Damping mechanism of armrest device of dental chair

Abstract

The utility model discloses a damping mechanism of a dental chair armrest device. The damping mechanism comprises a multi-gear telescopic rod, an armrest assembly and an angle fixing assembly. The handle assembly is connected with the top end of the telescopic rod through a rotating shaft, a hand support is slidably connected with the moving block, and damping stepless adjustment is achieved through a clamping sleeve structure controlled by a rotary knob. And the angle fixing assembly realizes rapid angle locking through a gear clamping mechanism. According to the device, damping adjustment, horizontal positioning and angle locking functions are innovatively and modularly integrated, accurate adjustment of damping force can be completed through a single knob, and multi-position quick positioning of the hand support is achieved in cooperation with a spring latch structure. Compared with the prior art, the device has the advantages of simplicity and convenience in operation, high adjusting precision, convenience in maintenance and the like, can effectively adapt to sitting and lying posture requirements of different patients, and remarkably improves the dental diagnosis and treatment comfort. The whole structure is compact and reliable, all functional assemblies do not interfere with one another, the service life is long, and good clinical application value is achieved.

Description

Technical Field

[0001] This utility model relates to the field of dental chair armrest technology, specifically a damping mechanism for a dental chair armrest device. Background Technology

[0002] Dental chair armrest assemblies typically consist of a seat frame and armrests. The armrests are rotatably connected to the seat frame. Specifically, the armrests have an armrest shaft with an annular groove. An O-ring is fitted into the groove, and the armrest shaft is then inserted into the seat frame. This achieves the rotatable connection between the armrest and the seat frame. The O-ring seals the gap between the armrest shaft and the seat frame, providing frictional damping force for the armrest's rotation relative to the seat frame. However, because the gap between the armrest shaft and the seat frame cannot be adjusted, the magnitude of the damping force for the armrest's rotation relative to the seat frame cannot be adjusted.

[0003] Publication number CN221451072U discloses a damping adjustment component for the armrest assembly of a dental chair, including a chair frame assembly and an armrest assembly. The armrest assembly includes an armrest seat, an armrest pivot, a limiting coupling assembly, an armrest connector, a spring, an end cap, a damping pad, and an armrest body. The armrest seat has a limiting groove at one end that engages with the armrest seat, and a side flange at the other end, with multiple adjusting screws on the side flange. The armrest seat is fitted onto the outside of the armrest pivot, and the end of the armrest seat is fixed to the chair frame assembly. The limiting coupling assembly includes a limiting block and a connecting shaft connected to the limiting block. The damping between the damping pad and the armrest connector is increased by increasing the screw insertion depth of the adjusting screws. Multiple adjusting screws can adjust the depth of insertion, thereby adjusting the damping force to meet the needs of different users and allowing for the setting of the armrest's fixed position. The armrest can be easily and freely locked by the wedge-shaped spring-loaded engagement of the limiting coupling assembly. However, this patent still has the following problems in actual use:

[0004] First, each adjustment requires adjusting multiple screws, which is inconvenient. Second, the damping pad is a consumable part, and since it is located inside the seat, it is extremely inconvenient to replace. Furthermore, the connection point between the existing dental armrest and the support rod is fixed, meaning the dental armrest can only move up and down along the support rod. Since people's height, arm length, and sitting posture are all different, the arm position is likely to be different. This means that while the armrest can support the arm well when sitting, it cannot properly support the patient's arm when lying down.

[0005] A damping mechanism for a dental chair armrest is proposed to address the problems mentioned above. Utility Model Content

[0006] The purpose of this utility model is to provide a damping mechanism for a dental chair armrest device to solve the problems mentioned in the background art. Currently, by installing the air blower of the static eliminator inside the sleeve of the rotating roller, the ion air is blown out from the inside to the outside through the sleeve, which cannot actually have an effect on the outermost film. At the same time, because the film is rolled up on the outer wall of the sleeve, the ion air cannot be blown out, thus affecting the static removal effect. In addition, the film may roll up during the ion air blowing process, causing the subsequent shearing to deviate. Furthermore, the fixed air delivery channel has a small elimination range, which has certain limitations.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a damping mechanism for a dental chair armrest device, comprising a multi-position telescopic rod, wherein the bottom end of the multi-position telescopic rod is rotatably connected to a first rotating shaft;

[0008] The top of the multi-stage telescopic rod is provided with a handle assembly, and the bottom of the multi-stage telescopic rod is provided with a fixed angle assembly.

