US3829900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety hat energy absorbing liner
Assignee: MSA Safety Inc
•
Filing: 1973-08-30
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Granted: 1974-08-20
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Expires: 1993-08-30
Abstract
Abstract A dome-like liner that will fit inside of a safety hat is formed from a plurality of stacks of stiff but deformable tubes, the tubes in each stack being arranged in superimposed rows with the tubes in each row parallel and staggered relative to the tubes in the immediately adjoining rows. Each of the stacks is enclosed in a flexible sheath, the sheathed stacks being assembled to form the liner.
Inventors
- 👤 R Marangoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:26
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/10; A42B3/12; A42B3/124; A42B3/06; A42B3/062; A42B3/065; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24744
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
An energy absorbing liner for a safety hat, comprising a plurality of stacks of stiff permanently deformable tubes, the tubes in each stack being arranged in superimposed rows with the tubes in each row parallel, and a thin sheath of predetermined shape enclosing each of said stacks to hold the tubes therein together in said arrangement, said tube-containing sheaths being assembled into the form of a dome-like liner to fit the inside of a safety hat.
Claim 2
Dependent Claim
76 words
An energy absorbing liner for a safety hat, comprising a plurality of stacks of stiff permanently deformable tubes, the tubes in each stack being arranged in superimposed rows with the tubes in each row parallel, and a thin sheath of predetermined shape enclosing each of said stacks to hold the tubes therein together in said arrangement, said tube-containing sheaths being assembled into the form of a dome-like liner to fit the inside of a safety hat.
Claim 3
Dependent Claim
14 words
An energy absorbing liner according to claim 1, in which said tubes are straight.
Claim 4
Dependent Claim
43 words
An energy absorbing liner according to claim 1, in which said tubes are straight and vary in length from about 1 1/2 to 2 inches with an outer diameter of about 3/8 inch and an inner diameter between about 1/16 and 1/4 inch.
Claim 5
Dependent Claim
17 words
An energy absorbing liner according to claim 1, in which said tubes are deformed by crushing them.
Claim 6
Dependent Claim
18 words
An energy absorbing liner according to claim 4, in which said tubes are formed from a foamed plastic.
Claim 7
Dependent Claim
14 words
An energy absorbing liner according to claim 1, in which said tubes are cylindrical.
Claim 8
Dependent Claim
29 words
An energy absorbing liner according to claim 1, in which said rows of tubes are progressively more difficult to deform from the inside of said liner to the outside.
Claim 9
Dependent Claim
50 words
An energy absorbing liner according to claim 1, in which said stacks of tubes are in the form of upwardly tapered columns that curve upwardly and inwardly toward one another, the tubes in each column being disposed substantially end to end with the tubes in the two columns beside it.
Claim 10
Dependent Claim
16 words
An energy absorbing liner according to claim 1, in which said stacks and sheaths are hexagonal.
Claim 11
Dependent Claim
26 words
An energy absorbing liner according to claim 1, in which the tubes in each row are staggered relative to the tubes in the immediately adjoining rows.
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |