a combination formed by a plurality of rotatably connected rods, or a plate-like structure or a combination of a plate-like structure and a rod-like structure rotatably connected. As long as the power can be transmitted to the leg bracket 30, the seat cushion bracket 20 or the backrest frame 40 when the rotating member 61 rotates, and the unfolding or folding of the dental chair can be realized.

[0037] Furthermore, in this embodiment, as Figures 1 to 7 shown, the rotating member 61 includes a rod portion 62, an input portion 63, and an output portion 64. The rod portion 62 is formed as a rod-shaped structure extending in the horizontal direction, such as a cylindrical rod-shaped structure. The input portion 63 is formed as a rod-shaped structure extending outward from the side wall of the rod portion 62 perpendicular to the rotation center line of the rod portion 62. The output portion 64 can be formed as a plate-shaped structure. The input portion 63 and the output portion 64 are both fixedly connected to the rod portion 62, so that the input portion 63, the rod portion 62, and the output portion 64 rotate synchronously under the drive of the driving member 50.

[0038] Specifically, one end of the driving member 50 that can be telescoped is rotatably connected to the end of the input portion 63 away from the rod portion 62. The first output end 611, the second output end 612, and the third output end 613 are all provided on the output portion 64 and are respectively spaced from the rotation center of the rotating member 61. The first output end 611, the second output end 612, and the third output end 613 can be formed as hinge holes opened on the output portion 64. The first output end 611, the second output end 612, and the third output end 613 are sequentially connected to form a triangular structure.

[0039] Preferably, in this embodiment, as Figures 1 to 7 shown, the rod portion 62 and the input portion 63 are provided with one and are installed inside the seat cushion frame 20. The output ends are provided in pairs at both ends in the length direction of the rod portion 62 and are provided on the sides outside the seat cushion frame 20. The first output end 611, the second output end 612, and the third output end 613 are all provided on each output portion 64. Two of the first link unit 601, the second link unit 602, and the third link unit 603 are provided and are respectively located on both sides outside the seat cushion frame 20 to improve the smoothness of the switching of the dental chair between the folded and unfolded states.

[0040] In this embodiment, as Figure 8 shown, the outside of the seat cushion frame 20 is covered with a seat cushion layer 71. The seat cushion layer 71 can cover the seat cushion frame 20 and at least part of the leg support 30. The outside of the backrest frame 40 is covered with a backrest layer 72. The seat cushion layer 71 and the backrest layer 72 can be protective layers with sponge inside and PU material outside, making the dental chair soft. A headrest 73 is provided at one end of the backrest frame 40 away from the seat cushion frame 20. The headrest 73 is used to support the patient's neck and head.

[0041] In order to further improve the patient's comfort during treatment, the dental chair also includes an airbag system, which includes a first inflatable member 81 arranged on the cushion layer 71 and a second inflatable member 82 arranged on the backrest layer 72. The first inflatable member 81 and the second inflatable member 82 are elastic and can increase in volume when gas enters the interior and decrease in volume when the internal gas is discharged. The first inflatable member 81 and the second inflatable member 82 can be made of a hollow rubber material. Specifically, the first inflatable member 81 is arranged on the side of the cushion layer 71 close to the backrest frame 40, so that the first inflatable member 81 can support the patient's waist, so that when the patient lies down, the first inflatable member 81 expands to the required volume according to actual needs and supports the patient's waist, avoiding the patient's waist from being suspended in the air, and also avoiding the patient from sliding due to reasons such as the tilt of the cushion; the second inflatable member 82 is arranged on the side of the backrest layer 72 close to the headrest 73, so that the first inflatable member 81 can support the patient's shoulders, specifically the upper side of the shoulders, so that when the patient lies down, the second inflatable member 82 expands to the required volume according to actual needs, further avoiding the patient from sliding, so that the second inflatable member 82 plays a role in positioning the patient's body position, and the patient does not need to repeatedly adjust the position after lying down due to incorrect body position during treatment.

[0042] Preferably, if Figure 8 As shown, the first inflatable member 81 extends along the width direction of the dental chair to both sides of the cushion layer 71 in the width direction of the dental chair, and the second inflatable member 82 extends along the width direction of the dental chair to both sides of the backrest layer 72 in the width direction of the dental chair. This is adapted to patients of different body shapes, ensuring the effectiveness and reliability of preventing patients from slipping and positioning patients when lying down.

[0043] Furthermore, in this embodiment, an inflation cavity is formed inside the first inflatable member 81 and the second inflatable member 82; the airbag system also includes a control valve connected to the inflation cavity, which can be a solenoid valve. The control valve has an inflation mode for controlling the entry of gas into the inflation cavity of the first inflatable member 81 or the second inflatable member 82, a deflation mode for controlling the discharge of gas in the inflation cavity of the first inflatable member 81 or the second inflatable member 82, and a closing mode for preventing external gas from entering the inflation cavity or the discharge of gas in the inflation cavity. In this way, the doctor can control the expansion volume of the first inflatable member 81 or the second inflatable member 82 according to actual needs to meet the comfort needs of patients of different body shapes. Preferably, the control valve is in communication with the driver 50. When the driver 50 deploys the dental chair, the first and second inflatable members 81, 82 expand with the dental chair. This allows the inflatable members 81 and 82 to support and position the patient after the patient lies down. It should be noted that the physician can choose to disconnect the control valve from the driver 50 based on actual needs, providing more options for physicians to tailor the comfort needs of patients of varying body types.

[0044] According to the dental chair of the present invention, the chair frame assembly includes a fixed frame, a seat cushion frame, and a leg support bracket. The seat cushion frame is rotatably connected to the fixed frame, and the leg support bracket is rotatably connected to the seat cushion frame; the driving assembly includes a driving member installed on the seat cushion frame and a linkage assembly installed on the fixed frame. The linkage assembly includes a rotating member and a first link unit. A first output end for driving the leg support bracket to rotate relative to the seat cushion frame is formed on the rotating member. The first link unit is respectively rotatably connected to the first output end and the leg support bracket; when the driving member expands and contracts, it can drive the rotating member to rotate. The rotation center line of the rotating member passes through point E. The first link unit is rotatably connected to the first output end at point F, and the first link unit is rotatably connected to the leg support bracket at point G; when the rotating member rotates to convert the dental chair from the folded state to the unfolded state, the first output end pushes the first link unit, and the distance between point F and the connection line EG formed by points E and G first decreases and then increases as point F moves downward from top to bottom, so that the rotation angle of the leg support bracket relative to the seat cushion frame first increases and then decreases, realizing the first unfolding and then retracting of the leg support bracket. In this way, after the dental chair is fully unfolded, the patient's legs can be slightly bent instead of fully straightened, and the whole leg will not be in a state of tilting upward, improving the comfort of the patient during the treatment process.

[0045] According to a dental chair control method provided in the second aspect of the present invention, it is applied to the dental chair as described above. The airbag system has a linkage control mode and an independent control mode; In the linkage control mode, the control valve is communicatively connected to the driving member, so that the airbag system can identify the movement position of the driving member. When the driving member is driven to 1 / 2 of the total stroke, the control valve opens and slowly inflates the first inflating member and the second inflating member; When the driving member stops driving and the driving member moves to 1 / 5 of the total stroke at this time, both the first inflating member and the second inflating member are inflated to the preset maximum inflation amount (the preset maximum inflation amount is the maximum inflation amount set to avoid the explosion of the first inflating member and the second inflating member and ensure the safe use of the first inflating member and the second inflating member. The preset maximum inflation amount of the first inflating member and the preset maximum inflation amount of the second inflating member can be the same or different). At this time, the control valve closes the inflation mode, and during the subsequent contraction of the driving member, the control valve continues to remain closed; When the driving member stops driving and the driving member moves to 1 / 5 to 1 / 2 of the total stroke at this time, if the driving member is in the contraction state, the control valve opens the inflation mode; if the driving member is in the unfolded state, the control valve opens the deflation mode; When the driving member moves to a stroke outside 1 / 5 to 1 / 2 of the total stroke, the control valve closes, and at this time, neither inflation nor deflation occurs. In the linkage control mode, it can be better adapted to the driving assembly in the dental chair as described above, and the unfolded state of the leg bracket and the inflation states of the first inflating member and the second inflating member can be adapted when adjusting the treatment chair position of the patient.

[0046] In the linkage control mode, the control valve is not connected to the driving member. Specifically, the doctor can cancel the communication connection relationship between the control party and the driving member in the depression control interface, so that the inflation or deflation states of the first inflating member and the second inflating member can be adjusted according to actual needs to meet the comfort requirements of patients with different body types.

[0047] In the dental chair control method of the present invention, the doctor can select the airbag system to be in the linkage control mode and the independent control mode according to actual needs, further improving the comfort of the patient during the treatment process.

[0048] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, rather than limiting them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed in the present application can still modify the technical solutions described in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; 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 all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims

1. A dental chair, characterized in that, The dental chair includes: A chair frame assembly, including a fixed frame, a seat cushion frame, and a leg support frame. The seat cushion frame is rotatably connected to the fixed frame, and the leg support frame is rotatably connected to the seat cushion frame; A drive assembly, including a drive member installed on the seat cushion frame and a linkage assembly installed on the fixed frame. The linkage assembly includes a rotating member and a first link unit. A first output end for driving the leg support frame to rotate relative to the seat cushion frame is formed on the rotating member, and the first link unit is rotatably connected to the first output end and the leg support frame respectively; When the drive member expands and contracts, it can drive the rotating member to rotate. The rotation center line of the rotating member passes through point E. The first link unit is rotatably connected to the first output end at point F, and the first link unit is rotatably connected to the leg support frame at point G. When the rotating member rotates to cause the leg support frame to convert the dental chair from a folded state to an unfolded state, the first output end pushes the first link unit, and the distance between point F and the line EG formed by connecting point E and point G first decreases and then increases, so that the rotation angle of the leg support frame relative to the seat cushion frame first increases and then decreases.

