US2432047A - Heat screen - Google Patents

Description

'Dec. 2, 1947. H, D STERlCK ETAL 2,432,047

' HEATSCREEN Filed Sept. 8, 1945 3 Sheets-Sheet 1 rrvmsrs Dec. 2, 1947. H. D. sTERlcK ETAL 2,432,047

HEAT S CREEN Filed Sept. 8, 1943 3 sheetsi-Sheet 2 lNvEN-roRs Harrison 27. Stendc Leslie QStriL-Jd and 57 mvwaw HTTORNEYS Dec. 2, 1947. H. D. s'rERlcK ETAL 2,432,047

HEAT SCREEN v Filed Sept. '8. 1945 3 Sheets-Sheet 3 jig-7248 I .5s

FF .15. lg. 51

l INVENTOR S Hazrsbn l? St erick .Leslie GSITiCkZand,

HTTDRA/Eys Patented Dec. 2, 1947 UNITED STATES PATENT OFFICE HEAT SCREEN Harrison D. Sterick and Leslie C. Strickland, Pittsburgh, Pa.

Application September 8, 1943, Serial No. 501,554 16 Claims. (Cl. 160-179) Our invention relates to heat screens, and particularly to heat screens that do not greatly interfere with vision therethrough.

Heretofore heat screens have been made of various elements, such as chains and cables. While such screens are somewhat effective, they are heavy, do not greatly aiect the flow of heat therethrough and when they get heated up their `eiliciency as a heat screen greatly declines. Moreover they are usually heavy and fairly expensive and are not suited to be freely moved from place to place.

The screens made according to our invention are light, inexpensive and cause the heat to be deflected so that the operator or object is protected, and furthermore the screen is of such character that observation of an operation or process therethrough is not materially affected.

In accordance with our` invention the preferred screen has as its principal element one that has a plurality of closely spaced transverse slits that form a row of very narrow ribbon-like ns or prickles. The slits extend only part way across the strip so that the ns are integrally connected to the strip by a portion which extends therealong. The iins conduct heat from the unslit portion and provide a much larger area of radiating surface than does an uncut strip. We also contemplate the use of perforated sheets and also expanded metal as screen elements.

The elements are made use of in various forms of screens which are such as to cause the heat to be deflected along the screen and this action deflects much of the heat from a person or thing to be protected.

In the drawings, which represent the present preferred embodiments of our invention,

Fig. 1 is a plan view of one form of our screen clement;

Fig. 2 is a view in perspective of one shape of the louvers in said element;

Fig. 2a is a view in perspective of another shape of the louvers;

Fig. 2b is a View in perspective of still another shape of the louvers;

Fig. 3 is a plan view of another form of our screen element;

Fig. 4 is a view in elevation of a heat screen embodying the screen element shown in Fig. 1;

Fig. 5 is an end view of the heat screen shown in Fig. 4;

Fig. 6 is a section View along the line VI-VI of Fig. 4;

Fig. 7 is a plan view of a heat screen in position around an ingot mold;

Fig. 8 is a section view along the line VIII-VIII of Fig. '7;

Fig. 9 is a plan view of a corner of the screen shown in Fig. 7 but to a larger scale;

Fig. l0 is a view in elevation of another form of heat screen, suitable for use on the top of an ingot mold;

Fig. 11 is a top plan view of the screen sho-Wn in Fig. 10;

Fig. 12 is a view of another form of heat screen, shown in place around an ingot mold;

Fig. 13 is a view in elevation of the screen shown in Fig. 12;

Fig. 14 is a view in elevation of another type of heat screen;

Fig. 15 is an end view of the screen shown in Fig. 14;

Fig. 16 is a top plan view of still another form of ingot screen;

Fig. 17 is a view in elevation of the screen shown in Fig. 16;

Fig. 18 is a plan view of another form of screen element;

Fig. 19 is a plan view of still another form of screen element; and

Fig. 20 is a plan view of still another form of screen element.

