Patent US3820629A successfully refreshed from Google Patents.
US3820629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical louver for earthmoving vehicles
Assignee: Caterpillar Inc
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Filing: 1973-02-02
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Granted: 1974-06-28
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Expires: 1993-02-02
Abstract
Abstract A sound attenuation system having a plurality of acoustical louvers readily removably mounted across an air circulation opening in the engine enclosure of an earthmoving vehicle. Each acoustical louver includes an acoustical foam material batt mounted within an elongated D-shaped sheet material holder which has unattached overlapping end portions for allowing the compression of the holder and batt for facile manual installation in mounting rack slots disposed at opposite sides of said air circulation opening wherein the louver is held in place by spring tension which assures retention of the louver during use but allows rapid removal thereof, without recourse to special tools, for maintenance.
Inventors
- 👤 R Carlson
- 👤 J Kraina
- 👤 R Wegner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:32
CPC Classifications
B; B60; B60R; B60R19/00; B60R19/52; B60R13/00; B60R13/08; B60R13/0838; B60R13/0884; G; G10; G10K; G10K11/00; G10K11/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
In combination; acoustical noise attenuating louver means including; an elongated flexible batt of sound-energy absorbing material, said batt being substantially enclosed by partially perforate sheet material means, said sheet material means being resilient for permitting the compression and expansion of said batt therewithin, mounting rack means, aperture means in said sheet material means for engaging a portion of said mounting rack means to retain said acoustical louver means therein, said resiliEnt sheet material means including a D-shaped member having a curved apex portion and a pair of leg portions extending laterally therefrom, said leg portions each having an end portion folded normally with respect to each of said leg portions, one of said end portions being disposed in overlapping sliding relationship to said end portion.
Claim 2
Dependent Claim
125 words
In combination; acoustical noise attenuating louver means including; an elongated flexible batt of sound-energy absorbing material, said batt being substantially enclosed by partially perforate sheet material means, said sheet material means being resilient for permitting the compression and expansion of said batt therewithin, mounting rack means, aperture means in said sheet material means for engaging a portion of said mounting rack means to retain said acoustical louver means therein, said resiliEnt sheet material means including a D-shaped member having a curved apex portion and a pair of leg portions extending laterally therefrom, said leg portions each having an end portion folded normally with respect to each of said leg portions, one of said end portions being disposed in overlapping sliding relationship to said end portion.
Claim 3
Dependent Claim
42 words
The invention of claim 1 wherein said louver means further includes a loosely-fitted, thin, nonmetallic sheet material cover means disposed between said batt and said sheet material means for prohibiting contamination of said batt without substantially impairing its sound energy absorption characteristics.
Claim 4
Dependent Claim
32 words
The invention of claim 1 wherein one of said pair of laterally extending leg portions is perforate and wherein said other of said leg portions is imperforate except for said aperture means.
Claim 5
Dependent Claim
49 words
The invention of claim 3 wherein said mounting rack means includes slot means for receiving said louver means, said slot means including first and second parallel surfaces, said second surface having a protuberance engaging said aperture means when said acoustical louver means is mounted within said mounting rack means.
Claim 6
Dependent Claim
59 words
The invention of claim 4 wherein laterally extending leg portions are substantially parallel to each other and engage said first and second surfaces respectively when said acoustical louver means is mounted within said mounting rack means, said laterally extending leg portions being disposed normally in unparallel relation when said acoustical louver means is not mounted in said rack means.
Claim 7
Dependent Claim
15 words
The invention of claim 1 wherein said sound-energy absorbing material is open-cell polyester-based urethane foam.
Claim 8
Dependent Claim
86 words
In combination; acoustical noise attenuating louver means including; an elongated flexible batt of sound-energy absorbing material, said batt being substantially enclosed by partially perforate sheet material means, said sheet material means being resilient for permitting the compression and expansion of said batt therewithin, rigid mounting rack means including first and second parallel disposed rigid members, said first rigid member having a protuberance thereon, aperture means in said sheet material means for engaging said protuberance on said first rigid member to retain said acoustical louver means therein.
Claim 9
Dependent Claim
86 words
In combination; acoustical noise attenuating louver means including; an elongated flexible batt of sound-energy absorbing material, said batt being substantially enclosed by partially perforate sheet material means, said sheet material means being resilient for permitting the compression and expansion of said batt therewithin, rigid mounting rack means including first and second parallel disposed rigid members, said first rigid member having a protuberance thereon, aperture means in said sheet material means for engaging said protuberance on said first rigid member to retain said acoustical louver means therein.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |