JPS61284242A - Dental handpiece - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present application relates to an angle-type dental knife which has eight rotary drive parts in a shaft cylinder whose front part is bent, thereby reciprocating a cutting tool.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, a rotary drive unit such as an air motor and a repetitive motion mechanism operated by the rotary driving shaft are disposed in a long shaft cylinder with a bent front part, and the bent part At this position, a gear transmission mechanism consisting of a crown gear or a gold tooth gear is installed, and this gear transmission mechanism.

A driven shaft disposed in the front shaft cylinder is connected to the operating part t-1 provided at the head end of the driven shaft.The driven shaft is operated by the driven shaft to reciprocate the cutting tool.For example, a dental device used for root canal treatment. The handpiece for this purpose is known, for example, from Japanese Unexamined Patent Publication No. 183845/1983.

However, in the conventionally known dental handpiece described above, the driven shaft and the main driving shaft, which have different axial directions, are connected via a gear interlocking mechanism.

During operation, a meshing sound is generated, which causes discomfort to the patient, and vibrations are also generated, which impairs the smoothness of rotation transmission.Moreover, the gear transmission mechanism has a repetitive motion mechanism at the position where the force is released. Therefore, the present application omit the gear transmission mechanism and provide a structure in which the tip of the main drive shaft is rotated by a one-rotation moving part. A main rotary plate provided with an eccentric shaft pin and a slave rotary plate are respectively pivotally attached to the rear end of a driven shaft interlocking with the main rotary plate.

A rotating piece in which a rotating shaft passes through the intersection of the respective axes of the main drive shaft and the driven shaft between these rotating plates, extends in a direction perpendicular to the main drive shaft and the driven wheel, and is rotatably supported at both ends. The above-mentioned disadvantages of the conventional ones are solved by providing a rotating piece with a guide groove that engages each of the eccentric shaft pins and extends in a direction parallel to the rotating shaft. Embodiments of the present application will be described in detail with reference to the drawings.

The handpiece body A has a tip K11 connected to the front part of a long shaft cylinder (1) via a bending connection part (2) and a nut member (3).
It is constructed by connecting a front shaft cylinder (4) equipped with a cylindrical stator (4) in an angular shape. The end member (7) consists of a rotor (6) with radially arranged wings and a rotor (7) on both end faces.

(7) A closed rotary drive body (8) consisting of an air motor, for example, is provided, and this rotary drive body (8)
The output shaft (9) is connected to the shaft cylinder (1) via the reduction mechanism Ql.
0 connected to the driving shaft I extending in one direction along the axis of
Further, inside the front shaft cylinder (4), there is a driven shaft α9 which extends along its axis and whose tip is connected to the rotational operating part I of the cutting bar (13) and rotates it. At the tip of the main drive shaft aυ, there is a main rotary plate (18) having an eccentric shaft pin αη protruding from the front surface, and at the rear end of the driven shaft Q4, an eccentric shaft pin αη is provided on the rear surface. Sub-rotary plate wings each having a number 9 protruding from the pin are attached, and between these main rotary plates (181) and the sub-rotary plate (1), the rotation axes are connected to the main drive shaft (1N) and the driven shaft a9. It passes through the intersection αe of both rotational axes of , is slidably engaged with the outer circumferential surface of this rotary piece (211) with the eccentric shaft pin αη of the main rotary plate side and the eccentric shaft pin a9 of the slave rotary plate, and the rotation of the rotary piece 12]1. 9 of a pair of guide grooves that extend in the direction Kwf parallel to the axis and are recessed along the direction of the axis of one rotation.
g3 is arranged. Inside the handpiece main body A, there is an air supply hole that supplies pressurized air to the rotary drive body (8), and an air supply hole that leads to a mist spout provided at the head α2 position. A joint member B is provided at the rear end for supplying water and pressurized air from a water source and a pressurized air source into the handpiece body A through a flexible hose G. Connected detachably.

When the rotary drive body is driven by the pressurized air supplied from the joint member B, the main rotary plate 0 is integrally connected to the manual shaft αυ.
I19 rotates, and due to this rotation, the eccentric shaft bis αη is held in one guide groove ■ of the one-rotation piece c24, and reciprocates along the guide groove ■ while the main drive shaft I rotates υt. As a result, the rotating piece C4 repeats one reciprocating motion around the rotational axis every rotation of the raw rotating plate α seconds. guide groove (2
The other eccentric shaft pin (2) is movably engaged with 31.
As a result, the slave rotary plate repeatedly rotates back and forth.

As a result, the driven shaft a9 and the actuating portion (14) also reciprocate.

The cutting bar a3 moves repeatedly.

In the above, the main drive shaft is The rotation ratio between the shaft and the driven shaft can be varied.

Furthermore, in the above embodiment, the one-turn piece c! Although the case of a columnar body is illustrated as No. 4, it goes without saying that this may also be composed of a sphere or the like.

Effects of the Invention As described above, according to the present application, the main body, each having an eccentric shaft pin,
A repeating motion mechanism consisting of a pair of secondary rotating plates and a rotating piece having a pair of guide grooves parallel to the rotating axis that engages with each of the eccentric shaft pins, respectively, is arranged at the intersection of the driving shaft and the driven shaft. Since the gear transmission mechanism can be omitted, the meshing sound and vibration caused by meshing of the gears can be eliminated as in the conventional method, and the structure can be simplified and obtained at low cost. It also has the advantage of smooth rotational transmission.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and Figure 1 is an overall side view.
The figure is an enlarged sectional view of the gripping part, and the fang 3 is a plan view of the rotating piece. In the figure, (1) is the shaft cylinder, (8) is the rotary drive body, and αυ is the main drive shaft. (151 is the driven shaft, aQ is the intersection, αη, (19 is the eccentric shaft pin or main rotary plate, (21 is the slave rotary plate, (21 is the rotary piece, (2), (231 is the guide groove).

Claims (3)

[Claims] (1) A rotary drive unit and a main drive shaft are arranged in a shaft cylinder whose front part is bent and a driven shaft is provided inside, and the rotation of the main drive shaft is transmitted to the driven shaft. In a dental handpiece comprising an angled handpiece body for actuating an actuating part, an eccentric shaft pin is provided at the tip of the main drive shaft rotated by the rotary drive part and at the rear end of the driven shaft connected to the actuating part. The main rotary plate and the slave rotary plate are each pivoted, and between these rotary plates, the axis of rotation passes through the intersection of the axes of the main drive shaft and the driven shaft, and A rotary piece extending in orthogonal directions and rotatably supported at both ends is disposed, and the rotary piece is provided with a guide groove that engages with each of the eccentric shaft pins and extends in a direction parallel to the rotation axis. A dental handpiece characterized in that the handpiece is formed. (2) The dental handpiece according to claim 1, wherein the rotating piece is a columnar body and has rotating shafts on both end faces thereof. (3) The dental handpiece according to claim 1, wherein the rotating piece is spherical and has rotating shafts at both ends in the diametrical direction.