US1799695A - Dental apparatus - Google Patents

Description

April 7, 1931.

P, MANTERNA'CH' DENTAL APPARATUS Filed July 9, 1929 2 Sheets-Sheet 1 1 N VEN TOR.

A TTORNE Y.

April 7, 193 P. MANTERNACH DENTAL APPARATUS Filed July 9. 1929 2 Sheets-Sheet 2 I N VEN TOR.

A TTORNE Y.

Patented Apr. 7, 1931 PATENT OFFICE PAUL MANTERNACH, OF ST. PAUL, MINNESOTA DENTAL APPARATUS 9 Application filed July 9, 1929. Serial No. 376,975.

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The present invention relates to improvements in dental apparatus and has reference more particularly to a device for use in eliminating the wax from the mold by the action of heat. 7

One of the important objects of the present invention is to provide a dental apparatus that includes an electric furnace or muflle mounted upon a suitable base and within which furnace or muffle is adapted to be removably positioned, the flask or mold containing the wax pattern that is used by dentists in castin bridgework inlays.

A further 0 ject is to provide a dental apparatus of the above-mentioned character wherein an ejector unit is operatively associated with the furnace for submitting the ready and easy ejection of the flask or mold from the furnace or muflie after the wax pattern has been eliminated.

' Another important object of the invention resides in'the provision of a dental apparatus of the above-mentioned character which will expedite the work in preparing inlays I and this in a positive and eflicient manner,

the parts of the device embodying my invention being so arranged as to permit the same to be readily and easily assembled or, disassembled.

-A still further object is to provide a dental apparatus of the above-mentioned character which is simple in construction, inexpensive, strong and durable and further well adapted for the purposes for which it is designed.

Other objects and advantages of the inven' tion will become apparent from the following description when taken in connection with the accompanying drawings.

In the accompanying drawings wherein like reference characters indicate corresponding parts throughout the same;

Figure 1 is a top plan view of the dental apparatusembodying my invention, a portion of the furnace or mufile being shown in section.

Figure 2 is a side elevation of the apparatus, a portlon of the base being shown in sectlon to more clearly disclose the mounting for the electric switch.

. the edges thereof being disposed downwardly to provide side and end flanges. The corner portions of the flanges are constructed to form supporting feet 2 thereby to space the base 1 from the surface as clearly shownin Figures 2 and 4 of the drawings.

Mounted on the base 1 at one end thereof is the electric heating furnace or muffl'e denoted generally by the numeral 3. This heater embodies inner and outer spaced metallic shells 4 and 5 respectively having flanged top and bottom cap members 6 and 7 associated therewith. Aheating coil 8 consisting of spirally wound nichrome wire encircles the inner shell 4t and is maintained out of contact with the inner shell 4 through the medium of the insulating material 9 which may be mica. Mineral wool, denoted by the numeral 11 fills the space between the heating coil and the outer shell 5 as is clearly indicated in Figures 1 and 4 of the drawings.

Suitable bolts 12 extend through the top and bottom cap members 6 and 7, the heads of the bolts engaging with the upper face of the top cap 6 while the threaded ends of these bolts extend through apertured protuberances 13 that extend upwardly from the base 1 for engagement with the bottom face of the bottom cap 7 to space the heating furnace 3 from the base. Suitable nuts 14 are threaded .on the lower ends of the bolts for engagement with the bottom face of the base 1 as shown very clearly in Figure 4:.

Current is supplied to the heating coil 8 from any suitable source and the lead in wires are shown at 15, the same carrying at their free ends the quick detachable plug 16 that is of the conventional construction for association with a wall socket or the like (not shown).

A snap switch 17 also of any conventional construction is mounted on the base 1 for association with the wiring 15 to control the turning on and off of the current to the heating coil 8 and this switch unit is detachably mounted on the base 1 in the manner as shown at 18 in Figure 2.

