Quickly detachable dental handpiece chucking structure

Abstract

The application discloses a detachable dental handpiece head locking structure. The application relates to the technical field of dental treatment instruments. The detachable dental handpiece head locking structure comprises a first clamping pin, a convex position, a spring, a fastening nut and a positioning nut. The head is connected with a transmission shaft through the first clamping pin. The convex position is fixed to one end of the outer wall of the transmission shaft. The spring, the fastening nut and the positioning nut are arranged in the housing from left to right. The housing is provided with a stepped hole. The inner wall of the housing is provided with a first U-shaped groove on the right side. The outer wall of the fastening nut is provided with a limiting pin and a spiral groove. The limiting pin slides in the first U-shaped groove. The convex position rotates on the right side of the inner wall of the housing and is rotatably arranged in the spiral groove in a matched mode. The spring is kept in a compressed state. The transmission shaft and the head are pulled tightly through the elastic force, so that the head is prevented from falling off due to vibration generated during work of the handpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dental treatment instruments, in particular to a quick-release dental handpiece head locking structure. BACKGROUND

[0002] Low-speed dental handpieces are commonly used in various dental treatment conditions, and the handpiece head that contacts the oral cavity needs to be disinfected, sterilized and maintained regularly. Therefore, the handpiece head assembly requires easy disassembly. At present, the common fixing methods for low-speed handpiece head assemblies are screw rod or screw fastening methods. These two methods have the following disadvantages: 1. The handpiece head can be disassembled only after the screw rod or screw is loosened, which is relatively troublesome; 2. These two methods are prone to thread slipping and failure due to frequent disassembly, resulting in a loss of locking ability of the handpiece head assembly; 3. Vibration of the handpiece can also affect these two locking methods, causing the handpiece head to loosen, and since the screw is located at the front of the handpiece handle, it is located in the patient's mouth during the operation. Once loosened, it may fall into the patient's body. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application provides a quick-release dental handpiece head locking structure that will not loosen due to vibration.

[0004] The present application adopts the following technical solution: a quick-release dental handpiece head locking structure is provided in the housing for locking the transmission shaft and the handpiece, and the transmission shaft and the housing, comprising a first pin, a protruding position, a spring, a tightening nut and a positioning nut; the spring and the tightening nut are movably arranged, and the positioning nut can be fixedly arranged in the housing by adhesion or interference fit;

[0005] The handpiece and the transmission shaft are connected by the first pin; after the first pin is connected, the handpiece and the transmission shaft will not produce axial displacement and will not be separated from each other;

[0006] The protruding position is fixedly arranged at one end of the outer wall of the transmission shaft, the spring, the tightening nut and the positioning nut are arranged in the housing from left to right, the housing is provided with a stepped hole with an increasing inner diameter from left to right, the right side of the inner wall of the housing is provided with a first U-shaped groove extending along the axis, the outer wall of the tightening nut is provided with a limiting pin and a spiral groove, the limiting pin slides in the first U-shaped groove, the protruding position rotates in the right side of the inner wall of the housing and is rotatably arranged in the spiral groove, the positioning nut is fixedly arranged on the right side of the inner wall of the housing, and the spring is in a compressed state.

[0007] In the above technical solution, the spring is always in a compressed state and can always provide a pushing force to the tightening nut, so that the tightening nut can maintain a tensioning force on the transmission shaft, and the handpiece head can be pulled and locked on the left side of the housing.

[0008] The preferred embodiment of the present application is characterized in that the handpiece is provided with an axial inner hole and at least one radial first pin hole, the other end of the transmission shaft is provided with a second pin hole corresponding to the first pin hole, and the other end of the transmission shaft is inserted into the inner hole and the first pin is inserted into the aligned first pin hole and second pin hole.

[0009] In the above technical solution, after the transmission shaft is inserted into the inner hole, the first pin is inserted into the aligned first pin hole and second pin hole, thereby realizing the connection of the transmission shaft and the handpiece.

[0010] The preferred embodiment of the present application is characterized in that the handpiece is provided with a first step position, the other end of the transmission shaft is provided with a second step position, the first pin hole is located on the first step position, and the C-shaped elastic sleeve is arranged on the first step position, abutting against the first pin and contacting the end surface of the second step position.

[0011] In the above technical solution, the C-shaped elastic sleeve is used to limit the first pin, preventing the first pin from being separated from the first pin hole and the second pin hole during use, thereby ensuring the connection reliability of the handpiece and the transmission shaft.

[0012] The preferred embodiment of the present application is characterized in that the maximum outer diameter of the second step position is not less than the maximum outer diameter of the C-shaped elastic sleeve.

[0013] In the above technical solution, the size of the C-shaped elastic sleeve is limited, ensuring that the C-shaped elastic sleeve can limit the first pin while the C-shaped elastic sleeve itself cannot be axially displaced under the influence of the vibration of the bending handpiece, thereby further improving the connection reliability.

[0014] The preferred embodiment of the present application is characterized in that the left side of the inner wall of the shell is provided with an axially extending second U-shaped groove, one end of the second U-shaped groove is in communication with the left end surface of the shell, the other end is in communication with the joint end surface of the step hole, and the protruding position is slid into the shell through the second U-shaped groove.

[0015] In the above technical solution, the second U-shaped groove is provided to provide space for the movement of the protruding position, and the overall size of the shell can also be avoided.

[0016] The preferred embodiment of the present application is characterized in that one end of the first U-shaped groove is in communication with the joint end surface of the step hole, the other end is in communication with the right end surface of the shell, and the fixed nut is slid into the shell through the first U-shaped groove.

[0017] In the above technical solution, the first U-shaped groove is provided to provide space for the movement of the limiting pin while preventing the fixed nut from rotating in the shell.

[0018] The preferred embodiment of the present application is characterized in that the outer diameter of the spring is greater than the inner diameter of the left part of the step hole.

[0019] In the technical solution, the spring is limited in the right side of the inside of the shell, and can generate a certain amount of return while always being compressed, so as to provide sufficient elastic tension for the transmission shaft, and lock the head on the shell.

[0020] The preferred embodiment of the application is that the head is further provided with at least one third pin hole in the axial direction, the left end surface of the shell is provided with a fourth pin hole corresponding to the third pin hole, and the second locking pin is inserted between the bottom of the third pin hole and the bottom of the fourth pin hole.

[0021] In the technical solution, one end of the second locking pin is located in the third pin hole, and the other end of the second locking pin is located in the fourth pin hole, so that the rotation of the head can be reliably prevented, and the connection reliability is further improved.

[0022] The preferred embodiment of the application is that the protruding bit is integrally formed with the transmission shaft or is inserted on the transmission shaft, and the number of the second U-shaped grooves is consistent with the number of the protruding bits.

[0023] In the technical solution, the protruding bit can move in the second U-shaped groove one by one.

[0024] The preferred embodiment of the application is that one end of the spiral groove is in communication with the left end surface of the fastening nut, the other end of the spiral groove is close to the right end surface of the positioning nut, and the limiting pin is located outside the spiral groove.

[0025] In the technical solution, the protruding bit can be rotated into one end of the spiral groove and be limited in the other end of the spiral groove, so as to further compress the spring, and thus sufficient elastic force can be used for fastening the head after the head is loosened.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] 1. The protruding bit is rotated into the fastening nut, the displacement of the fastening nut and the further compression of the spring are realized, the return of the spring drives the axial displacement of the transmission shaft and the head, the head is tightly attached to the shell, the reliable fixation of the head is realized, the reverse operation is performed to realize the purpose of quick disassembly, the transmission shaft and the head are pulled tightly by the elastic force, and the head is prevented from falling off due to the vibration caused by the bending of the mobile phone.

[0028] 2. In the process that the head is attached to the shell, the third pin hole on the head is sleeved with the second locking pin, the connection reliability of the head and the shell is further improved, and the rotation of the head after being locked is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is an engineering assembly drawing of the application;

[0030] Figure 2 is the schematic diagram of explosion of the present application Figure One ;

[0031] Figure 3 is the schematic diagram of explosion of the present application Figure Two ;

[0032] Figure 4 is the schematic diagram of the structure of the fixing nut

[0033] Figure 5 is the schematic diagram of the structure of the shell

[0034] In the figure: 1, shell; 11, stepped hole; 12, first U-shaped groove; 13, second U-shaped groove; 14, fourth pin hole

[0035] 2, transmission shaft; 21, protruding position; 22, second pin hole; 23, second stepped position

[0036] 3, handpiece; 31, inner hole; 32, first pin hole; 33, first stepped position; 34, third pin hole

[0037] 41, first pin; 42, spring; 43, fixing nut; 431, limiting pin; 432, helical groove; 44, positioning nut; 45, C-shaped elastic buckle; 46, second pin DETAILED DESCRIPTION

[0038] In the following, the present application is further described in conjunction with the drawings and the specific embodiments. It should be noted that the following described embodiments or technical features can be combined in any manner to form new embodiments, and the up, down, left, right, front, back, inner, and outer directions appearing in the text or about to appear are based on the drawings of the present application, and are not specific limitations of the present application.

[0039] As shown in Figures 1-5 , a quick detachable dental bending handpiece locking structure is arranged in a shell 1 and used for locking a transmission shaft 2 and a handpiece 3 and the transmission shaft 2 and the shell 1, and includes a first pin 41, a protruding position 21, a spring 42, a fixing nut 43, and a positioning nut 44.

[0040] The handpiece 3 and the transmission shaft 2 are connected through the first pin 41; the axial separation between the handpiece 3 and the transmission shaft 2 is prevented, and the connection reliability is ensured.

[0041] The convex bit 21 is fixedly arranged at one end of the outer wall of the transmission shaft 2, the spring 42, the fastening nut 43 and the positioning nut 44 are arranged in the housing 1 from left to right in sequence, the housing 1 is provided with a stepped hole 11 with an increasing inner diameter from left to right, the right side of the inner wall of the housing 1 is provided with a first U-shaped groove 12 extending along the axis, the outer wall of the fastening nut 43 is provided with a limiting pin 431 and a helical groove 432, the limiting pin 431 slides in the first U-shaped groove 12, the convex bit 21 rotates at the right side of the inner part of the housing 1 and is rotatably arranged in the helical groove 432, the positioning nut 44 is fixedly arranged at the right side of the inner wall of the housing 1, and the spring 42 is kept in a compressed state. After the connection of the head 3 and the transmission shaft 2 is completed, one end of the transmission shaft 2 is inserted into the housing 1, when the convex bit 21 is displaced from the left side of the inner part of the housing 1 to the right side of the inner part of the housing 1 along with the transmission shaft 2, the convex bit 21 contacts the left end surface of the fastening nut 43, at this time, the head 3 and the transmission shaft 2 as a whole are rotated to drive the convex bit 21 to rotate, so that one end of the helical groove 432 (i.e. the front end of the helical groove 432) of the convex bit 21 is rotated into the helical groove 432, in the process of rotating the convex bit 21 to the other end of the helical groove 432 (i.e. the bottom end of the helical groove 432), the distance between the housing 1 and the head 3 is kept unchanged, the rotation of the transmission shaft 2 will pull the fastening nut 43 to produce horizontal displacement close to the head 3, so that the spring 42 is in a further compressed state, after the locking of the convex bit 21 is completed, the head 3 is released, under the elastic force of the spring 42, the transmission shaft 2 is completely inserted into the housing 1, the head 3 is tightly attached to the housing 1, and the locking of the head 3 and the transmission shaft 2 is realized; under the limiting action of the first U-shaped groove 12, the limiting pin 431 and the fastening nut 43 can only produce axial movement in the housing 1 and cannot rotate, so that the convex bit 21 can be reliably rotated into the helical groove 432 and drive the fastening nut 43 to produce displacement and further compress the spring 42; the positioning nut 44 is fixedly arranged, so that the spring 42 is in a compressed state at the beginning, the tensioning effect of the elastic force of the spring 42 is ensured, and the head 3 is always tightly locked with the housing 1.

[0042] The head 3 is provided with an axial inner hole 31 and at least one radial first pin hole 32, the other end of the transmission shaft 2 is provided with a second pin hole 22 corresponding to the first pin hole 32 one by one, the other end of the transmission shaft 2 is inserted into the inner hole 31, and the first pin 41 is inserted into the coincided first pin hole 32 and second pin hole 22. The other end of the transmission shaft 2 is inserted into the inner hole 31 matched therewith, the head 3 or the transmission shaft 2 is rotated, so that the first pin hole 32 coincides with the second pin hole 22 (i.e. the axes of the two coincide), and then the first pin 41 is inserted, so that the connection of the head 3 and the transmission shaft 2 is realized.

[0043] The head 3 is provided with a first step position 33, the other end of the transmission shaft 2 is provided with a second step position 23, the first pin hole 32 is located on the first step position 33, and the C-shaped elastic buckle 45 is sleeved on the first step position 33, abuts against the first pin 41 and is in contact with the end face of the second step position 23. The C-shaped elastic buckle 45 is annular and is provided with a gap, so that the C-shaped elastic buckle 45 can be opened around the gap. In this way, after the C-shaped elastic buckle 45 is opened, the C-shaped elastic buckle 45 can be clamped on the first step position 33, thereby preventing the first pin 41 from falling off and ensuring that the head 3 and the transmission shaft 2 are reliably locked.

[0044] The maximum outer diameter of the second step position 23 is not less than the maximum outer diameter of the C-shaped elastic buckle 45. The outer diameter of the first step surface is smaller than the outer diameter of the second step surface, so that after the C-shaped elastic buckle 45 is sleeved on the first step surface, the second step surface can prevent the C-shaped elastic buckle 45 from moving axially, thereby ensuring that the shielding and limiting effect of the C-shaped elastic buckle 45 on the first pin 41 is reliable.

[0045] The inner wall left side of the shell 1 is provided with a second U-shaped groove 13 extending in the axial direction, one end of the second U-shaped groove 13 is in communication with the left end face of the shell 1, the other end is in communication with the joint end face of the step hole 11, and the protruding position 21 slides into the shell 1 through the second U-shaped groove 13. Through the arrangement of the second U-shaped groove 13, the protruding position 21 can slide in the second U-shaped groove 13 of the shell 1 and move to the right side of the inner wall of the shell 1 while the outer wall of the transmission shaft 2 and the left side of the inner wall of the shell 1 are adapted, so that the overall volume of the shell 1 is more compact; the left side inner diameter of the step hole 11 is smaller than the right side inner diameter of the step hole 11, so that the spring 42, the clamping nut 43 and the positioning nut 44 can be limited to the right side of the inside of the shell 1, so that the spring 42 can be elastically compressed under the extrusion of the joint end face of the step hole 11 and the clamping nut 43.

[0046] One end of the first U-shaped groove 12 is in communication with the joint end face of the step hole 11, and the other end is in communication with the right end face of the shell 1. The clamping nut 43 slides into the shell 1 through the first U-shaped groove 12. After the clamping nut 43 slides into the shell 1, it is limited to the right side of the inside of the shell 1 by the spring 42 and the positioning nut 44 and generates axial displacement therein.

[0047] The outer diameter of the spring 42 is greater than the inner diameter of the left side of the step hole 11. That is, one end of the spring 42 is in contact with the clamping nut 43, and the other end is limited by the joint end face of the step hole 11, so that the spring 42 can be compressed by the movement of the clamping nut 43.

[0048] The machine head 3 is further provided with at least one axial third pin hole 34, the left end face of the shell 1 is provided with a fourth pin hole 14 corresponding to the third pin hole 34, and the bottom of the third pin hole 34 and the bottom of the fourth pin hole 14 are inserted with a second clamping pin. After the machine head 3 is locked with the transmission shaft 2 and before the protruding bit 21 is locked with the fastening nut 43, the second clamping pin is inserted into the fourth pin hole 14, and after the protruding bit 21 is locked with the fastening nut 43, the machine head 3 is loosened and moves towards the left end face of the shell 1, at this time, the third pin hole 34 is kept in alignment with the second clamping pin, after the spring 42 is reset for a stroke, the machine head 3 is tightly attached to the shell 1, the third pin hole 34 is sleeved into the second clamping pin, at this time, the spring 42 is still in a compressed state, and the machine head 3 and the shell 1 cannot rotate under the action of the second clamping pin, that is, the reliable locking of the machine head 3 is realized.

[0049] The protruding bit 21 is integrally formed with the transmission shaft 2 or is inserted on the transmission shaft 2, and the number of the second U-shaped grooves 13 is consistent with the number of the protruding bits 21. The protruding bit 21 can be integrally formed with the transmission shaft 2, or a hole is arranged on the transmission shaft 2, one end of the protruding bit 21 is inserted into the hole, and the other end is exposed, the number of the protruding bits 21 can be one or two, and preferably the number of the protruding bits 21 is two, so that the transmission shaft 2 and the fastening nut can keep a balanced state under the axial tension of the spring 42, and the number of the spiral grooves 432 is consistent with the number of the protruding bits 21, and one protruding bit 21 is screwed into one corresponding spiral groove 432.

[0050] One end of the spiral groove 432 is in communication with the left end face of the fastening nut 43, the other end of the spiral groove 432 is close to the right end face of the positioning nut 44, and the limiting pin 431 is located outside the spiral groove 432. The limiting pin 431 can be integrally formed with the fastening nut 43 or is inserted on the surface of the fastening nut 43 by means of hole opening; one end of the spiral groove 432 is in communication with the end face of the fastening nut 43, which facilitates the protruding bit 21 to enter the spiral groove 432 from the end face of the fastening nut 43 and transmit to the other end of the spiral groove 432, so that the spring 42 is further compressed and axial tension is provided, the protruding bit 21 is reliably clamped at the other end of the spiral groove 432, and the locking of the transmission shaft 2 is realized.

[0051] The locking principle of the application is as follows:

[0052] When locking, the head 3 is connected with the transmission shaft 2 by the first pin 41 and the C-shaped elastic sleeve is inserted, so that the head 3 and the transmission shaft 2 are tightly connected, the protruding part 21 of the transmission shaft 2 is inserted into the shell 1 through the second U-shaped groove 13, the transmission shaft 2 is rotated, so that the protruding part 21 is opposite to one end of the spiral groove 432, then the transmission shaft 2 is forwardly rotated, so that the protruding part 21 reaches the other end of the spiral groove, in the process, the fastening nut is separated from the positioning nut 44, the spring 42 is continuously compressed, the head 3 is not in contact with the second pin, the head 3 is twisted to the position and then is loosened, the spring 42 is returned, the third pin hole 34 of the head 3 is inserted into the second pin, so that the head 3 is reliably locked, at this time, the fastening nut 43 and the positioning nut 44 are still separated, the spring 42 is still in the compressed state, so that the spring 42 can provide sufficient tension.

[0053] When disassembling, the head 3 is pulled, so that the third pin hole 34 is separated from the second pin, the head 3 is reversely rotated, the protruding part 21 is rotated out of the fastening nut 43, the protruding part 21 is aligned with the second U-shaped groove 13, then the transmission shaft 2 is pulled out of the shell, the C-shaped elastic sleeve is separated, the first pin 41 is taken out, so that the head 3 on the transmission shaft 2 is disassembled.

[0054] The above embodiment is only a preferred embodiment of the application, and cannot be used to limit the protection scope of the application, any non-essential change and replacement made by the person skilled in the art on the basis of the application belongs to the protection scope of the application.

Claims

1. A quick detachable dental handpiece nosepiece locking structure, which is arranged in a housing (1) and is used for locking a transmission shaft (2) and a nosepiece (3) and locking the transmission shaft (2) and the housing (1), characterized in that, It comprises a first clamping pin (41), a protruding position (21), a spring (42), a fastening nut (43) and a positioning nut (44); The head (3) is connected with the transmission shaft (2) through the first clamping pin (41). The protruding position (21) is fixedly arranged at one end of the outer wall of the transmission shaft (2), the spring (42), the fastening nut (43) and the positioning nut (44) are arranged in the housing (1) from left to right in sequence, the housing (1) is provided with a stepped hole (11) with an increasing inner diameter from left to right, the right side of the inner wall of the housing (1) is provided with a first U-shaped groove (12) extending along the axis, the outer wall of the fastening nut (43) is provided with a limiting pin (431) and a helical groove (432), the limiting pin (431) slides in the first U-shaped groove (12), the protruding position (21) rotates at the right side of the inner wall of the housing (1) and is rotatably arranged in the helical groove (432), the positioning nut (44) is fixedly arranged at the right side of the inner wall of the housing (1), and the spring (42) is in a compressed state. One end of the helical groove (432) is in communication with the left end face of the fastening nut (43), the other end of the helical groove (432) is close to the right end face of the positioning nut (44), and the limiting pin (431) is located outside the helical groove (432).

2. The quick detachable handpiece lock structure of claim 1, wherein: The head (3) is provided with an axial inner hole (31) and at least one radial first pin hole (32), the other end of the transmission shaft (2) is provided with a second pin hole (22) corresponding to the first pin hole (32) one by one, the other end of the transmission shaft (2) is inserted into the inner hole (31), and the first clamping pin (41) is inserted into the coinciding first pin hole (32) and the second pin hole (22).

3. The quick detachable dental handpiece chuck locking structure according to claim 2, characterized in that: The head (3) is provided with a first stepped position (33), the other end of the transmission shaft (2) is provided with a second stepped position (23), the first pin hole (32) is located on the first stepped position (33), and the C-shaped elastic clamp (45) is sleeved on the first stepped position (33), abuts against the first clamping pin (41) and is in contact with the end face of the second stepped position (23).

4. The quick detachable dental handpiece chuck locking structure according to claim 3, characterized in that: The maximum outer diameter of the second stepped position (23) is not less than the maximum outer diameter of the C-shaped elastic clamp (45).

5. The quick detachable handpiece lock structure of claim 1, wherein: The left side of the inner wall of the housing (1) is provided with a second U-shaped groove (13) extending along the axis, one end of the second U-shaped groove (13) is in communication with the left end face of the housing (1), the other end is in communication with the connection end face of the stepped hole (11), and the protruding position (21) slides into the housing (1) through the second U-shaped groove (13).

6. The quick detachable handpiece lock structure of dental handpiece according to claim 1, characterized in that: One end of the first U-shaped groove (12) is in communication with the connection end face of the stepped hole (11), the other end is in communication with the right end face of the housing (1), and the fastening nut (43) slides into the housing (1) through the first U-shaped groove (12).

7. The quick detachable handpiece lock structure of dental contra-angle according to any one of claims 1-6, characterized in that: The outer diameter of the spring (42) is greater than the inner diameter of the left side portion of the stepped hole (11).

8. The quick detachable handpiece lock structure of dental handpiece according to claim 1, characterized in that: The head (3) is further provided with at least one axial third pin hole (34), and the left end face of the shell (1) is provided with a fourth pin hole (14) corresponding to the third pin hole (34), and a second clamping pin is inserted between the bottom of the third pin hole (34) and the bottom of the fourth pin hole (14).

9. The quick detachable dental handpiece chuck locking structure according to claim 5, characterized in that: The convex position (21) is integrally formed with the transmission shaft (2) or is inserted on the transmission shaft (2), and the number of the second U-shaped grooves (13) is consistent with the number of the convex positions (21).

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