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Publication numberUS3680743 A
Publication typeGrant
Publication dateAug 1, 1972
Filing dateApr 10, 1970
Priority dateApr 10, 1970
Publication numberUS 3680743 A, US 3680743A, US-A-3680743, US3680743 A, US3680743A
InventorsReinnagel Richard E
Original AssigneeCornell Aeronautical Labor Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Safety venting apparatus combined with an aerosol container
US 3680743 A
Abstract
An aerosol container combined with apparatus to relieve excessive interior pressures in the form of a fluted stab located adjacent a pressure deformable portion of the container such that upon deformation thereof the stab will make contact and pierce an opening therethrough.
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Description  (OCR text may contain errors)

United States Patent Reinnagel [451 Aug. 1, 1972 [54] SAFETY VENTING APPARATUS COMBINED WITH AN AEROSOL CONTAINER [72] Inventor: Richard E. Reinnagel, Elma, NY.

[73] Assignee: Cornell Aeronautical Laboratory, Inc., Bufialo, NY.

[22] Filed: April 10, 1970 [21] Appl. No.: 27,306

521 US. Cl .Q222/391 [51] Int. Cl. ..B65d 83/14 [58] Field of Search...220/89 A; 222/397, 5, 80, 396, 222/4021 [56] References Cited UNITED STATES PATENTS 2,336,490 12/1943 Vico ..220/89 A 3,241,713 3/1966 Clapp et a1 ..222/396 X 3,074,602 1/ 1963 Shillady et a1 ..220/89 A X 3,294,277 12/ 1966 Wood ..220/89 A 3,155,271 11/1964 Summers et al ..220/89 A 3,145,874 8/1964 Webb ..220/89 A Primary Examiner-Stanley H. Tollberg Attorney-Allen J. Jaffe [57] ABSTRACT An aerosol container combined with apparatus to relieve excessive interior pressures in the form of a fluted stab located adjacent a pressure deformable portion of the container such that upon deformation thereof the stab will make contact and pierce an opening therethrough.

2 Claims, 7 Drawing Figures PATENTEDAUG 1 1972 3 680.743

sum 1 or 3 INVENTOR RICH M0 QE /AG L BY QM ATH )RNIJY PATENTED 1 I97? SHEET 2 OF 3 INVENTOR X/cm'o A. fE/A/AHGEL ATTORNEY PATENTEDMIS 1 912 sum 3 OF 3 INVENTOR film/4m E. (Em/max.

ATTORNEY BACKGROUND OF THE INVENTION 2. Safety Vents which operate through the existing aerosol dispensing valve. These do not provide an I adequate level of safety because of the possibility of plugging the small orifice openings in the valve;

3. Reseal type of valves using springs or elastomeric materials. These are generally complex and costly;

4. Surface scoring methods for pressure venting. These have not proved reliable because material thickness tolerances do not allow for accurate scored thickness control. Scoring also removes protective plating which introduces a corrosion problem.

SUMMARY OF THE INVENTION The foregoing shortcomings, as well as other disadvantages,of prior art devices are overcome according to the teaching of the present invention'which provides an aerosol container overpressure venting structure which is inexpensive, reliable, easy to produce and compatible with existing aerosol container manufacturing techniques.

Basically the present invention provides a single operation rupture system which functions upon overpressure interiorly of the aerosol container. The overpressure may be caused by excessive heat or the like.

It has been found that when conventional aerosol containers are subjected to high internal pressures the bottom normally domed portion of the can convolutes whereas the top of the can generally expands at pressures below the rupture pressure of the can. According to one aspect of the present invention a spike or stab is placed adjacent the bottom end or the top of the can in such a position that when the bottom end convolutes or the top expands, the spike could make contact with and pierce these moving portions of the can to thereby release the pressure before rupture of the can occurs.

According to another aspect of the present invention a depression located in the top of the'aerosol container in the form of a pressed dimple which expands outwardly in response to overpressures and makes contact with a spike or stab which pierces the moving dimple and allows the overpressure to vent.

The spike or stab is preferably fluted to prevent resealing of the pierced opening as may occur with a solid pin.

Basically, then, the present invention provides; an

' aerosol container pressure venting apparatus comprising; a pressurized aerosol container having a body section, a top wall section and a bottom wall section, at

least a portion of at least one of said sections so con i structed and arranged to deflect with respect to the remainder of the container in response to overpressure therein, and a stab having a sharp end portion supported on the exterior of said container adjacent and spaced from said deflecting portion such that said stab pierces said portion upon a predetermined deflection thereof to thereby vent said overpressure to the exterior of said container.

BRIEF DESCRIPTION OF THE DRAWINGS For a fuller understanding of the present invention reference should now be had to the following detailed description of the same taken in conjunction with the accompanying drawings wherein;

FIG. 1 is a cross-sectional view of a typical aerosol container incorporating one form of venting apparatus of the present invention;

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a fragmentary view of a typical aerosol container incorporating a second form of venting apparatus;

FIG. 4 is a view taken along line 4-4 of FIGURE 3;

FIG. 5 is a fragmentary view of the bottom portion of an aerosol container incorporating a third form of venting apparatus;

FIG. 6 is a fragmentary view taken along line 6--6 of FIG. 5; and

FIG. 7 is a fragmentary along line 7-7 of FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings and, more particularly, to FIGS. 1 and 2, a typical aerosol dispensing container is generally depicted at 10. As is conventional the container comprises a cylindrical body section 12 to the open upper end of which is sealingly attached a cross-sectional view taken top wall section which comprises a substantially domeshaped top 14 and a valve mounting cup 18. Top 14 may be attached to the body 12 by a rolled double seam as illustrated at 16. Of course, any other suitable method of attachment may be utilized.

Top 14 has a central opening through which is sealingly secured the valve mounting cup 18, as is conventional. An aerosol dispensing valve 20 is sealingly secured to cup 18, which valve is actuated by push button 22. The ingredients located within the interior chamber 24 of the container is delivered to the valve via an attached dip tube 26. Since the details of the valve, actuator and tube are conventional and form no part of the present invention, except in combination with the venting structure to be described herein below, no further description thereof is deemed necessary.

The lower or bottom end opening of body 12 is closed by a dome base 28 which is sealingly secured thereto.

The dome-shaped portion of top 14 has a depressed section extending inwardly toward the interior chamber 24, in the form of a cup-shaped dimple 30, the

' bottom portion 32 of which is capable of flexing with a snap-action to the position shown in dashed lines 34. Mounted exteriorly of chamber 24 and attached thereto by crimping or the like and directly located above dimple 30 is a domed venting cap 36, having a plurality of venting ports 38. A spike supporting bridge 40 extends diametrically across the lower portion of the cap and is suitably attached to or made integral therewith. A fluted spike is formed by two tabs 42, 44 projecting from opposite sides of the bridge 40 and bent together such that the ends thereof remote from the bridge make contact at 46 and are spaced from and adjacent the center of flexing portion 32 of the dimple 30. As shown, the ends at 46 are pointed and sharp.

In operation of the FIG. 1 embodiment, when the interior pressure in chamber 24 becomes excessive, portion 32 of dimple 30 will flex with a snap-action to its dashed line position 34, whereupon the pointed and sharp ends 46, defining the fluted spike, will pierce an opening through portion 32 and allow the excessive pressure to be relieved through ports 38 to thereby prevent the aerosol can from bursting. The space between tabs 42 and 46 defining the fluted portion of the spike will insure that communication is maintained between the interior and exterior of the container once an opening is pierced through 32. This eliminates the possibility of the spike clogging the opening.

In the foregoing as well as the forthcoming embodiments to be described all portions of the container and venting structure are made of a thin and flexible sheet material such as tin plate.

Referring now to the embodiment illustrated in FIGS. 3 and 4, wherein parts similar to the FIG. 1 cmbodiments are depicted by similar numerals, the venting apparatus takes the form of an annular spike ring 40' which is snap fitted on to the annular rolled portion 16 of the container top 14. This fit is accomplished by a depending cylindrical skirt 410 having a plurality of flexible fingers 420 that flex over roll 16 and lock securely therebeneath.

A plurality of spikes 46' depend from ring 40' and are located adjacent a curved or annular rolled portion 140 of container top 14.

When the container pressure becomes excessive the tip 14 will be deformed to the dashed line position whereupon the rolled portion 140 will make contact with and be pierced by the spikes 46' to thereby relieve the excessive pressure.

In the embodiment shown in FIGS. 5, 6 and 7 the fluted stab is located adjacent the inwardly domed bottom 28 of the aerosol container. To this end, a stab supporting bridge 40" is suitably mounted across the bottom of cylinder 12 as by crimping or the like. A pair of tabs 42", 44" having sharp points that meet at 46" project from the bridge 40 upwardly toward and spaced from the central portion of bottom surface 28.

When the pressure in chamber 24 becomes excessive bottom 28 will deform to the dashed line position 29 with a snap-action whereupon pointed edge 46" will pierce an opening therethrough and allow the excessive pressure to be safely vented.

Although preferred embodiments of the present invention have been illustrated and described, changes will obviously occur to those skilled in the art. For example, the stab or spike supporting structure could be carried by the valve mounting cup 18. Additionally the deformable dimple and its coacting stab could be located in any convenient portion of the aerosol conaine r such as e body or bottom secti ns, It is thereore lntended t at the invention is to be lmlted only by the scope of the appended claims.

lclaim:

1. A safety venting apparatus for aerosol containers,

comprising;

A. a pressurized aerosol container having,

1. a body section, 2. a top wall section, and 3. a bottom wall section,

B. at least a portion of said top wall section so constructed and arranged to deflect with respect to the remainder of said container in response to excessive pressures,

C. an annular ring fitted onto said body section adjacent said top wall section,

D. stab means comprising a plurality of sharp ended portions circumferentially arranged on said annular ring adjacent to and spaced from said portion of said top wall section such that said sharp ended portions pierce said portion of said top wall section upon deflection thereof to thereby vent said excessive pressure to the exterior of said container, and

E. a dispensing valve mounted on said container actuable to normally deliver the contents of said container to a point of use.

2. The apparatus according to claim 1, wherein said ring is an annular snap ring.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2336490 *Jul 25, 1940Dec 14, 1943Lo Vico RosarioPreset pressure can for frozen food or the like
US3074602 *Nov 26, 1958Jan 22, 1963Charlton Shillady MarionPressure relief devices for pressure vessels and methods of making the same
US3145874 *Oct 22, 1962Aug 25, 1964Webb James EMeans for controlling rupture of shock tube diaphragms
US3155271 *Jul 5, 1963Nov 3, 1964Calmec Mfg CorpRupture disc mounting
US3241713 *Apr 20, 1964Mar 22, 1966Western Filling CorpThermal safety device for aerosol containers
US3294277 *Oct 26, 1964Dec 27, 1966Black Sivalls & Bryson IncSafety device for pressure vessels
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3786967 *Jun 8, 1972Jan 22, 1974American Can CoPressure relief system for an aerosol container
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
US4003505 *Dec 23, 1975Jan 18, 1977Aluminium Suisse S.A.Relief vent for pressurized cans
US4269214 *Jan 19, 1979May 26, 1981Bs & B Safety Systems, Inc.Safety pressure relief device
US4331277 *May 23, 1980May 25, 1982United States Surgical CorporationSelf-contained gas powered surgical stapler
US4407432 *Dec 22, 1980Oct 4, 1983United States Surgical CorporationPressure relief system for pressurized gas containers
US4721224 *Dec 31, 1986Jan 26, 1988Nittoseiki Kabushiki KaishaPressure vessel having pressure releasing mechanism
US4993602 *Jun 7, 1989Feb 19, 1991Prd, Inc.Pressure relief device for a pressurized container
US5121858 *Sep 7, 1990Jun 16, 1992Chong Wun CPressure relief system
US5249701 *May 15, 1992Oct 5, 1993Christian F. Kinkel & Materials Engineering, Inc.Aerosol container with pressure release structure
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
DE3544924A1 *Dec 19, 1985Jul 2, 1987Euscher Gmbh & Co EwaldValve plate for bearing aerosol valves
WO1981003303A1 *Apr 17, 1981Nov 26, 1981United States Surgical CorpSelf-contained gas powered surgical stapler
Classifications
U.S. Classification222/397, 220/89.4
International ClassificationB65D83/14
Cooperative ClassificationB65D83/70
European ClassificationB65D83/70