JP3383285B2 - Dental handpiece - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental handpiece, and more particularly to a handpiece to which a cutting bar such as a micro engine or an air turbine used for dental treatment can be removably attached. The present invention relates to a dental handpiece that can be easily attached and detached.

[0002]

2. Description of the Related Art In dental treatment, as is well known, a hand piece such as a micro engine or an air turbine is used for cutting a tooth. In these hand pieces, a bar for cutting a tooth is used. The (blade) can be detachably attached to the head of the handpiece.

FIG. 2 is a sectional view showing an example of a head portion of a conventional dental handpiece to which the present invention is applied, and FIG. 2 shows an example of an air turbine handpiece, but of course,
The present invention is also applicable to micro engine handpieces. In FIG. 2, 1 is a head case, 2 is a pressing lid (upper lid), 3 and 4 are bearings, 5 is a turbine blade, 6 is a rotating cylinder, and 7 is a cutting bar.
Inside, a rotary cylinder 6 is rotatably supported by bearings 3 and 4, and is rotated together with the turbine blades 5 by compressed air blown onto the turbine blades 5. As is well known, a chuck mechanism is provided in the rotary cylinder 6, and the cutting bar 7 is detachably mounted by the chuck mechanism, and the compressed air blown to the turbine blades 5 causes high speed with the rotary cylinder 6. It is designed to be rotated.

The chuck mechanism is disclosed in, for example, Japanese Patent Laid-Open No. 9-24.
As described in detail in Japanese Patent No. 8310, one end is mounted and fixed in the rotary cylinder 6, and the fixed cylinder 8 having a slit 7a at the other end, a spring 9, and a movable member having a slit corresponding to the slit. A cylinder 10, a chuck piece 11 inserted into the slot, a chuck opening / closing member 12, and the like. When the chuck cover opening / closing member 12 is pressed by pressing the pressing lid 2 of the head case 1, the chuck opening / closing member 12 and the movable cylinder. 2 is pressed against the spring 9, a gap is created between the outer wall surface of the fixed barrel 8 and the inner wall surface of the movable barrel 10 as shown in the left half of FIG. The cutting bar 7 is opened in the fixed cylinder 8 so that the cutting bar 7 can be inserted.
Can be inserted. In this way, the cutting bar 7
When the force for pressing down the pressing lid 2 is released in the state where the fixed cylinder 8 is inserted into the fixed cylinder 8, the movable cylinder 10 and the chuck opening / closing member 12 are pushed up by the spring 9, and as shown in the right half of FIG. Grips the inserted cutting bar 7. The pressing lid 2 is normally closed by the compression spring 14 provided between the pressing lid 2 and the inner lid 13 supporting the bearing 4 as shown in the right half of FIG. It keeps in a state.

[0005]

In the dental handpiece as described above, the pressing mechanism of the head case is pushed down to open the chuck mechanism so that the cutting bar can be inserted and removed as described above. With the bar inserted,
Although the inserted cutting bar is grasped by pressing the pressing lid, the diameter D ₂ of the pressing lid 2 is smaller than the diameter D ₁ of the head case 1, and therefore the pressing lid 2 is finger (e.g., a thumb) (for a diameter D ₁ of the head case 1 is smaller than the pressing surface of the thumb) when pressed in, when the pressing surface of the thumb of the head case (illustrated example, the decorative ring 1
There was a problem that it was difficult to open and close the chuck because it hit 5).

The present invention has been made in view of the above circumstances, and in particular, the diameter D ₂ of the pressing lid 2 for opening and closing the chuck mechanism is made as close as possible to the diameter D ₁ of the head case 1 (decorative ring 15). The purpose is to prevent the pressing surface of the operator's thumb from hitting the head case 1 when the pressing lid 2 is pressed.

[0007]

According to a first aspect of the present invention, there is provided a head case, a rotary cylinder arranged in the head case, a bearing for rotatably holding the rotary cylinder, and the bearing in the head case. An inner lid for fixing, a chuck mechanism provided in the rotary cylinder, a chuck movably provided in the rotary cylinder, which moves inside the rotary cylinder to open the chuck mechanism when pressed from the outside. An operating member, a push lid that is axially movable with respect to the inner lid, and a spring that is interposed between the push lid and the inner lid and that acts in a direction that separates the push lid from the inner lid. Then, when the pressing lid is pressed against the spring, the pressing lid abuts against the chuck operating member to move the operating member to open the chuck mechanism. In the piece, the upper end of the inner lid The pressing lid has a collar portion extending in the outer peripheral direction, the pressing lid has a collar portion extending in the inner peripheral direction, and the pressing lid is pushed back in a direction away from the inner lid when not in use. It is characterized in that the collar portions are engaged with each other and the pressing lid is not separated from the inner lid.

According to a second aspect of the present invention, in the first aspect of the present invention, the inner lid is provided with a screw on an outer peripheral surface thereof, and the screw is screwed to a screw provided on an inner peripheral surface of the head case. The inner lid is fixed inside the head case.

According to a third aspect of the present invention, in the first or second aspect of the present invention, there is provided a decorative ring having an inner peripheral surface with a screw to be screwed with an outer peripheral thread of the inner lid, and the push lid includes the decorative ring. It is characterized by being movable in the axial direction inside.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of a main part of a head portion of a dental handpiece to which the present invention is applied.
The same reference numerals as those in FIG. 2 are attached to the portions having the same functions as those in the prior art shown in FIG. Thus, in the present invention, the inner peripheral surface of the lower portion of the inner lid 13 is provided with the screw 13a which is screwed into the screw provided on the inner peripheral surface of the head case 1, and the upper end portion thereof has a radial direction. A collar portion 13b extending outward is provided, and an O-ring mounting groove 13c is provided on the outer periphery of the middle portion of these. Further, a collar portion 2a extending inward in the radial direction is formed in the lower portion of the push lid 2, and the upper surface of the collar portion 2a is configured to engage with the lower surface of the collar portion 13b of the inner lid. Has been done,
As a result, even if the push lid 2 is pushed upward (away from the inner lid 13) by the spring 14, the push lid 2 does not come off from the head case. In the illustrated state, when the push lid 2 is pushed down against the spring 14, the push lid 2 pushes the chuck opening / closing member 12 to open the chuck mechanism, and the cutting bar 7 can be inserted or pulled out. In addition, the pressing lid 2 and the cosmetic ring 1
5, the combination of the inner lid 13, the collar portion 13b of the inner lid 13 and the radial notch portion provided on one of the collar portion 2a of the push lid 2 and the projection portion provided on the other side are pushed together, Next, it is rotated in the circumferential direction to the state shown in the drawing, and after that or before that, the decorative ring 15 is inserted, and then the screw portion 13a of the inner lid 13 is screwed into the head case 1.

[0011]

As described above, according to the present invention, in the dental handpiece, the diameter of the pressing lid for opening and closing the chuck mechanism provided on the upper part of the head case can be made substantially the same as the diameter of the head case. When the pressing lid is pressed with a finger, the finger portion protruding from the pressing lid does not hit the head case, and the operation when opening and closing the chuck mechanism (when inserting and removing the cutting bar) becomes very easy.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram of a head case part for explaining an embodiment of a dental handpiece according to the present invention.

FIG. 2 is a diagram for explaining a configuration example of a head portion of a conventional dental handpiece.

[Explanation of symbols]

1 ... Head case, 2 ... Push lid, 3 ... Bearing, 7 ... Cutting bar, 8 ... Rotating cylinder, 11 ... Chuck piece, 12 ... Chuck opening / closing member, 13 ... Inner lid, 14 ... Spring, 15 ... Cosmetic ring.

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61C 1/08

Claims (3)

(57) [Claims] 1. A head case, a rotary cylinder arranged in the head case, a bearing for rotatably holding the rotary cylinder,
An inner lid for fixing the bearing in the head case,
A chuck mechanism provided in the rotary cylinder, a chuck operating member movably provided in the rotary cylinder, which moves inside the rotary cylinder to open the chuck mechanism when pressed from the outside, and the inner lid. A push lid that is movable in the axial direction, and a spring that is interposed between the push lid and the inner lid and that acts in a direction that separates the push lid from the inner lid. In a dental handpiece including a head configured to move the actuating member by abutting the chuck actuating member when the pushing lid is pressed against the spring, The upper end has a collar portion extending in the outer peripheral direction, the pressing lid has a collar portion extending in the inner peripheral direction, and the pressing lid is pushed back in a direction away from the inner lid. When the color parts are Dental instruments that to the 押蓋 is characterized in that it is configured not detached from the inner lid. 2. The inner lid is provided with a screw on an outer peripheral surface thereof, and the screw is screwed with a screw provided on an inner peripheral surface of the head case to fix the inner lid in the head case. The dental instrument according to claim 1, wherein: 3. A decorative ring having a screw threaded on an outer peripheral thread of the inner lid on an inner peripheral surface thereof, and the push lid is movable in an axial direction inside the decorative ring. The dental instrument according to claim 1 or 2.