In Fig. 1 of the drawing we have shown a typical screen element I 0, consisting of a rectangular strip I I of metal such as steel or copper of any convenient length having rows of substantially parallel closely spaced cuts or slits I2 that extend inwardly from the opposite side edges of the strip at right angles to the strip edge and terminate at such points as to leave a solid strip or body portion I3, relatively narrow, which extends lengthwise of the strip along its center. The portions of the strip between the slits form a plurality of very narrow ribbon-like ns or louvers I4 which are connected at their inner ends to the body portion I3. The ns I4 may be made to assume various forms, for example, they may be rectangular; they may be crinkled longitudinally so as to have a concave portion I4a as shown in Fig. 2; they may have two concave portions I4b with a rib I4c in between as shown in Fig. 2a; or they may have an S cross-section Md as shown in Fig. 2b. Sections such as shown in Fig. 2, Fig. 2a and Fig. 2b tend to provide somewhat stiffer ns than at fins of rectangular section. A convenient size of strip is 8" wide, of V16 material having slits 1/8 of an inch apart and a central body portion about 3A" wide. It is to be observed that no metal is removed in slitting 3 the metal strip, but that the fins are forced out of the normal plane (see Fig. 9).

In Fig. 3, the fins l5 form an angle with the side edge of the strip. In this figure the body portion i6 has openings Il each with a projecting portion or lip I8. It is to be understood that such openings could also be formed in body portion I3 of the strip shown in Fig. 1. It is also apparent that the cross section of the fins I5 'can bejrecjtangular, or otherwise, as for example those shown in Figs. 2, 2a, and 2b.

In Fig. 4 we show a heat screen which may be usefully employed to screen an operator from va source of heat such as a furnace ladle or the open door of a heating furnace. Thescreen corm prises a frame I9, which is formed from ani inverted U-shaped piece of` pipe in the inner braced by the triangular plat-es 22. Slidably received in the groove 211; isa-screen 24 including vertical strips 25 of screen element, like the element 1 0 shown in Fig. 1. It is to be understood that the screen elements-can be alsofarranged horizontally or at an angle' tol the horizontal. The strips are secured, at the ends o fthe body portions i3 to an edge strip or sash 25 of metal which extend around thel four sides of the 'screen and is slidably received in the groove 20.1 Bolts 26 and 27 are threadedthroughtheframe I9 and support the loweredge of; theedge; strip` 25,'. The screen can be readilyl removedj orreplaced by withdrawal of the bolts 26 and 21,.; It isllalso within our contemplation to; make each screen element l0 detachable so that they-could be readily replaced incasegof injury to. the. element.

One of the important uses of the screen element IU- isin the construction of a mold screen 28 illustrated in Figs. 'l and 8. The-screen. consists of a frame-ZS-of such a; size esto enclose a mold 30 and leave a space of severalinchesysay 3, between the screen and the ingot mold sides. The frame which is slightly higher than. vthe mold. includes uprights 3l off angleriron or other suitable section, top braces 32, side;liraoesfg?.3 V and. bottom braces 34. all ofl ang-leironf or other convenient section, all secured together; as by weld;`

ing. Lifting eyes are, secured midway' of the sidesof the top brace32. The'sldes of the frame 29 are 'formed byy vertical strips-I 0r of' the screen;

elements, such as4 shown inFig. 1 or Fig. 2, preferably arranged. vertically. They couldbe honii zontal or at an angle to theyertical., The ends', of the 'nsadjoinor VslightlyV overlap; as shown, in Fig. 9. A screen of `this character canad;-V Vantageously be usedto surround an ingot moldA and causes the heat from, the hotV moldto flow-l upwardly along the spaces between the moldl wall and the screen. This heat -flow keeps the topl portion of the mold and its contents hot for a longer period, than where a screen is not,v used,4

thus reducingv piping and segregation. of thespaced. apart by spacers 42 through whichpasses 1 -subjected to the blast.

to be shielded from the heatof a furnace.

4 the bolts 43, which bolts pass through appropriate openings in the screen layers and through the bottom and top frames. Each corner of the bottom and top frames are joined by corner pieces 44, conveniently made from angle iron. A lifting eye 45 is fastened to the top frame. The dimensions of the top screen are such that the brace members 4I rest on the top of the ingot mold walls and the screen extends beyond each end wall.

In Figs. 12 and 13 there is shown an ingot mold screen 46 which. is hinged so as to be opened or closed to surround a space around an ingot mold 41 (shown in broken lines). The mold screen consists of two portions, each portion including a side screen 48 and an end screen 49. Each screen includes uprights 59 of angle iron, a top Ybrace 5! of strap iron, a center brace 52 of strapiron and a bottom brace 53 of strap iron. The sides and ends are covered With adjoining strips of screen element 54, like that shown in Fig. 1 ory 3. Each of the portions are hinged at 55, 56 and 51 and are secured by fasteners 58, 59 and 69 at the opposite corners. This form of mold screen is Wrapped around the ingotl mold, while the form shown in Figs. 8 and 9- are vdropped down over the ingot mold. The effect of each when in position is the same.

Inl Figs. 14 and 15, We have shown a screen which includes ay U-shaped frame 6| mounted ona'pedestal'BZ, a screen element 63 and a guard` element 64, each received in the frame, both elements preferably being slidably received. The screen 63, the rear one in Fig. 14, is made from strips of screen element such as shown in Fig. 1 or Fig. 3` joined-to a sash or anedging 65 which is .slida-bly received in the frame 6-I andsecured by bolts-66.` The other screen cr guard 64- is spaced from thel screen 63` and is made of expanded metal-'or Woven wire, secured to an edgingV 611- slidably received in frame 6| and secured by bolts 68; i This kind of screen screens` an` observer from. most of the heat from a source, suchv as a furnace-or pouring ladle beyond the sore-en. and protects the observer from flying particles of metal, and Vat the same time does not greatly interfere with the operators view of the heat source.

In Figs. 16 and 17, we have shown diagrammatically a mold screen 69 large enough to surround two ingots 10 and yH placed on a car "12. The screen includes a frame 13. similar to frame 28 (Figs. 7 and, 8) and the screen elements 14 are like theA screen elements in Fig. 1l -or Fig. 3. It is evident that a similar frame can be arranged so as to enclose any number of ingots. This screen, as Well` as. the ingot screens heretofore described, not. onlyl aid in a better solidication of an ingot, but also protect it from adverse atmospheric currents when standing or passing through an ingot yard which is usually open. Not infrequently a very cold blastv may be directed against one or more sides of theA cooling ingot and mold while the other sides are -not This, results in'Y uneven cooling and undesira'bly effects the solidifying ingot. The screen we have described greatly minimizes such effects.

limited.

Screens such as shown in Figs. 4 and jand;

Figs. 14 and 15 are useful Where operatorsl are In:

such instances, the screen may be large enough or enough screens provided to screen a desired part of the walls. The screens may rest on the ground or may be suspended from or hinged to the furnace or from any other convenient support.

In Fig. 18 we have shown another suitable screen element l5. The element 'I5 is made from a strip olf relatively thin metal and has narrow edge portions I6 and 1l, a top portion '18, a bottom end portion not shown, and a center portion 1B. The portions between the edges and center portion are slitted to form fins 80. The pins are offset from the plane of the strip.

In Fig. 19, we have shown a screen element 8i which is similar to the one shown in Fig. 18, but without the center portion.

In Fig. 2G, we have shown a screen E32 of pei'- forated metal having narrow cut out slots 83 spaced apart. When an element of this character or a screen of ordinary fine rneshed expanded metal is employed, the sheet `may be of any desired practical dimensions.

It is understood that in practice the screen fins do not lie in a flat plane, but each alternate one except where it joins the center portion or body portion is above or below the plane of the strip and forms a small angle therewith. Thus it is possible for light rays to travel through the element.

It is apparent that the hot top shown in Fig. ll can be protected, top and bottom, by expanded metal or metal mesh such as we have shown and described in Fig. 14. It is also apparent that the mesh protecting screen 64 can be placed on both sides of a screen similar to that shown in Fig. 14.

The strip elements l!! such as are used in the various screens, can be so attached to the frame in such manner that any element can be readily replaced.

It appears that the prlckled elements change radiant heat to conducted heat, and this may explain the eiciency of the screen in general and particularly where the screen element is incorporated in an ingot mold.

While We have described certain presently preferred embodiments of our invention, it is to be understood that the invention may be otherwise embodied within the scope of the following claims.

We claim:

1. A substantially planiform heat screen including a frame, and a screen element attached to said frame, said screen element including a body portion extending lengthwise thereof, and a plurality of closely spaced substantially parallel strips forming slits one end of each of said strips terminating at the body portion integrally therewith.

2. A heat screen including a frame, a plurality of substantially planiforrn screen elements attafhed to the frame, said screen elements each including a body portion extending lengthwise thereof. and a plurality of closely spaced substantially parallel strips forming slits one end of each of said strips terminating at the body portion.

3. A heat screen including a frame, a plurality of substantially planiform screen elements attached to the frame, said screen elements each including a body portion extending lengthwise thereof, and a plurality of closely spaced substantially parallel strips forming slits one end of each of said strips terminating at the body portion, the edges of adjoining screen elements being in contact.

4. A heat screen including a frame, and a iat 6- strip like screen element attached to said frame, said screen element-including a centrally disposed narrow body portion extending lengthwise thereof, and a plurality of closely spaced substantially parallel strips forming slits one end of each of said strips terminating at the narrow body portion.

5. A heat screen including a frame, and a flat strip-like screen element, said screen element including a central body portion extending lengthwisethereof, and a plurality of strips extending from the body portion to the edges of said element forming a series of fins, said ns being' inclined at an angle to the body portion and having intervening slits.

6. A heat screen including a frame, and a flat strip-like screen element, said screen element including a central body portion extending lengthwise thereof, and a plurality of strips extending from the body portion to the edges of said element forming a series of ns, the fins being crinkled longitudinally.

'l'. A heat screen comprising a frame having a slot therein, and 9, sash slidably received in the slot, screen elements attached to the sash, said elements each including a centrally disposed body portion, extending lengthwise thereof and a plurality of closely spaced substantially parallel strips forming slits one end of each of said strips terminating at the body portion, said screen elements being mounted in the sash with the edges of adjacent elements in contact.

8. A heat screen for enclosing a heated object said screen comprising a frame surrounding and spaced from the object said frame having screen elements attached thereto and said elements each including a narrow body portion of thin material, extending lengthwise thereof, and a plurality of narrow iins integrally attached to the body portion.

9, A heat screen for enclosing a heated object said screen comprising a frame having a plurality of sides, certain of said sides being hingedly secured to an adjacent side, and spaced from the sides of the object to be enclosed, said frame having screen elements attached thereto, said elements each including a narrow body portion of thin material extending lengthwise thereof, and a plurality of narrow ns integrally attached to the body portion.

10. A heat screen including a frame, and a screen element attached to said frame, said screen element including a centrally disposed body portion extending lengthwise thereof, a plurality of closely spaced substantially parallel strips forming slits one end of each of said strips terminating at the body portion, said body portion having spaced openings therein.

11. A heat screen including a frame, and a screen element attached to said frame, said screen element including a centrally disposed body portion extending lengthwise thereof, a, plurality of closely spaced substantially parallel strips forming slits one end of each of said strips terminating at the body portion, said body portion having spaced openings therein, and lips adjoining said openings.

12. A heat screen comprising a frame, a plurality of screen elements attached to the frame, and forming a substantially plane surface, said elements each including a body portion extending lengthwise thereof, a plurality of narrow fins attached to said body portion, and a guard element spaced apart from the screen element and sub- T stantiall-s'.i leil11a'1le1-v thereto@ both elements.: beine.;

slidably A reoevedf in l thearflalme.

13 A heat; screen. including; el plurel'ityY of: layers. e1 Screeoelementssde; bysida; each screen.

smeert apart; layer-sj.` each-- layer including screenA mexleogthwiseor the elementsrand aplurality4 element comprising a., narrow-body, portion-and-v Q1, ofl narrow ns, integrally attached: to` the.y body narrovtv elongated finsL integrally connected thereto, and a frame for holding said laybersirrl spaced apart. parallel relationship.

14 A, heat screen. including a., frame, screen elements, attached to the frame, said screen, ele mentsn includingv` a, centrally di-sposed--, body,4 portion,` a. plurality of, velfy` narrow ribbonflike ns attachedto said body portionfand extend-ing outwardly atleastsome-of sadfms, lying, Outside the normal plane of the body portion-l.

1,5. A-.heat screen, forenclosingj amingot mold, saidscreen oomprsin g aI frame surrounding. and spaced, from the sides ofthe mold, said frarnehaying, screen elementsattached thereto, saidr elements including, aoentrally .disposed body` nor--V tonof thin material extending. lengthwise of the element, and a plurality af-narrow, ribbon-like ns; extendingV from the-.body portion.

16., A. heat. screen` includingl a plurality. of

DQIQLL.,

HARRISOND. STERIGK., LESLIEEC. STRICKLANQ.

REEERENQES. (l-TED.'-

The following references arent recordfin the le of1 this patent:`

UNITED STATES PA'I'ENTS 1,52- Number Name Date 1,487,794 Melaun- Mar. 25', 1924` 936,183 Stein Oct. 5, 1909 2,162,562 Moore' June 13,1939 969,644- Matheson Sept. 6, 1910 Z9 600,904 Beall Mar. 22, 1898v 275,223 Langtry- Apr. 3, 1883 647,891 Stover Apr. 17, 1900 2,246,602 Schultz Juney 24, 1941

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