dental chairs

Abstract

The present application provides a dental chair comprising: a support frame; a first bracket movably mounted on one end of the support frame; a second bracket, one end of which is hinged to the other end of the support frame, and the second bracket and the first bracket are respectively located on opposite sides of the support frame; a drive assembly for driving the first bracket to move, the drive assembly being mounted on the support frame, the power output end of the drive assembly being connected to the first bracket; and a connecting rod assembly for driving the second bracket to rotate upward when the free end of the first bracket swings downward, the connecting rod assembly transmission-connecting the first bracket and the second bracket, the connecting rod assembly being mounted on the support frame. The dental chair provided by the present application provides strong and comfortable support for the user's legs by linking the first bracket and the second bracket through the connecting rod assembly, thereby improving the user's comfort.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and more specifically, relates to a dental chair. Background Art

[0002] Chairs are inextricably linked to our daily lives, from daily life and travel to medical appointments. Chairs are known by different names depending on their use. For example, in the medical field, dental chairs are used to support dental patients during treatment, allowing them to sit, recline, or lie down in a variety of positions, facilitating diagnosis and treatment.

[0003] Existing dental chairs usually include a drive device, a backrest, a seat cushion and a footrest; the backrest and the seat cushion are connected by a connecting rod, wherein the drive device drives the backrest to rotate, thereby adjusting the angle between the backrest and the seat cushion, which is convenient for doctors to examine and treat and suitable for patients to lie down; however, the footrest and the seat cushion of the dental chair are fixedly connected, and the angle between the two cannot be adjusted; when using the dental chair, the patient's calf cannot be bent at will, and it is difficult to maintain a relatively comfortable posture; especially for some special groups (such as people with leg disabilities or difficulty lifting their legs), the calf bending angle cannot match the fixed angle between the footrest and the seat cushion. When the patient lies on the backrest with his back, his legs are suspended in the air, affecting the patient's experience. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a dental chair to solve the technical problem in the prior art that the angle between the seat cushion and the footrest in the dental chair cannot be adjusted, thereby affecting the patient's comfort experience.

[0005] To achieve the above objectives, the technical solution adopted in this application is to provide a dental chair, comprising:

[0006] Support frame;

[0007] a first bracket movably mounted on one end of the support frame;

[0008] a second bracket, one end of which is hinged to the other end of the support frame, and the second bracket and the first bracket are respectively located on opposite sides of the support frame;

[0009] a driving assembly, configured to drive the first bracket to move, the driving assembly being mounted on the support frame, the power output end of the driving assembly being connected to the first bracket; and

[0010] The connecting rod assembly is used to drive the second bracket to rotate upward when the free end of the first bracket swings downward. The connecting rod assembly is transmission-connected to the first bracket and the second bracket, and the connecting rod assembly is movably installed on the support frame.

[0011] By adopting the above technical solution, the driving assembly drives the first bracket to move, and the second bracket connected to the connecting rod assembly will rotate under its drive. Specifically, the free end of the first bracket is located on the upper side of the support frame, and the free end of the second bracket is located on the lower side of the support frame; when the free end of the first bracket swings downward, the free end of the second bracket rotates upward, playing a role of linked swinging; thereby achieving the purpose of adjusting the angle between the second bracket and the support frame, as well as the position and angle between the first bracket and the support frame, to meet the patient's requirements and satisfy postures such as leaning, sitting supine, and lying down; improving the patient's comfort when lying down, the second bracket can provide the patient's legs with strong and comfortable support, thereby solving the problem that some special groups cannot bend their calves by themselves.

[0012] In one embodiment, the connecting rod assembly includes a connecting shaft connected to the first bracket, a first connecting arm connected to the connecting shaft at one end, a first support shaft supporting the middle part of the first connecting arm, a second connecting arm hingedly connected to the other end of the first connecting arm at one end, and a second support shaft supporting the middle part of the second connecting arm, the other end of the second connecting arm is hingedly connected to the second bracket, and the first support shaft and the second support shaft are arranged on the support frame.

[0013] By adopting the above technical solution, the connecting rod assembly connects the first bracket, the support frame and the second bracket, and transmission is achieved under the drive of the driving assembly. The structure is simple and the spatial layout is more compact.

[0014] Optionally, a first hole is provided on the first connecting arm, the first hole is arranged along the length direction of the first connecting arm, the first support shaft is inserted into the first hole, and the first connecting arm is slidably supported on the first support shaft.

[0015] By adopting the above technical solution, the first connecting arm can be stably supported and can slide on the first supporting shaft.

[0016] In one embodiment, a second hole is formed on the second connecting arm, the second supporting shaft is inserted into the second hole, and the second connecting arm is slidably supported on the second supporting shaft.

[0017] By adopting the above technical solution, the second connecting arm can be stably supported.

[0018] In one embodiment, the second hole includes a first sliding area and a second sliding area connected to the first sliding area, the first sliding area is arranged to be inclined upward from the end of the second connecting arm close to the first connecting arm to the middle of the second connecting arm, and the second sliding area is arranged to be inclined downward from the middle of the second connecting arm to the end of the second connecting arm close to the second bracket.

[0019] By adopting the above technical solution, the angle between the second bracket and the support frame is expanded.

[0020] In one embodiment, a third hole is formed on the seat frame, and the connecting shaft is slidably inserted into the third hole.

[0021] By adopting the above technical solution, the connection between the first bracket and the second bracket is achieved through the connecting rod assembly.

[0022] Optionally, the third hole is an arc-shaped hole.

[0023] By adopting the above technical solution, the first bracket moves along the third hole, so that the angle between the first bracket and the seat frame is wider, the applicability is improved, and it conforms to the ergonomic principles of the human body when lying down or sitting up.

[0024] In one embodiment, a first pin is installed on a side of the first support shaft close to the first connecting arm, a first roller is sleeved on the first pin, and the first roller supports the first connecting arm.

[0025] By adopting the above technical solution, a rolling connection is achieved through the first roller and the first connecting arm, thereby reducing the friction loss between the first support shaft and the first connecting arm.

[0026] In another embodiment, a second pin is installed on a side of the second support shaft close to the second connecting arm, a second roller is sleeved on the second pin, and the second roller supports the second connecting arm.

[0027] By adopting the above technical solution, a rolling connection is achieved through the second roller and the second connecting arm, thereby reducing the friction loss between the second support shaft and the second connecting arm.

[0028] In another embodiment, a first pin is installed on the side of the first support shaft close to the first connecting arm, a first roller is sleeved on the first pin, and the first roller supports the first connecting arm; a second pin is installed on the side of the second support shaft close to the second connecting arm, a second roller is sleeved on the second pin, and the second roller supports the second connecting arm.

[0029] By adopting the above technical solution, the friction loss between the connecting rod assembly and the support frame is reduced.

[0030] In one embodiment, the second bracket includes a support plate hingedly connected to the support frame and a telescopic plate slidably connected to the support plate, and the telescopic plate is hingedly connected to the second connecting arm.

[0031] By adopting the above technical solution, when the second bracket rotates, the telescopic plate extends to support the user's legs, which is convenient for people with longer legs to use, gives their legs a sense of support, and improves the user experience.

[0032] In one embodiment, a third hole is formed on the support frame, and the connecting shaft is slidably inserted into the third hole.

[0033] By adopting the above technical solution, the presence of the third hole facilitates the connection between the first bracket and the connecting rod assembly, and the spatial layout is more compact.

[0034] In one embodiment, a third support shaft connected to the first bracket is slidably installed in the third hole, and the third support shaft and the connecting shaft are arranged side by side and at intervals.

[0035] By adopting the above technical solution, the connection between the first bracket and the support frame is achieved through the third support shaft, which can improve the stability of the first bracket.

[0036] Optionally, a third roller is mounted on the third support shaft, and the third roller is located in the third hole.

[0037] By adopting the above technical solution, the friction loss between the third support shaft and the seat frame is reduced.

[0038] Optionally, a fourth roller is mounted on the connecting shaft, and the fourth roller is located in the third hole.

[0039] By adopting the above technical solution, the friction loss between the fourth support shaft and the support frame is reduced.

[0040] In one embodiment, the support frame comprises:

[0041] a first support seat;

[0042] a second support base, one end of the second support base being hingedly connected to the first support base;

[0043] a first connecting member, one end of which is connected to the first bracket, and the other end of which is hingedly connected to the first support seat; and

[0044] The second connecting member is used to drive the end of the second support seat close to the second bracket to rotate upward when the free end of the first bracket swings downward.

[0045] By adopting the above technical solution, the presence of the first connecting member improves the connection stability between the first support seat and the second support seat. The cooperation between the first connecting member and the second connecting member realizes the linkage cooperation between the first bracket and the second support seat, and finally realizes the linkage cooperation between the first bracket, the second bracket and the second support seat; the angle between the first bracket, the second bracket and the second support seat is more in line with the user's requirements, and the comfort of use is further improved.

[0046] In one embodiment, the first connecting member includes a first arm hingedly connected to the first bracket at one end, a second arm hingedly connected to the other end of the first arm and a first hinge shaft connected to the other end of the second arm at one end, and the other end of the first hinge shaft is hingedly connected to the first support seat; the second connecting member includes a connecting plate hingedly connected to the middle of the second support seat at one end and a second hinge shaft at one end to the other end of the connecting plate, and the other end of the second hinge shaft is hingedly connected to the end of the second arm away from the first arm; the rotation center of the first hinge shaft does not coincide with the rotation center of the second hinge shaft.

