US4133308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective devices
Assignee: RACAL ACOUSTIC SERVICES Ltd
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Filing: 1977-02-24
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Granted: 1979-01-09
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Expires: 1997-02-24
Abstract
Abstract An improved anti-dust helmet comprising a shell spaced from the wearer's head by a supporting harness and provided with a transparent visor sealed at the sides to the wearer's face. Between the helmet shell and the wearer's head there is a sealing member extending continuously from the visor seals around the upper occipital part of the wearer's head. The sealing member is formed of a soft and resilient material and is so formed that the edge of the sealing member that rests against the wearer's head approaches the head at an acute angle. The sealing member may be fabricated or moulded from natural or synthetic rubber or from other elastomeric materials.
Inventors
- 👤 Brian A. Lowe
- 👤 Raymond Odell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:12
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/28; A42B3/288; A42B3/18; A42B3/22; A42B3/225; A62; A62B; A62B18/00; A62B18/04; A62B18/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
229 words
An improved anti-dust helmet including a hollow helmet shell member having inner and outer surfaces, said helmet shell member containing a lower open portion for receiving a user's head, and an open front viewing portion; air circulation means arranged within the rear portion of said helmet shell member for directing air forwardly of the helmet; supporting harness means connected within the helmet shell member for spacing the inner surface thereof from the user's head; transparent visor means mounted across the helmet open front viewing portion, said visor means being connected at its upper edge portion with said helmet shell member and being adapted at its side edges for sealing engagement with the user's face; the improvement which comprises sealing means for sealing the space between the occipital portion of the user's head and the inner surface of said helmet shell member, said sealing means including a soft resilient generally U-shaped member having an outer peripheral surface in sealed engagement with the inner surface of the helmet shell member, a deformably generally planar web portion extending radially inwardly from said outer peripheral surface, and an inner peripheral surface adapted for sealing engagement with the occipital portion of the user's head, said sealing member containing an air circulation opening in fluidic communication with said air circulation means, whereby air from said circulation means passes through said opening forwardly of the helmet.
Claim 2
Dependent Claim
229 words
An improved anti-dust helmet including a hollow helmet shell member having inner and outer surfaces, said helmet shell member containing a lower open portion for receiving a user's head, and an open front viewing portion; air circulation means arranged within the rear portion of said helmet shell member for directing air forwardly of the helmet; supporting harness means connected within the helmet shell member for spacing the inner surface thereof from the user's head; transparent visor means mounted across the helmet open front viewing portion, said visor means being connected at its upper edge portion with said helmet shell member and being adapted at its side edges for sealing engagement with the user's face; the improvement which comprises sealing means for sealing the space between the occipital portion of the user's head and the inner surface of said helmet shell member, said sealing means including a soft resilient generally U-shaped member having an outer peripheral surface in sealed engagement with the inner surface of the helmet shell member, a deformably generally planar web portion extending radially inwardly from said outer peripheral surface, and an inner peripheral surface adapted for sealing engagement with the occipital portion of the user's head, said sealing member containing an air circulation opening in fluidic communication with said air circulation means, whereby air from said circulation means passes through said opening forwardly of the helmet.
Claim 3
Dependent Claim
38 words
An anti-dust helmet is defined in claim 1, wherein said sealing member extends from one upper corner of side visor member obliquely along a line around the helmet crown to the opposite upper corner of said visor member.
Claim 4
Dependent Claim
46 words
An anti-dust helmet as defined in claim 1, wherein said sealing member has a transverse cross-section of a generally L-shaped configuration, said sealing member outer peripheral surface comprising an upstanding side wall portion connected in sealing relationship with the inner surface of said helmet shell member.
Claim 5
Dependent Claim
18 words
An anti-dust helmet as defined in claim 1, wherein said sealing member is formed from a synthetic material.
Claim 6
Dependent Claim
19 words
An anti-dust helmet as defined in claim 4, wherein said sealing member is formed of a closed-cell foamed polyurethane.
References Cited (Backward Citations)
US3438060A
Cited
US3963021A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |