US4903346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-part protective helmet
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1989-05-11
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Granted: 1990-02-27
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Expires: 2009-05-11
Abstract
Abstract A helmet with a forward face opening and a downward neck opening comprises a hard outer shell and a custom fittable and split inner shell which fits the head of the wearer without play, is easy to put on and take off, and has a high degree of mechanical stability and provides optimal wearer comfort. For this purpose the inner shell is connectable with the outer shell and it has a fixed inner contour custom fitted to the wearer's head, a one-piece outer shell is slipped over and forms the closure for the inner shell.
Inventors
- 👤 Hans Reddemann
- 👤 Tronje von dem Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:57
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/32; A42B3/324; A42B3/04; A42B3/10; A42B3/12; A42B3/125; A42C; A42C2/00; A42C2/007; Y; Y10; Y10S; Y10S2/00; Y10S2/908; Y10S2/909
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A protective helmet comprising an inner shell which is custom fittable and is formed of at least two connected inner shell split portions and an outer hard protective shell which is engageable over said split inner shell so that together the inner shell and the outer shell provide a face opening and a neck opening, said inner shell having a fixed interior contour fitted to the wearer's head, said outer shell being of one piece with an interior contour to engage over said inner shell.
Claim 2
Dependent Claim
85 words
A protective helmet comprising an inner shell which is custom fittable and is formed of at least two connected inner shell split portions and an outer hard protective shell which is engageable over said split inner shell so that together the inner shell and the outer shell provide a face opening and a neck opening, said inner shell having a fixed interior contour fitted to the wearer's head, said outer shell being of one piece with an interior contour to engage over said inner shell.
Claim 3
Dependent Claim
23 words
A protective helmet according to claim 1, wherein said inner shell has a tapered neck opening in an area overlying the wearer's chin.
Claim 4
Dependent Claim
54 words
A protective helmet according to claim 1, wherein said inner shell has an exterior contour around its exterior surface proceeding from the front of said inner shell toward the crown and over to the back thereof, which is complementary to the inner circumference of said outer shell so that they may be interfitted together.
Claim 5
Dependent Claim
16 words
A protective helmet according to claim 3, wherein said inner shell has a non-circular circumferential contour.
Claim 6
Dependent Claim
79 words
A protective helmet comprising an inner shell formed of two shell parts, means interconnecting said two shell parts of said inner shell together permitting their pivotal separation for removal of said shell parts from the wearer's head, an outer protective hard shell part having an interior contour complementary to the exterior contour of said inner shell for interfitting engagement over said inner shell, said outer shell holding said interconnecting parts of said inner shell together over the wearer's head.
Claim 7
Dependent Claim
79 words
A protective helmet comprising an inner shell formed of two shell parts, means interconnecting said two shell parts of said inner shell together permitting their pivotal separation for removal of said shell parts from the wearer's head, an outer protective hard shell part having an interior contour complementary to the exterior contour of said inner shell for interfitting engagement over said inner shell, said outer shell holding said interconnecting parts of said inner shell together over the wearer's head.
Claim 8
Dependent Claim
55 words
A protective helmet according to claim 5, wherein said means interconnecting said inner shell parts comprises a hinge pivoting said shell parts along a central line proceeding from the forehead over the crown of the head to the rear and a spring holding said shell parts together in an erected position over the wearer's head.
Claim 9
Dependent Claim
71 words
A protective helmet according to claim 6, wherein said inner shell includes an opened portion on each side for receiving an earpiece, said inner shell having a lower portion with a projection to engage over the area of the chin of the wearer and the exterior contour of said inner shell being non-spherical so as to prevent the rotation of said outer shell after it is engaged on said inner shell.
Claim 10
Dependent Claim
118 words
A protective helmet comprising an inner shell which is custom fittable and is formed of at least two split portions and an outer hard protective shell which is engageable over said split inner shell so that together they have a face opening and a neck opening, said inner shell having a fixed interior contour fitted to the wearer's head, said outer shell being of one piece with an interior contour to engage over said inner shell, said inner shell including two shell portions which are connected together along a central front and rear split line and means permitting pivotal spring biasing interconnection of said shell portions with a quick removal of said inner shell from the person's head.
Claim 11
Dependent Claim
118 words
A protective helmet comprising an inner shell which is custom fittable and is formed of at least two split portions and an outer hard protective shell which is engageable over said split inner shell so that together they have a face opening and a neck opening, said inner shell having a fixed interior contour fitted to the wearer's head, said outer shell being of one piece with an interior contour to engage over said inner shell, said inner shell including two shell portions which are connected together along a central front and rear split line and means permitting pivotal spring biasing interconnection of said shell portions with a quick removal of said inner shell from the person's head.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |