Improvements in Bungs applicable to Casks.
Year: 1892

page_text: Date of Application, 21st Nov., 1892-Accepted, 14th Jan., 1893
COMPLETE SPECIFICATION.
Improvements in Bungs applicable to Casks.
I, EMIL TROU of 53 Molkenstrasse, Bremen, in the Empire of Germany,
Merchant, 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 :-
There have already been constructed various forms of bung-closures, but up to the
present none have been in general use. The reason thereof consists in that these
closures do not fulfil all the conditions required viz.-certainty in action, simplicity
of construction and application, durability and cheapness.
The bung closure hereinafter described and shown in the accompanying drawings
will answer all the necessary requirements.
Figure 1 of the accompanying drawings is a vertical section of the closure.
Figure 2 shows the closed bung seen from below, and
Figure 3 is a side view of the bung alone.
The whole closure consists of two main parts, namely of the bung shell or
frame A firmly screwed into the cask, and of the bung B. A key C serves for
enabling the latter to be rotated as represented in Figure 1.
The closure may be made of any suitable metal; in order to obtain a good joint
a packing ring of indiarubber or other suitable material is applied to the bung.
The shell A screwed into the cask or equivalent is cut out in the manner shown in
Figure 1 so that the upper part 6 of the bung rests in the upper cylindrical
boring a and forms with its packing ring e a tight closure. Below the packing the
boring has a shoulder and into the narrowed preferably circular opening a¹ thereby
produced project two cams d under which engages the cam head fof the bung
shaft e.
g
In applying the closure the head f the shape of which corresponds with that of
the opening of the bung shell, is passed through between the cams d and then
turned into the position shown in Figure 2. In order to obtain a sufficiently strong
pressure of the packing ring c against its tightening surfaces it is necessary that
the upper surface of the head f and the under surface of d should be tightly
clamped together.
For this purpose the head fis inclined or chamfered at f¹ and f' at the right
and left hand of the shaft in a helicoidal line having a suitable inclination, whilst
the lower edges of the cams are shaped at d' d in a similar manner, that is to say
corresponding as much as possible to the thread of a screw. By turning the bung
into the position shown in Fig. 2 a tight clamping between the cams and head takes
place owing to the friction of the screw threads against each other, as by the
engagement of the cam surfaces of the head with the cam surfaces of the cams the
plug of the bung is gradually screwed in more tightly. In its closed position this
closure is quite tight and can readily be opened again. The extremely small
wearing of the metal surfaces may be disregarded because by turning the head the
former pressure is always re-established.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed I declare that what
claim is,-
1. A bung closure characterized by a bung plug introduced into a bung frame or
shell and provided with a packing ring which ring is pressed on to a seat by
turning a cam faced head formed on the plug against cam faces formed in the bung
shell or frame substantially as described and illustrated in the accompanying
drawings.

page_text: 2. The complete bung or cask closing device substantially as described and
illustrated in the accompanying drawings.
Dated this 21st day of November 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicant.