DE7828568U1 - Excavator for dentistry - Google Patents

Description

- 3 - 19.056 40 / kr

Hawe-Neos Dental Dr. H. von Weissenfluh SA
6925 Gentilino / Switzerland

Excavator for dentistry

The cutting edge of the spoon-shaped end portion is made by grinding

The well-known excavators for dentistry - these are instruc- tions

ments or tools with which the dentist cleans the carious teeth |

parts removed by hollowing out - have a handle attached to its f

End has a tip in the form of a very small spoon, des- I

sen front edge is ground sharply to the carious tooth part |

to be able to remove by scratching out. f

the lower surface of the spoon when making the tool! as well as by sharpening the upper surface along the cutting edge I by means of a grindstone. f

To regrind the tool, the dentist can use the grindstone, proceed as mentioned above.

The disadvantage of the known tools is that the mechanical strength of the tool tip is very low due to its thin Ausbildur.c, so that it often breaks off after the
The cutting edge has been sharpened a few times from above.

In addition, the cutting angle is increased with each re-sharpening of the cutting

"μ! Jm

The edge is more pointed, which makes it harder and harder to hollow out the tooth vjlird.

The invention is therefore based on the object of creating an excavator in which the above-mentioned disadvantages are eliminated and its cutting edge is very stable ", so that the cutting surface can be sharpened very easily and reliably.

This object is essentially achieved in that, by grinding, the hollowing or scraping tip below the Cutting edge essentially as a frustoconical surface is formed, namely along an axis which is perpendicular to the longitudinal axis of the Aushöhlspitze in etv / a.

According to a preferred embodiment, the semi-truncated cone takes shaped surface has an inclination angle between 26 and 36 with respect to the axis, the value preferably between 30 ° and 31 °.

In contrast to the known excavators, remains according to the invention the angle of inclination always unchanged, even if the cutting edge is sharpened.

Further advantages, features and details of the invention result can be derived from the following description of an exemplary embodiment based on the accompanying drawing. In the drawing represent:

Figure 1 is a side view of an excavator according to the invention,

Figure 2 is a side view of the tip of the excavator after compression molding,

Figure 3 is a view from below of the shown in Figure 2

_ C -

formed tip,

Figure 4 is a plan view of the tip shown in Figure 2,

Figure 5 is a side view of the tip shown in Figure 2 after grinding,

FIG. 6 shows a view from below of the ground tip of FIGS. 5 and

FIG. 7 shows a plan view of the ground tip of FIG. 5.

According to Figure 1, the ExkäVitor is designed as follows: The handle 1 is provided with the tips 2 and 2 ¹ . Each of the two tips is shaped by pressing as shown in FIGS. 2, 3 and 4, and then ground as shown in FIGS. 5, 6 and 7.

According to the invention, the bevel is below the cutting edge BCD (Figures 5 and 7) carried out in such a way that a substantially frustoconical surface is formed, the half-base BCD (Figure 6) and half-deck surface KEL with the two straight lines Side panels KP and LQ are connected.

The axis of this frustoconical surface - indicated by N in Figure 5 - runs perpendicular to the longitudinal axis HM of the tip 2, the angle of inclination cC between the surface line EC on the frustoconical surface and the axis CG, which runs parallel to the axis ON, about 30 ° to 31 ° and should in any case be between the values 26 ° and 36 °.

■ "O" *

In this way, great stability of the point and a very great cutting effect are ensured, so that the

• ^{: The} excavator can be used for a long time without the cutting edge having to be resharpened.

S The tip, usually made of Martens' hardenable stainless Steel can consist of a hard material or a

; Material be produced by cementation or by any other another process is hardened. In addition, it can also have a small sheet made of valuable hard material that is attached to the highest point of the tip 2 is soldered, which is made of a less valuable material, as it is with a lathe tool is common among other things.

Pie hardening can also be a surface layer of borides, nitrides, Carbides or other suitable compounds or by a galvanic coating of chromium or other hard metals Will.

Claims (1)

19.056 40 / kr Γ, · \ ΤΤ PiT ₁ ANW? \ LTE
-. rcr. Tiat. DiETEl LOU15
: -l -Fnys. CLAUS PSHLAW NORNBSRQ lawe-Neos Dental Cr. H. von Weissenfluh S.A. Gentilino / Switzerland Expectations Excavator for dentistry, characterized in that the hollow point below the cutting edge to a substantially frustoconical surface (DCEB) is ground, with the axis (NO) approximately perpendicular to the Longitudinal axis (HM) of the hollow point stands. Excavator according to claim 1, characterized in that the Angle of inclination between the surface line (EC, Figure 5) on the frustoconical surface and the axis (NO, to CG running parallel) is from 26 ° to 36 °, preferably between 30 ° and 31 °. Excavator according to Claim 1, characterized in that the tip is hardened by cementation. Excavator according to one of Claims 1 to 3, characterized in that that the tip has a surface layer of borides, nitrides, carbides or other suitable compounds for the purpose of hardening on v / eist. Excavator according to Claims 1 and 2, characterized in that the tip is coated with a galvanic coating for the purpose of hardening Chrome or hard metals on v / ice » • ■ * < 6. Excavator according to claim 1 and 2, characterized in that a leaflet is formed at its highest point to form the tip valuable material is associated with a less valuable material.