DE8615790U1 - Holder for spark erosion electrodes - Google Patents

Description

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Holder for spark erosion electrodes

The invention relates to a holder for spark erosion electrodes for processing dentures or the like. with two radially outwardly protruding from a clamping shank, at the outer end clamp brackets for the support arms having electrodes.

When machining dental prostheses, it is often necessary to use spark erosion to make cutouts in predetermined ones Incorporate cross-sectional shape into the prosthesis, which has become common practice for reasons of rationality, Provide holder on which two support arms are attached, so that two possibly different at the same time Electrodes can be held and thus processing can be carried out at two different points on a prosthesis at the same time can take place.

It has been shown, however, that the previously provided arrangements with two diametrically opposite one another Support arms are often not suitable for simultaneous processing, since the Sinsatzorte with such rigid bracket cannot be reached at the same time.

To avoid these difficulties is therefore according to the invention provided that at least two support arms rotate individually and are held longitudinally adjustable on the clamping shaft.

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The arrangement according to the invention makes it very simple Way possible the several support arms for each one spark erosion electrode to change both in their angular position to each other, as well as in the radial length, so that practical Spark erosion machining at any point on a prosthesis at the same time can take place. Obviously, there is not even one restriction to what has been customary up to now Two-arm construction against * but one could also in the same way - although this only in exceptional cases expedient and also necessary - three or more support arms and a corresponding number of spark erosion electrodes at the same time insert.

With particular advantage it can be provided in a further development of the invention that the clamping shaft penetrates elongated holes of the support arms, which lie one above the other between an upper contact shoulder of the clamping shaft and a locking nut of the clamping jaws that can be screwed onto its lower threaded end. Through this design a very simple operation is in einfachster design possible by it is only necessary to loosen the lock nut a little, then adjust dia individual carrying arms with a handle to the desired angular position radial deployment relative to the axis of the shank, whereupon it single borrowed necessary is to retighten the locking nut and fix the found orientation.

Finally, it is also within the scope of the invention that the clamping shaft, at least in the upper section, has an in Lateral loop connection supports opening out axial coolant bore has, as connected to the coolant connections of the support arms via flexible hose lines. on

this way, despite the universal adjustability of a multi-electrode holder according to the invention, a | Ensure optimal cooling of the electrodes _s the | Previously provided rigid coolant lines was missing * ff This internal coolant supply also has considerable advantages over the flexible metal ring hoses that are also already provided, because although these can be tracked to the changed position of an electrode, there is always the risk that they will be caused by vibrations and with no longer maintain their beam direction for longer periods of operation. In addition, these metal ring hose lines are always in the work area and disturb the technician when making adjustments and monitoring.

Further advantages, features and details of the invention emerge from the following description of an exemplary embodiment, as well as based on the drawing. Show:

Fig. 1 is a partially sectioned view of an inventive Two-electrode holder and |

FIG. 2 shows a step section along the line H-II in FIG. 1.

The holder shown for two spark erosion electrodes initially comprises a clamping shaft 1, which is also used as Power supply can be plugged into the spark erosion machine, as well as two rotatable and longitudinally adjustable support arms 2 and 3 held thereon. These two support arms are at the outer end with a longitudinal bore 4 as well a locking screw 23 is provided for clamping brackets 20 for spark erosion electrodes comprising the electrodes, wherein these spark erosion electrodes can have different working cross-sections depending on the requirements. The deadlock the clamping brackets 20 in the bearing bores 5 of the support arms takes place by means of the locking screws 24. Inside Section have the support arms 2 and 3 elongated holes 6 and 7,

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which are penetrated by a lower tapered portion 8 of the clamping shaft 1, so that the support arms both around the £ inspannsc-haft 1 rotatable, as well as in its radial design are adjustable. Knurled nuts 9a, 9b on the lower threaded section are used to fix the respective position 10 of the clamping shaft 1 can be screwed to the superimposed support arms 2 and 3 against the shoulder 11 formed at the end of the tapered section 8 or the one above it To tighten knurled nut 9a. The provision of two knurled nuts enables completely independent adjustment of the two support arms 2 and 3. In the upper section is the clamping shaft 1 with an axial coolant supply bore 12 provided that are inserted into the side hose connectors 13 and 14 opens out, which via flexible hose lines 15 and 16 are connected to the coolant connections 17 and 18 of the support arms 2 and 3. The coolant arrives via the annular grooves 21 and the longitudinal channels 22 of the clamping brackets 20 without disturbing hose lines have to be led into the work area, directly to the clamped electrodes. By «Xial displacement of the clamp brackets 20 can flush be turned off.

Claims (4)

Protection claims 1. Holder for spark erosion electrodes for processing dentures or the like. with support arms protruding radially outward from a clamping shank and having clamp holders for the electrodes at the outer end, characterized in that at least two support arms (2, 3) are held on the clamping shank (1) so that they can be individually rotated and longitudinally adjusted. 2. Holder according to claim 1, characterized in that the clamping shaft passes through elongated holes (6, 7) of the support arms (2, 3), which are superimposed between an upper contact shoulder of the clamping shaft (1) and a knurled nut which can be screwed onto the lower threaded end (10) (9a) or between the two knurled nuts (9a, 9b) can be clamped. 3. Holder according to one of claims 1 or 2, characterized in that the clamping shank (1) at least in the upper portion of a lateral hose connection piece (13, 14) has opening axial coolant bore (12) which is connected to the coolant connections via flexible hose lines (15, 16) (17, 18) of the support arms (2, 3) is connected. 4. Holder according to one of claims 1 to 3, characterized by axially displaceable clamping bracket inserts (20) of the support arms (2, 3) with an annular groove (21) and longitudinal grooves (22) for the coolant distribution. IHl IHl ft t »Lit · • ■ * (ι ti * I 111 I.