Improvements in Stopping Preserve and other Jars.
Year: 1898

page_text: Date of Application, 5th July, 1898-Accepted, 13th Aug., 1898
COMPLETE SPECIFICATION.
Improvements in Stopping Preserve and other Jars.
I, ALBERT LEGRAND, of Manchester, County of Hillsborough, and State of New
Hampshire, United States of America, Clerk, 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 self-sealing preserve-jars. The object of the invention
being to provide a cap or cover which will perfectly seal the contents of the jar
from the admission of air, and one which is adapted for repeated use.
The cover of any self-sealing jar requires to be vented before it can be removed
for the purpose of emptying the jar of its contents, and the form of cover
commonly used upon such jars is made of thin material as it has to be punctured
to allow the air to escape before it can be removed, and by reason of this puncture
the cover is rendered unfit for future use.
My improvements consist essentially in providing a cover for preserve-jars with
a small opening or threaded air vent which is fitted with a threaded cap and a
rubber gasket to render it air tight. The form of the cover as well as the seat
for the same in the jar is also comprised in my invention, as will be fully set
forth in following specification and claims, and clearly illustrated in the accom-
panying drawings, of which-
Figure 1, is a vertical section showing the top of a preserve-jar having my
improved cover applied;
Figure 2, being a plan view of the same.
A, represents the jar which may be of any form and similar to other jars except
that its opening is made interiorly flaring or inclining for half an inch more or
less, as seen at a, for the reception of my improved cover, preferably spun,
stamped, or otherwise formed from sheet metal, or light plate metal and which
consists of a disk B, having an upturned flange or rim b, formed on an angle
corresponding with the angle of its seat a, in the top of the jar. The disk B
is provided with a threaded air vent b' to which is threaded a cap b², and said
cover may also be provided with a handle-piece as shown at 63, the same being a
metal bar firmly secured to the upper edge of the rim b, preferably at diametric-
ally opposite points. A rubber band or gasket C is placed upon the rim b of said
cover B, and a gasket D is placed in the top of the threaded cap 2 to render
cover and cap perfectly air tight. To open a jar fitted with my improved cover
it is only necessary to unscrew said cap, when the cover may be removed from
its seat in the inclined top of said jar by means of the handle bar 63, and be again
ready for future use.
It will be observed that when the jar has been filled with preserves or the like,
at a high temperature, the cover is placed over the mouth and the jar is cooled.
This may be accomplished by allowing it to stand, or water may be poured
into the receptacle-shaped cover.
The cooling of the contents of the jar will, in an obvious manner, produce
variant pressures upon the upper and lower side of the cover and the external

page_text: pressure will force the latter securely into place. When it is desired to remove
the cover, the vent cap is unscrewed and an equalization of air pressure above
and below the cover is accomplished. I have found in practice however, that
the cover will have become so tightly wedged into the neck of the jar, by reason
of the yielding of the flange or rim b, and the rubber gasket, that its removal is
made difficult. I have therefore provided the handle which being secured at its
opposite ends to the upper edge of the rim or flange will, when pulled upward,
cause said flange to spring slightly and relieve the tight connection between the
cover and jar, and thereby facilitate the removal of the former.
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
The combination with a jar having a flaring mouth, of a cover composed of
a disc and an annular upwardly and outwardly inclined flange surrounded by a
gasket, a vent in said cover, a screw cap designed to close the same, and a
handle secured at its opposite ends to the upper edge of the flange whereby said
flange may be sprung slightly to facilitate the removal of the cover from the
jar, substantially as specified.
D
151 1
P T
1000