US8268A - Air-tight joint for twyers - Google Patents

Description

W.GRAHAM..

TWYER.

Patented Aug. 5, 1851.

UNITED STATES PATENT OFFICE.

WM. GRAHAM, OF GARLISLE, PENNSYLVANIA.

AIR-TIGHT JOINT FOB TWYERS.

Specification of Letters Patent No. 8,268, dated August 5, 1851.

T 0 all whom it may concern Be it known that I, VILLIAM GRAHAM, (blacksmith,) of Carlisle, in the county of Cumberland and State of Pennsylvania, have invented a new and useful Il'nprovement in Twyers; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part thereof, in which that portion of Figure 1, above the red line in, 00, represents a top view; and that portion below the red line, a bottom view of the twyer. F1g. 2, represents a section through the red line :22, w, of Fig. 1. Fig. 3, represents one of the drop plugs, for closing the openings in the top of the twyer, when the whole blast 1s not required. Fig. t represents one of the bolts for securing the top plate to the bottom of the twyer, and Fig. 5, the handle for operating the slide on the bottom of the twyer.

Similar letters in the several figures represent the same parts.

The nature of my invention consists in the arrangement of the inner and outer beads on the top plate, between which is placed clay or other plastic materlal, and the grooves in the edges of the s des of the twyer, for the purpose of making an a1r tight joint, the whole being secured by bolts with projections upon them catching over a cam, cast on the flanges on the under plate.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same with reference to the draw- The body of the twyer A, is cast in a square box-shaped form, and the bottom B, thereof, has its sides so inclined toward each other as to form a hopper into which the dust, ashes, slag &c., falling through the blast openings will collect. Through the bottom of this hopper, is an opening a, which has its sides beveled from the inside to the outside thereof, leaving on the outside a sharp edge, and over said opening, on the outside of the twyer is a slide 0, which has its edge beveled off from the outside to the inside, so as to form with the beveled edge of the opening a, shears for cutting oft the slag which passes through the twyer after a heavy blast, and allows said slide to make with the bottom of the twyer an air tight joint. The slide C, is secured at its rear end by a bolt or rivet D, upon which it may swing, and secured to the slide by the same rivet is a spring Z), which projects to nearly the front of the slide, and holds it firmly, up against the bottom of the twyer. The sides of the twyer are vertical, and on the top edge of said sides are cut-the grooves o, for a purpose which will be hereafter described.

On the bottom plate B, are cast flanges E,

through the holes (Z, in which pass bolts,-

which secures the twyer in its bed on the hearth. There are also through said flanges holes which have a slot f, which are cut through the bottom plate meeting them, for the purpose of passing through said holes, and slot, the bolt F, and its projection or arm 9, and on the underside of said flanges E, and around the holes is cast a can1,over which the arm 9", of the bolt catches, and draws down firmly the top plate (to be hereafter described) so as to make a close joint.

The funnel G, of the twyer, which is cast with the main body thereof, has a slight inclination upward, so as to be adapted to the nozzle of an ordinary bellows, which has a similar inclination in a contrary direction, and which allows the twyer to lie perfect-1y level on the hearth.

The top plate of the twyer is cast separate, and has upon its four sides the lugs H, through which are slotted holes h, similar to, and so arranged as that any two of them will stand directly over the holes in the flange on the bottom, and through said holes and slots pass the bolts and their arms or projections 9, before described, said arms catching over the cams on the bottom plate, and by turning said bolts the top and bottom parts are drawn firmly together. These bolts are found to be a much better fastening than screw bolts, or keyed-bolts, for the latter by the action of the fire becomes so cemented as to make them very difficult to be removed. By making the twyer square, the top plate can be turned, so as to bring the blast openings into convenient position for making a long or broad heat, as may be desirable.

On the underside of the top plate are double beads or projections 2', between which the sides of the body of the twyer come, and between which beads, when the twyer is to be put together is placed clay or other material, so that when the top and bottom of the twyer is drawn closely together by the bolts F, the clay will fill up the groove 0, in

the top of the sides, and the space'between the beads 2', and the sides of the twyer, so as to make an air tight connection.

011 top of the twyer is an elevation I, which is divided by three wedge-shaped partitions J, and which forms the conical chambers K, through the holes j, in which the blast issues. The sides is, of the conical chambers K, project downward below the general line of the top of the twyer, so as to present a larger opening in the interior, for the purpose of taking in a larger body of air, and as the chamber K, gradually diminishes toward the exit j, the blast is contracted and issues with greater force. The spaces 5, between the openings 7', in the top of the t-wyer are grooved out so as to allow the dust, ashes &c., to slide off from said openings, instead of falling into the interior of the twyer.

L, Fig. 3, represent drop plugs which may be inserted from the outside into the openings 3', when the whole blast is not required for instance in heating light work. These drop plugs are provided with a flange m, so as to catch over the tops of the openings aforesaid, to prevent the plugs from falling through, and to stop any air from issuing through said openings.

On the slide G, underneath, is cast a double headed lug a, over which is placed an opening 0, in the end of the handle M, Fig. 5, for the purpose of moving the slide to cleanse the twyer, and which may be readily detached when notrequired for that purpose.

Having thus fully described my invention, what I claim therein as new, and desire to secure by Letters Patent is The combination of the inner and outer beads on the top plate, between which is placed clay or other plastic material, and

the grooves in the edges of the sides of the twyer for the purpose of making an air tight joint, the whole being secured by bolts with a projection upon them catching over a cam cast on flanges on the under plate as herein described and represented.

WM. GRAHAM. WVitnesses:

T. C. DONN, A. B. HOUGHTON.

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