US1536079A - Dental burner - Google Patents

Description

May 5, 1925.

E. E. DALTON DENTAL BURNER-' F1133 FeE. 23. 1923 Patented May 5, 1925.

UNITEDSTATES ERNEST E. DALTON OF CHICAGO, ILLINOIS.

DENTAL BURNER.

Application filed February 23, 1923.

To all whom it may concern Be it known that I, ERNEST E. DALToN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful In'iprovement in Dental Burners, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

The present invention relates to burners, and more specifically to a design of burner having particular utility in dental laboratories for performing certain dental operations. p

(hie of the princi al objects of the invention is to provide a burner which will elin1inatethc was from dentalcasting cases with more uniformity, thoroughness andexpediency. The preferred embodiment of burner by which. I accomplish this object comprises a. circular burner tube having a plurality of inwardly opening burner jets arranged aroiuid its inner circumference for project ing flames radially inward against the circular sides of the casting ring. This distributes the heat uniformly around the sides of the casting ring wherethe heat should be applied, and results in an even, thorough drying of the investment and elin'iination of the wax.

A. further object of the invention is to provide an adjustable support for the casting case, whereby the case can be raised or lowered to cause impingement of the radial jets of flame at any pointalong the casting case, or for accommodating casting cases of different sizes.

A further object is to provide an adjustable support for the burner which can be raised above the plane of the burner ring, whereby the device may be employed for heating cases for soldering.

A further object is to provide a device which, in addition to performing the above heating operation, will have all the other uses and utilities ofthe old style Bunsen burner. v

In the accompanying drawing illustrating a preferred embodiment Figure 1 is a perspective view of the burner unit, showing the mode of eliminat ing wax from casting cases;

Fig. 2 is an end elevational view of the burner unit;

1* 5 is a horizontal sectional view taken Serial No. 620,801.

approximately on the plane of the line 8-3 F of Fig. 2 and Fig. 4 is a fragmentaryend elevation of a modified embodiment.

The device is assembled'upon a base plate 1. Two tubular standards 3 and l rise from this base plate, preferably having reduced extensions at their lower ends which are riveted or expanded in holes in the base plate. A valve housing 5 is cast integral with the lower ends of the standards 3 and 4 and is provided with a gas inlet in the form of a nipple tube 6 for receiving the end of the gas hose.

Extending upwardly from the upper end of the standard 3' is a burner tube 8 of wrougl'it tubing. The upper end of the tube 8 is bent into a horizontal circular loop 8 having a plurality of radial jets or ports 9 around its inner circumference. The end of the tube is closed at 11 by pressing the walls thereof together, or soldering or plugging the end of the tube in any other preferred manner. 'lheadjustable support for carrying the casting case or other article being heated, comprises a block 12 slidably mounted on the vertical portion of the tube 8 and carrying a rod 13, which is rigidly anchored in the block 12. The upper end of therod 13 is bent into a horizontal circular loop 13, similarly to the tube 8, but the loop 13 is of smallerdiameter than the loop 8, so that it can be passed up and down through the burner ring by sliding the block 12 up or down along the vertical portion-of the tube 8. A thumb screw 14 screws into the back of the sliding block 12, and affords a clamping meansfor clamping the block to the tube 8 withthe supporting ring 13 at any desiredheight relative to; the burner ring 8'.

Risingfrom the other standard is a typical Bunsen burner tube 15. Each'standard 3 and 4 is provided with a plurality of air ports 16 around its polygonal sides for ad,- mitting air into the stream of flowing up through their respective burner tubes.

The valve housing 5 is formed with a valve socket, preferably of tapering form, for receiving the rotatable valve 17. As shown in Fig. 3, this valve is hollow to form a central chamber 18 from which radiates the plurality of ports for controlling the flow of gas to the respective burner tubes .8 and 15. An operating arm 19 extends laterally from the top of the valve element 17. Formed in line with the operating arm 19 is a relatively large inlet port 21 which is adapted to register with the inlet passageway 22 leading from" the nipple 6. Vhen the port 21 and passageway 22 are in regis-, try, as shown, a relatively large port 23i's also in registry with a passageway 2 1 leading to the burner tube 8, and a relatively large port 25' is also in registry with a passageway 26 leading to the Bunsen burner tube 1.5. It will therefore be obvious that in this position of the operating arm 19, both burner tubes receive a full supply of gas for maximum heating at each burner tube, By slightly turning the operating arm;19 to either side, the registering areas of the ports 21, 23 and 25 can be reduced for cutting down the flow of gas to each burner tube and thereby diminishing its intensity 7 of flame.

