US3621841A - Foldable protective head enclosure - Google Patents

Foldable protective head enclosure Download PDF

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Publication number
US3621841A
US3621841A US37135A US3621841DA US3621841A US 3621841 A US3621841 A US 3621841A US 37135 A US37135 A US 37135A US 3621841D A US3621841D A US 3621841DA US 3621841 A US3621841 A US 3621841A
Authority
US
United States
Prior art keywords
window
cover
opening
tube
breathing tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US37135A
Other languages
English (en)
Inventor
Harry W Austin
John C Miller
Rutherford B Snyder Jr
John W Neidhart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MSA Safety Inc
Original Assignee
Mine Safety Appliances Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mine Safety Appliances Co filed Critical Mine Safety Appliances Co
Application granted granted Critical
Publication of US3621841A publication Critical patent/US3621841A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B17/00—Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes
    • A62B17/006—Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes against contamination from chemicals, toxic or hostile environments; ABC suits
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B17/00—Protective clothing affording protection against heat or harmful chemical agents or for use at high altitudes
    • A62B17/04—Hoods
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/04—Gas helmets

Definitions

  • a protective hood for the head has a front window formed from a sheet of flexible plastic provided with a central outlet opening in front of the mouth and inlet openings at each side of the central opening. Secured to the window is an outlet valve surrounded by a breathing tube that extends rearwardly for insertion in the mouth. Each inlet opening is closed by a filter, and a cover has an upright body spaced behind the filters and valve and also has forwardly extending walls sealed to the inner surface of the window around the openings as a group.
  • This cover body is provided with an opening through which the breathing tube extends, and the tube has a lateral inlet opening between the cover body and the window for establishing communication between the inside of the tube and the air duct formed by the cover.
  • the tube opening in the cover it has hinged portions to permit the cover and window to be folded rearwardly on opposite sides of the breathing tube when not in use.
  • a protective head enclosure in which a hood also serves as a breathing mask, and in which the hood and the breathing components attached to it can be folded when not in use.
  • FIG. 1 is a front view of the head enclosure
  • FIG. 2 is a side view
  • FIG. 3 is an enlarged horizontal section of the front of the enclosure, but showing it in a flat plane;
  • FIG. 4 is a fragmentary inside or rear view of the front of the enclosure.
  • FIGS. 5 and 6 are enlarged vertical sections taken on the lines V-V and Vii-VI, respectively, of FIG. 4.
  • a hood 1 formed to surround the head is formed from flexible impervious material, preferably aluminized nylon film.
  • the bottom of the hood may be designed to be sealed around the neck or it may be sealed to the collar of a complete protective suit.
  • the front of the hood is provided with a large and generally rectangular opening 2 that is covered by a sheet of transparent plastic 3 sealed 3,6Zl,84l Patented Nov. 23, 1971 to the wall of the opening. This window gives good visibility to the'person wearing the hood.
  • the window is provided with an outlet opening 4 that is located in front of the mouth of the wearer. It also is provided with an inlet opening 5 a each side of this central opening. Mounted in the central opening is an outlet valve that includes a flanged cup 6 sealed to the wall of the opening. The back of the cup has several spaced holes in it that are normally closed by a flexible rubber disc 7, the central portion of which is anchored in the cup. Air can pass outwardly through the valve but not inwardly.
  • a breathing tube 9 Surrounding this valve is the large front end of a breathing tube 9.
  • the rear portion of the tube is reduced in height materially to form an oval portion that can be held in the month by means of a conventional resilient bitepiece 10 mounted on the tube.
  • a conventional resilient bitepiece 10 mounted on the tube.
  • the nose may be closed by a separate clamp, it is preferred to close it with a resilient clip '11 (FIG. 5) integral with a post 12, the lower end of which surrounds the breathing tube in front of the bitepiece.
  • the tube therefore holds the clip in position when the bitepiece is in the mouh.
  • Each of the inlet openings 5 in the window is closed by a filter. This preferably is done by mounting the filter 14 in a case 15 that fits snugly in the inlet opening.
  • the front of the case is open to receive the filter, but the back of the case inside the hood is closed except for a port or two that are closed during exhalation by a rubber flap 16 supported by studs 17 projecting from the back of the case, as shown in FIGS. 3, '4 and 6.
  • Visibility through the window can be improved by making the inlet openings and the filter cases substantially in the form of right triangles, with one leg of each triangle at the bottom and substantially horizonal, and wih the hypotenuse inclined upwardly and outwardly from the inner end of the bottom leg. As shown in FIG. 1, this provides more space between the tops of the filters than between their bottoms.
  • a lateral inlet opening 19 at each side of the outlet valve. Air entering the hood from the filters is confined in a duct that communicates with these openings.
  • This duct is formed between the window and the upright body 20 of a cover spaced behind the filters and valve and having forwardly extending peripheral walls 21 surrounded by integral flanges 22 sealed to the inner surface of the window around the group of three openings therein.
  • the cover is provided with an opening 23, through which the reduced rear portion of the breathing tube 9 extends and in which it is sealed. The cover also serves to hold the breathing tube in position around the outlet valve.
  • the window 3 can be folded upon itself against the opposite sides of the breathing tube to reduce the width of the window by nearly half.
  • the cover that forms the air duct has hinge portions at opposite sides of the tube so that the cover can be folded rearwardly with the window.
  • the hinge portions may be formed by molding crimps into the cover at opposite sides of the breathing tube.
  • the upright body 20 of the cover is provided with forwardly directed crimps 25 extending from top to bottom of it.
  • each crimp meet at substantially a right angle along their front edges, and that is the point or line along which the hinging occurs. Also, to prevent the upper and lower peripheral walls 21 of the cover from interfering with folding of the cover, they are provided with vertically directed crimps 26 at the upper and lower ends of the other crimps 25. Consequently, although the cover normally is a stitf member, it can be folded at the crimps when desired and this permits the head gear to be flattened to take up less room when not in use.
  • a protective head enclosure comprising a flexible hood adapted to totally enclose the head of a user, said hood having a window formed from a sheet of flexible transparent plastic, the window being provided with a central outlet opening, the window also having inlet openings at each side of the outlet opening, an outlet valve for the outlet opening secured to the window, a breathing tube surrounding said outlet valve and extending in teriorly therefrom for insertion in the mouth, a filter closing each inlet opening, and a relatively rigid cover means spaced behind said filters and outlet valve and having forwardly extending peripheral walls sealed to the inner surface of the window around said inlet and outlet openings to form an air duct, said cover means being provided with an aperture receiving the breathing tube, said tube having a lateral innlet passageway between said cover means and window establishing communication between the inside of the tube and said duct, and the cover means having substantially vertical hinge portions at opposite sides of said aperture to permit the cover means and window to be folded on opposite sides of the breathing tube when not in use.
  • each of said hinge portions of the cover means includes a forwardly directed crimp extending from top to bottom of said cover means.
  • each of said hinge portions of the cover means includes a forwardly directed crimp extending from top to the bottom of said cover means, and vertically directed crimps in said peripheral walls at the upper and lower ends of said first-mentioned crimp.
  • a protective head enclosure including filter cases extending interiorly from said inlet openings and containing said filters, said cases being sealed against the window and provided in their backs with ports, and inlet valves carried by the cases for closing said ports during exhalation.
  • a protective head enclosure including a bitepiece mounted on the interior end of the breathing tube, and a nose clip mounted on said tube and extending upwardly therefrom for closing the nose.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Toxicology (AREA)
  • Pulmonology (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
US37135A 1970-05-14 1970-05-14 Foldable protective head enclosure Expired - Lifetime US3621841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3713570A 1970-05-14 1970-05-14

Publications (1)

Publication Number Publication Date
US3621841A true US3621841A (en) 1971-11-23

Family

ID=21892617

Family Applications (1)

Application Number Title Priority Date Filing Date
US37135A Expired - Lifetime US3621841A (en) 1970-05-14 1970-05-14 Foldable protective head enclosure

Country Status (2)

Country Link
US (1) US3621841A (de)
DE (1) DE2121308C3 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789839A (en) * 1971-06-29 1974-02-05 Civilforsvarsstyrelsen Covering for protecting head and face from dangerous aerosols and gases
EP0124994A2 (de) * 1983-04-01 1984-11-14 Toyo Cci Kabushiki Kaisha Notmaske
US4484575A (en) * 1983-01-13 1984-11-27 E. D. Bullard Company Loose fitting supplied air respirator hood
US4630604A (en) * 1985-04-09 1986-12-23 Siebe North, Inc. Valve assembly for a replaceable filter respirator
GB2294882A (en) * 1994-11-11 1996-05-15 Warrick Ian Gorman Self rescuer apparatus
WO2003099385A1 (en) * 2002-05-29 2003-12-04 Templeton Randall D Respirator hood assembly
WO2005021096A1 (en) * 2003-09-01 2005-03-10 The Secretary Of State For Defence An oro-nasal mask
WO2007042754A1 (en) * 2005-10-13 2007-04-19 Avon Polymer Products Limited Respirator
WO2009044131A2 (en) * 2007-10-05 2009-04-09 Avon Polymer Products Limited Filtration mask
US8887719B2 (en) 2011-12-15 2014-11-18 3M Innovative Properties Company Air filtration device having tuned air distribution system
US8899227B2 (en) 2011-12-15 2014-12-02 3M Innovative Properties Company Air filtration device having subsections lacking fluid communication

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831664A (en) * 1987-05-14 1989-05-23 Redi-Corp Protective Materials, Inc. Garment for protecting against environmental contamination

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789839A (en) * 1971-06-29 1974-02-05 Civilforsvarsstyrelsen Covering for protecting head and face from dangerous aerosols and gases
US4484575A (en) * 1983-01-13 1984-11-27 E. D. Bullard Company Loose fitting supplied air respirator hood
EP0124994A2 (de) * 1983-04-01 1984-11-14 Toyo Cci Kabushiki Kaisha Notmaske
EP0124994A3 (en) * 1983-04-01 1985-11-06 Toyo Cci Kabushiki Kaisha Emergency mask
US4677976A (en) * 1983-04-01 1987-07-07 Toyo Cci Kabushiki Kaisha Emergency mask
US4630604A (en) * 1985-04-09 1986-12-23 Siebe North, Inc. Valve assembly for a replaceable filter respirator
GB2294882A (en) * 1994-11-11 1996-05-15 Warrick Ian Gorman Self rescuer apparatus
US7210477B2 (en) 2002-05-29 2007-05-01 Brookdale International Systems, Inc. Respirator hood assembly
WO2003099385A1 (en) * 2002-05-29 2003-12-04 Templeton Randall D Respirator hood assembly
US20040003810A1 (en) * 2002-05-29 2004-01-08 Templeton Randall D. Respirator Hood Assembly
WO2005021096A1 (en) * 2003-09-01 2005-03-10 The Secretary Of State For Defence An oro-nasal mask
GB2419822A (en) * 2003-09-01 2006-05-10 Secr Defence An oro-nasal mask
US20070107732A1 (en) * 2003-09-01 2007-05-17 Dennis Michael R Oro-nasal mask
GB2419822B (en) * 2003-09-01 2008-03-05 Secr Defence An oro-nasal mask
US20090217926A1 (en) * 2005-10-13 2009-09-03 Avon Polymer Products Limited Respirator
WO2007042754A1 (en) * 2005-10-13 2007-04-19 Avon Polymer Products Limited Respirator
AU2006301001B2 (en) * 2005-10-13 2011-03-03 Avon Polymer Products Limited Respirator
WO2009044131A3 (en) * 2007-10-05 2009-06-04 Avon Polymer Prod Ltd Filtration mask
US20110011404A1 (en) * 2007-10-05 2011-01-20 Avon Polymer Products Limited Filtration mask
WO2009044131A2 (en) * 2007-10-05 2009-04-09 Avon Polymer Products Limited Filtration mask
US8590532B2 (en) 2007-10-05 2013-11-26 Avon Polymer Products Limited Filtration mask
US8887719B2 (en) 2011-12-15 2014-11-18 3M Innovative Properties Company Air filtration device having tuned air distribution system
US8899227B2 (en) 2011-12-15 2014-12-02 3M Innovative Properties Company Air filtration device having subsections lacking fluid communication
US9744329B2 (en) 2011-12-15 2017-08-29 3M Innovative Properties Company Air filtration device having subsections lacking fluid communication
US9744328B2 (en) 2011-12-15 2017-08-29 3M Innovative Properties Company Air filtration device having tuned air distribution system

Also Published As

Publication number Publication date
DE2121308B2 (de) 1973-11-08
DE2121308A1 (de) 1971-11-25
DE2121308C3 (de) 1974-06-20

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