US1203423A - Apparatus for drawing glass. - Google Patents

Description

I H. G. SLINGLUFF. APPARATUS FOR DRAW1NG GLASS. 1 APPLICATION FILED NOV. 1. m2. RENEWED APR. 1,1916. 1,203,423.

Patnted Oct. 31, 1916.

I ATTDORNEYT UNITED srA'rEs PATENT orrron.

HARRY G. SLINGLUFF, OF MOUNT VERNON, OHIO, ASSIGNOR T PITTSBURGH PLATE GLASS COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF IEENN'S'YIII- VAN IA.

APZPARATUS FOR DRAWING GLASS.

Patented Oct. 31, 1916.

Application filed November 1, 1912, Serial No. 729,080. Renewed April 7, 1916. Serial No. 89,725.

To all whom it may concern:

Be it known that I, HARRY G. SLINGLUFF,

.a citizen of the United States, residing at granted to me for the new and useful Improvements in Apparatus for Drawing Glass, of which the following is a specification.

This invention has reference to the provision of an improved apparatus such as is' used in connection with the drawing of glass cylinders in the manufacture of window glass. The first of the objects of my present invention is the construction of apparatus of the character specified in which the bad efi'ects of uneven temperature ondifierent sides of the cylinder are automatically obviated. In the-drawing of-cylinders from socalled deep furnace extensions which project at one end of 'the main furnace, it is found that the heat of the main furnace will interfere with the uniformity of production on opposite sides of the cylinder because that side of the cylinder being drawn which is nearest the body of the furnace will generally be exposed to a greater degree of heat than the side of the cylinder which is more remote. In the practice of my invention, I provide means for compensating for such unequal heating eifect and thus obtain a cylinder which will be of substantially uniform thickness all around and avoid the formation of other defects in the glass such as ropy structure or a structure not of the highest grade.

In order that my invention may be better understood, I have illustrated it in preferred form in the accompanying drawings wherein- Figure l is a plan view of a deep furnace extension with 'my improvement applied thereto, and Fig. 2 is a sectional view taken on the line II-II of Figure 1.

I have not shown in these drawings the apparatus employed forraising the bait or shown a portion of the main chamber of the furnace marked 3 containing a body of molten glass, 4, which extends out into a furnace ektension, 5, having in the upper part an aperture in which is placed a top-stone,

6, constructed to be raised and lowered so and it is of course provided with suitable means for raising and lowering it and with a cap or cover to close the opening 7 when the stone is raised and the drawing is not taking place. The blow-pipe or bait which I have indicated at 8 may be of any known form and is provided with a tubular handle or stem 9 through which air under pressure is admitted in the usual way, and with suitable raising and lowering mechanism.

In a position partially immersed in the body.of glass, t, and underneath the topstone, 6, I place what may be called a drawstone, 10. This draw-stone is preferably square as shown, to prevent it rotating by engagement with the projecting parts 11, and is also preferably wedged in suitable position within the glass by means of the wedges 11. This construction permits of vertical adjustment of the draw-stone. IVithin the draw-stone 10 which somewhat resembles a ring in shape, there is a chamber which has on the side away from the.

- clearly shown in Figure 2. At the opposite for supplying said bait with air which is side of the chamber within the draw-stone, 10, that is, the side which is nearest the body 3 of the furnace, I provide a sloping wall, 13, which extends a considerable distance beneath the surface of the glass, and is preferably gradually decreased in the amount of its incline until it merges with the vertical wall, 12, on the opposite side, thus producing in general the effect of an offset tubular aperture in the draw-stone indicated in Figure 1.

The operation of my invention is substantially as follows. A cylinder, indicated at 14, being started upward by means of the bait 8 and blow-pipe 9; from the surface of the glass within the draw-stone 10, the

effect of the heat on opposite sides of the p draw-stone, which is at a lower temperature near the wall 12 than it is near the wall 13 will tend such an equilibrium of forces is encountered as will hold fixed position with regard to the drawstone, which normally I have found will be at some place or zone where the wall of the cylinder at the right as indicated at 15 Will be in position over the inclined surface 13 which is under the surface of the glass. The square shape of the draw-stone 10 serves to keep the inclined surface 13 on the side nearest the body of the furnace, and the combination of the said inclined surface 13 in that position and the substantially upright surface 12 on the opposite side of the draw-stone, I have found in practice automatically serves to hold the cylinder in its proper position and also avoids the ropy and imperfect effects otherwise produced by other forms of apparatus. he draw-stone 10 is to be made of any suitable material, .but I prefer the use of certain kinds of refractory clay ordinarily employed in this class of construction.

aving thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the following:

1. In combination in apparatus for drawing glass cylinders, a drawing tank containing a body of glass and heated to a greater extent on one side than on the other, draw stone lying in the tank surrounded by the glass thereof,

substantially vertical.

.2. In combination in apparatus for drawthat such remaining it relatively in substantially side of the vertical plane of the remaining portion of the periphery of the cylinder so portion is unshielded from the body of glass beneath the draw stone.

3. In combination in apparatus for drawing glass cylinders, a drawing tank oontaining a body of glass and heated to a greater extenton one side than on the other, and a draw stone lying in the tank surrounded by b an opening therethrough with the wall thereof toward the more highly heated side of the tank extended laterally beneath a portion ofthe edge of the cylinder being drawn and having the opposite wall of the opening lying to one side of the vertical plane of the remaining portion of the periphery of the cylinder so that such remaining portion is unshielded from the body of glass beneath the draw stone.

4. In combination in apparatus for draw ing glass cylinders from a body of glass heated to a greater extent on one side than on the other, a draw stone lying partially immersed in the bodyof glass and having surface of the glass.

5. In combination in apparatus for drawing glass cylinders from a body of glass heated to a greater extent on one side than on the other, a draw stone lying partially surface of the glass being nearer to the side of the body of glass most highly heated than the center of the other area. In testimony whereof I have hereunto signed my name in the presence of the two subscribed Witnesses.

HARRY G. vSLINGrLUFF. Witnesses:

H. .1 IIITRER, BANNER M. ALLEN.

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