Improvements in and relating to Metal Canisters and Cases.
Year: 1897

page_text: Date of Application, 18th Dec., 1897
Complete Specification Left, 2nd Mar., 1898--Accepted, 17th Dec., 1898
PROVISIONAL SPECIFICATION.
Improvements in and relating to Metal Canisters and Cases.
I, GEORGE WISTON BAKER, 6, Acacia Grove, West Dulwich, S. London, S. E.,
Physician and Surgeon, do hereby declare the nature of this invention to be as
follows:-
-
This invention relates to metal canisters and cases especially of the kind in
which a wire contained therein or thereon, and on being pulled at one end,
cuts or forces its way through the substance of the rim of the lid or cover, at
such a point as to leave sufficient of the rim of the lid, after its being opened,
to act as a complete and efficient lid. I shall hereinafter refer to such a canister
or case as a "tin," the term that is usually used for receptacles containing
small quantities of preserved goods, such as meat fruit, condensed milk, and
the like. According to my invention, the rim of the lid, is cut from its lower
margin to a point which regulates the depth of the rim of the lid which is
required after the tin has been opened, and that this cut terminates in a small
hole of the same size as the gauge of the wire which is used in the opening.
The body of the tin is marked by a concavity or bead, as near to the upper
margin as may be considered necessary, and immediately below this concavity
or impress, is a convexity or bulging, both these markings extend around the
top part of the tin. A small piece of metal is punched out from the centre
of the concavity, this affords attachment to one end of the cutting wire, which
is turned to form a hook; the wire is then carried around the tiu in the con-
cavity or impress to the extent of half an inch past its insertion, the lid is then
placed in position by bringing the cut in the rim to such a position as to allow
the wire to pass between its cut surfaces to its more dilated part which has
heretofore been termed a small hole. The wire is cut and twisted to shape,
before placing in position. The lid is then soldered to the body of the tin, and
the cut in the rim is thoroughly flushed with solder.
My improvement consists in the effective method of arranging a wire in such
a position, as to cut the lid at such a point as to leave sufficient rim to the lid,
for it to act after the opening of the tin as a thoroughly efficient cover.
Dated this 17th day of December 1897

page_text: Improvements in and relating to Metal Canisters and Cases.
I, GEORGE WISTON BAKER, of 6, Acacia Grove, West Dulwich, London, 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:-
My present invention relates to metal canisters and cases of the kind in which
a wire contained in a groove in the canister, on being pulled at one end cuts its
way through the metal of the lid so as to open the canister. Heretofore such
cutting has been effected at the top of the lid, so that when cut, the lid merely
presents a flat disc that is useless for subsequently closing the canister.
According to my present invention I so arrange the cutting wire relatively
to the canister and lid that when the lid is cut through it still retains a cylin-
drical rim of sufficient depth to enable it to be fitted upon the canister as an
ordinary lid.
For this purpose I construct the parts as I will describe with reference to
the accompanying drawings, in which Fig. 1 shews a part sectional elevation
of the upper end of a canister and its lid; Fig. 2 shews the lid after separation
by the cutting wire; and Fig. 3 shews a section on line X X Fig. 1.
The canister A has formed on it near its upper edge, an inwardly bulged
circular groove a and below this an outwardly projecting sloping bead a¹; into
the groove a is introduced the cutting wire B, one end of which is bent into
hook shape and is hooked into a slit a² made in the groove a, the wire being
led right round the groove.
The lid C is made with a cylindrical rim of such a depth that when fitted
upon the canister A so as to cover the groove a and abut against the bead a
there is some depth of rim above the groove a. The edge of the lid has an oblique
slit c cut in it, extending to such a height that its end, which is formed with a
small hole is situated opposite the groove a and into this slit is then passed the
looped end of the wire B, the slit c being preferably placed in such a position
relatively to the slit a2 in the canister that the looped end of the wire is made
to somewhat overlap the hooked end as shewn at Fig. 3, so as to insure the
lid being completely cut through. The lower edge of the lid is then secured
to the canister A by soldering, and the slit c is also closed by solder, the lid
being made to fit tight on to the incline of the bead so as to prevent the solder
from running up into the groove a and fixing the wire. On pulling at the
looped end of the wire B for opening the canister the lid will be cut through
thereby at the point c¹, thus leaving the lid with a depth of rim as shewn at
Fig. 2 so that it can afterwards be used to effectually close the canister again.
Having now particularly described and ascertained the nature of this in-
vention and in what manner the same is to be performed, I declare that what
I claim is:-
...
1. The combination of a canister having an inward bulged circular groove
for containing the cutting wire, and a lid having a rim fitting over and beyond
the said groove and wire the rim of the lid being made of such a height above
the said groove, that when cut through by the wire, a sufficient amount of rim
will be left upon the lid for enabling it to be used as an efficient cover to the
canister, substantially as described.
2. The combination of a canister having an inward bulged circular groove
for containing the cutting wire, and an outward bulged bead with inclined

page_text: surface below such groove, and a lid fitting over the said groove and on to the
inclined surface of the bead, the rim of the lid being made of such a height
above the said groove that when cut through, a sufficient amount of rim will
be left upon the lid for enabling it to be used as an efficient cover to the canister,
substantially as described.