Dental chair linkage system and dental chair

Abstract

The present application relates to the technical field of medical apparatus, in particular to a dental chair linkage system and a dental chair, the dental chair linkage system comprising: a frame body comprising a fixed frame, a backrest frame and a seat cushion frame, the seat cushion frame being rotatably connected to the fixed frame, and the backrest frame being rotatably connected to the seat cushion frame; a driving assembly comprising a connecting rod mechanism and a driving piece; the connecting rod mechanism is installed on the fixed frame and comprises a first output end for driving the backrest frame, a second output end for driving the seat cushion frame and an input end, the main body of the driving piece is rotatably connected to the seat cushion frame, and the driving end of the driving piece is rotatably connected to the input end to drive the connecting rod mechanism when the driving end slides relative to the main body of the driving piece. The driving piece indirectly drives the rotation of the seat cushion frame relative to the fixed frame and the rotation of the backrest frame relative to the seat cushion frame through the connecting rod mechanism, shortens the stroke of the driving end, reduces the size of the driving piece, facilitates the installation and layout of the driving piece in the dental chair, and realizes the reduction of the size of the dental chair.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a dental chair linkage system and a dental chair. Background Technology

[0002] A dental chair, also known as a dental treatment chair, is used to treat dental diseases. Common dental chairs require adjustments to the backrest and seat angles to accommodate different treatment positions. Chinese patent CN202311819573.2 discloses a three-fold chair with a drive mechanism mounted on the seat and backrest at one end. This mechanism directly drives the backrest relative to the seat. This structure results in an excessively large stroke for the drive mechanism, increasing its size and requiring more installation space. This makes it difficult to install inside the dental chair, contributing to the overall large size of the dental chair. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a dental chair linkage system and a dental chair to solve the problem that in existing dental chairs, the relative movement between the backrest and the seat cushion is directly driven by a drive mechanism, resulting in an excessively large stroke and size of the drive mechanism, which is not conducive to installation inside the dental chair and causes the overall size of the dental chair to be large.

[0004] A first aspect of the present invention provides a dental chair linkage system, wherein the dental chair linkage system includes: The frame includes a fixed frame, a backrest frame, and a seat cushion frame, wherein the seat cushion frame is rotatably connected to the fixed frame, and the backrest frame is rotatably connected to the seat cushion frame; A drive assembly includes a linkage mechanism and a drive member; the linkage mechanism is mounted on the fixed frame and includes a first output end for driving the backrest frame, a second output end for driving the seat cushion frame, and an input end; the main body of the drive member is rotatably connected to the seat cushion frame, and the drive end of the drive member is rotatably connected to the input end to drive the linkage mechanism when the drive end slides relative to the main body of the drive member.

[0005] Preferably, the linkage mechanism includes: A rotating rod is rotatably connected to the fixed frame; the first output end and the input end are fixedly connected to the rotating rod. In the radial direction of the rotating rod, the distance between the first output end and the rotation center of the rotating rod is greater than the distance between the input end and the rotation center of the rotating rod, and / or in the radial direction of the rotating rod, the distance between the second output end and the rotation center of the rotating rod is less than the distance between the input end and the rotation center of the rotating rod.

[0006] Preferably, the linkage mechanism includes a drive rod, a rotating block, a first linkage unit, and a second linkage unit; The first output terminal and the second output terminal are disposed on the rotating block; one end of the first linkage unit is connected to the first output terminal and the other end is connected to the backrest frame; one end of the second linkage unit is connected to the second output terminal and the other end is connected to the seat cushion frame. The input end is disposed on the drive rod, the drive component is rotatably connected to the drive rod, the drive component and the drive rod are disposed inside the seat cushion frame, and the rotating block, the first connecting rod unit and the second connecting rod unit are disposed outside the seat cushion frame.

[0007] Preferably, the frame further includes a leg support rotatably connected to the seat cushion frame, the leg support being disposed on the side of the seat cushion frame away from the backrest frame, and the linkage mechanism further includes a third linkage unit disposed outside the seat cushion frame and a third output end for driving the leg support, the third output end being disposed on the rotating block, one end of the third linkage unit being connected to the third output end, and the other end being connected to the leg support.

[0008] Preferably, the fixing frame has a protruding mounting portion, and the seat cushion frame is rotatably connected to the mounting portion; the rotating rod is installed on the side of the mounting portion facing the seat cushion frame, and the end of the rotating rod in the length direction passes through the mounting portion; the rotating block is fixedly connected to the rotating rod on the side of the mounting portion facing away from the seat cushion frame; and the first connecting rod unit, the second connecting rod unit, and the third connecting rod unit are arranged on the side of the mounting portion facing away from the seat cushion frame.

[0009] Preferably, there are two rotating blocks, which are respectively installed at both ends of the rotating rod along its length; the first connecting rod unit, the second connecting rod unit and the third connecting rod unit are each provided in two sets, and are arranged opposite to each other on both sides of the seat cushion frame. Preferably, the drive member is disposed inside the seat cushion frame and close to one side of the inner wall of the seat cushion frame to form an installation space inside the seat cushion frame, the installation space being disposed to the side of the drive member in the horizontal direction; a portion of the fixing bracket protrudes upward and extends into the top of the installation space to form a clearance position; The dental chair linkage system also includes: The lifting mechanism has a lifting end that can extend into the clearance position and be fixed to the top of the clearance position.

[0010] Preferably, the clearance position includes a top plate and a side plate. The top plate is disposed inside the seat cushion frame. The side plate connects the top plate and the main body of the fixing frame in the vertical direction. The lifting end is installed on the lower surface of the top plate. The upper surface of the top plate is close to or flush with the upper surface of the seat cushion frame.

[0011] Preferably, it further includes: The elastic component has two ends in the extension direction connected to the rotating block and the fixed frame, respectively, and the extension line of the elastic component in the extension direction does not intersect the rotation center line of the rotating rod.

[0012] A second aspect of the present invention provides a dental chair, including the dental chair linkage system described in any of the above technical solutions.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In the dental chair linkage system of the present invention, the frame includes a fixed frame, a backrest frame, and a seat cushion frame. The seat cushion frame is rotatably connected to the fixed frame, and the backrest frame is rotatably connected to the seat cushion frame. The drive assembly includes a linkage mechanism and a drive component. The linkage mechanism is mounted on the fixed frame and includes a first output end for driving the backrest frame, a second output end for driving the seat cushion frame, and an input end. The main body of the drive component is rotatably connected to the seat cushion frame, and the drive end of the drive component is rotatably connected to the input end, so as to drive the linkage mechanism when the drive end slides relative to the main body of the drive component, thereby realizing the unfolding or folding of the dental chair. The drive component of the present invention indirectly drives the rotation of the seat cushion frame relative to the fixed frame and the rotation of the backrest frame relative to the seat cushion frame through the linkage mechanism. Compared with the traditional direct drive structure, it shortens the stroke of the drive end, reduces the volume of the drive component, and facilitates the installation layout of the drive component in the dental chair, thereby reducing the volume of the dental chair and improving its aesthetics.

[0014] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the dental chair linkage system provided in the embodiment of the present invention in a low chair folding state; Figure 2 A top view of the dental chair linkage system provided in the embodiment of the present invention in a low chair folding state; Figure 3 A schematic diagram of the dental chair linkage system provided in the embodiment of the present invention in the high chair folding state; Figure 4A cross-sectional view of the dental chair linkage system provided in the embodiment of the present invention in a low chair folding state; Figure 5 A schematic diagram of the dental chair linkage system provided in the embodiment of the present invention in a low, semi-exposed chair position; Figure 6 A schematic diagram of the dental chair linkage system provided in the embodiment of the present invention in the fully extended low chair position; Figure 7 A cross-sectional view of the dental chair linkage system provided in the embodiment of the present invention in the fully extended low chair position.