The base 1 is formed with a circular opening 19 directly beneath the open central portion of the heater 3 and extending vertically through the opening 19 for movement through the central portion of the heater 3 is the tubular standard 20 that carries at its upper end, the mold or flask supporting spider 21, the ends of the arms thereof terminating in slight spaced relation with respect to the inner shell 4:.

The lower end of the standard 20 is slit to accommodate the forward end of the longitudinally extending lever or arm 22. This lever or arm is pivotally connected with the lower end of the tubular standard 20 as at 23. The intermediate portion of the arm or lever 22 is disposed between a pair of depending guides 24 that are secured at their upper edge portions to the under side of the base 1 and the lever or arm is pivotally mounted adjacent its rear end at the rear end portion of these guides as at 25. The actuating means for the lever 22 comprises a finger operated pin 26 that extends through a suitable opening provided in the rear end portion of the base 1. This pin is also operable within an inverted U-shaped bracket 27 that is secured on the base 1 over the opening 28 and the upper end portion of the pin 26 is operable through an opening formed in the crown portion of this bracket 27. A flange 29 is formed on the intermediate portion of the pin 26 to prevent displacement of said pin. The lower end of the pin rests on the upper face of the rear end portion of the pivoted lever or arm 22 and a screw 30 is threaded through a transverse opening formed in the rear extremity of the lever arm 22 for engagement with the under side of the adjacent portion of the base 1 whereby the limit of the downward movement of the standard 20 and the spider 21 supported on the upper end thereof may be limited.

The operation of my improved dental apparatus is thought to be readily obvious from the construction disclosed and it is apparent that when the mold or flask containing the wax pattern is placed in the electric heater 3, and the switch 17 is turned on, the heating coil 8 will dissolve the wax in the mold employed in the preparation of models or investments for inlays. The surplus moisture in the investment will be evaporated out slowly and the wax pattern dissolved and absorbed in the investment or evaporated by the application of heat to the mold or flask.

By pressing the pin 26 downwardly, the lever or arm 22 will be actuated whereby to raise the standard 20 and the spider 21 carried on the upper end thereof upwardly through the shell 4 so as to eject the mold or flask from the furnace.

When pressure on the pin 26 is released, the weight of the spider and supporting standard will automatically return the movable parts to their normal positions as shown in Fig ure 4.

It will thus be seen from the foregoing description, that I have provided a dental apparatus that will expedite the removal of the wax from the mold and at the same time provide a means for ejecting the mold from the furnace or muffle. The simplicity of my device enables the same to be constructed at a very low cost and yet be strong and durable and further at all times positive and efficient in carrying out the purposes for which it is designed.

WVhile I have shown the preferred embodiment of my invention, it is to be understood that minor changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the appended claims.

What I claim is:

1. A dental apparatus comprising in combination, a base, an electric heating furnace mounted thereon and adapted to receive a dental flask, and a flask ejector mechanism including a standard arranged for vertical movement through the base and the bore of the heater, a flask engaging unit carried by the upper end of the standard, a lever pivoted intermediate its ends beneath the base, one end thereof being operatively connected with the lower end of the standard, and manually operable means for the other end of the lever to raise the ejector unit, said last-mentioned means including a vertically movable pin mounted on the base, the lower end thereof having engagement with the adjacent end of the pivoted lever.

2. A dental apparatus, comprising in combination, a base, an electric heating furnace mounted thereon and adapted to receive a dental flask, and a flask ejector mechanism including a standard arranged for vertical movement through the base and the bore of the heater, a flask engaging unit carried by the upper end of the standard, a lever pivoted intermediate its ends beneath the base, one end thereof being operatively connected with the lower end of the standard, and manually operable means for the other end of the lever to raise the ejector unit, said last-mentioned means including a vertically movable pin mounted on the base, the lower end thereof having engagement with the adjacent end of the pivoted lever, and means carried by the last-mentioned end of the lever for cooperation with the base to limit the downward movement of the standard and the ejector element carried by the upper end thereof.

In testimony whereof I aflix my signature.

PAUL MANTERNACH.

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