Improvements in Closing Devices for Preserve Jars or other Receptacles.
Year: 1893

page_text: Date of Application, 4th Feb., 1893-Accepted, 11th Mar., 1893
COMPLETE SPECIFICATION.
Improvements in Closing Devices for Preserve Jars or
other Receptacles.
We FRANZ GUILLEAUME Manufacturer and EWALD GOLTSTEIN Engineer
both of Bonn in the Kingdom of Prussia German Empire 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 improvements in the stopper or closure for preserve jars
and other like receptacles such as is described in the Specification of our application
for Letters Patent No. 8004 dated 25th April 1892 and the object of our present
invention is to obtain an air tight closure with less pressure of the spring closing
device.
The improvements consist mainly in the peculiar form of the internally acting
part of the cover and in the arrangement and construction of the spring as herein-
after explained.
Figure 1 of the accompanying drawings represents in section a portion of the
mouth of a jar provided with means for closing the same according to this
invention.
Figure 2 illustrates in elevation (drawn to a smaller scale) the upper part of a jar
provided with the improved closing arrangement.
The jar or receptacle being constructed with a taper or conical upper part b
Figure 1 is combined with an internal acting part of the cover a which is formed
in such a manner as to present an inclined shoulder a¹ a² arranged tangentially to
the packing ring d and is provided with a vertical or cylindrical lower part or
extension a a³ the lower edge of which when the cover is pressed down fits closely
against the conical part 6 of the jar as is represented by dotted lines in Figure 1
which also shews the form which the packing ring d assumes when the cover is
depressed.
Figure 2 represents the cover in the closed or lowered position and shews how
the packing material is completely enclosed or protected from external influence.
The many-armed or branching wire-spring described in our aforesaid previous
Specification may be replaced by a flat or blade spring cl preferably constructed
with two arms or branches and is applied to the centre of the cover a in order to
retain it in its proper position.
With the same object a depression is formed in the centre of the cover as
indicated in Fig. 2 which engages with a projection on the central inwardly curved
portion of the spring.
The said recess and projection may be of any suitable form and the projection
may be made on the cover and the recess in the spring if preferred.
When the spring c¹ is placed in position its projecting extremities e² by which the
spring is held in the operation of putting on and taking off the cover, are caused
to spring apart and slip over the edge of the conical enlargement 6 so as to
engage with the under side thereof whilst the central part is applied with gentle
pressure against the cover being retained in its central position as hereinbefore
described.
The inclined or conical part a' a² of the cover being in contact with the packing d
along one line only the aforesaid gentle pressure of the spring is sufficient to make
a perfectly air tight joint. By heating the closed receptacle pressure is established
in the interior by the expansion of the contents and this pressure without requiring
to be greatly in excess of the external pressure is enabled to slightly lift the cover
so as to allow the gases to escape. On cooling the contents of the receptacle the
joint is made air tight by the action of the spring in the first place and on further

page_text: cooling a vacuum is created in the jar and the atmospheric pressure forces down
the cover a on to the receptacle with sufficient power to compress the packing
material which is retained in position laterally by the lower part a? a³ the edge a³
being finally forced down into contact with the conical part of the mouth of the
receptacle.
The flat spring cl which may if preferred be replaced by a wire spring such as
that described in our aforesaid Specification, simply serves to apply pressure to the
cover in the first instance or until the vacuum is formed after which it may be
removed without, endangering the tightness of the closure.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
A closure for preserve jars and like receptacles in which the inner part of the
cover is formed with a shoulder a¹ a² applied to the packing material in a tangential
direction and having an extension a² a³ applied at a³ against the conical rim
under the action of a vacuum produced in the interior of the vessel substantially.
as described.
Dated the 4th day of February 1893.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents. .