Stepped hook rear-mounted bur clamping device for low-speed dental handpieces

Abstract

A step-shaped hook rear-mounted needle clamping device for a low-speed dental handpiece is provided. The two ends of the pull pin provided at the right end of the chuck rear shaft are passed through the long slot holes on the rotating shaft and extended into the long slot on the inner wall of the sliding sleeve. The right end of the step-shaped hook rear-mounted double-end clamping claw chuck is hooked and connected to the inner wall of the chuck rear shaft, and a limit platform is formed on the inner wall of the cavity. When the sliding sleeve moves left and right, the pull pin pushes or pulls the chuck rear shaft to move left or right, thereby clamping or releasing the needle at both ends of the step-shaped hook rear-mounted double-end clamping claw chuck. The present invention solves the problem of incomplete separation of the outer conical surface of the left end of the step-shaped hook rear-mounted double-end clamping claw chuck and the inner conical surface of the chuck front shaft, and is conducive to the separation of the tapered surface adapted to the chuck rear shaft of the step-shaped hook rear-mounted double-end clamping claw chuck and the chuck rear shaft. The clamping structure design is novel, the clamping force meets the needle clamping requirements, the needle clamping is convenient and quick to disassemble and replace, and the user experience is good.

Description

Technical Field

[0001] The invention belongs to the technical field of oral medical instruments, and in particular relates to a stepped hook rear-mounted bur clamping device for a dental low-speed handpiece. Background Art

[0002] A dental handpiece equipped with a low-speed needle drives the clamped needle to operate at a low speed through mechanical transmission. The needle speed is generally from several hundred to twenty thousand revolutions per minute. The speed is relatively low and the torque is large. It is suitable for drilling patients' diseased teeth or performing rough grinding, rough polishing and other treatment operations on stainless steel dentures. The needle clamping structure of a dental low-speed handpiece is an important component of a dental low-speed handpiece. At present, the needle clamping structure in the dental low-speed handpieces on the market is a single-end jaw chuck clamping structure. When the traditional single-end jaw clamps the needle, the clamping force is small and cannot meet the needle clamping requirements. In order to meet the needle clamping requirements, the clamping requires a large clamping spring force and clamping area, and it is very laborious to open the chuck. That is, when the clamping force increases, it is not conducive to the removal of the needle, and the user experience is not good. The use of a front-mounted needle clamping device with a chuck step-shaped hook for a dental low-speed handpiece can solve the above problems, but when replacing the needle, it is found that when the rear clamping force of the double-end jaw chuck is greater than the front clamping force, the clamping force of the double-end jaw chuck is greater than the front clamping force. When holding force, the conical surfaces at both ends of the double-end jaw chuck can be smoothly separated from the inner conical surfaces of the front shaft and the rear shaft of the chuck. However, when the rear clamping force of the double-end jaw chuck is less than the front clamping force, the rear end jaws of the double-end jaw chuck are fully opened, but the front end jaws. The stepped hook at the left end of the double-end jaw chuck is hooked and connected with the inner wall of the front shaft of the chuck, so that after the rear end of the double-end jaw is completely separated from the rear shaft of the chuck, the front end of the double-end jaw cannot be pulled to separate from the front shaft of the chuck. There is a phenomenon that the front end of the double-end jaw is not fully opened. This makes it necessary to insert the needle inward first when replacing the needle, separate the front end of the double-end jaw from the needle, and then pull out the needle outward, which is inconvenient for replacement. Therefore, it is necessary to improve the above defects. Summary of the Invention

[0003] The technical problem solved by the present invention is: to provide a stepped hook rear-mounted needle clamping device for a dental low-speed mobile phone, which solves the problem that the outer conical surface of the left end of the stepped hook rear-mounted double-end claw chuck is not completely separated from the inner conical surface of the chuck front shaft. The limit platform arranged on the inner wall of the cavity limits the rightward movement position of the stepped hook rear-mounted double-end claw chuck to prevent the left end of the stepped hook rear-mounted double-end claw chuck from being separated from the inner conical hole of the chuck front shaft. The clamping structure is novel in design, the clamping force meets the needle clamping requirements, the needle clamping is convenient and quick to disassemble and replace, and the user experience is good.

[0004] The technical solution adopted by the present invention is: a stepped hook rear-mounted needle clamping device for a dental low-speed mobile phone, comprising a rotating shaft and a sliding sleeve with a clearance fit on the rotating shaft, a clamping spring is installed in the cavity of the rotating shaft, and the left side of the clamping spring is provided with a chuck rear shaft that is clearance fit with the cavity, a stepped hook rear-mounted double-end clamping chuck and a chuck front shaft with the left end extending out of the cavity in sequence, the two ends of the pull pin provided at the right end of the chuck rear shaft pass through the long slot hole on the rotating shaft and extend into the long slot on the inner wall of the sliding sleeve, and the rotating shaft is provided with a sleeve located at the left end of the sliding sleeve and a fixed The spring between the step surfaces inside the sleeve, the outer conical surfaces on the left and right ends of the stepped hook rear-mounted double-end jaw chuck are respectively adapted to the inner conical surfaces of the chuck front shaft and the chuck rear shaft, the right end of the stepped hook rear-mounted double-end jaw chuck is hooked and connected to the inner wall of the chuck rear shaft, and a limit platform is formed on the inner wall of the cavity, the turning needle passes through the chuck front shaft and the stepped hook rear-mounted double-end jaw chuck and extends into the chuck rear shaft, and the sliding sleeve moves left and right, and the pull pin pushes or pulls the chuck rear shaft to move left or right, so that the two ends of the stepped hook rear-mounted double-end jaw chuck clamp or release the turning needle.

[0005] Among them, the stepped hook rear-mounted double-end jaw chuck is a claw structure with multiple open grooves on the conical outer wall surfaces at both ends, and the stepped hook is formed by a stepped platform arranged on the conical outer wall of the right end of the stepped hook rear-mounted double-end jaw chuck, the inner conical surface on the inner wall of the left end of the chuck rear shaft and the straight hole on its left end form an inner step surface, and the stepped hook is hung on the inner step surface, and the sliding sleeve is used to pull the chuck rear shaft to the right to realize the loosening of the needle at both ends of the stepped hook rear-mounted double-end jaw chuck.

[0006] Furthermore, a positioning platform for positioning the left and right movement of the chuck front shaft is formed on the outer circumferential wall of the chuck front shaft, and the positioning platform is located on the left side of the rotating shaft.

[0007] Furthermore, the tail sleeve, the locking sleeve and the head shell which are arranged on the periphery of the rotating shaft and form the housing of the dental handpiece are provided with internal water channels which are interconnected and used to receive external cooling water.

[0008] The advantages of the present invention compared with the prior art are:

[0009] 1. This technical solution realizes the clamping or releasing of the needle at both ends of the stepped hook rear-mounted double-end clamping chuck by pushing or pulling the rear shaft of the chuck and the stepped hook rear-mounted double-end clamping chuck to the left or right through the left and right movement of the sliding sleeve. The needle clamping structure is simple and the operation is convenient and quick.

[0010] 2. This technical solution adopts a stepped hook rear-mounted double-end jaw chuck with two sections of tapered structure. The right end of the stepped hook rear-mounted double-end jaw chuck is hooked and connected to the inner wall of the chuck rear shaft, which effectively solves the problem of incomplete separation of the outer conical surface of the left end of the stepped hook rear-mounted double-end jaw chuck and the inner conical surface of the chuck front shaft. The limit platform provided on the inner wall of the cavity limits the rightward movement position of the stepped hook rear-mounted double-end jaw chuck, preventing the left end of the stepped hook rear-mounted double-end jaw chuck from separating from the inner tapered hole of the chuck front shaft;

[0011] 3. This technical solution is conducive to the stable clamping of the needle. The needle withdrawal and clamping stroke of the stepped hook rear-mounted double-end clamping chuck is small, the needle is highly efficient in disassembling and the clamping structure is compact.

[0012] 4. This technical solution reduces the spring force of the required clamping spring and the force required to open the stepped hook rear-mounted double-end clamping chuck while meeting the clamping force required for clamping the needle at both ends of the stepped hook rear-mounted double-end clamping chuck. The stepped hook rear-mounted double-end clamping chuck has a small structure, which saves internal space in the dental handpiece and helps reduce the weight of the dental handpiece.

[0013] 5. The clamping structure of this technical solution is novel in design, the clamping force meets the requirements of needle clamping, the needle clamping is convenient and quick to disassemble and replace, and the user experience is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention installed in a dental handpiece;

[0015] Figure 2 This is a structural schematic diagram of the needle clamping device of the present invention;

[0016] Figure 3 It is a schematic exploded perspective view of the needle clamping device of the present invention. DETAILED DESCRIPTION

[0017] The following is combined with Figure 1-3 An embodiment of the present invention is described to clearly and completely describe the technical solution. Obviously, the described embodiment is only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0019] A stepped hook rear-mounted bur clamping device for a dental low-speed mobile phone comprises a rotating shaft 1 and a sliding sleeve 2 with a clearance fit on the rotating shaft 1, a clamping spring 4 is installed in the cavity 3 of the rotating shaft 1, and the left side of the clamping spring 4 is provided with a chuck rear shaft 8 with a clearance fit with the cavity 3, a stepped hook rear-mounted double-end clamping jaw chuck 9 and a chuck front shaft 10 with the left end extending out of the cavity 3 in sequence, the two ends of the pull pin 6 provided at the right end of the chuck rear shaft 8 pass through the long slot hole 5 on the rotating shaft 1 and extend into the long slot 7 on the inner wall of the sliding sleeve 2, a spring 12 is sleeved on the rotating shaft 1 between the left end of the sliding sleeve 2 and the step surface inside the fixed sleeve 11, the outer conical surfaces on the left and right ends of the stepped hook rear-mounted double-end clamping jaw chuck 9 are respectively aligned with the chuck front shaft 10 and the chuck The inner conical surface of the rear shaft 8 is adapted, and the right end of the stepped hook rear-mounted double-end clamping claw chuck 9 is hooked and connected to the inner wall of the chuck rear shaft 8, and a limit platform 21 is formed on the inner wall of the cavity 3. The turning needle 13 passes through the chuck front shaft 10 and the stepped hook rear-mounted double-end clamping claw chuck 9 and extends into the chuck rear shaft 8. The sliding sleeve 2 moves left and right and the chuck rear shaft 8 is pushed or pulled by the pull pin 6 to move left or right to achieve the clamping or release of the turning needle 13 at both ends of the stepped hook rear-mounted double-end clamping claw chuck 9. In the above structure, when the sliding sleeve 2 moves to the left, the chuck rear shaft 8 is pushed to the left by the pull pin 6, so that the stepped hook rear-mounted double-end clamping claw chuck 9 and the chuck front shaft 10 are moved to the clamping position, that is, the outer cones at both ends of the stepped hook rear-mounted double-end clamping claw chuck 9 After the surfaces are respectively pressed against the inner conical surfaces of the chuck rear shaft 8 and the chuck front shaft 10, the two ends of the stepped hook rear-mounted double-end clamping jaw chuck 9 clamp the needle 13 firmly; when the sliding sleeve 2 moves to the right, the chuck rear shaft 8 is pulled to the right by the pull pin 6. Under the action of the positioning platform 16, the tapered outer wall surface of the right end is separated from the inner conical surface of the chuck rear shaft 8. Under the connection between the stepped hook 14 and the inner step surface 15, the stepped hook rear-mounted double-end clamping jaw chuck 9 is pulled to the right, so that the outer conical surface of the left end of the stepped hook rear-mounted double-end clamping jaw chuck 9 is separated from the inner conical surface of the chuck front shaft 10, until the step surface of the right end of the stepped hook rear-mounted double-end clamping jaw chuck 9 presses against the limit platform 21 and stops, and the stepped hook 14 is in contact with the inner conical surface of the chuck rear shaft 8. The inner step surface 15 on the surface is hooked and connected, which is conducive to the complete separation of the two ends of the stepped hook rear-mounted double-end clamping claw chuck 9 from the inner conical surfaces of the chuck front shaft 10 and the chuck rear shaft 8 in sequence, ensuring the smooth replacement of the needle 13; specifically, the stepped hook rear-mounted double-end clamping claw chuck 9 is a claw structure with a plurality of open grooves on the conical outer wall surfaces at both ends, and the stepped hook 14 is formed by a stepped platform provided on the conical outer wall of the right end of the stepped hook rear-mounted double-end clamping claw chuck 9, the inner conical surface on the inner wall of the left end of the chuck rear shaft 8 and the straight hole on its left end form an inner step surface 15, and the stepped hook 14 is hooked on the inner step surface 15, and the chuck rear shaft 8 is pulled to the right by the sliding sleeve 2 to realize the loosening of the needle 13 at both ends of the stepped hook rear-mounted double-end clamping claw chuck 9;Specifically, a positioning platform 16 is formed on the outer circumferential wall of the chuck front shaft 10 to position the chuck front shaft 10 when it moves left or right, and the positioning platform 16 is located on the left side of the rotating shaft 1. Specifically, a tail sleeve 17, a locking sleeve 18, and a head shell 19, which are arranged on the periphery of the rotating shaft 1 and form the housing of the dental handpiece, are formed with an internal water channel 20 that is interconnected and used to receive external cooling water.

[0020] When installing or replacing the needle 13, the operator rotates the locking sleeve 18 counterclockwise, and with the cooperation of the steel ball and the spiral groove, the locking sleeve 18 drives the sliding sleeve 2 to move to the right. At this time, during the right movement, the outer conical surface of the right end of the stepped hook rear-mounted double-end jaw chuck 9 is disengaged from the inner conical surface of the chuck rear shaft 8. Under the pull of the inner step surface 15 of the chuck rear shaft 8, the conical outer wall of the left end of the stepped hook rear-mounted double-end jaw chuck 9 is disengaged from the inner conical surface of the chuck front shaft 10. At this time, the claws at the left and right ends of the stepped hook rear-mounted double-end jaw chuck 9 are fully opened. At this time, the needle 13 can be installed or replaced. When the sliding sleeve 12 moves to the right, under the action of the spring 12, the operator can easily rotate the locking sleeve 18, and the replacement saves time and effort.

[0021] When clamping and fixing the turning needle 13, after fully opening the claws at the left and right ends of the stepped hook rear-mounted double-end jaw chuck 9 according to the above steps, pass the turning needle 13 through the chuck front shaft 10 and the stepped hook rear-mounted double-end jaw chuck 9 and extend it into the chuck rear shaft 8, loosen the locking sleeve 18 by hand, so that the sliding sleeve 2 presses the pull pin 6 to the left under the action of the restoring force of the clamping spring 4, so that the inner conical surfaces of the chuck rear shaft 8 and the chuck front shaft 10 respectively press the outer conical surfaces at both ends of the stepped hook rear-mounted double-end jaw chuck 9, and the turning needle 13 is clamped by the claws at the left and right ends of the stepped hook rear-mounted double-end jaw chuck 9.

[0022] In this structure, when the rear clamping force of the stepped hook rear-mounted double-end clamping chuck 9 is greater than the front clamping force, when the chuck rear shaft 8 moves to the right, the outer conical surface of the left end of the stepped hook rear-mounted double-end clamping chuck 9 and the inner conical surface of the chuck front shaft 10 are first disengaged, and the stepped hook rear-mounted double-end clamping chuck 9 moves to the right with the chuck rear shaft 8 until the step surface of the right end of the stepped hook rear-mounted double-end clamping chuck 9 abuts against the limit table 21 and stops moving. When the chuck rear shaft 8 moves to the right, the outer conical surface of the right end of the stepped hook rear-mounted double-end clamping chuck 9 is disengaged. The conical surface is disengaged from the inner conical surface of the chuck rear shaft 8; when the rear clamping force of the stepped hook rear-mounted double-end jaw chuck 9 is less than the front clamping force, when the chuck rear shaft 8 moves to the right, the outer conical surface of the right end of the stepped hook rear-mounted double-end jaw chuck 9 is disengaged from the inner conical surface of the chuck rear shaft 8 first, and with the cooperation of the stepped hook 14 and the inner step surface 15, the chuck rear shaft 8 pulls the stepped hook rear-mounted double-end jaw chuck 9 to move right, completing the disengagement of the left end of the stepped hook rear-mounted double-end jaw chuck 9 from the inner conical surface of the chuck front shaft 10.

[0023] The present technical solution realizes the clamping or releasing of the two ends of the stepped hook rear-mounted double-end clamping claw chuck 9 on the turning needle 13 by pushing or pulling the pull pin 6 to the left or right through the left and right movement of the sliding sleeve 2. The clamping structure of the turning needle 13 is simple and the operation is convenient and quick. The stepped hook rear-mounted double-end clamping claw chuck 9 with two sections of conical structure is adopted, and the right end of the stepped hook rear-mounted double-end clamping claw chuck 9 is hooked and connected with the inner wall of the chuck rear shaft 8, which effectively solves the problem that the outer conical surface of the left end of the stepped hook rear-mounted double-end clamping claw chuck 9 is not completely separated from the inner conical surface of the chuck front shaft 10. The rightward movement position of the stepped hook rear-mounted double-end clamping claw chuck 9 is limited by the limit platform 21 arranged on the inner wall of the cavity 3 The stepped hook rear-mounted double-end clamping jaw chuck 9 has a small structure, which saves the internal space of the dental mobile phone and is beneficial to the weight reduction of the dental mobile phone. The clamping structure is novel in design, the clamping force meets the clamping requirements of the needle 13, the needle 13 is clamped and replaced conveniently and quickly, and the user experience is good.

[0024] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A stepped hook rear-mounted needle clamping device for a low-speed dental handpiece, comprising a rotating shaft (1) and a sliding sleeve (2) with a clearance fit on the rotating shaft (1), characterized in that: A clamping spring (4) is installed in the cavity (3) of the rotating shaft (1), and the left side of the clamping spring (4) is provided with a chuck rear shaft (8) that is clearance-matched with the cavity (3), a stepped hook rear-mounted double-end clamping claw chuck (9) and a chuck front shaft (10) whose left end extends out of the cavity (3). The two ends of the pull pin (6) provided at the right end of the chuck rear shaft (8) pass through the long slot hole (5) on the rotating shaft (1) and extend into the long slot (7) on the inner wall of the sliding sleeve (2). The rotating shaft (1) is provided with a spring (12) located between the left end of the sliding sleeve (2) and the inner step surface of the fixed sleeve (11). The stepped hook rear-mounted double-end clamping claw The outer conical surfaces at the left and right ends of the chuck (9) are respectively adapted to the inner conical surfaces of the chuck front shaft (10) and the chuck rear shaft (8); the right end of the stepped hook rear-mounted double-end clamping claw chuck (9) is hooked and connected to the inner wall of the chuck rear shaft (8); and a limit platform (21) is formed on the inner wall of the cavity (3); the turning needle (13) passes through the chuck front shaft (10) and the stepped hook rear-mounted double-end clamping claw chuck (9) and extends into the chuck rear shaft (8); the sliding sleeve (2) moves left and right, and the pull pin (6) pushes or pulls the chuck rear shaft (8) to move left or right, thereby achieving the clamping or release of the turning needle (13) by the two ends of the stepped hook rear-mounted double-end clamping claw chuck (9); The stepped hook rear-mounted double-end clamping claw chuck (9) is a claw-type structure with a plurality of open grooves formed on the tapered outer wall surfaces at both ends, and the stepped hook (14) is formed by a stepped platform provided on the tapered outer wall at the right end of the stepped hook rear-mounted double-end clamping claw chuck (9), the inner conical surface on the inner wall at the left end of the chuck rear shaft (8) and the straight hole at its left end form an inner step surface (15), and the stepped hook (14) is hooked on the inner step surface (15), and the sliding sleeve (2) is used to pull the chuck rear shaft (8) to the right to realize the loosening of the needle (13) at both ends of the stepped hook rear-mounted double-end clamping claw chuck (9); A positioning platform (16) for positioning the left and right moving position of the chuck front shaft (10) is formed on the outer circumferential wall of the chuck front shaft (10), and the positioning platform (16) is located on the left side of the rotating shaft (1); When the sliding sleeve (2) moves to the left, the chuck rear shaft (8) is pushed to the left by the pull pin (6), so that the stepped hook rear-mounted double-end clamping claw chuck (9) and the chuck front shaft (10) move to the clamping position; when the sliding sleeve (2) moves to the right, the chuck rear shaft (8) is pulled to the right by the pull pin (6), and under the action of the positioning platform (16), the stepped hook rear-mounted double-end clamping claw chuck (9) with the tapered outer wall surface of the right end separated from the inner tapered surface of the chuck rear shaft (8) is pulled to the right by the connection between the stepped hook (14) and the inner step surface (15), so that the outer tapered surface of the left end of the stepped hook rear-mounted double-end clamping claw chuck (9) is separated from the inner tapered surface of the chuck front shaft (10), until the step surface of the right end of the stepped hook rear-mounted double-end clamping claw chuck (9) stops after it abuts on the limit platform (21).

2. The stepped hook rear-mounted bur clamping device for a low-speed dental handpiece according to claim 1, characterized in that: An internal water channel (20) that is interconnected and used to receive external cooling water is formed in the tail sleeve (17), the locking sleeve (18), and the head shell (19) that are arranged on the periphery of the rotating shaft (1) and form the housing of the dental mobile phone.

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