KR101068462B1 - Dental handpiece with adjustable angle - Google Patents

Abstract

The present invention relates to a dental handpiece, which improves the convenience of use by allowing the operator to arbitrarily adjust the number of rotations of the handpiece during dental treatment or surgery, in particular the treatment tool mounted at the handpiece tip at right angles. By being able to be adjusted at an arbitrary angle in the bent state, the straight handpiece is a convenient procedure can be made even in areas where treatment and surgery is difficult.
As a means for solving the above problems, the present invention comprises a front cabinet and a rear cabinet in the cylindrical handle housing, and in the front cabinet, the vertical rotating power of the rotating body is transmitted in the front cabinet. A rotation converter for converting in the direction, and a rotation speed converter for increasing the horizontal rotation speed, and a 360 ° rotation of the tip housing is freely configured on the front of the rotation speed converter, and the horizontal rotational force is again applied to the tip of the tip housing. It is difficult to perform a procedure with a straight handpiece by installing an angle housing in which a device for converting vertically is installed, and mounting a required tool in the angle housing so that the tool mounted in the angle housing is bent vertically with respect to the handpiece. Make various treatments and surgeries convenient regardless of the site Of course, if necessary, the operator can arbitrarily adjust the number of rotations so that excessive rotational force is not transmitted to the tool fitted to the angle housing, and the support bar is adjustable in the rear cabinet of the handle housing so that the operator can use it conveniently. It can be adjusted and used.

Description

Dental handpiece with free angle adjustment {ANGLE REGULATABLE MANUAL HANDPIECE FOR DENTAL CLINIC}

The present invention relates to a dental handpiece, which improves the convenience of use by allowing the operator to arbitrarily adjust the number of rotations of the handpiece during dental treatment or surgery, in particular the treatment tool mounted at the handpiece tip at right angles. By being able to be adjusted at an arbitrary angle in the bent state, the straight handpiece is a convenient procedure can be made even in areas where treatment and surgery is difficult.

Handpiece is one of the dental instruments used widely in dental treatment, such as drilling the alveolar bone during implantation, implanting the implant into the perforated alveolar bone, or removing the nerve tissue in the tooth using a file when treating the root canal of the tooth. There are many kinds of products such as electric type and manual type.

In general, handpieces that are used are rotational power, which is expensive and not easily repaired, and in particular, accidentally cutting files that rotate at high speed during root canal treatment to remove nerve tissue in teeth. There was a problem such as being done.

In addition, a non-electric manual handpiece is provided, but the disadvantage of not only being inconvenient for manually rotating the tool mounted on the end of the handpiece, but also insufficient rotational force, does not meet the expectations of the operator.

In order to rectify these disadvantages, the inventor has filed a patent application No. 2010-2568, "Dental handpiece for dentistry."

In other words, in the construction of the manual handpiece, the rotating body is projected on the outer surface of the handle housing so that the operator can easily rotate the rotating body with the fingers, and the rotational direction change and the rotational direction installed in the handle housing by the rotation of the rotating body and The tool attached to the handle housing front end can be rotated at high speed through the speed increase converter, and it is convenient to operate the tool mounted on the handpiece manually without using electric power. Not only to improve, but also to prevent the cutting of the file during the root canal treatment, such as to have a safe procedure could be achieved.

However, the treatment tool that is attached to the front end of the handle housing, which constitutes the handpiece, consists of a straight line in parallel with the handle housing. In this case, the procedure tool was difficult to approach at a desired angle, so there were many difficulties in the procedure.

In addition, products are provided to bend the tool mounted on the handpiece tip in a vertical direction so that the procedure can be conveniently performed to the difficult part with a straight handpiece, but mainly applied to electric handpiece, manual handpiece In the case of the application was insignificant as well as the rotational force transmission was inconvenient to use.

In the present invention, in the construction of a dental manual handpiece in order to rectify the above-mentioned disadvantages, the surgical tool mounted at the tip of the manual handpiece is bent at a right angle from the tip housing, and the tip housing rotates 360 °. The straight handpiece can be adjusted to allow convenient treatment to all parts of the oral cavity that were difficult to perform, but to allow effective treatment to be achieved by allowing the operator to manually transmit the rotational force to the tool in an increased speed. In addition, in the process of removing the nerve tissue in the tooth for the root canal treatment, the operator can adjust the rotation speed of the file properly to prevent the cutting of the file, to ensure safe treatment and surgery.

As a means for solving the above problems, the present invention comprises a front cabinet and a rear cabinet in the cylindrical handle housing, and in the front cabinet, the vertical rotating power of the rotating body is transmitted in the front cabinet. A rotation converter for converting in the direction, and a rotation speed converter for increasing the horizontal rotation speed, and a 360 ° rotation of the tip housing is freely configured on the front of the rotation speed converter, and the horizontal rotational force is again applied to the tip of the tip housing. It is difficult to perform a procedure with a straight handpiece by installing an angle housing in which a device for converting vertically is installed, and mounting a required tool in the angle housing so that the tool mounted in the angle housing is bent vertically with respect to the handpiece. Make various treatments and surgeries convenient regardless of the site Of course, if necessary, the operator can arbitrarily adjust the number of rotations so that excessive rotational force is not transmitted to the tool fitted to the angle housing, and the support bar is adjustable in the rear cabinet of the handle housing so that the operator can use it conveniently. It can be adjusted and used.

The present invention comprises a dental manual handpiece, but the angle housing at the distal end of the tip housing configured in the handpiece, and the tool required for the tool holder configured in the angle housing to be mounted in a 90 ° upright state to install a conventional straight hand As a piece, a screw holder for orthodontic fixation is placed on the deep inside or the back of the gum, which is difficult to perform, or the tool holder can be easily operated without difficulty even during the root canal treatment of a large molar tooth located in the tooth. By effectively adjusting the number of rotations of the tool fitted in the effective treatment can be made.

1 is a cross-sectional view of the present invention
2: partially enlarged cross-sectional view of FIG. 1
3: partially enlarged view of FIG. 2
4: partially enlarged cross-sectional view of FIG. 1
5 is an exploded view of the cross-sectional state of the rotation converter device of the present invention
Figure 6 is an exploded view of the cross-sectional state of the rotation speed conversion device of the present invention
7 is an exploded perspective view of the tip housing portion of the present invention;
8 is an exploded cross-sectional view of the tip housing portion of the present invention.
9 is an enlarged cross-sectional view of the tip housing portion of the present invention.
10 is an exploded cross-sectional view of the length device portion of the present invention.
11: Perspective view of FIG. 10
12: Schematic perspective view of FIGS. 5 and 6
Figure 13 is a state diagram of gear engagement of the gearbox of the present invention.
14: perspective view of the present invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional configuration diagram of a dental manual handpiece 10 free to adjust the angle to be provided in the present invention, Figures 2 to 4 is a partial enlarged cross-sectional configuration diagram, the front storage room on the inner surface of the handle housing 20 Comprising (21) and the rear cabinet 22, the through hole 24 is drilled between the front and rear chamber 21, 22, the rotational speed converter (A) in the front cabinet 21 ), And the angle conversion device (B), the rear storage chamber 22 is provided with a length adjusting device (C), the configuration thereof will be described in more detail.

First, the rotation speed converting device A configured in the handle housing 20 converts the vertical rotational force in the horizontal direction and transmits the increased rotational force to the angle converting device B configured at the front, and the handle housing 20. The shaft hole 23 is drilled on one side of the center so as to be in communication with the front storage chamber 21, and the shaft rod support 30 is fitted to the inner surface of the front storage chamber 21.

The shaft rod support 30 constitutes a horizontal shaft hole 31 for horizontally passing through the shaft rod support 30 as shown in FIGS. 5 and 12, but the coupling protrusion 32 is formed on one side thereof, and the vertical shaft hole is formed on the upper surface thereof. The cutting surface 34 'on which the 33 is formed is configured.

Therefore, the coupling protrusion 32 of the shaft support 30 is fitted in the through hole 24 formed in the handle housing 20, but the vertical shaft hole 33 coincides with the shaft hole 23 of the handle housing 20. To be.

At this time, the vertical bevel gear (34) is positioned on the upper surface of the shaft support (30), and the tubular portion (35) of the vertical bevel gear (34) is fitted in the shaft hole (23) of the handle housing (20). The vertical shaft bar 37 is inserted into the fastening hole 36 of the 34, and the rotating body 38 is coupled to the vertical shaft bar 37.

In the above, the vertical shaft 37, the vertical bevel gear 34 and the rotating body 38 is integrally assembled through a fixing means such as a key and a key groove (not shown), so that when the rotating body 38 is rotated, the vertical shaft The vertical bevel gear 34 is rotated together with the rod 37.

The horizontal shaft hole (31) of the shaft support (30) is freely coupled to the horizontal shaft bar (39), the horizontal bevel gear (40) integrally coupled to the horizontal shaft bar (39) and vertical bevel gear (34) To the tooth coupling, the end of the horizontal shaft (39) is fitted with the coupling hole 42 of the rotating body 41, by being integrally coupled with the rotating body 41 to rotate with the horizontal shaft (39), Rotating the rotating body 38 coupled to the vertical shaft 37 causes the vertical bevel gear 34 and the horizontal bevel gear 40 to rotate, thus rotating the horizontal shaft 39 to rotate the rotating body 41. do.

The rotating plate 43 of the rotating body 41 is formed by drilling the support holes 44 at equal intervals, and each of the support holes 44 is coupled to the connecting shaft 45, the planetary shaft to the connecting shaft 45 A mandrel of the gear 46 and the connecting hole 48 of the rotating disc 47 are fitted to the end of the connecting shaft 45 passing through the planetary gear 46, so that the rotating disc 47 rotates. ) To rotate.

The rotating shaft bar 50 is loosely fitted into the through-hole 49 of the rotating disk 47, and then is axially coupled to rotate integrally with the sun gear 46 'coupled between the planetary gears 46. , The rotating shaft bar 50 penetrating the sun gear 46 'allows the rotation to fit freely in the coupling hole 42 formed in the rotating body 41.

The outer surface of the rotary disk 47 and the planetary gear 46 is coupled to the connecting pipe 53, the central portion of the inner surface of the connecting pipe 53 constitutes a ring gear 54, the ring gear 54 is connected to the connecting rod ( The gears 46 are fitted to the planetary gear 46 fitted to the gear 45, and the angle adjusting holes 55 are drilled at equal intervals at the distal end of the connector 53.

On the front of the rotating disc 47 is connected to the tip housing 60 constituting the angle conversion device (B) through a connecting ring 56, as shown in Figure 2 and 3, through the connecting ring 56 (53) The angle adjusting hole 55 drilled at the tip end is covered.

The angle conversion device B is configured as follows.

First, the configuration of the tip housing 60 connected through the connection ring 56 at the distal end of the connection pipe 53 is configured as follows.

That is, as shown in FIGS. 7 and 8, a shaft hole 61 is formed on the inner surface of the tip housing 60, a space 62 is formed on the front surface of the shaft hole 61, and a rotating shaft rod is formed on the shaft hole 61. 50 is loosely fitted to be coupled, the coupling portion 69 of the tip housing 60 to be fitted to the connecting pipe 53, the storage chamber 63 is symmetrically drilled side by side to adjust the angle of the connector 55 (55) And the ball spring 64 and the stop ball 65 in the cabinet chamber 63 to stop the stop ball 65 by the ball spring 64, stop ball 65 ) Is selectively coupled to the angle control hole (55) drilled at the distal end of the connecting pipe (53).

An angle gear 66 is inserted into the tip housing 60 so as to be engaged with the rotating shaft bar 50. Then, the fixing bolt 67 is screwed into the screw hole 68 to rotate the angle gear 66 to the rotating shaft bar 50. It is rotated integrally with, the front end of the tip housing 60 to which the angle gear 66 is coupled to fit the coupling portion 111 of the angle housing 110 to be fixed and coupled, the hollow configured in the angle housing 110 An angle housing cover 115 is coupled to the lower portion of the lower part 112 as shown in FIG. 9, and the angle housing cover 115 is configured to include an operating chamber 116 in which a through hole 118 and a step 117 are formed.

The locking jaw 121 is engaged with the step 117 of the angle housing cover 115 by inserting a push button 120 having a locking jaw 121 into the operation chamber 116 formed in the angle housing cover 115. Part of the push button 120 is configured to protrude to the outside through the through hole 118 of the angle housing cover 115, but the inlet portion 122 and the outwardly inclined surface 123 at the front end of the push button 120 ) Is configured.

The tool holder 100 is inserted into the hollow part 112 formed at the angle housing 110, and the coupling part 103 is formed at the lower end of the tool holder 100 by a plurality of cutouts 102. The inner surface of the binding piece 103 is configured such that the engaging protrusion 104 protrudes, and the inwardly inclined surface 105 is configured to be in contact with the outer inclined surface 123 of the pushbutton 120.

An upper end of the tool holder 100 constitutes a shaft tube 106, and the angle driving gear 107 is integrally rotated on the shaft tube 106 to engage with the angle gear 66 fitted to the rotary shaft bar 50. When the rotating shaft bar 50 is rotated by rotating the angle gear 66 and the gear driving gear 107 coupled thereto, the tool holder 100 is rotated by the rotation of the angle driving gear 107. On the hollow portion 112 of the angle housing 110 located at the upper end of the tool holder 100, the cover 109 is coupled to prevent the angle driving gear 107 fitted in the angle housing 110 from being exposed to the outside. .

The coupling of the tool T in the tool holder 100 configured in the angle housing 110 is as follows.

That is, when the push button 120 configured at the bottom of the angle housing 110 is pressed, the push button 120 is moved toward the tool holder 100, and thus the outwardly inclined surface 123 configured at the tip of the push button 120 is tooled. Since the inner surface is in contact with the inclined surface 105 of the holder 160, the binding piece 103 configured in the tool holder 100 is expanded by the cut-out portion 102.

When the tool T is inserted into the coupling hole 101 of the tool holder 100 in the above state, the tool T is inserted into the coupling hole 101 and the lower end thereof is inserted into the recess 122 of the push button 120. Contact with, and at the same time, the circular recess groove 108 formed at the bottom of the tool T stops at the position of the engaging protrusion 104 of the tool holder 100, and in this state, when the pushbutton 120 is released, the binding piece 103 Since the inner diameter is reduced while restoring), the push button 120 is restored by the inward and outward inclined surfaces 105 and 123, and at the same time, the engaging protrusion 104 of the binding piece 103 is elastically provided in the recess groove 108. While being fitted, the tool T is firmly bound to rotate integrally with the tool holder 100.

The length adjusting device C configured in the rear storage chamber 22 of the handle housing 20 is configured as follows.

The rear cabinet 22 of the handle housing 20 is configured in a rectangular shape, the square stopper 70 is coupled to the inside of the rectangular rear cabinet 22, but the angle stopper 70 has an internal inclined surface 71 on one side. Is configured, and the other side constitutes an internal thread 72, and the external thread 81 formed at the distal end of the support bar 80 is screwed to the internal thread 72 of the square stopper 70, An outer inclined surface 82 is formed at the rear end of the outer screw 81 to be in contact with the inner inclined surface 71 of the square stopper 70.

The stop bolt (83) is screwed to the tip of the support bar (80) so that the square stopper (70) fitted to the external screw (81) of the support bar (80) prevents the separation from the support bar (80) and handle housing. A stop ring 84 is fitted at the entrance of the rear storage chamber 22 to prevent separation of the support bar 80 from the rear storage chamber 22, and a pressing part 85 at the end of the support bar 80. Is to be formed.

Manual handpiece 10 of the present invention configured as described above is a tool necessary for treatment and surgery in the angle conversion device (B), that is, angle housing 110 configured at the distal end of the handle housing 20 during dental treatment and surgery (root canal Therapeutic piles, implants, orthodontic screw tips, drills for drilling the alveolar bone, etc.) are bent in a vertical direction with respect to the handle housing 20. In or deep inside the screw is placed for orthodontic treatment, or canal treatment using a large molar tooth pile located inside the dentition can be conveniently treated and surgery.

First, the means for coupling the tool T in the angle housing 110 will be described once more.

First, as shown in FIGS. 7 to 9, the tool T having the circular recessed groove 108 formed at the bottom thereof is positioned at the coupling hole 101 of the tool holder 100 positioned on the inner side of the angle housing 110. When pressing 120, the outwardly inclined surface 123 formed at the tip of the pushbutton 120 enters into the inwardly inclined surface 105 of the binding piece 103 formed at the bottom of the tool holder 100, and is bound by the incision 102. The inner diameter of the piece 103 is expanded.

In the above state, when the tool T is strongly pushed into the tool holder 100, the lower end of the tool T is positioned in the recess 102 formed in the pushbutton 120, and the lower end of the tool T is configured at the lower end of the tool T. The circular recess groove 108 is positioned on the engaging protrusion 104 of the tool holder 100. When the external force is removed from the push button 120 in this state, the push button is pushed by the inward and outward inclined surfaces 105 and 123. Since the 120 is reversed and retracted, as the binding piece 103 whose inner diameter is expanded is reduced, the engaging protrusion 104 supports the recessed groove 108 located at the bottom of the tool T, and thus the tool T. Is integrally fastened in the tool holder 100.

When the tool (T) is completed as described above is used to adjust the length of the support bar 80 appropriately by using the length adjusting device (C) configured on the back of the handle housing 20.

At this time, the length adjustment of the support bar 80 is to rotate the support bar 80 in the counterclockwise direction, that is, to one side to move outward from the inclined stopper 70 of the square stopper 70 from the outer inclined surface 82 of the support bar 80. Since the inner inclined surface 71 is separated, the outer diameter of the expanded square stopper 70 is reduced, and the length of the support bar 80 from the handle housing 20 is pushed or pulled by the support bar 80 in the above state. To be adjusted.

When the length of the support bar 80 is set, the support bar 80 is rotated clockwise, that is, in the other direction, so that the support bar 80 is formed by the external screw 81 and the internal screw 72 of the square stopper 70. When the forward movement moves the inner inclined surface 71 of the square stopper 70 to the outer side by the outer inclined surface 82 of the support bar 80, the outer diameter portion of the square stopper 70 is the inner wall of the rear cabinet 22 Since it is in close contact with the support bar 80 is firmly fixed without moving.

As described above, the coupling of the tool T to the manual handpiece 10 is completed, and when the length adjustment of the support bar 80 is completed, the tool T is rotated to perform the necessary treatment and surgery on the teeth.

Manual rotation of the tool T coupled to the manual handpiece 10 is as follows.

That is, when the rotating body 38 protruding from the center of the handle housing 20 is rotated, the rotational force increased by the ring gear 54, the planetary gear 46, and the sun gear 46 ′ is transmitted to the tool T.

In more detail, when the rotating body 38 is rotated, the vertical bevel gear 34 coupled to the vertical shaft 37 rotates, and thus the horizontal bevel gear 40 and the horizontal shaft 39 and the rotating body (34) engaged thereto are rotated. 41 rotates, and when the rotating body 41 rotates, the planetary gear 46 fitted to the connecting shaft 45 of the rotating body 41 moves along the rotating body 41.

When the planetary gear 46 moves along the rotary body 41 as described above, the planetary gear 46 geared to the ring gear 54 rotates the connecting shaft 45 around the shaft, thus the planetary gear 46. The sun gear 46 'coupled with the gear is rotated.

At this time, the number of gears of the ring gear 54 is about four times the number of the planetary gears 46. When the rotor 41 rotates one turn, the connecting shaft 45 supporting the planetary gears 46 also rotates. ), But the planetary gear 46 fitted to the connecting shaft 41 is rotated four wheels, and the planetary gear 46 and the gears sun gear 46 'coupled to the gear 4 is also rotated four times to rotate the number of revolutions 4 It is doubled.

When the sun gear 46 'is rotated at an increased speed, the rotating shaft bar 50 integrally coupled is rotated. When the rotating shaft bar 50 rotates, the tool holder 100 configured at the tip of the tip housing 60 is rotated. Since the rotation of the tool (T) is to increase the speed.

The speed increase rate of the rotational force may be arbitrarily adjusted by adjusting gear ratios of the ring gear 54, the planetary gear 46, and the sun gear 46 ′.

Therefore, by using the increased rotational force to orthodontic screw is placed in the alveolar bone, the drilling work for the implant procedure, implantation in the perforated site, or root canal treatment to remove the nerve tissue of the tooth using a flexible pile And so on.

In particular, in the manual handpiece 10 to be provided in the present invention, the tip housing 60 configured at the tip of the handle housing 40 is freely rotated 360 °, and the angle housing 110 configured at the tip of the tip housing 60 is freely formed. When the tool (T) is assembled at a 90 ° bend on the), and the screw is placed for orthodontics, the screw is placed in the area that is difficult to use as a straight manual handpiece, that is, deep inside or behind the gum. In the root canal treatment of large molar teeth located inside the teeth.

In other words, the tool holder 100 is erected in a state where the tip housing 60 is bent at 90 ° to the tip housing 60. When the tool T is coupled to the tool holder 100, the tool T is removed from the tip housing 60. Since the 90 ° upright state is maintained, the tool (T) is easily accessible when the orthodontic screw is to be placed deep in the oral cavity of the gum or the back alveolar bone of the gum, so that the orthodontic screw is conveniently placed. Not only can be used, even if you want to treat the root canal using a large molars file located in the inner side of the dental dentition can be easily removed using the pile upright installed in the tool holder 100.

In addition, the angle housing 110 supporting the tool holder 100 is rotated 360 ° through the tip housing 60, so that the angle can be adjusted conveniently according to the position where the tool T is to be used. If you want to adjust the rotation angle of the tip housing (60) by holding the handle housing (20) with one hand, holding the tip housing (60) with the other hand, turn, stop ball (65) elastically installed in the storage compartment (63) While being hardened, it is selectively coupled to the angle adjustment hole (55) configured at the distal end of the connecting pipe (53), when the tool (T) is positioned at the required angle to stop the rotation of the tip housing (60) tip housing (60) The stop ball (65) elastically installed in the storage room (63) is fitted into the angle adjusting hole (55) of the connecting pipe (53) to complete the angle adjustment.

Manual handpiece 10 to be provided in the present invention is also located in the palm of the hand holding the pressing portion 85 of the support bar 80 configured in the back of the manual handpiece 10 when the operator holds the hand for the necessary treatment, the rotating body 38 is naturally located between the thumb and index finger to be able to conveniently rotate the rotating body (38).

As well as by rotating the tool coupled to the tool holder 100 of the manual handpiece 10 can be arbitrarily adjusted when the number of procedures required to perform a stable procedure.

For example, when the flexible file is removed from the root canal treatment to remove the nerve tissue of the tooth, the tip portion of the file inserted along the nerve tissue may be bent when the flexible file is coupled to the tool holder 100 and the nerve tissue of the tooth is removed. When the file is rotated at a high speed, an accident occurs that the file is cut while the elastic recovery force is generated, but the manual handpiece 10 to be provided in the present invention adjusts the rotation speed appropriately when the file is bent. It is possible to effectively prevent the accident that the file is cut during the procedure because the nerve tissue can be removed by not being given to the excessive elastic force.

(10)-Manual Handpiece (20)-Handle Housing
(21)-Front cabinet (22)-Rear cabinet
(23)-Athletes (24)-Through holes
(30)-support (31)-horizontal shaft
(32)-Joint protrusions (33)-Vertical Shaft
(34)-Vertical Bevel Gears (35)-Coupling
(36)-Fastener (37)-Vertical Shaft
(38)-Rotator (39)-Horizontal Shaft
(40)-Horizontal Bevel Gears (41)-Rotating Body
(42)-Joining Holes (43)-Tumbler
(44)-supporter (45)-connection shaft
(46)-Solar Gears (46 ')-Sun Gears
(47)-Rotating Disc (48)-Connector
(49)-Through Hole (50)-Rotating Shaft
(53)-Connectors (54)-Ring Gears
(55)-Angle Adjuster (56)-Connection Ring
(60)-Tip Housing (61)-Soccer
(62)-Space Department (63)-Cabinet
(64)-Ball Spring (65)-Stop Ball
(66)-Angle Gear (67)-Screw Bolt
(68)-Threader (70)-Square Stopper
(71)-Internal Slope (72)-Internal Screw
(80)-support bar (81)-outer thread
(83)-stop bolt (84)-stop ring
(85)-Pressure Unit (100)-Tool Holder
(101)-Joining Holes (102)-Incision
(103)-Binding (104)-Joint
(105)-Inward Slope (106)-Axial Tube
(108)-Indentation groove (109)-Cover
(110)-Angle housing (111)-Joint protrusion
(112)-Hollow Part (115)-Angle Housing Cover
(116)-Operating Room (117)-Step
(118)-By air (120)-Pushbutton
(122)-Indentation Groove (123)-Outward Slope

Claims (3)

In the construction of the dental manual handpiece which increases the rotational force of the rotating body so that the tool coupled to the tool holder installed at 90 ° upright at the tip housing tip is rotated at a high speed, the shaft hole 23 is drilled at the tip of the handle housing 20. The front storage chamber 21 is configured, the vertical shaft hole 33 and the support shaft 30 through which the horizontal shaft hole 31 is drilled are coupled to the front storage chamber 21, and the vertical shaft rod 37 is connected to the vertical shaft hole 33. ) And the external protrusion through the shaft hole 23, and the vertical bevel gear (34) is axially coupled to the lower end of the vertical shaft (37), and the rotating body (top) of the vertical shaft (37) through the shaft hole (23) 38), the horizontal shaft hole 31 of the support 30 is inserted into the horizontal shaft bar 39, and then combined with the horizontal bevel gear 40 to the teeth of the vertical bevel gear 34, the horizontal shaft ( 39) At the distal end, the coupling hole 42 and the support hole 44 are formed to axially couple the rotating body 41, and the support hole 44 has a connecting shaft 45 fitted therein. Coupling the planetary gear 46, the ring gear 54 of the inner surface of the connector 53 coupled to the front of the handle housing 20 and the sun gear 46 'located in the center, and the sun gear 46 ') Is coupled to the rotating shaft bar 50, the tip of the rotating shaft bar 50 is coupled to the tip housing 60, the angle gear 66 is fitted to the space portion 62, the coupling portion of the tip housing 60 (69) is coupled to rotate in the connecting pipe 53, the angle gear 66 is to be coupled to the end of the rotary shaft rod 50, the tip housing (60) the front end of the coupling portion of the angle housing (110) To be coupled to the (111), the lower side of the hollow portion 112 formed on the inner side of the angle housing 110, the through hole 118 and the operating chamber 116 is formed to combine the angle housing cover 115, the operating chamber 116 ) Is coupled to the push button 120, the outwardly inclined surface 123 is formed, so that a portion protrudes to the outside through the through-hole 118 of the angle housing cover 115, the angle housing ( The hollow 112 of the 110 is coupled to the tool holder 100 is formed with a coupling hole 101, the lower end of the tool holder 100, a plurality of binding pieces (cut 102 and the engaging protrusion 104 is formed) ( 103, and the inwardly inclined surface 105 is formed at the bottom of the binding piece 103 to be in contact with the outwardly inclined surface 123 of the pushbutton 120, and then the pushbutton 120 is pressed inwardly inwardly inclined surface 105. The inner diameter of the binding piece 103 of the tool holder 100 is expanded by the reference numeral 123, and the angle driving gear 107 is coupled to the shaft tube 106 formed at the upper end of the tool holder 100 to the angle gear 66. By combining with the gear, when the tool (T) is coupled to the tool holder 100, the tool (T) is to be upright by 90 ° with respect to the tip housing (60), in the above state is coupled to the handle housing (20) When the rotating body 38 is rotated, the vertical bevel gear 34 and the horizontal bevel gear 40 rotate, and thus the rotational force increased by the ring gear 54 and the planetary gear 46. The dental manual handpiece free of angle adjustment, characterized in that to be transmitted to the tool (T) coupled to the tool holder 100 through the rotary shaft bar (50). According to claim 1, wherein a plurality of angle adjusting holes (55) is formed at the distal end of the connecting pipe (53), and the storage compartment (63) in the coupling part (69) of the tip housing (60) coupled to the connecting pipe (53). ) To make it match with the angle adjustment hole 55, and the ball chamber 64 and the ball spring 64 and the stop ball 65 is elastically installed in the cabinet chamber 63, the stop ball 65 is configured in the connecting pipe (53) Dental handpiece freely adjustable angle, characterized in that coupled to the angle adjustment hole (55). According to claim 1, When the tool (T) is coupled to the coupling hole 101 of the tool holder 100 coupled in the angle housing 110, the circular recess groove 108 formed at the bottom of the tool (T) is a tool holder (100) The dental manual handpiece free of angle adjustment, characterized in that the fitting is fixed to the engaging protrusion 104 of the binding piece 103 configured at the bottom.

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