Dental chair linkage system and dental chair

Abstract

The invention relates to the technical field of medical instruments, in particular to a dental chair linkage system and a dental chair, the dental chair linkage system comprises: a frame body comprising a fixing frame, a backrest frame and a cushion frame, the cushion frame is rotatably connected to the fixing frame, and the backrest frame is rotatably connected to the cushion frame; the driving assembly comprises a connecting rod mechanism and a driving piece; the connecting rod mechanism is installed on the fixing frame and comprises a first output end used for driving the backrest frame, a second output end used for driving the cushion frame and an input end, a main body of the driving piece is rotationally connected with the cushion frame, and the driving end of the driving piece is rotationally connected with the input end so that the connecting rod mechanism can be driven when the driving end slides relative to the main body of the driving piece. The driving piece indirectly drives the seat cushion frame to rotate relative to the fixing frame and drives the backrest frame to rotate relative to the seat cushion frame through the connecting rod mechanism, the stroke of the driving end is shortened, the size of the driving piece is reduced, installation and layout of the driving piece in the dental chair are facilitated, and the size of the dental chair is reduced.

Description

Technical Field

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

[0002] A dental chair, that is, a dental comprehensive treatment chair, is used for treating dental diseases. When a common dental chair is in use, it is necessary to control the angles of the backrest and the seat cushion to adapt to different treatment workstations. See Chinese Patent CN202311819573.2 which discloses a three-fold chair, one end of whose drive mechanism is installed on the seat cushion and the other end is installed on the backrest. The drive mechanism directly drives the movement of the backrest relative to the seat cushion. This structure results in an excessive stroke of the drive mechanism, so the volume of the drive mechanism increases, requiring a larger installation space, which is not conducive to being installed inside the dental chair, resulting in a large volume of the dental chair. Summary of the Invention

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

[0004] The first aspect of the present invention provides a dental chair linkage system, wherein the dental chair linkage system includes: A frame body, including 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; A drive assembly, including a link mechanism and a drive member; the link mechanism is installed 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 link mechanism when the drive end slides relative to the main body of the drive member.

[0005] Preferably, the link mechanism includes: A rotating rod, 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 link mechanism includes a drive rod, a rotating block, a first link unit and a second link unit; The first output end and the second output end are provided on the rotating block; one end of the first connecting rod unit is connected to the first output end, and the other end is connected to the backrest frame; one end of the second connecting rod unit is connected to the second output end, and the other end is connected to the seat cushion frame; The input end is arranged on the driving rod, the driving member is rotatably connected to the driving rod, the driving member and the driving rod are arranged inside the seat cushion frame, and the rotating block, the first connecting rod unit and the second connecting rod unit are arranged outside the seat cushion frame.

[0007] Preferably, the frame body also includes a leg support rotatably connected to the seat cushion frame, and the leg support is arranged on a side of the seat cushion frame away from the backrest frame. The connecting rod mechanism also includes a third connecting rod unit arranged outside the seat cushion frame and a third output end for driving the leg support, and the third output end is arranged on the rotating block. One end of the third connecting rod unit is connected to the third output end, and the other end is connected to the leg support.

[0008] Preferably, a protruding mounting portion is formed on the fixing frame, and the seat cushion frame is rotatably connected to the mounting portion; the rotating rod is mounted on a side of the mounting portion facing the seat cushion frame, and an end portion of the rotating rod in the length direction passes through the mounting portion, and the rotating block is fixedly connected to the rotating rod on a 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 a side of the mounting portion facing away from the seat cushion frame.

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

[0010] Preferably, the avoidance position includes a top plate and a side plate, the top plate is arranged inside the cushion frame, the side plates connect 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, and the upper surface of the top plate is close to or flush with the upper surface of the cushion frame.

[0011] Preferably, it further includes: An elastic member, the two ends in its telescopic direction are respectively connected to the rotating block and the fixed frame, and the extension line of the elastic member in the telescopic direction does not intersect with the rotation center line of the rotating rod.

[0012] The 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: In the dental chair linkage system of the present invention, the frame body 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 driving assembly includes a link mechanism and a driving member; the link mechanism is installed 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 driving member is rotatably connected to the seat cushion frame, and the driving end of the driving member is rotatably connected to the input end to drive the link mechanism when the driving end slides relative to the main body of the driving member, so as to realize the unfolding or folding of the dental chair. The driving 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 link mechanism. Compared with the traditional direct drive structure, the stroke of the driving end is shortened, the volume of the driving member is reduced, which is helpful for the installation layout of the driving member in the dental chair, and further realizes the reduction of the volume of the dental chair and the improvement of the aesthetics of the dental chair.

[0014] In order 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, is described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 drawings in the following description 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.

[0016] Figure 1 It is a schematic structural diagram of the dental chair linkage system provided by the embodiment of the present invention in the low chair position folding state; Figure 2 It is a schematic top view structural diagram of the dental chair linkage system provided by the embodiment of the present invention in the low chair position folding state; Figure 3 It is a schematic structural diagram of the dental chair linkage system provided by the embodiment of the present invention in the high chair position folding state; Figure 4A structural cross-sectional view of the dental chair linkage system provided by an embodiment of the present invention in the folded state at the low chair position; Figure 5 A schematic structural diagram of the dental chair linkage system provided by an embodiment of the present invention in the semi-expanded state at the low chair position; Figure 6 A schematic structural diagram of the dental chair linkage system provided by an embodiment of the present invention in the fully-expanded state at the low chair position; Figure 7 A structural cross-sectional view of the dental chair linkage system provided by an embodiment of the present invention in the fully-expanded state at the low chair position.

[0017] Icon: 11 - fixing frame; 111 - avoidance position; 1111 - top plate; 1112 - side plate; 112 - installation part; 113 - extension part; 12 - backrest frame; 13 - seat cushion frame; 131 - guiding groove; 132 - installation space; 133 - strengthening member; 14 - leg bracket; 20 - linkage mechanism; 200 - input end; 201 - first output end; 202 - second output end; 203 - third output end; 21 - rotating rod; 22 - driving rod; 23 - rotating block; 211 - first link unit; 212 - second link unit; 213 - third link unit; 30 - driving member; 31 - driving end; 40 - lifting mechanism; 41 - lifting end; 50 - elastic member. Detailed implementation manners

[0018] The following detailed implementation manners are provided to help readers obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be obvious. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be obvious after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, for the sake of clarity and conciseness, descriptions of features known in the art may be omitted.

[0019] The features described herein can 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 obvious after understanding the disclosure of the present application.

[0020] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on," "connected to," "coupled to," "above," or "covering" another element, it can be directly "on," "connected to," "coupled to," "above," 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," "directly connected to," "directly coupled to," "directly above," or "directly covering" another element, there can be no other elements intervening therebetween.

[0021] 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.

[0022] Although terms such as "first," "second," and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or section from another. Thus, a first component, element, region, layer, or section described in an example herein could also be termed a second component, element, region, layer, or section without departing from the teachings of the example.

[0023] 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 encompass 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.

[0024] The terms used herein are for describing various examples only and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. The terms "comprise", "include" and "have" enumerate the stated features, quantities, operations, components, elements and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0025] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0026] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

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

[0028] Hereinafter, the specific structures of the above components of the dental chair linkage system according to the present embodiment will be described.

[0029] In the present embodiment, as Figures 1 to 6 shown, the frame body 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 in the horizontal direction, and the seat cushion frame 13 is disposed above the fixed frame 11. Thus, the attitude angle of the patient's hip position can be adjusted by driving the seat cushion frame 13 to rotate relative to the fixed frame 11; 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 is switched between the folded and unfolded states; as Figures 1 to 4 shown, the frame body is in the folded state, at this time the backrest frame 12 and the seat cushion frame 13 are disposed at approximately 90°, as Figure 5 shown, the frame body is in the semi-unfolded state, at this time the included angle between the backrest frame 12 and the seat cushion frame 13 is increased relative to the Figures 1 to 4 folded state, as Figure 6 shown, the frame body is in the fully unfolded state, at this time the included angle between the backrest frame 12 and the seat cushion frame 13 is further increased relative to the Figure 5 semi-unfolded state and is unfolded to the limit position.

[0030] In the present 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 member 30. The drive member 30 can be an electric push rod or a pneumatic push rod, etc., which can realize a linear telescopic movement mechanism.

[0031] The linkage mechanism 20 is installed 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 drive member 30 is rotatably connected to the seat cushion frame 13, and the drive end 31 of the drive member 30 is rotatably connected to the input end 200. When the drive end 31 slides relative to the main body of the drive member 30, the linkage mechanism 20 is driven to realize the angle adjustment of the dental chair between the unfolded and folded states. The drive 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 drive end 31 is shortened, the volume of the drive member 30 is reduced, which is helpful for the installation layout of the drive member 30 in the dental chair, and then the volume of the dental chair is reduced, and the aesthetics of the dental chair is improved.

[0032] Further, in this embodiment, as Figures 1 to 5 shown, the linkage mechanism 20 includes a rotating rod 21. The rotating rod 21 is formed into a rod-shaped structure, such as a cylindrical rod-shaped 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 realize 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 member; 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. In this way, when the backrest frame 12 needs to rotate downward (that is, from the Figure 1 state to rotate to Figure 5 or Figure 6 state), the drive member 30 drives the input end 200 to rotate, thereby transmitting the power to the rotating rod 21, realizing the control of the rotation of the first output end 201, and finally realizing the rotation of the backrest frame 12 relative to the seat cushion frame 13.

[0033] Preferably, 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. In this way, when the driving member 30 drives the backrest frame 12 to rotate relative to the 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 rotation center of the rotating rod 21, the actual displacement generated by the driving end 31 is smaller than the relative displacement generated by the backrest frame 12, so that the required stroke of the driving member 30 is reduced. Correspondingly, the space reserved for the extension and retraction of the driving member 30 in the dental chair can be relatively reduced, which facilitates the layout of the driving member 30 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, of the distance between the input end 200 and the rotation center of the rotating rod 21, thereby ensuring that the load-bearing capacity and stroke of the driving member 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, if Figures 1 to 6 As shown, the seat cushion frame 13 is provided with a guide groove 131, which is provided on the side walls on both sides of the seat cushion frame 13; the guide groove 131 is formed into an arc shape, and the backrest frame 12 can rotate relative to the seat cushion frame 13 while also being able to move along the extension track of the guide groove 131, so that the backrest frame 12 has both rotation and movement components.

[0036] The specific values are listed below to more intuitively illustrate the effect of shortening the stroke of the driving member 30 brought about by the structure of the present application. Figure 4 As shown, the driving member 30 is connected to the seat frame 13 at point A, and the driving member 30 is connected to the rotation of the rotating rod 21 at point B. The rotation of the backrest member in the arc-shaped guide groove 131 is connected to point C. The connecting line AB is the actual length of the driving member 30 (i.e., L real), and the connecting line AC is the length when the driving mechanism directly drives the backrest frame 12 (i.e., L imaginary). Figure 4 Rotate to Figure 7 The angle change value of the backrest frame 12 in the process is β, and the actual measurement is Figure 4 In this state, L 实1 =360mm, L 虚1 =475mm; Figure 7 In this state, L 实2 =275mm, L 虚2 =288mm, so in this application the frame is composed of Figure 4 Rotate to Figure 7 In the state, the stroke of the driving member 30 is L 实1 -L 实2= 360 mm - 275 mm = 85 mm, while the stroke required for the traditional drive mechanism to directly drive the backrest frame 12 when rotating the same angle is L 虚1 - L 虚2 = 475 mm - 288 mm = 187 mm. It can be seen that to achieve the same rotation angle β, the indirect drive structure of the present application shortens the drive stroke by 102 mm compared with the traditional direct drive structure.

