Improvements in or connected with Lever Lid Tins for Rendering same Air-tight.
Year: 1895

page_text: Date of Application, 31st Aug., 1895-Accepted, 12th Oct., 1895
COMPLETE SPECIFICATION.
Improvements in or connected with Lever Lid Tins for Rendering
same Air-tight.
I, WILLIAM WOOLNOUGH of 174, Sebert Road, Forest Gate, Essex, Tin Plate
Worker, 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 invention relates to improvements in or connected with lever lid tins, and
has for its object to render them perfectly air-tight, so as to allow petroleum,
oils, syrups and other liquids and substances to be carried in same, with perfect
safety.
In carrying my invention into practical effect, the tin and lid is constructed in
the usual and well known manner with the addition of a packing ring or washer of
any suitable material placed around and under the edge of the lid, which packing is
designed to come into contact with and be tightly pressed against the projecting or
raised portion of the top of the tin so that it may be slightly embedded within the
said packing when the lid is closed on to the tin.
When the lid is in the closed position, I then, by means of any suitable tool,
appliance or machine, form or press out the bottom of the lid so as to form a
bulged rib, ridge or burr all round the said bottom, which ridge rib or bulged
portion comes closely under the inwardly projecting circular flange of the tin so as
to hold the lid closely and tightly in position and prevent it from slipping up or
becoming loosened, until the lid is required to be removed, which is effected by
raising or prizing it up in the ordinary manner, either by means of any suitable
tool, coin or the like.
In order that my invention may be more fully understood I will now proceed to
describe same with reference to the accompanying drawings, in which
Fig. 1 is a sectional elevation of the top of a tin and lid, showing the lid
detached.
Fig. 2 is a similar view showing the lid in position and Fig. 3 shows the lid in
position with the bulged ridge or rib formed on same.
Fig. 4 is a sectional elevation of the top of the tin with the lid in position,
drawn to an enlarged scale, so as to more clearly illustrate the principle of this
invention.
Fig. 5 is a sectional elevation of the lid showing the washer or packing ring as
placed during the course of constructing the lid and Fig. 6 shows the completed
lid with the washer in position ready for use.
Like letters of reference indicate corresponding parts throughout the views.
According to my invention, the tint and lid are both constructed in the
ordinary and well known manner with the addition of a washer or packing ring w
of any suitable material placed around and under the circular edge or flange of
the lid and which is retained in position by bending over the edge a of same as
shown in Figs. 5 and 6.
The lid and tint being ready as shown in Fig. 1, the lid is pressed into the
tint in any suitable manner so as to force the washer w tightly and closely on to
the raised edge of the top t in order to render the lid air-tight, and then by means
of any suitable tool, appliance or machine, I form the ridge, rib or bulged portion
which comes tightly and closely under and against the inwardly projecting circular
flange, thus holding the lid in position and preventing it from shifting up and
becoming loose, and also stopping leakage.

page_text: The ridge, rib or bulged portion r is shown somewhat exaggerated in the
drawing in order that it may be seen more clearly, but it will only project
sufficiently to hold the lid tightly in position, at the same time allowing it to be
removed, when required, upon applying reasonable pressure to the under part of
the lid, and the amount of bulging or size of the rib or ridge, which may have to
be varied according to the uses for which the different kinds of tins are intended,
can be readily determined by experiment.
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 :-
1. The improvements in or connected with lever lid tins for rendering same
air-tight substantially as herein described and shown in the accompanying
drawings.
2. In lever lid tins the employment of a suitable packing ring such as w, in
combination with a rib, ridge or bulged portion such as r, formed when the lid is in
position by any suitable tool, appliance or machine, substantially as herein
described and shown and for the purposes specified.
Dated this 28th day of August 1895
F. G. CASSELL
(Of Cassell & Co.),
22, Glasshouse Street, Regent Street, London, W.,
Agent for the Applicant.