US1578927A - Arch brick - Google Patents

Description

March 30 1926.

.C. A. SIEGEL ARCH BRICK 1921 3 Sheets-Sheet l Filed Dec. 53.

. March 30 192G. v

C. A. SIEGEL ARCH BRICK Filed Dec. 31 1921 s Sheets-Sheet 2 March 30,1926.

' c. A. SIEGEL ARCH BRICK Filed Dec. 51, 1921 3 SheetS Sheet dig/ENTQR BY; I Z; i,

A TTORNEYF other sort- 'on the other brick. The convex face 25 is on a projecting nose'portion 27 at one side of the longitudinal center' line of the brick, while the concave face 26 is at the bottom (so to speak) of a 1'ecess -portion 28. As shown, each of the faces 25 and 26 is substantially symmetrical in reference to the thickness of the brick, and the cen-v ters of figure of these faces substantially coincidein the'midst of the brick -i. e., about in themiddle of its thickness. This latter,- feature allows the brick tobe made with a shorter and stouter nose 2? and a shallower recess 28 thanif the centers of figure of the faces 25 and 26 were a substantial distance to either side of the median plane of the brick. The conformation and relative arrangement of the correlatively correspond-i ing coinplementarily curved bearing faces 25 and 26 are such that in the arch unit they make multiple line or surface contact (as distinguished from mere single line contact), even in various reciprocally leaning angular relations of the cooperating bricks on various spans. This extended contact causes the bricks 22, 22 of an arch unit to stick together over a considerable width and area as a result of superficial fusion in service, so that if the arch is afterward temporarily taken down for any reason, these bricks will not break apart. As shown in Figs. 2 and 4 to" 7, the surfaces 25 and 26 are semicircular (or semicylindrical) and of the same curvature, and theirdiametcr is substantially equal to the thickness of the brick at its inner end.

The upper and lower corners 31 and 32 of each concave face- 26 are appropriately bevelled, reduced, or blunted,'to minimize breakage and fusion at these exceptionally weak and exposed points. At the upper end of the convex face 25, there is a shoulder 33 by which (so to speak) its circular contour is abridged or shortened. \Vhen the arch unit ison normal or subnormal. (short) spans, Figs. 4 and 5, the angular relation of the bricks 22, 22 is such that the shoulders 81 and 33 do not come in contact; but when the'unit. is on a supernormal (long) span of sufficiently great width, the shoulders 31. and engage or interlock as shown in Figs. 6 and 7, and thus prevent the unit from sagging unduly ordropping between the supports 17 if the span is further increased slightly. Under the varying angular rela tions of the bricks 22, 22 corresponding'to the very considerable range of span to which the bricks are intended to adjust and ac-- commodate themselves, the strength of the arch is substantially uniform.

As shown in Figs. 3 to (i, the bricks 2-2 are lightened somewhat by slag-retaining pockets 3-1, 34 in their lower sides.

The arch unit constitutes what may be termed a three-hinged arch; and the pivot- .point of the center hinge at 25, 2(5 HlOVQb,

up or down as the pivot points of the outer hinges shift inward and together or outward and apart, according to differences in span.

The sectional fire arch 40 illustrated in Figs. 8 and 9 differs from the arch 15 of Figs. 1 and 2 in employing brick 42 that present important differences from the brick 22 and afford important advantages.

In the case of Figs. 8 to 12, the engage ment means ofone sort is divided, and located partly on opposite sides of intermediate engagement means of the other sort. That is to say, in the form of brick here shown the convex face 45 on the projecting nose portion 47 is flanked at either side by I duplicate concave faces 46, 46, at the bottom of duplicate recesses 48, 48. As shown, each of the concave faces 46, 46 and of the- 1e cesses 48, 48 has substantially half the width 0f the convcx face 45 and the nose 4?. When, therefore, two such bricks 42, 42 are assembled as an arch unit, they do not overlap completely and lie directly opposite one'another, as in Fig. 3; on the contrary, they overlap but half way, so as to lie in a 'stag- --gered relation to one another. *dlc arch section, therefore, each of the brick '42 (excepting only the extreme front and In the midrear ones) is in effect paired in reciprocally leaning engagement with two mates,-with each of which it forms an arch unit,iustead of with one only, as in Figs. l7. Hence this middle arch section consists of a series of oppositely supported bricks multiply (doubly)intermated in reciprocally leaning pairs. By virtue of this construction, all of the bricks 42 (exceptthe first pair put in place) can be put i'n place or removed one at a time. \Vith the bricks 22 of l to 7,110 such possibility exists, because each of those bricks can be mated with but one other. I

As shown in Figs. '10 to 12, each brick 42 has in its opposite edges, at the lower side. recesses 19,.

- Vhen' the bricks 42 are assembled in an arch'seclion, these recesses 49 in ad1acent.

pockets were complete in eachbrick, as in Figs. 3 to 6.

The bricks 42 of Figs. 8 to 12 presents a further advantage over the brick 22 of Figs. 1

to 7 in that when the brick 42 is used toform a lateral half arch (Fig. 8 and 9) Testing against a sidesheet 20 of the fire box it is more stable, owing to the fact that its nose portion 47 which then engages the side sheet is in its middle instead of to one sidethere of.- The like is true when the brick 421s used to form a half'arch between twosupterrace? ports such as the tubes 17 in Fig. 12,-so that the rounded surface of the nose 47 rests on a tube 17.

In Figs. 8 to 12, various parts and features substantially like corresponding ones in Figs. 1 to 7 have been marked with the same reference numerals as in Figs. 1 to 7, as a means of avoiding merely repetitive description.

If desired, half brick 52 (similar in general form to the brick 22 of Figs. 1 to 7) may be employed to 'fill gaps that would otherwise exist in the arch 45, as shown in Fig. 8.

What I claim is:

1. An arch brick having on one end convex and concave faces, eachsyminetrical as regards the thickness of the brick, for engagement with correlatively corresponding concare and convex faces of another brick in various reciprocally leaning angular relations of such bricks on various spans.

2. An arch brick having on one end con-- vex and concave faces with coincident centers of figure in the midst of the brick, so that the brick may lean stably against another brick, in various angularrelations on different spans, by engagement of its aforesaid faces with correlative-1y corresponding concave and convex faces 01% such other brick.

8. An arch brick having on one end convex and concave faces of diameters substantially equal to the thickness or the brick midst thereof, for engagement with 'corre latively corresponding concave and convex faces of another brick in various orecrpro- .cally leaning angul r relations, of such bricks on various spans. Y

4. An arch brick having on one end convex and concave races, witli centers of figure in the midst of'tliebrick, adapted to make multiple line contact, respectively,

with coincident centers of figure in the same curvature, concentric with one another and with the thickness of the brick, for

making surface contact with correlatively prising counterpart arch brick having at one end correlative recess and projecting nose portions, with rounded concave and convex bearing surfaces of the same curvature with their centers of figure in the midst of the brick.

8. An arch brick having on one end con vex and concave faces for engagement with correlatively corresponding concave and convex faces of another brick in various reciprocally leaning angular relations of such bricks on various spans, and having shoulders adjacent such faces for engaging with corresponding shoulders on such other brick to prevent undue sagging of the brick on long spans. 1

9. A brick for sectional fire arch construction having on one end engagement means .ofone sort flanked ateither side by engagement means of a different sort, so that the brick/may lean stably against one or more similar ,brick by engagement of its flank engagement means with the intermediate engagement means of such other brick or bricks, and vice versa.

10. A sectional fire arch construction comprising an arch briclf'havmg at one end an intermediate projecting nose portion with recess portions each of substantially half its Width flanking it, said nose and recess portions being in leaning engagement, respectively, with the correlative flank and nose portions of one or more similar brick. v i

11. An arch brick having atone end a convex faced intermediate projecting. nose portion and concave faced recess portions flanking it at either side, for leaning engagement with the correlative flank and nose portions, respectively, of one or raoresimi, lar bricks. 1

12. An arch brick having onone end convex and concave faces, including an intermediate face of one sort flanked, at either side. by faces of the other sort, so that the brick may lean stably against one or more other such brick, in various angular relations on diiiferent spans. by engagement of its flank face or faces with the intermediate face or faces of such other brick or bricks and engagement of its intermediate face with the flank -face or faces of such other brick or bricks.

13. A33 arch brick having on oneend a convex intermediate face andconcisve faces flanking'its at either side, so that the brilzk may lean stably against one or more other such bricks, in various angular relations on different spans, by engagement of its convex face with the concave face 01' faces of such other brick, and vice versa'. I

In testimony whereof, I have hereunto signed my name.

CHESTER A. SIEGEL.

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