US20140020158A1 - Multilayer impact attenuating insert for headgear - Google Patents

Abstract

Impact attenuating liner for headgear and headgear employing the liner, the liner positionable inside the headgear and comprising a cellular layer having an array of individual impact attenuating cells, each individual impact attenuating cells including an impact attenuating medium. The impact attenuating cells can comprise a gas, liquid, visco-elastic gel, foam, fiber or combinations thereof as well other impact attenuating medium. In another aspect, the impact attenuating liner has at least two layers, a cellular layer of and an impact attenuating layer under the cellular. The liner can include a cover. The liner can be removable from the headgear.

Description

CROSS REFERENCE TO RELATED APPLICATIONS
• This application claims priority to U.S. provisional application Ser. No. 61/480,847, filed Apr. 29, 2011 and to U.S. provisional patent application Ser. No. 61/521,584 filed Aug. 9, 2011, both of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
• The invention relates generally to headgear and more specifically to impact attenuating headgear intended to reduce the incidence or severity of closed head injuries.
• Closed head injuries, particularly concussions, are a relatively common occurrence. The term concussion describes an injury to the brain resulting from an impact to the head. By definition, a concussion is not a life-threatening injury, but it can cause both short-term and long-term problems. The terms mild brain injury, mild traumatic brain injury (MTBI), mild head injury (MHO, minor head trauma, and concussion may be used interchangeably. Frequently defined as a head injury with a temporary loss of brain function, concussion can cause a variety of physical, cognitive, and emotional symptoms A mild concussion may involve feeling “dazed” or a very brief loss of consciousness, for example, being “knocked out”. A severe concussion may involve prolonged loss of consciousness with a delayed return to normal.
• A concussion can be caused by a blow to the head, or by acceleration forces without a direct impact. The forces involved disrupt cellular processes in the brain for days or weeks. Concussions often occur in sports, particularly contact sports such as football or hockey. Military personnel can suffer concussions from direct blows to the head or from the percussion of an explosive device.
• Treatment of concussion involves monitoring and rest. Symptoms usually go away entirely within three weeks, though they may persist, or complications may occur. Repeated concussions can cause cumulative brain damage or severe complications such as second-impact syndrome.
• Use of protective equipment such as headgear has been found to reduce the number of concussions in athletes and military personnel. Improvements in the design of protective gear such as helmets may decrease the number and severity of such injuries.
• It would be advantageous, therefore, to have protective headgear with enhanced impact attenuating properties.
SUMMARY OF THE INVENTION
• Headgear with enhanced impact attenuating properties is provided. The headgear can be provided as a liner for protective headgear, such as a helmet, or as an integral part of the protective headgear.
• The headgear comprises an impact attenuating or shock reducing pad which can be employed as a permanent liner or replaceable liner for protective headgear such as a helmet. In one aspect, the pad comprises a flexible base or web having an array of individual cells across the web. The liner is configured to fit within the cavity of an impact resistant shell, such as a helmet. As such the liner is configured so as to be folded and positioned within the helmet. The liner can be reasonably secured inside the helmet shell or integral with the helmet shell.
• The individual cells can be air cells. The air cells can be sealed at an optimal internal pressure or can be interconnected by airflow channels so that pressure can be equalized among the cells. The size of the various air flow channels is predetermined can be varied to control the flow of air between the cells at impact to better control the impact attenuating characteristics of the pad.
• In another embodiment, the cells can be at least partially filled with another impact attenuating medium such as a visco-elastic material or foam or impact attenuating plastic that has optimal impact attenuating characteristics.
• In another aspect, the impact attenuating liner comprises an impact attenuating base and an impact attenuating cellular layer positioned on the base.
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a perspective view of an impact attenuating liner inside headgear;
• FIG. 2 is a perspective view of an impact attenuating headgear liner;
• FIG. 3 is a top plan view of the impact attenuating liner;
• FIG. 4 is a side elevational view thereof;
• FIG. 5 is a front plan view thereof;
• FIG. 6 is a rear plan view thereof;
• FIG. 7 is a top plan view of another aspect of an impact attenuating headgear liner;
• FIG. 8 is a perspective view of another aspect of an impact attenuating headgear liner;
• FIG. 9 is a top plan view thereof;
• FIG. 10 is a perspective view of another aspect of an impact attenuating headgear liner;
• FIG. 11 is a perspective view of a multilayer impact attenuating headgear liner;
• FIG. 12 is a top plan view of the multilayer impact attenuating liner ofFIG. 11 inside headgear; and
• FIG. 13 is a perspective view of one embodiment of a manual inflation pump.
DETAILED DESCRIPTION
• One embodiment of the impact attenuating headgear is indicated generally byreference numeral10. The illustrated headgear comprises anouter shell12 defining aninner cavity14. There is an impact attenuating pad or liner withincavity14.Cavity14 is sized and configured such that a wearer's head is snugly and comfortably nestled within the cavity and surrounded by the liner, as will be explained.
• It will be noted thatouter shell12, as illustrated, is commonly referred to as a helmet. The illustrated embodiment is configured as a military type helmet. The outer shell, however, can be any type of helmet including, but not limited to, a football helmet, racing or motorcycle helmet, bicycling helmet, baseball batter's helmet, hockey, skiing, or the like. It will be understood that any reference to an outer shell or helmet or headgear herein is intended to encompass any type of protective headgear presently known or developed in the future.
• In general,outer shell12 is impact resistant, in that it comprises a hard material that resists penetration or breaking, cracking or shattering upon impact. Although no material is absolutely impact resistant, the material comprising the outer shell will be referred to as impact resistant in the general sense. Such materials include, but are not limited to, synthetic fiber materials such as Kevlar® high impact plastics, fiberglass or metal.
• Impact attenuating pad orliner16 comprises abase18, which is constructed as a flexible web. There is anarray20 of individual,upstanding cells21 across the web. The liner can be constructed withcells21 molded into an upper or top sheet, or conformal, which is then adhered to a bottom or backing sheet. The bottom sheet and the material around the cells form a flexible web. However, the impact attenuating pad can be formed or molded or constructed in any acceptable manner.
• Cells21 are referred to as impact attenuating cells in that they absorb forces exerted against the cells resulting from impact to the outer shell or jarring or shaking movement of the wearer's head. In one embodiment,cells21 are upstanding inflatable cells. Many of the cells are substantially rectangular, while others are triangular and others trapezoidal in peripheral configuration. The configuration of the cells allows the liner to be folded into place within the helmet without any gaps between impact attenuating cells. In any event, the upstanding cells include atop wall22 andside walls23 around the periphery of the cell. The cells can be filled with a gas, such as air, to a desired pressure and sealed.
• In other aspects, the cells can be partially or fully filled with another impact attenuating material, such as liquid or foam or visco-elastic material or combinations thereof. In one aspect of the liner the cells are about ¾ inch high when fully functional.
• In the illustrated embodiment,cells21 can be interconnected by air flow pathways orconduits24 extending throughbase18. The interconnected cells can have enhanced impact attenuating properties since the pressure within the cells can be equalized. Moreover, if there is impact at one area of the cells, air within those cells will be forced through the air conduits to better absorb the force. The cross-sectional area ofconduits24 may be varied among the cells to enhance or control the shock or force absorbing characteristics of the cells by controlling the egress of air out of the cells upon the application of force. As seen inFIG. 1,liner16 includes aninflation valve25 that is in fluid communication with the cells. The wearer can optimally inflate the base for a snug fit, either by inflating the cells and donning the helmet or by donning the helmet then inflating the cells until the desired fit is achieved.
• In one embodiment, the base and cells comprise a dip molded neoprene material which has optimal pressure dispersing characteristics. The base and cells also can be a cavity molded polyurethane or other appropriate material.
• In alternative embodiments, the base and cells can be molded from urethane or similar materials.Cells21 can contain or be filled with, or fashioned from, other impact attenuating material, such as visco-elastic gel, or foam or the like. Moreover, some of the cells can be air cells and others can be gel or foam filled cells. In other embodiments, the cells are not filled with gel or foam, but the cell itself is constructed of gel or foam.
• The liner has major components that are intended to provide impact attenuation at primary areas of a wearer's skull when folded and positioned within the cavity of the protective shell.Liner16 includes acentral section26 that is positioned at the midline of the protective shell and extends the length of the liner and extends from the frontal area, over the parietal area and to the occipital area of the skull of the wearer. There is aforward section28, havingside flaps28A and28B at the first or front end of the central section that is positioned across the frontal area of the skull. At the approximate midpoint of the central section there is a firsttemporal pad30 and an opposed secondtemporal pad32. At the rear or second end of the central section isrear section34, havingside flaps34A and34B that is position over the occipital area of the wearer's skull.
• As seen fromFIG. 1,liner16 is configured such that it can be folded and optimally positioned withincavity14. Hencebase18 includes a plurality of appropriately locatedfold lines34 between the major sections described above. Theair conduits24 extend throughfold lines25 without collapsing when folded.
• Another aspect of a liner, indicated generally byreference number40, is shown inFIG. 7.Liner40 includes a base42 with an array of individual upstanding,impact attenuating cells44 on the base. The cells are upstanding and include aperipheral side wall45 and atop wall46. In one aspect, the cells are about ¾ inch high when functional.Liner40 has a substantially cruciform peripheral configuration and comprises acenter section47, aforward section48, arear section49, afirst side section50 and asecond side section52. The side sections may be referred to as wings or temporal pads.
• Cells44 in the center, front and rear sections are substantially rectangular in peripheral configuration. The cells comprising first andsecond side sections50 and52, respectively, have varied configurations. As shown, the cells in the temporal pads are configured to define cut-outs orarches54 and56 positioned such that the liner does not impinge on the wearer's ears and hearing when position in a helmet.
• As previously described,cells44 ofliner40 may be partially or totally filled with a gas, such as air, or filled or partially filled with another impact attenuating material such as a liquid, foam, a visco-elastic material, an impact attenuating plastic or the like. In any event,cells44, containing a gas or another flowable medium, such as liquid, are interconnected byfluid flow conduits58 to equalize the pressure among the cells in use. The conduits may be varied in size to control fluid flow patterns, as described above.
• Liner44 may be sealed or include anair valve59, which can be a self-inflating valve or even a valve and pump combination. The valve59 (or pump/valve, or a self-adjusting valve as disclosed in the assignee's co-pending provisional application Ser. No. 61/408,774, which is incorporated herein by reference) is located on one of the side sections so that it is easily reached when installed in a helmet and placed on the head. Also, by placingvalve50 at this position, it does not contact the head if the helmet is struck by a projectile or jarred by concussive force. In use, the helmet and liner is place on the head and inflated. The user then manipulatesvalve59 to allow some deflation until the helmet is optimally positioned on the head.
• FIGS. 8 and 9 illustrate another aspect of a liner, indicated generally asreference number60,Liner60 also has a substantially cruciform configuration and includes acenter section62, aforward section64, arear section66, afirst side section68 and asecond side section70.Liner60 comprises a base71 with an array of individual upstanding,impact attenuating cells72 on the base. Thecells70 have a substantially circular peripheral configuration and a rounded or domed cross-section.Cells70 are about ¾ inch high at the top when fully functional. The cells are interconnected byfluid flow conduits74, as previously described, and may be totally fluid filled or partially fluid filled or totally filled with another impact attenuating material or combinations thereof, as described above. One of the cells may incorporate a valve, a self-adjusting valve or pump, as at76, or as shown inFIG. 13. The air pad layer could also be pre-sealed during manufacture with a set amount of air so that it is not adjusted by the user.
• FIG. 10 illustrates another aspect of a liner, indicated generally byreference number80.Liner80 has a substantially cruciform peripheral configuration and includes an array of individual, upstanding dome-shapedcells82. The cells are interconnected by aweb84 that includes internal fluid flow conduits.Web84 defines a plurality ofopen areas86 spaced between the cells. These open areas reduce the material weight ofliner80 and promote ventilation. The cell and web structure is arranged with acenter section87, aforward section89, arear section90, a firsttemporal pad92 and a secondtemporal pad94.
• It should be noted thatopen spaces86 may be filled with other, light weight material, such as light weight foam. Or, as will be explained hereinafter,liner80 may be positioned on a pad. Appropriately configured surfaces of the pad may protrude intoopen areas86 between the cells.
• The dome shaped cells ofliners60 and80 offer significant advantages. As mentioned above, the liner is secured in the helmet, deflated, placed on the head and then inflated for proper fit. In some circumstances, cells with a top wall and peripheral side wall will collapse when deflated. However, the side walls buckle or fold and the folded or wrinkled cell material support the helmet on the head. It is difficult to get a proper fit or feel. On the other hand, when domed cells are deflated, the collapse inwardly without the wrinkling or folding, allowing for a better feel and a better fit upon inflation.
• FIGS. 11 and 12 illustrate another aspect of the impact attenuating liner. As seen, the liner is a multi-layer liner, indicated generally byreference number100, comprising a cellular layer, in this illustration the inflatablelayer being liner60 shown inFIG. 8 with its constituent parts. It will be understood that any of the previously described cellular liners may be employed in the multilayer liner. Themultilayer liner100 also includes abase layer102.Base layer102 is an impact attenuating layer comprising an impact attenuating material such as an appropriate liquid, foam, visco-elastic material, impact attenuating plastic such as Isoblox® (theDODDgroup, Allen, Tex.), fiber, either synthetic or natural, or any other material that has appropriate impact attenuating characteristics at the appropriate and useful dimensions.
• Moreover,base layer102 can comprise another cellular layer with different impact attenuating characteristics thancellular liner80. In any event,base layer102 has the same peripheral configuration ascellular liner60 and includes acenter104, afront section106, arear section108, a firsttemporal section110 and a secondtemporal section112. In one aspect,cellular layer60 is slightly undersized in width and length compared tobase layer102 so that when both layers are folded or configured to fit inside ahelmet12 the layers have coextensive peripheral edges, as shown inFIG. 12.
• In one aspect, themulti-layer liner100 is approximately ⅞ inch in thickness from the bottom surface of the base to the top of the functional cells.
• Base layer102 can have a cover and/or both layers together can be covered. In one example, the cover could have two pockets, one to hold the base layer and another to hold the cellular layer.
• In another aspect,cellular layer60 may be attached or bonded tobase layer102, for example by spot welds or hook and loop fastener (Velcro®) or any other means to keep the layers in alignment in use.
• Althoughbase layer102 is shown as a contiguous sheet, it can comprise discrete segments of impact attenuating material that are hinged or otherwise flexibly attached together to allow it to bend or flex to fit properly within the helmet. Or,base layer102 may comprise a cover or container that encloses a plurality of chunks or granules or pieces of impact attenuating material.
• One embodiment of an acceptable pump assembly is shown inFIG. 13 and indicated by reference number120. Pump assembly120 includes web122 with a diaphragm pump or other acceptable pump (not seen) inside a cell124. Cell124 is configured to be integrated into web122 in place of one of the cells described above or just ancillary to the cells. Pump assembly120 includes a release valve126 and appropriate fluid flow connection128 to an adjacent air cell to allow inflation of the air cells by manipulation of the pump. The user can don the helmet, actuate the pump until snug and release air, if necessary, through release valve126. Pump assembly may include other apparatus such as a check valve and manual inflation valve to allow inflation by an outside air source. Other aspects of acceptable pumps are shown in U.S. Pat. No. 5,074,765.
• The foregoing description of the various embodiments is intended to be illustrative of the broader aspects of the present invention and should not be construed in a limiting sense.

Claims (21)

1.-20. (canceled)

21. An impact attenuating liner for headgear comprising:

an impact attenuating cellular layer having a central section, a front section and a rear section, said cellular layer comprising a base with an array of individual impact attenuating cells on the base, each individual impact attenuating cell comprising at least one impact attenuating medium, said cellular layer configured to fold and fit within the headgear.

22. The liner ofclaim 21 wherein the impact attenuating medium is a gas within the cells.

23. The liner ofclaim 22 wherein the cellular layer comprises an integrated pump.

24. The liner ofclaim 22 wherein the cellular layer base further comprises a plurality of air flow paths of a predetermined volume interconnecting the cells.

25. The liner ofclaim 24 wherein the predetermined volume of at least a portion of the plurality of air flow paths is greater than the predetermine volume of at least another portion of the plurality of air flow paths.

26. The liner ofclaim 21 wherein the central section of the cellular layer comprises a first temporal section on a first side and a second temporal section on a second side.

27. The liner ofclaim 21 wherein the impact attenuating medium is a visco-elastic gel.

28. The liner ofclaim 21 wherein the impact attenuating medium is polyurethane foam.

29. The liner ofclaim 22 wherein the cells comprise a second impact attenuating medium selected from a group of impact attenuating media consisting of liquid, foam, visco-elastic material, plastic, synthetic fiber, natural fiber, and combinations thereof.

30. The liner ofclaim 26 wherein the central section is positioned at a midline of the headgear, the frontal section is positioned to correspond to a frontal area of a wearer's skull, the first temporal area and the second temporal area each correspond to the temporal areas of a wearer's skull, and the rear section positioned to correspond to an occipital area of a wearer's skull.

31. The liner ofclaim 21 wherein the liner comprises a second impact attenuating layer positioned adjacent the base of the cellular layer.

32. The liner ofclaim 31 wherein the second impact attenuating layer comprises an impact attenuating medium selected from the group consisting of liquid, foam, visco-elastic material, plastic, synthetic fiber, natural fiber, and combinations thereof.

33. An impact attenuating liner for headgear comprising:

an impact attenuating cellular pad positionable within the headgear, said cellular pad comprising a base with an array of individual impact attenuating cells on the base, each individual impact attenuating cell comprising an impact attenuating medium; and

a second impact attenuating layer adjacent the base of the cellular pad.

34. The liner ofclaim 33 further comprising a cover.

35. The liner ofclaim 33 wherein the cellular pad comprises a pump.

36. The liner ofclaim 33 wherein the second impact attenuating layer is complementary in peripheral configuration to the cellular pad and the layer and the cellular pad are configured to be foldable and positionable within the headgear.

37. The liner ofclaim 33 wherein the impact attenuating layer comprises an impact attenuating medium selected from the group consisting of liquid, foam, visco-elastic material, plastic, synthetic fiber, natural fiber, and combinations thereof.

38. The liner ofclaim 33 wherein the cellular pad is affixed to the impact attenuating layer.

39. Impact attenuating headgear comprising:

an outer shell defining an inner cavity;

an impact attenuating liner within the inner cavity, said liner comprising an impact attenuating base layer and a cellular layer on the base layer, the cellular layer comprising an array of individual impact attenuating cells, each individual impact attenuating cell comprising an impact attenuating medium selected from the group of impact attenuating media consisting of air, liquid, foam, visco-elastic gel, plastic, fiber and combinations thereof.

40. The headgear ofclaim 39 wherein the outer shell is a military helmet.

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