[0047] By adopting the above technical solution, the setting of the first arm and the second arm makes the cooperation between the first bracket and the first support seat more flexible, realizing the linkage cooperation between the first bracket and the second support seat, which can meet the user's requirements for different postures and angles, and improve applicability and comfort of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0049] Figure 1 Schematic diagram of the structure of the dental chair in the embodiment of the present application Figure 1 ;

[0050] Figure 2 This is a schematic diagram of the structure of the dental chair provided in the embodiment of the present application when it is not unfolded. Figure 1 ;

[0051] Figure 3 for Figure 2 A front view of the dental chair shown in ;

[0052] Figure 4 for Figure 1 A front view of the dental chair shown in ;

[0053] Figure 5 This is a schematic diagram of the structure of the dental chair provided in an embodiment of the present application when it is fully unfolded;

[0054] Figure 6 Schematic diagram of the connection principle between the second connecting arm, support frame and second bracket of the dental chair provided in this application Figure 1 ;

[0055] Figure 7 Schematic diagram of the connection principle between the second connecting arm, the support frame and the second bracket Figure 2 ;

[0056] Figure 8 for Figure 1 A partial exploded schematic diagram of the second support seat and connecting rod assembly;

[0057] Figure 9 for Figure 8 Enlarged view of point D in the middle;

[0058] Figure 10 for Figure 2 The structure of the dental chair when it is not unfolded is shown in Figure 2 ;

[0059] Figure 11 for Figure 10 Schematic diagram of some structures in ;

[0060] Figure 12 Schematic diagram of the connection relationship between the first support base, the second support base and the first bracket;

[0061] Figure 13 for Figure 12 Schematic diagram of some structures in ;

[0062] Figure 14 for Figure 5 A top view of

[0063] Figure 15 for Figure 9 Schematic diagram of the explosion structure of the second bracket Figure 1 ;

[0064] Figure 16 for Figure 9 Schematic diagram of the explosion structure of the second bracket Figure 2 .

[0065] Among them, the reference numerals in the figures are:

[0066] 10. Support frame; 11. First support base; 12. Second support base; 120. Third hole; 121. Cable installation position; 13. First connecting member; 131. First support arm; 132. Second support arm; 133. First hinge axis; 14. Second connecting member; 141. Connecting plate; 142. Second hinge axis;

[0067] 20. First bracket; 21. Third support shaft; 211. Third roller; 212. First stopper; 2121. First stopper; 2122. Nut;

[0068] 30. Second bracket; 31. Support plate; 32. Telescopic plate; 33. Slide rail; 34. Slider;

[0069] 40. Drive assembly;

[0070] 50. Connecting rod assembly; 51. Connecting shaft; 511. Fourth roller; 512. Second limiting member; 5121. Second limiting block; 5122. Connecting pin; 52. First connecting arm; 520. First hole; 53. First support shaft; 531. First pin; 532. First roller; 54. Second connecting arm; 540. Second hole; 541. First sliding area; 542. Second sliding area; 55. Second support shaft; 551. Second pin; 552. Second roller. DETAILED DESCRIPTION

[0071] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0072] It should be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0074] It should be noted that the X direction in the figure refers to the length direction of the dental chair on the horizontal plane, which is only for the convenience of description and understanding and should not be regarded as limiting the scope of protection of this application.

[0075] See also Figure 1 The dental chair provided in an embodiment of the present application is now described. The dental chair comprises a support frame 10, a first bracket 20, a second bracket 30, a drive assembly 40, and a connecting rod assembly 50. The first bracket 20 is movably mounted on one end of the support frame 10 and is used to support the user's back. One end of the second bracket 30 is hinged to the other end of the support frame 10 and is used to support the user's calf. The first bracket 20 and the second bracket 30 are respectively located on opposite sides of the support frame 10. The drive assembly 40 is mounted on the support frame 10, and the power output end of the drive assembly 40 is connected to the first bracket 20. The drive assembly 40 is used to drive the first bracket 20 to move. The connecting rod assembly 50 is mounted on the support frame 10 and is transmission-connected to the first bracket 20 and the second bracket 30. The connecting rod assembly 50 is used to drive the second bracket 30 to rotate upward when the free end of the first bracket 20 swings downward.

