Improvements in Air Tight Cans and Covers therefor.
Year: 1892

page_text: Date of Application, 1st Oct., 1892-Accepted, 26th Nov., 1892
COMPLETE SPECIFICATION.
Improvements in Air Tight Cans and Covers therefor.
I, ALBERT SCHMITZ, of Wiesenstrasse, Elberfeld, Germany, 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:―
The improvement in air tight cans or canisters and the covers therefor, described
herein with reference to the accompanying drawings, are intended to so adapt the
parts that they may be readily fitted together by hand pressure and be air tight.
Without employing soldering, or other special means than herein described, covers
may be hermetically fitted to corresponding openings of the can, and removed
therefrom, by hand, without material injury to any of the parts, and without a
specially constructed tool.
In the drawings, Fig. 1 is a sectional elevation of the cover of a circular tin can
or canister A, the cover A being of a disc form with an upturned and outwardly
bevelled flange in two stages, with a small square fillet between them, and an outer
part of the flange which lays horizontally or approximately so, like the rim of a
plate above its depressed flat portion. The two bevelled or conically formed
flutings of the cover, with the intermediate fillet, are adapted to receive an india-
rubber ring A' of the sectional form shown, and to form a seat or abutment therefor,
as shown in the enlarged detail section Fig. 4. The slight curve of the lower stage
of the bevel is intended to give a slight spring to the cover when it is placed upon
the can B.
The mouth of the can B is similarly formed with a flat horizontal rim, and one
bevel or cone B', inclining inwards from the said rim, as shown in the section Fig. 2
and in the enlarged detail section Fig. 5. In diameter, the canister bevel is
slightly larger than the corresponding portion of the cover and just sufficient to
admit the dished portion of the cover. The angle of the bevel B' is almost
parallel with that of the corresponding bevel of A, but with an allowance for com-
pressing the ring A' between, and the bottom of the bevel B' slightly projects as a
nose over the inner wall of the can B. The cover is pushed on by hand, so that
the rubber ring A' forms a good seating upon the bevel B' all round its circum-
ference, and makes an air tight joint (as shown in the section Fig. 3) by the spring
action between A and B. The cover can be pulled off by hand by slightly
separating the horizontal flanges or rims A and B', without difficulty.
The cans may be used for preserves and other articles as desired.
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 I
claim is :-
The herein described air tight cover for cans consisting of a recessed disc with
an upturned and outwardly bevelled flange in two stages with an intermediate fillet,
combined with an indiarubber ring of the section shown seated beneath the said
bevelled flange, and a can whose mouth is correspondingly formed with a single
bevel and proportioned to receive and form an air tight seat for the said ring,
substantially as shown and described with reference to the Figures 1 to 6.
Dated this lot dan of October 1805
FAIRFAX & WETTER,
433, Strand, London, Agents for the Applicant.