Reflective acoustical damping device for rooms

• US 4,548,292 A
• Filed: 10/01/1984
• Issued: 10/22/1985
• Est. Priority Date: 10/01/1984
• Status: Expired due to Term

• Current Assignee: Arthur M. Noxon
• Original Assignee: Arthur M. Noxon
• Inventors: Noxon, Arthur M.
• Primary Examiner(s): Fuller, Benjamin R.
• Application Number:
  US06/656,677
• Time in Patent Office: 386 Days
• Field of Search: 181/286, 181/287, 181/295, 181/290
• US Class Current: 181/295
• CPC Class Codes: E04B 1/8209 sound absorbing devices E04B1/8218, E04B1/8227 take precedence
• CPC Class Codes: E04B 1/84 Sound-absorbing elements

Abstract

An acoustical device for damping and absorption of certain frequencies in a room and including a surface which functions as a low pass filter to maintain low frequency absorptive properties without reducing the acoustical brightness of the room. The device may be embodied as a piece of free standing room furniture. A capped tube of the device defines an internal ambient air chamber. Exteriorly of the tube is a perforate sound reflective member. The perforation size and spacing function as a mechanical low pass cross-over system. A cross-over option is presented to include an imperforate limp mass sheet covering at least partially the absorbent tube surface.

Claims

1. A sound dampening device for use within a room area, said device comprising,

a continuous sound absorbent member of elongate tubular shape,

a closure means in place on the opposite ends of said absorbent member to define therewith a chamber,

porous sheet material in place about said sound absorbent member, and

a reflector overlying said porous sheet, said reflector having a reflective zone extending only partially about said absorbent member to reflect wave frequences approximately 300 Hz and above with the absorbent member serving to dampen lower frequencies.

2. The device claimed in claim 1 wherein said reflector is formed from rigid material.

3. The device claimed in claim 2 wherein said reflector has both sound wave reflective and absorbent zones.

4. The device claimed in claim 3 wherein said zones are perforate.

5. The device claimed in claim 4 wherein the reflective zone defines in cumulative open area of about 2 percent.

6. The device claimed in claim 5 wherein said reflective zone is of an expanse no greater than one half the perimeter of the device.

7. The device claimed in claim 1 wherein said reflector is a limp mass sheet.

8. The device claimed in claim 7 wherein said reflector has both a reflective zone and an absorbent zone.

9. The device claimed in claim 8 wherein said reflective zone is imperforate.

10. The device claimed in claim 9 wherein said reflective zone is of an expanse no greater than one half of the perimeter of the device.