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To all whom it may concern: Be
it known, that I JAMES M. BROOKFIELD,
of Brooklyn, Kings county, and-State of New York, have invented a new
and improved Mode of Forming Glass Insulators; and I do hereby declare
that the following is a full, clear, and exact description thereof,
Which will enable others skilled in the art to make and use the same,
reference being had to the accompanying drawing forming part of this
specification. My
invention relates to glass insulators, and consists in an article of
improved form, and also in certain improvements in machinery, by which
the article is made, as well be specified more particularly hereinafter.
The
invention also comprises the combination with the former of a follower,
for pressing down into the top of the mold, to prevent the overflow of
the glass, and to give form to the bottom of the insulator. Figure
1 represents a front elevation, partly in section, of a machine, showing
one arrangement of means for operating the former;
Figure 2 is a side elevation of the same; Figure
3 is a section through the mold and follower, showing the former when
screwed into the glass;
Figure 4 is a plan view of the molds used for giving the exterior shape to the insulators and holding the glass while the action of the former is taking Place. Similar letters of reference indicate corresponding
parts. These
glass insulators are now formed, in respect to their exterior shape, and
with smooth sockets, by placing the molten glass in the two-part hinged
flasks or molds A, and forcing a smooth former into the molten glass
from the top, the said molds being open thereat, and charged with a
sufficient quantity for one insulator by pouring it in at the said
opening. I now propose to form the screw-threads by which the insulators are screwed onto the supporting studs, at the same time the exterior shape is produced and the socket formed, by means of a screw-threaded mandrel, B, arranged in a suitable |
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screw-threaded
support, C, and with suitable means for screwing it down into and onto
the glass, while in the mold and under the former, either wholly forming
the socket by the screw-threaded former, or first partially forming the
same by a smooth former or plunger, pressed into the glass, and to this
end I provide a table D, for the mold A, a support, C, for the former,
with screw-threads of the same pitch as
those on the former, and so arranged, relatively to the table, that the
mold may be Placed under it, to receive it in the center of the glass,
while the latter is in a plastic state. The
follower is allowed to remain until the glass solidifies, and is then
withdrawn. I
also provide, as one means of turning the former, a crank, E, on the top
of the shaft of the former, or, in another arrangement I place a
bevel-wheel on the said shaft, and gear it with another larger
bevel-wheel, on a horizontal shaft, provided with a driving crank
F
is a follower, suspended by a bar, G, from the shaft of the former, at
the upper end by rods H, capable of sliding up and down in the bar G,
and having adjustable nuts, I, to limit their downward movement. They
also have springs K, arranged to press the follower down. This
prevents the glass from being forced over the top of the mold, and gives
shape to the bottom of the insulator.
Having
thus described my invention, I
claim as new and desire to secure by Letters Patent --- 1. The combination of divided die A, constructed
internally as shown in fig. 3 of drawing, with a mandrel, B, threaded on
its lower end, so that the insulator will be threaded in its Center,
while the divided die will allow of its removal, notwithstanding its
irregular external form 2.
The combination of divided die A, constructed internally as described,
and the end-threaded mandrel B, with the follower F that presses upon
the plastic glass and forms the bottom of the insulator, in the manor
described. JAMES M. BROOKFIELD. Witnesses:
GEO. W. MABEE, ALEX. F. ROBERTS. |