US1810683A - Furnace for heating drill steels - Google Patents

Description

June 16, 1931. B. R. SHEETS FURNACE FOR HEATING DRILL STEELS File d Dec. 1928 5 Sheets-Sheet l June 16, 1931.

B. R. SHEETS FURNACE FOR HEATING DRILL STEELS Filed Dec. 1928 5 Sheets-Sheet 2 r ll June 1931- B. R. SHEETS FURNACE FOR HEATING DRILL STEELS Filed Dec. 1928 5 Sheets-Sheet 3 6110: we L4 June 16, 1931. B. R. SHEETS FURNACE FOR HEAT-ING DRILL STEELS Filed Dec. 31, 1928 5 $heets*Sheet 4 amt June 16, 1931. B. R. SHEETS FURNACE FOR HEATING DRILL STEELS Filed Dec. 51, 1.928

5 Sheets-Sheet 5 Patented June 16, 1931 STATES "PATENT orr es BARTON n. smears, or nENvER, ooLoR'Ano. ASSIGNOR To GARDNER-DENVER COMPANY,

or nnrivnn, oonoaeno, A oonroaerron'or 'DELAVTARE summons-on HEATING DRILL STEELS Application'filedDecember 31, 1928.' Serial No. 329,589.

The present invention relates morepan' ticularly to forges or furnaces for heating drill steels and other implements and articles. One'of the objects is to provide a compact structure in which the various parts are accessible and readily changeable.

'Another' and important object is to provide means whereby, the workman is protected from the heat and sparks or products of combustion. Still another and important object is to provide a structure which is relatively noiseless in operation. a

The preferred embodiment of the invention is illustrated; in the accompanying drawings, wherein:

Figure 1 is a front elevation of the furnace structure.

Figure 2 is an end elevationof the same. Figure 3 is a-vertical cross sectional view taken on the line3-3 of Figure 1 and on a smaller scale to illustrate the supporting pedestal.

Figure 4 is a plan View of the furnace body with the upper structure removed.

Figure 5 is a top plan view of the front Wall plate of the furnace body.

Figure 6 is aside elevation of the same. Figure 7 is a plan View of the bottom plate.

sists of a metal box comprising a bottom plate l5provided with suitable depending reinforcing flanges 16, and bolted as shown.

at 17 to the pedestal. A frontplate 18 and a rear'plate 19 are bolted, as shown at 20 to the, margins of the bottom plate. End

Figure 8 is a side elevation of the same,

plates 21 are likewise bolted to the ends .of the bottom plate 15 and are bolted, as shown at 22, to the front and rear wall plates 18 and 19. Within this metal box or casing is located a lining, preferably consisting of ordinary standard fire brick 23, forming a combustion chamber 24;. The top bricks 25 of the lining extend overthis chamber and are suitably formed to produce an outlet throat 26 opening through the top of the furnace body. The top face of said body constitutes in effect a platform 27 Resting upon this platform 27 is a heating chamber member. This member consists of two metal end walls 28 that looselyrest on the platform and have interposed. between them a row of fire brick 29, elevated to provide the heating chamber 30. The end walls 28 are connected by three tie bolts 31 and 32, all of said tie bolts being located above the firebrickand the tie bolts 31 being located'at a lower plane than the tie bolt 32. These tie bolts serve to secure the parts together with suflicient pressure to hold the bricks 29 in place, as clearly shown in Figures 3 and 10. The end walls 28 have on' their inner sides inwardly extending flanges 33 which serve as guides or positioning devices for the end bricks 29. The chamber 30 is thus left open both at its front and rear sides and is located over and in communication with the outletthroat 26 of the combustion chamber 24. 1

Secured to the end plates .21 of the furnace bo'dycasing are standards 34 that are located beyond the ends of the i heating chamber member. flhesesta'ndards terminate at their upper ends in'yokes 35. Lo cated in said yokes are the ends of a pipe 36 that extends through the upper end of a shield 37. This shield is in'the form of a,

flat. sided rectangular thin box, intothe lowercorners of which are fitted nipples 88.

To one of said nipples is connected a fluid supply pipe .39 having a controlling valve 40 therein; ,Therother nipple is:closed by a cap 41. It will be evident that-the supply pipe canbe" connected to either nipple as convenience {may dictate. The upper pipe 36 is provided within the upper portion of the shield 37 with a plurality of lateral inlet openings 42 (see Fig. l) and one end of said pipe is open as indicated at 43 so that a discharge pipe leading to any suitable point, may be connected thereto.

