DE3002276C2 - Device for divesting the plaster mold from the cuvette in the dental prosthesis production - Google Patents

Description

2. Device according to claim 1, characterized in that that the cutting tools (13) are three square chisels, which each have a spring receiving sleeve (15) connected to one hydraulic cylinder (2, 3 and 4) are guided and moved, wherein a spring in the unpressurized state takes care of the resetting of the cutting tools.

3. Apparatus according to claim 1 or 2, characterized gekennzeichne'- that for generating the hydraulic Pressure a common (! ^ Reservoir (6) and supply pressure cylinder ^ <: r (5) used which the latter are connected to the hydraulic cylinders (2-4) by separate pressure lines (9) is, and that by means of a lever (0) via a Piston rod and piston (7, 8) of the supply pressure cylinder (5) simultaneously and evenly in Hydraulic pressure is generated in all cylinders.

4. Apparatus according to claim!, Characterized in that da3 a bow! (19) with slotted and countersunk receptacle for a U-bolt (21) and associated handle with threaded rod (20) so pivotable on one of several, the bracket (19) with screwed-in threaded rod (20) carrying support column (30) is attached in such a way that it Can be swiveled over the cuvette and provided with the U-screw «(21) on the opposite one Support column (21, 30) can be locked in place and by means of the threaded rod with handle (20) and the loose cuvette lid (18) the cuvette can be locked via a limiting bracket (31).

with the pressure of 31 when taking it out of the press preserved. Then, at the end of the cuvette, insert a capsule into the opening provided for this purpose. filled with liquid plastic (methyl methacrylate),

inserted, and the contents injected under 3atü pressure. After approx. 5 minutes, the cuvette and the frame are placed in a water bath for approx. 35 minutes 95 ° and then cooled. After cooling and releasing the pressure, the stenter frame is

ίο loaded again with 31 pressure, the locking blade removed and removed the cuvette from the clamping frame.

Now the actual divesting of the plaster mold begins from the cuvette, which consists of 2 halves. The invention has the sole purpose of embedding the

is plaster mold, which is undamaged from the cuvette halves should be taken out. So far, the plaster moldings were each after removing the two The lid was knocked out with a hammer, which, however, had major disadvantages, namely:

- Shifting of the cuvette rims

- Destruction of the cuvette by cracks

- cracking of the prosthesis

- The plastic teeth crack

- Frequent damage to the plaster mold

- Often time consuming process

The invention is based on a device for detaching the two Cüvcttcnhälften from the plaster molding, as is customary in the manufacture of artificial dentures and dentures using injection molding technology the preamble of the main claim i.

With the usual methods of artificial injection becomes the complete cuvette after it has been used for The denture has been prepared for pouring. placed in a tenter frame. The clamping frame is loaded with J t pressure, so that both halves of the cuvette with the plaster molding lie completely close to each other. Then a locking blade is thrown on the stenter, ilu-Eine Device for removing the plaster mold from the cuvette in the manufacture of dentures is although also known from US Pat. No. 2,253,950. The disadvantage of this device over the present one Invention, however, is to be seen in the fact that that device is not hydraulic, but mechanical Pressure works and therefore an even, gentle removal of the plaster mold from the cuvette is not guaranteed. In addition, separate levers that can be operated manually at the same time are required and require manual dexterity.

In the German Auslcgeschrift 20 37 183, a device for emptying casting muffles in the production of dental prosthesis cast parts is described, which describes the removal of molding material from casting muffles by means of hydraulic pressure. However, like the present invention, this invention does not relate to the separation of cuvette halves with simultaneous removal of the plaster of paris mold, but rather to the pressing out of the molding material including the casting from the muffle. In contrast, removing the plaster of paris form from cuvées is considerably more difficult. The adoption of this principle of separation by hydraulic pressure for removing plaster molds from cuvettes, known from casting technology, is also not to be regarded as obvious, because the separation of cuvette halves while simultaneously removing the plaster mold is considerably more difficult. In relation to the status quo, the present invention solves the problem of creating a simple device that securely separates the two cuveity halves with one hand movement and thus the plaster molding in which the prosthesis M) is cast. exposed undamaged, in a surprisingly simple and inexpensive manner both in use and in technical construction with the features specified in the characterizing part of the claim. As the description below shows. h ^r> are avoided the disadvantages of the known devices.

A single cutting tool is not sufficient to solve the problem; rather, there are several

Separating tools that work simultaneously and evenly on the other sides are necessary.

The structure of an exemplary embodiment of the present invention is composed as shown in FIG. 1, 2 and 5 can be seen from the following basic components:

- Aluminum base plate 1

- hydraulic cylinder 2

- hydraulic cylinder

- hydraulic cylinder 4

The three hydraulic cylinders 2, 3 and 4 are distributed in this way mounted on the base plate so that a cuvette can be inserted in the middle. All hydraulic cylinders are adjustable and can be set up to accommodate other cuvette shapes. Laterally of this arrangement the supply pressure cylinder 5 is mounted on the supply cylinder is seated the oil reservoir 6. The hydraulic cylinders 2,3 and 4 are connected to the supply pressure cylinder 5 by pressure lines 9. Printing cylinder 5 is through Lever 0 actuated with piston rod 7. Piston rod 7 presses on piston 8 (FIG. 5) and this now presses the oil from the reservoir 6 into the pressure lines 9 to the pistons 10, 11 and 12 of the hydraulic cylinders 2, 3 and 4.

Structure of hydraulic cylinders 2, 3 and 4 (Fig. 5):

Pistons 10, 11 and 12 each have a thread receptacle for the cutting chisel 13. On the back of the A sealing collar 14 is provided for each piston; the oil comes from line 9 behind the sleeves 14 and presses the separating lever 13 outwards. The separating chisels 13, which are fixed to the pistons 10, 11 and 12 respectively are connected, slide through one of the spring receptacles 15. When you take back the lever 0 press now the compression springs 16, the cutting chisels 13 back into the starting position. The pistons 10, 11 and 12 are identical in structure. Of the separating means 13, the right and left are identical in structure The middle one has a slightly different shape due to the shape of the cuvette (see Fig. 1).

inserts. The cutting bits 13 are at their front ends designed so that their tips of 90 ° at an angle exactly into the recesses provided penetrate at the dividing line between the cuvette halves.

Explanation of the separation according to the invention (Figs. 1-4)

10 As can be seen from Fig. 1, bracket 19 is pivoted out, the cutting chisels 13 are in the rest position. U-bolt 21 is open, limiting bracket 31 is unfolded. Control lever 0 of the supply pressure cylinder

Is the other S is at the very back in the rest position.

Lid 18 is placed on the cuvette, bracket 19 for U-bolt 21 swiveled in. This is tightened with half a turn to the right. The handle with The threaded rod 20 is tightened on the cover 18 (FIG. 2). This means that only the plaster molding is in the cuvette recorded, the cuvette itself left "; / free. The limiting bow 31 is folded up, the operating lever 0 is pressed forward against the stop 23. As a result, pressure is applied to piston 8 in the supply pressure cylinder 5 via the piston rod 7. Of the Pressure is passed on through the pressure lines 9 into the hydraulic cylinders 2, 3 and 4, the pistons 10, 11 and 12 thus press the cutting chisels 13 in the direction of the cuvette, so that their tips are in the designated areas Recesses in the dividing line z-yischen the

Penetrate the cuvette halves and the upper half

push the top and the bottom down, as if out

F i g. 3 and 4 can be seen. After separating the cuvette halves, the

Compression springs 16 and the removal of the pressure when returning the operating lever 0 for the fact that the Separating chisels 13 come back into the rest position (FIG. 1). After loosening the handle with the threaded rod 20 is the U-screw 21 with half a turn

rotation to the left and the swivel bracket 19 back into the position according to FIG. 1 brought. The boundary stirrup 31 is folded back so that the cuvette with the now loosely inserted plaster molding ent can be taken.

List of the individual parts of an embodiment of the device according to the invention for devesting the plaster mold (Figs. 1-6)

Structure of the cuvette holder (Fig. 1 - top view - and F i g. 2 - front view)

50

After filling the cuvette with the plaster of paris, the top and bottom are each closed with a lid. To During the process, as explained on page 1, second paragraph of the description, the cuvettes are attached to the clamping frame removed and the two lids removed before devesting. The plaster molding, in that the prosthesis is cast in, visible. The depth from the edge of the cuvette to the plaster molding is 10 mm and corresponds to the depth of the lid. ω

On the base plate 1, a cover 17, which is somewhat modified compared to the usual, is fixedly mounted, which corresponds to the upper shape of the visible plaster molding.

The height of the cover 17 is dimensioned so that the dividing line between the cuvette halves is exactly at the same height the tips of the three cutting chisels 13 come to rest when the cuvette is turned upwards with the nose

0 control lever

1 base plate

2 hydraulic cylinders

3 hydraulic cylinders

4 hydraulic cylinders

5 units supply pressure cylinder

6 oil storage tanks

7 piston rod

8 pistons to 5

9 pressure lines to 2, 3 and 4, coming from 5

10 pistons for 2

11 piston for 3

12 pistons for 4

13 dividing dimensions!, 3 pieces

14 cuffs, 8 pieces

15 spring sleeve, 3 pieces

16 compression springs, 3 S ^ ück

17 Fixed lid on 1 below

18 Loose cover on top

19 bracket / swivel around

2O threaded rod with handle

21 U-bolt

22 stop pin

23 Stop for operating lever 0

30 support columns for bracket 19

31 Boundary Bars

In addition 6 sheets of drawings

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Claims (1)

Patent claims: 1. Device for removing plaster molds from COvettes during the manufacture of dental prostheses, Consists of a base plate with attached bracket and clamping parts to be taken up and locking the cuvette, one of the clamping parts cuvette lid held down and loosely resting in the center of the plaster mold. rn, it from the side cutting tools that engage in the recess at the dividing line between the upper and lower half of the cuvette for separating the upper half of the cuvette with the plaster mold held down, thereby characterized in that the cutting tools are designed chisel-like that hydraulic cylinders (2-4) are provided through which the through them actuated cutting tools (13) moved axially with hydraulic pressure and into the recesses on the Separating lines are pressed between the cuvette halves can be. so that the upper half of the cuvette can be separated and the plaster mold can be exposed.