[0076] See also Figures 3 to 5 When the driving assembly 40 drives the lower end of the first bracket 20 to swing upward, the free end of the first bracket 20 swings downward, and the first bracket 20 drives the end of the connecting rod assembly 50 that cooperates with the support frame 10 to move toward the side of the second bracket 30, thereby driving the free end of the second bracket 30 to rotate upward, so that the first bracket 20, the support frame 10 and the second bracket 30 are stretched out to adapt to the user lying down, so that the angles between the first bracket 20 and the support frame 10, and the support frame 10 and the second bracket 30 can be ergonomic, thereby improving the patient's use experience; the second bracket 30 rotates upward, firstly avoiding the disadvantage of the existing technology that the angle between the center footrest and the seat cushion cannot be adjusted, thereby solving the problem that some special groups (people with leg and foot disabilities) cannot bend their calves by themselves and feel uncomfortable. Secondly, when adjusting the rotation angle of the first bracket 20, the angle of the second bracket 30 can be automatically adjusted synchronously, making the overall adjustment more convenient and simple, and the back and calves can be supported at the same time when the user lies down, making the user experience more comfortable.

[0077] Optionally, one end of the first bracket 20 is slidably connected to one end of the support frame 10, and the free end of the first bracket 20 extends upward from the support frame 10. One end of the second bracket 30 is hinged to the other end of the support frame 10, and the free end of the second bracket 30 extends downward from the support frame 10. The horizontal distance between the first bracket 20 and the second bracket 30 can be adjusted to suit the user's posture when sitting or lying down, so as to better provide support and improve user comfort.

[0078] In one embodiment of this application, please refer to Figures 2 to 5 The connecting rod assembly 50 includes a connecting shaft 51, a first connecting arm 52, a first support shaft 53, a second connecting arm 54 and a second support shaft 55; the connecting shaft 51 is connected to the first bracket 20, one end of the first connecting arm 52 is connected to the connecting shaft 51, the other end of the first connecting arm 52 is hingedly connected to one end of the second connecting arm 54, and the other end of the second connecting arm 54 is hingedly connected to the second bracket 30, the first support shaft 53 and the second support shaft 55 are arranged on the support frame 10, the first support shaft 53 supports the middle part of the first connecting arm 52, and the second support shaft 55 supports the middle part of the second connecting arm 54. The advantage of this arrangement is that the connecting shaft 51 connects the first connecting arm 52 and the first bracket 20, and when the lower end of the first bracket 20 swings under the drive of the driving assembly 40, the first connecting arm 52 is driven to swing through the connecting shaft 51; the first support shaft 53 supports the first connecting arm 52, and the other end of the first connecting arm 52 is hinged to the second connecting arm 54; firstly, the swinging of the lower end of the first bracket 20 can be transmitted to the second bracket 30 through the connecting rod assembly 50, thereby realizing synchronous swinging; secondly, the first bracket 20 and the second bracket 30 can be stretched and swung to a greater extent by swinging the first connecting arm 52 and the second connecting arm 54 to a smaller extent, thereby reducing the amplitude of the up and down swinging of the first connecting arm 52 and the second connecting arm 54, avoiding excessive occupation of height space, and helping to reduce the thickness of the support frame 10.

[0079] In one embodiment of the present application, see Figure 1 The second bracket 30 includes a support plate 31 and a telescopic plate 32. The telescopic plate 32 is slidably connected to the support plate 31; the telescopic plate 32 is hingedly connected to the second connecting arm 54. Under the movement of the second connecting arm 54, the telescopic plate 32 is driven to slide relative to the support plate 31, thereby increasing the length of the second bracket 30, making the length of the second bracket 30 adjustable to accommodate different user calf lengths; secondly, as the telescopic plate 32 slides, it also drives the support plate 31 to rotate upward, and the rotation and expansion are synchronized. Optionally, the end of the telescopic plate 32 near the support frame 10 is hinged to the second connecting arm 54. As the telescopic plate 32 gradually extends, the hinge point between the telescopic plate 32 and the second connecting arm 54 gradually approaches the free end of the support plate 31, which makes it easier to achieve the upward rotation of the support plate 31.

[0080] Optionally, the first support shaft 53 is slidably supported on the first connecting arm 52, and the second support shaft 55 is slidably supported on the second connecting arm 54. Under the drive of the drive assembly 40, the first bracket 20 moves to drive the first connecting arm 52 to slide on the first support shaft 53, and drives the second connecting arm 54 to slide on the second support shaft 55, so that the telescopic plate 32 is extended while driving the support plate 31 to rotate upward to adjust the angle between the second bracket 30 and the support frame 10 to adapt it to the posture of the user when lying down.

[0081] In one embodiment of this application, see Figures 2 to 5 The first connecting arm 52 is provided with a first hole 520, which is arranged along the length of the first connecting arm 52. The first support shaft 53 is inserted into the first hole 520, and the first connecting arm 52 is slidably supported on the first support shaft 53. This can reduce the weight of the first connecting arm 52, making it easier to move the first connecting arm 52, and can also provide a stable support for the first connecting arm 52.

[0082] In one embodiment of the present application, see Figures 2 to 5 The second connecting arm 54 is provided with a second hole 540, the second support shaft 55 is inserted into the second hole 540, and the second connecting arm 54 is slidably supported on the second support shaft 55. This facilitates a faster extension of the telescopic plate 32 to support the user's calf, and secondly reduces the weight of the second connecting arm 54, making it easier to move the second connecting arm 54.

