KR102106013B1 - Handpiece for dental - Google Patents

Abstract

The present invention relates to a dental handpiece, and more particularly, to a dental handpiece for allowing a rotation of a motor to be mechanically converted to a linear movement to generate a vibration, to prevent heat from generating, prevent a malfunction from generating, and prevent the vibration from stopping even when force is applied to an affected part of a tooth, thereby improving a reliability. According to a dental handpiece (1000) of the present invention, a tooth extraction device (1700) for allowing a blade for tooth extraction to be selectively inserted and fastened to a cap fastened to one end of an upper case, and having a cam installed to reciprocate in an axial direction by operation of a driving unit includes: a cap (1710) fastened to one end of the upper case (1100), a first bearing (1720) installed to a lower case installed to guide the blade after inserted to the other end of the upper case; a connection shaft member (1730) fitted to an axial center of the lower case; a cam cover (1740) fastened to a side of the driving unit and fitted from the other end of the lower case; a spring (1750) assembled in an axial center direction of the cam cover from the driving unit; a camshaft (1760) fixed to the connection shaft member in a state of protruding through an end of the cam cover toward the first bearing while being inserted into an axial center of the spring to reciprocate in an axial central direction; and a cam (1770) assembled to a motor rotating shaft 1510 of the driving unit, and arranged at an axial center of the cam cover toward the driving unit to come into contact with a camshaft upon synchronous rotation with the motor rotating shaft so as to press the camshaft around the shaft.

Description

Dental handpiece {Handpiece for dental}

The present invention relates to a dental handpiece, and more particularly, to a dental handpiece that can be used when extracting a tooth.

In general, the handpiece is used for work that can be precisely performed by the user by hand, and when the tooth of the human body is extracted from the dental clinic, the tip of the blade, which is a contact projecting from the case tip of the handpiece, is flat (扁平) (To function as an elevator), the operator strongly inserts the flat tip into the part of the root film, cuts the root film and manipulates the tooth to detach from the alveolar bone.

In the meantime, the ultrasonic vibration is continued to the vibrator, and the ultrasonic vibration is transmitted to the tooth displacement through the contactor, thereby obtaining an anesthetic effect.

For example, in the case of extraction or removal of a prosthesis, the amplitude of the vibrator decreases and the ultrasonic vibration is often stopped when the operator applies force.

At this time, when the ultrasonic vibration is stopped, the anesthesia effect is lost, so it is not preferable because the patient has pain, and furthermore, the extraction or prosthesis removal operation is stopped.

In this way, the ultrasonic vibration is stopped. A sensor that detects when the amplitude of the ultrasonic vibration decreases due to excessive force acting on the mechanical anesthesia and affected area separation device, and the ultrasonic oscillator operates according to the signal from the sensor. It was configured to stop, causing problems.

In order to solve this problem, the Korean Patent Office has disclosed the name "mechanical anesthesia and affected area separation device" of Korean Patent Publication No. 10-2002-0071932, an ultrasonic vibration oscillator that oscillates ultrasonic vibrations having a frequency of 20 to 100 KHz. Wow; A low frequency oscillator; An ultrasonic vibrator vibrating at an ultrasonic frequency by an ultrasonic vibrator; A low frequency vibrator vibrating at a low frequency by a low frequency oscillator; And a hand piece having an affected part contactor connected to both oscillators. In an operating state in which only an ultrasonic oscillator is operated to perform mechanical anesthesia by vibrating only an ultrasonic vibrator, the low frequency oscillator is also vibrated in addition to the ultrasonic vibration of the ultrasonic oscillator to obtain a modulating operating state that promotes mechanical anesthesia and separation of the affected part. It has a structure with operating means for operating the oscillator.

Therefore, in the operating state in which only the ultrasonic oscillator is operated to perform mechanical anesthesia by vibrating only the ultrasonic vibrator, a modulating operating state in which the low frequency vibrator is also vibrated in addition to the ultrasonic vibration of the ultrasonic vibrator can be obtained. When the situation is not predicted, the low frequency vibrator is vibrated to facilitate separation of the affected area, and separation of the affected area can be reliably performed without stopping the ultrasonic vibration of the affected area contact as in the prior art without applying a large force to the affected area.

However, such dental handpieces are equipped with an ultrasonic oscillator and a low-frequency oscillator composed of electronic control, and an electronic oscillator and an oscillator composed of an ultrasonic oscillator and a low-frequency oscillator, which generate a lot of heat in a circuit and have a problem of malfunction.

In addition, since each of these ultrasonic vibration oscillators, low frequency vibration oscillators, and ultrasonic oscillators and low frequency oscillators is used, there is a problem in that the vibration is stopped when the tooth is extracted by applying a force to the affected area of the tooth and putting the blade deep into the tooth.

Reference: Korean Patent Office Publication No. 10-2002-0071932 The title of the invention "mechanical anesthesia and lesion separation device".

The present invention has been devised to solve the above-mentioned problems. For vibration, the vibration is generated while mechanically linearly rotating the motor to generate vibration. The purpose is to provide a handpiece.

An object of the present invention is to provide a dental handpiece having excellent reliability because mechanical rotation is performed by mechanically changing the rotation to a linear motion so that it is not stopped even when a force is applied to the affected area of the tooth.

Dental handpiece according to the present invention for achieving the above object, the upper case, and the lower case is fastened to be sealed so that one end is inserted into the shaft in the upper case, and installed on the other end of the lower case to power A jack case that can be supplied, a control unit that is connected to the jack case to control the supply of power, and a driving unit that is inserted into the shaft center of the lower case so that power can be selectively rotated by the control unit, The motor fixing cap is fastened to the shaft center of the lower case and the cap to be fastened to one end of the upper case is selectively fitted with a blade for tooth extraction so as not to fall out in the axial direction. Including the extraction means installed to be able to reciprocate in the axial direction, the extraction means, one end of the upper case From the shaft, it is inserted into the cap catching jaw and fastened, and the cap can be guided by inserting the blade into the shaft center, and is inserted into the shaft center of one end of the lower case and fixed to the other end of the upper case to guide the blade. The first bearing installed so as to be able to be connected to the shaft center of the lower case while the blade and the camshaft are fastened and disposed inside the first bearing to be moved in the axial direction and a shaft on the side of the driving unit While being fastened and fixed to the center, the cam cover assembled by being inserted into the shaft center from the other end of the lower case, the spring assembled by being inserted into the shaft center direction of the cam cover from the driving part, and inserted into the shaft center of the spring from the drive part, into the shaft center direction It is assembled to reciprocate, and at the end of the cam cover towards the first bearing. The camshaft protruded in a through state and fixed to the connecting shaft member, and is assembled to the motor shaft of the driving part, and disposed at the shaft center of the driving part of the cam cover to contact the camshaft when synchronously rotating with the motor shaft, thereby rotating the camshaft. It characterized in that it is made of a cam that can be pressurized.

Here, the spring is inserted into the shaft center of the cap while the driving unit is operating, so that the camshaft can be reciprocated to the shaft center only when a constant force or more is continuously applied toward the driving unit to the blade fastened with the connecting shaft member. It is characterized by.

And the cam, one end is provided with a cam surface having an inclined surface inclined at a constant angle with respect to the shaft center, and the other end, the motor rotation shaft assembly hole is formed so that the motor rotation shaft of the driving unit is assembled in the axis center direction, and at the outer circumferential surface It characterized in that the screw portion is formed to be fixed to the motor rotating shaft by a fastening screw.

In addition, an O-ring installation groove is formed on an outer circumferential surface of one end of the lower case, an O-ring is seated in the O-ring installation groove, and the O-ring is fitted toward the other end of the upper case to be sealed at a predetermined position on the inner circumferential surface of the upper case. .

On the other hand, a screw portion is formed in the axial center direction on the outer circumferential surface of the other end of the upper case, and the head portion is fastened with the screw portion, and the upper case and the lower case are fastened in close contact with the axial center. When fastened to the axis center of the lower case, it is characterized in that the state in which the lower case is fastened in the axial direction is not released by this tanning bolt.

As described above, according to the dental handpiece according to the present invention, the vibration is caused to generate vibration while mechanically linearly rotating the motor, so that not only heat is not generated but also malfunction is not generated. .

According to the dental handpiece according to the present invention, since the rotation of the motor is mechanically changed to a linear motion, it is operated, and even when a force is applied to the affected area of the tooth, it is not stopped and thus reliability is excellent.

1 is a perspective view of a dental handpiece according to an embodiment of the present invention,
Figure 2 is a front view of Figure 1,
3 is a left side view of FIG. 1,
4 is a right side view of FIG. 1,
5 is a plan view of FIG. 1,
Figure 6 is a bottom view of Figure 1,
7 is an explanatory view showing a state in which the blade is inserted into the top cap in FIG. 1;
8 is a cross-sectional view taken along line A-A in FIG. 7;
9 is a front view showing the upper case of FIG. 8,
10 is a sectional view taken along line B-B in FIG. 9,
11 is a plan view showing the lower case of FIG. 8,
12 is a right side view of FIG. 11,
13 is a sectional view taken along line C-C of FIG. 12,
Figure 14 is a front view of the blade used to fit in the top cap of Figure 8,
15 is a front view showing the top cap of FIG. 8,
16 is a left side view of FIG. 15,
Figure 17 is a longitudinal sectional view showing the bearing for the blade guide of Figure 8,
18 is a front sectional view showing the connecting shaft of FIG. 8,
19 is a perspective view showing the cam cover of FIG. 8,
20 is a plan view of FIG. 19,
21 is a bottom view of FIG. 19,
22 is a cross-sectional view taken along line D-D of FIG. 20;
23 is a sectional view taken along line E-E in FIG. 20;
24 is a front view showing the camshaft of FIG. 8,
25 is a right side view of FIG. 24,
26 is a longitudinal sectional view showing the cam of FIG. 8,
27 is a front view showing the motor nut of FIG. 8,
28 is a side view of FIG. 27;
29 is a longitudinal sectional view showing the jack case of FIG. 8.

Hereinafter, a dental handpiece according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In adding the quotation marks to the components of the drawings, the same components have the same reference numerals as possible even though they are displayed on different drawings, and a known function determined to unnecessarily obscure the subject matter of the present invention And detailed description of the configuration is omitted. In addition, directional terms such as 'top', 'bottom', 'front', 'back', 'tip', 'front', 'end' and the like are used in connection with the orientation of the disclosed drawing (s). Since the components of the embodiments of the present invention can be positioned in various orientations, the directional terms are used for illustration purposes and are not limiting.

Referring to Figures 1 to 8 for the dental handpiece 1000 according to an embodiment of the present invention, the upper case 1100, and the lower end is fastened to be sealed by being fitted into the shaft in one end to the upper case The case 1200, a jack case 1300 installed at the other end of the lower case to supply power, a control unit 1400 connected to the jack case to control the supply of power, and the control unit The power supply is supplied by the drive unit 1500 fitted to the shaft center of the lower case so that it can be selectively rotated, and the motor fixing cap 1600 fastened to the shaft center of the lower case so that the driving unit does not fall out in the axial direction, and The foot (2000) is installed to allow the cam to move reciprocally in the axial direction by the operation of the driving part while selectively inserting and fastening the blade (2000) for tooth extraction on the cap (1710) that is fastened to one end of the upper case. Includes dimensional stage 1700.

Therefore, the rotation of the motor 1500 is connected to the motor shaft by the fixed cam and the cam shaft reciprocating in the shaft center direction by the cam to generate vibration, and not only heat is not generated, but malfunction does not occur. Of course, the motor rotation is mechanically changed to a linear motion, so that it is not stopped even when a force is applied to the affected area of the tooth, so reliability is excellent.

Here, the extraction means 1700, as shown in FIGS. 7 to 29, is coupled to the shaft engaging shaft 1110 from the one end of the upper case 1100 and fastened to the cap engaging jaw 1101 and the blade (2000) ) To be guided by inserting the cap 1710 and the first bearing 1720 installed to guide the blade by being inserted into the other end of the upper case in a fixed state by being inserted into the center of one end of the lower case 1200 And, while the blade and the camshaft to be described later is fastened, it is inserted into the shaft center of the lower case, and one end is disposed inside the first bearing to move in the axial direction. While being fastened and fixed to the center, the cam cover 1740 assembled by being inserted into the shaft center from the other end of the lower case, and the spring 1750 assembled by being inserted into the shaft center direction of the cam cover by the driving part The camshaft (1760) fixed to the connecting shaft member protruding from the end of the cam cover toward the first bearing and being assembled to be reciprocated in the shaft center direction by being fitted into the shaft center of the spring at the driving part side, In addition to being assembled to the motor rotation shaft 1510 of the driving unit, the cam 1770 is arranged at the shaft center side of the driving unit side of the cam cover and is in contact with the cam shaft during synchronous rotation with the motor rotation shaft to press the cam shaft to the shaft center. It is characterized by.

