US5075904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helmet with reinforcement
Assignee: Shoei Co Ltd
•
Filing: 1990-08-01
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Granted: 1991-12-31
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Expires: 2010-08-01
Abstract
Abstract An improved helmet comprising a fiber reinforced thermosetting resin as a main component is disclosed. In the helmet, at least a part thereof to be subjected to shock adsorption property test defined by JIS T 8133 (1982) is reinforced with a cloth of polyethylene fiber having high tenacity and high modulus such as that having tensile strength of not less than 20 g/denier and tensile modulus of not less than 500 g/denier.
Inventors
- 👤 Yoshikazu Shirasaki
- 👤 Ichiro Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:59
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; A; A42; A42B; A42B3/00; A42B3/04; A42B3/06; A42B3/062; A42B3/063; B32B7/00; B32B7/02; B32B7/022; C; C08; C08J; C08J5/00; C08J5/04; C08L; C08L67/00; C08L67/06; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/10; B32B2262/101; B32B2307/00; B32B2307/50; B32B2307/54; B32B2437/00; B32B2437/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
68 words
A helmet having a body part comprising as a main component a fiber-reinforced thermosetting resin, wherein the improvement comprises a reinforcement of at a least part of the helmet to be subjected to a shock absorption property test with an outer layer of glass fiber, a middle layer of a cloth of polyethylene fiber having high tenacity and high modulus, and an inner layer of a glass fiber.
Claim 2
Dependent Claim
68 words
A helmet having a body part comprising as a main component a fiber-reinforced thermosetting resin, wherein the improvement comprises a reinforcement of at a least part of the helmet to be subjected to a shock absorption property test with an outer layer of glass fiber, a middle layer of a cloth of polyethylene fiber having high tenacity and high modulus, and an inner layer of a glass fiber.
Claim 3
Dependent Claim
30 words
The helmet according to claim 1, wherein the polyethylene fiber has a tensile strength of not less than 20 g/denier and a tensile modulus of not less than 500 g/denier.
Claim 4
Dependent Claim
30 words
The helmet according to claim 1, wherein the polyethylene fiber has a tensile strength of not less than 25 g/denier and a tensile modulus of not less than 1000 g/denier.
Claim 5
Dependent Claim
22 words
The helmet according to claim 1, wherein the cloth of polyethylene fiber has a weight of 100 to 400 g/m 2 .
Claim 6
Dependent Claim
22 words
The helmet according to claim 1, wherein the cloth of polyethylene fiber has a weight of 100 to 300 g/m 2 .
Claim 7
Dependent Claim
38 words
The helmet according to claim 1, wherein the polyethylene fiber occupies a volume proportion of 40 to 70% based on the volume of the total fibers in the part to be subjected to the shock absorption property test.
Claim 8
Dependent Claim
32 words
The helmet according to claim 1, wherein the thermosetting resin is at least one member selected from the group consisting of unsaturated polyester resin, vinyl ester resin, epoxy resin and polyurethane resin.
Claim 9
Dependent Claim
61 words
A helmet having a body part comprising as a main component a fiber-reinforced thermosetting resin, wherein the improvement comprises reinforcing at least a part of the helmet to be subjected to a shock absorption property test with a glass fiber arranged as an outer layer and a cloth of polyethylene fiber having high tenacity and high modulus as an inner layer.
Claim 10
Dependent Claim
61 words
A helmet having a body part comprising as a main component a fiber-reinforced thermosetting resin, wherein the improvement comprises reinforcing at least a part of the helmet to be subjected to a shock absorption property test with a glass fiber arranged as an outer layer and a cloth of polyethylene fiber having high tenacity and high modulus as an inner layer.
Claim 11
Dependent Claim
93 words
A helmet having a body part comprising as a main component a fiber-reinforced thermosetting resin, wherein the improvement comprises a laminated material in at least a part of the body part to be subjected to a shock absorption property test, the laminated material including an outer layer of glass fiber, a middle layer of a cloth of a general-purpose organic fiber, an inner layer of glass fiber, and at least one reinforcing layer of a cloth of polyethylene fiber having high tenacity and high modulus between said outer layer and said inner layer.
Claim 12
Dependent Claim
93 words
A helmet having a body part comprising as a main component a fiber-reinforced thermosetting resin, wherein the improvement comprises a laminated material in at least a part of the body part to be subjected to a shock absorption property test, the laminated material including an outer layer of glass fiber, a middle layer of a cloth of a general-purpose organic fiber, an inner layer of glass fiber, and at least one reinforcing layer of a cloth of polyethylene fiber having high tenacity and high modulus between said outer layer and said inner layer.
Claim 13
Dependent Claim
36 words
The helmet according to claim 9, wherein said at least one reinforcing layer includes a layer of the cloth of polyethylene fiber having high tenacity and high modulus between said middle layer and said inner layer.
Claim 14
Dependent Claim
36 words
The helmet according to claim 9, wherein said at least one reinforcing layer includes a layer of the cloth of polyethylene fiber having high tenacity and high modulus between said middle layer and said outer layer.
Claim 15
Dependent Claim
37 words
The helmet according to claim 11, wherein said at least one reinforcing layer further includes a layer of the cloth of polyethylene fiber having high tenacity and high modulus between said middle layer and said inner layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |