Year: 1885

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I ALEXANDER RICHMOND STOCKER of 76 Glengall Road, Peckham, in the
County of Surrey, Manufacturer do hereby declare the nature of this invention to
be as follows:-
This invention has for its object improving the tightness of fit in screwed or
bayonet joint plug stoppers and is more particularly though not exclusively
applicable to stoppers made of clay dust earthenware or other material capable of
being fashioned by compression in matrices-I reduce the diameter of that part of
the plug between the enlarged head and the annular groove which usually receives
the ordinary packing ring and I spring edgewise into the said groove an annular
collar or washer of rubber or other suitable material which projects sufficiently
beyond the sides of the stopper to allow of its folding or being pressed back over
the upper edge of the groove around and against the reduced part of the stopper
above referred to when being inserted into the neck of the bottle thus leaving only
a comparatively small surface or annular ridge in actual tight contact with the
neck of the bottle. By this means I obtain a tighter closure reduce the strain on
the screw threads and am enabled to screw the stopper well home at once
without any resistance resulting from the recoil action of the rubber packing as
ordinarily applied.

page_text: Improvements in Plug Stoppers for Bottles, Jars, and similar
Receptacles.
I ALEXANDER RICHMOND STOCKER of 76 Glengall Road, Peckham in the
County of Surrey Manufacturer 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 has for its object the improving the tightness of fit in that class
of plug stoppers which are provided with a screw thread or projections engaging
with an internal screw or inclined groove in the neck of the bottle or other
receptacle by so constructing the stopper so that the outer or upper portion of the
rubber or other packing ring employed shall by the act of tightening home the
stopper in the neck of the receptacle be folded over or pressed back against a
rounded annular ridge or projection forming the upper side of the annular groove
which receives the packing ring whether situate at the upper or lower end of the
plug of the stopper the said folded or pressed back portion of the packing ring
being by preference received round a part of 'the plug of reduced diameter. By
this arrangement only a comparatively small surface or annular ridge is in actual
tight contact with the interior of the neck of the receptacle, I thus obtain a tighter
closure, reduce the strain on the screw threads and am enabled to screw the stopper
tight home at once without the resistance or recoil action resulting from rubber or
other elastic packing rings when applied in the ordinary manner to this class of
stoppers.
Figure 1 of the accompanying drawings is a side elevation of my improved
'screwed plug stopper detached showing the application thereto of a flat projecting
packing ring inserted edgewise into a groove at or near the upper end of the plug.
Figure 2 is a similar view of the same stopper fitted with a slightly modified
form of packing ring which may be of cylindrical shape before it is sprung into the
groove in the stopper.
Figure 3 is a vertical section of a portion of a bottle neck with my improved
stopper screwed tight home therein, and
Figure 4 is a similar view showing the packing ring and annular rounded ridge
or projection as situate at or near the lower end of the plug.
a is the screwed shank of the stopper and 6 the enlarged head thereof the
stopper being made of any suitable material or composition but by preference of
compressed clay dust or of plastic clay or like material capable of being moulded or
shaped by suitable dies and matrices.
I prefer to employ for this purpose a combination of dies and matrices con-
structed and arranged substantially as described and claimed in my specification
No 3810 A.D. 1885 filed concurrently herewith but adapted or modified of course
to the particular shape of stopper required to be produced as will be readily
understood.
c is the rounded annular ridge or projection over or against the periphery of
which the packing ring d is folded or pressed back when tightening home the
stopper the said ridge or projection forming the upper side of the groove & which

page_text: receives the packing ring. f is the reduced portion of the plug immediately above
the rounded annular ridge or projection c to accomodate or receive the upper
portion of the packing ring when folded or pressed backwards as shown in the
drawings. The neck g of the bottle or other receptacle intended to receive my
improved plug stopper is screwed internally and by preference made slightly
conical as shown at h h (Figures 3 and 4) at the part corresponding to the position
occupied by the packing ring therein when the stopper is screwed home so that the
upper part of the packing ring may be gradually folded or pressed back over
the rounded ridge c and nipped between it and the interior conical surface h in
the neck of the receptacle.
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 claim is
1. A screwed plug stopper wherein the packing ring is so applied as to be
partially folded or pressed back by the screwing home of the stopper over a
rounded annular ridge on the upper side of the groove holding the packing so as
to reduce the surface of the packing in actual tight contact with the neck of the
receptacle substantially as and for the purpose specified.
2. A screwed plug stopper having the portion of the stem above the groove
which holds the packing ring reduced in diameter so as to receive or accomodate the
upper portion of the packing ring when folded or pressed back by the tightening of
the stopper in the neck of the receptacle.
3. The combination in a screwed plug stopper of an annular groove to hold the
packing ring an annular rounded ridge or projection immediately above the said
groove and a reduced portion of the plug of the stopper immediately above the
annular rounded ridge or projection substantially as and for the purpose specified.
Dated this 24th day of December 1885.