[0017] Icons: 11-Fixed frame; 111-Avoidance position; 1111-Top plate; 1112-Side plate; 112-Mounting part; 113-Extension part; 12-Backrest frame; 13-Seat cushion frame; 131-Guide groove; 132-Mounting space; 133-Reinforcing member; 14-Leg support; 20-Linkage mechanism; 200-Input end; 201-First output end; 202-Second output end; 203-Third output end; 21-Rotating rod; 22-Drive rod; 23-Rotating block; 211-First linkage unit; 212-Second linkage unit; 213-Third linkage unit; 30-Driver; 31-Drive end; 40-Lifting mechanism; 41-Lifting end; 50-Elastic component. Detailed Implementation

[0018] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0019] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0020] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0021] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0022] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0023] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that 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 relation terms used herein will be interpreted accordingly.

[0024] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0025] Variations in the shapes shown in the accompanying 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 accompanying drawings, but include changes in shape that may occur during manufacturing.

[0026] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0027] According to a first aspect of the present invention, a dental chair linkage system includes a frame and a drive assembly.

[0028] The specific structure of the above-described components of the dental chair linkage system according to this embodiment will be described below.

[0029] In this embodiment, as Figures 1 to 6 As shown, the frame includes a fixed frame 11, a backrest frame 12, and a seat cushion frame 13. The seat cushion frame 13 is rotatably connected to the fixed frame 11. Specifically, the fixed frame 11 is formed as a plate-like structure extending horizontally, and the seat cushion frame 13 is positioned above the fixed frame 11. Thus, by driving the seat cushion frame 13 to rotate relative to the fixed frame 11, the posture angle of the patient's buttocks can be adjusted. The backrest frame 12 is rotatably connected to the seat cushion frame 13, thus, by adjusting the angle between the backrest frame 12 and the seat cushion frame 13, the dental chair can be switched between folded and unfolded states. Figures 1 to 4 The frame shown is in a folded state, at which point the backrest frame 12 and the seat cushion frame 13 are positioned at approximately 90°, as... Figure 5 The frame shown is in a semi-open state, at which point the included angle between the backrest frame 12 and the seat cushion frame 13 is relative to... Figures 1 to 4 The folding state increases, such as Figure 6 The frame shown is in its fully extended state, at which point the angle between the backrest frame 12 and the seat cushion frame 13 is relative to... Figure 5 The semi-expanded state further increases, and it expands to its limit position.

[0030] In this embodiment, as Figure 1 , Figures 3 to 5As shown, the drive assembly is used to adjust the angle of the frame between the folded state and the fully unfolded state. Specifically, the drive assembly includes a linkage mechanism 20 and a drive component 30. The drive component 30 can be a mechanism such as an electric push rod or a pneumatic push rod that can realize linear telescopic motion.

[0031] The linkage mechanism 20 is mounted on the fixed frame 11. Specifically, the linkage mechanism 20 includes a first output end 201 for driving the backrest frame 12, a second output end 202 for driving the seat cushion frame 13, and an input end 200. The main body of the driving member 30 is rotatably connected to the seat cushion frame 13, and the driving end 31 of the driving member 30 is rotatably connected to the input end 200 so as to drive the linkage mechanism 20 when the driving end 31 slides relative to the main body of the driving member 30, thereby realizing the angle adjustment of the dental chair between the unfolded and folded states. The driving member 30 is not directly connected to the frame, but indirectly drives the rotation of the seat cushion frame 13 relative to the fixed frame 11 and the rotation of the backrest frame 12 relative to the seat cushion frame 13 through the linkage mechanism 20. Compared with the traditional direct drive structure, the stroke of the driving end 31 is shortened, the volume of the driving member 30 is reduced, which helps the installation layout of the driving member 30 in the dental chair, thereby reducing the volume of the dental chair and improving its aesthetics.

[0032] Furthermore, in this embodiment, as Figures 1 to 5 As shown, the linkage mechanism 20 includes a rotating rod 21, which is formed into a rod-like structure, such as a cylindrical rod-like structure. The axis of the cylinder is the rotation center line of the rotating rod 21. However, the structure of the rotating rod 21 is not limited to this, as long as it can achieve rotation. The rotating rod 21 is rotatably connected to the fixed frame 11 to fix the position of the rotating rod 21 relative to the fixed component. The first output end 201 and the input end 200 are fixedly connected to the rotating rod 21, that is, the first output end 201 and the input end 200 can rotate synchronously with the rotation of the rotating rod 21. This enables the backrest frame 12 to rotate downwards when needed (i.e., from the...). Figure 1 The state is rotated to Figure 5 or Figure 6 (In the state), the driving component 30 drives the input end 200 to rotate, thereby transmitting power to the rotating rod 21, realizing the control of the first output end 201 to rotate, and finally realizing the rotation of the backrest frame 12 relative to the seat cushion frame 13.