In close proximity to the port 23, the valve is provided with a companion port 27, and in close proximity to the port 23 and located on the other side thereof is another companion port 28. By rotating the operating arm 19, clockwise into dotted line position a the port 27 is brought into registry with the passage 24:- leading to the burner tube 8, and the port 28 is brought into registry with the inlet passageway 22. At this time the passageway 26 leading to the other burner tube is blocked off by a solid portion of the valve, whereby all the'gas is diverted into the burner tube 8. By rotating the operating arm 19 to the other side into dotted line position b, the flow is shunted into the Bunsen burner tube 15 and cut oltfrom the circular burner tube 8', because at this time the port 27 is in registry with the inlet passageway 22 and the port 28 is in registry with the Bunsen burner passageway 26 while the passageway 24: is blocked off by a solid portion of the valve. In either of these latter positions the flow to the burner tube can be regulated by slight shiftingof the operating handle 19. The solid portion of valve between the ports 21 and 27 can be revolved across the inlet passageway 22 for shutting oil the flow of gas to either burner tube.

For eliminating the wax impression in a casting case, the case which is designated 3]. in Fig. 1, is set upright in the center of a circular screen 32 which is placed upon the supporting ring 13; As is well known to those skilled in the profession, the case 31 contains a wax impression imbedded in a plaster filling which is packed into the case 31 in a wet, plasticcondition. The object of heating the casting case is to dry and harden the plastic filling and also carbonize or boil out the wax impression. The multiplicity ot' flame jets playing around the sides of the case 31 impart an evenly distributed heat to the case 31 and result in a gradual uniform drying of all parts of the plastic filling. lVhen the boiling out technique is to be employed, the casting case is set upon the screen 32 with the sprue hole extending from the wax impression pointed downwardly, so that as the wax liquefies, it can flow down; through the sprue hole and drop through the screen 32. hen the carbonizing technique is employed the case 31 is reversed so that the sprue hole points upwardly. In this process, the wax-f is eliminated by vaporizing it entirely out of the plaster filling through the sprue hole. In either of the foregoing methods, when an investment or plaster filling is subjected to an unevenly distributed heat, the same is caused to disintegrate its particles unevenly, resulting in a poor casting, whereas, if subjected or exposed to a heat'which will permeate evenly all portions of the investment at the same time, a truer matrix results, which makes possible a sharper or more accurate casting. The present arrangement of a multiplicity of small but powerful jets of flame directed upon all sides of the investmentsimultaneously, secures a uniform distribution of steady and conveniently adjustable heat throughout the interior or the investment, permeating every particle thereof and making possible atrue homogeneous cast.

iVhen it is desired to heat cases "for soldering,- the supporting ring 13 is raised upwardly through. the burner ring 8 to a plane above the burner ring, and the case is then set upon the wire screen 32 resting upon this supporting ring. Such adjustment of the burner is illustrated in Fig. 2. This elevated position of the supporting ring 13 also afi ords a convenient rest for a pan, sterilizing receptacle or other vessel for containing water or other liquid to be heated. This is always of advantage in a laboratory. By raising or lowering the supporting ring13 the pan or other receptacle can be brought directly into the center of the several jets of flame, or can be raised to any desired height above the jets. The supporting ring 13 can be swung out of the way entirely by lowering it through the burner ring 8- and swinging it to the left around the tubular standard 8. \Vhere a more intense concentrated heat is desirable the Bunsen burner tube 15 comes into :play; The wire screen 32 is shown as being readily removable from the supporting ring- 13 but, if desired, it can have its edges crimped over the supporting ring.

As shown in Fig. 4, I also contemplate constructing the burner with a plurality oi superposed burner rings 8. This is of advantage when large casting cases holding a full upper or lower impression are to be heated. 'The two or three burner rings evenly distribute the heat along the greater lit) llll) rounding the article, said burner ring having a plurality of orifices discharging radially in the direction of the plane of the ring, the flames from said orifices striking that part of the. article lying in the plane of the ring irrespective of the dimension of the article in the direction of said plane,

2. In a device of the class described the combination of a support for an article to be heated, an openlmrner ring surrounding the article and provided with a plurality of orifices for discharging flames radially upon the article, and an adjustable mounting for said support, said adjustable mounting permitting ad ustment ot the support in a direction substantially normal the plane of the burner ring to adjust different partsof the article into position to receive said flames. v

3. In a" device of the class describedthe combination of a support for an article to be heated, said support being adjustable, means for securing same'ln ad usted position, and a burner ring surrounding the article in its different adjusted positions and provided with a plurality of orifices for discharging substantially radially upon the article. J

4. In a burner of theclassdescribed, the combination of an annular burner element having a plurality of burner jets around its inner circumference, and an adjustable sup port movable up and down through the opening defined by said annular burner ele ment. i

5. In a burner of the class described, the combination of a: substantially upright standard, a circular burner element at the upper end of said standard, said burner element having a plurality of jets around its inner circumterencc, a support for the article to be heated, said support being adjust-' position.

adjustable through said loop, and means for clamping said supporting ring in adjusted position. i

7. In a dental burner, the combination of a base, a tubular standard rising from said base, means permitting gas into said tubular standard, an annular burner ring connected to said tubular standard and receiving the gas therefrom, said burner ring having a plurality of burner jets around its inner circumference, a clamping member shiftable along said tubular standard, and a supporting member carried by said clamping memher and movable above and below the plane of said burner ring.

8. In a burner of the class described, the combination of a burner tube, means for admittinggas tothe lower part of said tube, the upper part of said tube being bent into a substantially circular loop, a plurality of radial jets around the inner circumference of said loop, a supporting ring movable through said burner loop, and means for adjustably clamping said supporting ring to said burner tube.

9. In a dental burner, the combination of a base, socket means, a burner tube mounted in said socket means and extendlng up wardly from said base, the upper end of said tube being bent into a substantially horizontal ring, means for admitting gas to the lower end of said tube, a plurality of burner jets in said burner ring arranged to discharge radial jets of flame, a supporting ringmovable up and down through said burner ring, and a clamping block carry-- ing said supporting ring and adapted to be adjustably clamped alongthe upright portion of said burner tube.

10. In a device of the class described, the combination of a mounting base, a ring burner fixedly supported thereon, a Bunsen burner fixedly supported thereon, and a single distributing valve for controlling the supply of gas to said burners.

1 1. In a dental burner, the combination of a mounting base, a ring type of burner fixedly supported on said mounting base, a straight type of burner fixedly mounted 011 said base, and a common valve for selectively controlling the operation of each of said burners.

12. In a dental burner, the combination of a mounting base, a first burner tube sup ported on said base, a burner ring having radial burner jets supported by said first burner tube, an adjustable support movable above and below said burner ring, a sec- 0nd burner tube, and a common valve operable to selectively admit gas toj ei'ther or both of said burner tubes, and to control the flow to either or both of said tubes.

13. In a dental burneiythe combination of a mounting member, a first burner tube fixedly carrled OllSllld mounting member, a

ringburner having substantially radial burner jets carried by said first burner tube, a second burner tube, fixedly mounted on said base, a valve housing, a supply passageway entering said valve housing, passageways leading from said valve housing to each of said burner tubes, and a rotatable valve element in said housing having a plurality of ports therein operable to selectively admit to either of saidbul'ncr tubes and to control the amount so admitted.

14. In a device of the class-described, the combination of a plurality of superposed burner rings, each of said rings having a plurality of burner jets around its inner circumference, a support for the article to be heated, and means for relatively adjustin}; said support and said burner rings.

In Witness whereof, I hereunto subscribe my name this 13th day of February, 1923.

ERNEST E. DALTON.

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