US1245030A - Furnace-shield. - Google Patents

Description

w. s. Roc'kwELL.

FURNACE SHIELD.

APPLICATION FILED .IUNE IB. I9I7.

Patented oct. 30,1917.

2 SHEETS-SHEET I.

w. s. RocKwELL.

FURNACE SHIELD. APPLICATION FILED IUIIE I8. ISII.

Patented Oct. 30, 1917.

2 SHEETS-SHEETv 2.

STATES WLTEB S. vROGKITIEEIIII., 0F NEW YORK, N. Y., ASSIGNOB TO W. S. ROCKWELL COMPANY,

OF NEW YORK, N. Y.,

.A CORPORATION OF NEW JERSEY.

. FUBNACE-SEIELD.

Application led June 18, 1917. Serial No. 175,318.

To all whom t may concern.'

Be it known that I, WALTER S. Rooi'iwnnr., a citizen of the United States residingv at 300 West 106 street, New York, county .of New York, State of New Yor have 1nvented certain new andd useful Improvements in Furnace-Shields, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to a means of protecting the operator of a furnace from the hot flaming gases which escape from the doorway or working-opening and is a modliication of that shown in my Reiue Patent No. 13,713 dated April 14, 1914.

The operator is often much exposed to the heat of the gases when manipulating the bars or other stock inserted in the doorway for heating, and many furnaces areunprovided with any door for the working-openm n such furnaces the doorway forms an outlet for thecontinuous discharge of the hot gases, which thus cause inconvenience and suffering to the operator when standing before the doorway.

This invention is designed to protect the operator from such heat by means of a hood forming an upright flue upon the furnacefront over the doorway through which iue the heated gases may be directed positively upward instead of blowing outward upon the operator.

In the hood of the Reissue Patent No. 13,713, the iue is traversed by air-pipes in which air was heated, and such hot air delivered to the combustion-chamber of the furnace to promote combustion; but the cases Vis gases by a refractory lining to the shield, and an extension of the brick-work through the furnace-front into the sides or casing of the hood. In this invention a sill is projected from the doorway beneath the mouth of the hood, and the outerV side of the hood is formed of an adjustable shield which may be raised and lowered at pleasure, and can thus be lowered to direct the hot gases wholly into the hood.

The adjustable shield 1n the present 1nside elevation vention furnishes the sole means of restricting or preventing the discharge of hot gases toward the operator as the doorway itself isprovided with no oor but opens into the bottom ofthe hood so that it is in constant communication with the draft-flue in the hood.

Such disposal of the gases wholly protects the operator from the heat whether he is or is not manipulating the bars or other articles placed in the heating-chamber.

To increase the upward draft within the hood, a blast-pipe may be inserted within the mouth of the hoodv and a blast of air projected to propel the hot gases into the hood.

jector, to drawthe gases-by suction from the doorway, and in great part prevent their discharge toward the operator when he is manipulating articles within the furnace; or the blast may be directed obliquely downward toward the sill and doorway, as in the said. reissue patent, thus intercepting the outward current of the hotgases and compelling them to escape through the hood.

In these various embodiments of the invention, the sill adds 4materially to the effectiveness of the device as it 'prevents any upward rush of cold air into thehood.

Such a hood stands upon the furnacefront above the working-opening, and to prevent radiation of heat from such hood -toward the operator its outer side is formed as a shieldlformed vof or lined with refractory material, and the opposite sides of the hood are lined with brick which may be made continuouswith the brick-work of the furnace-body, Such a hood thus operates to prevent the hot .gases from annoying the operator and prevents their heat, when drawn into the hood, from radiating out ward in any direction. The shield is preferably adjustable on the hood.

