Improved Spring Tongs for Forming the Necks of Glass Bottles.
Year: 1898

page_text: Date of Application, 22nd June, 1898-Accepted, 6th Aug., 1898
COMPLETE SPECIFICATION.
Improved Spring Tongs for Forming the Necks of Glass Bottles.
I, LUDWIG SCHREYER, Glass Works Manager, Köln-Nippes, Germany, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to the spring pressure tongs as generally used in glass
works for forming the necks of glass bottles. Heretofore such tongs have usually
been made only single acting, that is to say, the dies forming part of the tongs
have hitherto been only capable of acting upon the exterior surface of the bottle
neck whilst the internal surface has been formed by a solid core which is more or
less of a cylindrical shape.
As it is often necessary, with certain classes of bottles, to make their necks with
sharp-sided grooves, or beads, upon their inner surfaces the ordinary tongs with the
solid core are of no use, as, after the bottle-neck has been formed, it is impossible
to pull out the core without injuring the bottle.
This invention has for its object to so construct such spring pressure tongs that
the core, instead of being solid as heretofore, is in sections which are capable of
being forced apart so as to form the interior surface of the neck, and, when this
has been done, of being brought together again automatically, by means of a
spring, so that the core can be easily withdrawn.
And in order that my said invention may be properly understood I have here-
unto appended an explanatory sheet of drawings which shows, by way of example,
one mode of carrying out the invention.
Fig. 1 is a side view, partly in section, of the double-acting tongs with the
parts in the open position.
Fig. 2 is a similar view but with the parts shown in the closed position.
Fig. 3 is a plan view of Fig. 1 and Fig. 4 a plan view of Fig
Fig. 5 is an enlarged sectional view showing the neck-forming dies and their
spring connections.
The spindle b, which is solid and made with a spike shaped prolongation b
has secured to it, at its upper end, a steel or other spring band a which is bent
so as to form legs a¹, a². "Fitted at each side of the spike is a downwardly pro-
jecting strip and these strips are marked on the drawings, The strips,
which are pivotted at h1, h2, are connected by means of a spiral spring e at their
upper ends whilst they have attached to their lower ends the sections fi, f of the
core. These sections which form dies are, on their outside surfaces shaped so
as to correspond with the inner surface of the bottle neck to be formed.
The two legs a¹, a have fitted to their lower ends the usual metal dies h, h,
which are so made internally as to give the proper shape to the outer surface of
the bottle neck.
The tongs are operated by pressing together the legs a¹, a², of the spring band
by hand, whereupon the pins g,, which are attached to them, are forced into
contact with the upper parts of the metal strips c¹, 3, and, as a consequence, the
lower ends of the strips, to which the sections f¹, f², of the core are attached, open
"

page_text: outwards and press against the plastic glass which is between them and the
dies h, h, thereby causing the glass to assume the shape desired and so form the
bottle neck. When the bottle neck has been formed the pressure is taken off
the legs a¹, a, and, as a result, the strips c,, immediately come together again
under the action of the spring e so that the tongs can be withdrawn from the
bottle neck without altering its shape in any way.
The dies h, h, and the core sections f¹, f, may be varied in shape to suit any
shape of bottle neck that may be desired.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I consider novel and desire to claim is:
Double-acting spring tongs characterized by a core made in sections which,
simultaneously with the contraction of the external dies, can be expanded so as
to shape the interior of the bottle neck and thereafter be brought together again
by means of a spring, substantially as and for the purpose set forth.
Dated thin 10th day of Tn 1000
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent.
H. D. FITZPATRICK,
100, Wellington Street, Glasgow, Agent.