Machine needle locking mechanism and dental handpiece

Abstract

The utility model discloses a bur locking mechanism and a dental handpiece. The bur locking mechanism comprises an outer shaft tube, a movable sleeve, a bur and an elastic piece, and a conical clamping channel is formed in the outer shaft tube; the movable sleeve is slidably sleeved with the outer shaft pipe, a plurality of through holes are annularly and evenly distributed in the outer circumferential wall of the movable sleeve, clamping blocks are movably arranged in the through holes, and the outer sides of the clamping blocks abut against the inner circumferential wall of the clamping channel; the machine needle is inserted into the movable sleeve; the elastic piece acts between the movable sleeve and the outer shaft tube in the axial direction and is used for providing axial elastic force for the movable sleeve, so that the clamping channel pushes the clamping blocks to move inwards in the through hole, and the multiple clamping blocks clamp the machine needle. According to the utility model, the plurality of clamping blocks are matched with the conical clamping channel, so that the transverse movement of the plurality of clamping blocks is realized, the clamping of the machine needle is realized, the disassembly and assembly of the machine needle are more convenient, the clamping effect is better, and the clamping phenomenon is not easy to occur.

Description

Technical Field

[0001] The utility model relates to the technical field of dental treatment equipment, and particularly relates to a drill bit locking mechanism and a dental handpiece. Background Art

[0002] A dental handpiece is a high-speed rotating cutting medical device driven by air flow, which is mainly used for cutting tooth bodies, preparing tooth cavities, preparing tooth shapes and trimming tooth shapes, etc. Different types of drill bits need to be replaced for different uses of the dental handpiece. At present, the replacement methods of the drill bits of the dental handpiece are mainly divided into rotary type and press type. Among them, the rotary type can effectively clamp the drill bit during the loading and unloading process, but the replacement operation process is complex. While the press type is simple and fast during the replacement process of the drill bit, but currently the press type directly uses a tapered sleeve to tightly hold the drill bit. In practice, due to the easy accumulation of water on the outer periphery of the drill bit, the clamping effect of the drill bit is not good, resulting in the phenomenon of drill bit detachment, and it is also easy to get stuck and difficult to remove. Content of the Utility Model

[0003] The purpose of the utility model is to provide a drill bit locking mechanism and a dental handpiece to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0004] The technical solution adopted to solve the above technical problems:

[0005] The utility model provides a drill bit locking mechanism, including:

[0006] An outer shaft tube with a tapered clamping channel inside;

[0007] A movable sleeve is slidably sleeved in the outer shaft tube. A plurality of through holes are annularly and evenly distributed on the outer peripheral wall of the movable sleeve. Clamping blocks are movably arranged in the through holes, and the outer sides of the clamping blocks are in contact with the inner peripheral wall of the clamping channel;

[0008] A drill bit is inserted into the movable sleeve;

[0009] An elastic member acts axially between the movable sleeve and the outer shaft tube. The elastic member is used to provide axial elastic force to the movable sleeve, so that the clamping channel pushes the clamping blocks to move inward in the through holes, so that the plurality of clamping blocks clamp the drill bit.

[0010] The beneficial effect of the utility model is:

[0011] When a dental burr needs to be installed, press the movable sleeve so that the elastic member is compressed, and then insert the dental burr into the movable sleeve. Release the movable sleeve. Under the action of the restoring elastic force of the elastic member, the movable sleeve is pushed. When the outer side of the clamping block abuts against the inner peripheral wall of the clamping channel, the tapered clamping channel laterally pushes the clamping block to move inward in the through hole, so that a plurality of clamping blocks clamp the dental burr. When the dental burr needs to be removed, press the movable sleeve so that the elastic member is compressed, and the clamping block is not subjected to the lateral force of the clamping channel. At this time, the dental burr can be easily pulled out. The utility model realizes the lateral movement of a plurality of clamping blocks through the cooperation of a plurality of clamping blocks and a tapered clamping channel, so as to realize the clamping of the dental burr. The disassembly and assembly of the dental burr are more convenient, the clamping effect is better, and the phenomenon of jamming is not easy to occur.

