Dental chair

Abstract

The dental treatment chair relates to the technical field of medical devices, including a headrest, a base, a seat and a backrest. The headrest is used to fix the patient's head. The backrest and the seat are rotatably connected to the base respectively, and the backrest and the seat can be independently rotated laterally. The seat and the backrest are rotatably connected to the base respectively, so that they can be independently rotated laterally around their respective rotation axes. When the patient turns sideways, the backrest will not swing with the seat, so it will not pull the patient's upper or lower body, reducing the risk of the patient's neck being strained.

Description

Technical Field

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

[0002] Patent document CN112494269A, entitled "A dental treatment chair auxiliary device with head fixation function", discloses a dental treatment chair auxiliary device, which can fix the patient's head when in use to prevent the dental patient's head from shaking during treatment and affecting the treatment. The chair seat and the chair back can be rotated sideways to a certain angle, so that when the patient's head is fixed, the patient can move sideways to a certain extent and turn the body sideways to relieve the discomfort and tension of maintaining a posture for a long time. The seat and backrest of the device disclosed in the above patent are fixedly connected together. The backrest cannot rotate independently, but can only rotate around the rotation axis of the seat at the same time as the seat. There is a certain angle between the backrest and the seat, and the two are not flush. The axis of lateral rotation of the seat has a large angle with the backrest. When the seat rotates laterally, the backrest does not simply rotate laterally, but swings with the connection between it and the seat as the origin while rotating laterally. The closer to the head, the greater the swing amplitude, which will pull the upper or lower body of the patient lying on the chair back. When the patient's head is fixed, the patient's upper body being pulled can easily cause neck strain. Summary of the invention

[0003] In view of this, the present invention provides a dental treatment chair, wherein the seat and the backrest can rotate independently, and the backrest does not swing with the seat, thereby not pulling the upper body or the lower body of the patient.

[0004] To achieve the above objectives, the present invention provides the following technical solutions.

[0005] The dental treatment chair includes a headrest, a base, a seat and a backrest. The headrest is used to fix the patient's head. The backrest and the seat are rotatably connected to the base respectively, and the backrest and the seat can be independently rotated laterally. The seat and the backrest are rotatably connected to the base respectively, so that they can be independently rotated laterally around their respective rotation axes. When the patient turns sideways, the backrest will not swing with the seat, so it will not pull the patient's upper or lower body, reducing the risk of the patient's neck being strained.

[0006] Furthermore, the chair back is provided with a lateral support mechanism, which includes two lateral support plates, which are respectively hinged on both sides of the chair back so as to be flippable. When the chair back rotates to one side, the lateral support plate on that side flips inward to provide support for the patient on that side, thereby preventing the patient from sliding toward that side.

[0007] Furthermore, the lateral support plate includes a support plate body, a support pad and a first spring. The support pad is used to contact the patient. The support pad is slidably connected to the support plate body so as to be able to slide laterally. The first spring is connected to the support pad to provide the elastic force required for the support pad to reset after sliding. When the lateral support plate is flipped, the support pad in contact with the patient slides laterally relative to the support plate body so that the support pad does not slide relative to the patient, thereby avoiding pulling the patient's clothes.

[0008] Furthermore, the lateral support mechanism also includes a supporting slider, a rotational return spring and a guide slide bar. The guide slide bar is laterally arranged and fixed to the base so as not to rotate laterally with the chair back. The supporting slider is hinged to the lateral support plate and slidably connected to the guide slide bar. When the chair back rotates to one side, the lateral support plate on that side is supported by the supporting slider hinged to it and flips inward relative to the chair back. The rotational return spring is connected to the guide slide bar and the supporting slider. The rotational return spring can elastically push the supporting slider to reset so as to reset the chair back.

[0009] Furthermore, the lateral support mechanism also includes an anti-pinch component, which includes a gap-filling airbag. The gap-filling airbag fills the gap between the support cushion and the chair back to prevent the lateral support plate from pinching the patient or the patient's clothing during the flipping process.

[0010] Furthermore, the anti-pinch assembly also includes an inflatable cylinder, an inflating and discharging passage and an air release valve. The inflatable cylinder is hinged to the lateral support plate so that it can be pushed by the lateral support plate. The inflating and discharging passage connects the inflatable cylinder and the gap-filling airbag. The air release valve includes an air release piston, an air release chamber, an air release port and a second spring. The air release port connects the air release chamber and the outside. The air release piston is arranged in the air release chamber and can slide in the air release chamber to open and close the air release port. The second spring is connected to the air release piston to provide elastic force for the air release piston to reset. The air release chamber is connected to the inflating and discharging passage. When the lateral support plate is flipped inward, the gap-filling airbag is squeezed. The air pressure in the gap-filling airbag increases and pushes the air release piston to slide to open the air release port. The gap-filling airbag is deflated through the air release port to avoid expansion and pushing out of the gap and squeezing the patient. After the air pressure in the gap-filling airbag drops, the second spring drives the air release piston to reset to close the air release port. When the lateral support plate is flipped outward, the lateral support plate pushes the inflatable cylinder to inflate the gap-filling airbag.

[0011] Furthermore, there are multiple deflation ports, each of which is arranged along the sliding direction of the deflation piston. The higher the air pressure in the gap-filling airbag, the farther the deflation piston is pushed to slide and the more deflation ports are opened, thereby accelerating the deflation speed.

[0012] Furthermore, the deflation piston is provided with an overflow air channel, which is connected to the outside. When the pressure in the gap-filling airbag reaches a preset value, the deflation piston is pushed to a preset position, and the overflow air channel is connected to the inflation cylinder, so that the gas in the inflation cylinder flows to the outside through the overflow air channel and cannot be filled into the gap-filling airbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the dental treatment chair of the present invention.

[0014] Figure 2 Schematic diagram of the rotational connection between the chair back and the chair seat and the base in the embodiment (partial structure has been hidden for convenience of display).

[0015] Figure 3 Exploded view of a dental chair.

[0016] Figure 4 for Figure 3 Enlarged schematic diagram of point C in the middle.

[0017] Figure 5 (a) is a schematic diagram of the initial state of the seat back and the lateral support plate, and (b) is a schematic diagram of the movement of the seat back and the lateral support plate when the seat back rotates to the left (part of the structure has been hidden for the convenience of display).

[0018] Figure 6 A cross-sectional view of the chair back.

[0019] Figure 7 A partial cross-sectional view of the seat back, lateral support plate and anti-pinch assembly.

[0020] Figure 8 for Figure 7 Enlarged schematic diagram of point D in the middle.

[0021] Reference numerals include:

[0022] Chair back 1, lateral support plate 11, support plate body 111, support pad 112, first spring 113, support slider 12, guide slide bar 13, rotation return spring 14, gap filling airbag 15, inflatable cylinder 16, air-blocking cover 161, cover body 1611, air inlet 162, air outlet 163, charging and discharging air channel 17, air release valve 18, air release piston 181, overflow air channel 1811, air release chamber 182, air release port 183, second spring 184, connecting plate 19;

[0023] Seat 2, mounting seat 21, rotating shaft 22, fixing rod 23, spring damper 24, cylinder mounting frame 25;

[0024] Base 3, head support 4. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with specific embodiments.

[0026] like Figure 1 As shown, the dental treatment chair of this embodiment includes a headrest 4, a base 3, a seat 2 and a chair back 1. The headrest 4 is used to fix the patient's head, and the chair back 1 and the seat 2 are rotatably connected to the base 3, respectively. Figure 2As shown, the base 3 is fixed with a mounting seat 21, and the backrest 1 is rotatably connected to the mounting seat 21. The rotatable connection can be achieved through bearings, sleeves, etc., which are not limited here. The seat 2 is rotatably connected to the base 3 through a rotating shaft 22, so that the backrest 1 and the seat 2 can be independently rotated laterally around their respective rotating shafts. Figure 3 As shown, spring dampers 24 are provided on both sides below the seat 2 to provide elastic force for restoring the seat 2. When the patient turns sideways, the seat 2 and the backrest 1 can independently rotate laterally around their respective rotation axes, and the backrest 1 will not swing with the seat 2, so the patient's upper or lower body will not be pulled, reducing the risk of the patient's neck being strained.

[0027] When the patient turns sideways, the chair back 1 rotates to one side. After the chair back 1 rotates sideways, it tilts toward that side. The patient's body may slide to that side due to insufficient support. Figure 3-5 The chair back 1 of this embodiment is provided with a lateral support mechanism, which includes two lateral support plates 11, which are respectively hinged on both sides of the chair back 1 and can be turned over. The lateral support mechanism also includes a support slider 12, a rotation return spring 14 and a guide slide bar 13. Two guide slide bars 13 are provided side by side up and down. A fixed rod 23 is fixed on the mounting seat 21. The two guide slide bars 13 are fixedly installed on the fixed rod 23 in parallel and do not rotate laterally with the chair back 1. There are four support sliders 12, each lateral support plate 11 is respectively hinged with two support sliders 12, and the two support sliders 12 are respectively slidably connected to the two guide slide bars 13. In this embodiment, a connecting plate 19 is further provided to connect the two support sliders 12. There are four rotation return springs 14, which correspond to the support sliders 12 one by one. Each rotation return spring 14 is respectively connected to the guide slide bar 13 and the support slider 12, so as to provide elastic force for the support slider 12 to return.

