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Publication numberUS3706393 A
Publication typeGrant
Publication dateDec 19, 1972
Filing dateJul 12, 1971
Priority dateJul 12, 1971
Publication numberUS 3706393 A, US 3706393A, US-A-3706393, US3706393 A, US3706393A
InventorsGeorge L Curtis, James H Riesenberg, Ralph E Kelly
Original AssigneePelorex Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Plastic container and method of making the same
US 3706393 A
Abstract
A plastic container has a cylindrical body member and a bottom member which are separately molded. The body member is formed with an open bottom and has an annular groove in its bottom edge. The bottom member has a pair of concentric upstanding annular flanges, the outer one fitting within the annular groove in the bottom edge of the body member, and the inner one fitting within the open bottom of the container to abut the lower portion of the interior wall thereof. The parts are permanently sealed to each other by ultrasonic welding, usually after a bottom-filling operation with the container in an inverted position.
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United States Patent Curtis et al. I

1451 Dec. 19,1972

[54] PLASTIC CONTAINER AND METHOD OF MAKING THE SAME [72] Inventors: George L. Curtis, Wilton, Conn.; James H. Riesenberg, Amherst; Ralph E. Kelly, Lancaster, both of [21] Appl. No.: 161,589

FOREIGN PATENTS OR APPLlCATlONS 235,199 8/1964 Austria ..220/67 Primary Examiner-Joseph R. Leclair Assistant ExaminerJames R. Garrett Attorney-Conrad Christel et al.

[57] ABSTRACT A plastic container has a cylindrical body member and a bottom member which are separately molded. The body member is formed with an open bottom and has an annular groove in its bottom edge. The bottom member has a pair of concentric upstanding annular flanges, the outer one fitting within the annular groove in the bottom edge of the body member, and the inner one fitting within the open bottom of the container to abut the lower portion of the interior wall thereof. The parts are permanently sealed to each other by ultrasonic welding, usually after a bottom-filling operation with the container in an inverted position. I

6 Claims, 2 Drawing Figures PATENTED 3,706,393

FIG. I.

INVENTORS George L. Curtis Fl 6 James H. Riesenberg Ralph E. Kelly ATTQRN EYS PLASTIC CONTAINER AND METHOD OF MAKING THE SAME BACKGROUND OF THE INVENTION This invention relates to the manufacture of plastic containers and, more particularly, to plastic containers wherein the body portion of the container is made with an open bottom and a bottom wall is subsequently attached thereto.

Plastic containers molded by various methods such as injection molding, blow molding, and otherwise, are of course in widespread use. p

In many plastic containers the bottom wall is molded integrally with the side wall or body of the container but the present invention relates particularly to containers wherein the container body and the upper end or neck portion thereof are molded integrally with the bottom end of the container open. In such containers the bottom member is subsequently applied.

' This type of container is employed in cases where the upper end construction of the container has a relatively constricted neck formation and wherein the body, including the upper wall structure, is desired to be injection molded.

A particular area wherein containerswith separate later-applied bottom members are desirably employed is in the field of aerosol containers wherein the contents of the container and the propellant are deposited in the container with the same in inverted condition, the contents and propellant being deposited in the container before the bottom wall is applied.

In containers having separately applied bottom wall members, the joint between the container body and the bottom wall is frequently'inadequate structurally and hermetically. When containers of this kind are dropped, they commonly plummet downwardly bottom first and usually land angularly on the bottom rim of the container with the frequent result being leakage of the joint between the container body and bottom. In fact the pressure of the contents under impact dropping of the container as heretofore constructed sometimes blows the bottom completely from the container body.

SUMMARY OF THE INVENTION In the present invention the container body or side wall is generally cylindrical and is formed about its lower edge with a groove which receives an annular tongue formation on the bottom element. This much is known in the present art and the container construction of the present invention also includes an upstanding annular flange on the bottom member which engages the lower interior wall of the container body, and which in effect backs up the tongue and groove joint to prevent loosening of this joint by impact, as when the container is dropped. More importantly, this upstanding flange prevents internal pressure in the container from having direct access to the tongue and groove joint per se, which joint has heretofore been the weakest point in container constructions of this general type.

The bottom construction of the present invention, including the tongue and groove joint and the additional internal flange which rigidities the same, is also highly effective in autogenously welding the bottom to the container body as by ultrasonic vibration of the parts since the parts are fixed to each other throughout the tongue and groove construction, and also throughout at least a portion of the abutting surfaces of the interior wall of the container and the adjacent internal upstanding flange of the bottom member.

BRIEF DESCRIPTION OF THE DRAWING DESCRIPTION OF THE ILLUSTRATED I EMBODIMENT In FIG. 1 the numeral 10 designates a generally cylindrical container body having a bottom wall member 11 and an aerosol dispensing means 12 at the upper end thereof. FIG. 2 shows the lower portion of the container of FIG. 1 on a considerably enlarged scale and in an inverted position, in which position the container is filled through its open bottom and then provided with the bottom wall member of the present invention.

In the form shown in FIG. 2, the generally cylindrical side wall of the container may be injection molded or otherwise formed of plastic material and the side wall flares toward its lower edge to provide a lower edge portion of increased thickness. An annular -groove 14 having flaring side wallsis formed in the bottom edge of container body 10 and groove 14 has an annular enlargement or extension at its outer portion as shown at 15 in FIG. 2.

Bottom wall 11 has a tongue formation 16. which fits snugly into groove 14 and an annular flange formation 18 which fits within the .wall of container 10 and abuts the lower interior portion of such wall as shown in F IG; 2. The numeral 20 designates one of a series of circumferentially spaced vertical grooves of generally semicircular cross section which are provided for purposes having to do with the filling and evacuating of the interior of the container and arenot otherwise involved in the present invention.

Excepting where interrupted by the grooves 20 the internal flange 18 seats against the interior wall of container 10 for substantially the full height of flange 18. The tongue 16 and annular flange 18 define in bottom 11 an annular groove which fits over the flange or rib 21 at the bottom of container 10 at the interior wall thereof adjacent to flaring groove 14.

Tongue and groove joints for container bodies are not broadly new but the construction of the present invention differs therefrom in providing the additional internal flange 18 which abuts against the interior of container body 10 and thus stiffens the same and militates against loosening of the tongue and groove joint 14, 16, particularly against impact forces from the outside of the container body and bottom as when the same is dropped.

In FIG. 2 the container is shown fragmentarily in the inverted position after the material to be dispensed and the propellant have been placed in the container through the open bottom and after such other treatment as partial evacuation has been performed. Bottom l060l l 0203 member 11 isshown in its finally assembled, position ready to be permanently sealed to body 10. Thenumeral 25 designates the horn of an ultrasonic vibration apparatus by means of which the abutting surfaces vof the container body and bottom and 11 are fused or weldedHorn 25 in the present instance comprises a cylindrical member having a radial end face which is pressed against bottom member '11 to transmit ultrasonic vibration to the assembly and produce the required welding.

This welding fuses all of the abutting surfaces of tongue 16 of bottom 11 with groove 14 of body member 10 and ordinarily this welding or fusion will extend approximately halfway along the abutting surface of flange 18 and the interior of container 10. The welding or fusing operation may produce a slight flash or roughness at the edges of the welded surfaces and the auxiliary groove portion 15, shown in FIG. 2, insures a smooth bottom finish for the container even through some of the plastic material may ooze from the welded surfaces as at the deepest part of groove 15.

A preferred embodiment of the present invention has been described and illustrated herein to illustrate the principles of the invention but it is to be understood that numerous modifications may be made without departing from the broad spirit and scope of the invention.

We claim:

, tainer body with the outer surface of said second flange in abutment with the lower portion of the interior surface of said container body to reinforce the same against external impact forces, said body member and said bottom member being sealed to each other at least in the area of said first flange formation.

2. A plastic container according to claim 1 wherein said sealing of the body andbottom members extends from said first flange formation inwardly and along at least part of the abutting surfacesof second flange and the interior surface of the container body. Y

3. A plastic container according to claim 1 wherein said members are sealed by an autogenous weld.

4. A plastic container according to claim 1 wherein said members are sealed by an ultrasonic weld.

5. A plastic container according to claim 2 wherein said members are sealed by an autogenous weld.

6. A plastic container according to claim 2 wherein said members are sealed by an ultrasonic weld.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2720332 *Apr 4, 1952Oct 11, 1955Danielson Mfg CompanyPlastic hollow housing construction
US3095112 *Dec 11, 1961Jun 25, 1963Richardson CoSealing container cover and wall members
US3108710 *Jun 10, 1958Oct 29, 1963Lange Karl ErwinFood can of synthetic material
AT235199B * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4127219 *Dec 27, 1976Nov 28, 1978Mabus Richard CNeedle dispenser
US4284168 *Aug 23, 1978Aug 18, 1981Braun AktiengesellschaftLoudspeaker enclosure
US4579242 *Jul 29, 1985Apr 1, 1986Kinetico, Inc.Molded plastic pressure tank
US5199593 *Aug 12, 1991Apr 6, 1993Fuji Photo Film Co., Ltd.Plastic case having improved ultrasonic welds between halves thereof and method for producing same
US5263606 *Jan 17, 1992Nov 23, 1993Continental Plastics, Inc.Squeeze container with sonically welded flexible tubular body and bottom cover
US5288350 *Jan 25, 1993Feb 22, 1994Fuji Photo Film Co., Ltd.Plastic case having improved ultrasonic welds between halves thereof and method for producing same
US5493787 *Dec 21, 1994Feb 27, 1996The Stanley WorksChalkline tool
US5670108 *Nov 3, 1995Sep 23, 1997General Motors CorporationMethod of molding a plastic vessel having a flash trap
US6450722Jul 3, 2000Sep 17, 2002Filtertek Inc.Semisolid product dispensing head
US6793095 *Feb 4, 1998Sep 21, 2004Essef CorporationBlow-molded pressure tank with spin-welded connector
US6890119Sep 13, 2002May 10, 2005Filtertek Inc.Semisolid product dispensing head
US8225966Mar 15, 2007Jul 24, 2012Seaquist Perfect Dispensing GmbhDispensing device
US8240518May 16, 2007Aug 14, 2012Seaquist Perfect Dispensing GmbhDispensing device and container for a cosmetic liquid
US8261952Sep 4, 2007Sep 11, 2012Seaquist Perfect Dispensing GmbhDispensing device
US8286839Dec 17, 2008Oct 16, 2012Aptar Dortmund GmbhDispensing device
US8453875Jun 18, 2009Jun 4, 2013Aptar Dortmund GmbhDispensing device
US8573449Jun 6, 2007Nov 5, 2013Aptar Dortmund GmbhDispensing device having an elastically deformable section for pumping a fluid
US8602266Jun 21, 2012Dec 10, 2013Aptar Dortmund GmbhDispensing device
US8616416Aug 11, 2009Dec 31, 2013Aptar Dortmund GmbhDelivery head
US8616417Jun 4, 2010Dec 31, 2013Aptar Dortmund GmbhValve and discharge device
US8678245Oct 29, 2012Mar 25, 2014Aptar Dortmund GmbhDispensing device
US8863994Mar 17, 2008Oct 21, 2014Aptar Dortmund GmbhDispensing device
US20100140279 *Feb 15, 2010Jun 10, 2010Sea To Summit Pty., Ltd.Collapsible Container
EP1072214A2 *Jun 30, 2000Jan 31, 2001Filtertek, Inc.Semisolid product dispensing head
WO2001074677A1 *Apr 3, 2001Oct 11, 2001Silgan Containers CorpSpin welded lid and container
Classifications
U.S. Classification220/613, 220/617, 220/DIG.310
International ClassificationB29C65/08, B65D1/16, B65D83/14
Cooperative ClassificationB65D11/02, Y10S220/31, B29C65/08, B29C66/534, B65D83/38
European ClassificationB65D83/38, B29C66/534, B29C65/08, B65D11/02