[0033] Preferably, such as Figure 3 and Figure 4As shown, in the radial direction of the rotating rod 21 (i.e., in the direction perpendicular to the rotation center line of the rotating rod 21), the distance between the first output end 201 and the rotation center of the rotating rod 21 is greater than the distance between the input end 200 and the rotation center of the rotating rod 21. Thus, when the driving member 30 drives the backrest frame 12 to rotate relative to the seat cushion frame 13, since the distance between the input end 200 and the rotation center of the rotating rod 21 is smaller than that between the first output end 201 and the rotating rod 21, the actual displacement generated by the driving end 31 is less than the relative displacement generated by the backrest frame 12. This reduces the required stroke of the driving member 30, and correspondingly, the space reserved for the extension and retraction of the driving member 30 in the dental chair can be relatively reduced, making it easier for the driving member 30 to be arranged in the dental chair.

[0034] Furthermore, the distance between the first output end 201 and the rotation center of the rotating rod 21 is 1.5 to 2.5 times, preferably 1.8 times, the distance between the input end 200 and the rotation center of the rotating rod 21. This ensures that the load-bearing capacity and stroke of the drive component 30 meet the requirements of the folding and unfolding range of the dental chair and are suitable for installation inside the dental chair.

[0035] In this embodiment, as Figures 1 to 6 As shown, a guide groove 131 is provided on the seat cushion frame 13. The guide groove 131 is provided on the side walls on both sides of the seat cushion frame 13. The guide groove 131 is arc-shaped. The backrest frame 12 can move along the extension trajectory of the guide groove 131 while rotating relative to the seat cushion frame 13, so that the backrest frame 12 has both rotation and movement components.

[0036] The specific figures are listed below to more intuitively illustrate the effect of the structure of this application on reducing the stroke of the drive component 30. See also Figure 4 As shown, the drive component 30 is rotatably connected to the seat cushion frame 13 at point A, and the drive component 30 is rotatably connected to the rotating rod 21 at point B. The backrest component is rotatably connected to the backrest frame 12 in the arc-shaped guide groove 131 at point C. The line AB is the actual length of the drive component 30 (i.e., Lreal), and the line AC is the length of the drive mechanism when it directly drives the backrest frame 12 (i.e., Lvirtual). Figure 4 Rotate to Figure 7 During the process, the angle change value of the backrest frame 12 is β, and the actual measurement is in Figure 4 In the state, L 实1 =360mm, L 虚1 =475mm; in Figure 7 In the state, L 实2 =275mm, L 虚2 =288mm, therefore the frame in this application is made of Figure 4 Rotate to Figure 7 In this state, the stroke of the drive component 30 is L. 实1 - L 实2=360mm-275mm=85mm, while the stroke required for the traditional drive mechanism to directly drive the backrest frame 12 to rotate the same angle is L. 虚1 - L 虚2 =475mm-288mm=187mm. It can be seen that in order to achieve the same rotation angle β, the indirect drive structure of this application shortens the drive stroke by 102mm compared with the traditional direct drive structure.

[0037] Preferably, to ensure patient comfort, the tilt angle of the seat cushion 13 should not be too large, such as... Figure 3 and Figure 4 As shown, in the radial direction of the rotating rod 21, the distance between the second output end 202 and the rotation center of the rotating rod 21 is less than the distance between the input end 200 and the rotation center of the rotating rod 21. This arrangement ensures that the position of the second output end 202 can meet the small rotation requirements of the seat cushion frame 13. It should be noted that the second output end 202 drives the rotation of the seat cushion frame 13 through the second connecting rod described below.

[0038] Furthermore, in this embodiment, as Figures 1 to 5 As shown, the linkage mechanism 20 includes a drive rod 22, a rotating block 23, a first linkage unit 211, and a second linkage unit 212. The drive rod 22 can be formed into a rod-shaped structure, and the input end 200 is disposed on the drive rod 22. Specifically, the input end 200 can be disposed at the end of the drive rod 22 away from the rotating rod 21 in the length direction. The drive member 30 is rotatably connected to the drive rod 22. Specifically, the drive end 31 is rotatably connected to the drive rod 22. The first output end 201 and the second output end 202 are disposed on the rotating block 23. The rotating block 23 can be formed into a plate-like structure or a block-like structure. The first output end 201 and the second output end 202 can form hinge holes opened on the rotating block 23. One end of the first linkage unit 211 is connected to the first output end 201, and the other end of the first linkage unit 211 is connected to the backrest frame 12. One end of the second linkage unit 212 is connected to the second output end 202, and the other end of the second linkage unit 212 is connected to the seat cushion frame 13. Both ends of the first linkage unit 211 and the second linkage unit 212 are rotatably connected. Thus, when the driving member 30 drives the driving rod 22 to rotate, the power is transmitted to the rotating block 23 through the rotating rod 21. The rotation of the rotating block 23 drives the first linkage unit 211 and the second linkage unit 212 to rotate, thereby realizing the rotational drive of the seat cushion frame 13 and the backrest frame 12.

[0039] More specifically, the drive element 30 and drive rod 22 are located inside the seat cushion frame 13, while the rotating block 23, the first linkage unit 211, and the second linkage unit 212 are located outside the seat cushion frame 13. This reduces the volume of the seat cushion frame 13 and lowers the strength requirements. If all the linkage mechanisms 20 are located on the same side, the first linkage unit 211 and the second linkage unit 212, respectively, form a cantilever beam structure with the rotating connection parts of the seat cushion frame 13 and the backrest frame 12, which requires higher strength to ensure stability. It should be noted that the rotating rod 21 is installed inside the seat cushion frame 13, and its length end extends out of the seat cushion frame 13 and connects to the rotating block 23.

[0040] In addition, the frame also includes a leg rest 14, which supports the patient's legs. In an optional embodiment, the seat cushion 13 and the leg rest 14 are integrated, such that the angle between the seat cushion 13 and the leg rest 14 is not adjustable.

[0041] In a preferred embodiment, such as Figures 1 to 6 As shown, the leg rest 14 is located on the side of the seat cushion frame 13 away from the backrest frame 12 and is rotatably connected to the seat cushion frame 13. This allows adjustment of the angle between the leg rest 14 and the seat cushion frame 13, making the patient more comfortable when lying down and facilitating the patient's movement up and down the dental chair. Specifically, the linkage mechanism 20 also includes a third linkage unit 213 located on the outside of the seat cushion frame 13 and a third output end 203 for driving the leg rest 14. The third output end 203 is located on the rotating block 23. The third output end can be a hinge hole structure opened on the rotating block 23. One end of the third linkage unit 213 is connected to the third output end 203, and the other end of the third linkage unit 213 is connected to the leg rest 14. Thus, when the driving member 30 drives the driving rod 22 to rotate, the power is transmitted to the rotating block 23 via the rotating rod 21. The rotation of the rotating block 23 drives the third linkage unit 213 to rotate, thereby realizing the rotational drive of the leg rest 14.

[0042] In this embodiment, the structure of the first link unit 211, the second link unit 212 and the third link unit 213 can be a single rod, or a combination of multiple rotatably connected rods, or a plate structure or a combination of a plate structure and a rod structure rotatably connected. As long as the power can be transmitted to the seat frame 13, the backrest frame 12 and the leg support frame 14 when the rotating block 23 rotates, the chair can be unfolded or folded.

[0043] In a preferred embodiment, such as Figures 1 to 6As shown, there are two rotating blocks 23, which are respectively installed at both ends of the rotating rod 21 along its length. The first linkage unit 211, the second linkage unit 212 and the third linkage unit 213 are each provided in two sets and are arranged opposite each other on both sides of the seat cushion frame 13. That is, in the linkage mechanism 20, all components except the drive rod 22 and the rotating rod 21 are arranged in pairs on both sides of the seat cushion frame 13, thereby improving the stability and reliability of the linkage mechanism 20 in driving the seat cushion frame 13, the backrest frame 12 and the leg support frame 14. Furthermore, in this embodiment, as Figure 1 and Figures 3 to 5 As shown, a protruding mounting portion 112 is formed on the fixing frame 11. The mounting portion 112 is formed into a plate-like structure and is disposed above the fixing member. Preferably, there are two mounting portions 112, which are spaced apart in the width direction of the dental chair. Both the seat frame 13 and the rotating rod 21 are rotatably connected to the mounting part 112. In the horizontal direction, the rotating rod 21 is installed on the side of the mounting part 112 facing the seat frame 13, and the end of the rotating rod 21 in the length direction passes through the mounting part 112 so that the end extends to the side of the mounting part 112 away from the seat frame 13. The rotating block 23 is fixedly connected to the rotating rod 21 on the side of the mounting part 112 away from the seat frame 13. The first linkage unit 211, the second linkage unit 212 and the third linkage unit 213 are arranged on the side of the mounting part 112 away from the seat frame 13. In this way, all other components in the linkage mechanism 20 except for the rotating part and the drive rod 22 are arranged on both sides of the fixed frame 11, so as to avoid interference with the mechanism or components installed inside the seat frame 13 when rotating.

[0044] In this embodiment, as Figures 2 to 4 and Figure 6As shown, the drive member 30 is disposed inside the frame structure of the seat cushion 13 and is located close to one inner wall of the seat cushion 13. That is, the drive member 30 is installed along the side of the seat cushion 13 to form an installation space 132 inside the seat cushion 13. The installation space 132 is located on the side of the drive member 30 in the horizontal direction, thereby reserving a position in the middle of the interior of the seat cushion 13. Part of the fixing frame 11 protrudes upward and extends into the top of the installation space 132 to form a clearance position 111 on the fixing frame 11. The clearance position 111 may be an opening in the fixing frame 11, and multiple plate-like structures may surround the opening position above it. The chair linkage system also includes a lifting mechanism 40 for driving the seat cushion 13 to move up and down to adjust the height of the seat cushion 13 from the ground. The lifting mechanism 40 can... It can be a telescopic motor, telescopic cylinder, or motor screw, as long as it can drive the seat frame 13 to rise and fall. The lifting mechanism 40 is installed on the base of the dental chair and has a lifting end 41 that can extend into the relief position 111 and is fixed to the top of the relief position 111. Due to the installation structure of the drive component 30 and the linkage mechanism 20, enough space is reserved in the middle of the interior of the seat frame 13 so that the lifting end 41 extends into the seat frame 13 together with the relief position 111. Moreover, the top of the relief position 111 can be close to the top of the seat frame 13. Since the extension distance of the relief position 111 into the seat frame 13 is long enough, the distance between the upper surface of the seat frame 13 and the ground is closer, so that the overall height of the dental chair is lower when it is in the lowest position, which makes it easier for the elderly, children and other groups who need special care to get in and out of the dental chair.

[0045] It should be noted that, in Figure 2 As can be seen from the perspective shown, the drive unit 30 and the clearance position 111 are staggered, so that the installation position of the drive unit 30 does not need to be considered when setting the clearance position 111.

[0046] Specifically, in this embodiment, such as Figure 4 As shown, the clearance position 111 includes a top plate 1111 and a side plate 1112. The top plate 1111 is located inside the seat cushion frame 13. The side plate 1112 connects the top plate 1111 and the main body of the fixing frame 11 in the vertical direction. The lifting end 41 is installed on the lower surface of the top plate 1111. The upper surface of the top plate 1111 is close to the upper surface of the seat cushion frame 13 (preferably, the upper surface of the top plate 1111 is located below the upper surface of the seat cushion frame 13 to avoid interference between the clearance position 111 and the components in the dental chair), or the upper surface of the top plate 1111 is flush with the upper surface of the seat cushion frame 13. In this way, the lifting mechanism 40 directly drives the top plate 1111 located inside the seat cushion frame 13 to perform lifting and lowering movements, so that the distance between the upper surface of the seat cushion frame 13 and the ground is closer, and the overall height of the dental chair is lower when it is in the lowest position.

[0047] Optionally, the minimum vertical distance between the upper surface of the seat cushion 13 and the upper surface of the clearance position 111 (i.e., the upper surface of the top plate 1111) is 0, so that the overall height of the chair is reduced to the lowest position.

[0048] Preferably, a reinforcing member 133 is provided on the seat cushion frame 13. The reinforcing member 133 is formed into a plate-like structure to improve the structural strength of the seat cushion frame 13. The thickness of the reinforcing member 133 is H, in mm. H can be 10 mm. The minimum vertical distance between the upper surface of the clearance position 111 and the upper surface of the seat cushion frame 13 is H+5 mm to avoid interference. This arrangement makes the minimum height of the dental chair seat cushion position = the height of the dental chair base + the minimum height of the lifting mechanism 40 + the thickness of the seat cushion cotton placed on the seat cushion frame 13 + H+5 mm, so as to facilitate the use of dental chairs for the elderly, children and other groups that need special care.

[0049] It should be noted that in the embodiment without reinforcement 133, the minimum vertical distance between the upper surface of the clearance position 111 and the upper surface of the seat cushion frame 13 can be 5mm, or it can be set to other parameters as needed, so that the upper surface of the top plate 1111 is close to or flush with the upper surface of the seat cushion frame 13.

[0050] Furthermore, in this embodiment, such as Figure 6 As shown, the dental chair linkage system also includes an elastic component 50. The two ends of the elastic component 50 in its extension and retraction direction are respectively connected to the rotating block 23 and the fixed frame 11. The extension line of the elastic component 50 in the extension and retraction direction does not intersect with the rotation center line of the rotating rod 21, thus ensuring that the torque of the elastic component 50 relative to the rotation center of the rotating rod 21 is never zero.

[0051] Specifically, such as Figure 6 As shown, the bottom of the fixing frame 11 has a downwardly extending extension 113, which is formed as a plate-like structure, and the elastic member 50 is mounted on the extension 113.

[0052] In this embodiment, the elastic component 50 can be a gas spring. During installation, the elastic component 50 is always in a compressed state. The compressed state of the elastic component 50 can apply a force to the rotating block 23 and the rotating rod 21, so that the rotating block 23 and the rotating rod 21 maintain a position that tends to move the backrest frame 12 and the leg support 14 towards... Figure 1 The folded state is shown.

[0053] Furthermore, since the linkage mechanism 20 has a clearance and the drive component 30 is prone to misalignment, the elastic component 50 applies a force (tension) to the linkage mechanism 20. Through the elastic action of the elastic component 50, the clearance is filled and the misalignment is offset, thereby making the movement of the linkage mechanism 20 more stable and precise, effectively solving the swaying problem and improving the operational stability and reliability of the entire structure.

[0054] According to the dental chair linkage system of the present invention, the frame includes a fixed frame, a backrest frame, and a seat cushion frame. The seat cushion frame is rotatably connected to the fixed frame, and the backrest frame is rotatably connected to the seat cushion frame. The drive assembly includes a linkage mechanism and a drive member. The linkage mechanism is mounted on the fixed frame and includes a first output end for driving the backrest frame, a second output end for driving the seat cushion frame, and an input end. The main body of the drive member is rotatably connected to the seat cushion frame, and the drive end of the drive member is rotatably connected to the input end, so as to drive the linkage mechanism when the drive end slides relative to the main body of the drive member, thereby realizing the unfolding or folding of the dental chair. The drive member of the present invention indirectly drives the rotation of the seat cushion frame relative to the fixed frame and the rotation of the backrest frame relative to the seat cushion frame through the linkage mechanism. Compared with the traditional direct drive structure, it shortens the stroke of the drive end, reduces the volume of the drive member, and facilitates the installation layout of the drive member in the dental chair.

[0055] According to the present invention, a dental chair includes the aforementioned dental chair linkage system. In the dental chair linkage system, the driving component indirectly drives the rotation of the seat cushion frame relative to the fixed frame and the rotation of the backrest frame relative to the seat cushion frame via a linkage mechanism. This shortens the stroke of the driving end, reduces the volume of the driving component, and facilitates the installation of the driving component inside the dental chair, thereby reducing the size of the dental chair and improving its aesthetics.

