US2702600A - Fire extinguisher - Google Patents

Fire extinguisher Download PDF

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Publication number
US2702600A
US2702600A US248111A US24811151A US2702600A US 2702600 A US2702600 A US 2702600A US 248111 A US248111 A US 248111A US 24811151 A US24811151 A US 24811151A US 2702600 A US2702600 A US 2702600A
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United States
Prior art keywords
cartridge
container
extinguisher
bushing
supporting means
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Expired - Lifetime
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US248111A
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English (en)
Inventor
Scott E Allen
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Individual
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Individual
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Publication date
Priority to IT500420D priority Critical patent/IT500420A/it
Application filed by Individual filed Critical Individual
Priority to US248111A priority patent/US2702600A/en
Application granted granted Critical
Publication of US2702600A publication Critical patent/US2702600A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C13/00—Portable extinguishers which are permanently pressurised or pressurised immediately before use
    • A62C13/003—Extinguishers with spraying and projection of extinguishing agents by pressurised gas

Definitions

  • the present invention relates to fire extinguishers and particularly to an improved liquid extinguisher having a corrosion minimizing construction.
  • the usual water type extinguisher is pressurized by carbon dioxide stored in a high pressure cartridge having at least its lower end immersed in the water.
  • a high pressure cartridge having at least its lower end immersed in the water.
  • galvanic currents are often set up between the cartridge and the container resulting in corrosion.
  • the high pressure cartridge is generally made of high tensile strength steel and the container may be made of brass, stainless steel or composition material, the cartridge becomes pitted from electrolytic corrosion resulting in its lessened strength and in possible leakage of its stored pressure medium. As a result of the corrosive action, the water becomes discolored and may stain objects upon which it is discharged.
  • United States Patent No. 1,382,619 issued in 1921, describes a compressed gas-pressurized fire extinguisher made of metal preferably coated on the inside with shellac or other material which will protect the metal against any corrosive action of the liquid in the container.
  • United States Patent No. 1,976,056, issued in 1934 discloses a sheet metal container preferably of sheet copper tinned on the inside, obviously to prevent corrosion.
  • the present invention aims to overcome the difliculties and disadvantages of prior devices byproviding in an improvement thereover of a fire extinguisher in which electrical non-conducting material is used for the support of the cartridge with respect to the container so as to prevent the ow of-galvanic currents between the cartridge and the container.
  • the construction is advantageous in that the cartridge may be readily removed from its support for recharging or replacementV as a non-corrosive joint is provided by contact between electrical conducting and electrical non-conductingmaterials.
  • Figure l is a vertical sectional view of a fire extinguisher in accordance with the invention, the lower portion of the extinguisher being shown broken away.
  • Figure 2 is a partial vertical sectional view of a re extinguisher in accordance with the invention utilizing a conversion unit such as may be used to adapt a sodaacid extinguisher to a water extinguisher.
  • Figure 3 is a partial vertical sectional view of another extinguisher in accordance with the invention utilizing a modied conversion unit.
  • Figure 4 is a partialvertical sectional view of an exnited States Patent() 2,702,600 Patented Feb. 22, 1955 tinguisher in accordance with the invention utilizing another modiiied conversion unit. r
  • FIG. 1 a fire extinguisher 1 including a container 2 for a liquid re extinguishing agent, such as water, and closed by a combination carrying member and discharge head 3.
  • a cartridge 4 of stored pressure medium is provided and supported within the container 2 by the discharge head 3 which also carries puncturing means 5 for the release of the stored pressure medium from the cartridge 4.
  • the container 2 may be constructed of any suitable material such as brass or stainless steel and is generally made of a strength to withstand a test pressure of 500 pounds per square inch. 1n the usual portable extinguisher the capacity of the container 2 is generally about two and one-half gallons of uid, although a container of any desired size may be used. Adjacent the top of the container 2 is an outlet elbow 6 having attached thereto one end of a conventional' h'ose 7 which may have a nozzle at its other end (not shown) for directing an is'- suing stream to a fire.
  • a conventional' h'ose 7 Adjacent the top of the container 2 is an outlet elbow 6 having attached thereto one end of a conventional' h'ose 7 which may have a nozzle at its other end (not shown) for directing an is'- suing stream to a fire.
  • the container 2 is charged hrough a lling opening at its top denedby a ange member 9 secured to the wall of the container 2 by a welded joint 10 or Dyorher suitable means.
  • the exterior of the ange member Y9' is threaded to receive the combination discharge head and carrying handle 3.
  • the material used for the construction of the combination discharge head and carrying handle 3 may be cast brass or other suitable material.
  • a preferred form ol construction of the combination discharge head and carrying handle is described and claimed in the Frank B. Allen application, Serial No. 167,220, filed June 9, 1950, now Patent No. 2,610,693 granted September 16, 1952, although other conventional constructions may be used which are Well-known in the art.
  • the combination discharge head and' carrying handle 3 is provided on its lower surface with a downwardly depending portion 11 through which extend lateral venting passages ⁇ 12 for the outlet ot ⁇ uid released fromrthe cartridge 4.
  • AOn the top of the carrying handle 3 is an upwardly extending tubular extension 14 to receive the puncturing member 5.
  • At the outer end 'of the puncturing member 5 is a cap 15 secured by a pin 16 passing through aligned apertures in the Cap 4and puncturing member.
  • the intermediate portion of the tubular extension 14 has its passage ⁇ 17 of reduced diam'- ⁇ eter to provide a bearing surface 18 to slideably receive the puncturing'member 5.
  • the lower portion of the tubular extension 14 is of a diameter to receive' enlarged portion 19 of the puncturing member 5 which -is made with an annular recess 20 to receive an O-ring'gasket'zl.
  • the lower end of the puncturing member 5' is pointedas indicated at 22.
  • the pressurizing medium generally used is compressed carbon dioxide stored in the cartridge'4.
  • the cartidge 4 is preferably made of high tensile strength steel, although brass or otherV material with suiicient tensile strength' may be used'.
  • the cartridge is tted with a closure tting 26', 'such as is disclosed and claimed in the Robert H. Hill application, Serial No. 169,490; filed lune 2l, 1950, or other conventional construction. As shown, cartridge neck 25 is threaded exteriorly to receive a closure fitting. 26.
  • the upper edge of the neck 25 has an upwardly extending annular portion providing a seat 27 against which is positioned a frangible disc 29 secured in position by threaded engagement of a ring nut 30 withthe interior surface of the tting 26.
  • the lower exterior surface of the tting 26 is formed with ilattened surfaces 31 or equivalent construction to be engaged by a wrench for the tightening of the tting on the cartridge 4.
  • the upper exterior surface of the tting 26 is threaded to engage with supporting means later to be described.
  • an orifice member 32 is secured within the passage in the neck 25 with the edge of the orifice member between the seat 27 and the frangible disc 29.
  • Thek perennial member 32 is disclosed and claimed in the Frank' B.
  • Allen application Serial No. 137,847', tiled Ianuary l0, 1950, and is made with a downwardly depending side wall 34 having a bottom surface apertured as inF dicated at 35.
  • the length of the downwardly depending surface is suicient to provide clearance with the pointed end Y22 of the puncturingmember ⁇ 5 after it has ruptured the disc 29.
  • the edge of the orifice member 32 is made of soft material so as to provide a seal between the seat 27 and the frangible disc 29.
  • the support for the cartridge 4 is electrical insulating or non-conducting means preferably in the form of a bushing member 40V adapted to be received in the open end of the downwardly depending portion 11.
  • the bushing 40 is ⁇ preferably made of a laminated fabric base phenolic resin impregnated molded tubing which is a good insulating material and, of course, is non-corrosive.
  • the bushing might be made of other electrical nonconducting material such as the synthetic resins, nylon, phenol-formaldehyde, urea-formaldehyde, Melamine, Teon, hard or synthetic rubber, and fiber glass, asbestos, or mica bonded with such synthetic resins, or porcelain, glass. or equivalent material.
  • the bushing is made with its upper end of one diameter while its lower end 41 is made of reduced diameter so that the bushing may be secured in position by turning in the lower end of the depending portion 11.
  • the depending portion 11 and the bushing 40V may be apertured to receive one or more pins 42 to prevent therotation of the bushing 40.
  • longitudinally extending grooves may be made in the bushing 40 to receive projections extending inwardly from the member 11, or any other suitable equivalent construction may be used to prevent the rotation of the bushing member 40 with respect to the member 11.
  • the internal surface of the bushing 40 is threaded to receive the closure fitting 26, a left-hand thread being used at this location while the iitting 26 is secured to the neck 25 of the cartridge 4 by the use of a right-hand thread.
  • the threaded connection may be made tight because of the resiliency of the insulating material, thus, the threads of the cartridge are protected against corrosion.
  • the axial length of the bushing 4 0 is such as to prevent contact between the upper end of the closure fitting 26 and the lower surface of the discharge head 3 so that electrical contact is prevented therebetween,
  • the extinguisher 1 In the operation of the extinguisher 1 it is inverted and the cap memberstruck against a surface to push the pointed end 22 of the puncturing member 5 through the frangible disc 29 so as to release the pressurizing iiuid from cartridge 4.
  • the pressurizing uid is metered bythe orifice member 32 and ows through the opening in the ruptured disc 29 and outwardly through the venting passages 12 to pressurize the liquid in the extinguisher to expel it through the outlet elbow 6 and discharge hose 7.
  • FIG. 2 Another embodiment of the invention is shown in Figure 2 in which corresponding parts are designated by the same reference numerals as in Figures 1-4 with the addition of 200.
  • the extinguisher 201 diiers primarily from the extinguisher 1 in that the discharge head 203 has been converted from the soda-acid type extinguisher head to a water pressurized extinguisher by the use of a conversion unit such as is described and claimed in my co-pending application, Serial No. 248,110, filed September 25, 1951.
  • the conventional combination discharge head and carrying handle 203 is drilled in the center of its closure surface to receive a unitary assemblv including the puncturing means and the support for the cartridge 204.
  • the exterior surface of the upwardlv extending portion 214 is threaded to receive a ring nut 250, a gasket 251 being interposed between the under side of the discharge head 203 and a shoulder 252 formed by the downwardly depending portion 211.
  • the bushing member 240 is made of non-conducting electrical material as in the case of the bushing 40.
  • the body of the conversion unit is made of an electrical nonconducting material of the same or equivalent material. as is used for the bushing member 240. In this event the bushing member may be made of either conducting or non-conducting material.
  • FIG 3 another embodiment of the invention is illustrated in which corresponding parts are designated by the same reference numerals as in Figurev 1 with the addition of 300.
  • the container and cartridge have been omitted for simplicity of illustration, this construction differing primarily from that shown in Figure 2 in that the bushing 340 is made of metal while the gasket 351 and the name plate disc 354 are made of an electrical non-conducting material as previously described.
  • the opening in the discharge head 303 is made somewhat larger than in the extinguisher shown in Figure 2 so that the packing material 351 prevents contact between the metal of the discharge head 303 and the body 314 for the puncturing member.
  • electrical contact is prevented between the body 314 which is adapted to be in electrical contact with the iiuid container of the extinguisher and the cartridge extending into the fluid.
  • FIG. 4 Still another embodiment of the invention is illustrated in Figure 4 in which corresponding parts are designated by the same reference numerals as in Figure l with the addition of 400.
  • the body of the container and the cartridge have been omitted for simplicity of illustration.
  • This embodiment differs primarily from those previously described in the construction of the insulating means between the cartridge supporting bushing 440 and the discharge head 403.
  • the puncturing member body 414 has its lower end 460 of reduced diameter and threaded on its exterior surface.
  • An L-shaped insulating bushing 461 has both its interior and exterior surface threaded and is adapted to be received over the reduced portion 460 and to coact with a gasket 462 made of insulating material and adapted to overlie the upper surface of the bushing 440 so as to prevent electrical contact between the bushing 440 and the discharge head 403.
  • the cartridge supporting means or bushing 440 may be made of metal with its inner surface threaded to engage with the outer threaded surface of the bushing 461.
  • a tire extinguisher of the type used for dispensing an electrically conductivey ire extinguishing lagent including a metal container for the re extinguishing agent, a metal cartridge for stored pressure medium for expelling the re extinguishing agent, a metallic closure member for the container, and supporting means for the cartridge relative to the container located on the underside of the closure member and positioning the c-artridge exposed to contact with the conductive re extinguishing agent stored in the container, the improvement wherein an electrical insulating bushing is incorporated in the supporting means preventing the ow of g-alvanic current through the supporting means, whereby corrosion of the cartridge is minimized.
  • a fire extinguisher comprising a metallic container yfor extinguishing uid, a metallic closure member for the container, a metallic cartridge for pressurizing fluid to expel the extinguishing uid from the container, supporting means for the cartridge separable from the closure member, the cartridge threadedly engaged with the supporting means, and insulating material positioned between the supporting means and the metallic closure member.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
US248111A 1951-09-25 1951-09-25 Fire extinguisher Expired - Lifetime US2702600A (en)

Priority Applications (2)

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IT500420D IT500420A (en]) 1951-09-25
US248111A US2702600A (en) 1951-09-25 1951-09-25 Fire extinguisher

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US248111A US2702600A (en) 1951-09-25 1951-09-25 Fire extinguisher

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767797A (en) * 1951-09-25 1956-10-23 Fyr Fyter Co Fire extinguisher adapter
US2908334A (en) * 1957-03-14 1959-10-13 Union Carbide Corp Process and apparatus for generating and discharging foam
US2967571A (en) * 1959-02-24 1961-01-10 Fyr Fyter Co Fire extinguisher with insulated pump
US3817297A (en) * 1971-08-20 1974-06-18 H King Reusable aerosol dispenser
DE2749255A1 (de) * 1976-11-04 1978-05-11 Sugimura Speichervorrichtung mit einem trennelement zwischen einer gaskammer und einer fluessigkeitskammer
US4737320A (en) * 1985-01-28 1988-04-12 Rothschild Bertram P Carbonating head
WO1992022404A3 (en) * 1991-06-11 1993-05-27 Michael Edward Brown Liquid injector
US5485872A (en) * 1993-07-12 1996-01-23 Luxembourg Patent Company S.A. Device for closing a non-refillable bottle, and adaptors for filling and draining through such a device
US5732752A (en) * 1996-04-04 1998-03-31 Glessner; Glen R. Method and apparatus for the automatic release of a gas from a pressurized cartridge
US5957162A (en) * 1997-07-09 1999-09-28 Nippon Pneumatics Pressure accumulator system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB245999A (en) * 1925-05-12 1926-01-21 Fred Thomas Matthews An improved fire extinguisher
US1976467A (en) * 1933-08-11 1934-10-09 Bell Telephone Labor Inc Fire extinguisher

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB245999A (en) * 1925-05-12 1926-01-21 Fred Thomas Matthews An improved fire extinguisher
US1976467A (en) * 1933-08-11 1934-10-09 Bell Telephone Labor Inc Fire extinguisher

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767797A (en) * 1951-09-25 1956-10-23 Fyr Fyter Co Fire extinguisher adapter
US2908334A (en) * 1957-03-14 1959-10-13 Union Carbide Corp Process and apparatus for generating and discharging foam
US2967571A (en) * 1959-02-24 1961-01-10 Fyr Fyter Co Fire extinguisher with insulated pump
US3817297A (en) * 1971-08-20 1974-06-18 H King Reusable aerosol dispenser
DE2749255A1 (de) * 1976-11-04 1978-05-11 Sugimura Speichervorrichtung mit einem trennelement zwischen einer gaskammer und einer fluessigkeitskammer
US4143678A (en) * 1976-11-04 1979-03-13 Nobuyuki Sugimura Bladder type accumulator housing a gas bombe in its gas chamber
US4737320A (en) * 1985-01-28 1988-04-12 Rothschild Bertram P Carbonating head
WO1992022404A3 (en) * 1991-06-11 1993-05-27 Michael Edward Brown Liquid injector
US5485872A (en) * 1993-07-12 1996-01-23 Luxembourg Patent Company S.A. Device for closing a non-refillable bottle, and adaptors for filling and draining through such a device
US5732752A (en) * 1996-04-04 1998-03-31 Glessner; Glen R. Method and apparatus for the automatic release of a gas from a pressurized cartridge
US5957162A (en) * 1997-07-09 1999-09-28 Nippon Pneumatics Pressure accumulator system

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