# US 5,706,249 A · Panel spacer with acoustic and vibration damping

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- Number: US 5,706,249 A
- Document ID: US5706249A
- Status: Granted
- Kind: A
- Application number: 08/626,053
- Filed: 1996-04-01
- Granted: 1998-01-06
- Earliest claimed: 1996-04-01
- Inventors: William B. Cushman
- Web page: https://patentgrep.com/patent/US5706249A

## CPC

- F16F 15/02: Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems ({F16F15/005 takes precedence } ; layered products B32B; suppression of vibration in ships B63; {relieving load on bearings, using magnetic means F16C39/06})
- G10K 11/175: using interference effects; Masking sound
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR

## Abstract

A panel spacer is disclosed that enhances the natural damping characteristics of the material used for construction. The spacer is shaped to redirect acoustic and vibrational energy into a direction parallel to the panel surfaces and to take advantage of the faster energy propagating through the material of the spacer relative to surrounding gasses. Energy propagating through the spacer will arrive at a mid-point of the spacer well before sound originating from the same source can reach the same point through air or another gas. The phase discrepancy between the induced displacements of the spacer and the surrounding gas is used to dissipate energy by causing the spacer to interacting viscously with the gas.

## Claims

### Claim 1

An acoustic and vibration damping spacer to hold apart and transmit loads between at least two surfaces comprised of:
a) a structure with at least two contact areas that contact and hold apart said surfaces, with the area of said contact areas being less than the area of said surfaces, so that pressure per unit of area applied to one of said surfaces is increased at said contact area substantially proportionate to the ratio of the areas of said surface and said contact area, and
b) with said structure embodying an extended area substantially parallel to said surfaces, such that acoustic or vibrational energy propagating through said structure is substantially redirected into said extended area and such that said extended area interacts viscously with any gasses held between said surfaces.

### Claim 2 (depends on 1)

The acoustic and vibration damping spacer of claim 1 with apertures in said extended area whereby viscous interactions with any gasses held between said surfaces are enhanced.

### Claim 3 (depends on 1)

The acoustic and vibration damping spacer of claim 1 with said extended area comprised of a filament or a plurality of filaments.

### Claim 4 (depends on 1)

The acoustic and vibration damping spacer of claim 1 with said extended area comprised of a regular or irregular polygon shape.

### Claim 5 (depends on 1)

The acoustic and vibration damping spacer of claim 1 with said extended area of claim 1 comprised of an elliptical or circular shape.

### Claim 6

An acoustic and vibration damping spacer to hold apart and transmit loads between at least two surfaces comprised of:
a) a plurality of structures with at least two contact areas that contact and hold apart said surfaces with the area of said contact areas being less than the area of said surfaces, so that pressure per unit of area applied to one of said surfaces is increased at said contact area substantially proportionate to the ratio of the areas of said surface and said contact area, and
b) with said plurality of structures embodying an extended area substantially parallel to said surfaces that interconnects said plurality of structures such that acoustic or vibrational energy propagating through said plurality of structures is substantially redirected into said extended area and such that said extended area interacts viscously with any gasses held between said surfaces.

### Claim 7 (depends on 6)

The acoustic and vibration damping spacer of claim 6 with apertures in said extended area whereby viscous interactions with any gasses held between said surfaces are enhanced.

### Claim 8 (depends on 6)

The acoustic and vibration damping spacer of claim 6 with said extended area comprised of a filament or a plurality of filaments.

### Claim 9 (depends on 6)

The acoustic and vibration damping panel spacer of claim 6 with said extended area comprised of a sheet of material.