US1712071A - Ignition arch - Google Patents

Description

B. DOBIE IGNITION ARCH May 79 @2% 2 sheets-sne'et Filed Feb. 3, 1923 Patented May 7, 1929.

UNITED STATESl PATENT, OFFICE.

BRADLEY DOBIE, F ELMHUiBST, NEW YORK, ASSIGNOR '10 AMERICAN ARCH COM- PANY, OF NEW YORK, N. Y., A CORPORATION 0F DELAWARE.

IGNITION ARCH.

Application led February 3, 1923. Serial No. 616,648

This invention relates to furnace structures and particularly to ignition arches, such as are used,rfor example, in stoker tired furnaces. i

One of the objects of my invention is to provide a sprung ignition arch of such character that ordinary unskilled labor can be employed to effect replacement or repairs. I

Another object of my invention is to provide an improved form ot ignition arch of sectional construction permitting of the replacement or renewal ot damaged or worn out portions without involving the loss or waste of' the sound portions, as has hitherto been the case in arches of the type to which -this invention is particularly directed, as

will further appear.

Still another object of my invention is to provide an independent support for the ignition arch with respect to the wall beneath4 which it is carried; and also the arrangement of the arch supporting means in such manner as to be attachable, detachable and, renewable without disturbing such wall.

In general, my invention contemplates the provision of an limproved ignition arch p which is practical; simple to apply; involves very low maintenance cost; 'and oii'ers more satisfactory ignition conditions.

The foregoing, together with such other objects as may hereinafter appear, or are incident to my invention, I obtain by means ot a construction, the preferred embodiments of which are illustrated in the accompanying drawings, wherein:

` Fig. 1 is a fragmentary cross sectional view ot' a portion of a stoker red Jfurnace, illustrating the application of my invention thereto; Fig. 2 is a section taken on the line 2--2 of Fig. 1; Fig. 3 is an enlarged crossI section illustrating details of my invention; and Fig. l is a front elevation of portions ot Fig. 3.

Referring now to Fig. 1, the reference letter A denotes a portion of the combustion chamber, defined in part by the main arch B, the front or curtain wall C and the ignition arch D. The Stoker mechanism is diagrammatically indicated at 7 the refer- .ence character 8, indicating the firing opening through which the green coal is introduced by the Stoker mechanism. The side walls ot the combustion chamber are shown at 9 in Fig. 2.

In the practice heretofore employed in ignition arches of this type, the arch was composed of a row of bricks or tile of the required dimension, such bricks being supported by hangers, hooked in a wall supporting channel so as to lie behind the bricks of the front wall. .Certain difficulties were incident. to this arrangement, one of such difficulties being that if it was desired to renew or replace one of the hangers, the front wall would have to be broken out.` Another diiiiculty was that any inaccuracy in punching of the channels or in the manufacture of the hangers or the bricks would result in difiiculty in installing the arch.

The bricks or tiles themselves were also et large dimension which involves diiiiculties in manufacture, shipment, handling and installation, as Well as marked spalling in service due to heavy internal stresses.

Furthermore, the inner portion of the tile would wear out much more rapidly than the outer portion, but in making repairs the sound portions of the brick would have to be discarded.

My invention, among other things, is intended to overcome these diiiiculties and to this end I construct each tile F of split brick, preferably of what may be termed quarter brick.

Referring now to Figs. 3 and 4, it will be seen that each tile comprises a right and left-handed inner quarter brick 13, and right and left-handed outer quarter brick 14, the upper ends of the quarter brick being formed so as to produce, when assembled, a T-shaped head 15. The course or row of tile is supported by means of suspension hangers 16 engaging the heads 15, for which purpose they are provided with heads 17. Pairsof these suspension hangers 16, which extend transversely ot the arch and of the support 19, are carried on supporting devices or brackets 18 secured against the lower face of the front wall supporting structural work 19, that extends along the arch beneath and at the outer side of the wall, and of the arch as well, in the manner illustrated in Figs. 3 and 4. Each bracket 18 is provided with a pair of hooks 20 and a pair of hooks 21, on its depending portion `18 and on its overhead portion, respectively, and each hanger has a hook `20 at its outer end and a hook 21 at its inner upper end, respectively. adapted to engage a hook 20 and a hook 21.

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The hangers 16 are thus supported as against displacement in a direction vtransversely of the arch but they can be assembled or de` tached on relative movement of translation in a direction, longitudinally of the arch. The hooks on the hangers have rounded faces, as shown, so that they lloat or rock to permit the tile to expand and contract and to accommodate themselves to the spring ot the arch., It will also be seen that the arrangement is such that it' for any reason it is desired to remove or replace a hanger, access can be had by removing or breaking out two quarter bricks.

The upper edges of the tile, the head 15 and the hangers 16 are inclined so that the tile will be held in position, in which connection the downwardly depending leg 18 et' the bracket serves to prevent the bricks from sliding olf the hanger.

The gap between the bottom of the front or curtain wall C and the quarter bricks 13 is illed by bricks 22, such bricks being wedge-shaped so that the tile serve to position them.

In so far as the arch supporting mechanism is concerned, it will be seen that this is of such character that the ignition arch is independent ot the t'ront wall and can be installed, repaired and replaced without disturbingr said wall in any manner, by displacing the inner and outer brick sections 13, lll in the same direction (inward) sidewise or' the supporting means 19v and of the arch and the wall C, while at the same time the supporting means can be inserted and removed and replaced without disturbing the front wall. In addition the metal parts are fully protected against the heat and are eX- posed toward and accessible from the exterior.

In so far as the arch is concerned, this, it will be seen, is composed of much smaller bricks than heretofore, the split brick being more easy to manufacture, ship and handle, and less liable to spalling because the internal stresses to which they are subjected in service are not nearly so great. The inner portions Lot' the ignition arch nearest the source of greatest heat deteriorate much more rapidly than the outer portions and by my improvement in dividing the arch into sections transversely, any one cr' more of the bricks constituting the inner section can be renewed without disturbing the bricks constituting the outer' section. This is ordinarily done by breaking out the damaged brick or bricks and sliding new bricks into the spaces left.

With respect to the hanger mechanism, it will be secu that this is olf simple character and permits the aridi to expand and contract both longitudinally and transversely. One reason why sprung arrhes have not been widely used, and this is particularly true with respect to ignition arches, is that skilled labor is required to install and maintain such arches, but by my improvements unskilled labor can install and maintain the arch. Side thrust on the side walls is reduced to a. negligible factor and the incoming fuel is effectively subjected to radiant heat trom the sprung arch.

OtherY advantages will occur to those skilled in the art.

that I claim is:

1. A supporting system it'or an ignition arch comprising a longitudinal support, a bracket with a depending portion carried by said support, and tile-engaging means tloatingly mounted on said bracket extending and inclined transversely of said supporting means, downward in the direction of said depending portion oi said bracket.

2. A supporting system for' an ignition arch comprising a longitudinal support, a supporting device carried thereby with a depending portion at one side, and a brickengaging support extending transversely ot said longitudinal support, hooked to the upper portion of said device at one eid and to its said depending portion at the other end.

In testimony whereof, I have hereunto signed my name.

BRADLEY DOBIE.

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