[0009] The handle assembly includes a second rotating shaft rotatably mounted on the top of a multi-stage telescopic rod. The second rotating shaft is rotatably connected to a connecting plate. A movable block is fixedly connected to the top of the connecting plate. A hand rest is provided above the movable block. A fixing sleeve is bolted to one side of the connecting plate. A knob is threaded to the end of the fixing sleeve. A clip is fixedly connected inside the fixing sleeve. A rubber pad is adhered to the inner side of the clip. A pressing slope is provided on the outer side of the clip near the knob. A clearance slope is provided on the inner side of the knob near the clip.

[0010] The hand support has a horizontal groove at its bottom, the moving block is slidably connected to the horizontal groove, the moving block has a cavity in its middle, a first spring is fixedly connected symmetrically to the cavity, a first locking block is fixedly connected to the top of the first spring, a rack is fixedly connected to the inner top surface of the horizontal groove, and the first locking block is engaged with the rack.

[0011] Preferably, the fixed angle assembly includes a mounting shell fixed to the outer side of the bottom of the multi-stage telescopic rod, a gear fixedly connected to the outside of the first rotating shaft, a movable block slidably installed inside the mounting shell, a second locking block fixedly connected to the bottom end of the movable block, a second spring fixedly connected to the top end of the movable block, a lever fixedly connected to the outer side of the movable block, and an outer groove formed on the outer side of the mounting shell.

[0012] Preferably, the second rotating shaft passes through the connecting plate, the fixing sleeve and the knob, the clamp is sleeved on the outside of the second rotating shaft, and the rubber pad is in contact with the outside of the second rotating shaft.

[0013] Preferably, the extrusion ramp and the avoidance ramp are extruded and fitted together.

[0014] Preferably, the first card block slides in contact with the inner wall of the cavity.

[0015] Preferably, the second locking block slides through the bottom end of the mounting shell and engages with the gear, and the top end of the second spring is fixedly connected to the inner top surface of the mounting shell.

[0016] Preferably, the push pin is slidably connected to the outer groove.

[0017] Compared with the prior art, the beneficial effects of this utility model are: the damping mechanism of the dental chair armrest device, with its knob damping adjustment mechanism, enables flexible resistance adjustment. Combined with modular quick-release rubber pads and a transverse groove-rack sliding structure, it allows for quick replacement and adjustment of the horizontal position and angle of the armrest, significantly improving patient fit and maintenance convenience. The specific details are as follows:

[0018] 1. Employing a single-knob damping adjustment mechanism, the knob engages with the inclined surface of the clamp to achieve flexible resistance adjustment, significantly simplifying the cumbersome operation of traditional multi-screw adjustments. The rubber pad is bonded and located on the outside of the device, facilitating easy replacement and modular maintenance. Combined with the sliding engagement structure of the transverse groove and rack, it enables two-dimensional adjustment of the handrail's horizontal position and angle, perfectly solving the problems of inconvenient adjustment and difficult maintenance in existing technologies. This allows the handrail to quickly adapt to the lifting needs of different patients and postures.

[0019] 2. Angle adjustment can be quickly completed by flicking the lever, and the second spring provides sufficient preload force, avoiding the risk of accidental displacement during surgery as with traditional structures, and providing medical staff with a more reliable operating experience. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the front cross-section structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the jacket structure;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the moving block;

[0024] Figure 5 This is a top view cross-sectional structural diagram of the present invention.

[0025] In the diagram: 1. Multi-position telescopic rod; 101. First pivot; 2. Handrail assembly; 201. Second pivot; 202. Connecting plate; 203. Moving block; 204. Hand support; 205. Fixing sleeve; 206. Knob; 207. Clip; 2071. Extrusion slope; 208. Rubber pad; 209. Horizontal groove; 210. Rack; 211. Cavity; 212. First spring; 213. First locking block; 3. Fixed angle assembly; 301. Mounting shell; 302. Gear; 303. Moving block; 304. Second locking block; 305. Pulley; 306. Second spring; 307. Outer groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-5 The present invention provides a technical solution: a damping mechanism for a dental chair armrest device, including a multi-position telescopic rod 1, the bottom end of which is rotatably connected to a first rotating shaft 101; the multi-position telescopic rod 1 is made of aluminum alloy, which has the characteristics of being lightweight and high-strength, and can realize multi-level adjustment of armrest height and automatically lock the position.

[0028] The top of the multi-position telescopic rod 1 is equipped with a handrail assembly 2, and the bottom of the multi-position telescopic rod 1 is equipped with a fixed angle assembly 3; this split design makes the angle adjustment and height adjustment functions of the handrail independent of each other and do not interfere with each other.

