DE8808416U1 - Tool for producing casting base formers for casting muffles - Google Patents

Description

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Rainer Oetken, Hauptstrasse 44, CH-8280 Kreuzungen

Tool for producing cast iron base molds for cast iron muffles

The invention relates to a tool for producing casting base formers for casting muffles.

When casting dental work, casting base formers are used for the casting muffles. These casting base formers are wearing parts, so they must be replaced after a long period of use*

The invention is based on the task of creating a tool that enables the dental technician to create such casting sock formers himself.

According to the invention, this object is achieved by a bowl-shaped base body with a base on the bottom of the in&mdash;

Dipl.- Ing· Dipli- Oek, Niemartnsweg 133 I

JÄISS £r - TÖNNIES 23ÖO KlIEL

Attorney and Patent Attorney Tel. 0431/84075

RA J, G. Tönnles, Hieiannsie* 133, 1300 Kiel 1 BiakW &bgr;* 2U BLZ 211 900 Öf

To the

German Patent Office

Zweibrückenstr* 12

Munich -2

on

Your reference Your letter My reference Kiel, *·&sgr;. New registration O 5001

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inner wall, a centering ring running around the circumference and a bore penetrating the center of the base, an essentially cylindrical first insert, the outer diameter of which corresponds to the inner diameter of the centering ring and which is provided on one side with a coaxially tapered recess with a cylindrical section at its tip, and a rotationally symmetrical stand with a T-shaped cross-section, the outer diameter of the stem of the stand corresponding to the inner diameter of the cylindrical section of the recess.

A preferred embodiment is characterized by a second insert for producing mixing cups, the outer diameter of which corresponds to the inner diameter of the centering ring and which is tapered upwards in the shape of a truncated cone.

The invention is explained below with reference to a drawing.

It shows:

Fig. 1 is a sectional view of such a tool, and

Fig. 2 is a representation of its second use.

The tool proposed here consists of a cup-shaped base body 10, which is provided with a centering ring running around the bottom of the inner wall, the thickness of this centering ring in the horizontal direction being equal to the thickness of the wall of the casting to be produced.

The base 14 of the grid body 1Ö is further provided with a centrally penetrating bore 16, which serves to blow out the cast base former created when the tool is filled with a silicone compound or the like.

A first, essentially cylindrical insert 18 is inserted into the cup-shaped base body 10, the outer diameter of which corresponds to the inner diameter of the centering ring 12. This first insert 18 is provided on its upper side with a coaxially tapered recess 20, which ends in a cylindrical section 22 at its tip. A stand 24 is inserted into the conical recess 20, in which the outer diameter of the stem corresponds to the inner diameter of the cylindrical section 22 of the recess 20.

To produce a cast base former, the tool is assembled as shown in Fig. 1. A self-hardening compound, preferably a silicone compound, as is available to the dental technician as duplicating compound (mold material), is then poured into the tool. After hardening, the cylindrical insert 18 is blown out by inserting a compressed air gun into the hole 16 together with the cast base former formed during hardening. The insert 18 is then removed, with the stand 24 remaining in the cast base former, giving it the necessary stability and also forming a sleeve for attaching the work to be cast. This stand 24 can be recovered after the cast base former has worn out.

Fig. 2 shows a second insert 26 which is to be inserted into the cup-shaped base body 10 when the tool

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tool used for hets^ilsn a mixing cup much should I.

The tool proposed here for creating casting base formers for casting molds has the advantage that the dental technician can produce casting base formers himself at low cost if required. Another advantage is that when investment material is used to form the casting mold, these are particularly smooth but slick, so that dust particles do not settle on them.

Claims (2)

fdxteiCb -&Igr;&Ogr; 5001 CLAIMS 1. Tool for producing casting base formers for casting muffles, marked by - a bowl-shaped base body (10) with a centering ring (12) running around the bottom of the inner wall and a bore (16) penetrating the center of the bottom (14), - a substantially cylindrical first insert (18), the outer diameter of which corresponds to the inner diameter of the centering ring (12) and which is provided on one side with a coaxially tapering recess (26) provided with a cylindrical section (22) at its tip» and - a rotationally symmetrical, T-shaped cross-section stand (24), wherein the outer diameter of the stem of the stand (24) corresponds to the inner diameter of the cylindrical section (22) of the recess (20). 2. Tool according to claim 1, characterized by a second insert (26) for producing mixing elements, the outer diameter of which corresponds to the inner diameter of the centering ring (12) and which is designed to taper upwards in the shape of a truncated cone.