[0056] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A dental chair linkage system, characterized in that, The dental chair linkage system includes: The frame includes a fixed frame, a backrest frame, and a seat cushion frame, wherein the seat cushion frame is rotatably connected to the fixed frame, and the backrest frame is rotatably connected to the seat cushion frame; A drive assembly includes a linkage mechanism and a drive member; the linkage mechanism is mounted on the fixed frame and includes a first output end for driving the backrest frame, a second output end for driving the seat cushion frame, and an input end; the main body of the drive member is rotatably connected to the seat cushion frame, and the drive end of the drive member is rotatably connected to the input end to drive the linkage mechanism when the drive end slides relative to the main body of the drive member. The linkage mechanism includes: A rotating rod is rotatably connected to the fixed frame; the first output end and the input end are fixedly connected to the rotating rod. In the radial direction of the rotating rod, the distance between the first output end and the rotation center of the rotating rod is greater than the distance between the input end and the rotation center of the rotating rod, and / or in the radial direction of the rotating rod, the distance between the second output end and the rotation center of the rotating rod is less than the distance between the input end and the rotation center of the rotating rod; The linkage mechanism includes a drive rod, a rotating block, a first linkage unit, and a second linkage unit; The first output terminal and the second output terminal are disposed on the rotating block; one end of the first linkage unit is connected to the first output terminal and the other end is connected to the backrest frame; one end of the second linkage unit is connected to the second output terminal and the other end is connected to the seat cushion frame. The input end is disposed on the drive rod, the drive component is rotatably connected to the drive rod, the drive component and the drive rod are disposed inside the seat cushion frame, and the rotating block, the first connecting rod unit and the second connecting rod unit are disposed outside the seat cushion frame.

2. The dental chair linkage system according to claim 1, characterized in that, The frame also includes a leg support that is rotatably connected to the seat cushion frame. The leg support is located on the side of the seat cushion frame away from the backrest frame. The linkage mechanism also includes a third linkage unit located outside the seat cushion frame and a third output end for driving the leg support. The third output end is located on the rotating block. One end of the third linkage unit is connected to the third output end, and the other end is connected to the leg support.

3. The dental chair linkage system according to claim 2, characterized in that, The fixed frame has a protruding mounting portion, and the seat cushion frame is rotatably connected to the mounting portion; the rotating rod is installed on the side of the mounting portion facing the seat cushion frame, and the end of the rotating rod in the length direction passes through the mounting portion; the rotating block is fixedly connected to the rotating rod on the side of the mounting portion facing away from the seat cushion frame; the first connecting rod unit, the second connecting rod unit, and the third connecting rod unit are arranged on the side of the mounting portion facing away from the seat cushion frame.

4. The dental chair linkage system according to claim 2, characterized in that, Two rotating blocks are provided and are respectively installed at both ends of the rotating rod along its length; two sets of the first connecting rod unit, the second connecting rod unit and the third connecting rod unit are provided and are arranged opposite each other on both sides of the seat cushion frame.

5. The dental chair linkage system according to claim 1, characterized in that, The drive component is disposed inside the seat cushion frame and close to one side inner wall of the seat cushion frame to form an installation space inside the seat cushion frame. The installation space is disposed to the side of the drive component in the horizontal direction. A portion of the fixing bracket protrudes upward and extends into the top of the installation space to form a clearance position. The dental chair linkage system also includes: The lifting mechanism has a lifting end that can extend into the clearance position and be fixed to the top of the clearance position.

6. The dental chair linkage system according to claim 5, characterized in that, The clearance area includes a top plate and a side plate. The top plate is disposed inside the seat cushion frame. The side plate connects the top plate and the main body of the fixing frame in the vertical direction. The lifting end is installed on the lower surface of the top plate. The upper surface of the top plate is close to or flush with the upper surface of the seat cushion frame.

7. The dental chair linkage system according to claim 1, characterized in that, Also includes: The elastic component has two ends in the extension direction connected to the rotating block and the fixed frame, respectively, and the extension line of the elastic component in the extension direction does not intersect the rotation center line of the rotating rod.

8. A dental chair, characterized in that, The dental chair linkage system includes any one of claims 1 to 7.

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