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US3721993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auditory protection on safety helmets
Assignee: Individual
•
Filing: 1971-03-12
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Granted: 1973-03-27
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Expires: 1991-03-12
Abstract
Abstract The present invention relates to an arrangement for preventing auditory damage and keeping out irritating noises. It consists of ear muffs displaceable on clamps pivotably arranged with attachment units on a safety helmet. The invention is characterized mainly in that each attachment unit on the helmet is provided with, in addition to attaching means for pivotable attachment on the safety helmet, adjusting means acting on the clamp which is attached to the attachment unit on the helmet and determines the contact pressure. As a result, the ear muffs can be easily lifted off, even with a gloved hand, and swung up to a resting position on the safety helmet.
Inventors
- 👤 B Lonnstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:31
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/16; A42B3/166; A61; A61F; A61F11/00; A61F11/06; A61F11/14; Y; Y10; Y10S; Y10S2/00; Y10S2/908; Y10S2/909
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
An auditory protection device to be mounted on a safety helmet or the like, comprising an ear muff, a support arm on which said ear muff is mounted, an attachment unit, means mounting the upper end of the arm on said attachment unit for pivotal movement about a forwardly and rearwardly extending axis relative to said attachment unit, means mounting said attachment unit on said safety helmet or the like for forward and rearward vertical swinging movement of said arm and ear muff between a position in which the ear muff is on the ear and a position in whIch the ear muff is off the ear, spring means acting on the upper end of the arm to bias the ear muff against the head with a contact pressure, and adjusting means to adjust said contact pressure.
Claim 2
Dependent Claim
137 words
An auditory protection device to be mounted on a safety helmet or the like, comprising an ear muff, a support arm on which said ear muff is mounted, an attachment unit, means mounting the upper end of the arm on said attachment unit for pivotal movement about a forwardly and rearwardly extending axis relative to said attachment unit, means mounting said attachment unit on said safety helmet or the like for forward and rearward vertical swinging movement of said arm and ear muff between a position in which the ear muff is on the ear and a position in whIch the ear muff is off the ear, spring means acting on the upper end of the arm to bias the ear muff against the head with a contact pressure, and adjusting means to adjust said contact pressure.
Claim 3
Dependent Claim
32 words
A device according to claim 1, in which the spring means comprises a separate spring element that is so mounted that it is engaged by the upper end portion of the arm.
Claim 4
Dependent Claim
28 words
A device according to claim 1, in which the arm is made of flexible material, said upper end of the arm being lengthened to form said spring means.
Claim 5
Dependent Claim
19 words
A device according to claim 3, in which the spring means is a coil spring coaxial with said axis.
Claim 6
Dependent Claim
47 words
A device according to claim 4, in which the arm comprises two substantially parallel legs that are joined to each other at their ends close to the ear muff, the upper end of each leg being shaped as a coil spring and thus forming said spring means.
Claim 7
Dependent Claim
43 words
A device according to claim 3, in which the attachment unit comprises a support attachable to the safety helmet, said support carrying pivotably an attachment housing in which is mounted said upper end of the arm, the spring means and the adjusting means.
Claim 8
Dependent Claim
129 words
A device according to claim 6, in which the arm comprises two substantially parallel legs that are joined to each other at their ends close to the ear muff, the upper end of each leg being shaped as a coil spring and thus forming said spring means, the legs of the arm being led through the side of the attachment housing facing the ear muff in separate guide slots, which allow the legs to swing out, said guide slots each comprising two mutually parallel, laterally displaced slot portions, an inner and an outer slot portion, which slot portions are connected by a transverse slot positioned perpendicular to the longitudinal direction of the slot portions, said outer slot portion opening into the edge of the attachment housing facing the helmet.
Claim 9
Dependent Claim
70 words
A device according to claim 6, in which the adjusting means comprises an adjusting screw that is mounted in the attachment housing and can be turned from the outside, said screw having on the inside of said attachment housing an arm holder for the free end of the arm, so that said arm holder is displaced by turning the adjusting screw, thereby altering the contact pressure for the ear muff.
Claim 10
Dependent Claim
29 words
A device according to claim 6, in which between the attachment housing and the helmet is mounted a housing support that engages the housing as well as the helmet.
Claim 11
Dependent Claim
26 words
A device according to claim 6, in which at least the attachment housing and an end portion of said support are made of electrically insulating material.
References Cited (Backward Citations)
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |