US3116490A - Safety helmet having a semi-flexible liner - Google Patents

Safety helmet having a semi-flexible liner Download PDF

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Publication number
US3116490A
US3116490A US256734A US25673463A US3116490A US 3116490 A US3116490 A US 3116490A US 256734 A US256734 A US 256734A US 25673463 A US25673463 A US 25673463A US 3116490 A US3116490 A US 3116490A
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shell
layer
liner
flange
edge
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US256734A
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Zbikowski Ted
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JOSEPH BUEGELEISEN CO
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JOSEPH BUEGELEISEN CO
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    • 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
    • A42B3/06—Impact-absorbing shells, e.g. of crash helmets
    • A42B3/062—Impact-absorbing shells, e.g. of crash helmets with reinforcing means
    • A42B3/063—Impact-absorbing shells, e.g. of crash helmets with reinforcing means using layered structures
    • A42B3/064—Impact-absorbing shells, e.g. of crash helmets with reinforcing means using layered structures with relative movement between layers
    • 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
    • A42B3/14—Suspension devices
    • 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

  • This invention relates to a safety helmet and more particularly to a safety helmet shell having an interior free floating shock absorbing liner.
  • Safety helmets are commonly made of a rigid, outer, protective shell whose interior is covered with a padding of resilient material which functions as a load absorbing cushion.
  • the object of this invention is to improve such a helmet construction by providing an additional load absorbing element, namely a semi-flexible liner located within the shell and cushioning layer.
  • the liner is formed of semiflexible material, that is, of a material which will flex or bend only under substantial load.
  • the liner is arranged to freely float and flex a distance before contacting and applying pressure to the cushioning layer to thus substantially slow down and reduce impact forces against the wearers head.
  • FIG. 1 is a cross-sectional elevational View of the safety helmet herein.
  • FIG. 2 is an enlarged cross-sectional view of an edge portion thereof.
  • FIG. 3 is an enlarged cross-sectional view, similar to FIG. 2 but showing a modification.
  • the safety helmet 10 includes an inverted, bowlshaped, outer shell 11, formed of a hard, substantially rigid, plastic material, such as fibrous glass reinforced resin.
  • the inner wall surface of the shell is covered with a cushioning layer 12, except for a lower, exposed, edge strip portion 13.
  • the cushioning layer is preferably formed of a foamed plastic material, such as foamed polystyrene, which is characterized by being resilient and compressible under pressure but having a relatively slow recovery rate upon release of pressure to return to its original shape.
  • foamed plastic material such as foamed polystyrene
  • On-e suitable cushioning material is that described in U.S. Patent No. 3,058,162, used in a thickness of about A of an inch.
  • the cushioning layer 12 is secured to the shell by any suitable adhesive so that it is firmly and non-shiftably positioned in place.
  • An inner, bowl-shaped liner '14 is placed within the shell and cushioning layer.
  • This layer is relatively thin, and is formed of a semi-flexible, relatively stiff, ma terial which will flex or bend only under considerable pressure, and which will return to its initial shape upon release of the pressure.
  • One material suitable for this purpose is that identified as Royalite 20, manufactured by United States Rubber Company, a semi-flexible thermoplastic material, of about .030" Wall thickness.
  • the lower edge of the liner is bent outwardly with a relatively sharp bend to form an outwardly extending continuous flange 15 located beneath the lower edge of the cushioning layer 12 and of a width which is slightly greater than the thickness of the cushioning layer.
  • the free edge of the flange 1-5 is bent downwardly to form an edge band 16 arranged in face to face contact with the lower edge strip 13 of the outer shell.
  • a continuous, U-s'haped edge beading 17 formed of rubber or a rubber-like material receives the outer shell edge strip 13 and the band portion 16 of the inner liner and frictionally clamps them together, the inner liner being otherwise free of securement to the shell and its bowl-shaped portion being free of any positive securement to the cushioning layer and the shell and being spaced a slight distance 18 from the inner surface of the cushioning layer.
  • the helmet may be provided with a headband if desirable or may be used as is with the addition of a chin strap secured to the shell in the conventional manner.
  • the outer shell will distribute imp-act loads over a wide area and will prevent or minimize penetration to the head of the impact creating instrument, ([2) the wearers head will momentarily move relative to the shell, thus flexing or bending the inner liner locally over an area which is considerably larger than the area of impact, and also distorting the entire inner liner relative to the shell, until contact is made between the inner liner and the cushioning layer, (c) which layer will then resiliently compress.
  • the resistance of the inner liner to flexing and bending and the free floating momentary movement of the inner liner will absorb a considerable portion of the impact and, most importantly, will slow down the otherwise more rapid movement of the head towards the hard shell to considerably minimize the possibility of a brain concussion.
  • FIG. 3 illustrates a modification wherein the inner liner outwardly bent flange 15a is formed Without the depending band but instead abuts the shell along its free edge 19' in a continuous line around the interior of the shell wall.
  • the liner is held in place between the beading 17a and the lower edge of the cushioning layer 12 and is maintained there partially by firiction and partially by the rigidity of the inner liner.
  • a safety helmet comprising an inverted, thin wall, bowl-shaped outer shell formed of a substantially rigid material; the entire interior wall surface of the shell, except for a narrow, continuous strip at the lower, that is, open edge of the shell, being covered with a relatively thick layer of a resileint, cushioning material adhesively secured thereto; an inner liner, bowl-shaped similarly to the shell, fitted within the shell and the covering layer, with the lower edge of the liner being bent outwardly to form a continuous, outwardly extending peripheral edge flange, the flange being slightly wider than the thickness of said layer and having its outer edge frictionally engaged against the shell inner surface below the layer and adjacent the lower edge of the shell, and support means arranged on the lower edge of said shell and frictional ly engaging said flange for holding the flange in its position relative to the shell, the bowl-shaped portion of the liner being free of positive securement to the layer and to the shell and its outer wall surface normally being spaced a short distance inward-1y of the layer inner wall surface,
  • a construction as defined in claim 1, and said cushioning layer being formed of a resilient, foamed plastic material characterized by resiliently compressing under pressure and having a relatively slow recovery rate, upon release of pressure, to its initial shape,
  • said support means being in the form of a. resilient, continuous edge bead secured to the lower edge of the shell and extending inwardly of the shell, beneath said flange, and said flange being fricti'onal'ly clamped between the edge bead and the lower edge of said layer.

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  • Helmets And Other Head Coverings (AREA)

Description

Jan. 7, 1964 'r. ZBIKOWSKI SAFETY HELMET HAVING A SEMI-FLEXIBLE LINER Filed Feb. 6, 1965 INVENTOR.
TED ZBIKOWSKI ATTORNEYS United States Patent 3,116,490 SAFETY HELMET HAVING A SEMI-FLEXIBLE LINER Ted Zbikowski, Detroit, Mich., assignor to Joseph Buegeleisen 60., Southfield, Mich. Filed Feb. 6, 1963, Ser. No. 256,734 4 Claims. (Cl. 2-3) This invention relates to a safety helmet and more particularly to a safety helmet shell having an interior free floating shock absorbing liner.
Safety helmets are commonly made of a rigid, outer, protective shell whose interior is covered with a padding of resilient material which functions as a load absorbing cushion.
The object of this invention is to improve such a helmet construction by providing an additional load absorbing element, namely a semi-flexible liner located within the shell and cushioning layer. The liner is formed of semiflexible material, that is, of a material which will flex or bend only under substantial load. The liner is arranged to freely float and flex a distance before contacting and applying pressure to the cushioning layer to thus substantially slow down and reduce impact forces against the wearers head.
This and other objects and advantages of this invention will become apparent upon reading the following description, of which the attached drawings form a part.
In these drawings:
FIG. 1 is a cross-sectional elevational View of the safety helmet herein.
FIG. 2 is an enlarged cross-sectional view of an edge portion thereof.
FIG. 3 is an enlarged cross-sectional view, similar to FIG. 2 but showing a modification.
The safety helmet 10, includes an inverted, bowlshaped, outer shell 11, formed of a hard, substantially rigid, plastic material, such as fibrous glass reinforced resin.
The inner wall surface of the shell is covered with a cushioning layer 12, except for a lower, exposed, edge strip portion 13. The cushioning layer is preferably formed of a foamed plastic material, such as foamed polystyrene, which is characterized by being resilient and compressible under pressure but having a relatively slow recovery rate upon release of pressure to return to its original shape. On-e suitable cushioning material is that described in U.S. Patent No. 3,058,162, used in a thickness of about A of an inch.
The cushioning layer 12 is secured to the shell by any suitable adhesive so that it is firmly and non-shiftably positioned in place.
An inner, bowl-shaped liner '14 is placed within the shell and cushioning layer. This layer is relatively thin, and is formed of a semi-flexible, relatively stiff, ma terial which will flex or bend only under considerable pressure, and which will return to its initial shape upon release of the pressure. One material suitable for this purpose is that identified as Royalite 20, manufactured by United States Rubber Company, a semi-flexible thermoplastic material, of about .030" Wall thickness.
The lower edge of the liner is bent outwardly with a relatively sharp bend to form an outwardly extending continuous flange 15 located beneath the lower edge of the cushioning layer 12 and of a width which is slightly greater than the thickness of the cushioning layer. The free edge of the flange 1-5 is bent downwardly to form an edge band 16 arranged in face to face contact with the lower edge strip 13 of the outer shell.
A continuous, U-s'haped edge beading 17 formed of rubber or a rubber-like material receives the outer shell edge strip 13 and the band portion 16 of the inner liner and frictionally clamps them together, the inner liner being otherwise free of securement to the shell and its bowl-shaped portion being free of any positive securement to the cushioning layer and the shell and being spaced a slight distance 18 from the inner surface of the cushioning layer.
The helmet may be provided with a headband if desirable or may be used as is with the addition of a chin strap secured to the shell in the conventional manner.
In operation, whether with or without a headband, upon impact: (a) the outer shell will distribute imp-act loads over a wide area and will prevent or minimize penetration to the head of the impact creating instrument, ([2) the wearers head will momentarily move relative to the shell, thus flexing or bending the inner liner locally over an area which is considerably larger than the area of impact, and also distorting the entire inner liner relative to the shell, until contact is made between the inner liner and the cushioning layer, (c) which layer will then resiliently compress. Thus, the resistance of the inner liner to flexing and bending and the free floating momentary movement of the inner liner will absorb a considerable portion of the impact and, most importantly, will slow down the otherwise more rapid movement of the head towards the hard shell to considerably minimize the possibility of a brain concussion.
FIG. 3 illustrates a modification wherein the inner liner outwardly bent flange 15a is formed Without the depending band but instead abuts the shell along its free edge 19' in a continuous line around the interior of the shell wall. The liner is held in place between the beading 17a and the lower edge of the cushioning layer 12 and is maintained there partially by firiction and partially by the rigidity of the inner liner.
This invention may be further developed within the scope of the following claims. Accordingly, it is desired that the foregoing description be read as being merely illustrative of an operative embodiment of this invention and not in a strictly limited sense.
I now claim:
1. A safety helmet comprising an inverted, thin wall, bowl-shaped outer shell formed of a substantially rigid material; the entire interior wall surface of the shell, except for a narrow, continuous strip at the lower, that is, open edge of the shell, being covered with a relatively thick layer of a resileint, cushioning material adhesively secured thereto; an inner liner, bowl-shaped similarly to the shell, fitted within the shell and the covering layer, with the lower edge of the liner being bent outwardly to form a continuous, outwardly extending peripheral edge flange, the flange being slightly wider than the thickness of said layer and having its outer edge frictionally engaged against the shell inner surface below the layer and adjacent the lower edge of the shell, and support means arranged on the lower edge of said shell and frictional ly engaging said flange for holding the flange in its position relative to the shell, the bowl-shaped portion of the liner being free of positive securement to the layer and to the shell and its outer wall surface normally being spaced a short distance inward-1y of the layer inner wall surface, and the liner being formed of a stiff, semi-flexible material, characterized by being bendable under substantial pressure but normally recovering its shape upon release of such pressure, whereby the liner, when under pressure may freely float and flex within the shell for a short distance before pressing against the cushioning layer.
2. A construction as defined in claim 1, and wherein the free edge of said liner flange is bent downwardly to form a narrow edge band arranged in face to face contact with the lower, narrow edge strip of the shell, and said support means being in the form of a U-shaped edge beading extending around the shell lower edge and receiving the shell lower edge and said edge band and frictionally clamping the edge band to the shell lower edge.
3. A construction as defined in claim 1, and said cushioning layer being formed of a resilient, foamed plastic material characterized by resiliently compressing under pressure and having a relatively slow recovery rate, upon release of pressure, to its initial shape,
4, A construction as defined in claim 1, and said support means being in the form of a. resilient, continuous edge bead secured to the lower edge of the shell and extending inwardly of the shell, beneath said flange, and said flange being fricti'onal'ly clamped between the edge bead and the lower edge of said layer.
References Cited in the file of this patent UNITED STATES PATENTS McMurry Sept. 1, 1959 Roth et a1. Feb. 9, 1960 Zbikowski July 11, 196 1 Zbikowski Jan. 2, 1962 Cairns Apr. 30, 1963

Claims (1)

1. A SAFETY HELMET COMPRISING AN INVERTED, THIN WALL, BOWL-SHAPED OUTER SHELL FORMED OF A SUBSTANTIALLY RIGID MATERIAL; THE ENTIRE INTERIOR WALL SURFACE OF THE SHELL. EXCEPT FOR A NARROW, CONTINUOUS STRIP AT THE LOWER, THAT IS, OPEN EDGE OF THE SHELL, BEING COVERED WITH A RELATIVELY THICK LAYER OF A RESILEINT, CUSHIONING MATERIAL ADHESIVELY SECURED THERETO; AN INNER LINER, BOWL-SHAPED SIMILARLY TO THE SHELL, FITTED WITHIN THE SHELL AND THE COVERING LAYER, WITH THE LOWER EDGE OF THE LINER BEING BENT OUTWARDLY TO FORM A CONTINUOU8S, OUTWARDLY EXTENDING PERIPHERAL EDGE FLANGE, THE FLANGE BEING SLIGHTLY WIDER THAN THE THICKNESS OF SAID LAYER AND HAVING ITS OUTER EDGE FRICTIONALLY ENGAGED AGAINST THE SHELL INNER SURFACE BELOW THE LAYER AND ADJACENT OF THE LOWER EDGE OF THE SHELL AND FRICTIONALLY ENGAGING SAID FLANGE FOR HOLDING THE FLANGE IN ITS POSITION RELATIVE TO THE SHELL, THE BOWL-SHAPED PORTION OF THE LINER BEING FREE OF POSITIVE SECUREMENT TO THE LAYER AND TO THE SHELL AND ITS OUTER WALL SURFACE NORMALLY BEING SPACED A SHORT DISTANCE INWARDLY OF THE LAYER INNER WALL SURFACE, AND THE LINER BEING FORMED OF A STIFF, SEMI-FLEXIBLE MATERIAL, CHARACTERIZED BY BEING BENDABLE UNDER SUBSTANTIAL PRESSURE BUT NORMALLY RECOVERING ITS SHAPE UPON RELEASE PF SUCH PRESSURE, WHEREBY THE LINER, WHEN UNDER PRESSURE MAY FREELY FLOAT AND FLEX WITHIN THE SHELL FOR A SHORT DISTANCE BEFORE PRESSING AGAINST THE CUSHIONING LAYER.
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Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213463A (en) * 1964-02-19 1965-10-26 Joseph Buegeleisen Co Safety helmet and headband therefor
US3286275A (en) * 1964-12-30 1966-11-22 American Safety Equip Safety helmet
US3314078A (en) * 1965-10-12 1967-04-18 American Safety Equip Safety helmet chin strap
US3467964A (en) * 1968-07-22 1969-09-23 James M Hannan Safety helmet edge bead
US3500475A (en) * 1967-03-01 1970-03-17 Honda Gijutsu Kenkyusho Kk Protective helmet
US3946441A (en) * 1973-03-19 1976-03-30 Johnson John R Safety helmet
US4006496A (en) * 1975-08-13 1977-02-08 Land Tool Company Safety helmet
US4044399A (en) * 1975-04-23 1977-08-30 Morton William G Safety helmet with individualized head-contoured inter-liner
US4081865A (en) * 1977-07-08 1978-04-04 Bergee Mark A Protective helmet and ventilating system therefor
US4101983A (en) * 1976-06-04 1978-07-25 Regie Nationale Des Usines Renault Enveloping helmet of composite structure
FR2473855A1 (en) * 1980-01-18 1981-07-24 Gallet Adrien Safety helmet for motorcyclist - has outer rigid cap and inner cap moulded with gutter to hold intermediate padding
USD266626S (en) 1980-09-11 1982-10-26 The Regents Of The University Of Michigan Police helmet
US4538303A (en) * 1982-09-16 1985-09-03 Romer Gmbh Protective helmet
AT378779B (en) * 1983-01-31 1985-09-25 Oregon Ets Patentverwertung MULTI-LAYER, SHOOT AND / OR SPLITTERHEMMER, IN itself stiff protective element
US5204998A (en) * 1992-05-20 1993-04-27 Liu Huei Yu Safety helmet with bellows cushioning device
US5231703A (en) * 1991-05-31 1993-08-03 Louis Garneau Protective headgear
US5351342A (en) * 1992-02-03 1994-10-04 Louis Garneau Protective headgear
DE29608345U1 (en) * 1996-05-08 1997-02-06 Krauter, Manfred, 01900 Bretnig-Hauswalde Helmet, especially for occupational, fire and disaster protection
EP1749453A1 (en) * 2005-08-03 2007-02-07 Anton Pfanner Protective helmet
US20090064386A1 (en) * 2007-09-06 2009-03-12 David Charles Rogers Helmet edge band
US20120011639A1 (en) * 2010-07-13 2012-01-19 Sport Maska Inc. Helmet with rigid shell and adjustable liner
USD704895S1 (en) * 2013-08-05 2014-05-13 William J. Jennings Shock absorbing head cap
USD704894S1 (en) * 2013-08-05 2014-05-13 William J. Jennings Shock absorbing head cap
ITPD20130359A1 (en) * 2013-12-23 2015-06-24 Massimo Simonaggio HELMET STRUCTURE
WO2015004537A3 (en) * 2013-06-28 2015-08-20 Revision Military S.A.R.L. Helmets including spray on materials
US20150237946A1 (en) * 2012-10-05 2015-08-27 Elwood J. B. Simpson Football helmet having improved impact absorption
USD739087S1 (en) * 2014-04-30 2015-09-15 William J. Jennings Shock absorbing head cap
US20160249702A1 (en) * 2013-10-11 2016-09-01 Pfanner Schutzbekleidung Gmbh Protective helmet
US20160256763A1 (en) * 2015-03-06 2016-09-08 Michael Henry McGee Compositions for preventing head injuries in team sports
US9498014B2 (en) 2010-07-22 2016-11-22 Kranos Ip Corporation Protective helmet
US9572390B1 (en) * 2012-10-05 2017-02-21 Elwood J. B. Simpson Football helmet having improved impact absorption
US10258100B1 (en) 2012-06-18 2019-04-16 Kranos Ip Corporation Football helmet with raised plateau
US10506841B2 (en) 2013-02-12 2019-12-17 Riddell, Inc. Football helmet with recessed face guard mounting areas
US10542788B2 (en) 2017-05-11 2020-01-28 Safer Sports, LLC Football helmet having three energy absorbing layers
US10813403B2 (en) 2018-11-01 2020-10-27 Kranos Ip Corporation Football helmet having exceptional impact performance
US10932514B2 (en) 2002-05-01 2021-03-02 Riddell, Inc. Protective sports helmet
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
US20210153591A1 (en) * 2017-10-19 2021-05-27 Trek Bicycle Corporation Cycling helmet
USD927073S1 (en) 2019-04-16 2021-08-03 Safer Sports, LLC Football helmet
USD927084S1 (en) 2018-11-22 2021-08-03 Riddell, Inc. Pad member of an internal padding assembly of a protective sports helmet
USD935106S1 (en) 2019-11-22 2021-11-02 Safer Sports, LLC Helmet
US11167198B2 (en) 2018-11-21 2021-11-09 Riddell, Inc. Football helmet with components additively manufactured to manage impact forces
US11213736B2 (en) 2016-07-20 2022-01-04 Riddell, Inc. System and methods for designing and manufacturing a bespoke protective sports helmet
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
WO2022248616A1 (en) * 2021-05-26 2022-12-01 Mips Ab Helmet
US20240164466A1 (en) * 2021-03-24 2024-05-23 Mips Ab Headgear and device for headgear
US12256797B2 (en) 2019-11-22 2025-03-25 Safer Sports, LLC Soft shell helmet
US20250123082A1 (en) * 2023-10-16 2025-04-17 Point Blank Enterprises, Inc. Modular tactical helmet
US12439989B2 (en) 2022-07-12 2025-10-14 ABUS August Bremicker Söhne KG Liner
EP4531619A4 (en) * 2022-05-25 2026-05-06 Gentex Corp SHOCK ABSORBING DRAWBACK HELMET CLOTHING

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US2901750A (en) * 1957-07-10 1959-09-01 Frederick F Welsh Crash helmet
US2923941A (en) * 1960-02-09 Protective helmet
US2991478A (en) * 1959-10-14 1961-07-11 Joseph Buegeleisen Company Safety helmet
US3015103A (en) * 1959-05-21 1962-01-02 Joseph Buegeleisen Company Safety helmet
US3087165A (en) * 1960-04-15 1963-04-30 Cairns & Brother Inc Headgear

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US2923941A (en) * 1960-02-09 Protective helmet
US2901750A (en) * 1957-07-10 1959-09-01 Frederick F Welsh Crash helmet
US3015103A (en) * 1959-05-21 1962-01-02 Joseph Buegeleisen Company Safety helmet
US2991478A (en) * 1959-10-14 1961-07-11 Joseph Buegeleisen Company Safety helmet
US3087165A (en) * 1960-04-15 1963-04-30 Cairns & Brother Inc Headgear

Cited By (83)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213463A (en) * 1964-02-19 1965-10-26 Joseph Buegeleisen Co Safety helmet and headband therefor
US3286275A (en) * 1964-12-30 1966-11-22 American Safety Equip Safety helmet
US3314078A (en) * 1965-10-12 1967-04-18 American Safety Equip Safety helmet chin strap
US3500475A (en) * 1967-03-01 1970-03-17 Honda Gijutsu Kenkyusho Kk Protective helmet
US3467964A (en) * 1968-07-22 1969-09-23 James M Hannan Safety helmet edge bead
US3946441A (en) * 1973-03-19 1976-03-30 Johnson John R Safety helmet
US4044399A (en) * 1975-04-23 1977-08-30 Morton William G Safety helmet with individualized head-contoured inter-liner
US4006496A (en) * 1975-08-13 1977-02-08 Land Tool Company Safety helmet
US4101983A (en) * 1976-06-04 1978-07-25 Regie Nationale Des Usines Renault Enveloping helmet of composite structure
US4081865A (en) * 1977-07-08 1978-04-04 Bergee Mark A Protective helmet and ventilating system therefor
FR2473855A1 (en) * 1980-01-18 1981-07-24 Gallet Adrien Safety helmet for motorcyclist - has outer rigid cap and inner cap moulded with gutter to hold intermediate padding
USD266626S (en) 1980-09-11 1982-10-26 The Regents Of The University Of Michigan Police helmet
US4538303A (en) * 1982-09-16 1985-09-03 Romer Gmbh Protective helmet
AT378779B (en) * 1983-01-31 1985-09-25 Oregon Ets Patentverwertung MULTI-LAYER, SHOOT AND / OR SPLITTERHEMMER, IN itself stiff protective element
US5231703A (en) * 1991-05-31 1993-08-03 Louis Garneau Protective headgear
US5351342A (en) * 1992-02-03 1994-10-04 Louis Garneau Protective headgear
US5204998A (en) * 1992-05-20 1993-04-27 Liu Huei Yu Safety helmet with bellows cushioning device
DE29608345U1 (en) * 1996-05-08 1997-02-06 Krauter, Manfred, 01900 Bretnig-Hauswalde Helmet, especially for occupational, fire and disaster protection
US10932514B2 (en) 2002-05-01 2021-03-02 Riddell, Inc. Protective sports helmet
EP1749453A1 (en) * 2005-08-03 2007-02-07 Anton Pfanner Protective helmet
US20090064386A1 (en) * 2007-09-06 2009-03-12 David Charles Rogers Helmet edge band
US8661572B2 (en) 2007-09-06 2014-03-04 Artisent, Llc Helmet edge band
US9572387B2 (en) 2007-09-06 2017-02-21 Artisent, Llc Helmet edge band
US20120011639A1 (en) * 2010-07-13 2012-01-19 Sport Maska Inc. Helmet with rigid shell and adjustable liner
US9226539B2 (en) * 2010-07-13 2016-01-05 Sport Maska Inc. Helmet with rigid shell and adjustable liner
US10357075B2 (en) * 2010-07-22 2019-07-23 Kranos Ip Corporation Impact attenuation system for a protective helmet
US20190075881A1 (en) * 2010-07-22 2019-03-14 Kranos Ip Corporation Impact attenuation system for a protective helmet
US10470515B2 (en) * 2010-07-22 2019-11-12 Kranos Ip Corporation Football helmet with pressable front section
US10285466B2 (en) * 2010-07-22 2019-05-14 Kranos Ip Corporation Football helmet with shell section defined by a non-linear channel
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