US1027326A - Ignition-arch for furnaces. - Google Patents

Description

W. M. DUNCAN. IGNITION ARCH POB. FURNAGES.

' rrmuumx Hmm AUG. 1s, 1911.

Patented May 2.1, 1912.

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W. M. DUNCAN.

IGNITION RGB Fon FURNAcEs. y APPLIOATIOH FILED AUG. 1B, 1911.

1,027,326. mummy 21, 1912.

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- UNITED STATES WILLIAM MILLE-:u DUNCAN, ornmomILmNoIs.

IGNITION-ARCH FOR FURNACES.

Specification of Letters Patent.

Patented May 21, 1912.

Applicationled August 18, 1911. S-erial No. 6454,733.

, monly comprise pluralities of rows of heat radiating blocks mounted on suitable sup-v ports to which they are fitted in a manner to'permit the ready mounting of the blocks Arches of this descriptioncom-l and their removal when they becomev impaired by subjection to heat inthe furnace.

It is 'a fact well known that the heat radiatingblocks at the rear ends of the ignition arches become impaired much more rapidly than do t-he blocks in front ofthem, and also that when such impairment of the rearmost blocks occurs, there is frequently, if not usually, such impairmentl of the block supporting members as to render them unfit to receive new. blocks it may be desired to substitute for those that have become impaired.

The object of my present improvement is to provide in connectlon With the main block supporting members ofI 4an ignition arch auxiliary block-supporting members adapted to receive the rearmost -heat radiating blocks, and which auxiliary supporting members are separable from the main supporting members, thereby making it possible to replace them by similar auxiliary supporting members when those previously in use have become unserviceable.

Figure I is a view partly in side elevationand partly in longitudinal section of an lock supporting members and a fragment .of one of the main block supporting members, the parts being shown separated from each other.

y In the accompanying drawings :-`A and ignition arch containingjmy improvement,

B -designate the transversely ."arranged heat blocks A being those entering into the structureof the arch throughout its main and front end while the blocks B are those lo# are the most liable to become injured or Impaired by the greater heat they are subjeeted vto as compared with the heat to which The heat radiating blocks are provided with longitudinal perforations extending therethrough and" they are arranged in rows 'exgrate. The longitudinal perforations a in the blocks A'receive main supporting rods 1 on which the blocks A are threaded. The main block supporting rods are shown in the drawings, (see Figs. I and II), of tubu- Alar form, and they are preferably made of this form' to permit circulation of air therethrough in order that the rods will withstand greater heat t-han they would without circulation of air through them.` The main supporting rods are suspended from suit able supports, such as beams 2, by suitable hangers 3 held in engagement with the beamsk in .any suitable manner. The longitudinal perforatins in the heat radiating blocks B receive auxiliary supporting rods 4 that are removably connected to the' main supporting rods A. These auxiliary support-ing rods are preferably tubular'to persame object in view as that sought in making the main supporting rods tubular. Each auxiliary block supporting lrod is provided with a reduced inner end providing a stem rod and which extends forwardly from a shoulder 6 on the rod. The auxiliary sup'- 5 of the former into theL latter until the shoulders 6 of the auxiliary support-ing rods abut against the rear ends of the main supporting rods, as seen in Fig. II, subsequently to which the auxiliary supporting rods -4 will remain in alinement with the main supporting rods 1 and the joined thereon.

It will be noted on referring to Fig. II thatthe main block supporting rods l project only to the rearmost blocks A and that the remainder of the blocks are subjected.

tending longitudinally above the furnace mit circulation of air therethrough with the 5, of` less diameter than the body of the supporting rods will serve as units for the support of heat radiating blocks mounted' -radiating blocks of `my ignition Varch, the

cated at the 'rear end of therarch, and which qporting rods 4 are connected to the main supporting rods l by slipping. the stemsl consequently should the auXiliary supporting rods 4 be so impaired by heat as to be rendered unfit for use, the rear portions et' the main supporting rods l are not subjected to a suiiicient degree of heat to impair them, and they therefore remain in serviceable condition to receive new auxiliary supporting rods. Therefore, when there is occasion for replacement of the rearmost blocks B and the auxiliary supporting rods supporting them, such replacement may be readily carried out by the simple acts of `removing the blocks B, the auxiliary supporting rods, and the substitution of new auxiiary supporting rods and new blocks B.

I claim l. An ignition arch comprising longitudinally arranged tubular main 'supportingl rods locatedat the frontend of the. arch, heat radiating blocks mounted on said main supporting rods, longitudinally arranged auxiliary supporting rods having reduced ends and located at the rear end of t-he arch and having their reduced ends inserted in said main supporting rods, and heat radiating blocks mounted on said auxiliary supporting rods.

2. An ignition arch comprising longitudinally arranged tubular main supporting rods located at the front end of lthe arch, heat radiating blocks mounted on said main supporting rods, longitudinally arranged tubular auxiliary supporting rods having reduced ends and located at the rear end of the arch and having their reduced 'ends in- 35 serted in said main supporting rods, and heat radiating blocks mounted on said auxiliary supporting rods.

WILLIAM MILLEN DUNCAN.

In the presence of- A. B. SrRA'rroN, Gr. D. EUNCAN.

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