[0029] The handle assembly 2 includes a second rotating shaft 201 rotatably mounted on the top of the multi-stage telescopic rod 1. A connecting plate 202 is rotatably connected to the second rotating shaft 201. A movable block 203 is fixedly connected to the top of the connecting plate 202. A hand rest 204 is positioned above the movable block 203. A fixing sleeve 205 is bolted to one side of the connecting plate 202. A knob 206 is threaded to the end of the fixing sleeve 205. A clamping sleeve 207 is fixedly connected inside the fixing sleeve 205. A rubber pad 208 is adhered to the inner side of the clamping sleeve 207. A pressing slope 2071 is formed on the outer side of the clamping sleeve 207 near the knob 206, and a clearance slope is formed on the inner side of the knob 206 near the clamping sleeve 207. By rotating the knob 206, the pressing force on the clamping sleeve 207 can be changed, thereby adjusting the friction between the rubber pad 208 and the second rotating shaft 201, achieving stepless adjustment of the damping force. Compared with the traditional O-ring structure, this design has the advantages of a larger adjustment range and higher precision.

[0030] The hand support 204 has a horizontal groove 209 at its bottom. A movable block 203 is slidably connected to the horizontal groove 209. A cavity 211 is formed in the middle of the movable block 203. A first spring 212 is symmetrically fixedly connected to the cavity 211. A first locking block 213 is fixedly connected to the top of the first spring 212. A rack 210 is fixedly connected to the inner top surface of the horizontal groove 209. The first locking block 213 is engaged with the rack 210. When it is necessary to adjust the horizontal position of the hand support 204, only a certain external force needs to be applied to disengage the first locking block 213 from the rack 210. After moving into position, it automatically resets and locks under the action of the first spring 212. The operation is simple and reliable.

[0031] The fixed-angle assembly 3 includes a mounting shell 301 fixed to the outer side of the bottom of the multi-position telescopic rod 1. A gear 302 is fixedly connected to the outside of the first rotating shaft 101. A movable block 303 is slidably mounted inside the mounting shell 301. A second locking block 304 is fixedly connected to the bottom end of the movable block 303. A second spring 306 is fixedly connected to the top end of the movable block 303. A shift pin 305 is fixedly connected to the outside of the movable block 303. An outer groove 307 is provided on the outer side of the mounting shell 301. When it is necessary to adjust the angle of the armrest, simply move the shift pin 305 to disengage the second locking block 304 from the gear 302. After adjustment, release the shift pin 305, and the armrest will automatically reset and lock under the action of the second spring 306.

[0032] The second rotating shaft 201 passes through the connecting plate 202, the fixing sleeve 205, and the knob 206. The clamp 207 is fitted onto the outside of the second rotating shaft 201, and the rubber pad 208 is in contact with the outside of the second rotating shaft 201. This coaxial design ensures stability during rotation. The rubber pad 208 is made of wear-resistant silicone material and has a service life of more than 5 years. It can be removed with a shovel for replacement.

[0033] The extrusion bevel 2071 is pressed and fitted against the clearance bevel. The bevel angle is designed to be 45°, which can generate a large radial clamping force within a small knob adjustment stroke, improving adjustment sensitivity.

[0034] The first locking block 213 slides against the inner wall of the cavity 211. The cavity 211 is provided with a guide groove to ensure that the first locking block 213 can only move vertically and prevent it from tilting and getting stuck.

[0035] The second locking block 304 slides through the bottom end of the mounting shell 301 and engages with the gear 302. The top end of the second spring 306 is fixedly connected to the inner top surface of the mounting shell 301. The second spring 306 is made of stainless steel, and the preload ensures a reliable locking effect.

[0036] The push pin 305 is slidably connected to the outer groove 307. The travel limit of the outer groove 307 ensures that the second locking block 304 can be completely disengaged from the gear 302, while preventing overstretching of the second spring 306.

[0037] Working principle: Before using the damping mechanism of this dental chair armrest device, it is necessary to check the overall condition of the device to ensure it can function properly. Figure 1 - Figure 5 As shown, rotating the knob 206 changes the distance the knob 206 extends into the sleeve 207, thereby changing the pressure exerted by the recessed slope of the knob 206 on the compression slope 2071. When the knob 206 moves into the sleeve 207, the recessed slope compresses the compression slope 2071, forcing the sleeve 207 to contract towards the center and changing the pressure exerted by the multiple rubber pads 208 on the second rotating shaft 201. Ultimately, this changes the damping of the second rotating shaft 201 during rotation, preventing the hand support 204 from rotating arbitrarily, but applying external force can still directly change the angle of the hand support 204.

[0038] When the rubber pad 208 wears out due to long-term use, the bolts of the fixing sleeve 205 can be removed, and the second rotating shaft 201 can be pulled out from the fixing sleeve 205. Then, the knob 206 can be rotated and removed, and the glued rubber pad 208 can be replaced directly with tools, making maintenance very convenient.

[0039] The arm support 204 is used to support the arm while the patient is seated. When the patient lies down, the arm support 204 can be pulled horizontally. At this time, the horizontal groove 209 will compress the first locking block 213, causing the first locking block 213 to move vertically up and down within the cavity 211. The first spring 212 pushes the first locking block 213 back to its original position and re-engages with the rack 210, ultimately achieving the position adjustment of the arm support 204 and always providing effective support for the patient's arm. Combined with the retractable, self-locking, and rotating multi-position telescopic rod 1, the adjustable range of the arm support 204 is further expanded.

[0040] When the orientation of the multi-position telescopic rod 1 needs to be adjusted, the shift pin 305 slides within the outer groove 307, causing the second locking block 304 to disengage from the gear 302. At this time, the multi-position telescopic rod 1 can drive the mounting housing 301 to rotate around the first rotating shaft 101. After releasing the shift pin 305, the second spring 306 will push the movable block 303 to reset, causing the second locking block 304 to re-engage with the gear 302, achieving quick locking.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A damping mechanism for a dental chair armrest device, comprising a multi-position telescopic rod (1), wherein the bottom end of the multi-position telescopic rod (1) is rotatably connected to a first rotating shaft (101); characterized in that Also includes: The top of the multi-stage telescopic rod (1) is provided with a handle assembly (2), and the bottom of the multi-stage telescopic rod (1) is provided with a fixed angle assembly (3). The handle assembly (2) includes a second rotating shaft (201) rotatably mounted on the top of the multi-stage telescopic rod (1). The second rotating shaft (201) is rotatably connected to a connecting plate (202). A moving block (203) is fixedly connected to the top of the connecting plate (202). A hand support (204) is provided above the moving block (203). A fixing sleeve (205) is bolted to one side of the connecting plate (202). A knob (206) is threaded to the end of the fixing sleeve (205). A clip (207) is fixedly connected inside the fixing sleeve (205). A rubber pad (208) is adhered to the inner side of the clip (207). A pressing slope (2071) is provided on the outer side of the clip (207) near the knob (206). A clearance slope is provided on the inner side of the knob (206) near the clip (207). The hand support (204) has a horizontal groove (209) at its bottom. The moving block (203) is slidably connected to the horizontal groove (209). The moving block (203) has a cavity (211) in its middle. A first spring (212) is symmetrically fixedly connected to the cavity (211). A first locking block (213) is fixedly connected to the top of the first spring (212). A rack (210) is fixedly connected to the inner top surface of the horizontal groove (209). The first locking block (213) is engaged with the rack (210).

2. A damping mechanism for a dental chair armrest assembly as defined in claim 1, wherein: The fixed angle assembly (3) includes a mounting shell (301) fixed to the outer side of the bottom of the multi-stage telescopic rod (1), a gear (302) fixedly connected to the outside of the first rotating shaft (101), a movable block (303) slidably installed inside the mounting shell (301), a second locking block (304) fixedly connected to the bottom end of the movable block (303), a second spring (306) fixedly connected to the top end of the movable block (303), a lever (305) fixedly connected to the outside of the movable block (303), and an outer groove (307) opened on the outside of the mounting shell (301).

3. The damping mechanism of a dental chair armrest device according to claim 1, wherein: The second rotating shaft (201) passes through the connecting plate (202), the fixing sleeve (205) and the knob (206). The clip (207) is sleeved on the outside of the second rotating shaft (201), and the rubber pad (208) is in contact with the outside of the second rotating shaft (201).

4. The damping mechanism of a dental chair armrest device according to claim 1, wherein: The extrusion slope (2071) is extruded and adhered to the avoidance slope.

5. The damping mechanism of a dental chair armrest device according to claim 1, wherein: The first card block (213) slides against the inner wall of the cavity (211).

6. A damping mechanism for a dental chair armrest assembly as defined in claim 2 wherein: The second locking block (304) slides through the bottom end of the mounting shell (301) and engages with the gear (302), and the top end of the second spring (306) is fixedly connected to the inner top surface of the mounting shell (301).

7. A damping mechanism for a dental chair armrest assembly as defined in claim 2 wherein: The dial column (305) and the outer groove (307) are in sliding connection.

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