US3889835A - One-piece pressure container - Google Patents

One-piece pressure container Download PDF

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Publication number
US3889835A
US3889835A US468962A US46896274A US3889835A US 3889835 A US3889835 A US 3889835A US 468962 A US468962 A US 468962A US 46896274 A US46896274 A US 46896274A US 3889835 A US3889835 A US 3889835A
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concentric
pressure container
radius
central portion
contiguous
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US468962A
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Richard H Avant
Peter R Webster
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Newell Companies Inc
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Bernz O Matic Corp
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Assigned to NEWELL COMPANIES, INC., A DE CORP. reassignment NEWELL COMPANIES, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BERNZ O MATIC CORPORATION A NY CORP
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/14—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of aluminium; constructed of non-magnetic steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/056—Small (<1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • F17C2203/0617—Single wall with one layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0646—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/018—Supporting feet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/011—Improving strength
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/07—Applications for household use
    • F17C2270/0754—Fire extinguishers

Definitions

  • a pressure container made of aluminum, for example, includes a generally cylindrical body and a self-standing integral bottom which has a down The thinnest portion of the bottom is in the upwardly curved portion and is not less than about 1.5, preferably 2 times the wall thickness of the cylindrical body.
  • This invention relates to a one-piece pressure container preferably made of aluminum which is especially suited for use as a fire extinguisher where the contents are under relatively high pressure. More particularly, this invention relates to a one-piece aluminum pressure container having an integral self-standing bottom which meets contemporary safety standards.
  • Impact extruded aluminum containers have been used for fire extinguishers and the like where the contents are under pressure. At first, such containers were formed with a domed bottom, and, if the container was to be self-standing, a separate plastic or metal bottom cap had to be attached over the domed bottom. It was then proposed to reverse the bottom of the container and impact extrude the container with an integral skirt portion. However, because of certain unique cold flow characteristics of aluminum under high impact, it was found that reversing the bottom to form a skirt portion resulted in the formation ofa concentric, unfused seam which reached depths as great as about 0.14 inch. This created an undesirable structural defect which resulted in the skirt portion falling off when the container was subjected to high impact such as by dropping a loaded or charged fire extinguisher onto a hard surface.
  • the present invention overcomes this structural problem and provides a self-standing integral bottom structure for aluminum pressure containers that can be formed as a part of the container by impact extrusion in one step.
  • the pressure container of the invention is structurally sound and meets all requirements of Underwriters Laboratories, Inc. (UL) for fire extinguishers and the like.
  • UL Underwriters Laboratories, Inc.
  • the pressure container of the invention comprises a generally cylindrical body and a self-standing integral bottom having a peripheral skirt portion, said bottom having an inside radius of about R and an exterior configuration which, in vertical cross-section along a diameter line, includes:
  • the thinnest portion of the bottom is in the upwardly curved portion and is not less than about 1.5, preferably about 2 times the wall thickness of the cylindrical body.
  • FIG. 1 is a vertical cross-sectional view, partly broken away, along the longitudinal axis of the pressure container of the present invention.
  • FIG. 2 is vertical cross-sectional view, partly broken away, of an integral bottom structure according to the prior art.
  • the pressure container of the invention which is preferably formed from aluminum is shown to include a generally cylindrical body 10 and a self-standing integral bottom which is generally identified by reference numeral 12.
  • An otherwise conventional threaded neck portion 14 is formed at the upper portion of the container as shown.
  • the upper or neck portion of the container can have any configuration, depending on the use intended for the container and the neck structure shown in the drawing is only for purposes of illustration and is not intended to be otherwise limiting.
  • the integral bottom 12 is shown to have an inside radius R and an exterior configuration which, in vertical cross-section along a diameter line includes, central portion 20 having a diameter d, upwardly curved portion 22 which is concentric with and contiguous to the central portion 20 and having a radius R equal to about 0.22 R, a concentric, downwardly curved portion 26 joined to or contiguous with the skirt portion 28 and having a radius R equal to about 0.19 R and a generally flat concentric portion 24 which is contiguous with and between the curved portions 22 and 26.
  • the thinnest portion of the bottom 12 is positioned or located in the upwardly curved portion 22 and is identified in the drawing by reference character e.
  • the thickness e is not less than about 1.5, preferably 2 times the wall thickness f of the cylindrical body 10.
  • the central portion 20 lies in a horizontal plane which is higher than the horizontal plane of the lower end of the skirt portion 28.
  • the central portion 20 has a diameter d as shown and the diameter of the central 20, together with the upwardly curved portion 22 is about 1.5 d. This is shown in the drawing by the diameter line c.
  • the diameter of the central portion d, together with the upwardly curved portion 22 and the flat portion 24 is preferably about 2 d. This is shown in the drawing by diameter line a.
  • the width b of the flat portion 24 will vary, depending on the size of the container, whereas the relationship between the radii R, R and R will remain fairly constant as described above.
  • the lower end of the skirt portion 28 is preferably curved and has a minimum radius R, which is equal to about 0.045 R.
  • FIG. 2 of the drawing depicts a concentric seam 18 which radiates from the curved portion 16 of the bottom of the prior art container.
  • This seam 18 is formed due to certain unique cold flow characteristics of aluminum under high impact and reaches depths as great as about 0.14 inch.
  • the bottom structure of the invention as shown in FIG. 1 practically eliminates this undesirable unfused seam 18 and provides a smooth transformation from the'central portion 20 up through the portion 22, across the portion 24, down through the portion 26 and finally down to the skirt 28.
  • a certain residual seam or surface roughening will occur in the downwardly curved portion 26.
  • a concentric seam 30, as shown in FIG. 1 in the downwardly curved portion 26 can be tolerated with depths between about 0.03 to about 0.06 inch and preferably no greater than 0.04 inch deep.
  • the upwardly curved portion 22 containing the minimum bottom thickness e is believed to function as a gate area for the cold flowing aluminum and the flat portion 24, following the upwardly curved portion 22, is believed to function as a pressure retard zone which compensates for the differences in cold flow characteristics of the aluminum.
  • the flat portion 24 acts as a pressure retard zone in cooperation with the gate e, which cause the aluminum to cold flow at substantially the same rates and thereby form the downwardly curved portion 26 and the downwardly extending skirt portion 28 without the formation of an undesirable unfused seam 18, such as shown in FIG. 2 of the drawing.
  • Pressure container comprising a generally cylindrical body and a self-standing integral bottom having a peripheral skirt portion, said bottom having an inside radius of about R and an exterior configuration which,
  • in vertical cross-section along a diameter line includes: i. a disc-like, circular central portion;

Abstract

A pressure container made of aluminum, for example, is disclosed and includes a generally cylindrical body and a self-standing integral bottom which has a downwardly extending peripheral skirt portion. The bottom of the container has an inside radius of about R1 and an exterior configuration which, in vertical crosssection along a diameter line includes: I. A DISC-LIKE, CIRCULAR CENTRAL PORTION; II. A CONCENTRIC UPWARDLY CURVED PORTION WHICH IS CONTIGUOUS WITH THE CENTRAL PORTION AND HAS A RADIUS OF ABOUT 0.22 R1; iii. a concentric downwardly curved portion contiguous with the skirt portion and having a radius of about 0.19 R1; and IV. A GENERALLY FLAT CONCENTRIC PORTION CONTIGUOUS WITH AND BETWEEN THE CURVED PORTIONS. The thinnest portion of the bottom is in the upwardly curved portion and is not less than about 1.5, preferably 2 times the wall thickness of the cylindrical body.

Description

United States Patent [191 Avant et al.
[ 1 ONE-PIECE PRESSURE CONTAINER [75] Inventors: Richard H. Avant, Rochester; Peter R. Webster, Greece, both of NY.
[73] Assignee: BernzOmatic Corporation,
Rochester, NY.
[22] Filed: May 10,l974
21 Appl. No.: 468,962
[52] US. Cl. 220/3; 220/66; 220/70 [51] TM. CI. ..F17c 1/14; B65d l/16; B65d H42 [58] Field of Search 220/3, 66, 67, 70, 73, 220/74; 215/1 R, 1 C
[56] References Cited UNITED STATES PATENTS 79,692 7/1868 Scantlin et al. 220/70 7 651,884 6/1900 Platz 220/70 1,878,709 9/1932 Kerr..... 220/73 X 2,541,065 2/1951 Jabour 220/3 3,038,627 6/1962 Daley 220/3 3,115,281 12/1963 vSomme.... 220/70 X 3,279,640 10/1966 Dodson 220/67 X 3,409,167 11/1968 Blanchard... 220/66 3,434,626 3/1969 Kinslow, Jr. 220/66 FOREIGN PATENTS OR APPLICATIONS 11,593 7/1889 United Kingdom 220/70 432,718 8/1935 United Kingdom.... 220/3 1,344,861 10/1963 France 220/3 Sweden 220/70 June 17, 1975 Primary Examiner-William 1. Price 1 Assistant Examiner-Stephen Marcus I Attorney, Agent, or Firm-Burge ss, Dinklage Sprung [5 7] ABSTRACT A pressure container made of aluminum, for example, is disclosed and includes a generally cylindrical body and a self-standing integral bottom which has a down The thinnest portion of the bottom is in the upwardly curved portion and is not less than about 1.5, preferably 2 times the wall thickness of the cylindrical body.
8 Claims, 2 Drawing Figures portion PAIENTEDJUN 11 ms :19; 8 89,8 35
FIG. I.
PRIOR RT ONE-PIECE PRESSURE CONTAINER BACKGROUND This invention relates to a one-piece pressure container preferably made of aluminum which is especially suited for use as a fire extinguisher where the contents are under relatively high pressure. More particularly, this invention relates to a one-piece aluminum pressure container having an integral self-standing bottom which meets contemporary safety standards.
Impact extruded aluminum containers have been used for fire extinguishers and the like where the contents are under pressure. At first, such containers were formed with a domed bottom, and, if the container was to be self-standing, a separate plastic or metal bottom cap had to be attached over the domed bottom. It was then proposed to reverse the bottom of the container and impact extrude the container with an integral skirt portion. However, because of certain unique cold flow characteristics of aluminum under high impact, it was found that reversing the bottom to form a skirt portion resulted in the formation ofa concentric, unfused seam which reached depths as great as about 0.14 inch. This created an undesirable structural defect which resulted in the skirt portion falling off when the container was subjected to high impact such as by dropping a loaded or charged fire extinguisher onto a hard surface.
The present invention overcomes this structural problem and provides a self-standing integral bottom structure for aluminum pressure containers that can be formed as a part of the container by impact extrusion in one step. The pressure container of the invention is structurally sound and meets all requirements of Underwriters Laboratories, Inc. (UL) for fire extinguishers and the like.
SUMMARY The pressure container of the invention comprises a generally cylindrical body and a self-standing integral bottom having a peripheral skirt portion, said bottom having an inside radius of about R and an exterior configuration which, in vertical cross-section along a diameter line, includes:
i. a disc-like, circular central portion;
ii. a concentric upwardly curved portion contiguous with the central portion and having a radius of about 0.22 R;
iii. a concentric downwardly curved portion contiguous with the skirt portion and having a radius of about 0.19 R; and
iv. a generally flat concentric portion contiguous with and between the curved portions.
The thinnest portion of the bottom is in the upwardly curved portion and is not less than about 1.5, preferably about 2 times the wall thickness of the cylindrical body.
With a bottom structure as described, it is now possible to form a one-piece aluminum pressure container in one step having an integral bottom with a concentric seam no greater than about 0.03 to about 0.06 inch deep, preferably no greater than about 0.04 inch deep.
DESCRIPTION OF THE DRAWING The present invention will be more fully understood from the following description taken in conjunction with the accompanying drawing wherein:
FIG. 1 is a vertical cross-sectional view, partly broken away, along the longitudinal axis of the pressure container of the present invention; and
FIG. 2 is vertical cross-sectional view, partly broken away, of an integral bottom structure according to the prior art.
DESCRIPTION Referring now to the drawing and in particular FIG. 1, the pressure container of the invention which is preferably formed from aluminum is shown to include a generally cylindrical body 10 and a self-standing integral bottom which is generally identified by reference numeral 12. An otherwise conventional threaded neck portion 14 is formed at the upper portion of the container as shown. The upper or neck portion of the container can have any configuration, depending on the use intended for the container and the neck structure shown in the drawing is only for purposes of illustration and is not intended to be otherwise limiting.
The integral bottom 12 is shown to have an inside radius R and an exterior configuration which, in vertical cross-section along a diameter line includes, central portion 20 having a diameter d, upwardly curved portion 22 which is concentric with and contiguous to the central portion 20 and having a radius R equal to about 0.22 R, a concentric, downwardly curved portion 26 joined to or contiguous with the skirt portion 28 and having a radius R equal to about 0.19 R and a generally flat concentric portion 24 which is contiguous with and between the curved portions 22 and 26.
The thinnest portion of the bottom 12 is positioned or located in the upwardly curved portion 22 and is identified in the drawing by reference character e. The thickness e is not less than about 1.5, preferably 2 times the wall thickness f of the cylindrical body 10.
To prevent rocking and to insure upright stability of the container, the central portion 20 lies in a horizontal plane which is higher than the horizontal plane of the lower end of the skirt portion 28.
In a further preferred embodiment the central portion 20 has a diameter d as shown and the diameter of the central 20, together with the upwardly curved portion 22 is about 1.5 d. This is shown in the drawing by the diameter line c. The diameter of the central portion d, together with the upwardly curved portion 22 and the flat portion 24 is preferably about 2 d. This is shown in the drawing by diameter line a. The width b of the flat portion 24 will vary, depending on the size of the container, whereas the relationship between the radii R, R and R will remain fairly constant as described above.
The lower end of the skirt portion 28 is preferably curved and has a minimum radius R, which is equal to about 0.045 R.
FIG. 2 of the drawing depicts a concentric seam 18 which radiates from the curved portion 16 of the bottom of the prior art container. This seam 18 is formed due to certain unique cold flow characteristics of aluminum under high impact and reaches depths as great as about 0.14 inch. The bottom structure of the invention as shown in FIG. 1 practically eliminates this undesirable unfused seam 18 and provides a smooth transformation from the'central portion 20 up through the portion 22, across the portion 24, down through the portion 26 and finally down to the skirt 28. In practice it has been found that a certain residual seam or surface roughening will occur in the downwardly curved portion 26. However, this does not detract from the structural integrity of the container of'the invention" and it has been found that a concentric seam 30, as shown in FIG. 1 in the downwardly curved portion 26, can be tolerated with depths between about 0.03 to about 0.06 inch and preferably no greater than 0.04 inch deep.
When an aluminum slug is inserted into the cavity of an impact extrusion die, it is believed that a lower portion of the slug cold flows along the bottom of the die conforming to the configuration thereof, while an upper zone flows outwardly to the side of the die cavity. With a sharp radius such as shown by reference numeral 16 in FIG. 2, the aluminum in the lower zone is believed to flow over the radius 16 and into the downwardly extending skirt portion faster than aluminum flowing from the upper portion of the slug. This is thought to account for the undesirable formation of an unfused seam 18 which can cause the skirt portion to fall off upon impact. In the present invention, the upwardly curved portion 22 containing the minimum bottom thickness e is believed to function as a gate area for the cold flowing aluminum and the flat portion 24, following the upwardly curved portion 22, is believed to function as a pressure retard zone which compensates for the differences in cold flow characteristics of the aluminum. In other words, the flat portion 24 acts as a pressure retard zone in cooperation with the gate e, which cause the aluminum to cold flow at substantially the same rates and thereby form the downwardly curved portion 26 and the downwardly extending skirt portion 28 without the formation of an undesirable unfused seam 18, such as shown in FIG. 2 of the drawing.
What is claimed is:
1. Pressure container comprising a generally cylindrical body and a self-standing integral bottom having a peripheral skirt portion, said bottom having an inside radius of about R and an exterior configuration which,
in vertical cross-section along a diameter line, includes: i. a disc-like, circular central portion;
ii. a concentric upwardly curved portion contiguous with said central portion and having a radius of about 0.22 R;
iii. a concentric downwardly curved portion contiguous with the skirt portion and having a radius of about 0.19 R; and
iv. a generally flat concentric portion contiguous with and between the curved portions.
2. Pressure container of claim 1 wherein the thinnest portion of said bottom is in the upwardly curved portion and is not less than 1.5 times the wall thickness of the cylindrical body.
3. Pressure container of claim 1 wherein said central portion lies in a plane higher than the horizontal plane of the lower end of the skirt portion.
4. Pressure container of claim 1 wherein said central portion has a diameter d and the diameter of the central portion, together with the concentric upwardly curved portion is about 1.5 d.
5. Pressure container of claim 1 wherein said central portion has a diameter d and the diameter of said central portion, together with the concentric upwardly curved portion and the concentric generally flat portion is about 2 d.
6. Pressure container of claim 2 wherein said thinnest portion is not less than about 2 times the wall thickness of the cylindrical body.
7. Pressure container of claim 1 wherein the lower end of the skirt portion is curved and has a minimum radius of about 0.045 R.
8. Pressure container of claim 1 wherein said downwardly curved portion has a concentric circular seam with a depth in the range of about 0.03 to about 0.06

Claims (8)

1. Pressure container comprising a generally cylindrical body and a self-standing integral bottom having a peripheral skirt portion, said bottom having an inside radius of about R1 and an exterior configuration which, in vertical cross-section along a diameter line, includes: i. a disc-like, circular central portion; ii. a concentric upwardly curved portion contiguous with said central portion and having a radius of about 0.22 R1; iii. a concentric downwardly curved portion contiguous with the skirt portion and having a radius of about 0.19 R1; and iv. a generally flat concentric portion contiguous with and between the curved portions.
2. Pressure container of claim 1 wherein the thinnest portion of said bottom is in the upwardly curved portion and is not less than 1.5 times the wall thickness of the cylindrical body.
3. Pressure container of claim 1 wherein said central portion lies in a plane higher than the horizontal plane of the lower end of the skirt portion.
4. Pressure container of claim 1 wherein said central portion has a diameter d and the diameter of the central portion, together with the concentric upwardly curved portion is about 1.5 d.
5. Pressure container of claim 1 wherein said central portion has a diameter d and the diameter of said central portion, together with the concentric upwardly curved portion and the concentric generally flat portion is about 2 d.
6. Pressure container of claim 2 wherein said thinnest portion is not less than about 2 times the wall thickness of the cylindrical body.
7. Pressure container of claim 1 wherein The lower end of the skirt portion is curved and has a minimum radius of about 0.045 R1.
8. Pressure container of claim 1 wherein said downwardly curved portion has a concentric circular seam with a depth in the range of about 0.03 to about 0.06 inch.
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4402909A (en) * 1981-10-28 1983-09-06 Chemplex Industries, Inc. Vials for comminuting and blending samples for spectrochemical analysis
DE3327171A1 (en) * 1983-02-25 1984-08-30 Simmel S.p.A., Castelfranco Veneto, Treviso BOTTLE FOR TECHNICAL GAS
DE3741628A1 (en) * 1987-12-04 1989-06-15 Mannesmann Ag CONCAVE BOTTLE AND METHOD FOR PRODUCING THE SAME
US5598729A (en) * 1994-10-26 1997-02-04 Tandem Systems, Inc. System and method for constructing wall of a tube
WO1999030813A1 (en) * 1997-12-15 1999-06-24 Olin Corporation High pressure quartz glass bubbler ampoule and assembly
US6212926B1 (en) 1999-04-21 2001-04-10 Tandem Systems, Inc. Method for spin forming a tube
US6213325B1 (en) 1998-07-10 2001-04-10 Crown Cork & Seal Technologies Corporation Footed container and base therefor
US6296471B1 (en) * 1998-08-26 2001-10-02 Crown Cork & Seal Technologies Corporation Mold used to form a footed container and base therefor
EP1701086A2 (en) 2005-03-07 2006-09-13 Rothenberger AG Source of pressure gas with combustion gas for manual operation
EP1701085A2 (en) 2005-03-07 2006-09-13 Rothenberger AG Source of pressure gas with combustion gas for manual operation
CN103084509A (en) * 2013-01-23 2013-05-08 浙江金盾压力容器有限公司 Bottom processing device and bottom processing technology for pipe-made steel cylinder billet

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US4402909A (en) * 1981-10-28 1983-09-06 Chemplex Industries, Inc. Vials for comminuting and blending samples for spectrochemical analysis
DE3327171A1 (en) * 1983-02-25 1984-08-30 Simmel S.p.A., Castelfranco Veneto, Treviso BOTTLE FOR TECHNICAL GAS
EP0117849A2 (en) * 1983-02-25 1984-09-05 Simmel Difesa S.R.L. Convex type bottom with a bearing rim for bottles for industrial gases obtained by means of hot forging from a steel billet and fixture for forming said bottom
US4609118A (en) * 1983-02-25 1986-09-02 Simmel S.P.A. Convex type bottom with a bearing rim for bottles for industrial gases obtained by means of hot forging from a steel billet
EP0117849B1 (en) * 1983-02-25 1989-11-02 Simmel Difesa S.R.L. Convex type bottom with a bearing rim for bottles for industrial gases obtained by means of hot forging from a steel billet and fixture for forming said bottom
DE3741628A1 (en) * 1987-12-04 1989-06-15 Mannesmann Ag CONCAVE BOTTLE AND METHOD FOR PRODUCING THE SAME
US5598729A (en) * 1994-10-26 1997-02-04 Tandem Systems, Inc. System and method for constructing wall of a tube
US5845527A (en) * 1994-10-26 1998-12-08 Tandem Systems, Inc. System and method for constricting wall of a tube
US6045125A (en) * 1997-12-15 2000-04-04 Olin Corporation High pressure quartz glass bubbler ampoule and assembly
US5992830A (en) * 1997-12-15 1999-11-30 Olin Corporation High pressure quartz glass bubbler
WO1999030813A1 (en) * 1997-12-15 1999-06-24 Olin Corporation High pressure quartz glass bubbler ampoule and assembly
AU741517B2 (en) * 1997-12-15 2001-12-06 Arch Specialty Chemicals, Inc. High pressure quartz glass bubbler ampoule and assembly
US6213325B1 (en) 1998-07-10 2001-04-10 Crown Cork & Seal Technologies Corporation Footed container and base therefor
US6296471B1 (en) * 1998-08-26 2001-10-02 Crown Cork & Seal Technologies Corporation Mold used to form a footed container and base therefor
US6212926B1 (en) 1999-04-21 2001-04-10 Tandem Systems, Inc. Method for spin forming a tube
EP1701086A2 (en) 2005-03-07 2006-09-13 Rothenberger AG Source of pressure gas with combustion gas for manual operation
EP1701085A2 (en) 2005-03-07 2006-09-13 Rothenberger AG Source of pressure gas with combustion gas for manual operation
DE102005010281B3 (en) * 2005-03-07 2006-10-05 Rothenberger Ag Compressed gas source with fuel gas filling
DE102005010282B3 (en) * 2005-03-07 2006-11-02 Rothenberger Ag Compressed gas source with fuel gas filling
EP1701086A3 (en) * 2005-03-07 2011-04-20 Rothenberger AG Source of pressure gas with combustion gas for manual operation
EP1701085A3 (en) * 2005-03-07 2011-04-20 Rothenberger AG Source of pressure gas with combustion gas for manual operation
CN103084509A (en) * 2013-01-23 2013-05-08 浙江金盾压力容器有限公司 Bottom processing device and bottom processing technology for pipe-made steel cylinder billet

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