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Publication numberUS2550132 A
Publication typeGrant
Publication dateApr 24, 1951
Filing dateFeb 15, 1946
Priority dateFeb 15, 1946
Publication numberUS 2550132 A, US 2550132A, US-A-2550132, US2550132 A, US2550132A
InventorsWoods William E
Original AssigneeNat Organ Supply Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Self-sealing cap
US 2550132 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

April 24, 1951 w, WOODS 2,550,132

SELFQSEALING CAP Filed Feb. 15, 1946 INVENTOR. fia. 6.

Patented Apr. 24, 1951 OFFICE V SELF-SEALING CAP William E. Woods, Erie, Pa., assignor to National Organ Supply Company, Erie, Pa., a corpora tion of Pennsylvania Application February 15, 1946, Serial No. 647,941

1 For tubes containing tooth paste, shaving cream and the like there have been proposed self sealing caps made of rubber with a normally closed slit through which the material flows in ribbon form when the tube is squeezed. This invention vis intended to improve caps of this type by -making the caps of resilient flexible plastics which,

compared to rubber, are not stretchable, and by proportioning the walls of the cap so the slit closes with a wiping action from the outlet toward the inside of the cap as the pressure on the tube is released. The slit may terminate short of the outer end of the cap so the cap is completely sealed until the outer end is cut off. This permits the use of the same cap for materials of different viscosity, the caps being cut so as to have a shorter slit for the more viscous materials. Further objects and advantages appear in the specification and claims. V

In the drawing, Fig. 1 is a perspective view of a tube having a self sealing cap; Fig. 2 is a side view; Fig. 3 is a sectional view through the cap showing the cap in the sealed position; Fig. 4 is an end view; Fig. 5 is a sectional view through the cap showing the opening of the slit to release material from the tube; and Fig. 6 is an end view showing the opening of the slit.

'Referrin to the drawing, I indicates the conventional tube with an externally threaded outlet 2. In place of the conventional cap which must be removed and replaced With each use of material from the tube is a self sealing cap 3 having its lower end 4 pressed over and resiliently gripping the threads on the outlet 2. At the upper end of the cap is a flat nozzle 5 having a slit 6, the sides of which are normally closed by the inherent resilience of the cap and the outer end of which is closed by an integral section I of the cap. On the outer surface of the nozzle are ridges 8 which indicate lines along which the outer end of the cap may be cut off. Until the outer end of the tube is cut off, the contents of the tube are completely sealed. This is important in shipping and other handling of the tube before use of the contents is started. A plurality of ridges 8 are indicated. severing the cap at the outermost ridge is desirable for less viscous materials. For more viscous materials a greater part of the end of the cap is out 01?.

To secure progressive opening of the slit when the tube is squeezed, the walls of the slit decreases in rigidity from the inner end toward the outlet. In the construction shown, this is accomplished by stepping down the wall thickness so the walls of the slit are thinnest at the outer or discharge 1 Claim. (01.222490 end, and also by the shape of the walls. The walls of the cap at the inner end of the slit I, being of a more nearly circular shape at the inner end of the slit, offer a greater resistance to opening of the slit. At the inner end of the slit, the inside walls of the cap diverge, providing a wedgeshaped entrance 9. When the tube is squeezed, the fluid pressure acts on the diverging walls and exerts a greater spreading pressure, tending to open the slit. Since the materials customarily sold in tubes are viscous, the fluid pressureris greatest at the entrance to the slit and decreases as the material flows along the slit. The walls forming the sides of the slit are proportioned so that the opening of the slit is greatest at the inner end and progressively decreases toward the outer or discharge end, as clearly indicated in Fig. 5.

When the pressure on the tube is released, the inherent resilience of the cap causes contraction of the slit which progressively closes from the outer end toward the inner end with a wiping action keeping the surfaces of the slit clean. This makes possible a substantially clean closure of the outer end of the slit so that cakin of the material in the slit is prevented.

The cap is made of a thermoplastic material, such as poly-ethylene, vinylplastic, or materials which belong to the class known as elastomers. These plastics are flexible and resilient but are not stretchable in the sense of rubber or are stretchable to a limited extent compared to rubber. These materials also are not attacked by oils, acids, or alkalis and are therefore substantially unaffected by the usual materials sold in tubes. Another advantage of these materials is that the surfaces are much smoother than those possible with rubber and less resistance is therefore offered to the flow of material through the slit and upon closing of the slit a thinner film will remain on the surfaces. This initial advantage over rubber caps increases with use since the rubber surface becomes progressively rougher due to the chemical attack of the rubber and due to the building up of dried films of materials on the surfaces.

The slit 6 may be out after the cap is molded or it may be formed in the molding operation. Cutting produces a rougher surface but still a much smoother surface than can be produced with rubber. When the slit is cut, the closing pressure on the slit is greatest since no material is removed. It is also possible to form the slit in the molding operation by the use of a knife edge core thin enough so that the walls of the slit shrink into contact upon cooling of the cap. Molding the slit produces the smoothest wall surface but results in somewhat less closing pressure since some material is in effect removed to form the slit.

What I claim as new is:

A self sealing cap for collapsible tubes molded of resilient material having an elongated tip with a solid outer end and with a slit therein having sides normally closed into engagement with each other by the inherent resilience of the material and said slit extending from the inside of the cap toward and terminating short of the solid outer end of the tip whereby the cap is completely sealed until the outer end of the tip is cut off, the walls of the tip forming the sides of the slit decreasing 'instifiness toward the outer end whereby the sides of the slit close progressively into engagement with each other 4 from the outer end as pressure on the tube is released, and the tip being marked for cutting at a plurality of points inward from the outer end of the tip whereby the length of the slit remaining after cutting can be selected to correspond with the viscosity of the material in the tube.

WILLIAM E. WOODS.

REFERENCES CITED The following references are of'record in the file of this patent:

UNITED STATES PATENTS Number -Name Date 1,951,544 Burrell Mar. 20, 1934 1,998,847 Schiefer Apr. 23, 1935 2,176,513 Smith Oct. 1'7, 1939 2,188,191 Roos Jan. 23, 1940

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1951544 *Apr 11, 1932Mar 20, 1934Burrell Matthew M LSelf-sealing tube
US1998847 *Aug 2, 1934Apr 23, 1935Schiefer Lawrence RClosure for collapsible containers
US2176513 *Mar 20, 1937Oct 17, 1939Fredrick Smith WilliamResilient closure for containers
US2188191 *Feb 21, 1939Jan 23, 1940Roos Wendel VHermetically sealed automatic closure for collapsible tubes and the like
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2802607 *May 11, 1953Aug 13, 1957Kalmbach Jr PhillipDispensing cap for collapsible tubes
US2802608 *Oct 18, 1954Aug 13, 1957Joseph A HullSealed valve dispensing device
US2808967 *Feb 7, 1956Oct 8, 1957Miller Theodore AlbertValved flexible hollow article
US2861572 *Apr 9, 1957Nov 25, 1958Barnes Hind Lab IncMedicament dispenser
US2949215 *Mar 17, 1958Aug 16, 1960Alexander James WDispensing caps for collapsible containers
US2952861 *Jul 1, 1957Sep 20, 1960Reggio Frank PDispensing and applicator device
US2956710 *Dec 17, 1956Oct 18, 1960Morton Salt CoDisposable shaker packet
US2981449 *Oct 31, 1957Apr 25, 1961Rutland Fire Clay CompanyCaulking compound cartridge with improved spout
US3094124 *Jun 30, 1960Jun 18, 1963Davol Rubber CoArterial catheter
US3104787 *Sep 29, 1960Sep 24, 1963 Valve device comprising resilient
US3233798 *Aug 8, 1963Feb 8, 1966Lever Brothers LtdCaps with pouring spouts
US4124150 *Aug 18, 1975Nov 7, 1978Moss Norman WSelf-closing container outlet
US5071017 *Feb 15, 1991Dec 10, 1991Stuli IeneClosure cap construction with slitted flexible diaphragm
US5398853 *Jan 26, 1994Mar 21, 1995Latham; Peter A.Discharge nozzle
US5918783 *Jun 26, 1997Jul 6, 1999Courtaulds Packaging, Inc.Thermoplastic squeeze tube with self-sealing dispensing orifice
US6045004 *Mar 20, 1998Apr 4, 2000Aptargroup, Inc.Dispensing structure with dispensing valve and barrier penetrator
US7226230 *Dec 30, 2003Jun 5, 2007Raymond LiberatoreSpreader
US7314328Mar 26, 2004Jan 1, 2008Liberatore Raymond ASpreader
US7325994Jul 19, 2004Feb 5, 2008Liberatore Raymond ASpreader
US7465118Jun 6, 2008Dec 16, 2008Mack-Ray, Inc.Spreader apparatus, for use with dispensers
US7645085Dec 8, 2008Jan 12, 2010Mack-Ray, Inc.Spreader apparatus, for use with dispensers
US7824123May 12, 2009Nov 2, 2010Mack-Ray, Inc.Spreader apparatus, for use with dispensers
US8485728Dec 17, 2007Jul 16, 2013Kraft Foods Global, Inc.Resealable packaging
US8662780 *May 25, 2009Mar 4, 2014Lameplast S.P.A.Container for fluid products, particularly creams, ointments, pastes, lotions for medical, pharmaceutical or cosmetic use
US20050025560 *Dec 30, 2003Feb 3, 2005Raymond LiberatoreSpreader
US20050135869 *Jul 19, 2004Jun 23, 2005Liberatore Raymond A.Spreader
US20110082432 *May 25, 2009Apr 7, 2011Antonio FontanaContainer for fluid products, particularly creams, ointments, pastes, lotions for medical, pharmaceutical or cosmetic use
DE102009057415A1 *Dec 8, 2009Jun 9, 2011Ali VijdanContainer for foodstuffs, particularly for paste and highly viscous liquids, has partially elastically deformable container wall, dosing head consisting of dosing channel and slotted discharge opening
DE102009057415B4 *Dec 8, 2009Oct 10, 2013Ali VijdanBehälter für Lebensmittel
EP0162417A2 *May 15, 1985Nov 27, 1985Douwe Egberts Koninklijke Tabaksfabriek- Koffiebranderijen-Theehandel N.V.A disposable package for storing and transporting a liquid or viscous product
WO1996029252A1 *Mar 20, 1995Sep 26, 1996Peter A LathamDischarge nozzle
Classifications
U.S. Classification222/490, 222/541.2, 222/92
International ClassificationB65D47/04, B65D47/20
Cooperative ClassificationB65D47/2031
European ClassificationB65D47/20E2