[0012] As a further improvement of the above technical solution, the clamping block is in a semi-spherical shape, and the outer side of the clamping block is a convex surface and a spherical surface.

[0013] In this solution, the clamping block is clamped to the inner wall of the clamping channel through the spherical surface, which can improve the smoothness of the relative sliding between the movable sleeve and the clamping channel.

[0014] As a further improvement of the above technical solution, the inner side of the clamping block is an arc-shaped concave surface.

[0015] In this solution, the clamping block contacts the outer peripheral wall of the dental burr through the arc-shaped concave surface. Generally, the dental burr is cylindrical, and the arc-shaped concave surface can more closely abut against the outer peripheral wall of the dental burr to improve the clamping effect.

[0016] As a further improvement of the above technical solution, an inner sleeve is detachably sleeved inside the outer shaft tube, and the clamping channel is arranged on the inner circumference of the inner sleeve.

[0017] For the convenience of processing, a tapered clamping channel is machined inside the inner sleeve. At the same time, the inner sleeve can be made of a material with good durability, which can reduce the production cost. During assembly, the processed inner sleeve is sleeved inside the outer shaft tube.

[0018] As a further improvement of the above technical solution, a first step is arranged on the inner circumference of the outer shaft tube, and a limiting sleeve is detachably arranged at one end of the outer shaft tube far from the insertion of the dental burr. The inner sleeve is arranged between the first step and the limiting sleeve.

[0019] In this solution, the inner sleeve is fixed by the clamping of the limiting sleeve and the first step. During assembly, the inner sleeve is pre-sleeved inside the outer shaft tube, and then the limiting sleeve is installed. At this time, the inner sleeve is clamped and fixed between the limiting sleeve and the first step.

[0020] As a further improvement of the above technical solution, a second step is arranged on the outer circumference of the movable sleeve, and the second step abuts against the inner end of the limiting sleeve.

[0021] In order to prevent the movable sleeve from falling off, the movable sleeve of the present invention contacts the inner end of the limiting sleeve through the second step to prevent the movable sleeve from falling out. In a natural state, without installing the needle, the elastic member pushes the movable sleeve, and the second step contacts the inner end of the limiting sleeve at this time.

[0022] As a further improvement of the above technical solution, the movable sleeve is provided with a pressing end that passes outward through the limiting sleeve.

[0023] When disassembling and assembling the needle, the pressing end is pressed to drive the movable sleeve to move inward.

[0024] As a further improvement of the above technical solution, the limiting sleeve is a nut sleeve threadedly sleeved in the outer shaft tube.

[0025] This solution uses a nut sleeve to fix the inner sleeve, which is easy to operate.

[0026] As a further improvement of the above technical solution, a third step is provided on the inner circumference of the outer shaft tube, and the elastic member is provided between the third step and the inner end of the movable sleeve.

[0027] In some embodiments, the clamp is spherical in shape.

[0028] As a further improvement of the above technical solution, the elastic member is a spring sleeved inside the outer shaft tube.

[0029] The utility model also provides a dental mobile phone, comprising the needle locking mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0031] Figure 1 This is a cross-sectional view of an embodiment of the needle locking mechanism provided by the utility model;

[0032] Figure 2 This is an exploded view of an embodiment of the needle locking mechanism provided by the utility model. DETAILED DESCRIPTION

[0033] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0034] In the description of the present utility model, it should be understood that when it comes to orientation descriptions, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0035] In the description of the present utility model, if there are vocabulary descriptions such as "a number of", its meaning is one or more, and the meaning of multiple is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the base number, and understandings such as above, below, within, etc. include the base number.

[0036] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0037] Referring to Figures 1 to 2 , the following embodiments are made for the drill bit locking mechanism of the present utility model:

[0038] As Figure 1 and Figure 2 shown, the drill bit locking mechanism of the present utility model includes an outer shaft tube 100, a movable sleeve 200, a drill bit 300, and an elastic member 400.

[0039] The outer shaft tube 100 of this embodiment is a hollow structure. For the convenience of elaborating on the positional relationship between various components, as Figure 1 shown, the outer shaft tube 100 of this embodiment extends vertically. In some other embodiments, according to the installation requirements, the outer shaft tube 100 can extend in other directions. This embodiment takes the outer shaft tube 100 extending vertically as an example for elaboration.

[0040] A clamping channel 110 is arranged inside the outer shaft tube 100 of this embodiment, and the inner diameter of the clamping channel 110 is gradually reduced from bottom to top. It can be understood that the clamping channel 110 is a conical channel structure. In some other embodiments, according to the installation requirements, the inner diameter of the clamping channel 110 can be gradually increased from bottom to top.

[0041] The movable sleeve 200 of this embodiment is slidably installed along the axial direction inside the outer shaft tube 100. A plurality of through holes 210 are arranged on the outer peripheral wall of the movable sleeve 200. The plurality of through holes 210 are arranged at annular intervals. The through holes 210 extend horizontally. The through holes 210 penetrate the inner side and the outer side of the movable sleeve 200. Each through hole 210 is provided with a clamping block 211. The clamping block 211 can slide horizontally along the through hole 210. In some other embodiments, the through holes 210 can be inclined horizontally.

[0042] The outer end of the clamping block 211 in this embodiment abuts against the inner peripheral wall of the clamping channel 110. When the movable sleeve 200 slides axially within the outer shaft tube 100, the clamping block 211 can move along with the movable sleeve 200. Under the abutment of the clamping block 211 against the clamping channel 110 and under the guiding and pushing of the clamping channel 110, the clamping block 211 is driven to move inward along the through hole 210.

[0043] The bur 300 is inserted into the movable sleeve 200. The inner side of the clamping block 211 can abut against the outer peripheral wall of the bur 300. When the movable sleeve 200 moves axially, the clamping channel 110 pushes the clamping block 211 to move inward along the through hole 210, so that the inner side of the clamping block 211 abuts against the outer peripheral wall of the bur 300. Under the clamping action of multiple clamping blocks 211, the clamping of the bur 300 is achieved.

[0044] The elastic member 400 acts axially between the movable sleeve 200 and the outer shaft tube 100. The elastic member 400 is used to provide an axial elastic force to the movable sleeve 200, so that the clamping channel 110 pushes the clamping block 211 to move inward within the through hole 210 to drive multiple clamping blocks 211 to clamp the bur 300. It can be understood that after the bur 300 is inserted into the movable sleeve 200, the movable sleeve 200 moves within the clamping channel 110 under the driving of the elastic force of the elastic member 400. At this time, the clamping channel 110 pushes the clamping block 211 to move inward along the through hole 210. Under the clamping action of multiple clamping blocks 211, the clamping of the bur 300 is achieved.

[0045] The elastic member 400 in this embodiment provides an upward axial elastic force to the movable sleeve 200. The bur 300 is inserted into the movable sleeve 200 from bottom to top. The upper end of the movable sleeve 200 is provided with a pressing end 220 extending outside the upper end of the outer shaft tube 100.

[0046] When the bur 300 needs to be installed, press down the pressing end 220 to drive the movable sleeve 200 to move downward, so that the elastic member 400 is compressed. Then insert the bur 300 into the movable sleeve 200 from bottom to top. Release the pressing end 220. Under the restoring elastic force of the elastic member 400, the movable sleeve 200 is pushed upward. When the outer side of the clamping block 211 abuts against the inner peripheral wall of the clamping channel 110, the conical clamping channel 110 laterally pushes the clamping block 211 to move inward in the through hole 210, so that the plurality of clamping blocks 211 clamp the bur 300. When the bur 300 needs to be removed, press down the pressing end 220, so that the elastic member 400 is compressed and the clamping block 211 is not subjected to the lateral force of the clamping channel 110. At this time, the bur 300 can be easily pulled out. By matching the plurality of clamping blocks 211 with the conical clamping channel 110, the present utility model realizes the lateral movement of the plurality of clamping blocks 211 to clamp the bur 300, which is more convenient for the disassembly and assembly of the bur 300, has a better clamping effect, and is not prone to jamming phenomenon.

[0047] Regarding the structure of the clamping block 211, in some embodiments, the clamping block 211 is set to a semi-spherical shape, the outer side of the clamping block 211 is a convex surface and is a spherical surface, and the clamping block 211 is clamped with the inner wall of the clamping channel 110 through the spherical surface, which can improve the smoothness of the relative sliding between the movable sleeve 200 and the clamping channel 110.

[0048] In addition, the inner side of the clamping block 211 is set to an arc-shaped concave surface, and the clamping block 211 contacts the outer peripheral wall of the bur 300 through the arc-shaped concave surface. Generally, the bur 300 is cylindrical, and the arc-shaped concave surface can abut against the outer peripheral wall of the bur 300 more closely to improve the clamping effect.

[0049] In some other embodiments, the clamping block 211 can be set to a spherical shape, and a plurality of limiting grooves are provided on the outer periphery of the upper end of the bur 300, and the plurality of clamping blocks 211 are respectively clamped in the plurality of limiting grooves to improve the firmness of the installation of the bur 300.

[0050] Regarding the formation of the clamping channel 110, in some embodiments, the clamping channel 110 can be integrally formed with the outer shaft tube 100, but this is not convenient for assembly. In order to improve the assembly efficiency in this embodiment, an inner sleeve 500 is provided in the outer shaft tube 100, the clamping channel 110 is formed on the inner periphery of the inner sleeve 500, and the inner sleeve 500 is detachably arranged with the outer shaft tube 100, which is also convenient for processing. A conical clamping channel 110 is machined and formed in the inner sleeve 500. At the same time, the inner sleeve 500 can be made of a material with good durability, which can reduce the production cost. During assembly, the processed inner sleeve 500 is sleeved in the outer shaft tube 100.

[0051] For the installation of the inner sleeve 500, in this embodiment, a first step 120 is provided on the inner circumference of the outer shaft tube 100. The first step 120 is arranged upward. A limit sleeve 600 is detachably installed at the upper end of the outer shaft tube 100. The inner sleeve 500 is located between the first step 120 and the limit sleeve 600. During installation, the inner sleeve 500 is inserted into the outer shaft tube 100 from top to bottom. The lower end of the inner sleeve 500 abuts against the first step 120, and then the limit sleeve 600 is installed.

[0052] In this embodiment, the inner sleeve 500 is fixed by the clamping of the limit sleeve 600 and the first step 120. During assembly, the inner sleeve 500 is pre - sleeved into the outer shaft tube 100, and then the limit sleeve 600 is installed. At this time, the inner sleeve 500 is clamped and fixed between the limit sleeve 600 and the first step 120.

[0053] To prevent the movable sleeve 200 from falling off, a second step 230 is provided on the outer circumference of the movable sleeve 200 in this embodiment. The second step 230 is arranged upward. The second step 230 abuts against the bottom end of the limit sleeve 600. The movable sleeve 200 abuts against the inner end of the limit sleeve 600 through the second step 230 to prevent the movable sleeve 200 from coming out. In the natural state, without the needle 300 installed, the elastic member 400 pushes the movable sleeve 200 upward. At this time, the second step 230 abuts against the inner end of the limit sleeve 600.

[0054] The pressing end 220 passes through the limit sleeve 600 from bottom to top. When disassembling and assembling the needle 300, the pressing end 220 is pressed through a pressing operation to drive the movable sleeve 200 to move inward.

[0055] In this embodiment, the limit sleeve 600 is a nut sleeve. The outer circumference of the nut sleeve is provided with an external thread. The limit sleeve 600 is threadedly sleeved inside the upper end of the outer shaft tube 100. The inner sleeve 500 is fixed by the nut sleeve, and the operation is convenient.

[0056] Further, a third step 130 is provided on the inner circumference of the outer shaft tube 100 in this embodiment. The third step 130 is arranged upward. The elastic member 400 is located between the third step 130 and the lower end of the movable sleeve 200.

[0057] During assembly, the elastic member 400 is pre - sleeved into the outer shaft tube 100 from top to bottom. The lower end of the elastic member 400 abuts against the third step 130. Then the movable sleeve 200 is sleeved into the outer shaft tube 100 from top to bottom. The lower end of the movable sleeve 200 abuts against the upper end of the elastic member 400. Then the inner sleeve 500 is sleeved into the outer shaft tube 100 from top to bottom. Finally, the limit sleeve 600 is installed, and the clamping block 211 is pre - installed in the through - hole 210.

[0058] In this embodiment, the elastic member 400 is a spring, and the spring is sleeved inside the outer shaft tube 100.

[0059] The present utility model further provides a dental handpiece, which includes the above-mentioned bur locking mechanism. The dental handpiece has all the beneficial effects of the bur locking mechanism, and will not be elaborated here one by one.

[0060] The above has specifically described the preferred embodiments of the present utility model, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present utility model, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A bur locking mechanism, characterized in that Comprising: An outer shaft tube (100) with a tapered clamping channel (110) provided inside; A movable sleeve (200) slidably sleeved inside the outer shaft tube (100). A plurality of through holes (210) are evenly distributed in a circular pattern on the outer peripheral wall of the movable sleeve (200). Clamping blocks (211) are movably arranged in the through holes (210), and the outer sides of the clamping blocks (211) are in contact with the inner peripheral wall of the clamping channel (110); A dental burr (300) inserted into the movable sleeve (200); An elastic member (400) acting axially between the movable sleeve (200) and the outer shaft tube (100). The elastic member (400) is used to provide an axial elastic force to the movable sleeve (200), so that the clamping channel (110) pushes the clamping blocks (211) to move inward in the through holes (210) to clamp the dental burr (300) with a plurality of the clamping blocks (211).

2. The dental burr locking mechanism according to claim 1, characterized in that: The clamping blocks (211) are in a semi-spherical shape, and the outer sides of the clamping blocks (211) are convex surfaces and spherical surfaces.

3. The dental burr locking mechanism according to claim 2, characterized in that: The inner sides of the clamping blocks (211) are arc-shaped concave surfaces.

4. The dental burr locking mechanism according to claim 1, characterized in that: An inner sleeve (500) is detachably sleeved inside the outer shaft tube (100), and the clamping channel (110) is provided on the inner periphery of the inner sleeve (500).

5. The dental burr locking mechanism according to claim 4, characterized in that: A first step (120) is provided on the inner periphery of the outer shaft tube (100). A limit sleeve (600) is detachably arranged at one end of the outer shaft tube (100) away from the insertion of the dental burr (300), and the inner sleeve (500) is arranged between the first step (120) and the limit sleeve (600).

6. The dental burr locking mechanism according to claim 5, characterized in that: A second step (230) is provided on the outer periphery of the movable sleeve (200), and the second step (230) abuts against the inner end of the limit sleeve (600).

7. The dental burr locking mechanism according to claim 5, characterized in that: The movable sleeve (200) is provided with a pressing end (220) passing outward through the limit sleeve (600).

8. The dental burr locking mechanism according to claim 5, characterized in that: The limit sleeve (600) is a nut sleeve threadedly sleeved inside the outer shaft tube (100).

9. The dental burr locking mechanism according to claim 1, characterized in that: A third step (130) is provided on the inner periphery of the outer shaft tube (100). The elastic member (400) is arranged between the third step (130) and the inner end of the movable sleeve (200). The elastic member (400) is a spring sleeved inside the outer shaft tube (100); The clamping blocks (211) are in a spherical shape.

10. A dental handpiece, characterized in that: Including the dental burr locking mechanism according to any one of claims 1 to 9.

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