Improvements relating to Screw Caps or Covers for Collapsible Tubes.
Year: 1890

page_text: Date of Application, 10th Dec., 1890
Complete Specification Left, 11th Apr., 1891-Accepted, 23rd May, 1891
PROVISIONAL SPECIFICATION.
Improvements relating to Screw Caps or Covers for Collapsible
Tubes.
I, WALTER FREDERIC SANDERS, of the firm of H. G. Sanders & Son, Victoria
Works, Victoria Gardens, Ladbroke Road, in the County of Middlesex, Collapsible-
tube Manufacturer, do hereby declare the nature of this invention to be as follows:-
My invention relates to screw caps or covers for collapsible tubes.
Such covers are usually provided internally with a small washer of cork vulcanite
or other suitable material which washer when the cap or cover is in place presses
upon the orifice of the collapsible tube and serves more or less effectually to
hermetically close the same. It frequently happens however when the screw caps
are removed this washer instead of remaining securely in position in the said cap
or cover and being removed therewith, is found adhering to the upper part of the
tube, and has to be removed therefrom before the contents of the same can be
ejected.
Now my present invention is designed to avoid this inconvenience and to
provide suitable means for effectually securing the said washer in the cap or cover.
By my said invention I also provide for rendering the washer, when formed of
porous material, more impervious to air or other fluids and more suitable for the
purpose for which it is intended.
In carrying my invention into practice I form in the inner end of the said cap
or cover preferably during the manufacture of the same, a small projection or pin
situated in the centre thereof. In inserting the said washer in its place I press the
same onto the said projection or pin so that the latter passes through and projects
beyond the said washer. Then by means of a suitable tool or stamp, I
press down
the projecting end of the pin so as to firmly rivet the washer in position in the
screw cap or cover.
It is obvious that I may in some instances provide two or more pins or pro-
jections for the purpose of rivetting the washer in its place, in the manner herein-
before described. In employing washers formed of cork or other similar porous
material I find that the efficiency thereof is considerably impaired by reason of
the air permeating through the same and affecting the contents of the tube. I
find it very advantageous therefore to saturate or soak the said washers or the
cork or other porous material from which they are formed in a bath of melted
paraffin wax or other suitable substance which when cool and solidified will
effectually close the interstices of the material. I thus provide at a very small
cost for rendering the washer impervious or practically impervious to air.
Dated this 10th day of Decembar 1800
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to Screw Caps or Covers for Collapsible
Tubes.
I, WALTER FREDERIC SANDERS, of the firm of H. G. Sanders & Son, Victoria
Works, Victoria Gardens, Ladbroke Road, in the County of Middlesex, 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:—
M
Rane for callensible tubes

page_text: Such covers are usually provided internally with a small washer of cork or other
suitable material, which, when the cap or cover is in place, presses upon the edges
of the orifice of the collapsible tube, and serves to hermetically close the same.
Such washers have heretofore been simply inserted in the screw-cap, and con-
sequently it frequently happens that, when the screw-cap is removed, the washer,
instead of remaining securely in position in the said cap or cover and being
removed therewith, is found adhering to the upper part of the tube, and has to be
separated from the tube before the contents of the same can be ejected, and to be
re-inserted in the screw-cap before the latter can be again used for closing the
tube.
Attempts have been made to use washers formed of cork saturated with paraffin-
wax or similar material in order to more effectually ensure the exclusion of the air
from the contents of the tube. These attempts, however, have not hitherto led to
satisfactory results, by reason of the fact that the paraffin-wax increases the
tendency of the washer to adhere to the top of the collapsible tube.
Now, by my present invention, I obviate the above mentioned inconvenience,
and I provide for enabling paraffin-wax or similar material to be used, to render
the cork more impervious to air and more suitable for tightly closing the tube,
whilst preventing the removal of the cap from the tube without the washer.
In carrying my said invention into practice, I form on the interior of the top
or closed end of the screw-cap, preferably during the manufacture of the said cap,
A small projection or pin situated in the centre thereof, and I form a corresponding
hole in the cork or other washer. I then press the said washer on to the said
projection or pin so that the latter passes through and projects a short distance
beyond the said washer, and, by means of a suitable tool or implement, I rivet or
clinch the projecting end of the said pin over the washer, so as to firmly secure
the latter in position in the screw-cap.
When the washer is formed of cork or similar porous material, I prefer to
saturate or soak the said washer, or the cork or other porous material from which
the same is to be formed, in a bath of melted paraffin-wax or other suitable
substance, which, when cooled and solidified, will effectually fill up the pores or
interstices of the cork or similar material. I thus provide at a very small cost
for rendering the washer impervious, or practically impervious to air.
It is evident that, when the washer is secured as above described, any tendency
of the same to remain adhering to the tube when the cap is removed, is effectually
overcome, and the full advantage of the employment of a washer saturated with
paraffin-wax or similar material, without the disadvantages thereof, is thus secured.
In the accompanying drawing, I have shown, drawn to an enlarged scale, a
screw-cap made in accordance with my said invention.
Figure 1 is a vertical central section of the said screw-cap.
Figure 2 is a sectional elevation, showing a portion of a collapsible tube with
the screw-cap thereon, and illustrating a slight modification of my invention.
The screw-cap A is provided, as shown, with an internal axial pin or projection B
formed integrally therewith in the process of stamping. C is a washer of cork or
other suitable material which is passed over the projection B and fits tightly into
the cap or cover A. The said washer is secured in place by rivetting or clinching
the extremity of the pin B over the said washer, either by means of a flat-ended
punch, or by means of a pointed punch, whereby a V-shaped or conical cavity or
indentation is formed in the extremity of the said pin, as shown in Figure 2,
thus causing the metal to expand and press tightly against the material of the
washer C.
It is obvious that I may, in some instances, provide two or more pins or projec-
tions for the purpose above specified and that, instead of the axial pin or projection
formed integrally with the screw-cap, I may use a separate pin or rivet passed
through the said cap. It is obvious, moreover, that the cork or similar material
may be used without the paraffin-wax; and that vulcanized fibre, leather or other
suitable material may be used in the place of cork.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I wish it understood that
I claim -
A screw-cap for a collapsible tube, having a washer or disc of cork or other
suitable material secured thereto by means of a pin or rivet, substantially as, and
for the purpose, above specified.
d this 11th day of April 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.