[0083] In one embodiment of this application, see Figures 2 to 5 The second hole 540 includes a first sliding area 541 and a second sliding area 542. The first sliding area 541 is located at one end of the second connecting arm 54 close to the first connecting arm 52, and the second sliding area 542 is located at one end of the second connecting arm 54 close to the second bracket 30. The end of the first sliding area 541 away from the first connecting arm 52 is connected to the end of the second sliding area 542 away from the second bracket 30; from the end of the second connecting arm 54 close to the first connecting arm 52 to the middle of the second connecting arm 54, the first sliding area 541 is arranged to be tilted upward; from the middle of the second connecting arm 54 to the end of the second connecting arm 54 close to the second bracket 30, the second sliding area 542 is arranged to be tilted downward. The advantage of such a setting is that, under the drive of the driving assembly 40, the end of the first bracket 20 that cooperates with the support frame 10 moves toward the side of the second bracket 30, and the free end of the first bracket 20 swings downward to drive the first connecting arm 52 and the second connecting arm 54 to move toward the side of the second bracket 30. This movement process is divided into two stages: first, the second sliding area 542 slides along the second support shaft 55, and the second connecting arm 54 translates faster, so that the second bracket 30 swings at a larger angle, which facilitates the second bracket 30 to support the user's calf in time; then, when the second sliding area 542 slides across the second support shaft 55 and transitions to the first sliding area 541 to slide along the second support shaft 55, the connection is bent, so that the movement of the second connecting arm 54 slows down, thereby reducing the swing angle of the second bracket 30. This process effectively reduces the inertia of the second bracket 30 during swinging, giving the user a better experience, and secondly, it can also reduce the friction and collision between the second bracket 30 and the second connecting arm 54.

[0084] Specifically, the first sliding zone 541 and the second sliding zone 542 are both straight slides, forming a 35-degree angle between the first sliding zone 541 and the second sliding zone 542. Of course, a 5-degree difference is also possible. This arrangement allows for two sliding speeds: the first speed when the second sliding zone 542 slides along the second support shaft 55, and the second speed when the first sliding zone 541 slides along the second support shaft 55. These two speeds allow the second bracket 30 to swing at two different angular velocities, ensuring a comfortable user experience.

[0085] It should be noted that upward and downward are both used as reference when the dental chair is placed in a horizontal direction.

[0086] Optionally, the length of the first sliding area 541 is greater than the length of the second sliding area 542 , which can further speed up the support of the user's calf by the second bracket 30 .

[0087] The advantage of this arrangement is that the telescopic plate 32 can be quickly extended to support the user's legs. The specific working principle is: please refer to Figures 3 to 7 In the figure, point A is the position of the second support shaft 55, point B is the hinge point between the support plate 31 and the support frame 10, and point C is the hinge point between the second connecting arm 54 and the telescopic plate 32. The lines connecting points A, B and C form a triangle, where Figure 6 The zigzag solid line between points A and C corresponds to the second connecting arm 54, and the dotted line corresponds to the effective length of the second connecting arm 54; ∠A, ∠B and ∠C correspond to the lengths of the three sides a, b and c respectively, where line c is the distance from the hinge point between the second support shaft 55 and the support frame 10 to the hinge point between the support frame 10 and the second bracket 30, and its length is fixed. Line b is the length of the movement of the second connecting arm 54, and line a corresponds to the distance the telescopic plate 32 extends. Similarly, please refer to Figure 3 、 Figure 5 and Figure 7 ( Figure 7 It shows a connection diagram of the support frame 10, the second connecting arm 54 and the telescopic plate 32 when the second connecting arm 54 is a straight plate design), A1 corresponds to A, B1 corresponds to B, and C1 corresponds to C.

[0088] Using the law of cosines we know that:

[0089] a 2 =b 2 +c 2 -2b*c*COS∠A;

[0090] a1 2 =b1 2 +c1 2 -2b1*c1*COS∠A1;

[0091] At this time, c = c1. Assuming b = b1, it can be seen that ∠A > ∠A1. Therefore, COS∠A < COS∠A1, and it can be obtained that a > a1. So when the second connecting arm 54 moves the same length (i.e., when b = b1), the setting method of the second connecting arm 54 that slopes upward and then bends downward can make the telescopic plate 32 extend a longer distance than the straight-line setting method. Since the extending distances of the second connecting arms 54 are equal and the time used is equal, the solution provided in the embodiment of the present application can make the telescopic plate 32 extend a longer distance relatively quickly to support the user's legs.