Accordingly, when the power supply jack is connected to the jack case 1300, the control unit 1400 is operated to drive the driving unit 1500, and when the blade 2000 is pressed to the patient's affected area, the motor rotation shaft 1510 of the driving unit The cam shaft 1760 accommodated in the cam cover 1740 while the fixed cam 1770 rotates is reciprocally moved to the center of the shaft with a spring 1750 to provide extraction. Is done.

In addition, the spring 1750 is inserted into the shaft center of the cap 1710 in the state where the driving unit 1500 is operating, and has a certain force toward the driving unit 1500 toward the blade 2000 fastened with the connecting shaft member 1730. The length and spring wire diameter are selected and used so that the camshaft 1760 can be reciprocated to the axis center only when is continuously applied.

Therefore, even if the driving unit 1500 is operated by the spring 1750, if the handpiece 1000 for the dental is held and the force is not applied to the blade 2000 in the axial direction, vibration does not occur. You can prevent it.

In addition, the cam 1770, one end is provided with a cam surface (1771) having an inclined surface inclined at a constant angle with respect to the shaft center, the other side of the motor rotation shaft 1510 of the drive unit 1500 is assembled in the axis center direction It is characterized in that the motor rotating shaft assembly hole 1772 is formed to be possible, and a screw portion 1773 that is fixed to the motor rotating shaft 1510 by a tandem screw 1800 that is fastened on the outer circumferential surface is formed.

Therefore, when the endless screw 1800 is fastened to the motor rotational shaft 1510 fitted into the motor rotational shaft assembly hole 1772 by fastening the screwless screw 1800 with the screw portion 1773, the cam 1770 is connected to the motor rotational shaft ( It does not move to the axis center of 1510).

On the other hand, an O-ring installation groove 1201 is formed on one outer circumferential surface of the lower case 1200, and an O-ring 1900 is seated on the O-ring installation groove, and the O-ring is inserted toward the other end of the upper case and the inner circumferential surface of the upper case It is sealed at a predetermined position.

Therefore, sealing is made in the assembly portion of the lower case 1200 and the upper case 1100 by the O-ring 1900, thereby preventing penetration of moisture or the like.

In addition, a screw portion 1102 is formed in an axial center direction on the outer circumferential surface of the other end of the upper case 1100, and a bolt 1801 is fastened to the screw portion 1102, and the upper case and the lower case are axially centered. In a state of being fastened in close contact, when the tanning bolt 1801 is fastened to the axis center of the lower case, the state in which the lower case 1200 is fastened in the axial direction by the tanning bolt 1801 is not released.

Hereinafter, each component according to an embodiment of the dental handpiece of the present invention will be described in more detail.

Here, the upper case 1100, as shown in FIGS. 8 to 10, is formed in the center of the shaft, the bearing fitting hole 1110 into which the first bearing 1720 is fitted, and the bearing fitting hole at one end of the shaft center ( 1110), a cap fastening screw portion 1120 formed with a certain length so that the cap 1710 is fastened and seated, and a bearing seating boss receiving portion 1130 formed with a certain length to be enlarged in the bearing fitting hole to accommodate the bearing seating boss portion. Wow, this bearing seating boss is enlarged in the threaded portion 1140 formed to a certain length so as to be screwed with the lower case 1200 and the threaded portion is enlarged in the threaded portion, the outer peripheral surface of one end of the lower case 1200 The O-ring 1900 fitted in the O-ring installation groove 1201 formed in the O-ring sealing unit 1150 is sealed in close contact with the O-ring sealing unit, and the lower case assembly unit 1160 is enlarged and communicated to the other end.

The screw portion 1102 formed on the outer circumferential surface of the other end of the upper case 1100 is formed to be positioned as the lower case assembly portion 1160.

And the lower case 1200, as shown in Figures 8 and 11 to 13, the outer peripheral surface of the bearing boss 1210 from one end side, and expanded from the bearing boss screw forming portion of the upper case (1140) ) And a screw portion 1220 formed of a predetermined length to be fastened, and expanded from the screw portion, the O-ring installation groove 1201 formed so that the O-ring 1900 is seated on an outer circumferential surface of the lower case 1200, and the O-ring The upper case fitting assembly 1230 formed to be enlarged from the installation groove and assembled with the upper case, and the power switch button installation groove 1240 of the control unit 1400 at the other end, and a position adjacent to the power switch button installation groove It is formed in the display hole (1241) for displaying the operating speed, the other end of the shaft center is formed with a certain length of the drive unit receiving groove (1250) is fitted so that the drive unit 1500, and at a predetermined position of the drive unit receiving groove At a constant length The drive motor fixed fastening screw portion 1251 formed while being expanded and screwed, and the jack case assembly 1260 formed by being enlarged from the drive motor fixed fastening screw portion and extending to the end of the other end so that the jack case 1300 is fitted and coupled A screw cover 1261 formed through the outer circumferential surface of the other end to the jack case assembly and formed so that the tanned bolt 1802 is fastened, and the cam cover formed to be stepped so that the cam cover 1740 is seated by being reduced to one end in the drive part receiving groove The seating portion 1270, the connecting shaft receiving portion 1280 that is reduced in diameter from the cam cover seating portion to accommodate the first bearing, and the cap 1710 at one end of the lower case 1200 are fastened. In addition, it is composed of a cap assembly screw portion 1290 formed at a certain length at the center of the shaft to communicate with the bearing receiving portion.

In addition, the jack case 1300, as shown in FIGS. 8 and 29, is formed at the center of the shaft to the adapter 1410 of the control unit 1400 is fastened to the screw portion 1310 and the screw case, the lower case 1200 ), The adapter receiving groove 1320 is formed to accommodate the adapter 1410 is enlarged to the side, and the power jack receiving groove 1330 formed to be connected to the power jack is formed on the opposite side of the adapter receiving groove in the screw portion 1310, and A locking groove 1340 formed on an outer circumferential surface to be fitted to the lower case 1200 is provided so that the tanned bolt 1802 fastened to the screw portion 1261 of the lower case is seated in the locking groove 1340 so that the jack case 1300 is lowered. It is assembled so as not to fall out of the case 1200.

On the other hand, the control unit 1400, as shown in FIGS. 1 to 13, the adapter 1410 screwed to the center of the shaft of the jack case 1300, and the inner peripheral surface of the other end of the lower case 1200 It is made of a substrate 1420 on which a power on / off switch 1422 and a speed display lamp 1423 are installed to enable power on / off while being connected to an adapter.

Therefore, the power is supplied to the adapter 1410, and the power on / off switch 1422 is pressed to display the rotation speed with the speed indicator lamp 1423.

In addition, the driving unit 1500, as shown in Figure 8, consists of a motor and a motor rotating shaft 1510, the motor case of the motor screw the cam cover 1740 at a position adjacent to the motor rotating shaft 1510 A screw portion for fixing with a member is formed.

In addition, the motor fixing cap 1600, as shown in FIGS. 8 and 27 and 28, the through-hole 1610 formed in the center of the shaft, a certain diameter than the through-hole is expanded to the lower case 1200 The motor fixing screw part 1620 which is engaged with the motor fixing cap fastening screw part 1251 of the motor, and the motor pressing part 1630 that is reduced in diameter at the motor fixing screw part to press the side surface of the driving part 1500, and the motor fixing part It is formed on the side of the screw portion is provided with a rotation groove 1640 to facilitate rotation.

Here, the cap 1710, as shown in FIGS. 8 and 15 and 16, the blade guide hole 1711 formed through the center of the shaft to guide the blade 2000, and the upper case ( The cap fastening part 1712 formed to be fastened to the cap fastening screw part 1120 of 1100), and the rotation handle part 1713 configured to be caught and rotated on the side of the side where the blade 2000 flows in are formed. have.

Therefore, when holding the rotation handle portion 1713 and assembling the cap 1710 with the cap fastening portion 1712 in the cap fastening screw portion 1120 of the upper case 1100, the blade 2000 is the blade guide hole Guided to (1711) is accommodated in the center of the axis of the upper case (1100).

And the connecting shaft member 1730, as shown in Figures 8 and 18, one end having an outer diameter to be fitted to the bearing 1720, the screw portion of the blade 2000 is fastened to the screw center (1731a) ) Is formed with a blade fastening portion (1731) is provided, the other end of the camshaft fitting hole (1732a) is formed into the camshaft (1760) is fitted to the center of the shaft, and the screw portion (1732b) penetrated from the outer peripheral surface to the camshaft fitting hole ) Is provided with a cam shaft connection (1732).

Therefore, the blade 2000 can be connected to the screw portion 1173a, the shaft portion of the camshaft 1760 is inserted into the camshaft fitting hole 1732a, and the head shaft 1730a is fastened with the screw portion 1732b to tighten the camshaft ( 1760) is to move synchronously in the axial direction without falling off.

In addition, the cam cover 1740, as shown in FIGS. 8 and 19 to 23, a disc-shaped base 1741 and a long hole guide portion protruding in a long hole shape while having a certain length on one side of the base 1742), and the spring receiving portion (1743) formed to protrude to a certain length with the same diameter as the width of the long hole guide portion from the shaft center of the long hole guide portion, and protrudes integrally on both sides in the width direction of the long hole guide portion and penetrates parallel to the axis center A hole 1744a is formed so that the motor assembly 1744 is formed to be assembled with the driving unit 1500, and a certain length is formed at the end of the spring receiving portion 1743 to the center of the shaft, so that the shaft portion of the camshaft 1760 A camshaft shaft fitting hole (1745) fitted to be moved in the axial direction, a spring receiving groove (1746) formed to accommodate a spring that is enlarged from the camshaft shaft fitting hole (1745) and causes vibration, and the base (174 On the other side of 1), the camshaft guide groove 1747 formed of a long hole of a certain depth narrower than the width of the long hole guide portion 1742 in a narrower and longer length than the spring receiving groove 1746, and the base 1174 ), The cam receiving groove 1748 formed at a predetermined depth to accommodate the cam 1770 in a state in which the diameter is larger than the spring receiving groove 1746 from the other side of the shaft.

Therefore, the cam cover 1740 is fitted into the through-hole 1744a using a screw (not shown) to be assembled in the motor case of the driving unit 1500, and thus the cam cover 1740 is assembled to the driving unit 1500 Furnace to be accommodated by the cam cover seating portion 1270 and the connecting shaft receiving portion 1280 of the lower case 1200, the cam receiving groove 1748, the cam shaft guide groove 1747 and the spring receiving groove 1746 As the spring 1750 accommodated by the camshaft shaft 1760 and the camshaft 1760 fitted into the camshaft shaft 1745, the cam 1770 rotates when the cam 1770 rotates and the press force transmitted from the blade 2000 is applied. By reciprocating in the axial direction, tooth extraction is mechanically possible.

In addition, as described above, the spring 1750, in the state in which the driving unit 1500 is operating, is inserted into the shaft center of the cap 1710, the driving unit to the blade 2000 fastened with the connecting shaft member 1730 Select and use the spring length and spring wire diameter so that the blade 2000 fastened with the connecting shaft member 1730 moves reciprocally to the axis center of the camshaft 1760 only when a constant force or more is continuously applied toward (1500). Is done.

Therefore, even if the driving unit 1500 is operated by the spring 1750, if the handpiece 1000 for the dental is held and the force is not applied to the blade 2000 in the axial direction, vibration does not occur. You can prevent it.

On the other hand, the cam shaft 1760, as shown in FIGS. 8 and 24 and 26, the cam receiving groove 1748, the cam shaft guide groove 1747 and the spring fitted into the spring receiving groove 1746 ( 1750) and a camshaft portion 1801 fitted into the camshaft shaft fitting hole 1745, and a cam guide portion formed in a long hole shape having the same length in both directions wider than the diameter of the camshaft portion at the center of one end of the camshaft portion (1762), and the other side of the cam guide portion 1762, and the cloud contact portion protruding in a hemispherical shape at a position spaced a certain distance from the center of the axis of the cam shaft portion 1761, to make point contact with the cam 1770 (1763).

Therefore, when the cam 1770 is rotated, it is in close contact with the rolling contact portion 1763 to press the rolling contact portion 1763 toward the blade 2000, and again, the driving unit 1500 by the cam surface 1711 of the cam 1770. As the pressing force of the spring 1750 toward the rolling contact portion 1763 is pressed, the cam guide portion 1762 and the cam shaft portion 1801 move reciprocally from the shaft center.

In addition, as described above, the cam 1770 has a cam surface 1771 having an inclined surface inclined at a constant angle with respect to the axis center, and a motor rotation shaft 1510 of the driving unit 1500 in the axis center direction. Since the screw 1800 is fastened to the motor rotation shaft assembly hole 1772 formed to be assembled and the screw portion 1773 formed on the outer circumferential surface of the cam 1770, and fixed to the motor rotation shaft 1510, the cam 1770 is a motor It will not move to the center of the axis of the rotating shaft 1510.

The embodiments described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the items described in the claims, and a person having ordinary knowledge in the technical field of the present invention can improve and modify the technical spirit of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention if it is apparent to those skilled in the art.

1000: dental handpiece 1100: upper case
1200: lower case 1300: jack case
1400: control unit 1500: drive unit
1600: Motor fixing cap 1700: Extraction means
1710: cap 1720: first bearing
1730: connecting shaft member 1740: cam cover
1750: Spring 1760: Camshaft
1770: Cam 2000: Blade

Claims (5)

The upper case, the lower case which is fastened so that one end is inserted into the upper case and sealed to the upper case, and the jack case installed at the other end of the lower case to supply power, and connected to the jack case to supply power. A control unit that can be controlled, a driving unit fitted to the shaft center of the lower case so that power can be selectively rotated by the control unit, and a motor fixed to the shaft center of the lower case so that the driving unit does not fall out in the axial direction In the dental handpiece comprising a cap and a tooth extraction means installed to reciprocate in the axial direction by the operation of the driving unit, while selectively inserting and fastening the blade for tooth extraction to the cap that is fastened to one end of the upper case. ,
The extraction means,
A cap that can be guided by inserting a blade into the shaft center while being fastened by being inserted into the cap catching jaw from one end of the upper case.
A first bearing installed to guide the blade by being inserted into the other end of the upper case in a fixed state by being fitted into one shaft center of the lower case,
As the blade and the camshaft are fastened, it is inserted into the shaft center of the lower case and is disposed inside the first bearing so that the connecting shaft member can be moved in the axial direction.
The cam cover is assembled by being fastened to the side of the driving unit and fixed to the shaft at the other end of the lower case while being fixed.
A spring assembled by being inserted in the axial center of the cam cover from the driving part,
The cam shaft fixed to the connecting shaft member protruding from the end of the cam cover toward the first bearing, as well as being assembled to be reciprocated in the axis center direction by being inserted into the shaft center of the spring at the driving unit side,
A hand for dental, characterized in that it is assembled to the motor rotation shaft of the drive unit and is disposed at the shaft center of the drive unit side of the cam cover and is in contact with the cam shaft during synchronous rotation with the motor rotation shaft to press the cam shaft to the shaft center. peace. According to claim 1,
The spring,
In the state in which the driving unit is operating, only when a certain force or more is continuously applied toward the driving unit to the blade which is inserted into the shaft center of the cap and fastened with the connecting shaft member, the blade which is engaged with the connecting shaft member at the shaft center of the camshaft Dental handpiece, characterized in that it has a spring length and a spring wire diameter to move the reciprocating. According to claim 1,
The cam,
One end is provided with a cam surface having an inclined surface inclined at a constant angle with respect to the shaft center, and at the other end, a motor rotation shaft assembly hole is formed to assemble the motor rotation shaft of the driving unit in the shaft center direction, and to the tanned screw fastened at the outer circumferential surface Dental handpiece, characterized in that the screw portion is formed to be fixed to the motor rotating shaft .. According to claim 1,
O-ring installation groove is formed on the outer peripheral surface of one end of the lower case,
The O-ring is installed in the O-ring installation groove,
The O-ring is inserted into the other end of the upper case, the dental handpiece, characterized in that the inner circumferential surface of the upper case is sealed at a predetermined position. According to claim 1,
On the outer circumferential surface of the other end of the upper case, a screw portion is formed in the axial center direction,
The tanning bolt is fastened to the screw portion,
When the upper case and the lower case are fastened in close contact with the axial center, when the tan bolt is fastened to the axis center of the lower case, the state in which the lower case is fastened in the axial direction by the tan bolt is not released. Characterized dental handpiece.

Images