JP2006122080A - Dental handpiece, dental treatment appliance used therefor and appliance retaining mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dental handpiece ensuring a retaining force from the rotating direction and thrusting direction to a dental treatment appliance inserted in a sleeve, and to provide a dental treatment appliance used therefor and an appliance retaining mechanism. <P>SOLUTION: The sleeve receiving the dental treatment appliance includes an appliance retaining member slidably provided in the sleeve for detachably retaining the dental treatment appliance; and the appliance retaining member and the dental treatment appliance are provided with engagement parts mutually engaged with each other for suppressing the relative movements of the dental treatment appliance in the sleeve in the rotating direction and the thrusting direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dental handpiece, a dental treatment tool used therefor, and a tool holding mechanism.

As a conventional dental handpiece, for example, the one shown in FIG. 5 is known. In this dental handpiece 70, a sleeve is rotationally driven by compressed air, and a coil spring 73 is inserted in the vicinity of the lower end opening 72a of the rotor shaft 72 constituting the sleeve. A tool holding member 80 is inserted so as to come into contact, and a tubular taper member 75 is screwed from the upper end of the rotor shaft 72 to fill the clearance between the tool holding member 80 and the rotor shaft 72. A taper 75 a that expands downward is formed on the inner periphery of the lower end of the taper member 75.
As shown in the perspective view of FIG. 6, the tool holding member 80 includes an upper tubular portion 81, a diameter-expanded portion 82 formed so that the outer peripheral surface expands toward one end, and the diameter-expanded portion 82. An annular portion 83 provided below, and the upper tubular portion 81, the enlarged diameter portion 82, and the annular portion 83 are integrally formed via circumferential grooves 84, 85. A slit 86 is formed in the slit 86, and a small piece 87 is fitted into the slit 86.
As shown in FIG. 7, the dental treatment tool 90 has a shaft 91 with a diameter reduced toward the cutting blade 92 at the tip, and is formed to have the same shaft diameter from the intermediate portion to the rear end 93.

  In the sleeve configured as described above, since the tool holding member 80 is biased upward by the coil spring 73, each small piece 87 comes into contact with the taper 75a and is pressed inward to press the dental treatment tool 90 inserted into the sleeve. Thus, the dental treatment tool 90 is held.

A configuration in which a small piece is fitted into a slit formed in the tool holding member and the dental treatment tool is gripped by this small piece is described in Japanese Utility Model Publication No. 61-30650 (Patent Document 1) of the present applicant. In addition to this, the present applicant has filed an application relating to a holding mechanism for a dental treatment tool, which is described in Japanese Patent Laid-Open No. 2002-345844 (Patent Document 2).
Japanese Utility Model Publication No. 61-30650 JP 2002-345844 A

  The present invention further improves the holding mechanism for the dental treatment tool in the above prior art, and the problem is that the holding force in the rotational direction and the thrust direction with respect to the dental treatment tool inserted into the sleeve is further increased. It is an object of the present invention to provide a dental handpiece that can be surely provided, a dental treatment tool used therefor, and a tool holding mechanism.

  In order to solve the above-mentioned problems, in the present invention, in a dental handpiece provided with a means for rotatably supporting a sleeve for receiving a dental treatment tool and rotationally driving the sleeve, the sleeve serves as the dental treatment tool. A tool holding member slidably provided in the sleeve for holding in a detachable manner, the tool holding member and the dental treatment tool being relative to the rotational direction and the thrust direction of the dental treatment tool in the sleeve; There is provided a dental handpiece in which engaging portions that engage with each other to suppress the respective movements are respectively provided on the sleeve and the dental treatment tool.

  As an engagement part in the above-mentioned dental handpiece, for example, from a polygonal column part formed at the rear end of a dental treatment tool and a polygonal cylinder part formed in a tool holding member so as to engage with this polygonal column part Can be configured. In the dental handpiece having such an engaging portion, when the dental treatment tool is inserted into the sleeve, the polygonal column portion of the dental treatment tool engages with the polygonal cylinder portion in the tool holding member, Relative movement in the rotation direction such as idle rotation of the dental treatment tool can be suppressed.

  Furthermore, as an engaging part in the dental handpiece, for example, a narrower diameter part than the other part is formed in the dental treatment tool, and a plurality of holes are formed in the tool holding member. It is possible to adopt a configuration in which a sleeve is fitted to these holes, and a tapered portion is provided on the sleeve so that the convex member can be pressed from the outside to be crimped to the small diameter portion. In a dental handpiece provided with this engaging portion, when inserting a dental treatment tool into the sleeve, the tool holding member is slid within the sleeve, and the convex member is brought into contact with the tapered portion so as to face from the outside to the inside. By pushing, the convex member is engaged with the small-diameter portion, and relative movement such as displacement in the thrust direction of the dental treatment tool in the sleeve is suppressed.

  In the present invention, a dental treatment tool that can be used for the dental handpiece, a cutting blade for cutting the affected part is formed at the tip of the shaft, and a polygonal column is formed at the rear end of the shaft, A dental treatment tool is provided in which a thin-diameter portion whose diameter is relatively narrower than other portions is formed in an intermediate portion of the shaft.

  According to the present invention, there is also provided a dental treatment tool holding mechanism usable for the dental handpiece, the holding mechanism including a tool holding member slidably provided in a sleeve for receiving the dental treatment tool. A polygonal cylindrical portion is formed in the vicinity of the rear end in the tool holding member, a plurality of holes are formed in the outer peripheral portion, a convex member is fitted in each hole, and these convex members are in contact with each other from the outside. A tool holding mechanism is provided in which the sleeve is provided with a taper portion for pushing toward the inside.

  In the dental handpiece of the present invention, the engaging portions of the dental treatment tool and the sleeve are engaged with each other, so that the movement of the dental treatment tool in the rotation direction such as idle rotation in the sleeve can be suppressed, and the thrust of the dental treatment tool Relative movement such as displacement in the direction can also be suppressed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 are sectional views of the head portion of the dental handpiece of the present invention, FIG. 1 shows a state where the dental treatment tool is removed, and FIG. 2 shows a state where the dental treatment tool is inserted. Is shown.
The dental handpiece 10 of the present invention is provided with a head portion 12 of FIG. 1 at a neck portion 11 at the tip of a gripping portion (not shown), and a compressed air supply passage (not shown) is provided in the neck portion 11 and the gripping portion. ) And an exhaust passage (not shown), and the sleeve is rotationally driven by compressed air supplied through the exhaust passage. The head portion 12 has a rotor shaft 14 as a sleeve for receiving and detachably holding a dental treatment tool 13, a taper member 15, and a tool holding member 16. The sleeve is rotated by compressed air on the rotor shaft 14. A rotor 18 is provided for driving, and ball bearings 19 and 20 are provided above and below the rotor shaft 14 for rotatably supporting the sleeve. These components are housed in a cartridge case 21, and this cartridge case A head housing 22 is provided on the outer periphery of the head 21, a head cap 23 is screwed into the head housing 22, and a spring 24 and a push button 25 are provided on the head cap 23.

  A coil spring 26 is inserted near the lower end opening 14 a of the rotor shaft 14, the tool holding member 16 is inserted so as to contact the upper end of the coil spring 26, and the taper member 15 is inserted from the upper end of the rotor shaft 14. It is provided and is fixed to the rotor shaft 14 by a ring screw 17. A taper 15 a that expands downward is formed on the inner periphery of the lower end of the taper member 15.

In the dental treatment tool 13, a cutting blade 13a for cutting the affected part is formed at the front end of the shaft, a polygonal column part 13b is formed at the rear end of the shaft, and the diameter is relatively larger in the middle part of the shaft than other parts. A thin small-diameter portion 13c is formed.
Here, the polygonal column portion 13b can be formed in a hexagonal column shape as seen at the head of a bolt, for example. The narrow diameter portion 13c may be formed to be thinner than the front and rear shaft portions 13d and 13e. For example, the narrow diameter portion 13c is formed to have a diameter of 1.55 mm and the front and rear shaft portions 13d and 13e are formed to be 1.60 mm. Can do.

The tool holding member 16 is a member formed in a cylindrical shape so that the dental treatment tool 13 can be received, and a polygonal cylindrical portion 16a is formed inside. This polygonal cylinder part 16a is formed in the shape which the polygonal column part 13b of the dental treatment tool 13 can engage.
The tool holding member 16 has substantially the same configuration as that of the conventional product in FIG. 6 except that the polygonal cylindrical portion 16a is provided, and is formed so that the outer peripheral surface expands toward one end. The enlarged diameter portion 16b is provided with slits 16c at three locations, and small pieces 27 are fitted into the slit 16c. The small piece 27 is formed such that upper and lower ends 27a and 27b are engaged with the enlarged diameter portion 16b, an inner peripheral surface 27c is formed so as to be crimped to the small diameter portion 13c of the dental treatment tool 13, and an outer peripheral surface 27d is formed. It is formed with substantially the same inclination so as to come out slightly outside the enlarged diameter portion 16b.

Next, the operation of the dental handpiece 10 shown in FIGS. 1 and 2 will be described.
In FIG. 1, since the tool holding member 16 is urged upward by the coil spring 26, the outer peripheral surface 27d of each small piece 27 contacts the taper 15a and is pushed inward.
When the push button 25 of the head portion 12 is pushed down, it comes into contact with the upper end portion of the tool holding member 16, and the tool holding member 16 resists the force of the coil spring 26 and moves downward in the holes of the rotor shaft 14 and the taper member 15. To slide. By this sliding, each small piece 27 is released from the pressing force received from the taper 15a, and the inner diameter of each small piece 27 is slightly enlarged. Then, when the dental treatment tool 13 is inserted into the rotor shaft 14 and pushed in until the polygonal column portion 13b engages with the polygonal cylinder portion 16a, and the force to push down the push button 25 is released, the tool holding member 16 is moved upward by the coil spring 26. The outer peripheral surface of each small piece 27 abuts against the taper 15a and receives a pressing force, and the inner peripheral surface 27c is pressed against the small diameter portion 13c of the dental treatment tool 13 as shown in FIG.
In the dental handpiece 10, the polygonal column portion 13 b of the dental treatment tool 13 is engaged with the polygonal cylindrical portion 16 a of the tool holding member 16 as described above, so that the dental treatment tool 13 rotates in the rotation direction such as idle rotation. Movement is suppressed. Moreover, when the inner peripheral surface 27c of each small piece 27 is crimped to the small diameter portion 13c of the dental treatment tool 13, movement of the dental treatment tool 13 such as displacement in the thrust direction is suppressed.

Next, FIGS. 3 and 4 are cross-sectional views of the head portion 12 in a dental handpiece 40 of an embodiment different from FIGS. 1 and 2, and FIG. 3 shows a state where the dental treatment tool 33 is removed. FIG. 4 shows a state in which the dental treatment tool 33 is inserted. Hereinafter, regarding the embodiment of FIGS. 3 and 4, configurations different from those of FIGS. 1 and 2 will be mainly described.
In the tool holding member 36 in the dental handpiece 40 of FIG. 3, a sphere 37 is used instead of the small piece 27 in FIGS. 1 and 2, and a sphere engaging hole 36c is formed instead of the slit 16c. The configuration is substantially the same as that shown in FIGS. The spherical body engaging hole 36c is a hole penetrating from the outer peripheral side to the inner peripheral side of the enlarged diameter portion 36b, and the outer peripheral side is formed to be slightly larger than the inner peripheral side. That is, the spherical body engaging hole 36c can be attached to and detached from the spherical body engaging hole 36c from the outer peripheral side of the enlarged diameter portion 36b, and the spherical body 37 does not fall out from the inner peripheral side of the spherical body engaging hole 36c. It is formed as follows.
Further, in the dental treatment tool 33 in FIG. 3, a spherical body engaging groove 33c is formed instead of the small diameter portion 13c, and other configurations (such as the cutting blade 33a and the polygonal column portion 33b) are the same as those in FIGS. It is formed in almost the same way. The spherical body engaging groove 33c is a groove formed in a complementary curved surface so that the spherical body 37 protruding to the inner peripheral side of the spherical body engaging hole 36c is engaged, and is thinner than the front and rear shaft portions 33d and 33e. It is a portion that can be called a narrow-diameter portion in that it is formed.

Next, the operation of the dental handpiece 40 shown in FIGS. 3 and 4 will be described.
In FIG. 3, since the tool holding member 36 is urged upward by the coil spring 26, each sphere 37 is in contact with the taper 15a and is pushed inward.
When the push button 25 of the head portion 12 is pushed down, the tool holding member 36 slides downward, and each sphere 37 is released from the pressing force received from the taper 15a, and each sphere 37 is slightly in the sphere engagement hole 36c. It becomes possible to move to. Then, when the dental treatment tool 33 is inserted into the rotor shaft 14 and pushed in until the polygonal column portion 33b engages with the polygonal cylinder portion 36a, and the force to push down the push button 25 is released, the tool holding member 36 is moved upward by the coil spring 26. The respective spheres 37 abut against the taper 15a and receive a pressing force, and each sphere 37 engages with the sphere engagement groove 33c of the dental treatment tool 33 as shown in FIG.
As described above, the spheres 37 of the tool holding member 36 are engaged with the sphere engaging grooves 33c of the dental treatment tool 33, so that the movement of the dental treatment tool 13 in the thrust direction is suppressed.

It is sectional drawing of the head part in the dental handpiece of this invention. FIG. 2 is a cross-sectional view of the dental handpiece of FIG. 1 with a dental treatment tool inserted. It is sectional drawing of embodiment different from FIG.1 and FIG.2. FIG. 4 is a cross-sectional view of the dental handpiece of FIG. 3 with a dental treatment tool inserted. It is sectional drawing of the conventional dental handpiece. It is a perspective view of the tool holding member in the dental handpiece of FIG. It is a side view of the conventional dental treatment tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Dental handpiece 13 Dental treatment tool 13a Cutting blade 13b Polygonal column part (engagement part)
13c Small diameter part 14 Rotor shaft (sleeve)
15 Taper member (sleeve)
15a Taper 16 Tool holding member (sleeve)
16a Polygonal cylinder part (engagement part)
16b Expanded portion 16c Slit 18 Rotor (sleeve rotation drive means)
27 Small pieces (convex members)
33 Dental treatment tool 33a Cutting blade 33b Polygonal column part (engagement part)
33c Sphere engaging groove (engaging part)
36 Tool holding member 36a Polygonal cylinder part (engagement part)
36b Expanded portion 36c Sphere engagement hole 37 Sphere (convex member)
40 Dental handpiece

Claims (5)

In a dental handpiece comprising a means for rotatably supporting a sleeve for receiving a dental treatment tool and means for rotationally driving the sleeve,
The sleeve includes a tool holding member slidably provided in the sleeve for detachably holding the dental treatment tool. The tool holding member and the dental treatment tool include a dental treatment tool in the sleeve. A dental handpiece in which engagement portions that engage with each other in order to suppress relative movement in the rotational direction and thrust direction are provided on the sleeve and the dental treatment tool, respectively.   An engagement portion that suppresses relative movement of the dental treatment tool in the rotational direction in the sleeve engages with the polygonal column portion formed at the rear end of the dental treatment tool, and the polygonal column portion. The dental handpiece according to claim 1, comprising a polygonal cylindrical portion formed in the holding member.   An engagement portion that suppresses relative movement of the dental treatment tool in the thrust direction within the sleeve includes a narrow-diameter portion having a diameter relatively narrower than other portions in the dental treatment tool, and a tool holding member. A convex member that is fitted in the formed hole and engages with the small-diameter portion, and the sleeve contacts the convex member from the outside and pushes toward the inside to the small-diameter portion. The dental handpiece according to claim 1, further comprising a tapered portion that enables crimping.   A dental treatment tool usable for the dental handpiece according to claim 1, wherein a cutting blade for cutting the affected part is formed at the tip of the shaft, and a polygonal column part is formed at the rear end of the shaft. A dental treatment tool characterized in that a narrow-diameter portion having a diameter that is relatively narrower than other portions is formed in the middle portion. A dental treatment tool retention mechanism usable in the dental handpiece of claim 1, comprising:
The holding mechanism includes a tool holding member slidably provided in a sleeve for receiving a dental treatment tool, a polygonal cylindrical portion is formed in the vicinity of the rear end in the tool holding member, and a plurality of holes are formed in the outer peripheral portion. A tool holding mechanism in which a convex member is fitted in each of the holes, and a tapered portion is provided on the sleeve for abutting the convex member from the outside and pushing them inward.

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