This forin of apparatus is illustrated in the annexed drawing, in which Figure 1 is a of a furnacevprovided with the apparatus; Fig. 2 is a longitudinal section of the same; Fig. 3 is a horizontal section' of the forward end of the furnace taken on line3-3 in Fig. 4; and Fig. 4 is a vertical section taken on line 4-4 in Fig. 3; Fig. 5 is a front elevation of the furnace;

Patented Oct. 30, 1917.

rsi

having` the casing for the hood integral therewith; Fig. 7 is a front elevation ci the ilirnace-body with the hood in section on 3 line 7 5( in Fig. 3; and Fig. 8 is a front view of the detachable shield of the hood. Fig. 9 shows an alternative arrangement oi the blast-pipe. Y

A designates the furnace-body formed of bricleworlr with a heating-cherchera therein, from the iront end of Vwhich chamber the -working-opening or doorway b is extended to introduce the stoclr to be heated. Such opening is termed the doorway `for `oonvenience herein. i

. Fluid fuel-burners B are shown in Figs. 1

and for heating the chamber a, and airpipes C and gas-pipes D are shown connected with the burners. lt is immaterial how the chamber is heated.

rl`he brick-work body is provided with a furnace {rollt-platea2 attached to the brickront c of the bod and havin a sill d at the floor-level of t e doorway. plate is shown in the drawing with cheeks e projected therefrom to form the casing of thev hood, and provided, as shown in Fig. 3, with flanges f upon theirouter edges, upon which a shield g is mounted movabl to form the outer side of the hood, and-adapted when lowered to cut o the blast of hot gases when the doorway is not in use.

The inner side at least of the shield is formed of. refractory material h, and the cheeks e ot the cas l; are lined with re ractory material `sich is preferably formed, as shown in Figs. 3 and 7by extensions e of thebrick-ront c'. Such extensions of the brick-work require an aperture in the front-plate o, such aperture embracin all the space at the inner side of the hoo, so that the rear of the due and both edges are formed ofthe solid briclr-worlr and no part of the metaldront or casing is exposed to the direct heat of the bu gases. The cheeks and their refractory lmin are extended downward to the sill thus orming a chamber, before the doorway, wholly closed except an outlet below the bottom of the shield when the same is raised. 'lhe hood is thus formed with an upright channel open at the top, with; an .inlet or mouth at the upper edge of the doorway b. ,The outer edges of the anges f of the cas-Y ing are sloped inwardlyv toward the to and the shield is correspondingly incline which4 makes the upward draft more edective, and the shield 4is hung upon the end of a lever n, as shown in Fig. 5, which lever is @o ulcrumed upon the casing by a stud o. rlhe v lever has a weight p to. balance the weight of the shield, and a handle g to raise and lower the shield at leasure.

rlhe inclination o the anges f causes the' 65 shield, by its weight, to lie close to the lange,

he frontndose and the shield may be lowered more or less to limit the openin above the sill which ives access to the oorway, or by contact with'the sill, as shown in Fig. 6, to wholly cut oil' any horizontal direct escape oi the 70 hot gases and confine their escape entirely to n the hood.

Such use of the shield adapts the hood, without any blast, to ldispose of all hot gases and wholly prevent their escape toward the operator.

With the addition of the blast, the hood may be enabled when the shield is raised for access to the doorway, to prevent the escape of the hot gases toward the operator and direct them chiedy into the hood. The construction' thus protects -the operator from heat, whether he is operating through the open doorway, or the hood be closed as shown in Fig. 6. 85

A blast-pipe j is shown located near the mouth ofthe hood and extended across the saineparallel with the top o the channel c'. ln Fig. 2, the blast-pipe is shown close to the bottom edge of the shield, and having a longitudinal openingk in its upper side disposed to discharge a blast upwardly into the channel c' at such an angle as to lill the channel and drive ,all of its contents upwardly. rlhis produces a partial vacuum in the lower part of the hood which forcibly Y draws upwardly, as indicated by the arrow Z in Fig. 2, the gases escaping from the doorway ln Fig. 2, the sill d is shown extended 10o from the front c into line with the outer edge of the hood thus cuttin od an direct upward draft oi air into t e ho which would diminish the draft upon the hot gases. l

The space between the under side of the 10e blast-pipe j and the sill permits the workman to reach the worMng-o 'ening b to manipulate the stock placed in the'furnace'- chamber.

In Fi d, the blast-pipe j is shown disposed midway between the bottom edge of the shield and the furnace front-plate, and is shown in Figsj and d with two rows of blast-holes lc which discharge the blast upwardly in such directionsas to fill the hood and produce the upward draft desired. l ln Figli, the blastipeis shown arranged to direct the blast o hquely downward toward the sill and doorway, and thus intercept the these arrangements of the blast-pipe impel the gases upward into the hood. The cheeks which form the casing of the hood are shown in the drawing made integral with the furnace front-plate c, and are extended down- 125 ward to the sill d and formed each with an aperture m for the insertion of the blastpipe. The heat of the gases escaping from the doorway b is so great as' to require a most refractory lining in the hood to pro- 13o outward current of hot gases. All

tect its metallic casing, and the construction shown in Fig. 3 furnishes a brick-work structure on every side of the channel excepting the side which is closed by the shield, which has at least a refractory lining.

Such lining may be made of asbestos or magnesia, or similar materials adapted to protect the shield from injury by the heat, and especially to prevent the conduction of heat outward, thus protecting the operator from the radiation of heat. The whole shield may be made of refractorymaterial. The front brick-work c shown in |Fig. 3 requires repairs from time to time, owing to the excessive heat to which the arch over the doorway is exposed on its inner and outer sides.

It will be obvious from inspection of Figs.

2 and 1, that the shield g may be readily removed by disconnecting it from the lever, or disconnecting the lever from its fulcrum 0, thus permitting free access to the front brick-work when it is necessary to repair the same.

If the hood be made open at the top, as shown in Fig. 4, the gases are discharged above the head of the operator and are carried away by their own levity; but it is immaterial how the gases are conducted from the hood.

The construction of hood shown in the drawing is of the most practical and effective character and when combined with an adjustable shield and the sill d below. the mouth of the hood, the draft upwardly in the hood operates most effectively to prevent the projection of the hot gases toward the operator.

Having thus set forth the nature of the invention what is claimed herein is:

1. The combination, with a furnace having a doorway continuously discharging heated gases, of a furnace-front applied to the doorway and having a sill below the doorway and a hood sustained upon the front over the sill and closed at the sides and open at the top to form a draft-flue in constant connection with the doorway, such hood having its outer side formed of a shield adjustable to and from the sill for restricting the outward iiow of the gases or, when desired, directing them wholly upward into the flue.

2. The combination, with a furnace having a doorway continuously 'discharging heated gases, of a furnace-front applied to the doorway and having a sill below the doorway, a hood sustained upon the front over the Isill and having a casing inclosing the sides, with the brick-work of the furnace extended within the said sides to protect the casing from the hot gases, and the hood having upon its outer side a shield adjustable to and from the sill, and provided with a reflractory lining to reduce the radiation of eat. y

3.The combination, with a furnace having a doorway continuously discharging heated gases, of a furnace-front applied to the doorway and having a sill on a level with its Hoor, a hood. sustained upon the front over the sill and its sides lined with refractory material, a shield supported adjustably upon the front and lined with refractory material and movable to and from the sill to prevent the forward discharge of gases, when desired, and a blast-pipe sustained at the mouth of the hood, and operating with the hood as'an injector to draw the hot gases from the open doorway into the said hood.

4. The combination, with a furnace having a doorway continuously discharging heated gases, of an iron furnace-front applied to the doorway and having a sill at the bottom of the doorway, a hood open at the top sustained above the said sill, the iron furnace-front having an aperture at the inner side of the hood, and the inner wall of the'hood being the front brick-work of the furnace, and the sides of the hood formed of outward extensions from such brick-work, and the outer wall of the hood formed of a shield lined with refractory material, whereby the furnace-front and the casing of the hood are wholly protected from the heat of the gases passing through the hood.

In testimony whereof I have hereunto set my hand. A

WALTER S. ROCKWELL.

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