US826715A - Blast-furnace twyer. - Google Patents

Description

W `TN ssEs I m r w A No. 826,715. PATENTBD JULY-24, 190s.

"T, EVANS. BLAST PURNACBTWYER. APPLIOATIOFIJED DEU. 22. 1905. l

2 SHEETS-'SHEET 2.

` ments attached to a furnace.

^ enlarged view the twyer is c THOMAS EVANS, or GREAT FALLS, MONTANA.

BLAST-FURNAGE TWYER. '4

are. seems.

Speccation of Letters Patent.

Patented July 24, 1%?06.

Application filed December 22, 1905. Serial No. 298,034

To ai?, whom t may concern:

Be it known that l, THOMAS EvANs, a resident oi" Falls, in the county of Cascade and State or` Montana, have invented certain new and useful improvements in Blast-Furnace "lwyers; and l do hereby declare the following to be a'ull, clear, and exact description of the invention, such as will enable others skilled in the art to which it apper- 'tains to make and use the same.

My invention relates to improvements in blast-'furnace twyers, the object of the invention vlacing to provide an improved air-tight twyer with Vautomatic valve to close the much-rod opening in the end thereof' and not interfere with the insertion or withdraw al of the rod, provide improved means for preventing any molten metal which mightQentcr the twyer 'from reaching the valve, and resulting in a twycr which reduces leakage of air to the minimum, thus rendermg the operation of the furnace economical and at the Sametime, greatly reduces the necessity lor close attention to the furnace.

With these and other objects in view the invention consists in certain nov el lfeatures of construction and combinations and arrangements of parts, as will be more fully here'- ina'liter described, and pointed out 1n the claims.

ln the accompanying drawings, Figure 1 is a view in section, illustrating my improve- Fig. 2 is an in section of the twyer removed. Fig. 3 is a view of the cap removed, and Figs. 4, 5, 6, and 7 are views of various details oi' construction.

1 represents a blast-furnace, and 2 my 'improved twyers secured to the furnace and irovidcd with air-blast tubes apparatus. The outer end of lcsed by an air-tight cap 3,

annular flange 4 to receive the twyer end and be secured thereto by a bayonet or cam joint, and a dovetailed circular groove is made in the cap to receive a packing 4a, of asbestos or other suitable material., to bear against the end of the twyer and provide a perfect air-tight joint between the cap and twyer.

The cap is made with a central opening or sleeve 5 to receive a brass or other bushing 6, driven tightly therein. This bushing 6 has a cylindrical bore or punch-hole 7, made flared at its inner end to form a valve-seat for a valve 8, which latter is secured upon a link 9,

with any blast which latter has an hinged at its upper end to the cap as shown, and permits the valve to swing upward out of the way when the punch-rod is inserted and automatically falls and is held' tightly closed b the pressure of air remove from the twyer. ed opening is made to receive a tubular plug 10, internally screw-threaded and made with an internal shoulder 11, against which a disk 12, of lead or other fusible metal, is held by a tubular plug 13, screwed into the plug 10.

In the operation of blast-furnaces" a quantity of metallic crust forms on the inner surface of the furnace, which when an intense blast of air is supplied melts and runs down the sides of the furnace into the twyers. Should this occur with my improved twyers, the molten metal will melt the lead disks 12 `and run out the opening thus provided without coming into contact with the valve. The operator serves the molten metal running out the bottom of the twyer immediately shuts ofi the blastto that twyerand plugs the same with clay. He then puts in a new lead punches out the clay, and turns on the blast, phen the twyer is ready for operation as beore.

Slight changes might be made in the ge eral form and arrangement of the partsde# scribed without departingfrom In invention, and hence l do not restrict mysel to the irecise details set forth,- but consider myse at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention. y

Having fully described my invention, what l claim as new, and desire to secure by Le f ters Patent, is

1. A twyer for blast-furnaces constructed with an opening in its bottom, a destructible disk normallyl closing said opening, a removable cap closingr the outer end of the twyer, said cap having an opening, and a valve pivotally attached to the inside of the removable 2. The combination with a twyer, of a removable cap thereon having a circular groove, packing in said groove to bear against the end of the twyer, tion with the inside of the cap, able bushing in the cap constituting the punch-rod hole the inner end of said bushing forming a seat for said valve. Y

3. The combination with a and a remov- When he ob-v o when the rod 1s l In the bottom of the twyer a screw-threadl to the furnace, often A disk 12,

a valve having a hinged connectwyerl having ,fi-ign' opening in its bottom, *ofV a removable cap 'the inner side of said removable cap and norn 'secnred air-tight to the outer end of the twyer, mally closing the oke-ho1ea hinged valve connected With the inside of In testimouyw ereof I have signed this the cap and closing'a, punch-rod hole thei'ein, -specicetion in the presence of two subscriband Ineens for securing a lead disk in the ing Witnesses.

opening in the bottomof the twyer. THOMAS EVANS. n 4. A twyer provided at its rear end with e Witnesses: removable cap having V.a poke-hole therein O. C. PRoeToR,

and a. valve having a hinged connection with J. A. WRIGHT.'

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