2. The dental chair according to claim 1, characterized in that, When the distance between point F and the line EG gradually decreases as point F moves downward, the distance between point E and point G gradually increases, realizing an increase in the angle between the leg support frame and the seat cushion frame. Until point F moves downward to be collinear with the line EG, the leg support frame expands to the maximum rotation angle relative to the seat cushion frame. The first output end continues to push the first link unit to drive point F to continue to move downward, so that the distance between the line connecting point F and the line EG gradually increases. At this time, the distance between point E and point G gradually decreases, realizing a decrease in the rotation angle of the leg support frame relative to the seat cushion frame.

3. The dental chair according to claim 1, characterized in that, After the rotation angle of the leg support frame relative to the seat cushion frame decreases, the end of the leg support frame away from the seat cushion frame is not higher than the end where the leg support frame is rotatably connected to the seat cushion frame.

4. The dental chair according to claim 1, characterized in that, The linkage assembly further includes a second link unit. A second output end for driving the seat cushion frame to rotate relative to the fixed frame is formed on the rotating member, and the second link unit is rotatably connected to the second output end and the seat cushion frame respectively; When the leg support frame rotates relative to the seat cushion frame, the seat cushion frame rotates relative to the fixed frame.

5. The dental chair according to claim 1, characterized in that, The chair frame assembly further includes a backrest frame rotatably connected to the seat cushion frame. The backrest frame is provided at an end of the seat cushion frame away from the leg support frame; The linkage assembly further includes a third link unit. A third output end for driving the backrest frame to rotate relative to the seat cushion frame is formed on the rotating member, and the third link unit is rotatably connected to the third output end and the backrest frame respectively; when the backrest frame rotates downward, the leg support frame expands accordingly.

6. The dental chair according to claim 1, characterized in that, The rotating member includes a rod portion, an input portion, and an output portion. The input portion and the output portion are both fixedly connected to the rod portion. The driving member is rotatably connected to an end of the input portion away from the rod portion. The first output end is disposed on the output portion and is spaced apart from the rotation center of the rotating member.

7. The dental chair according to claim 5, characterized in that, The outer surface of the seat cushion frame is covered with a seat cushion layer, and the outer surface of the backrest frame is covered with a backrest layer. A headrest is provided at an end of the backrest frame away from the seat cushion frame. The dental chair further includes: An airbag system, including a first inflating member disposed on the seat cushion layer and a second inflating member disposed on the backrest layer. The first inflating member is disposed on a side of the seat cushion layer close to the backrest frame; the second inflating member is disposed on a side of the backrest layer close to the headrest.

8. The dental chair according to claim 7, characterized in that, The first inflating member extends along the width direction of the dental chair to both sides of the seat cushion layer in the width direction of the dental chair, and the second inflating member extends along the width direction of the dental chair to both sides of the backrest layer in the width direction of the dental chair.

9. The dental chair according to claim 7, characterized in that, An inflating cavity is formed inside both the first inflating member and the second inflating member; the airbag system further includes a control valve communicated with the inflating cavity.

10. A dental chair control method, characterized in that, Applied to the implementation of the dental chair according to claim 9; the airbag system has a linkage control mode and an independent control mode; In the linkage control mode, the control valve is communicatively connected to the driving member, so that the airbag system can identify the movement position of the driving member. When the driving member is driven to a 1 / 2 stroke of the total stroke, the control valve opens and inflates the first inflating member and the second inflating member. When the driving member stops driving and the driving member moves to a 1 / 5 stroke of the total stroke at this time, both the first inflating member and the second inflating member are inflated to a preset maximum inflation amount. At this time, the control valve closes the inflation mode, and during the subsequent contraction of the driving member, the control valve continues to remain closed. When the driving member stops driving and the driving member moves to a stroke between 1 / 5 and 1 / 2 of the total stroke at this time, if the driving member is in a contracted state, the control valve opens the inflation mode; if the driving member is in an extended state, the control valve opens the deflation mode. When the driving member moves to a stroke outside the range of 1 / 5 to 1 / 2 of the total stroke, the control valve closes, and at this time, neither inflation nor deflation occurs. In the linkage control mode, the control valve is not connected to the driving member.

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