US370865A - Device for protecting boiler-tubes - Google Patents

Description

(No Model.) V

.. W. HAGUE & W. B. OOOKSON.

DEVICE FOR PROTECTING BOILERTUBES. No. 370.865. Patented Oct. 4, 1887.

N. PETERS. Fhoip-Litbagnphur. Wahinglon. D. C.

UNITED STATES PATENT OFFICE.

WALTER HAGUE AND WILLIAM BOWMAN OOOKSON, OF PITTSBURG, AS-

SIGNORSOF ONE-THIRD TO JOHN OMMERT, OF ALLEGHENY COUNTY,

PENNSYLVANIA.

SPECIFICATION forming part 01' Letters Patent No. 370,865, dated Qctober 4, 1887.

Application filed June 22, 1857. Serial No. 242,178. (No model.)

tion of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

Our invention relates to an improved device for protecting and equalizing the temperature of the front portion of boiler-tubes, the object being to provide a means whereby that portion of the boiler-tubes subjected to the greatest heat may be protected or shielded, thereby to some extent equalizing the temperature of the tubcs,which allows the same to expand and contract more evenly,which being the case will preventleakage at that point; and with this end in view our inventionconsistsin a corrugated shield or inner cover placed in the end of each tube at the point of connection with the firebox of the boiler, together with certain details of construction and combination of parts, as

0 will be fully described hereinafter.

In the accompanying drawings, Figure l is a sectional elevation of a portion of a boilertube attached to the rear wall of a fire-boxsuch as are now in common use-and having 5 attached thereto one of our improved protectors constructed in accordance with our invention. Fig. 2 is a perspective view of our. im-

provement detached from the tube.

To put our invention into practice with the 0 ordinary boiler-tubes, a, attached to the rear wall, I), of a fire box forming a part of a loco: motive or other boiler, we provide a short section of a tube, 0, somewhat less in diameter than the boiler-tubes. The section 0 is corru gated at ein the direction of its length and provided with an outwardly-projecting flange, f. This section 0 we divide by a single out, 9, extending lengthwise of the same, for the double purpose of allowing the section 0 to frcelyexpand and contract and be easily entered into the tubes a.

If desired, the sections 0 may be constructed without the corrugations e, as a plain surface will answer the purpose.

In all tubular boilers ithas been ascertained by actual practice that the first leakage of the boiler will take place at the intersection of the front portion of the tubes at with the fire-box,

which portions are subjected to an intense.

heat, being in close contact with the lire, therefore expanding and contracting unevenly with the other part of the tubes a. To obviate this we secure a shield or protector, 0, such as described, in each of the tubes at at a point where the same is secured to the fire-chamber; The corrugations 6 along the sides of the shield c serve to hold the same away from the inner wall of the tube a, leaving a space, h, through which a current of air may circulate, thus protecting the tubes a and equalizing the term perature of the same.

Having thus described our invention, what we claim, and desire to secure by Letters Patcut, is-- In combinatiou'with a boiler tire tube, the corrugated section 0, provided with an outwardly-projecting flange, f, and cut or divided along one side in the direction of its length, as and for the purpose described.

WALTER HAGUE. WILLIAM BOWMAN COOKSONv Witnesses:

JOSIAH W. ELLs, M. E. HARRISON.

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