[0092] In an embodiment of the present application, please refer to Figure 2 and Figure 8 , a first pin shaft 531 is installed at one end of the first support shaft 53 close to the first connecting arm 52. A first roller 532 is sleeved on the first pin shaft 531. The first roller 532 is located in the first hole 520. The first roller 532 is used for rolling and supporting the first connecting arm 52. It can reduce the frictional loss between the first support shaft 53 and the first connecting arm 52.

[0093] In an embodiment of the present application, please refer to Figure 2 and Figure 8 , a second pin shaft 551 is installed at one end of the second support shaft 55 close to the second connecting arm 54. A second roller 552 is sleeved on the second pin shaft 551. The second roller 552 is located in the second hole 540. The second roller 552 is used for rolling and supporting the second connecting arm 54. It can reduce the frictional loss between the second support shaft 55 and the second connecting arm 54.

[0094] In another embodiment of the present application, refer to Figure 2 and Figure 8 , a first pin shaft 531 is installed on one side of the first support shaft 53 close to the first connecting arm 52. A first roller 532 is sleeved on the first pin shaft 531. The first roller 532 is located in the first hole 520. The first roller 532 is used for rolling and supporting the first connecting arm 52; and a second pin shaft 551 is installed on one side of the second support shaft 55 close to the second connecting arm 54. A second roller 552 is sleeved on the second pin shaft 551. The second roller 552 is located in the second hole 540. The second roller 552 is used for rolling and supporting the second connecting arm 54. It can reduce the frictional losses between the first support shaft 53 and the first connecting arm 52, and between the second support shaft 55 and the second connecting arm 54.

[0095] In an embodiment of the present application, please refer to Figure 5 , a third hole 120 is formed in the support frame 10. The connecting seat is slidably inserted into the third hole 120. It is convenient for the connection between the first bracket 20 and the link assembly 50, and has a simple structure, making the overall space layout more compact and also saving materials.

[0096] Optionally, the third hole 120 is an arc-shaped hole that gradually bends upward from one end near the second bracket 30 to the free end near the first bracket 20. This arrangement has the advantage that while adjusting the position of the first bracket 20, the angle between the first bracket 20 and the support frame 10 can also be adjusted to better suit the user's posture when lying down, thereby improving the user's comfort.

[0097] In one embodiment of this application, see Figure 2 、 Figure 8 and Figure 9 A third support shaft 21 is slidably mounted in the third hole 120. The third support shaft 21 is connected to the first bracket 20, and the third support shaft 21 and the connecting shaft 51 are arranged side by side and spaced apart. This improves the stability of the first bracket 20. Optionally, the third support shaft 21 is inserted through the bottom of the first bracket 20, and both ends of the third support shaft 21 are slidably inserted into the third holes 120 defined at both ends of the support frame 10, thereby providing stable support for the first bracket 20.

[0098] In one embodiment of this application, see Figure 8 and Figure 9 , a third roller 211 is mounted on the third support shaft 21, and the third roller 211 is located in the third hole 120. The friction loss between the third support shaft 21 and the support frame 10 can be reduced. Optionally, a first limiting member 212 is also provided on the third support shaft 21. The first limiting member 212 is located at the end of the third support shaft 21 away from the first bracket 20. The first limiting member 212 is used to limit the position of the third roller 211 to prevent the third roller 211 from being separated from the restriction of the third hole 120. Specifically, the first limiting member 212 includes a first limiting block 2121 and a nut 2122. The first limiting block 2121 is sleeved on the end of the third support shaft 21 away from the first bracket 20, and the nut 2122 is threadedly connected to the end of the third support shaft 21 to fix the position of the first limiting block 2121.

[0099] In one embodiment of this application, see Figure 8 and Figure 9 A fourth roller 511 is mounted on the connecting shaft 51 and is located in the third hole 120, parallel to and spaced from the third roller 211. This reduces friction loss between the connecting shaft 51 and the support frame 10, and improves the linkage performance of the connecting rod assembly 50.

[0100] Optionally, a second limit member 512 is sleeved on the connecting shaft 51, and the second limit member 512 includes a second limit block 5121 and a connecting pin 5122. The second limit block 5121 is located between the fourth roller 511 and the first connecting arm 52, and is used to limit the position of the fourth roller 511; the connecting pin 5122 passes through the first connecting arm 52 and the second limit block 5121 and is plugged into the end of the connecting shaft 51 to realize the connection between the first connecting arm 52 and the connecting shaft 51. This design has a compact spatial layout and a simple structure.

[0101] In one embodiment of this application, see Figure 10 The dental chair provided herein also includes a drive assembly 40 for driving the first bracket 20 to slide on the second support base 12. The drive assembly 40 is mounted on the second support base 12, and the power output end of the drive assembly 40 is hingedly connected to the first bracket 20. By controlling the drive assembly 40, the first bracket 20 and the second bracket 30 can be linked, providing convenient operation. Optionally, the drive assembly 40 is a telescopic motor to facilitate stable movement of the first bracket 20.

[0102] In one embodiment of the present application, see Figures 11 to 13 The support frame 10 includes a first support base 11, a second support base 12, a first connecting member 13, and a second connecting member 14. One end of the second support base 12 is hingedly connected to the first support base 11, one end of the first connecting member 13 is connected to the first bracket 20, and the other end of the first connecting member 13 is hingedly connected to the first support base 11. The second connecting member 14 is configured to rotate upward at the end of the second support base 12 near the second bracket 30 when the free end of the first bracket 20 swings downward. In this way, the first bracket 20 and the second support base 12 can be linked together, allowing for a wider range of angles to be formed between them, thereby facilitating support for the user's back and improving user comfort.

[0103] In one embodiment of the present application, see Figures 11 to 13 The first connecting member 13 includes a first arm 131, a second arm 132, and a first hinge shaft 133. One end of the first arm 131 is hingedly connected to the first bracket 20, one end of the second arm 132 is hingedly connected to the other end of the first arm 131, one end of the first hinge shaft 133 is connected to the other end of the second arm 132, and the first support base 11 is hingedly connected to the other end of the first hinge shaft 133. In this way, the first arm 131 and the second arm 132 strengthen the connection strength between the first bracket 20 and the first support base 11 and improve the flexibility of the first bracket 20.

[0104] In one embodiment of the present application, see Figures 11 to 13The first connecting member 13 includes a first support arm 131, a second support arm 132 and a first hinge shaft 133, one end of the first support arm 131 is hingedly connected to the first bracket 20, one end of the second support arm 132 is hingedly connected to the other end of the first support arm 131, one end of the first hinge shaft 133 is connected to the other end of the second support arm 132, and the first support seat 11 is hingedly connected to the other end of the first hinge shaft 133; the second connecting member 14 includes a connecting plate 141 and a second hinge shaft 142, one end of the connecting plate 141 is hingedly connected to the middle part of the second support seat 12, one end of the second hinge shaft 142 is connected to the other end of the connecting plate 141, and the other end of the second hinge shaft 142 is hingedly connected to an end of the second support arm 132 away from the first support arm 131; the rotation centers of the first hinge shaft 133 and the second hinge shaft 142 do not coincide ( Figure 13 In the figure, the two dotted lines represent the rotation centers of the first hinge axis 133 and the second hinge axis 142, respectively. With this arrangement, when the free end of the first bracket 20 swings downward, it drives the first arm 131 to move in the X direction, thereby driving the second arm 132 to rotate about the first support base 11. Simultaneously, the connecting plate 141, which is hingedly connected to the second arm 132, also rotates. Because the rotation centers of the first hinge axis 133 and the second hinge axis 142 do not coincide, the end of the second support base 12 closest to the second bracket 30 rotates upward in response to the rotation of the connecting plate 141.

[0105] See also Figures 3 to 5 , Figure 3 This is a schematic diagram of the dental chair disclosed in the embodiment of the present application when it is not unfolded. Figure 4 This is a diagram of the dental chair when it is unfolded. Figure 5 It is a schematic diagram of the dental chair after it is fully unfolded; it can be seen from the above that when the free end of the first bracket 20 gradually swings downward, under the action of the connecting rod assembly 50, the second bracket 30 rotates upward, and the telescopic plate 32 gradually extends to support the user's legs; at the same time, the second support seat 12 rotates upward at one end close to the second bracket 30, realizing the linkage cooperation between the first bracket 20, the second bracket 30 and the second support seat 12, so that the three form a more ergonomic angle, which is convenient for supporting the user's back, buttocks and legs, and improving the comfort of using the dental chair.

[0106] See Figures 12 to 14After the second hinge shaft 142 is connected to the connecting plate 141 and the second support arm 132, there is a gap between the connecting plate 141 and the second support arm 132, and the width of the gap is greater than the thickness of the side wall of the second support base 12; the connecting plate 141 is installed on the outside of the second support base 12, and the second support arm 132 is located on the inside of the second support base. When the first bracket 20 is matched with the second support base 12, the second support base 12 has a reserved installation position for the cable 121 and the drive assembly 40. Because a large space is required for the drive assembly 40, the drive assembly 40 protrudes from the outside of the second support base 12. At this time, the first support shaft 53, the second support shaft 55 and the fourth roller 511 ( Figure 9 As shown in FIG, the first connecting arm 52 and the second connecting arm 54 are arranged outward to avoid the protruding portion of the driving assembly 40. Therefore, there is a gap between the first connecting arm 52 and the second connecting arm 54 and the side wall of the second support base 12, and the connecting plate 141 is installed in the gap, making full use of the space. Figure 14 Since the connecting plate 141 is installed on the outside of the second support seat 12, there is no need to worry about interference with the connecting plate 141 when the bottom of the first bracket 20 cooperates with the second support seat 12, so the installation positions reserved for the first connecting member 13 and the second connecting member 14 can be smaller, thereby further making the overall structure of the dental chair more compact.

[0107] In one embodiment of this application, please refer to Figure 15 and Figure 16 The support plate 31 is provided with a slide rail 33, and the telescopic plate 32 is provided with a slider 34, which slidably engages with the slide rail 33. This allows the telescopic plate 32 to slide on the support plate 31, reducing sliding resistance and facilitating the extension of the telescopic plate 32 to support the user's legs. Optionally, there are two slide rails 33, one on each side of the support plate 31 and extending along the length of the support plate 31. Four sliders 34 are provided, each slide rail 33 slidably connecting two sliders 34, stably supporting the telescopic plate 32 and enabling the telescopic plate 32 to slide quickly and stably on the support plate 31.

[0108] In one embodiment, a back cushion (not shown in the figure) is detachably mounted on the first bracket 20, a seat cushion (not shown in the figure) is detachably mounted on the second support seat 12, and a foot pad (not shown in the figure) is detachably mounted on the telescopic plate 32. The back cushion, seat cushion and foot pad are all made of soft materials, such as soft silicone, cotton and other materials, which further improves the user's comfort.

[0109] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A dental chair, characterized in that: include: Support frame; a first bracket movably mounted on one end of the support frame; a second bracket, one end of which is hinged to the other end of the support frame, and the second bracket and the first bracket are respectively located on opposite sides of the support frame; a driving assembly, configured to drive the first bracket to move, the driving assembly being mounted on the support frame, and a power output end of the driving assembly being connected to the first bracket; as well as, a connecting rod assembly, configured to drive the second bracket to rotate upward when the free end of the first bracket swings downward, the connecting rod assembly being connected by transmission between the first bracket and the second bracket, and the connecting rod assembly being mounted on the support frame; The connecting rod assembly includes a connecting shaft connected to the first bracket, a first connecting arm connected to the connecting shaft at one end, a first supporting shaft supporting the middle portion of the first connecting arm, a second connecting arm hingedly connected to the other end of the first connecting arm at one end, and a second supporting shaft supporting the middle portion of the second connecting arm, the other end of the second connecting arm being hingedly connected to the second bracket, and the first supporting shaft and the second supporting shaft being arranged on the support frame; A second hole is formed on the second connecting arm, the second supporting shaft is inserted into the second hole, and the second connecting arm is slidably supported on the second supporting shaft; The second hole includes a first sliding area and a second sliding area connected to the first sliding area. The first sliding area is arranged to be inclined upward from the end of the second connecting arm close to the first connecting arm to the middle of the second connecting arm. The second sliding area is arranged to be inclined downward from the middle of the second connecting arm to the end of the second connecting arm close to the second bracket.

2. The dental chair according to claim 1, wherein: A first hole is formed on the first connecting arm and is arranged along the length direction of the first connecting arm. The first supporting shaft is inserted into the first hole, and the first connecting arm is slidably supported on the first supporting shaft.

3. The dental chair according to claim 1, wherein: A first pin is installed on the side of the first support shaft close to the first connecting arm, a first roller is sleeved on the first pin, and the first roller supports the first connecting arm; and / or a second pin is installed on the side of the second support shaft close to the second connecting arm, a second roller is sleeved on the second pin, and the second roller supports the second connecting arm.

4. The dental chair according to claim 1, wherein: The second bracket includes a support plate hingedly connected to the support frame and a telescopic plate slidably connected to the support plate, and the telescopic plate is hingedly connected to the second connecting arm.

5. The dental chair according to claim 1, wherein: The support frame is provided with a third hole, and the connecting shaft is slidably inserted into the third hole.

6. The dental chair according to any one of claims 1 to 5, wherein: The support frame comprises: a first support seat; a second support base, one end of the second support base being hingedly connected to the first support base; a first connecting member, one end of which is connected to the first bracket, and the other end of which is hingedly connected to the first support seat; and The second connecting member is used to drive the end of the second support seat close to the second bracket to rotate upward when the free end of the first bracket swings downward.

7. The dental chair according to claim 6, wherein: The first connecting member includes a first arm hingedly connected to the first bracket at one end, a second arm hingedly connected to the other end of the first arm, and a first hinge shaft connected to the other end of the second arm at one end, and the other end of the first hinge shaft is hingedly connected to the first support seat; the second connecting member includes a connecting plate hingedly connected to the middle of the second support seat and a second hinge shaft at one end to the other end of the connecting plate, and the other end of the second hinge shaft is hingedly connected to the end of the second arm away from the first arm; the rotation centers of the first hinge shaft and the second hinge shaft do not coincide.

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