USRE7747E - Sylvania - Google Patents

Description

J. S. & T. B. ATTERBURY,

.Assignols to Dithridg'e & C0. METHOD. OF MAKING SMOKE BELLS.

Reissued June 19, 1877.

UNITED STATES JAMES s. ATTERBURY AND THOMAS B. TTEE UEY, 0F PITTSBURG, PENN- PATENT OFFICE.

SYLVANIA, ASSIGNORS TO DITHRIDGE & 00., OF SAME PLACE.

IMVEROTVEMENT IN NIETHODSOF MAKING SMOKE-BELLS.

Specification forming part of Letters Patent No. 57,063, dated August 1,4, 1866; reissue No. 6,886, dated February 1, 1876; reissue No. 7,747, dated June 19, 1877 application filed March 30, 1877.

To all whom it may concern:

4 a full, clear, and exact description-thereof, reference being had to the accompanying drawing, making a. part of this specification, in which- Figurel is a perspective view of the upper part of the divided mold. Fig. 2 is a perspec tive view of the lower half of the mold. Fig. 3 is a view of one-half of the two molds put together, showing the form of'the' glass bell when molded in the same. Fig. 4 is a top view of the lower portion of the mold. Fig. 5 shows the form of the molded glass preparatory to shaping the lower end. Fig. 6 is a side view of a smoke-bell. Fig. 7 is a per spective view of a bell after it has been flared and finished on the fluting-former. Fig. Sis a perspective View of a coniform former by which the bell is flared and crimped or fluted at its open end. Fig. 9, by a vertical sect-ion, illustrates the last-mentioned operation,

the'bell being shown on the former, the sec tion being through the projecting edges.

Prior to our invention glass articles-were always flared by means of a hand-tool moved around along the inner edges of the open end. This method is open to the objection of being entirely dependent upon the still of the workman in securing symmetry and uniformity in the product. This lack of symmetry in the article is observable even after it has been flared and crimped, and is very objectionable. Our invention removes the tool from the hands of the workman, and by supplying a fixed invariable pattern not only gives symmetry in the article, but uniformity to the entireproduct. Byflaringwe mean belling or opening out the sides beyond lines parallel to the axis, in such a way that the thickness of the sides is not materially changed-that is, not more than is necessary to give the article a greater diameter at the end-by the simple stretch of theglass, its quantity or bulk not being increased at thatpoint.

Our invention consists, first, in forming the eye or loop by which the smoke-bell is suspended and handled by means of projections extending from the sides of the divided mold, sons to meet when it is closed; second, in enlarging or flaring the open end of a previously-formed glass article, without external pressure, by means of a coniform or tapering former placed in a suitable position, over or upon which it is pressed while the glass at the end to be placed is in a plastic condition; third, in crimping or fluting the open end of a previously-formed hollow glass article by means of a coniform or tapered former, placed in a suitable position and having radiallyprojecting ribs or edges; fonrtlr,"in' the tapered plug or former for opening and shaping the end of hollow glass articles. L

We will now describe the operation.

A A are ordinary two-part molds, united by the ordinary dovetail joint a. The cavity of the mold is such as to produce the smokebell required, one end of which is open and of cylindrical form. (See Fig. 5.) The lower section is provided with two projections, 0, one on each half, which, when the mold is closed, meet centrally.

.When the article is blown the loop or eye is made. The openingoi' the moldA withdraws the projections and trees the article, so that it can be taken out. The glass, having been blown and removed from the mold,is reheated at the end to be flared or opened. It is then opened or flared by pressing it over the coniform or tapered former G, which, not being a hand-tool, is placed in sucha position that the glass may be pressed over or upon it. The edges or projecting ribs thereof communicate the fluted form to the plastic glass when the latter is pressed against them, as shown in Fig. 9.

It is evident that the end of the previouslymade article (1, when reheated to the soft or plastic condition in which glass is worked in finishing operations, and pressed over the tapered plug or former U, will be opened out by thesame without requiring the exercise of the skilled and expensive hand-labor necessary prior to our invention for opening and flaring smoke-bells and similar articles, and that, the

. ated upon internally by a external contact with'hard or metallic forniflare communicated to .the article being the counterpart of the former, there will be a uniformity of shape in the product of the same. The flare or bell of the article being uniform, the flutes formed therein will share the same uniformity, so that by this method we can produce a highly and uniformly finished,.as well as a very beautiful, article without the aid of skilled labor, and consequently reduce the cost of production.

ltisapparent that the principle of this part of our inventionconsists in the uniform and unhampered stretch of the plastic glass on all sides, such being possible by the use of, a tapered or coniform plug or former placed in a suitable position, and the absence of external pressure. It is a fact well known to glassmanufacturers that in the finishing of hollow articles having thin sides, when being operrigid or hard tool,

ing or pressing devices is not only injurious, but in inost cases destructive to the article. What we claim as our invention, and desire to secure by Letters Patent, is 1 L The method herein described of forming bells' and other the eye or loop of the smoke-bell by projections on the inside of the mold, which, when the latter is closed, extend across the forming cavity.

2. The method of flaring glass smoke-bells and other glass articles without external press are by reheating the end to be flared and pressing it over a tapering or-coniform former,

substantially as described.

3. The method of crimping or fluting smokeglass articles by reheating the end of the article and pressing it over a tapered or coniform former having radiallyprojecting edges, substantially as described.

4. A tapered or coniforin plug or former for flaring and shaping the open end of smokehells and other articles, substaxtially as described.

In witness whereof we, the said JAMES S. ATTEBBURY and Tnoms B. ATTERBURY, have hereunto set our hands.

- J. S. ATTERBURY.

THOS. B. ATTERBURY. Witnesses: 1

DANIEL WENKE, r., F. Mn'rz.

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