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Protective helmetRelated Patent Categories: Apparel, Guard Or Protector, For Wearer's Head, Firemen's HelmetsProtective helmet description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070056071, Protective helmet. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to protective helmets, and in particular to firefighters' helmets. [0002] Existing firefighters' helmets comprise a protective outer shell made from impact-resistant plastics or the like which is intended to protect the wearer from falling debris which often is a hazard of burning buildings. To protect the wearer also from the heat and sparks emitted from a fire, the helmet includes a visor and neck protector to protect the head, face and neck of the wearer. [0003] There are cases where the full protective effect of a firefighting helmet is not required. For example, firefighters may have to provide a rescue service at other emergencies in which there is no fire. Then a large firefighting helmet may be inconvenient, but head protection is still necessary. In particular, in the case of road traffic accidents, when a firefighter may need to work in a confined space eg. Within a damaged vehicle, the large helmet may be an impediment. In these cases, it is often found that firefighters will simply remove their helmets, exposing themselves to unnecessary danger. The preferred embodiments of this invention seek to provide a solution to this problem. [0004] Although some two-layer helmets have been proposed to solve this problem it is awkward to both fit the inner and outer helmets on the wearers head securely and provide a wearer friendly mechanism for disengaging the outer helmet. [0005] According to this invention there is provided a firefighters helmet comprising an inner protective shell configured to be worn on its own as a helmet, and an outer protective shell configured to be fitted over the inner shell and releasably retained thereon, comprising a retaining mechanism for retaining the inner shell in the outer shell, wherein the retaining mechanism is moveable by a user whilst wearing the inner shell between a first position in which the retaining mechanism engages a said shell substantially to prevent relative movement between the two shells and a second position in which the retaining mechanism permits relative movement of the shells whereby allowing the donning or doffing of the outer shell by the users. [0006] Preferably the outer shell has an outwardly extending brim or cape. [0007] The helmet may comprise a spacer for spacing the outer shell from the inner shell. The helmet may comprise a visor which is accommodated between the inner and outer shells when not in use. [0008] The retaining mechanism may be releasably biased towards the first position. Preferably the retaining mechanism is moveable by a user whilst wearing the inner shell in order to move it from the first to the second position for allowing the introduction or removal of the outer shell onto or off the inner shell. The retaining mechanism may be pivotally connected to the helmet. The retaining mechanism may be pivotally mounted to an attachment mechanism which is connected to the outer shell, the retaining mechanism thereby being spaced from the outer shell. [0009] The inner helmet may comprise a slot which is engageable by the attachment mechanism such that when the retaining mechanism is in the second position the attachment mechanism can be moved through the slot whilst when the retaining mechanism is in the first position the attachment mechanism cannot be moved through the slot. The retaining mechanism may engage a lower edge of the slot whilst in the first position. [0010] The attachment mechanism may comprise a mounting for an accessory to the helmet. [0011] The retaining mechanism may be disposed on the outer shell, in which case it may engage a lower edge of the inner shell. [0012] A helmet as described above may comprise a mounting for attaching at least one accessory to the helmet. [0013] Embodiments of the invention are now described purely by way of example and with reference to the following figures: [0014] FIG. 1A shows the outer helmet; [0015] FIG. 1B shows the inner helmet; [0016] FIGS. 2A and 2B show front and side views of the helmet shells assembled together; [0017] FIG. 3 shows an inside view of the inner shell locked into the outer helmet shell; [0018] FIGS. 4 to 7 show outer helmet shells with provision for various detachable accessories and ancillary equipment; [0019] FIG. 8 shows schematically an exploded view of a second embodiment of an outer helmet and an inner helmet, having a different attachment mechanism from that of FIGS. 1 to 3; [0020] FIG. 9 shows schematically a side perspective view of the attachment mechanism for securing the helmets shown in FIG. 8; [0021] FIG. 10 shows schematically a front view of the attachment mechanism of FIG. 9; [0022] FIG. 11 shows schematically the helmets being attached together; [0023] FIG. 12 shows schematically the attachment Mechanism in a locked position; and [0024] FIG. 13 shows schematically the attachment mechanism in an unlocked position. 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