The front wall of the combustion chamber 24 is provided with the usual burner opening 44, and a burner 45 of any suitable construction is located at the front end thereof. This burner in the present structure is an oil burner, and is supplied by a pipe 46 leading from any suitable reservoir, and controlled by a valve 47. Air is also supplied to the burner, and this air is preheated. For this purpose a relatively large pipe or preheater tube 48 is mounted in the standards 34 above the heating chamber member and behind the upper portion of the shield 37. In other words, this preheater tube 48 is interposed between these two parts. Connected to one end of the tube 48 is a pipe 49, by which air under pressure from any suitable source is supplied to the tube. The pipe 49 is shown as leading from a T-coupling 50, to one end of which a suitable air conduit can be connected. Air through the pipe 49 is controlled by a suitable valve 51, preferably located at the juncture of said pipe 49 with the tube 48 (see Fig. 1). From the opposite end of the tube 48 to that-having the valve 51, a downwardly and forwardly inclined tube 52, preferably of substantially the same diameter as the tube 48, leads to a position in front of the furnace body and here it is reduced or connected by a small pipe 53 with the burner 45.

Extending from the T-coupling 50 is a branch pipe 54 having a portion 55 lying in a groove 56 formed in the front top corner of the furnace body. This pipe is provided with a plurality of upwardly faced outlet ports 57 and these serve to produce an upward current of air across the space between the lower end of the shield 37 and the deck or platform of the furnace body.

The front and rear side walls 18 and 19 of the furnace body casing are provided with outstanding cars 58 and the lower portions of the standards 34 have ears 59 alined therewith. Through these ears slidably pass the side rods or bars 60 of a tool supporting frame. The side bars are connected at their front ends by a cross handle bar 61 and behind the handle bar is an upset horizontally disposed supporting or carrier bar-62 that is thus arranged in front of the furnace body and substantially at the height of the platform or deck 27.

With this construction, it will b evident that the heated products of combustion generated by the burner will rise through the throat 26 and enter the heating chamber 30. Consequently drill steels or other tools or articles placed on the deck 27 and sup ported by the bar 62 with their inner ends in the chamber 30 will be heated. The shield 37 serves to prevent the radiation of heat in front of the forge and also directs the heat escaping from the front side of the chamber 30 to the air heater 48. As a further protection to the operator the upwardly moving curtain of air from the pipe 54 serves not only to carry the heat upwardly but prevents sparks, flame and the like escaping forwardly under the shield. This upwardly moving current of air serves to deflect the heated products of combustion and assists in causing them to pass the preheater. Because of the size of the tube the air passing therethrough to the burner moves sluggishly so that it is heated before it reaches the burner and this slow movement coupled with the structure and arrange ment shown has proven to greatly reduce the noise of operation that is the normal accompaniment of a burner of the type. The support obviously is adjustable to suit the length of the articles being heated and can be moved rearwardly so that it is practically out of the way when not wanted.

From the foregoing it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. In a furnace of the character set forth, the combination with a furnace body having a combustion chamber, and a heating chamber surmounting the same and having an open front side, of a shield supported in advance of and above the heating chamber and having its lower end spaced from the body to give access to the open side of the heating chamber, a burner for the combustion chamber, means for supplying fuel to the burner, and a tubular air heater interposed between the upper portion. of the shield and the top of the heating chamber and located over said top of the latter.

2. In a furnace of the character set forth, the combination with a furnace body having a combustion chamber, and a heating chamber surmounting the same and having an open front side, of a shield supported in advance of and above the heating chamber and having its lower end spaced from the body to give access to the open side of the heating chamber, a burner for the combustion chamber, means for supplying fuel to the burner, a tubular air heater interposed between the upper portion of the shield and the top of the heating chamber and located over said top of the latter, and means for creating an upward flow of airacross the space between the furnace body-and shield,

said shield directing such flow to the air I heater.

3; In a furnace of the character set forth, the combinatlon w1tha furnace body having a combustion chamber, and a heating chamber surmounting-thesame and having an from the furnace body in front of the open side of the heating chamber, a burner for the combustion chamber, means for supplying fuel to the burner, and means for supplying air to the said burner, including a tubular air preheater supported by the stand ards above the heating chamber and interposed between the portions of the heating chamber and shield.

4. In a furnace of the character set forth,

the combination with a furnace body having a combustion chamber, and a heating chamber surmounting the same and having an open front side, of standards at the ends of theheating chamber, a forwardly and downwardly inclined shield hung from-thestandards and spaced from the furnace body in front of the open side of theheating chamber, a burner for the combustion chamber, means for supplying fuel to the burner, means for supplying air to said burner, including a tubular air preheater supported by the standards and interposed between the upper portions of the heating chamber and shield, and a pipe located on the furnace body and delivering upward jets of air across the. space between the body and shield and toward the preheater.

5. In a furnace of the character set forth, the combination with a furnace body having a combustion chamber provided with an outlet throat opening through the top of the body, of a heating chamber member comprising relatively movable-end walls that removably rest on the top of the furnacebody,means connecting the end walls for moving them towards each other, and a top wall of fireresisting material clamped between the end walls and spaced from the top of thefurnace body above the throat leaving open sides.

6. In a furnace of the character set forth, the combination with a furnace body having a combustion chamber provided with an outlet throat opening through thetop of the body, of a heating chamber member comprising end walls that are adjustable toward each other and removably rest on the top of the furnace body, a top wall of fire brick interposed between the end walls and spaced from the top of the furnace body above the throatleaving open sides,;and tie bolts con.-

necting the end walls and thereby clamping the fire brickin place between them.

7. In a furnace of the character set forth, the combination with a furnace body having a combustion chamber provided with an outlet throat opening through the top of the, body, of a heating chamber member comprising end walls that removably rest on the top of the furnace body, a top wall of'fire brick interposed between the end walls and spaced from the top of the furnace body above the throat leaving open sides, tie bolts clamping the end walls together and securing the fire brick in place, standards mounted on'the furnace body at the ends of the heating chamber, and a shield supported by the standards and extending downwardly in advance of said member and in spaced relation to the furnace body.

8. In a furnaceof the character set forth, the combination with a furnace body having a combustion chamber providedwith an outlet throat opening through the top of the body, of a heating'chamber member comprising end w'alls that removably rest on the top of the furnace body, a top wall of fire brick interposed betweenthe end walls and spaced from the top of the furnace body above the throat leaving open sides, tie bolts clamping the end walls together and securing the fire brick in place, standards mounted on the furnace body at'the ends of the heating chamber member, a shield supported by the standards and extending downwardly in advance of said member and in spaced relation to the furnace body, a burn er for the combustion chamber, and air supply means for the burner including a preheater interposed between the heating chamber member and the shield.

9. In a furnace of the character set forth, the combination with a furnacebody having a combustion chamber, and a heating cham-' ber surmounting the body and in communication with the combustion chamber, said heating chamber having an open front side, of ears on the ends of the furnace body, supporting bars slidable in the ears and extending in advance of the furnace body, a handle bar connecting the front ends of the supporting bars,"and an article carrier bar connecting the supporting bars in rear of-the handle bar and supporting the front i ends of the articlesentered'in the open front sideof the heating" chamber.

10. In afurnace of the character set forth, the combination with supporting means, of a furnace'body mounted on the supporting means and havinga combustion chamber that opens throughth'e top of the body, a heating chamber. member on the top of the body, the heating chamber of said body being in communication with the open top of the combustion chamber and having an open front, standards rising from the body at the ends of the open front ofthe combustion chamber, a shield mounted on the standards and located in front of the combustion chamber member with its lower edge above the body and giving access to the front opening, a burner for the combustion chamber, means for supplying fuel to the burner, and means for supplying air to the burner, including a tubular air preheater extending behind the shield and along the front upper portion of the heating chamber member, means for supplying air to one end of the preheater at one end of the body, and a pipe leading from the other end of the preheater at the other end of the body and extending to the burner.

11. In a furnace of the character set forth, the combination with supporting means, of a furnace body mounted on the supporting means and having a combustion chamber that opens through the top of the body, a heating chamber member on the top of the body, the heating chamber of said body being in communication with the open top of the combustion chamber and having an open front, standards rising from the body at the ends of the open front of the combustion chamber, a shield mounted on the standards and located in front of the combustion chamber member with its lower edge above the body and giving access to the front opening, a burner for the combustion chamber, means for supplying fuel to the burner, and means for supplying air to the burner including a tubular air preheater extending behind the shield and along the front upper portion of the heating chamber member, an air supply pipe of less diameter than the preheater extending upwardly along one end of the body and connected to one end of the preheater a pipe of substantially the same diameter as the preheater connected to its other end and having a down-turned portion at the other end of the body, and a pipe of less diameter than the preheater connecting the last said pipe with the burner.

12. In a furnace of the character set forth, the combination with a body having a combustion chamber that opens through the top of the body, a brick Work supported over the body and over the open top of the combustion chamber in spaced relation to both, forming a heating chamber that is open both at the front and rear, the front end terminating short of the front end of the body, forming a platform, a shield supported above the front portion of the body with its lower edge in spaced relation thereto and in advance of the brick work, giving access to the open front of the heating chamber, a burner for the combustion chamber, and an air supply conduit for the burner extending across and above the front portion of the body and behind the shield along the upper front portion of the brickwork and having a downturned portion that extends to the burner.

13. In a furnace of the character set forth, the combination with a body having a combustion chamber that opens through the top of the body, a brickwork supported over the body and over the open top of the combustion chamber in spaced relation to both, forming a heating chamber that is open both at the front and rear, the front end terminating short of the front end of the body, forming a platform, a shield su ported above the front portion of the body with its lower edge. in spaced relation thereto and in advance of the brickwork, giving access to the open front of the heating chamher, a burner for the combustion chamber, and an air supply conduit for the burner comprising a branched supply pipe, one of the branches being perforated and extending along the platform at the bottom of and in advance of the front opening of the heating chamber, the other branch extending upwardly at one end of the body and the brickwork, a substantially straight air preheating tube to which the upwardly extending branch is connected, said tube extending along the front upper portion of the brickwork behind the shield and above the said front opening, and a downwardly extending air conveyor pipe of substantially the ame diameter as the tube connected to the other end of said tube and having a reduced connection with the burner.

In testimony whereof, I afiiX my signature.

BARTON R. SHEETS.

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