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To all whom it may concern: Be
it known that I, SAMUEL OAKMAN,
of Boston, in the county of Suffolk and State of Massachusetts, have
invented a certain new and useful Mold for Telegraphic Insulators, of
which the following is a specification: The
Nature of the Invention. The
nature of my invention consists in constructing a "point" for
forming a segment-screw inside of a telegraphic insulator, said point
consisting of a hollow tube the lower end of which is slotted. Within this
tube a segment-screw is placed, said screw turning on its axis, so that in
molding the insulator the screw-segment is at the slots in the outer tube;
but when the molding is complete the screw-segments may be turned back
within the tube and present a smooth space at the opening, thus allowing
the point to be withdrawn. Description
of the Drawing. Figure
1 is an elevation, showing the screw parts of the center-piece opposite
the slots in the outer tube, as indicated also in Fig. 3. Fig. 2 is an
elevation, as above, showing the smooth parts of the inner part opposite
the slots in the outer tube, as indicated also in Fig. 4. General
Description. Let A represent the outer part of |
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the point. This
is made as shown in the drawing, and is provided with four openings or
slots, C C C C. Within this tube the segment-screw bolt H is placed.
This screw-bolt fits a corresponding screw within the tube A. The slots
C C C C are cut through the tube A, as shown, and corresponding recesses
E E E E, Fig. 4, planed into the center part H, so that if the
screw-bolt H is turned, as shown in Figs. 1 and 3, the insulator molded
upon the device will have within it segment-screws. To
withdraw this device from the insulator I have only to turn the bolt H
to the position shown in Figs. 2 and 4. This action will present smooth
surfaces to the inwardly-projecting screw-threads of the insulator and
admit of the withdrawal of the device or “point.” K
is a guide-pin inserted in the screw-bolt H, and projecting through the
tube, as shown, so as to serve as a stop to limit the motion of the
center-piece. I
claim as my invention-- The
combination of the tube A with the center segment-screws H B B B B,
substantially as described, and for the purpose set forth.
SAMUEL OAKMAN. Witnesses: A.
HUN. BERRY, FRANK G. PARKER.
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