JP2951935B1 - Dental handpiece chuck mechanism - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To secure safety by stopping rotation when a cutting bar comes out of a handpiece during dental treatment. A rotary cylinder is provided in a head case, and a chuck cylinder is fixed to an inner wall of the rotary shaft. A first spring 41, a chuck opening / closing sleeve 42, a push stopper 43, and a first stopper 41 are provided between the chuck cylinder 30 and the rotary cylinder 20, and one end of the push stopper 43 and an end of the rotary cylinder. The second spring 44 is provided. The push stopper 43 is pressed down via the lid member 13 to release the chuck function, and the cutting bar is engaged with the chuck cylinder 30. When the cutting bar comes off from the chuck cylinder 30 during use, the push stopper 43 is pushed back by the first spring 41 and the push stopper 43 hits the lid member 13 to stop the rotation of the rotary cylinder 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental chuck mechanism, and more particularly, to a handpiece such as a micro engine and an air turbine used for dental treatment, wherein a cutting bar comes out of the handpiece during dental treatment. And a chuck mechanism for a dental handpiece that stops rotating.

[0002]

2. Description of the Related Art In dental treatment, as is well known, handpieces such as a micro engine and an air turbine are used to cut teeth. In these handpieces, a bar (not shown) for cutting teeth is used. The blade can be detachably attached to the head of the handpiece.

[0003]

As is well known, a chuck mechanism is used to mount the cutting bar. However, in dental treatment, the cutting bar is rotated at a high speed in the oral cavity of a patient, so that the dental bar is used. It is very dangerous if the cutting bar comes off the chuck mechanism during treatment.

[0004] The present invention has been made in view of the above situation, and particularly, in a dental treatment handpiece,
When the cutting bar comes out of the handpiece during dental treatment, the rotation of the micro engine or the air turbine is stopped to ensure safety.

[0005]

SUMMARY OF THE INVENTION The present invention provides a rotating cylinder rotatably disposed in a head case, a bearing for rotatably holding the rotating cylinder , and an outer diameter smaller than the inner diameter of the rotating cylinder. A plurality of arc-shaped strips which are divided by several slits extending from one end and formed so that the outer diameter gradually increases on the end side, and the other end Part, a chuck cylinder fixed to the inner wall of the rotating cylinder, a first spring inserted into a gap between the chuck cylinder and the rotating cylinder, and inserted into the gap,
A chuck opening / closing sleeve having one end in contact with the first spring and an inner diameter gradually increasing toward the other end, and one end engaged with the other end of the cylindrical body, and the other end exceeding the rotary cylinder. A push stopper extending and having an end extending to the lid member of the head case, and a second spring disposed between the one end of the push stopper and the end of the rotary cylinder; The push stopper is depressed through the lid member to release the engagement between the chuck cylinder and the chuck opening / closing sleeve, and the cutting bar is caught by the chuck cylinder, and the cutting bar is released from the chuck cylinder. At the time, the push stopper is pushed back by the first spring, and the push stopper hits the lid member to stop the rotation of the rotary cylinder.

[0006]

FIG. 1 is a sectional view of a main part (head part) of a dental handpiece to which the present invention is applied.
The case of an air turbine handpiece is shown as an example, but the difference is whether the rotating cylinder is rotated by blowing air to the turbine blade or by a bevel gear provided on the rotating cylinder. It can be easily understood that the present invention is applicable to an engine handpiece.

In FIG. 1, reference numeral 10 denotes a head case,
Is a rotating cylinder, and the rotating cylinder 20 has bearings 21 and
2, an outer race of the bearings 21 and 22 is fixed to the head case 10 by O-rings 11 and 12, respectively, whereby the rotating cylinder 20 and the turbine integrated with the inner race are formed. The blades 23 are rotatably supported in the head case 10.

In the rotary cylinder 20, a chuck mechanism is provided for detachably attaching a cutting bar to the rotary cylinder 20. The chuck mechanism holds the cutting bar, and rotates the cutting bar together with the rotary cylinder 20. To cut teeth.

FIG. 2 is a view for explaining an example of the chuck cylinder 30 mounted in the rotary cylinder 20, and FIG.
FIG. 2 is a sectional view showing a part of the chuck cylinder 30 in a sectional view.
FIG. 2B is a view of FIG. 2A as viewed from the direction of the line BB, wherein the chuck cylinder 30 has one end 31 fixed to the rotary cylinder 20;
It has a cylindrical portion 32 extending from the one end 31 and having a smaller diameter than the rotary cylinder 20. The small-diameter cylindrical portion 32 has several slits 33 extending in the axial direction. Numeral 32 denotes several lines extending in the axial direction (in the example shown, 4
) Are divided into strips 32 (32a, 32b, 32c, 32d).

Each of the strips 32a to 32d has its tip end notched in the axial direction and has a strip 32 '(32a', 32b ',
32c ', 32d') and each strip 3
2 '(32a' to 32d ') is inclined so that its outer diameter gradually increases.

The small diameter portion 32 of the rotary cylinder 20 and the chuck cylinder 30
And a first opening / closing sleeve 42 having an inclined surface N which engages with the inclined surface M of the tip end portion of the chuck cylinder. A push stopper 43 is sequentially provided on 42. This push stopper 43
A second spring 44 is provided between the lower end of the rotary cylinder 20 and the upper end of the rotary cylinder 20.
The second spring 44 applies a force to push the chuck opening / closing sleeve 42 back to the first spring 41.

In the handpiece as described above, in order to attach a cutting tool to the chuck mechanism, first, the upper lid 13 as a lid member of the head case 10 is attached to a spring 14.
When the push-down stopper 43 is pushed down, the push stopper 43 is pushed down by the upper lid 13, so that the chuck opening / closing sleeve 42 is pushed down. ~
32d '), the outer peripheral inclined surfaces are separated, and a gap is formed between these inclined surfaces, so that a cutting tool can be inserted into the chuck cylinder 30.

After the cutting bar is inserted into the chuck cylinder 30 as described above, when the pressing applied to the upper lid 13 is released, the chuck opening / closing sleeve 42 is pushed back by the first spring 41, and the chuck opening / closing sleeve 42 is again pressed. The inclined surface M of the cylinder 30 engages with the inclined surface N of the chuck opening / closing sleeve 42 to bite the cutting bar with the strip 32 ′ of the chuck cylinder 30. ′ Opened by insertion of cutting bar (increased diameter)
In this state, the chuck opening / closing sleeve 42 is in a state of being lowered as shown in the figure. In this state, the tip of the push stopper 43 does not hit the inner surface of the upper lid 13 and the rotating cylinder 20 Can rotate without any hindrance, and can perform normal tooth cutting work.

Here, when the chuck is loosened and the cutting bar begins to come off, the chuck opening / closing sleeve 42 is pushed upward by the first spring 41, and the push stopper 43 also moves upward against the second spring 42. Finally, the tip 43a of the push stopper 43 hits the upper lid 13 and the rotation stops.

[0015]

As described above, according to the present invention, in a handpiece such as an air turbine or a micro engine used for dental treatment, when the cutting bar inserted into the head portion comes off, the push stopper 43 is closed. Since the rotation is stopped by contacting the inner wall of the thirteen, it is possible to concentrate on the treatment without worrying that the cutting bar may fall off during the treatment.

[Brief description of the drawings]

FIG. 1 is a view for explaining a configuration of a main part (head part) for explaining an example of a dental handpiece according to the present invention.

FIG. 2 is a view for explaining an example of a chuck cylinder used in the chuck mechanism shown in FIG.

[Explanation of symbols]

10: head case, 11, 12: O-ring, 13: lid
Member (top cover) , 14 ... spring, 20 ... rotary cylinder, 2
1, 22 ... bearing, 23 ... turbine blade, 30 ... chuck cylinder, 31 ... end part fitted to the rotary cylinder of the chuck cylinder, 32 ... small diameter part of the chuck cylinder, 32a to 32d ... strip, 32a 'to 32d '... strip, 33 ... slit, 4
1: first spring, 42: chuck opening / closing sleeve,
43 ... push stopper, 44 ... second spring.

Claims (1)

(57) [Claims] 1. A rotating cylinder rotatably disposed in a head case, a bearing rotatably holding the rotating cylinder , and an outer diameter smaller than an inner diameter of the rotating cylinder , and one end of the rotating cylinder. A plurality of arc-shaped strips that are divided by several slits extending from and that are formed so that the outer diameter gradually increases on the end side, and at the other end, the inner wall of the rotary cylinder A first spring inserted into a gap between the chuck cylinder and the rotary cylinder; a first spring inserted into the gap, one end of which contacts the first spring; A chuck opening / closing sleeve having an inner diameter gradually increasing toward one end, one end of which engages with the other end of the cylindrical body, the other end of which extends beyond the rotary cylinder, and the end of which is a cover member of the head case. And a push stopper extending in front of the push stopper And a second spring disposed between one end side and the end portion of the rotary cylinder, engagement between the chuck cylinder and the chuck opening and closing the sleeve by pressing the push stopper through said lid member When the cutting bar is released from the chuck cylinder by releasing the engagement and the cutting bar comes off from the chuck cylinder, the pushing stopper is pushed back by the first spring, and the pushing stopper is attached to the lid member. A chuck mechanism for a dental handpiece, wherein the rotation of the rotary cylinder is stopped.