Improvements in Sheet-metal Cans.
Year: 1896

page_text: Date of Application, 21st Dec., 1896-Accepted, 23rd Jan., 1897
COMPLETE SPECIFICATION.
Improvements in Sheet-metal Cans.
1, MAX AMS, of 372 Greenwich Street, New York City, County and State of
New York, United States of America, Merchant, 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 a sheet-metal can designed for packing food products,
and more particularly to an improved construction of the seam between the can-
body and the cover.
In the accompanying drawing,
Figure 1 is a perspective view of the cover; Fig. 2 a longitudinal section
thereof; Fig. 3 a similar section through the can-body.
Figs. 4, 5, 6, and 7, are sections through the joint, showing it in successive stages
of completion.
The letter a represents the body of a sheet-metal can, flanged at its upper end,
as at a'. The sheet-metal cover b, is countersunk or depressed at its center, so as
to be provided with an upright neck or shoulder b', which is adapted to fit snugly
within the opening of the can-body. Around this neck the cover is provided
with the laterally extending flange b, which should be considerably wider than the
flange a. After the cover has been pressed into the above described form its
neck 6', and flange, are covered with an air excluding adhesive body c, that
adheres to the cover and coustitutes in effect a packing. This coating consists
of a layer of rubber cement d, Fig. 1, which may be applied to the parts b', b,
with a brush, and of a thin layer of asbestos pulp e, which forms a film on the
surface of the cement.
When the can is to be sealed, the cover, prepared as described, is placed upon
the chime so that its countersunk central section projects into the can-body, Fig. 4.
The projecting part of the flange 63, is next crimped downward, Fig. 5, then
inward, Fig. 6, and then the two flanges are jointly bent downward to produce a
lap-joint, Fig. 7, when the operation is completed.
It will be seen that with my iniprovement a perfectly tight joint is produced
without the use of solder or washers. The packing or sealing body does not only
extend into every portion of the lap-joint, but it also extends between the inner
surface of the can-body and the neck 6, of the cover. To this feature I attach
considerable importance, because it insures a tight seating of the cover and a tight
packing independent of the lap-joint.
The rubber in my improved packing forms the air-excluding body proper, while
the asbestos forms a coating or skin upon the surface of the same which greatly
increases the tightness of the joint. Thus a packing of superior merit is produced,
and moreover, the resistance offered by the ordinary washers to the crimping
operation and the consequent frequent imperfections of the seam are entirely
avoided.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
TH
bination
a cheat matal con with e Bonged and countersunk come

page_text: and with an adhesive coating secured to the cover, and consisting of rubber
cement and an asbestos film, substantially as and for the purpose specified.
Dated this 21st day of December 1896.
ALLISON BROS.,
Agents for the Applicant.