An Improvement in Bottles for Aerated Liquids.
Year: 1891

page_text: Date of Application, 26th Oct., 1891-Accepted, 28th Nov., 1891
COMPLETE SPECIFICATION.
An Improvement in Bottles for Aerated Liquids.
I, WILLIAM PRIESSNITZ BONWICK, of 59 Blomfield Road, Paddington, in the
County of London, Engineer, 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 :-
-
Bottles for aerated liquids when formed with an internal screw thread of the
ordinary rounded form in cross section or of a shape in cross section resembling the
teeth of a ratchet that acts in one direction only, the underside of the thread being
at right angles to the axis of the bottle mouth, cannot be effectually closed by
ordinary corks, or by stoppers faced with cork, on account of the liability of the
stopper to be forced out of the bottle neck by the pressure of the gas within the
bottle when the thread is of the ordinary rounded form, and of the liability of
the gas to escape between the screw thread and the cork when the thread is of the
angular form referred to and due to the inability of the cork in this case to expand
and tightly fit the acute angular groove or recess between the ridges of the screw
thread. Now my invention has reference to a construction of bottle neck designed
to obviate the disadvantages above mentioned, for which purpose I make the bottle
neck with an internal screw thread that is as seen in a central vertical section of
the bottle neck similar in form to the teeth of a ratchet that acts only in one
direction (as before) and which will be hereinafter shortly referred to as a ratchet
thread, but the groove or recess between the ridges of the thread instead of being
made of an acute angular form as heretofore usual with this class of screw thread,
is made of rounded or curved form as I will now more particularly explain with
reference to the accompanying drawing which represents the upper part of a bottle
with the improved neck in central vertical section there being shown applied to
such bottle neck, part of a combined cork and glass stopper of the kind described
in the Specification of another application for Letters Patent filed by me dated
4th December 1890 No. 19825 and which construction of stopper is therefore not
here claimed as forming any part of my present invention. As will be seen the
internal screw-thread of the bottle neck has its upper side 1 inclined to the axis of
the bottle and the underside 2 at right angles or approximately so to such axis,
whilst the bottom of the groove or recess is, according to this invention, made of
the curved or rounded form represented at 3. With this construction of screw
thread, when the cork or combined cork and glass stopper 4 is forced into the
bottle mouth, the cork will be compressed by the thread which will permit of the
stopper being inserted, but will effectually hold the stopper in place and prevent it
being blown out by the pressure of gas within the bottle, whilst the cork between
the sharp ridges will expand into and fill the spiral groove or recess and thus form
a gas-tight closure.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
A bottle having an internal screw thread of the improved form described
that is to say a ratchet thread with the groove or recess at the bottom of the tooth-

page_text: like ridge or thread rounded or curved as at 3. substantiully as shewn, instead of
angular.
-Dated this 26th day of October 1891.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.