# US 2014/0196198 A1 · Protective Helmets > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0196198 A1 - Document ID: US20140196198A1 - Status: Published application - Kind: A1 - Application number: 14/171,283 - Filed: 2014-02-03 - Published: 2014-07-17 - Earliest claimed: 2012-09-14 - Assignees: Pidyon Controls Inc. - Inventors: Yochanan Cohen - Web page: https://patentgrep.com/patent/US20140196198A1 ## CPC - A42B 3/063: {using layered structures} - F41H 1/04: Protection helmets (crash helmets A42B3/00) - A42B: HATS; HEAD COVERINGS (headbands A41D20/00; head-scarves A41D23/00) - F41H: ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL ## Abstract Embodiments of a protective helmet have a cushioning outer multilayer structure with at least two cushioning layers of materials having different densities and different geometric layouts, a multilayer hard inner structure attached to the interior surface of the cushioning multilayer structure, and an innermost cushioning structure attached to the inner surface of the multilayer hard inner structure. The multilayer hard inner structure is formed from at least two spaced layers of hard material and a layer of cushioning material therebetween. The innermost cushioning structure may be a multilayer structure similar to the outer multilayer structure with at least two cushioning layers of materials having different densities and different geometric layouts. The innermost cushioning structure may include sensors, optionally in a separate layer, and a thermal-control layer. A flexible thin cover extending around an outer surface of said shell and with or without graphics may be provided. ## Claims ### Claim 1 A protective helmet comprising: a cushioning outer multilayer structure comprising two cushioning layers of materials having different densities and different geometric layouts, said cushioning outer multilayer structure having a concave interior surface and a convex exterior surface; a multilayer hard inner structure having a concave interior surface and a convex exterior surface, said concave exterior surface of said hard inner structure attached to said concave interior surface of said cushioning multilayer structure, said multilayer hard inner structure formed from at least two spaced layers of hard material and a layer of cushioning material therebetween, said hard material being substantially harder than said materials of said two cushioning layers of said outer multilayer structure and being substantially harder than said material of said cushioning material of said multilayer hard inner structure; and an innermost cushioning structure attached to said concave inner surface of said multilayer hard inner structure. ### Claim 2 (depends on 1) A protective helmet according to claim 1, further comprising: a flexible thin cover extending around said convex exterior surface of said cushioning outer multilayer structure. ### Claim 3 (depends on 1) A protective helmet according to claim 1, wherein: said cushioning outer multilayer structure comprises an outer foam shell having a concave inner surface and a relatively inner foam layer only partially covering said concave inner surface of said outer foam shell and including structure defining gaps. ### Claim 4 (depends on 3) A protective helmet according to claim 3, wherein: said cushioning outer multilayer structure is less than 15 mm in thickness. ### Claim 5 (depends on 1) A protective helmet according to claim 1, wherein: said cushioning outer multilayer structure comprises an outer foam shell, a relatively inner foam layer, and a springy layer between said outer foam shell and said relatively inner foam layer. ### Claim 6 (depends on 1) A protective helmet according to claim 1, wherein: said multilayer hard inner structure is between 1 and 10 mm thick. ### Claim 7 (depends on 6) A protective helmet according to claim 6, wherein: said two spaced layers of hard material comprise at least one of carbon fiber structures, polycarbonate, para-arimid synthetic fiber, and ultra-high-molecular-weight polyethylene. ### Claim 8 (depends on 7) A protective helmet according to claim 7, wherein: each of said two spaced layers of hard materials is between 1 and 2 mm thick. ### Claim 9 (depends on 7) A protective helmet according to claim 7, wherein: said layer of cushioning material of said multilayer hard inner structure comprises one of foam and gel. ### Claim 10 (depends on 1) A protective helmet according to claim 1, wherein: said innermost cushioning structure comprises two cushioning foam layers having different densities and different geometric layouts. ### Claim 11 (depends on 10) A protective helmet according to claim 10, wherein: said innermost cushioning structure further comprises a plurality of impact sensors. ### Claim 12 (depends on 11) A protective helmet according to claim 11, wherein: said plurality of impact sensors are contained in at least one of said two cushioning foam layers of said innermost cushioning structure. ### Claim 13 (depends on 11) A protective helmet according to claim 11, wherein: said innermost cushioning structure comprises a third cushioning layer containing said plurality of impact sensors. ### Claim 14 (depends on 10) A protective helmet according to claim 10, wherein: said innermost cushioning structure comprises an innermost thermal-control layer. ### Claim 15 (depends on 14) A protective helmet according to claim 14, wherein: said innermost thermal-control layer is a passive thermal control layer. ### Claim 16 (depends on 8) A protective helmet according to claim 8, wherein: said innermost cushioning structure comprises two cushioning foam layers having different densities and different geometric layouts. ### Claim 17 (depends on 16) A protective helmet according to claim 16, wherein: said innermost cushioning structure further comprises a plurality of impact sensors. ### Claim 18 (depends on 16) A protective helmet according to claim 16, wherein: said innermost cushioning structure comprises an innermost thermal-control layer. ### Claim 19 (depends on 16) A protective helmet according to claim 16, wherein: said cushioning outer multilayer structure comprises an outer foam shell having a concave inner surface and a relatively inner foam layer only partially covering said concave inner surface of said outer foam shell and including structure defining gaps. ### Claim 20 (depends on 19) A protective helmet according to claim 19, wherein: said cushioning outer multilayer structure is less than 15 mm in thickness. ### Claim 21 (depends on 16) A protective helmet according to claim 16, wherein: said cushioning outer multilayer structure comprises an outer foam shell, a relatively inner foam layer, and a springy layer between said outer foam shell and said relatively inner foam layer. ### Claim 22 (depends on 20) A protective helmet according to claim 20, wherein: said protective helmet is at most 50 mm thick.