US16531A - Smith s fobghe - Google Patents

Description

UNITED STATES PATENT OFFIOE.

JOHN W. GRENNELL, OF OLIVET, MICHIGAN.

sMmHs Specification of Letters Patent No.

To all whom it may concern:

Be it known that I, JoiiN I'V. CRE'NNELL, of Olivet, in the county of Eaton and State of Michigan, have invented a new and useful Improvementl on Twyers for Smiths Forges; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l is a perspective view of the wind chest, and central partition and Fig. 2, is a perspective view of the hearth plate, de-y tached. The whole is usually constructed of cast iron.

The wind chest A is simply a square box, diminishing in size toward the bottom, and open at the top where it is flanged as at B B B to rest on stone or brick work for stationary, or on east iron legs, after the fashion of a stove, for portable uses; there is also an opening in the bottom (not shown) for cleaning out occasionally, the cover of which is a partof the handle O. This wind chest is divided into two chambers or compartments by the partition D and the hearth plate Fig. 2. The partition D has a rotating disk valve on its under side (operated by the rod E) with four holes (two of which are shown at F F) for the purpose of regulating the intensit-y of the blast, and on its upper side is a two way groove formed by the chamfered ribs G G G G, standing at a right angle; the width of said groove being equal to the side of the largest square of the twyer nozzle when fully expanded; these ribs are chamfered to a proper angle, to facilitate the upward direction of the blast. In this groove slide the two sectional chamfered nozzle pieces H H with angular slotted openings, as at I, conforming with the ohamfer of the ribs G G; they are open underneath to the partition D, which is pierced with two holes similar to those at F F. These nozzle pieces are moved by rods passing through the sides of the wind chest, and have rims J J chamfered to correspond with the two stationary ones J J Fig. 2, on

FORGE.

16,531, dated February 3, 1857.

the hearth plate around the two sides of an equilateral opening K equal to the largest extension of the nozzle, plus the width of the corner block L, which is chamfered on two sides to correspond with the rims J J J J. This block L forms a two wayed slot in which slide the projecting rims J J of the sectional nozzle pieces H H.

The ingress passage being below the partition D, the wind passes by the four valve openings through said partition into the upper compartment formed by the hearth plate, and issues through the four egress passages formed by the two slots I I, in the sectional nozzles and the two spaces left between the under side of the hearth plate and the chamfered ribs G G Fig. 1.

The peculiar advantage of this improvement is, that by the use of the two sliding nozzles H H the workman is enabled, not only to increase or diminish the area of a square formed by the four egress passages; but also, to cause the orifice to assume the form of a parallelogram, diminishing in width, at pleasure to a mere line, and extending in either a longitudinal or transverse direction across the forge. The most delicate operations of welding can thus be performed with great economy of fuel, and reduced risk of injury by overheating portions of metal that! would otherwise be continually endangered.

IVhat I claim as my invention and desire to secure by Letters Patent is- The use of the two hollow sectional nozzle pieces H H moving at right angles in a two way groove formed by the chamfered ribs G G G G Fig. l, in combination with the two wayed slotted opening K in the hearth plate Fig. 2, formed and bounded by the stationary rims J J and the chamfered corner block L whereby the moving nozzles can slide past each other and form a continuous joint in any position.

J. W. ORENNELL.

Witnesses:

GEORGE JOHNSON, JOSEPH C. FUsIK.

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