JP2000042000A - Chuck for dental cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ease cutting tool attachment and detachment work and increase a holding force even if the force to press a cap button is weak, by providing a chuck switching member provided with a circular projection inside and a chuck switching member pulling up and urging mechanism furnished with a spring body that normally urges in such a manner that it pulls up. SOLUTION: When a chuck member 12 is open, the circular projection 13a of a cylindrical chuck switching member 13 moves to the exterior near the center 12b of a chuck, the outside 12c of the upper end of the chuck of a hourglass-shaped chuck member 12 made of a strong elastic material opens, allowing a dental cutting tool to be inserted or removed easily. And then when the shank portion 10a is in a pinched state, the chuck member 12 closes with the chuck side 12a of the lower end of a slit as a supporting point, the center 12b of the chuck as a point of action and the outside of the upper end of the chuck containing the chuck switching member 13 as the point of application of a force, the chuck members 12b to 12c pinch strongly the shank portion 10a with the circular projection 13a by the action of a wedge while elastically deforming.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck device for holding a cutting tool, and more particularly, to a dental cutting tool chuck device capable of easily and reliably attaching and detaching a dental cutting tool.

[0002]

2. Description of the Related Art A dental cutting tool used in dental treatment can be replaced according to a treatment site, a treatment method and cutting contents, so that it can be easily attached to and detached from a dental handpiece without dropping and vibration. However, in the prior art, a slit and a tapered surface are provided on the outer peripheral portion of the end surface, and an inner peripheral tapered surface that comes into contact with the tapered surface is provided in the rotating shaft, and a force is applied in the axial direction by a spring. In many cases, a collet chuck mechanism is used, which provides a radial force at a tapered joint and tightens and holds a cutting tool.

[0003]

However, in order to obtain a strong holding force that prevents the tool from coming out of the collet chuck due to vibration of the tool during cutting, the taper angle of the chuck and the spring force greatly affect the above-mentioned chuck. When the cutting tool is attached or detached, the chuck must be opened by overcoming this spring force, and since the holding force and the releasing force of the chuck are opposed to each other, they can be easily attached and detached and have a strong It was not easy to obtain a chuck mechanism having a holding force. The present invention provides a dental cutting tool chuck device that solves these problems.

[0004]

In view of the above, the inventors of the present invention have made intensive studies and as a result, have solved the above-mentioned problems by the following means. (1) A cylindrical hollow shaft rotatably supported in the head of a dental handpiece, and a ring-shaped guide for guiding a shank portion of a dental cutting tool inserted into a lower portion of the hollow shaft. A chuck member made of a high-strength elastic material, which is provided directly above the guide member, has a vertical drum-shaped body, and has a plurality of vertical slits from the upper end to the middle of the lower part; and a wedge having elastic deformation. A cylindrical chuck opening / closing member, which is vertically movable in the axial direction for opening and closing by an action, and has an annular projection provided on the inner side thereof in sliding contact with a central concave portion or an upper outer peripheral surface of the upright drum-shaped body; A dental cutting tool chuck device, comprising: a chuck opening / closing member pulling / biasing mechanism including a spring body for biasing the opening / closing member to be pulled upward. (2) A cylindrical hollow shaft rotatably supported in the head of a dental handpiece, and a ring-shaped guide for guiding a shank portion of a dental cutting tool inserted into a lower portion of the hollow shaft. A chuck member made of a high-strength elastic material, which is provided on the guide member, is an upright drum-shaped body, and has a plurality of vertical slits from the upper end to the lower middle part, and the chuck member is elastically deformed. A cylindrical chuck opening / closing member, which can move vertically in the axial direction for opening and closing by a wedge action, and has an annular projection provided on the inner side thereof in sliding contact with the central concave portion or the upper outer peripheral surface of the upright drum-shaped body; And a chuck opening / closing member pulling urging mechanism having a spring body for urging the chuck opening / closing member upward to lift the chuck opening / closing member. When pressing down against the urging force of the spring body of the urging mechanism, opening the chuck member and inserting and removing the cutting tool, the central concave portion of the elastic material chuck member contacts or is adjacent to the shank portion of the cutting tool. In the case where the cutting tool is clamped, when the chuck opening / closing member is closed by the urging force of the spring body, the drum-shaped chuck member made of a high-strength elastic material provided with the vertical slit is provided. With respect to the shank portion of the cutting tool, the chuck member is closed with the vertical slit lower portion as a fulcrum, the central concave portion as an action point, and a position in contact with the chuck opening / closing member as a power point, and the elastic deformation of the chuck member itself. A dental cutting tool chuck device for holding a cutting tool.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0006]

1 is a longitudinal sectional view of a dental cutting tool chuck device according to an embodiment of the present invention. In the figure, 1 is a turbine head, 2 is a cap button, 3 is a lid, 4 is a turbine case, 5 is a turbine case cap, 6 is a cushioning material, 7 is a hollow shaft, 8 is a bearing, 9 is a turbine blade, and 10 is a dental blade. Cutting tool, 11 is a guide member, 12 is a chuck member, 13 is a chuck opening / closing member, 14 is a spring, and 15 is a push button. FIG. 1 is a drawing when a dental cutting tool 10 is mounted. As shown,
The turbine head 1 is a housing, and a lid 3 provided with a cap button 2 movably incorporated is screwed to an opening on the upper surface. Inside the turbine case 4 and the turbine case cap 5 in the turbine head 1, a hollow shaft 7 is rotatably housed via a buffer material 6 and a bearing 8.

[0007] A turbine blade 9 is bonded and fixed to the hollow shaft 7, and a dental cutting tool 1 is provided inside the turbine blade 9.
0 and a chuck member 12 made of a high-strength elastic material having a plurality of vertical slits 120 from the lower middle to the upper end of the drum-shaped body in an upright state. In order to open and close, a chuck opening / closing member 13 that can move up and down in the axial direction is stretched by a spring 14 of a chuck opening / closing member pulling urging mechanism. The chuck opening / closing member 13 is for opening and closing the chuck member 12 by a wedge action accompanied by elastic deformation, and is moved up and down in the axial direction so that the chuck opening / closing member 13 is formed in a central concave portion or an upper outer peripheral surface of the upright drum-shaped body of the chuck member 12. Annular protrusion 13a that comes into sliding contact
Are provided inside the cylindrical body.

In the chuck device having the above structure, when the dental cutting tool 10 is mounted, the cap button 2 is pressed against the urging force of the spring 14 of the chuck opening / closing member pulling urging mechanism via the push button 15. Push it in,
When the chuck opening / closing member 13 is moved downward, the chuck member 12 opens. The shank portion 10a of the dental cutting tool 10 inserted at this time is in contact with or adjacent to the chuck center concave portion 12b (see FIG. 2).

Next, the shank 1 of the dental cutting tool 10
0a, the cap button 2 is released, the chuck opening / closing member 13 moves upward by the biasing restoring force of the spring 14, and the chuck member 12 is closed to close the shank portion 10a.
(FIG. 1).

The above state will be described with reference to FIG. FIG. 2 is an enlarged longitudinal sectional view of a chuck member made of a high-strength elastic material for a drum-shaped body according to the present invention. In the drawing, 12a is the chuck surface at the lower end of the slit, 12b is the recess at the center of the chuck,
c indicates the upper end of the chuck, and 120 indicates a slit. FIG. 2 shows a state where the chuck member 12 is opened,
The annular projection 13a of the cylindrical chuck opening / closing member 13 has:
It moves to the outer surface near the center recess 12b of the chuck, and the outer end 12c of the chuck upper end 12c of the drum-shaped high-strength elastic material (made of steel) is open, so that the dental cutting tool 10 can be easily inserted and removed. Has become.

Next, the shank portion 1 of the dental cutting tool 10
When the chuck member 12 is in the holding state, the chuck member 12 supports the vicinity of the chuck lower surface 12a of the slit in FIG. It is closed as a point of force, and the shank portion 10a of the dental cutting tool 10 is firmly held by the wedge action between the chuck member 12b and the annular protrusion 13a while elastically deforming at the portions 12b to 12c (FIG. 1).

FIG. 3 is a longitudinal sectional view of the inside of a turbine head showing a conventional collet chuck mechanism. In the figure, reference numeral 16 denotes a collet chuck. FIG. 3 shows a dental cutting tool 10.
(Virtual line) is held. It has a slit and a tapered surface on the outer peripheral surface of the end face, an inner peripheral tapered surface that comes into contact with the tapered surface is provided in the rotating shaft, a force is applied in the axial direction by a spring, and the force is changed to a radial force at the tapered joint, and cutting is performed. The tool is tightened and held. As described above, when inserting or removing the cutting tool, the chuck must be opened by overcoming the spring force, and since the holding force and the releasing force of the chuck are opposed to each other, they can be easily attached and detached. Obtaining a chuck mechanism with strong holding power has not been easy.

[0013]

According to the dental cutting tool chuck of the present invention, the following excellent effects are exhibited. 1. According to the invention of claims 1 and 2 of the present invention, a cylindrical hollow shaft rotatably supported in the head of a dental handpiece and inserted into a lower portion of the hollow shaft. A ring-shaped guide member for guiding a shank portion of a dental cutting tool, and an upright drum-shaped body provided immediately above the guide member and made of a high-strength elastic material provided with a plurality of vertical slits from the upper end to the lower middle. A chuck member, and an annular protrusion that can move up and down in the axial direction for opening and closing the chuck member by a wedge action accompanied by elastic deformation, and that slides on the central concave portion or the upper outer peripheral surface of the upright drum-shaped member are provided inside. And a chuck opening / closing member pulling biasing mechanism having a spring body for constantly urging the chuck opening / closing member upward. When the chuck opening / closing member is pushed down against the urging force of the spring body of the lifting urging mechanism to open the chuck member and insert / detach a cutting tool, the central concave portion of the elastic material-made chuck member is provided with a cutting tool. Because it comes into contact with or adjacent to the shank of the cutting tool, the attachment and detachment of the cutting tool is easy,

In the case of holding the cutting tool, when the chuck opening / closing member is closed by the urging force of the spring body, the drum-shaped chuck made of a high-strength elastic material and having the vertical slit is provided. The member is a fulcrum at the lower part of the vertical slit with respect to the shank of the cutting tool,
With the central recess as the point of action and the position in contact with the chuck opening / closing member as the point of force, the chuck member is closed and the cutting tool is clamped by the elastic deformation of the chuck member itself. Since the effect of the elastic force of the chuck itself increases, the holding force can be increased even if the force pressing the cap button is weak.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a dental cutting tool chuck device according to an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of a chuck member made of a high-strength elastic material according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a conventional collet chuck mechanism of a turbine head.

[Explanation of symbols]

1: Turbine head 2: Cap button 3: Lid 4: Turbine case 5: Turbine case cap 6: Buffer material 7: Hollow shaft 8: Bearing 9: Turbine blade 10: Dental cutting tool 10a: Shank portion 11: Guide member 12 : Chuck member 12a: slit lower end chuck surface 12b: chuck center concave portion 12c: chuck upper end outer side 13: chuck opening and closing member 13a: annular projection 14: spring 15: push button 16: collet chuck 120: slit

Claims (2)

[Claims] A cylindrical hollow shaft rotatably supported in a head of a dental handpiece, and a ring for guiding a shank portion of a dental cutting tool inserted into a lower portion of the hollow shaft. A guide member, a chuck member made of a high-strength elastic material, which is provided directly above the guide member, is an upright drum-shaped body, and has a plurality of vertical slits from the upper end to the lower middle, and elastically deforms the chuck member. A cylindrical chuck opening / closing member that can move up and down in the axial direction for opening and closing by the accompanying wedge action, and has an annular projection provided on the inner side thereof in sliding contact with the central concave portion or the upper outer peripheral surface of the upright drum-shaped body, A chuck opening / closing member pulling urging mechanism including a spring body for urging the chuck opening / closing member upward so as to be pulled upward; 2. A cylindrical hollow shaft rotatably supported in the head of a dental handpiece, and a ring for guiding a shank portion of a dental cutting tool inserted into a lower portion of the hollow shaft. A guide member, a chuck member made of a high-strength elastic material and provided with a plurality of vertical slits provided immediately above the guide member and having an upright drum-shaped body and a plurality of vertical slits from the upper end to the lower middle, and elastically deforming the chuck member A cylindrical chuck opening / closing member which can move up and down in the axial direction for opening / closing by a wedge action accompanied by an annular projection provided on the inner side thereof, which is in sliding contact with the central concave portion or the upper outer peripheral surface of the upright drum-shaped body; And a chuck opening / closing member pulling urging mechanism having a spring body for urging the chuck opening / closing member upward. When pressing down against the urging force of the spring body of the lifting urging mechanism, opening the chuck member and inserting and removing the cutting tool, the central recess of the chuck member made of the elastic material contacts the shank portion of the cutting tool or Adjacent, and, in the case of holding the cutting tool, closing the chuck member by the urging force of the spring body the chuck opening and closing member,
The drum-shaped chuck member made of a high-strength elastic material provided with the vertical slit has a fulcrum at a lower portion of the vertical slit, an operation point at a central concave portion, and a position in contact with a chuck opening / closing member with respect to a shank of the cutting tool. The dental cutting tool chuck device is characterized in that the chuck member is closed with the power point as a force point, and the cutting tool is held by elastic deformation of the chuck member itself.