Improvements in Tins and like Vessels adapted for Closing or Sealing by Air Pressure.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Tins and like Vessels adapted for Closing or
Sealing by Air Pressure.
I, THOMAS RUDING DAVEY, of 11, Welsh Back, Bristol, Tobacco Manufacturer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to tins and like vessels which are adapted for closing by
exhausting, by means of an air pump or other appliance, the air contained therein
through an aperture which is sealed by a disc of india-rubber or by other means
after the air has been exhausted as is well known and understood.
According to this invention, a band of india-rubber or other suitable material
is glued or cemented to the inner face of the cover which latter has a channel
formed around it into which part of the said band is sunk. The band extends
inwards towards the middle of the cover to any desired extent. The body of
the tin is rounded at its upper edge by being bent or curled over inwards so as
to present a rounded lip all round the upper edge.
When the cover is placed in position on the tin, the rounded upper edge of the
latter bears against the aforesaid band and, as the air is exhausted from the tin,
the rounded edge becomes pressed upon the flexible or yielding cushion, thus con-
stituting an air-tight joint between the cover and the vessel."
By virtue of the rounded lip, the tin catches the band at a point away
from the edge of the band and is thus less liable to slip off the cushion or yielding
bed which the band constitutes.
Dated thin 11th day of November 1900
NICHOLAS WATTS,
Chartered Patent Agent, Bristol.
Improvements in Tins and like Vessels adapted for Closing or
Sealing by Air Pressure.
I, THOMAS RUDING DAVEY, of 11, Welsh Back, Bristol, Tobacco 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 follow-
ing statement:-
This invention relates to tins and like vessels which are designed to be closed
or sealed by exhausting the air contained therein through an aperture which is
sealed by a disc or wad of india-rubber, or by any suitable plug, after the air has
been exhausted. Such a method of closing tins and keeping them closed is well
known and understood. Such tins are commonly used for containing tobacco.
According to this invention, a band of india-rubber or other flexible, compressible
11

page_text: and otherwise suitable material is glued, cemented or otherwise made to adhere
to the inner face of the cover of the tin around which cover is formed a channel
into which part of the said band is sunk. The band is of any desired suitable
width. A further feature comprised in this invention consists in a rounded lip
on the body of the tin, formed by being curled over inwards. When the cover is
placed in position on the tin the rounded lip of the latter is in contact with the
aforesaid band and as the air is exhausted from the tin, the rounded lip becomes
pressed upon the flexible or yielding cushion, thus making air-tight contact there-
with.
Referring to the accompanying drawing, Fig. 1 thereon represents a view of
the inner face of a cover made, in accordance with my invention, for tins and
like vessels which are designed to be closed or sealed by exhausting the air con-
tained therein through an aperture which, after the air has been exhausted, is
sealed or plugged by a disc of india-rubber, or by any other suitable plug or seal.
Fig. 2 is a section of the cover.
Fig. 3 represents in section a tin made in accordance with this invention, that
is to say, with a rounded lip. Fig. 4 represents in section the tin closed.
To the inner face of the cover a is glued, cemented, or otherwise made to adhere,
a band of india-rubber or other flexible, compressible and otherwise suitable
material. The cover a is recessed from the inner face upwards in such manner
as to provide a groove or channel into which the band is, towards its outer edge,
received. The top of the tin c is curled or turned over to form a rounded lip d.
This rounded lip d is in contact with the band when the cover a is placed on the
vessel, as seen at Fig. 4, which represents the tin closed. As the vacuum increases
in the vessel, the contact between the band and the lip d becomes firmer, the lip
presses upon the band with increasing force and so the contact is made and kept
air-tight. At the bottom of the tin is the usual aperture e, closed, after exhaustion
of the air, by applying the usual kise f of india-rubber which is glued to the tin,
or by any other suitable seal or plug according to the usual practice.
The line of firmest bite of the lip d on the band b being inside or away from the
edge of the band, the said edge is not liable to slip within the line of bite.
Having now particularly described and ascertained the nature of this invention,
and in what manner the same is to be performed, I declare that what I claim is ;-
1. In tins and like vessels which are designed to be closed or sealed by extracting
the air contained therein, a channelled cover such as a carrying a band such as b
of india-rubber, or other flexible and otherwise suitable material, substantially as
hereinabove described with reference to the accompanying drawing.
2. In tins and like vessels which are designed to be closed or sealed by extracting
the air contained therein; an internally rounded lip such as d to the body of the
vessel, substantially as hereinabove described with reference to the accompanying
drawing.
3. In a tin or like vessel designed to be closed or sealed by extracting the air
contained therein, the hereinabove described improved closure, comprising the lid a
with internal annular channel or groove, the band b of india-rubber or other suit-
able packing material applied as set forth, to the lid, and the internally rounded
lip dof the vessel to be closed, the whole combined and arranged, substantially as
described, whereby, after exhaustion of the air from the vessel through a suitable
aperture, and closure of that aperture, the vessel will be hermetically closed, as
described.
01... f Novembon 1000
NICHOLAS WATTS,
Chartered Patent Agent, Bristol.