[0037] Preferably, in order to ensure the comfort of the patient, the inclination range of the seat cushion frame 13 is required not to be too large. For example 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. Such a setting enables the position of the second output end 202 to meet the small rotation requirement of the seat cushion frame 13. It should be noted that at this time, 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 shown, the link mechanism 20 includes a driving rod 22, a rotating block 23, a first link unit 211 and a second link unit 212; the driving rod 22 can be formed into a rod-shaped structure, and the input end 200 is arranged on the driving rod 22. Specifically, the input end 200 can be arranged at one end of the driving rod 22 far from the rotating rod 21 in the length direction. The driving member 30 is rotatably connected to the driving rod 22. Specifically, the driving end 31 is rotatably connected to the driving rod 22. The first output end 201 and the second output end 202 are arranged on the rotating block 23. The rotating block 23 can be formed into a plate-shaped structure or a block-shaped structure. The first output end 201 and the second output end 202 can be formed as hinge holes opened on the rotating block 23; one end of the first link unit 211 is connected to the first output end 201, the other end of the first link unit 211 is connected to the backrest frame 12, one end of the second link unit 212 is connected to the second output end 202, and the other end of the second link unit 212 is connected to the seat cushion frame 13; both ends of the first link unit 211 and the second link unit 212 are rotatably connected. In this way, 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, and the rotating block 23 rotates to drive the first link unit 211 and the second link unit 212 to rotate, thereby realizing the rotational drive of the seat cushion frame 13 and the backrest frame 12.

[0039] More specifically, the driving member 30 and the driving rod 22 are arranged inside the seat cushion frame 13, and the rotating block 23, the first link unit 211 and the second link unit 212 are arranged outside the seat cushion frame 13. In this way, the volume of the seat cushion frame 13 can be reduced, and the strength requirement can also be lowered. If the link mechanism 20 is all located on the same side, the rotating connection parts such as the first link unit 211 and the second link unit 212 with the seat cushion frame 13 and the backrest frame 12 respectively will form a cantilever beam structure, 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 the end in its length direction extends out of the seat cushion frame 13 and is connected to the rotating block 23.

[0040] In addition, the frame body further includes a leg bracket 14, and the leg bracket 14 is used to support the patient's legs and provide support for the patient's legs. In an optional embodiment, the seat cushion frame 13 and the leg bracket 14 are integrally formed, so that the angle between the seat cushion frame 13 and the leg bracket 14 is not adjustable.

[0041] In a preferred embodiment, as Figures 1 to 6 shown, the leg bracket 14 is arranged 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. In this way, the angle between the leg bracket 14 and the seat cushion frame 13 can be adjusted to make the patient more comfortable when lying down and facilitate the patient to get on and off the dental chair. Specifically, the link mechanism 20 further includes a third link unit 213 arranged outside the seat cushion frame 13 and a third output end 203 for driving the leg bracket 14. The third output end 203 is arranged on the rotating block 23. The third transmission end can be a hinge hole structure opened on the rotating block 23. One end of the third link unit 213 is connected to the third output end 203, and the other end of the third link unit 213 is connected to the leg bracket 14. In this way, 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 rotating block 23 rotates and then drives the third link unit 213 to rotate, thereby realizing the rotational drive of the leg bracket 14.

[0042] In this embodiment, the structures 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 formed by a plurality of rods connected by rotation, 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 seat cushion frame 13, the backrest frame 12 and the leg bracket 14 when the rotating block 23 rotates to realize the unfolding or folding of the dental chair.

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

[0044] In this embodiment, as Figures 2 to 4 and Figure 6As shown, the driving member 30 is arranged inside the frame structure of the cushion frame 13 and is arranged close to the inner wall of one side of the cushion frame 13, that is, the driving member 30 is installed along the side of the cushion frame 13 to form an installation space 132 inside the cushion frame 13, and the installation space 132 is arranged on the side of the driving member 30 in the horizontal direction, thereby reserving a position in the middle of the interior of the cushion frame 13; part of the fixing frame 11 protrudes upward and extends into the top of the installation space 132 to form an avoidance position 111 on the fixing frame 11, and the avoidance position 111 can be a hole opened on the fixing frame 11, and surrounded by multiple plate-like structures above the hole position; the dental chair linkage system also includes a lifting mechanism 40 for driving the cushion frame 13 to move up and down to adjust the height of the cushion frame 13 from the ground, and the lifting mechanism 40 can It can be a telescopic motor, a telescopic cylinder or a motor screw, etc., as long as it can drive the seat cushion 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 avoidance position 111 and is fixed to the top of the avoidance position 111. Due to the installation structure of the driving member 30 and the connecting rod mechanism 20, enough space is reserved for the middle of the inner part of the seat cushion frame 13, so that the lifting end 41 extends into the seat cushion frame 13 together with the avoidance position 111, and the top of the avoidance position 111 can be close to the top of the seat cushion frame 13. Since the extension distance of the avoidance position 111 into the seat cushion frame 13 is long enough, the distance between the upper surface of the seat cushion frame 13 and the ground is finally made closer, so that the overall height of the dental chair is lower when it is in the lowest position, which can facilitate the elderly, children and other groups who need special care to get on and off the dental chair.

[0045] It should be noted that in Figure 2 From the perspective shown, it can be seen that the driving member 30 and the avoidance position 111 are staggered and arranged, so that the avoidance position 111 can be arranged without considering the installation position of the driving member 30 .

[0046] Specifically, in this embodiment, Figure 4 As shown, the avoidance position 111 includes a top plate 1111 and a side plate 1112. The top plate 1111 is arranged inside the cushion frame 13, and the side plate 1112 connects the top plate 1111 and the main body of the fixed frame 11 in the vertical direction. The lifting end 41 is installed on the lower surface of the top plate 1111, and the upper surface of the top plate 1111 is arranged close to the upper surface of the cushion frame 13 (preferably, the upper surface of the top plate 1111 at this time is below the upper surface of the cushion frame 13 to avoid interference between the avoidance position 111 and the components in the dental chair), or the upper surface of the top plate 1111 is arranged flush with the upper surface of the cushion frame 13, so that the lifting mechanism 40 directly drives the top plate 1111 arranged inside the cushion frame 13 to perform lifting and lowering movements, so that the distance between the upper surface of the cushion 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.

[0047] Optionally, the minimum distance in the vertical direction between the upper surface of the seat cushion frame 13 and the upper surface of the avoidance position 111 (i.e., the upper surface of the top plate 1111) is 0, so that the overall height of the dental chair is minimized when the dental chair is in 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 enhance the structural strength of the seat cushion frame 13. The thickness of the reinforcing member 133 is H, with the unit of mm. H can be 10 mm. The minimum distance in the vertical direction between the upper surface of the avoidance position 111 and the upper surface of the seat cushion frame 13 is H + 5 mm to avoid interference. Such a setting makes the lowest height of the dental chair seat position = the height of the dental chair base + the lowest height of the lifting mechanism 40 + the thickness of the seat cushion cotton placed on the seat cushion frame 13 + H + 5 mm, realizing the convenience for groups in need of special care such as the elderly and children to get on and off the dental chair.

[0049] It should be noted that in the embodiment without the reinforcing member 133, the minimum distance in the vertical direction between the upper surface of the avoidance position 111 and the upper surface of the seat cushion frame 13 can be 5 mm, or can be set to other parameters according to requirements, 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] In addition, in this embodiment, as Figure 6 shown, the dental chair linkage system further includes an elastic member 50. The two ends of the elastic member 50 in its telescopic direction are respectively connected to the rotating block 23 and the fixed frame 11, and the extension line of the elastic member 50 in the telescopic direction does not intersect the rotation center line of the rotating rod 21, so as to ensure that the moment of the elastic member 50 relative to the rotation center of the rotating rod 21 is always non-zero.

[0051] Specifically, as Figure 6 shown, the bottom of the fixed frame 11 forms an outward extension 113 extending downward. The outward extension 113 is formed into a plate-like structure, and the elastic member 50 is installed on the outward extension 113.

[0052] In this embodiment, the elastic member 50 can be a gas spring. When installed, the elastic member 50 is always in a compressed state. The compressed state of the elastic member 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 folded state tending to Figure 1 shown.

[0053] In addition, due to the fitting clearances existing in the link mechanism 20 and the dead band of the driving member 30 which are also likely to cause the problem of the frame shaking, the acting force (tensile force) applied by the elastic member 50 to the link mechanism 20, through the elastic action of the elastic member 50, fills the clearances and offsets the dead band, so that the movement of the link mechanism 20 is more stable and accurate, effectively solving the problem of shaking and improving the operation stability and reliability of the whole 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 driving assembly includes a link mechanism and a driving member; the link mechanism is installed 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 driving member is rotatably connected to the seat cushion frame, and the driving end of the driving member is rotatably connected to the input end to drive the link mechanism when the driving end slides relative to the main body of the driving member, so as to realize the unfolding or folding of the dental chair. The driving 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 link mechanism. Compared with the traditional direct drive structure, the stroke of the driving end is shortened and the volume of the driving member is reduced, which helps the installation layout of the driving member in the dental chair.

[0055] According to a dental chair provided by the present invention, which includes the above dental chair linkage system, in the dental chair linkage system, the driving member indirectly realizes the rotation drive of the seat cushion frame relative to the fixed frame and the rotation drive of the backrest frame relative to the seat cushion frame through the link mechanism, shortening the stroke of the driving end, reducing the volume of the driving member, facilitating the installation of the driving member in the dental chair, and further realizing the reduction of the volume of the dental chair and improving the aesthetics of the dental chair.

[0056] Finally, it should be noted that the above embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application 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 by the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on 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 subject to the protection scope of the claims.

Claims

1. A dental chair linkage system, characterized in that, The dental chair linkage system includes: A frame body, including 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; A driving assembly, including a linkage mechanism and a driving member; the linkage mechanism is installed 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 driving member is rotatably connected to the seat cushion frame, and the driving end of the driving member is rotatably connected to the input end to drive the linkage mechanism when the driving end slides relative to the main body of the driving member.

2. The dental chair linkage system according to claim 1, wherein The linkage mechanism includes: A rotating rod, 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.

3. The dental chair linkage system according to claim 2, wherein, The linkage mechanism includes a driving rod, a rotating block, a first link unit, and a second link unit; The first output end and the second output end are arranged on the rotating block; one end of the first link unit is connected to the first output end, and the other end is connected to the backrest frame; one end of the second link unit is connected to the second output end, and the other end is connected to the seat cushion frame; The input end is arranged on the driving rod, the driving member is rotatably connected to the driving rod, the driving member and the driving rod are arranged inside the seat cushion frame, and the rotating block, the first link unit, and the second link unit are arranged outside the seat cushion frame.

4. The dental chair linkage system according to claim 3, wherein, The frame body further includes a leg support frame rotatably connected to the seat cushion frame. The leg support frame is arranged on the side of the seat cushion frame away from the backrest frame. The linkage mechanism further includes a third link unit arranged outside the seat cushion frame and a third output end for driving the leg support frame. The third output end is arranged on the rotating block, and one end of the third link unit is connected to the third output end, and the other end is connected to the leg support frame.

5. The dental chair linkage system according to claim 4, wherein, A protruding mounting portion is formed on the fixed frame, 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 link unit, the second link unit, and the third link unit are arranged on the side of the mounting portion facing away from the seat cushion frame.

6. The dental chair linkage system according to claim 4, wherein There are two rotating blocks, which are respectively installed at both ends of the rotating rod in the length direction; the first link unit, the second link unit, and the third link unit are all provided in two groups, and are arranged oppositely on both sides of the seat cushion frame.

7. The dental chair linkage system according to claim 1, wherein, The driving member is arranged inside the seat cushion frame and is close to one inner wall of the seat cushion frame so as to form an installation space inside the seat cushion frame, and the installation space is arranged on the side of the driving member in the horizontal direction; part of the fixing frame protrudes upward and extends into the top of the installation space to form an avoidance position; The dental chair linkage system further includes: A lifting mechanism having a lifting end that can extend into the avoidance position and be fixed to the top of the avoidance position.

8. The dental chair linkage system according to claim 7, wherein, The avoidance position includes a top plate and a side plate. The top plate is arranged 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, and the upper surface of the top plate is close to or flush with the upper surface of the seat cushion frame.

9. The dental chair linkage system according to claim 3, characterized in that, It further includes: An elastic member, the two ends of which in the telescopic direction are respectively connected to the rotating block and the fixing frame, and the extension line of the elastic member in the telescopic direction does not intersect the rotation center line of the rotating rod.

10. A dental chair, characterized in that, It includes the dental chair linkage system according to any one of claims 1 to 9.

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