[0028] like Figure 5 As shown in (a), in the initial state, the chair back 1 does not rotate laterally, the rotation return springs 14 on both sides are in a natural length state, and the two lateral support plates 11 are turned inwards to maintain a certain angle with the chair back 1. Figure 5When the chair back 1 shown in (b) rotates to one side (set to the left), with the cooperation of the left support slider 12 and the guide slide bar 13, the chair back 1 drives the left lateral support plate 11 to flip inward, and the left lateral support plate 11 simultaneously pushes the left support slider 12 to slide to the left along the guide slide bar 13, and the left rotation return spring 14 is compressed; with the cooperation of the right support slider 12 and the guide slide bar 13, the chair back 1 drives the right lateral support plate 11 to flip outward, and the right lateral support plate 11 simultaneously pushes the right support slider 12 to slide to the right along the guide slide bar 13, and the right rotation return spring 14 is stretched; when the patient loses contact with the chair back 1, the left rotation return spring 14 pushes the left support slider 12 to return, and the right rotation return spring 14 pulls the right support slider 12 to return, thereby returning the chair back 1 to its initial state. If there are no supporting sliders 12 and guiding slide bars 13, when the chair back 1 rotates to one side, the lateral supporting plate 11 will only "droop" under the action of gravity and will not flip inward. It is by hingedly connecting the lateral supporting plate 11 to the supporting sliders 12 and slidingly connecting the supporting sliders 12 to the laterally fixed guiding slide bars 13 that the lateral supporting plate 11 is supported and flipped when the chair back 1 rotates, and at the same time pushes the supporting sliders 12 to slide outward along the guiding slide bars 13. In this way, when the chair back 1 rotates to one side, the lateral supporting plate 11 on that side can flip inward and can dynamically flip with the rotation angle of the chair back 1, thereby providing support for the patient and preventing the patient from sliding down due to insufficient support.

[0029] When the lateral support plate 11 is turned over to support the patient, relative sliding may occur between the patient and the lateral support plate 11, and the skin or clothes pressed between the patient and the lateral support plate 11 may be pulled tight, which may easily increase the patient's discomfort and tension. Figure 6 As shown, the lateral support plate 11 includes a support plate body 111, a support pad 112 and a first spring 113. The support pad 112 is used to contact the patient. The support pad 112 of this embodiment is provided with a sliding sleeve (not shown in the figure), and the support plate body 111 is provided with a sliding rod (not shown in the figure). The support pad 112 is mounted on the sliding rod of the support plate body 111 through the sliding sleeve, so that the support pad 112 can slide laterally relative to the support plate body 111. The first spring 113 is connected to the support pad 112 to provide the elastic force required for the support pad 112 to reset after sliding. When the lateral support plate 11 is flipped over, the support pad 112 in contact with the patient can slide laterally relative to the support plate body 111, so that the support pad 112 does not slide relative to the patient, thereby avoiding pulling the patient's clothes. The support pad 112 is slidably connected to the support plate body 111, so that when the lateral support plate 11 is flipped, the support pad 112 in contact with the patient can slide laterally relative to the support plate body 111 but does not slide relative to the patient, thereby avoiding pulling of the patient's skin or clothing at the pressure site, thereby improving the patient's comfort.

[0030] Since the support pad 112 can slide sideways, the patient's body or clothing may be embedded in the gap between the support pad 112 and the chair back 1, and the patient or the patient's clothing may be caught in the process of turning over the lateral support plate 11. Figure 6 As shown, the lateral support mechanism also includes an anti-pinch component, which includes a gap-filling airbag 15. The gap-filling airbag 15 fills the gap between the support pad 112 and the chair back 1 to prevent the lateral support plate 11 from pinching the patient or the patient's clothes during the flipping process. At the same time, because the airbag itself is relatively soft and elastically deformable, the support pad 112 can squeeze the gap-filling airbag 15 when it moves, and will not be blocked by the gap-filling airbag 15 and unable to move, thereby preventing the patient from being pinched and not affecting the movement of the lateral support plate 11.

[0031] The gap-filling airbag 15 will be pushed out of the gap after being squeezed and expanded, thereby squeezing the patient's body and causing discomfort. Figure 3 , Figure 4 , Figure 7 and Figure 8 The anti-pinch component also includes an inflatable cylinder 16, an air charging and discharging passage 17 and an air release valve 18. The inflatable cylinder 16 is fixed to the rear of the chair back 1 through a cylinder mounting frame 25. The inflatable cylinder 16 is connected to the connecting plate 19 so that it can be driven by the lateral support plate 11. The inflatable and discharging passage 17 connects the inflatable cylinder 16 and the gap-filling airbag 15. The air release valve 18 includes an air release piston 181, an air release chamber 182, an air release port 183 and a second spring 184. The air release port 183 connects the air release chamber 182 and the outside. The air release piston 181 is arranged in the air release chamber 182 and can slide in the air release chamber 182 to open and close the air release port 183. The second spring 184 is connected to the air release piston 181 to provide a reset elastic force for the air release piston 181. The air release chamber 182 is connected to the inflatable and discharging passage 17. The inflatable cylinder 16 is also provided with an air-blocking cover 161, which is respectively arranged at the air inlet 162 and the air outlet 163 of the inflatable cylinder 16 so that the air flow can only pass in one direction. The air-blocking cover 161 includes a cover body 1611 and a return torsion spring (not shown in the figure). Taking the air-blocking cover 161 at the air outlet 163 as an example, the cover body 1611 is hinged at the air outlet 163. When the inflatable cylinder 16 inflates the gap-filling airbag 15, the air flow pushes the cover body 1611 open to enter the charging and discharging air channel 17. When the inflatable cylinder 16 is evacuated, the return torsion spring covers the cover body 1611 to close the air outlet 163, and the air flow cannot enter the inflatable cylinder 16 from the charging and discharging air channel 17. When the lateral support plate 11 is turned inward, the gap-filling airbag 15 is squeezed, and the air pressure in the gap-filling airbag 15 increases, pushing the deflation piston 181 to slide to open the deflation port 183. The gap-filling airbag 15 deflates through the deflation port 183 to avoid expanding out of the gap and squeezing the patient. After the air pressure in the gap-filling airbag 15 drops, the second spring 184 drives the deflation piston 181 to return to its original position to close the deflation port 183. When the lateral support plate 11 is turned outward, Figure 5The flip direction of the right side support plate shown in (b) is outward flipping. Figure 5 Taking the right lateral support plate 11 shown in (b) as an example, the lateral support plate 11 pushes the support slider 12 and the connecting plate 19 to slide leftward, and the connecting plate 19 thereby pushes the inflation cylinder 16 to inflate the gap-filling airbag 15 .

[0032] By providing the inflatable cylinder 16, the inflating and discharging air channel 17 and the deflation valve 18, the gap-filling airbag 15 is deflated through the deflation valve 18 when it is squeezed, so as to prevent it from expanding and pushing out, thereby not compressing the patient. When the lateral support plate 11 is turned outward, the gap between the support cushion 112 and the chair back 1 becomes larger, and the lateral support plate 11 drives the inflatable cylinder 16 to inflate the gap-filling airbag 15, so that the gap-filling airbag 15 is refilled with gas to fill the gap. Such a dynamic adaptive design allows the gap-filling airbag 15 to prevent the patient from being pinched by the gap, and at the same time, it will not form a pressure point on the patient due to expansion and pushing out, causing discomfort, thereby improving the patient's comfort.

[0033] The greater the amplitude of the flipping of the support pad 112 with the lateral support plate 11, the greater the degree of squeezing of the gap-filling airbag 15, resulting in more ejected parts. The deflation speed of a single deflation port 183 may not be able to keep up. If the deflation is not timely, the gap-filling airbag 15 will still expand and be ejected for a long period of time, causing discomfort to the patient. Therefore, multiple deflation ports 183 can be provided, and the number can be set according to the actual required deflation speed, such as Figure 8 As shown, the present embodiment is provided with seven air release ports 183, each of which is arranged along the sliding direction of the air release piston 181. The higher the air pressure in the gap-filling airbag 15, the longer the air release piston 181 is pushed to slide and the more air release ports 183 are opened, thereby accelerating the air release speed, achieving the effect that the higher the air pressure in the gap-filling airbag 15, the faster the air release speed of the air release valve 18, thereby avoiding the gap-filling airbag 15 from being ejected due to untimely air release.

[0034] The patient may move his body multiple times in a short period of time to adjust his posture. There is a situation where the lateral support plate 11 rotates multiple times quickly, causing the gap-filling airbag 15 to be inflated multiple times in a short period of time, such as Figure 8 As shown, in order to cope with the extreme situation that the filling airbag 15 may be inflated multiple times, an overflow air channel 1811 is provided in the deflation piston 181, and the overflow air channel 1811 is connected to the outside. A second spring 184 with appropriate elastic force is selected according to the air pressure that the filling airbag 15 can withstand. When the air pressure in the filling airbag 15 reaches a preset value, the air pressure pushes the deflation piston 181 to move to a preset position, so that the overflow air channel 1811 is connected to the inflation cylinder 16, so that the gas in the inflation cylinder 16 flows to the outside through the overflow air channel 1811 and cannot be filled into the filling airbag 15, thereby preventing the air pressure in the filling airbag 15 from rising further.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A dental treatment chair, comprising a headrest, a base, a seat and a backrest, wherein the headrest is used to fix the patient's head, and is characterized in that: The backrest and the seat are rotatably connected to the base respectively, and the backrest and the seat can be independently rotated laterally; The chair back is provided with a lateral support mechanism, which includes two lateral support plates, which are respectively hinged to both sides of the chair back so as to be flippable. When the chair back rotates to one side, the lateral support plate on that side flips inward to provide support for the patient on that side, thereby preventing the patient from sliding toward that side. The lateral support plate comprises a support plate body, a support pad and a first spring, the support pad is used to contact with the patient, the support pad is slidably connected to the support plate body so as to be able to slide laterally, the first spring is connected to the support pad to provide the elastic force required for the support pad to reset after sliding, when the lateral support plate is turned over, the support pad in contact with the patient slides laterally relative to the support plate body, so that the support pad does not slide relative to the patient, thereby avoiding pulling the patient's clothes; The lateral support mechanism also includes an anti-pinch component, which includes a gap-filling airbag, which fills the gap between the support cushion and the chair back to prevent the lateral support plate from pinching the patient or the patient's clothing during the flipping process; The anti-pinch component also includes: an air-filled cylinder, which is hinged to the lateral support plate so as to be pushed by the lateral support plate; An air charging and discharging passage connecting the air charging cylinder and the gap-filling air bag; The air release valve comprises an air release piston, an air release chamber, an air release port and a second spring, wherein the air release port is connected to the air release chamber and the outside, the air release piston is arranged in the air release chamber and can slide in the air release chamber to open and close the air release port, the second spring is connected to the air release piston to provide elastic force for resetting the air release piston, and the air release chamber is connected to the charging and discharging passage; When the lateral support plate is flipped inward, the gap-filling airbag is squeezed, and the air pressure in the gap-filling airbag increases to push the deflation piston to slide to open the deflation port. The gap-filling airbag deflates through the deflation port to prevent it from expanding and pushing out of the gap to squeeze the patient. After the air pressure in the gap-filling airbag drops, the second spring drives the deflation piston to reset to close the deflation port. When the lateral support plate is flipped outward, the lateral support plate pushes the inflation cylinder to inflate the gap-filling airbag.

2. The dental treatment chair according to claim 1, characterized in that: The lateral support mechanism also includes a support slider, a rotation return spring and a guide slide bar. The guide slide bar is arranged laterally and fixed to the base so as not to rotate laterally with the chair back. The support slider is hinged to the lateral support plate and slidably connected to the guide slide bar. When the chair back rotates to one side, the lateral support plate on that side is supported by the support slider hinged to it and flips inward relative to the chair back. The rotation return spring is connected to the guide slide bar and the support slider. The rotation return spring can elastically push the support slider to reset so as to reset the chair back.

3. The dental treatment chair according to claim 1, characterized in that: There are multiple deflation ports, each of which is arranged along the sliding direction of the deflation piston. The higher the air pressure in the gap filling airbag, the farther the deflation piston is pushed to slide and the more deflation ports are opened, thereby accelerating the deflation speed.

4. The dental treatment chair according to claim 1, characterized in that: The deflation piston is provided with an overflow air channel, which is connected to the outside. When the pressure in the gap-filling air bag reaches a preset value, the deflation piston is pushed to a preset position, and the overflow air channel is connected to the inflation cylinder, so that the gas in the inflation cylinder flows to the outside through the overflow air channel and cannot be filled into the gap-filling air bag.

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