KR100905753B1 - Handpiece for dental clinic - Google Patents

Abstract

A dental handpiece is provided, which removes the bur coming-out prevention phenomenon through the bur mounting structure improvement and improves the reliability of product. A dental handpiece comprises: an impeller(1) which is installed at the housing(5) inner side in order to be rotatable; a spring cap(4) installed at the central part of the impeller; a shaft(2) which is formed in a structure that the upper part has the bigger diameter than the bottom; a bearing(6) which is installed in order to support the shaft from the upper and lower parts; a bur holder(10) installed at the spring bottom side of the inner side of the shaft; a bur pin(11) performing the wedge work about the bur(12); a stopper(13) limiting the movement of the bur holder descending in the lowering of the shaft; and an elastic member providing the ascending power.

Description

Dental handpiece with burr prevention structure {Handpiece for Dental Clinic}

The present invention relates to a dental handpiece, and more particularly, to a dental handpiece having a structure in which the burr is prevented from being pulled out even when a burr rotates at a high speed and a force opposite to the burr insertion acts on the burr.

In general, a dental handpiece is a necessity used to grind teeth in the dentist, and is used by inserting a burr into the handpiece, and there are various types of burrs installed.

The conventional structure and operation of the dental handpiece with reference to Figures 1 and 2 as follows.

1 and 2, the conventional dental handpiece (H) is installed in the center of the housing (5) so that the shaft (2) is rotatable while being supported by the bearing (6), outside the shaft (2) The impeller (1) that receives the air pressure and rotates is coupled.

At this time, the bearing (6) is respectively installed on the upper side and the lower side of the shaft (2), the outer ring of the bearing (6) O-ring that serves to hold the outer ring of the bearing and to absorb the vibration generated during rotation The damper 7 is provided.

In addition, a push button cap 8 is installed at an upper side of the housing 5, a push button 9 is installed at the push button cap 8, and a shaft 2 penetrates below the push button 9. A burr holder 10 is installed, and a buffing member 11 is installed at the lower side of the burr holder 10 so that the burr 12 can be detached from the burr holder 12 as it rises or opens as it is lifted with the burr holder.

And, the lower portion of the buffing 11 is provided with a spring (3) is compressed to allow the lowering of the buffer 10 and the buffing 11 in accordance with the push button (9), the shaft of the shaft (2) At the lower end, a spring cap 4 is screwed to prevent separation of the spring 3.

On the other hand, the inner circumferential surface of the shaft 2 has a tapered shape in which the buffing 11 is located on the basis of the state before the spring 3 is compressed, and the upper side of the buffing 11 is larger than the lower side of the buffing 11. It is formed to have a diameter.

As shown in FIG. 2, the conventional handpiece H configured as described above, when the burr 12 is required to be replaced or the burr 12 is to be removed when the burr 12 is mounted, Will behave as

First, when the push button 9 is pressed, the pressing force is transmitted to the spring 3 through the bur holder 10 and the buffing 11, and the spring 3 is compressed while the bur holder 10 and the buffing ( 11) will fall.

As the buffer 10 and the buffing 11 are lowered, the buffing 11 is no longer tapered and positioned as a wide part of the diameter inside the shaft 2. It becomes impossible to perform wedge action for (12).

At this time, when the burr 12 is pulled out, the buffer 11 is opened to the outside and the interference between the burr 12 and the buffer 11 is eliminated, and thus the burr 12 is completely removed from the handpiece.

On the other hand, when mounting the burr 12, while pressing the push button (9) as described above, insert the bur 12 as much as possible, and then remove the pressing force on the push button (9), spring ( By the restoring force of 3), the bur holder 10 and the buffing 11 are raised, and the bur 12 is bitten and fixed to the buffing.

That is, the pushing force acts on the buffing 11 located on the tapered surface of the shaft 2 by the restoring force of the spring 3, and accordingly, the buffing 11 performs a wedge action, thereby making the burr 12 work. ) Is fixed to the burr holder 10 is bitten by the buffer (11).

However, these conventional dental handpieces had the following structural problems.

The dental handpiece is a tool that cuts teeth by rotating the impeller (1) of the cartridge at a high speed up to 400,000 rpm using air, and receives a force in the direction opposite to the bur insertion due to burr and buff wear caused by continuous use. There was a problem that often occurs deviation.

In addition, as described above, when the phenomenon of burr detachment occurs during treatment, there is a problem in that a dangerous situation may be caused by the burr falling into the patient's mouth and entering the airway.

The present invention is to solve the above-mentioned problems, and to provide a dental handpiece with improved product reliability by being able to completely eliminate the burr phenomenon by improving the bur mounting structure of the dental handpiece. have.

In order to achieve the above object, the present invention, a shaft that rotates together with the rotation of the impeller installed inside the housing, a burr holder is installed to be movable along the axial direction inside the shaft, coupled to the bur holder and the shaft and In the dental handpiece having a buffing to perform the wedge action on the burr according to the relative position of; The burr holder and the buffing pin, the burr is prevented from falling out of the dental handpiece, characterized in that when the burr is rotated at a high speed to act on the opposite direction of the burr inserted into the burr, the buffing to apply a wedge action to the burr Is provided.

In the above configuration, the buffing upper side is characterized in that the spring is always provided to press the buffing in the wedge force action direction.

On the other hand, according to another aspect of the present invention for achieving the above object, an impeller installed rotatably inside the housing; The shaft is installed in the center of the impeller to rotate together when the impeller is rotated, the spring cap is installed on the upper end, the portion where the buffin is tapered so that the upper side has a larger diameter than the lower side to form a structure of the upper and lower Wow; A spring installed inside the shaft and installed at a lower side of the spring cap to always press the buffing in a wedge force action direction; A bearing installed to support the shaft in upper and lower parts of the shaft; A burr holder installed at a lower side of a spring inside the shaft; A buffing coupled to an upper end of the bur holder and positioned on a tapered surface of the shaft and performing a wedge action on the burr; A stopper provided to limit movement of the bur holder descending together when the shaft is lowered; There is provided a burr prevention structure of the dental handpiece, characterized in that it comprises an elastic member for providing a lift force to the shaft and the lowering element associated with it.

In the above-described configuration, the elastic member is characterized in that it is installed under the bearing installed on the lower side of the shaft.

In the above configuration, the elastic member is characterized in that the wave washer.

The effects of the present invention configured as described above are as follows.

The burr prevention structure of the present invention effectively solves the burr problem that occurs when the burr rotates at a high speed in a direction opposite to the burr insertion direction or when the burr is worn.

That is, the present invention provides an effect of increasing the product reliability of the handpiece by preventing a serious problem that may cause a dangerous situation by the burr is dropped into the patient's mouth or enter the airway during medical treatment.

Hereinafter, with reference to Figure 3 will be described in detail for the practice of the present invention.

Figure 3 is a cross-sectional view of the main portion of the dental handpiece according to the present invention, the dental handpiece according to the present embodiment, the housing 5, the impeller 1 is installed to be rotatable inside, and the impeller 1 A shaft (2) installed to rotate together with the rotation of the spring, a spring (3) installed inside the shaft (2), a spring cap (4) installed to prevent shaft departure of the spring (3), and A bearing 6 installed to support the shaft 2 on the upper and lower parts of the shaft 2, a bur holder 10 installed to hold the burr 12 inside the shaft 2, and the burr holder ( 10 is a dental clinic including a buffing 11 which is installed on the bur 12 to the wedge 12, and a push button 9 is installed to apply a pressing force for the attachment and detachment of the bur 12 (12). A handpiece for; The shaft 2 is installed to be lowered together by pressing the push button 9, the upper end of the shaft 2 is provided with a spring cap (4), the lower side of the spring cap (4) the buffing ( 11) is always provided with a spring (3) is always pressurized in the wedge force action direction, the lower side of the spring (3) is provided with a burr holder 10, the upper end of the bur holder 10, the lower side The buffing 11 is installed to have a larger diameter than the side, and the surface corresponding to the buffing 11 of the inner circumferential surface of the shaft 2 has a larger upper side than the lower side in accordance with the shape of the buffing 11. The tapered surface is formed to have an upper and lower narrow structure as a tapered surface, and the diameter of the upper portion of the upper end of the buffine of the shaft 2 is formed to be equal to or larger than the diameter of the upper end of the buffing 11, and the shaft 2 Diameter of the lower portion of the lower portion of the Is formed below, the stopper 13 for restricting the movement of the holder member 10, which descends with the time of the fall of the lower side shaft (2) of the holder member 10 is provided.

In addition, the impeller 1 and the bearing 6 coupled to the outside of the shaft 2 are fixedly installed on the shaft 2 to move together when the shaft is elevated.

In addition, the lower side of the bearing (6), when the pressing force is removed through the push button, the impeller (1), the descending element and the wave washer (14), which is an elastic member that serves to raise the bearing 6 and the shaft again is installed. do.

The impeller (1) outside the shaft (2) is rotated by receiving the pneumatic pressure, the outer ring (6) O-ring damper that serves to support the outer ring of the bearing and to absorb the vibration generated during the rotation ( 7) is installed.

The o-ring damper 7 contacts the outer ring of the bearing 6 when the lowering elements such as the shaft 2, the impeller 1, and the bearing 6 descend as the push button 9 is pressed. It allows sliding and is inserted into the bearing plate 15.

In addition, the push button 9 which is installed to move up and down is capable of lifting up and down so as not to leave the push button cap 8, and the buffing 11 installed above the bur holder 10 is the bur holder 10. The wedge action on the burr 12 is performed by retracting or opening according to the change in relative position between the shaft and the shaft 2).

That is, the inner circumferential surface of the shaft 2 has a tapered shape in which the buffing 11 is located on the basis of the state before the spring 3 is compressed, and the diameter of the upper side of the tapered surface is more than that of the lower side of the tapered surface. It is formed to have a large diameter.

In addition, an outer case 16 is installed outside the housing 5, and a push button cap 8 for installing the push button 9 is installed above the outer cover.

The operation of the present invention configured as described above is as follows.

Unlike the existing handpiece, the dental handpiece of the present invention has a tapered inner circumferential surface of the portion where the buffine 11 is located, and is tapered in a wider shape than the lower portion thereof, and the buffing Since the spring 3 is applied to the upper side of the bur holder 10 to which the 11 is coupled, the wedge force of the buff pin 11 always acts on the bur 12.

In particular, the dental handpiece of the present invention is installed in the opposite direction to the position of the tapered surface and the position of the buffing 11 of the inner peripheral surface of the shaft (2), thereby intentionally pressing the pushbutton for detachment of the burr Unless there is a state, when the force acts in the opposite direction to the burr insertion direction against the burr, the wedge action of the buffing force is applied with greater force.

That is, according to the present invention, because the wedge force of the buffing is maintained even when the force in the opposite direction of the burr insertion is transmitted when the burr rotates at a high speed or when the force is transmitted in the opposite direction of the burr insertion by buffing wear, Burr missing phenomenon caused by the decrease in the wedge force of the buffing is eliminated.

In addition, as the present invention prevents the burr phenomenon as described above, it is possible to improve the safety of the patient by removing the risk factors that may be caused by the departure of the burr during the treatment, and further improve the product reliability.

Hereinafter, with reference to Figure 3 will be described the exchange process of the bur in the dental handpiece of the present invention.

First, as shown in FIG. 3, when the burr 12 is mounted, the burr needs to be replaced or the burr is to be removed.

When the user presses the pushbutton (9), the pressing force is transmitted to the spring cap (4) in contact with it, the pressing force is also transmitted to the shaft (2) to which the spring cap (4) is coupled to the spring cap (4) and the shaft Is lowered and the bur holder 10 and the burr 12 installed inside the shaft 2 are also lowered together with the shaft.

At this time, the descending bur holder 10 is a structure that allows the lowering only as much as the distance (L1) to the stopper 13 positioned below it, and immediately touches the stopper 13 installed on the lower side of the housing (5) It stops and can no longer descend, and instead, the descending element such as the shaft 2 continues to descend while compressing the spring 3.

If the shaft 2 continues to descend even when the bur holder 10 is stopped as described above, a change occurs in the relative position between the bur holder 10 and the shaft 2, and the buffing 11 inside the shaft. This causes the diameter of the taper to move toward the wider diameter of the upper buffet position.

That is, as the shaft 2 continues to descend while the bur holder 10 is stopped, the same result as that of the bur holder 10 is raised relative to the shaft, so that the buffing 11 moves out of the tapered surface and the shaft ( 2) As the inner diameter is located in a wide part, the buffing 11 can no longer perform a wedge action on the burr 12.

Accordingly, when the burr 12 is grabbed and pulled out, the burr is easily pulled out of the handpiece.

When the push button (9) is pushed down on the elements that are lowered, the spring cap (4), the shaft (2), the impeller (1) and the bearing (6) coupled to the shaft (2) are lowered together The burr holder 10 and the buffer 11 and the burr 12 are lowered until they come in contact with the stopper 13, and the spring 3 is lowered together when the shaft 2 is lowered, and the burr holder 10 is lowered. Is compressed after the contact with the stopper 13 stops, and the wave washer 14 provided below the bearing 6 is also compressed by the lowering of the shaft 2 and the bearing 6.

On the other hand, the following describes the mounting process of the bur in accordance with the replacement of a new bur in the dental handpiece of the present invention.

While pushing the pushbutton 9 as far as possible, push the burr into the burrholder 10 as much as possible, and then remove the pressing force on the pushbutton 9.

When the pressing force on the pushbutton 9 is removed, the shaft 2 and the bearing 6 and the impeller 1 are lowered by the elastic restoring force of the wave washer 14 installed below the lower bearing 6. The elements are raised again, which means that the bur holder 10 is lowered relative to the shaft 2 so that the buffine 11 is located on the tapered surface again under the pushing force of the spring 3. The burr 12 inserted into the bur holder 10 is fixed to the buffing pin 11.

That is, the pushing force acts on the buffing 11 so as to be located on the tapered surface of the shaft 2 by the restoring force of the spring 3, and thus the buffing 11 performs a wedge action, thereby making the burr 12 work. ) Is fixed to the burr holder 10 is bitten by the buffer (11).

As described above, the dental handpiece of the present invention is a very useful invention which improves the product reliability of the dental handpiece by allowing the burr phenomenon to be completely eliminated by improving the structure of the burr fixing device.

On the other hand, the rights of the present invention is not limited to the embodiments described above, but is defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self evident.

For example, in the above, the wave washer 14 may not necessarily be installed under the lower bearing, and the elastic member for raising the descending elements is not necessarily limited to the wave washer. In other words, any elastic member can be installed if the descending elements can be raised and repositioned while the pressing force is removed, and the installation position can be changed according to the type of elastic member.

1 illustrates the appearance of a dental handpiece

Figure 2 shows the main portion of Figure 1, a sectional view of the main portion of the dental handpiece according to the conventional structure

Figure 3 is a cross-sectional view of the main portion of the dental handpiece according to the present invention

* Description of the symbols for the main parts of the drawings *

1: impeller 2: shaft

3: spring 4: spring cap

5: housing 6: bearing

7: O-Ring Damper 8: Pushbutton Cap

9: pushbuttons 10: burr holder

11: Buffin 12: Bur

13: Stopper 14: wave washer

Claims (5)

An impeller rotatably installed inside the housing; The shaft is installed in the center of the impeller to rotate together when the impeller is rotated, the spring cap is installed on the upper end, the portion where the buffin is tapered so that the upper side has a larger diameter than the lower side to form a structure of the upper and lower Wow; Bearings installed to support the shaft above and below the shaft; A burr holder installed at a lower side of a spring inside the shaft; A buffing coupled to an upper end of the bur holder and positioned on a tapered surface of the shaft and performing a wedge action on the burr; A stopper provided to limit movement of the bur holder descending together when the shaft is lowered; And a resilient member providing a lift force to the shaft and the descending element associated with the shaft. The method of claim 1, The buffing upper side is a dental handpiece, characterized in that the buffing is further provided with a spring to always press in the direction of the wedge force acting on the burr. delete The method of claim 1, The elastic member is a dental handpiece, characterized in that installed under the bearing is installed on the lower side of the shaft. The method according to claim 1 or 4, The elastic member is a dental handpiece, characterized in that the wave washer.

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