US1042044A - Boiler construction. - Google Patents

Description

D. D. SHIERK.

BOILER CONSTRUCTION. APPLICATION FILED OUT. 6, 1911.

Patented Oct. 22, 1912.

UNITED STATES PATENT curios.

DEARELL D. SHIERK, 0F ROCKFORD, ILLINOIS, ASSIGNOR OF ONE-HALF TO WILLIAM C. FARQUHAR, OF ROCKFORD, ILLINOIS.

To all whom it may concern:

Be it known that I, DEARELL D. stimuli, a citizen of the United States, residing at Rockford, in the county of lVmnebago and State of Illinois, have invented certaln new and useful Improvements in Boiler Construction, of which the following is a specification.

The object of this invention is to overcome the objection to the ordinary construction of flue boilers, in which the flues connected to the back flue sheet, are burned out and leak, this often leading to great damage. I overcome these objections by expanding the back flue sheet inward forming a flange to which the flue is connected, thereby remdving' the joint from the fire.

In the accompanying drawings. Figure 1 is a transverse section through the fire box of a locomotive boiler showing the back flue sheet and the flue openings. Fig. 2 1s a section on line a a Fig. l.

The boiler shown in Fig. l, with the exception of the connection of the flues with the back flue sheet is of the ordinary 1000-. motive construction and is illustrated to show the location of my Improvements.

The rear flue sheet 1 of the boiler is formed with an inwardly extending flange or nipple 2 expanded from the metal forming the flue sheet and is provided with external screw-threads 3. A shoulder 4 is formed at the base of the screw-threads.

A flue 5 has one end provided with internal screw-threads 6. The flue is threaded over and upon the flange or nipple 2 and is turned hard against a Washer '7 placed against the shoulder 4 thereby forming a water tight joint. through an opening. in the head flue sheet 8 and is rolled in the usual manner.

- Heretofore boiler flues have been beaded Specification of Letters Patent. Application filed October 6, 1911.

at this The flue 5 is inserted Patented Oct. 22, 1912. Serial No. 653,241.

against the outer face of the rear flue sheet in order to make a tight joint. The heat coming in contact with the end of the flue point would soon expand the bead from the flue sheetv and cause a-lealo. The flue would be beaded-again and again until the material for forming the bead Wasdestroyed or the flue sheet rendered Worthless. It is a known fact. that a flue, a short distance from the rear fiue'sheet was as good as new, therefore it has been the common usage 'to cut ofl the burned endof the flue and Weld on a section to t-akethe place of the burned section. 4

My improvements enable me to locate the joint 9 between the flange and the flue some distance along the direction of theflue so as to remove it from the action of the fierce heat generated in the firebox, and byso doing, the flue will never burn out.

As the flange 2 is formed from the material of the rear flue sheet there is no joint which is subjected to the fire, therefore the flange will last as long as the flue sheet.

Iclaim as my invention.

In a boiler, the combination with a flue sheet having an inturned integral nipple that is externally threaded, and has an external annular shoulder at the end of the threads, of a flue having one end internally threaded and screwed upon the nipple, and 4 a packing gasket surrounding the ni ple and interposed between the shoulder an the adjacent end of the flue.

In testimony'whereof I have hereunto set my hand in presence of two subscribing witv nesses.

DEARELL D. SHIERK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. G.

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