Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2795350 A
Publication typeGrant
Publication dateJun 11, 1957
Filing dateDec 2, 1953
Priority dateDec 2, 1953
Publication numberUS 2795350 A, US 2795350A, US-A-2795350, US2795350 A, US2795350A
InventorsLapin Zeverly L
Original AssigneeDev Res Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Explosion-proof low-pressure containers
US 2795350 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

June 11, 1957 z. LAPIN 2,795,350

EXPLOSION-PROOF LOW-PRESSURE com'umzns Filed Dec. 2. 1953 u\t -z INVENTOR. ZEVERLY L. LAPIN BY 7 W $4,, ATTORNEY United States Patent EXPLOSION-PROOF LOW-PRESSURE CONTAINERS Zeverly L. Lapin, St. Louis County, Mo., assignor to Development Research, Inc., St. Louis, Mo., a corporation of Missouri Application December 2, 1953, Serial No. 395,687

1 Claim. (Cl. 220-44) This invention pertains to improvements in low-pressure containers, and in particular to an improvement to make such containers explosion-proof.

Low-pressure double-seamed containers are now widely used for packaging and dispensing fluids and gases as used in such products as aerosols, shaving lathers, and food toppings. For the commercial success of such products, it is important that they should be so packaged as to be suited for transport by all convenient and usual means. However, prior to the present invention, it has not been possible to ship such containers packed with fluids and gases by parcel post. Mailing regulations forbid the transport by parcel post of containers which, if subjected to heat, as in a fire, would present a danger of explosion.

Objects of the present invention include: The provision of a simple container whose bottom and side wall are so joined that they will not be separated from each other despite increases of pressure within the container due to externally applied heat; the provision of a feature which safeties the container bottom to the side wall while the pressure in the container permanently distorts the bottom and then escapes from it; and the achievement of the other objects hereof without substantial additional manufacturing expense.

In the accompanying drawings:

Figure 1 is a perspective view partly from below of a low-pressure container embodying the present invention.

Figure 2 is a fragmentary view taken along line 2-2 of Figure 1.

Figure 3 is a perspective view similar to Figure l of the lower portion of such container shown with the bottom everted.

Figure 4 is a fragmentary view taken along line 4-4 of Figure 3.

The container of the present invention is of the singleuse type such as the container generally designated a, formed of light gauge metal and having a tubular side wall 1 whose upper portion is formed inwardly to a mouth 2 into which may be sealedly spun a top closure 3. Any suitable dispensing valve, such as the valve generally designated b may be sealedly mounted in such top closure 3.

The container designated a includes a bottom which is generally designated 4, having a concave center portion 5, an annular band portion 6 which is presented sealedly against and within the lower margin 7 of the side wall 1, and an outer bottom margin 8 which is bent back sharply from the annular band portion 6 around the lower margin 7 of the side wall 1. The sharp bend so made forms a bent-back lower rim 9 upon which the container normally rests. The edges of the lower margin 7 of the side wall 1 and the outer bottom margin 8 are spun together in a spun seam 10, shown in Figure 2.

It has been found that if heat is applied to such a container, filled with substances such as soap and Freon gas under pressures of the order of 50 to 125 pounds per square inch, more or less, the increase in pressure due to the application of heat tends to cause an eversion of the 2 ,795,350 Patented June 11, 1957 concave center portion 5 and annular band portion 6 of the bottom 4. Such an eversion substantially increases the volume of the container and efiects a corresponding reduction in pressure. However, if the application of heat is continued, the bottom 4 will be forced outward from the side wall 1, the spun seam 10 being bent open violently and the bottom 4 being exploded from the container with force and suddenness.

Inasmuch as the bottom 4 is formed of a thin sheet of metal, explosion of the container presents a serious danger of injury to persons who may be in the vicinity. For this reason, such containers not embodying the present invention may not be shipped through the mails.

I overcome this serious deficiency by providing a nick or cut 11 which preferably penetrates only part way through the material and the bent-back lower rim 9 of the bottom 4. Such nick or cut 11 may be imparted to the rim 9 in a variety of ways, as by a radial shallow saw cut, or a simple impact tool. It is apparent from Figure 2 that the side wall 1 is left intact in the region of its lower margin 7 and the seal of the annular band portion 6 against the inner surface of the lower margin 7 of the side wall 1 is in no way disturbed by such nick or cut 11. Therefore, in normal use the container a functions precisely as if the nick or cut 11 was not present.

In the event of fire or other cause tending to increase greatly the pressure within the container a, on the eversion of the concave center portion 5 and annular band portion 6 of the bottom 4, as shown in Figures 3 and 4, the bent back lower rim 9 is caused to be opened and substantially straightened, as shown in Figure 4. This sudden opening and flexing of the bent-back lower rim 9 cracks open the portion thereof which has been weakened by the nick or cut 11, opening said nick or cut 11 to form a pressureventing orifice 12 which penetrates the bottom 4 and has a length at least equal to the developed length of the nick or cut 11 on the inside, bottom, and outside of the bentback lower rim 9. The length of the orifice 12 tends to be increased by the flexure accompanying straightening of the rim 9 and by the intense pressures exerted in the process.

The eversion of the concave center portion 5 and annular band portion 6 of the bottom 4 immediately lowers the pressure within the container a; and with the opening of the nick or cut 11 to form the orifice 12, the container contents are permitted to escape and the pressure lowered to atmospheric pressure.

As is apparent from Figure 4, the change in configuration partly loosens the spun seam 10; but the edges of the bottom 4 and side wall 1 remain in the overlapping relationship shown in Figure 4, so as to safety the bottom 4 to the side wall 1. The container is of course rendered unfit for further use, but nevertheless presents no danger of explosion. Consequently, the purposes of the present invention are achieved without any additional structural components or assembly problems, and without any substantial increase in expense over the manufacturing costs on containers not provided with this improvement.

It being immaterial whether the closure of the side wall to be vented by the nick or cut 11 is the top or the bottom wall, the part referred to in the specification as the bottom 4 is referred to in the claim merely as a sheet metal container end closure.

Other embodiments of the inventive principles herein disclosed will be apparent to those skilled in the art. Accordingly, the present invention is to be considered as coextensive with the inventive principles herein disclosed.

I claim:

An explosiveproof pressure container, comprising a sheet metal tubular side-wall, a sheet metal end closure having an outer edge portion joined to the side-wall in a seam spun outward of the side-wall, further having a portion adjacent the seam whose inner surface is normally presented sealedly against and in surface contact with the inner surface of the end margin of the side wall, and a nick between the sealedlypresented portion and the outer edge portion, whereby, on generation of excessive pressure within the container, the center portion of the container end closure everts, bending the sealedly-presented portion away from the side wall and causing the nick to vent the pressure within the container, the outer edge portion being retained in the seam to the side-wall, the nick as initially made being only partly through the sheet material of the container end closure, and being opened into a vent by the bending attendant to such eversion.

References Cited in the file of this patent UNITED STATES PATENTS

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1577974 *Sep 5, 1924Mar 23, 1926Protane CorpTank
US2094600 *Jan 24, 1935Oct 5, 1937American Can CoContainer
US2174437 *Sep 21, 1936Sep 26, 1939Sprague Specialties CoElectrolytic device
US2336490 *Jul 25, 1940Dec 14, 1943Lo Vico RosarioPreset pressure can for frozen food or the like
US2367300 *Apr 27, 1942Jan 16, 1945Crown Cork & Seal CoMetal container
US2387353 *May 17, 1943Oct 23, 1945Gwynne RaymondSafety device for pressure vessels
US2455737 *Jul 29, 1944Dec 7, 1948Continentai Can Company IncMethod of attaching metal closures to containers
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3298532 *Apr 11, 1966Jan 17, 1967Carl WilckeDevice for storing articles
US3405838 *Sep 12, 1967Oct 15, 1968Du PontPressure vessel venting means
US3690500 *Nov 2, 1970Sep 12, 1972Applic Gaz SaSpherical containers for pressurized fluids
US3731838 *Apr 8, 1971May 8, 1973American Can CoContainer end wall construction
US3786967 *Jun 8, 1972Jan 22, 1974American Can CoPressure relief system for an aerosol container
US3814277 *May 18, 1972Jun 4, 1974American Can CoReclosable can
US3831822 *Mar 22, 1973Aug 27, 1974Nat Can CorpSafety aerosol can
US3850339 *May 7, 1973Nov 26, 1974American Can CoTriple score pressure relief system for an aerosol container
US4241844 *Jun 25, 1976Dec 30, 1980Aluminium Suisse S.A.Aerosol dispensing and similar metal cans, and process for the production thereof
US4513874 *Jan 25, 1984Apr 30, 1985Sexton Can Company, Inc.Pressure relief device for internally pressurized fluid container
US4580690 *Apr 11, 1985Apr 8, 1986Sexton Can Company, Inc.Coinless pressure relief device
US4708036 *Jun 10, 1985Nov 24, 1987Haskel, Inc.Stud tensioning apparatus
US4721224 *Dec 31, 1986Jan 26, 1988Nittoseiki Kabushiki KaishaPressure vessel having pressure releasing mechanism
US4989752 *Feb 18, 1987Feb 5, 1991Monsanto CompanyFrangible roof joint for storage tanks
US5121858 *Sep 7, 1990Jun 16, 1992Chong Wun CPressure relief system
US5249701 *May 15, 1992Oct 5, 1993Ray J. Van ThyneAerosol container with pressure release structure
US5704513 *Jul 25, 1995Jan 6, 1998Dispensing Containers CorporationThin walled cover for aerosol container and method of making same
US5865337 *Jun 26, 1997Feb 2, 1999Dispensing Containers CorporationThin walled cover for aerosol container and method of making same
US6830419Nov 20, 2000Dec 14, 2004Alfons Haar Inc.Aerosol can ends
US7066702Dec 6, 2004Jun 27, 2006Alfons Haar, Inc.Aerosol can ends
US7222757Aug 24, 2004May 29, 2007Illinois Tool Works Inc.Pressure relief device for aerosol can
US7621166Apr 4, 2007Nov 24, 2009Illinois Tool Works Inc.Die components for making pressure relief devices
US7971759 *Aug 20, 2008Jul 5, 2011Ds Containers, Inc.Aerosol container with pressure relief mechanism
DE1113287B *Sep 24, 1957Aug 31, 1961Pfrimmer & Co JBehaelter fuer medizinische Fluessigkeiten
DE2230333A1 *Jun 21, 1972Dec 28, 1972 Title not available
DE3120375A1 *May 22, 1981Jun 16, 1982Sexton Can Co IncUeberdrucksicherung fuer fluessigkeits-druckbehaelter
WO1997005022A2 *Jul 22, 1996Feb 13, 1997Dispensing Containers CorpThin walled cover for aerosol container
WO2002040193A2 *Nov 15, 2001May 23, 2002Alfons Haar IncAerosol can ends
WO2006016679A1Aug 8, 2005Feb 16, 2006Daiwa Can Co LtdCan container
Classifications
U.S. Classification220/203.8, 220/619, 220/89.2
International ClassificationB65D83/14
Cooperative ClassificationB65D83/70
European ClassificationB65D83/70