AN IMPROVED SCREW STOPPER, FOR BOTTLES, JARS, AND OTHER HOLLOWS.
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by John Jackson at the Office of the
Commissioners of Patents on the 20th June 1883.
JOHN. JACKSON, the younger. [Engineer.] 51. Lorn Road Brixton. [London.] S.W.
AN IMPROVED SCREW STOPPER, FOR BOTTLES, JARS, AND OTHER HOLLOWS.
My invention relates to the formation of an improved screw, stopper, for Bottles,
Jars, and other Hollows.
The objects of my invention are the production of cheap, earthenware. or glass
(external or internal) screw stoppers, that possess the advantages of a fine thread,
though the operation of stoppering, be effected as quickly as by a very coarse
thread. That the formation economises the material used, gives the stopper a
neat appearance, and prevents its operating in any manner, but in the way
intended. I form external and internal screw stoppers for Bottles, Jars, and other
Hollows, in the following manner. An internal stopper and Bottle I form by
cutting a thread, in the mouth of the bottle, so that the thread stands out on the
surface. I then cut three fourths (more or less) of this thread away. level with the
surface, leaving the oblong fourth remaining. The stopper I form as a screwed
plug, and I cut away a portion of the thread, corresponding with the remaining
projecting piece in the mouth of the bottle, The lower part, and left hand side of the
remaining thread I block up. Round the upper part of this screwed plug, I form
a collar, and under this collar, I place a cork or suitable washer; Thus when the
plug is inserted in the mouth of the bottle, the projecting thread falls into the cut
away part, when a slight turn locks one thread into the other, and draws the
washer down on the mouth of the bottle, and it is stoppered. A slight turn the
reverse way and the threads return into the cut away part, when the screwed plug
can be lifted out of the mouth of the bottle. The blocking or filling up of the thread
prevents the stopper being operated in any way, but the way intended. External
Screw stoppers for Jars, and other Hollows, I form in the following manner.
the exterior of the mouth of the jar, I form a projecting flat rim, I cut two vertical
gaps, or recesses (each about one eight of the circumference of the jar) opposite
each other and level with the surface of the jar, on each of the two remaining
portions of the projecting rim, I strike three (more or less) threads, so that a
border, or margin at the left hand side, and along the lower, and upper part will
be formed, which protects the thread, and prevents the stopper from being operated
On

page_text: in any way but in the way intended. The stopper for the Jar, I form as a cap,
On the inner side of the rim of this cap, I form two projecting picces, opposite
each other, and corresponding in shape with the vertical gaps, or recesses cut out of
the rim of the jar; on these projecting pieces I strike three (more or less) threads,
but I do not leave any border or margin in doing so. I insert à cork or suitable pad
in the top of the cap. Thus when the cap is placed on the jar, the projecting
screwed portions fall into the vertical gaps or recesses, cut out of the rim of the
jar. In this position, a slight turn of the cap locks one thread into the other,
which compresses the cork pad on the mouth of the jar and stoppers it, A reverse
turn of the cap places its screwed portion in the gaps, when it can be lifted off and
thus the jar is unstoppered. It is obvious that this stopper can be modified to suit
_different vessels.