Patent US4714988A successfully refreshed from Google Patents.
Patent US4006496A successfully refreshed from Google Patents.
US4006496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety helmet
Assignee: Land Tool Co
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Filing: 1975-08-13
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Granted: 1977-02-08
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Expires: 1995-08-13
Abstract
Abstract A lightweight safety helmet for use by the operator of a motorcycle, or the like. The helmet meets all present day standards and specifications as well as the more strigent standards and specifications proposed by the construction of a single shell helmet having a dual shock liner system.
Inventors
- 👤 Peter O. Marker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:22
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/10; A42B3/12; A42B3/125; A42B3/128
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
A safety helmet comprising an outer shell shaped to be worn on the head of a user and constructed of a preselected lightweight material having a high flexural modulus for distributing an impact load, a shock absorbing liner including integral stiffening pads adapted to be carried by the shell, the stiffening pads being constructed and defined to cover the brow areas and rear areas of the shell when the helmet is worn on the head of the user and extending in contact with the inner wall of the shell at said edges, and a resilient shock dampening layer arranged between the inner wall of the shell and the outer surface of the shock absorbing liner and extending coextensively with the inner wall of the shell to said stiffening pads for the shock absorbing liner, the resilient layer and shock absorbing liner being arranged in a close friction fit with the inside wall of the shell, the resilient layer and shock absorbing layer being constructed and defined for coacting to absorb the impact energy transmitted through the outer shell and to release the stored energy after impact without any permanent deformation.
Claim 2
Dependent Claim
190 words
A safety helmet comprising an outer shell shaped to be worn on the head of a user and constructed of a preselected lightweight material having a high flexural modulus for distributing an impact load, a shock absorbing liner including integral stiffening pads adapted to be carried by the shell, the stiffening pads being constructed and defined to cover the brow areas and rear areas of the shell when the helmet is worn on the head of the user and extending in contact with the inner wall of the shell at said edges, and a resilient shock dampening layer arranged between the inner wall of the shell and the outer surface of the shock absorbing liner and extending coextensively with the inner wall of the shell to said stiffening pads for the shock absorbing liner, the resilient layer and shock absorbing liner being arranged in a close friction fit with the inside wall of the shell, the resilient layer and shock absorbing layer being constructed and defined for coacting to absorb the impact energy transmitted through the outer shell and to release the stored energy after impact without any permanent deformation.
Claim 3
Dependent Claim
43 words
A safety helmet as defined in claim 1 wherein the resilient layer is characterized as having maximum recovery and viscous dampening properties to function for dampening and insulating impact energy and for maintaining a substantial majority of the stopping distance during multiple impacts.
Claim 4
Dependent Claim
21 words
A safety helmet as defined in claim 2 wherein the outer shell is constructed of a fiber glass reinforced plastic material.
Claim 5
Dependent Claim
21 words
A safety helmet as defined in claim 3 wherein the shock dampening layer is constructed of fine-celled flexible polyethylene foam material.
Claim 6
Dependent Claim
18 words
A safety helmet as defined in claim 4 wherein the shock liner is constructed of an expandible polystyrene.
Claim 7
Dependent Claim
49 words
A safety helmet as defined in claim 1 including a sizing liner having an expanded polystyrene foam material constructed and defined to cover the inner wall of the shell at the areas covering the ears of the user when the helmet is worn on the head of the user.
References Cited (Backward Citations)
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US3242500A
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US3500475A
Cited
US3465363A
Cited
US3609764A
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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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |