US4766028A
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US
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Damping device for damping notably the vibrations relative to a structural element
Assignee: MacDermid Graphics Solutions Europe SAS
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Filing: 1986-12-30
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Granted: 1988-08-23
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Expires: 2006-12-30
Abstract
Abstract The invention concerns a damping device having improved damping properties, including a lower damping viscoelastic layer made from a viscoelastic material affixed to a structural element, and an upper stress constraining layer located above the lower viscoelastic layer on the side opposite of the structural element. The upper stress constraining layer is a composite stress constraining layer having a stress constraining element embedded in a damping material. This stress constraining element can be a clothlike element selected from a knit, a woven or unwoven fabric, or can be prepared from a grid of bundles of strands linked together through welding or gluing.
Inventors
- 👤 Gerard Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:25
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/371; Y; Y10; Y10T; Y10T442/00; Y10T442/10; Y10T442/184; Y10T442/198; Y10T442/20; Y10T442/2041; Y10T442/2049; Y10T442/2057
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
74 words
A daming device for damping notably the vibrations relative to a structural element consisting essentially of a lower damping viscoelastic layer made from a damping viscoelastic material, affixed to a surface of a structural element to be damped, and an upper stress constraining layer located above the viscoelastic layer opposite to the structural element wherein the upper layer is a composite stress constraining layer having a stress constraining element embedded in a damping material.
Claim 2
Dependent Claim
74 words
A daming device for damping notably the vibrations relative to a structural element consisting essentially of a lower damping viscoelastic layer made from a damping viscoelastic material, affixed to a surface of a structural element to be damped, and an upper stress constraining layer located above the viscoelastic layer opposite to the structural element wherein the upper layer is a composite stress constraining layer having a stress constraining element embedded in a damping material.
Claim 3
Dependent Claim
39 words
The damping device of claim 1, wherein the stress constraining element is formed of one or more elongate elements of a mechanically resistant material, the elongate elements being linked or connected together at least at definite or discrete points.
Claim 4
Dependent Claim
23 words
The damping device of claim 2 wherein the elongate element are selected from the group consisting of strands, fibers and wisps of fibers.
Claim 5
Dependent Claim
18 words
The damping device of claim 2, wherein the stress constraining element is formed of one continuous elongate element.
Claim 6
Dependent Claim
42 words
The damping device of claim 1, wherein the stress constraining element is a cloth-like element made from one or more elongate elements selected from the group consisting of strands, fibers and wisps of fibers and being made of a mechanically resistant material.
Claim 7
Dependent Claim
12 words
The damping device of claim 5 wherein the cloth-like element is knitted.
Claim 8
Dependent Claim
12 words
The damping device of claim 5 wherein the cloth-like element is woven.
Claim 9
Dependent Claim
12 words
The damping device of claim 5 wherein the cloth-like element is unwoven.
Claim 10
Dependent Claim
28 words
The damping device of claim 8, wherein the unwoven cloth-like element is made from a grid of bundles of strands linked together by welds, adhesives, or heat bonds.
Claim 11
Dependent Claim
24 words
The damping device of claim 2 wherein the modulus of the one or more elongate elements ranges from about 6000 MPa to 660,000 MPa.
Claim 12
Dependent Claim
41 words
The damping device of claim 1 wherein the damping material of the upper stress constraining layer has damping properties over a temperature range from about -50° C. to +250° C. and has a modulus from about 0.1 to about 5000 MPa.
Claim 13
Dependent Claim
27 words
The damping device of claim 1 wherein the damping material is selected from the group consisting of elastomeric materials, heat curable polymers, themoplastic polymers and mixtures thereof.
Claim 14
Dependent Claim
28 words
The damping device of claim 1 wherein the damping material consists of several sub-layers, each sub-layer being of a different damping material having different damping properties or abilities.
Claim 15
Dependent Claim
20 words
The damping device of claim 1 wherein the stress constraining element is made of one or more non-metallic elongate elements.
Claim 16
Dependent Claim
20 words
The damping device of claim 1 wherein the stress supporting element is made of one or more metallic elongate elements.
Claim 17
Dependent Claim
16 words
The damping device of claim 2, wherein the stress supporting element may be calendered and/or stretched.
Claim 18
Dependent Claim
25 words
The damping device of claim 1 wherein the viscoelastic layer and the damping material of the stress supporting layer are made of the same material.
Claim 19
Dependent Claim
26 words
The damping device of claim 2 wherein the stress constraining element is formed of a number of elongate elements, each exhibiting a different modulus of rigidity.
Claim 20
Dependent Claim
50 words
A damping device consisting essentially of a lower viscoelastic layer and an upper constraining layer having a stress constraining cloth-like element embedded in a damping material, the damping material is selected from the group consisting of elastomeric materials, heat curable polymers and copolymers, thermoplastic polymers and copolymers and mixtures thereof.
Claim 21
Dependent Claim
50 words
A damping device consisting essentially of a lower viscoelastic layer and an upper constraining layer having a stress constraining cloth-like element embedded in a damping material, the damping material is selected from the group consisting of elastomeric materials, heat curable polymers and copolymers, thermoplastic polymers and copolymers and mixtures thereof.
Claim 22
Dependent Claim
40 words
A damping device consisting essentially of a lower viscoelastic layer and an upper viscoelastic layer formed of a same material as the lower layer and wherein the upper viscoelastic layer has a cloth-like stress constraining element embedded within the layer.
Claim 23
Dependent Claim
40 words
A damping device consisting essentially of a lower viscoelastic layer and an upper viscoelastic layer formed of a same material as the lower layer and wherein the upper viscoelastic layer has a cloth-like stress constraining element embedded within the layer.
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |