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US3818508A - Protective headgear - Google Patents

Protective headgear Download PDF

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Publication number
US3818508A
US3818508A US00317966A US31796672A US3818508A US 3818508 A US3818508 A US 3818508A US 00317966 A US00317966 A US 00317966A US 31796672 A US31796672 A US 31796672A US 3818508 A US3818508 A US 3818508A
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United States
Prior art keywords
liner
outer shell
protective headgear
shell
head
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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
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US00317966A
Inventor
P Lammers
F Stefan
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Goodyear Tire and Rubber Co
Original Assignee
Goodyear Tire and Rubber Co
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Filing date
Publication date
Application filed by Goodyear Tire and Rubber Co filed Critical Goodyear Tire and Rubber Co
Priority to US00317966A priority Critical patent/US3818508A/en
Priority to CA187,284A priority patent/CA1018301A/en
Priority to GB5752773A priority patent/GB1420703A/en
Priority to DE2362325A priority patent/DE2362325A1/en
Application granted granted Critical
Publication of US3818508A publication Critical patent/US3818508A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/10—Linings
    • A42B3/12—Cushioning devices
    • A42B3/121—Cushioning devices with at least one layer or pad containing a fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S2/00—Apparel
    • Y10S2/903—Fiberglass

Definitions

  • ABSTRACT A protective headgear characterized by microporous semi-flexible polyurethane outer shell and a soft, flexible cellular liner, the outer shell having a density of about 30 to 42 pounds per cubic foot and a deflection test (Z-90 impact) of one inch at about one to 5 pound load and a temperature of 75F.
  • This invention relates to a nonrigid protective headgear. More particularly, it relates to helmets and the method of construction.
  • protective headgear has traditionally been used to cover helmets and related protective devices for use in protecting vehicular riders such as motorcycle, automobile and motor bike riders. Also, it has been used to cover the devices used in sports, such as baseball, football and hockey, and in the military service for protecting people in the Air Force, Navy and Army.
  • the protective headgear traditionally has comprised these elements, the first being a rigid outer shell; second, a soft head-contacting liner therein, with a means such as a strap sling to adjust the liner to fit the contour of the wearers head; and third, an anchor means for anchoring the outer shell with the inner strap sling liner on the wearers head, this being traditionally a chin strap device.
  • the protective headgear has almost universally been comprised of a rigid outer shell member and this rigid outer shell member in some embodiments could extend outward over the face in a bill-like projection or in other embodiments could extend down in the back like a tail to protect the wearers neck.
  • this rigid outer shell member in some embodiments could extend outward over the face in a bill-like projection or in other embodiments could extend down in the back like a tail to protect the wearers neck.
  • the protective headgear has been used extensively for ages it has had a number of drawbacks, one of the principal ones being that the outer shell was rigid and had to depend on the inner sling liner or undershell and the means for adjusting the sling liner to distribute the impact to the wearers head.
  • the rigid outer shell was able to function as a sound deadener or as an insulator from heat.
  • the outer shell be able to act as a sound or noise deadener.
  • An object of this invention is to provide a protective headgear wherein the outer shell is nonrigid and is capable of acting as an energy absorber through compression of itself as well as a noise absorber and a heat insulating means.
  • a further object is to provide a protective headgear that is lighter in weight than that normally obtained with the rigid outer shell member.
  • FIG. 1 is a perspective view in side elevation with a portion cut away to show one embodiment of the shell liner relationship and FIG. 2 is a front view in elevation without the chin strap.
  • the outer shell 5 is shown as having an enlarged area or flange 6 near the outer edge of the outer shell.
  • This enlarged rounded flange member functions in the capacity of imparting greater strength to the outer shell and also, since it is semi-flexible, permits the distribution of any unusual loads in contact with the neck to be more readily distributed.
  • a head contacting liner which can be both a flexible soft foam, cork, etc., liner and a strap means, viz., an adjustable head band 8 for adjusting the fit of the liner to the wearers head and this means for adjusting the fit of the liner to the wearers head may be any of the well-known devices for achieving this, such as straps or headbands.
  • the means for anchoring the protective headgear on the wearer is riveted or otherwise attached to or through the outer shell and extends down and to a means such as a slip buckle 10 that may be fastened or unfastened or adjusted whereby the protective headgear can be fastened under the chin of the wearer.
  • the outer shell has been described as being nonrigid and semi-flexible in nature. Also, the outer shell is usu- V ally smooth but this smoothness may be varied to give a decorative or more aesthetic design to the helmet as described above in regard to the flange around the outer extremity.
  • the outer shell may be formed by pouring a liquid foamable polyurethane reaction mixture into a mold having the contour of the outer shell to form a porous semi-rigid outer shell member. This outer shell member may be removed from the mold and the head contacting liner placed therein. The liner may be secured to the outer shell in any of the well-known manners, for instance, by riveting, bolting or adhesively adhering thereto.
  • EXAMPLE I A polyester fiberglass helmet shell mold of the helmet type shown in FIG. 1 was assembled and given a coating of a polyethylene mold release agent. Then the cavity of the shell mold was charged with sufficient amount of a liquid foamable polyurethane reaction mixture to fill the mold and preferably develop a slight positive pressure, usually approximately 0.5 to 45 pounds per square inch during the foaming of the mixture. The charge in the mold is let stand until cured, usually about 15 to 60 minutes if at elevated temperature, but if at room temperature a longer time may pass before opening the mold and stripping out the semiflexible microporous shell.
  • the shell is desirably given a decorative coat of an elastomeric paint to give the shell the desired color and appearance.
  • the liquid foamable polyurethane mixture' is dyed or pigmented to eliminate the need to paint the shell.
  • the shell can be bored or punched to provide the bolt or rivet holes 11.
  • the soft liner can be prepared bypouring a soft flexible polyurethane reaction mixture in the liner mold and allowing it to foam and cure. This liner is placed in the shell and preferably adhered therein by use of a thin layer of the flexible polyurethane reaction mixture as an adhesive.
  • the soft liner can be made by theuse of any of the well-known soft flexible polyurethane reaction mixtures that give a foam of about 2.5 to 20 pounds per cubic foot in density and a compression set of to percent by ASTM Method 2204.
  • the semi-flexible foam for the outer shell was made by mixing in an Admiral Foam Machine the following recipe:
  • Preblended resin 100 parts Triethylene diamine 0.07 part Dibutyl tin dilaurate 0.10 part Quadrol 8.0 parts Water 0.35 art diethylene glycol. Foams of this type have a density of about 30 to 55 pounds per cubic foot.
  • the soft, flexible helmet liner foams were made by mixing the ingredients on an Admiral Foam Machine using the following recipe:
  • “Mondur MRS is a Crude polymeric isocyunatc of methane di( phenyl isocynnate) i.c. MD] of approx imatcly 40 percent 4.4-MD1, percent 2.4-MDl and 50 percent trifunctional higher analogues of 2.4- and 4,4-MD1.
  • Polyurethane reaction mixtures that yield microporous polyurethanes of about 30 to 42 pounds per cubic foot, Shore A hardness of 80 to 100, puncture resistance of 60 to 100 pounds, hammer cold crease resistance to 40F. and exhibit a 1-inch deflection under loads of about 1 to 5 pounds at 75 F. and 5 to 10 pounds at l4F. are satisfactory for the shell of this invention.
  • the puncture test measures the resistance in pounds to the penetration of a push of one-eighth inch diameter flat head pin type through a one-fourth inch thick sample.
  • the hammer crease test is run at decreasing cold temperature at 10F. intervals until the sample fails under hammer impact.
  • the deflection test (Z-90 impact) is' run usually at 75F. and l4F. and the amount of deflection of a inch X 1 inch X 6 inch strip when suspended on a 4 inch span on a load is applied at the center to effect a deflection which is recorded as the inches of deflection at the specified
  • a polystyrene foam head member 12 is positioned inside the liners 7 to adjust the liner to the contour of the wearers head. It is preferred that this polystyrene foam head member have a compression set of at least 90 to l00'percent. Also, the polystyrene foam head member 12 is covered with a soil preventing member 13, usually of fabric such as nylon, polyester 0r cellulose types. The soil preventing member 13 can be used to give the helmet varying sizes in the manner customarily achieved by stuffing behind a headband.
  • any of the well known polyurethane reaction mixtures that yield microporous polyurethane or foams having compression set of to 100 percent at 2.5 to 20 pounds per cubic foot can be used.
  • the impact resistance of the microporous polyurethane can be varied readily by use of a trito hem-functional crosslinker as the curative in about 0.5 to 1.0 mole per mole of excess organic poly isocyanate.
  • the organic polyisocyanate is used in excess relative to the polyester or polyether and usually about 1.5 to 3.5 moles per mole.
  • the ingredients useful in making polyurethane reaction mixtures are well i1- lustrated in US. Pat. No. 3,680,329.
  • a protective headgear adapted to protect the head, comprising a microporous semi-flexible polyurethane outer shell, a head-contacting liner within the shell ofa soft, flexible cellular material, said liner having means to adjust the liner to fit the contour of the wearers head, said outer shell having a density of about 30 to 42 pounds per cubic foot and a deflection test (Z- impact) of 1 inch at about 1 to 5 pound load and a temperature of 75F.
  • the headgear of claim 1 in which the means to adjust the liner comprises a band secured to the liner.

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  • Helmets And Other Head Coverings (AREA)

Abstract

A protective headgear characterized by microporous semi-flexible polyurethane outer shell and a soft, flexible cellular liner, the outer shell having a density of about 30 to 42 pounds per cubic foot and a deflection test (Z-90 impact) of one inch at about one to 5 pound load and a temperature of 75*F.

Description

United States Patent 191 Lammers et a1.
[ PROTECTIVE HEADGEAR [75] Inventors: Peter C. Lammers, Doylestown;
Frank N. Stefan, Akron, both of Ohio [73] Assignee: The Goodyear Tire & Rubber Company, Akron, Ohio [22] Filed: Dec. 26, 1972 [21] Appl. No.: 317,966
[52] U.S. Cl 2/3 R [51] Int. Cl A42b 3/00 [58] Field of Search 2/3 R, 3 A, 3 B, 3 C, 5, 2/6;161/159,160,190
[56] References Cited UNITED STATES PATENTS 3,186,004 6/1965 Carline 2/3 R [4 1 June 25, 1974 3,242,500 3/1966 Derr 2/3 R 3,365,725 1/1968 Webb 2/3 R 3,447,163 6/1969 3,501,772 3/1970 3,616,463 11/1971 Theodore et a1 2/3 R Primary Examiner-James R. Boler Assistant ExaminerWai M. Chan Attorney, Agent, or Firm-F. W. Brunner; J. D. Wolfe [57] ABSTRACT A protective headgear characterized by microporous semi-flexible polyurethane outer shell and a soft, flexible cellular liner, the outer shell having a density of about 30 to 42 pounds per cubic foot and a deflection test (Z-90 impact) of one inch at about one to 5 pound load and a temperature of 75F.
3 Claims, 2 Drawing Figures This invention relates to a nonrigid protective headgear. More particularly, it relates to helmets and the method of construction. The term protective headgear has traditionally been used to cover helmets and related protective devices for use in protecting vehicular riders such as motorcycle, automobile and motor bike riders. Also, it has been used to cover the devices used in sports, such as baseball, football and hockey, and in the military service for protecting people in the Air Force, Navy and Army. The protective headgear traditionally has comprised these elements, the first being a rigid outer shell; second, a soft head-contacting liner therein, with a means such as a strap sling to adjust the liner to fit the contour of the wearers head; and third, an anchor means for anchoring the outer shell with the inner strap sling liner on the wearers head, this being traditionally a chin strap device.
Heretofore, the protective headgear has almost universally been comprised of a rigid outer shell member and this rigid outer shell member in some embodiments could extend outward over the face in a bill-like projection or in other embodiments could extend down in the back like a tail to protect the wearers neck. In some instances it has been desirable that some embodiments of the outer shell be shaped to permit ear phones or like special apparatus to be fitted in or on the shell.
Although the protective headgear has been used extensively for ages it has had a number of drawbacks, one of the principal ones being that the outer shell was rigid and had to depend on the inner sling liner or undershell and the means for adjusting the sling liner to distribute the impact to the wearers head.
Also, the rigid outer shell was able to function as a sound deadener or as an insulator from heat. Thus, where the helmet is to be worn on a motorcycle or around aircraft it is very desirable that the outer shell be able to act as a sound or noise deadener.
An object of this invention is to provide a protective headgear wherein the outer shell is nonrigid and is capable of acting as an energy absorber through compression of itself as well as a noise absorber and a heat insulating means. A further object is to provide a protective headgear that is lighter in weight than that normally obtained with the rigid outer shell member.
In the accompanying drawings wherein FIG. 1 is a perspective view in side elevation with a portion cut away to show one embodiment of the shell liner relationship and FIG. 2 is a front view in elevation without the chin strap.
In the drawing, the outer shell 5 is shown as having an enlarged area or flange 6 near the outer edge of the outer shell. This enlarged rounded flange member functions in the capacity of imparting greater strength to the outer shell and also, since it is semi-flexible, permits the distribution of any unusual loads in contact with the neck to be more readily distributed. Resting within the outer shell is a head contacting liner which can be both a flexible soft foam, cork, etc., liner and a strap means, viz., an adjustable head band 8 for adjusting the fit of the liner to the wearers head and this means for adjusting the fit of the liner to the wearers head may be any of the well-known devices for achieving this, such as straps or headbands. Also, it should be noted that the means for anchoring the protective headgear on the wearer is riveted or otherwise attached to or through the outer shell and extends down and to a means such as a slip buckle 10 that may be fastened or unfastened or adjusted whereby the protective headgear can be fastened under the chin of the wearer.
The outer shell has been described as being nonrigid and semi-flexible in nature. Also, the outer shell is usu- V ally smooth but this smoothness may be varied to give a decorative or more aesthetic design to the helmet as described above in regard to the flange around the outer extremity. The outer shell may be formed by pouring a liquid foamable polyurethane reaction mixture into a mold having the contour of the outer shell to form a porous semi-rigid outer shell member. This outer shell member may be removed from the mold and the head contacting liner placed therein. The liner may be secured to the outer shell in any of the well-known manners, for instance, by riveting, bolting or adhesively adhering thereto.
The nature of this invention can more readily be appreciated and understood by reference to the following exemplary and representative examples where all parts and percentages are by weight unless otherwise indicated.
EXAMPLE I A polyester fiberglass helmet shell mold of the helmet type shown in FIG. 1 was assembled and given a coating of a polyethylene mold release agent. Then the cavity of the shell mold was charged with sufficient amount of a liquid foamable polyurethane reaction mixture to fill the mold and preferably develop a slight positive pressure, usually approximately 0.5 to 45 pounds per square inch during the foaming of the mixture. The charge in the mold is let stand until cured, usually about 15 to 60 minutes if at elevated temperature, but if at room temperature a longer time may pass before opening the mold and stripping out the semiflexible microporous shell.
The shell is desirably given a decorative coat of an elastomeric paint to give the shell the desired color and appearance. Alternately, the liquid foamable polyurethane mixture'is dyed or pigmented to eliminate the need to paint the shell. Also, the shell can be bored or punched to provide the bolt or rivet holes 11.
The soft liner can be prepared bypouring a soft flexible polyurethane reaction mixture in the liner mold and allowing it to foam and cure. This liner is placed in the shell and preferably adhered therein by use of a thin layer of the flexible polyurethane reaction mixture as an adhesive. The soft liner can be made by theuse of any of the well-known soft flexible polyurethane reaction mixtures that give a foam of about 2.5 to 20 pounds per cubic foot in density and a compression set of to percent by ASTM Method 2204.
The semi-flexible foam for the outer shell was made by mixing in an Admiral Foam Machine the following recipe:
Preblended resin* 100 parts Triethylene diamine 0.07 part Dibutyl tin dilaurate 0.10 part Quadrol 8.0 parts Water 0.35 art diethylene glycol. Foams of this type have a density of about 30 to 55 pounds per cubic foot.
The soft, flexible helmet liner foams were made by mixing the ingredients on an Admiral Foam Machine using the following recipe:
Parts Resin 100 Water 1.5 Calcium stearate 3,0 Triethylene diamine 1.0 Stannous octoate 0.25 Mondur MRS 78.1
85/1 5 percent blend of a 4500 molecular weight ethylene oxide capped polypropylene ether triol and 400 molecular weight polypropylene oxide based sucrose polymer.
"Mondur MRS is a Crude polymeric isocyunatc of methane di( phenyl isocynnate) i.c. MD] of approx imatcly 40 percent 4.4-MD1, percent 2.4-MDl and 50 percent trifunctional higher analogues of 2.4- and 4,4-MD1.
Polyurethane reaction mixtures that yield microporous polyurethanes of about 30 to 42 pounds per cubic foot, Shore A hardness of 80 to 100, puncture resistance of 60 to 100 pounds, hammer cold crease resistance to 40F. and exhibit a 1-inch deflection under loads of about 1 to 5 pounds at 75 F. and 5 to 10 pounds at l4F. are satisfactory for the shell of this invention. The puncture test measures the resistance in pounds to the penetration of a push of one-eighth inch diameter flat head pin type through a one-fourth inch thick sample. The hammer crease test is run at decreasing cold temperature at 10F. intervals until the sample fails under hammer impact. The deflection test (Z-90 impact) is' run usually at 75F. and l4F. and the amount of deflection of a inch X 1 inch X 6 inch strip when suspended on a 4 inch span on a load is applied at the center to effect a deflection which is recorded as the inches of deflection at the specified load.
Referring to FIG. 1, it will be seen that in this embodiment'a polystyrene foam head member 12 is positioned inside the liners 7 to adjust the liner to the contour of the wearers head. It is preferred that this polystyrene foam head member have a compression set of at least 90 to l00'percent. Also, the polystyrene foam head member 12 is covered with a soil preventing member 13, usually of fabric such as nylon, polyester 0r cellulose types. The soil preventing member 13 can be used to give the helmet varying sizes in the manner customarily achieved by stuffing behind a headband.
Any of the well known polyurethane reaction mixtures that yield microporous polyurethane or foams having compression set of to 100 percent at 2.5 to 20 pounds per cubic foot can be used. Also, it should be appreciated that the impact resistance of the microporous polyurethane can be varied readily by use of a trito hem-functional crosslinker as the curative in about 0.5 to 1.0 mole per mole of excess organic poly isocyanate. The organic polyisocyanate is used in excess relative to the polyester or polyether and usually about 1.5 to 3.5 moles per mole. The ingredients useful in making polyurethane reaction mixtures are well i1- lustrated in US. Pat. No. 3,680,329.
While certain representative embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit or scope of the invention.
What is claimed is:
1. A protective headgear adapted to protect the head, comprising a microporous semi-flexible polyurethane outer shell, a head-contacting liner within the shell ofa soft, flexible cellular material, said liner having means to adjust the liner to fit the contour of the wearers head, said outer shell having a density of about 30 to 42 pounds per cubic foot and a deflection test (Z- impact) of 1 inch at about 1 to 5 pound load and a temperature of 75F.
2. The headgear of claim 1 in which the means to adjust the liner comprises a band secured to the liner.
3. The headgear of claim 1 wherein a polystyrene foam head member of 90 percent or more compression set is placed in the liner as the means to adjust the liner to fit the contour of the wearers head.

Claims (1)

  1. 2. The headgear of claim 1 in which the means to adjust the liner comprises a band secured to the liner. 3. The headgear of claim 1 wherein a polystyrene foam head member of 90 percent or more compression set is placed in the liner as the means to adjust the liner to fit the contour of the wearer''s head.
US00317966A 1972-12-26 1972-12-26 Protective headgear Expired - Lifetime US3818508A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00317966A US3818508A (en) 1972-12-26 1972-12-26 Protective headgear
CA187,284A CA1018301A (en) 1972-12-26 1973-12-04 Protective headgear
GB5752773A GB1420703A (en) 1972-12-26 1973-12-12 Protective headgear
DE2362325A DE2362325A1 (en) 1972-12-26 1973-12-14 PROTECTIVE HEADGEAR

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US00317966A US3818508A (en) 1972-12-26 1972-12-26 Protective headgear

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US3818508A true US3818508A (en) 1974-06-25

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GB (1) GB1420703A (en)

Cited By (57)

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JPS5178446A (en) * 1974-12-28 1976-07-08 Mizuno Kk YAKYUYO HERUMETSUTO
US4038700A (en) * 1975-06-12 1977-08-02 Gyoery Kalman Safety helmets for motorcyclists or the like
DE2724984A1 (en) * 1976-06-04 1977-12-08 Renault PROTECTIVE HELMET
US4064565A (en) * 1976-05-13 1977-12-27 Griffiths William S Helmet structure
US4075717A (en) * 1975-02-28 1978-02-28 Lemelson Jerome H Helmate
US4937888A (en) * 1988-05-31 1990-07-03 Straus Albert E Helmet cover
WO1990014025A1 (en) * 1989-05-23 1990-11-29 Frank Anthony Matich Crash helmet
US5724681A (en) * 1996-11-22 1998-03-10 Sykes; Bob Shock-absorbing helmet cover
US5887289A (en) * 1997-06-19 1999-03-30 Theoret; Normand Safety cap with removable fabric cover
WO1999049745A1 (en) * 1998-03-19 1999-10-07 Niels Dahl Protective helmet
US6101636A (en) * 1996-11-27 2000-08-15 Williams; Marix Sculptured helmet ornamentation
US6389607B1 (en) 2000-09-26 2002-05-21 James C. Wood Soft foam sport helmet
US6425141B1 (en) * 1998-07-30 2002-07-30 Cerebrix Protective helmet
US6453476B1 (en) * 2000-09-27 2002-09-24 Team Wendy, Llc Protective helmet
US20050217006A1 (en) * 2004-03-30 2005-10-06 Brad Sutter Protective helmet assembly having lightweight suspension system
US20050278835A1 (en) * 2002-05-01 2005-12-22 Ide Thad M Sports helmet
US20070220662A1 (en) * 2006-03-22 2007-09-27 Fox Racing, Inc. Molded articles and molding methods particularly for a protective helmet
US20080240775A1 (en) * 2007-03-27 2008-10-02 Brother Kogyo Kabushiki Kaisha Cartridge and Image Forming Apparatus
US20120317704A1 (en) * 2011-06-19 2012-12-20 Daniel Coyle Natural Fiber Helmet
US8640267B1 (en) 2012-09-14 2014-02-04 Yochanan Cohen Protective helmet
USD708395S1 (en) 2013-08-23 2014-07-01 Joey LaRocque Protective helmet
US20140259313A1 (en) * 2013-03-18 2014-09-18 Janet Alan Sullivan Protective Helmet
US8911015B2 (en) 2013-03-05 2014-12-16 Yochanan Cohen Car seat
US9289024B2 (en) 2007-04-16 2016-03-22 Riddell, Inc. Protective sports helmet
US9398783B2 (en) 2007-10-31 2016-07-26 Kranos Ip Corporation Helmet with shell having raised central channel and ear holes with abutting slopped banks
US9487110B2 (en) 2014-03-05 2016-11-08 Pidyon Controls Inc. Car seat
USD774257S1 (en) 2015-02-11 2016-12-13 Joey LaRocque Helmet
US9578917B2 (en) 2012-09-14 2017-02-28 Pidyon Controls Inc. Protective helmets
US9616782B2 (en) 2014-08-29 2017-04-11 Pidyon Controls Inc. Car seat vehicle connection system, apparatus, and method
US9756891B1 (en) 2015-06-11 2017-09-12 James Robb McGhie Apparatus for protecting the head of a person from an external force
US9763488B2 (en) 2011-09-09 2017-09-19 Riddell, Inc. Protective sports helmet
US9788591B2 (en) 2007-04-16 2017-10-17 Riddell, Inc. Quick release connector
US9943129B2 (en) 2015-04-06 2018-04-17 Cascade Maverik Lacrosse, Llc Protective headgear
US20180192730A1 (en) * 2015-07-07 2018-07-12 Headkayse Ltd. A Helmet
US10143256B2 (en) 2016-01-29 2018-12-04 Aes R&D, Llc Protective helmet for lateral and direct impacts
US10150389B2 (en) 2013-03-05 2018-12-11 Pidyon Controls Inc. Car seat and connection system
USD838922S1 (en) 2011-05-02 2019-01-22 Riddell, Inc. Football helmet
US10220734B2 (en) 2013-03-05 2019-03-05 Pidyon Controls Inc. Car seat
US10226094B2 (en) 2016-01-29 2019-03-12 Aes R&D, Llc Helmet for tangential and direct impacts
USD844255S1 (en) 2014-02-12 2019-03-26 Riddell, Inc. Football helmet
US10362829B2 (en) 2013-12-06 2019-07-30 Bell Sports, Inc. Multi-layer helmet and method for making the same
USD856601S1 (en) 2011-05-02 2019-08-13 Riddell, Inc. Football helmet
US10531698B2 (en) 2016-05-06 2020-01-14 Hummingbird Sports, Llc Soft athletic helmet and rear closure mechanism
US10582737B2 (en) 2013-02-12 2020-03-10 Riddell, Inc. Football helmet with impact attenuation system
US10721987B2 (en) 2014-10-28 2020-07-28 Bell Sports, Inc. Protective helmet
US10905936B2 (en) 2013-08-02 2021-02-02 Riddell, Inc. Sports helmet with adjustable chin strap system
US10948898B1 (en) 2013-01-18 2021-03-16 Bell Sports, Inc. System and method for custom forming a protective helmet for a customer's head
US10959478B2 (en) 2017-09-22 2021-03-30 Hummingbird Sports, Llc Eye protection orientation system
USD927084S1 (en) 2018-11-22 2021-08-03 Riddell, Inc. Pad member of an internal padding assembly of a protective sports helmet
US11154108B2 (en) 2015-02-25 2021-10-26 Joey LaRocque Vented soft-sided helmet
US11167198B2 (en) 2018-11-21 2021-11-09 Riddell, Inc. Football helmet with components additively manufactured to manage impact forces
US11166511B2 (en) 2012-09-10 2021-11-09 Riddell, Inc. Protective sports helmet chinstrap assembly
US11213736B2 (en) 2016-07-20 2022-01-04 Riddell, Inc. System and methods for designing and manufacturing a bespoke protective sports helmet
US11229256B1 (en) 2016-01-29 2022-01-25 Aes R&D, Llc Face mask shock-mounted to helmet shell
US11399589B2 (en) 2018-08-16 2022-08-02 Riddell, Inc. System and method for designing and manufacturing a protective helmet tailored to a selected group of helmet wearers
US11517062B2 (en) * 2018-05-15 2022-12-06 Brian Timlick Helmet with unique impact absorption and redirection features
US11589630B2 (en) * 2017-12-18 2023-02-28 Svein Kleiven Protective device

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Publication number Publication date
CA1018301A (en) 1977-10-04
DE2362325A1 (en) 1974-06-27
GB1420703A (en) 1976-01-14

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