KR101673973B1

KR101673973B1 - Handpiece

Info

Publication number: KR101673973B1
Application number: KR1020150045216A
Authority: KR
Inventors: 신정필
Original assignee: 주식회사 세양
Priority date: 2015-03-31
Filing date: 2015-03-31
Publication date: 2016-11-08
Also published as: KR20160116870A

Abstract

A handpiece capable of finely adjusting the angle of engagement of a pawl fixing unit with respect to a motor unit is disclosed. The disclosed handpiece includes a file fixing unit coupled to a motor unit and a motor unit, wherein the file is detachably coupled and receives power from the motor unit to rotate the file. The motor unit includes a fastening shaft housing surrounding the motor shaft of the electric motor, and a rotation preventing pin projecting inward from the fastening shaft housing. The file securing unit includes a power transmission shaft connected to the motor shaft and a fastening shaft extending and extending around the power transmission shaft and fitted into the fastening shaft housing when the file securing unit is coupled to the motor unit. A plurality of anti-rotation slits extending in a direction parallel to the rotation axis of the motor shaft are formed on the outer circumferential surface of the fastening shaft at constant angular intervals, each of the anti-rotation slits having a width at which the end of the anti-

Description

Handpiece {Handpiece}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handpiece, and more particularly, to a handpiece having a motor unit and a file fixing unit detachable from the motor unit.

For example, handpieces used for dental procedures such as neuropathy and implants are used to spin a file, a small tool, at high speed to cut teeth, puncture the jawbone or puncture the teeth, A handpiece called a piece is commonly used. A contra-angle handpiece is a handpiece which is not straight and extends in an obtuse angle, and is a handpiece to be held by a dentist who is a practitioner. The contra-angle handpiece includes a motor unit including an electric motor, And a file fixing unit for transmitting the rotational force of the electric motor to the file to rotate the file at a high speed.

The file fixing unit is detachably coupled to the motor unit. The rotation of the pile fixing unit relative to the longitudinal axis of the motor unit when the pile fixing unit is coupled to the motor unit interferes with the correct operation of the practitioner, Is provided on the contra angle handpiece. For example, a protrusion protruding in the longitudinal direction of the motor unit may be provided in the file fixing unit, and a groove for receiving the protrusion may be formed at a point of the motor unit facing the protrusion. Conversely, a protrusion may be provided in the motor unit, and a groove for receiving the protrusion may be formed in the pile fixing unit.

However, such a conventional anti-rotation means can not adjust the angle of engagement of the pile fixing unit with respect to the motor unit, or can adjust the engagement angle only limitedly, and can cope with the difference of the handpiece holding method according to the practitioner's habit or taste none. That is, depending on the practitioner, the user feels inconvenience in using the handpiece limited to a specific angle of engagement and avoids use.

Korean Patent Publication No. 10-2009-0040873

The present invention provides a handpiece capable of finely adjusting the angle of engagement of a file fixing unit with respect to a motor unit.

The present invention relates to a motor unit and a handpiece having a file fixing unit coupled to the motor unit and having a file detachably coupled and receiving power of the motor unit to rotate the file, Wherein the motor unit includes a coupling shaft housing surrounding the motor shaft of the electric motor and a rotation preventing pin protruding inward from the coupling shaft housing, And a coupling shaft which surrounds the power transmission shaft and is fitted in the coupling shaft housing when the file fixing unit is coupled to the motor unit, A rotation preventing pin having a width at which the distal end of the rotation preventing pin is fitted and extending in a direction parallel to the rotation axis of the motor shaft Provides a handpiece, it characterized in that a plurality of anti-rotation slit (slit) are formed at regular angular intervals.

The plurality of anti-rotation slits may be formed at intervals of 1 to 20 degrees.

One end of each of the opposite longitudinal ends of the anti-rotation slit closer to the motor shaft may be opened to allow the anti-rotation fin to enter and withdraw from the anti-rotation slit.

The fastening shaft may have a small diameter portion that is relatively closer to the motor shaft and a large diameter portion that is larger in diameter than the small diameter portion and more spaced from the motor shaft than the small diameter portion and has the large diameter portion have.

The pawl fixing unit may further include a locking spring, which is pressed against the inner surface of the tightening shaft housing when the fastening shaft is fitted in the fastening shaft housing on the outer circumference of the fastening shaft, And the locking spring is brought into close contact with the inner surface of the fastening shaft housing to prevent unintentional separation of the pile fixing unit and the motor unit.

The inner side surface of the fastening shaft housing may be formed with a stepped engagement protrusion so as to interfere with the locking spring.

The distal end of the anti-rotation fin may have a convex curved surface shape.

According to the present invention, when the pile fixing unit is coupled to the motor unit, the angle of engagement of the pile fixing unit with respect to the motor unit can be finely adjusted and fixed. Therefore, it is possible to change the coupling angle according to the habit or taste of the handpiece of the dental practitioner, so that the handpiece can be conveniently used without any problem.

1 is a side view of a handpiece according to an embodiment of the present invention, showing a separated view of a motor unit and a pile fixing unit.
Fig. 2 is a partially enlarged cross-sectional view of the handpiece of Fig. 1, showing a portion where the motor unit and the pile fixing unit are coupled.
Fig. 3 is a cross-sectional view cut along the line III-III of Fig. 2;
FIG. 4 is a rear view of a handpiece according to an embodiment of the present invention, in which a motor unit and a pile fixing unit are combined.

Hereinafter, a handpiece according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The terminology used herein is a term used to properly express the preferred embodiment of the present invention, which may vary depending on the intention of the user or operator or the custom of the field to which the present invention belongs. Therefore, the definitions of these terms should be based on the contents throughout this specification.

Fig. 1 is a side view of a handpiece according to an embodiment of the present invention, showing a separated view of a motor unit and a pile fixing unit, Fig. 2 is a partially enlarged sectional view of the handpiece of Fig. 1, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, and FIG. 4 is a rear view of a handpiece according to an embodiment of the present invention, FIG. 8 is a view showing a state in which a file fixing unit is coupled. 1 to 4, the handpiece 1 according to the embodiment of the present invention includes a motor unit 30, which is a part gripped by a practitioner, that is, a dentist at the time of dental treatment, And a pile fixing unit 5 coupled to the leading end of the pile. The motor unit 30 includes an electric motor 40 inside a motor unit housing 31 extending in a direction parallel to the Z axis.

The file fixing unit 5 includes a head portion 6 to which the file 2 is detachably engaged and a head portion 6 to which the file fixing unit 5 is coupled with the motor unit 30, And a neck portion 8 connecting the head portion 6 and the bag portion 12 to each other. The neck portion 8 extends along an inclined axis line PL inclined at a predetermined angle PA with respect to the longitudinal direction of the motor unit 30. [ The file fixing unit 5 receives the power of the electric motor 40 of the motor unit 30 and rotates the pile 2. [

A groove extending parallel to the Z axis is formed on the upper end of the motor unit 30 so that the fastening shaft 20 of the pile fixing unit 5 can be inserted and fastened. The shaft 41 is provided so as to protrude upward. The rotation axis CL of the motor shaft 41 extends parallel to the Z axis. The motor unit 30 has a fastening shaft housing 33 surrounding the motor shaft 41 and extending along the rotation axis CL such that the motor shaft 41 is disposed therein. The fastening shaft housing 33 has a substantially cylindrical shape and a rotation preventing pin 37 protruding inward toward the rotation axis CL is fastened to the upper side of the fastening shaft housing 33. The end of the anti-rotation pin 37 may be convex curved so that the anti-rotation slit 23 is not obstructed and friction can be reduced. The motor unit 30 shown in FIGS. 1 to 3 has only one rotation prevention pin 37, but the present invention is not limited thereto and a plurality of rotation prevention pins 37 may be provided.

The file fixing unit 5 includes a power transmission shaft 13 extending downward from the bag portion 12 along the rotation axis CL and a power transmission shaft 13 surrounding the power transmission shaft 13 and extending along the rotation axis CL And a fastening shaft (20) extending downward from the bag portion (12). A connector 16 connected to the motor shaft 41 when the pile fixing unit 5 is coupled to the motor unit 30 is provided at the lower end of the power transmission shaft 13 and the power transmission shaft 13 A first bevel gear 14 is provided at the upper end of the first bevel gear 14. A head connecting shaft 9 extending along the inclined axis line PL is provided in the neck 8 and a second bevel gear 14 engaging with the first bevel gear 14 is provided at a lower end of the head connecting shaft 9. [ A gear 10 is provided.

Therefore, when the file fixing unit 5 is coupled to the motor unit 30 and the motor shaft 41 is rotated, its rotational power is transmitted to the power transmission shaft 13 via the connector 16, 1 and the second bevel gears 14, 10 to the head connecting shaft 9. Although not shown, the rotational power of the head connecting shaft 9 is transmitted to a file chuck (not shown) detachably securing the pile 2 inside the head portion 6.

The fastening shaft 20 has a substantially cylindrical shape and is fitted into the fastening shaft housing 33 when the fastening unit 5 is engaged with the motor unit 30. [ The fastening shaft (20) has a small diameter portion (21) and a large diameter portion (22). The small diameter portion 21 is disposed relatively lower than the large diameter portion 22 closer to the motor shaft 41 when the file fixing unit 5 is coupled to the motor unit 30. [ The large diameter portion 22 is larger in diameter than the small diameter portion 21 and relatively larger than the small diameter portion 21 so as to be further spaced from the motor shaft 41 when the file fixing unit 5 is engaged with the motor unit 30. [ Respectively.

The large diameter portion 22 is formed with a plurality of rotation preventing slits 22 having a width W into which the rotation preventing pin 37 is inserted and extending parallel to the rotation axis CL, ) 23 are formed. The plurality of anti-rotation slits 23 are formed at a constant angular interval IA, and the angular interval IA between the adjacent anti-rotation slits 23 may be between 1 and 20 degrees. If the angular interval IA is less than 1 DEG, it is difficult to ensure the width W at which the end of the anti-rotation fin 37 can be fitted, and the angular interval IA is too small, It is inconvenient to adjust the angle of the file fixing unit 5. On the other hand, if the angular interval IA is larger than 20 DEG, the angle interval IA is too wide to adjust the angle of the pawl fixing unit 5 with respect to the motor unit 30 to an angle that exactly matches the practitioner's taste. Meanwhile, although FIG. 3 shows an embodiment in which 30 slits 23 are formed along the outer peripheral surface of the large diameter portion 22, this is merely an example. For example, 24 or 18 slits may be formed.

The lower end 24, which is closer to the motor shaft 41 than the both ends in the longitudinal direction of the anti-rotation slit 23, is open. Therefore, when the fastening shaft 20 is fitted into the fastening shaft housing 33, the anti-rotation fin 37 enters the anti-rotation slit 23 through the lower end 24 of the anti-rotation slit 23 The rotation preventing pin 37 is pulled out of the rotation preventing slit 23 through the lower end 24 of the rotation preventing slit 23 even when the fastening shaft 20 is pulled out of the fastening shaft housing 33. [ 3, in the embodiment of the present invention, the rotation preventing slit 23 is formed in the entire outer peripheral surface of the large diameter portion 22, that is, in the entire region from 0 to 360 degrees about the rotation axis CL, However, the present invention is not limited thereto, and the rotation preventing slit may be formed in a part of the outer circumferential surface of the large diameter portion 22.

A ring-shaped groove is formed on the outer periphery of the fastening shaft 20 close to the crest portion 12 in the shape of a ring with a smaller diameter than the periphery, and a ring-shaped groove A locking spring 25 is fitted. When the file fixing unit 5 is coupled to the motor unit 30 and the fastening shaft 20 is fitted into the fastening shaft housing 33, the locking spring 25 contacts the inner surface of the fastening shaft housing 33 Pressed and resiliently restored. The locking spring 25 is brought into close contact with the inner surface of the locking shaft housing 33 on the outer side surface of the locking spring 25 and is prevented from being caught during the dental procedure or during operation by friction between the locking spring 25 and the inner side surface of the locking shaft housing 33 The fixed unit 5 is prevented from being inadvertently disengaged from the motor unit 30. [

An engaging jaw 35 is formed on the inner side surface of the fastening shaft housing 33, which is in close contact with the locking spring 25, so as to interfere with the locking spring 25, Therefore, the frictional force between the locking spring 25 and the fastening shaft housing 33 is further increased, thereby more reliably preventing the unintended disconnection of the pawl fixing unit 5 and the motor unit 30. The portion of the locking spring 25 which contacts the locking protrusion 35 of the locking spring 25 does not step against the locking protrusion 35 in spite of the locking protrusion 35, The operator grips the bag unit 12 of the pile fixing unit 5 and the motor unit 30 and pulls the pile unit in the opposite direction to force the locking spring 25 to resiliently restorable, And the motor unit 30 can be separated from each other.

According to the handpiece 1 of the present invention, the fitting angle of the file fixing unit 5 is set with respect to the motor unit 30 on the basis of the rotation axis CL, and the fastening shaft housing 33 is fastened to the fastening shaft The connector 16 and the motor shaft 41 are engaged and the rotation preventing pin 37 is inserted into one of the plurality of rotation preventing slots 23 to move the file fixing unit 5 ) Is fixed.

Generally, when the handpiece 1 is viewed from the rear, the file fixing unit 5 (see FIG. 4) is arranged so that the inclined axis PL of the file fixing unit 5 overlaps the rotation axis CL as shown by the solid line in FIG. ) Is set. However, when the handpiece 1 is viewed from the back according to the personal preference of the dental practitioner, the inclination axis PL of the file fixing unit 5 with respect to the rotation axis CL is shifted to the right side Or the inclination angle of the file fixing unit 5 to the left. The maximum angle RSA at which the inclination axis PL of the file fixing unit 5 can be tilted to the right and the maximum angle LSA at which the inclination axis PL can be inclined to the left, (PL) is inclined with respect to the rotation axis CL.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true protection of the present invention should be determined only after the appellate patent office attached.

1: Handpiece 2: File
5: File fixing unit 16: Motor shaft connector
20: fastening shaft 23: anti-rotation slit
25: locking spring 30: motor unit
40: Electric motor 41: Motor shaft
33: fastening shaft housing 37: anti-rotation pin

Claims

A motor unit having a motor and a motor shaft rotated by the motor; And
And a file fixing unit having a power transmission shaft connected to the motor shaft and fixing and rotating the work file,
The motor unit comprising: a fastening shaft housing coupled to the front of the motor and configured to surround the motor shaft; And a rotation preventing pin protruding inward from a central portion of the coupling shaft housing,
Wherein the pawl fixing unit includes a fastening shaft which surrounds a part of the power transmitting shaft and is fitted in the fastening shaft housing,
A plurality of anti-rotation slits extending in parallel to each other in a direction parallel to a rotation axis of the motor shaft, the anti-rotation slits having a width at which the ends of the anti-rotation fins are fitted, And a locking spring that is tightly engaged with the engaging jaw of the fastening shaft housing and is biased elastically biased outward.

The method according to claim 1,
Wherein the plurality of anti-rotation slits are formed at intervals of 1 to 20 degrees.

The method according to claim 1,
Wherein one end of each of the longitudinally opposite ends of the anti-rotation slit closer to the motor shaft is opened to allow the anti-rotation fin to enter and withdraw from the anti-rotation slit.

The method of claim 3,
Wherein the fastening shaft includes a small diameter portion that is relatively closer to the motor shaft, a large diameter portion that is larger in diameter than the small diameter portion, is further away from the motor shaft than the small diameter portion, peace.

5. The method of claim 4,
Wherein the locking spring is disposed to surround the large diameter portion adjacent to the rotation preventing slit and has a shape in which both ends are rounded without contacting each other,
Wherein the locking spring is brought into close contact with the inner surface of the fastening shaft housing to prevent unintentional separation of the pawl fixing unit and the motor unit.

6. The method of claim 5,
Wherein the engaging jaw has a stepped shape so as to interfere with the locking spring on an inner surface of the fastening shaft housing.

The method according to claim 1,
Wherein a distal end of the anti-rotation fin is convex curved.