JPH0340260Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present application relates to a dental cutting tool that rotates a cutting bar by a driving source.

BACKGROUND TECHNOLOGY AND PROBLEMS Conventionally, as shown in FIGS. 2 and 3, a cylindrical grip part 2 has a front part 1 tapered and a drive part P connected to a rear end thereof. A shaft cylinder 5 having a small-diameter clamping part 3 at the front end and a small-diameter stepped part 4 at the rear end and mounted so as to be slidable in the longitudinal direction, and a gripping part 2 located inside the shaft cylinder 5. a rotary shaft 9 which is rotatably attached to the drive section, has a chuck 7 at its front end for clamping the cutting bar 6, and has a driven shaft 8 extending from its rear end, which is connected to the output shaft of the drive section; It is interposed between the shaft cylinder 5 and the rotating shaft 9, and the front end is the shaft rod 1.
0, the rear end of which abuts against the small-diameter stepped portion 4 of the shaft cylinder 5 to constantly pressurize the shaft cylinder 5 rearward, and further includes a spring 11 that is fixed at two positions in the diametrical direction of the grip portion 2 and has a dogleg shape. One of the working pieces 12 is bent to the grip part 2.
facing inward, the tip abuts the rear end surface of the shaft cylinder 5,
The other acupressure piece 13 projects outward from the grip part 2 and extends obliquely backward.
When the cutting bar 6 is clamped, the small diameter clamping part 3 of the shaft cylinder 5 is pressed against the head of the chuck 7 by the spring 11, as shown in FIG. When removing the cutting bar 6 by pinching the part, as shown in FIG. , the small diameter clamping part 3 is removed from the head of the chuck 7.
Dental cutting tools configured to remove the dental material are known.

However, with this configuration, if the finger pressure piece of the attachment/detachment lever that protrudes from the outer periphery of the grip part is accidentally pressed while the cutting bar is being rotated, there is a risk that the cutting bar will become unclamped and the cutting bar will fly out. There is.

Purpose, Structure, and Function of the Invention The present invention is an attempt to improve such defects, and its feature is that the cutting bar is attached and detached by pressing the finger pressure piece of the attachment/detachment lever protruding from the outer periphery of the grip. In the dental cutting tool configured as above, a protection ring is slidably fitted on the rear outer periphery of the grip portion so as to be movable to a position facing the lower surface of the acupressure piece of the detachable lever, and a protection ring is slidably fitted on the outer periphery of the acupressure piece. It is provided with an engagement groove that engages a protrusion provided on the inner surface of the piece.

That is, in the figure, reference numeral 16 denotes a protective ring fitted to the rear outer periphery of the grip part 2 so as to be slidable in the front-rear direction, and an engagement groove 16 on the outer periphery that engages the protrusion 13' provided on the inner surface of the acupressure piece 13. ' is provided, and when the protective ring 16 slides forward, it is located between the acupressure piece 13 of the detachable lever and the recessed part 15, as shown by the imaginary line in FIG. 1, and the protrusion 13' Engagement groove 1
6'.

Effects of the invention Therefore, according to the present application, by sliding the protective ring forward and positioning it on the lower surface of the acupressure piece of the attachment/detachment lever, the pressing of the acupressure piece of the attachment/detachment lever is prevented except when the cutting bar is attached or detached. This eliminates the danger of the cutting bar flying out from the grip during work due to the rotation of the cutting bar, allowing safe use.Furthermore, the sliding position of the protective ring allows the acupressure piece to be placed in a position where acupressure can be applied. It is possible to easily check whether the finger pressure is applied or not, and the engagement between the protrusion of the acupressure piece and the engagement groove of the protective ring makes it possible to reliably maintain a state in which the acupressure of the acupressure piece is negated.

[Brief explanation of the drawing]

FIG. 1 is an overall partially cutaway side view showing an embodiment of the present application, and FIGS. 2 and 3 are partially cutaway overall side views showing a conventional cutting tool. In the figure, 2...Gripping part, 3...Pressing part, 5...Shaft tube, 6...Cutting bar, 7...Chuck, 9...Rotating shaft, 11...Spring, 13...Shiatsu piece, 1
4... Attachment/detachment lever, 16... Protective ring.

Claims (1)

[Scope of utility model registration request] In a dental cutting tool configured to attach and detach the cutting bar by pressing a finger pressure piece of an attachment/detachment lever protruding from the outer periphery of the grip, a finger pressure piece of the attachment/detachment lever is applied to the rear outer periphery of the grip. A dental cutting tool comprising a protective ring slidably fitted in a position intervening between the acupressure piece and an engagement groove for engaging a protrusion provided on the inner surface of the acupressure piece on its outer periphery. .