JPS6125772Y2 - - Google Patents

Description

[Detailed description of the invention] The present application relates to an attachment/detachment mechanism for a dental handpiece, and in particular, a device configured such that a cutting bar driven by an air motor or a micromotor can be attached and detached extremely easily by external operation. It is.

Conventionally, there have been methods for attaching and detaching the cutting bur in dental handpieces, such as by rotating a ring or tilting a lever. Because the handpiece is weak, it tends to rattle, and with lever-type handpieces, the lever always protrudes from the outer periphery of the handpiece body, so the lever gets in the way during use.
The problem was that it was difficult to operate. Therefore, the present application solves such drawbacks, and its embodiment will be described in detail below with reference to the drawings. 1 is a cylindrical gripping part consisting of a front part 1a, an intermediate part 1b, and a rear part 1c; The intermediate portion 1b and the rear portion 1c are screwed together in a separable manner, and a rear member 4 having a pressurized air passage 2 and a pressurized water passage 3 therein is fitted and attached to the rear portion 1c of the grip portion 1. ing. Reference numeral 5 denotes a drive source consisting of an air turbine installed in the intermediate portion 1b of the gripping portion 1, which is rotated by pressurized air supplied through the pressurized air passage 2, and this rotation extends in the axial direction. Output is performed by the output shaft 6. Reference numeral 7 denotes an operating shaft that is rotatably supported by the shaft 1a, and this rear projection 8 and the output shaft 6 are connected by a rotating shaft cylinder 9. The actuating shaft 7 has a hollow part 10 therein which is open at the tip and extends in the axial direction, and the tip opening 11 is inclined in a conical shape and diametrically opposed to the rear position of the hollow part 10 and extends in the axial direction. A long slot 12 is provided. 13 is the operating shaft 7
The chuck sleeve 13 is a cylindrical chuck sleeve that is tightly fitted into the hollow portion 10. The chuck sleeve 13 has a plurality of slits 14 extending in the axial direction in the front half, and the outer periphery of the front end is located at the tip of the operating shaft 7. It is formed into a tapered shape so as to match the slope of the opening 11. Reference numeral 15 denotes a sliding ring fitted to the outer periphery of the intermediate portion of the operating shaft 7, which is fixed to the rear end of the hand piece 13 and extends in the diametrical direction.
A connecting pin 16 protrudes to the outer periphery of the operating shaft 7 through the
is fixed to. 17 is a coil spring interposed between the sliding ring 15 and a bearing 18 that supports the tip of the operating shaft 7, and constantly presses the chuck sleeve 13 backward through the sliding ring 15; An operating hole is opened in the radial direction of the gripping portion 1 and is used to detachably and rotatably insert an operating shaft 24 of an operating tool B to be described later. The chuck sleeve 13 is provided at a position where the rear part of the sliding ring 15 faces when it is sufficiently pressed rearward. A cover ring 20 closes the operation hole 19 and is slidably fitted around the outer periphery of the grip portion 1. Reference numeral 21 denotes a water nozzle attached to the outer periphery of the tip of the gripping part 1, which is connected to the pressurized water passage 3 of the rear member 4 via the water pipe 22.
is configured. Reference numeral B designates an operating tool in which a handle 23 and an operating shaft 24 are formed into a T-shape. A semicircular cam portion 2 that presses forward against the coil spring 17
It is formed from 6. Note that 27 is a bearing.

Therefore, when attaching the cutting bar C to the dental handpiece A, first move the cover ring 20 backward to expose the operation hole 19.
At 9, as shown in FIG. 3, the operating shaft 24 of the operating tool B is inserted so that the cam portion 26 comes into contact with the rear end surface of the sliding ring 15, and in this state, the operating tool B is rotated 180 degrees. Then, as shown in FIG. 4, the sliding ring 15 is moved forward by the cam portion 26 against the elasticity of the coil spring 17, and at the same time, the chuck sleeve 13 is also slid forward, and the outer periphery of its tip is activated. It protrudes away from the tip opening 11 of the shaft 7. Therefore, in this state, attach the cutting bar C to the chuck sleeve 13.
fully insert the operating tool B into the operating hole 19.
When pulled out, the sliding ring 15 and chuck sleeve 13 are pressed backward together by the coil spring 17, and as a result, the tip of the chuck sleeve 13 is wedged into the tip opening 11 of the actuating shaft 7. The cutting bar C is held under pressure by the chuck sleeve 13 due to the intervention of these inclined surfaces.

As described above, according to the present application, it is possible to easily obtain a large clamping force for the cutting bar by selecting a coil spring, and the operating tool is used only when the cutting bar is detached and is removed during cutting treatment, so it is easy to use for treatment operations. Without getting in the way, especially according to the present application,
The operating shaft is located in the center of the horizontally long handle, so even if a strong spring is used to increase the chuck force, the handle can be operated easily and easily, making it convenient to handle. It has certain advantages.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view of the dental handpiece with the operating tool separated, FIG. 2 is an overall side view of the dental handpiece with a cutting bar attached, and FIG. 3 and 4 are partially cutaway top views of the main parts showing the state of use. In the figure, 1 is a grip part, 5 is a drive source, 7 is an operating shaft, 1
0 is a hollow part, 11 is a tip opening, 12 is a long hole, 1
3 is a chuck sleeve, 14 is a slit, 15 is a sliding ring, 16 is a connecting pin, 17 is a coil spring, 19 is an operating hole, 23 is a handle, 25 is a shaft portion, 26 is a cam portion, A is a dental hand piece,
B is an operating tool, and C is a cutting bar.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical grip part containing a driving source has a hollow part connected to the driving source and having a conical opening in the axial direction in the front part thereof; An operating shaft having an axially elongated hole on its outer periphery is rotatably supported, and within the hollow portion of the operating shaft,
A chuck sleeve having a slit in the axial direction and a tapered outer periphery that matches the opening at the tip of the actuating shaft is fitted, and a chuck sleeve is fitted on the outer periphery of the actuating shaft within the elongated hole. A sliding ring fixed to the chuck sleeve via a moving connecting pin and a coil spring that always presses the sliding ring backward are arranged, and the rear part of the sliding ring is normally attached to the gripping portion. A dental handpiece comprising: an operating hole opened in the radial direction so that a portion of the dental handpiece faces; a shaft portion rotatably and removably fitted into the operating hole; An attachment/detachment device for a cutting bar in a dental handpiece, comprising an operating tool having an operating shaft provided at the center of a horizontally long handle and having a cam portion that presses forward against a coil spring. . (2) A device for attaching and detaching a cutting bar in a dental handpiece according to claim 1, wherein the driving source is an air motor. (3) Utility model registration claim 1 or 2, in which elongated holes are provided opposite to each other in the diametrical direction of the operating shaft, and connecting pins protrude from each of the elongated holes and a sliding ring is fixed to the connecting pins. A mechanism for attaching and detaching a cutting bur in the dental handpiece described in 2.