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US 4,049,075 AGranted
Sound damping apparatus
AssigneeMurphy Muffler, Inc.
InventorMilo E. Murphy
Life of this patent
Estimating the term…
Abstract
A sound damping apparatus has a resilient wall that defines a first volume and rigid wall defining a second or third volume. One rigid wall may be a part of the device muffled. A gas entry communicates with the volume defined by the resilient wall. The resilient wall and the rigid walls are in contact such that gas pressure separates the walls and the wall to intermittently define gas passages between volumes. Fluid within the wall surrounding the resilient wall dampens resilient wall vibration.
Claims3
A sound damper for gas streams emerging from a ported periphery comprising:
- a resilient first wall comprised of a cylindrical sheath of gas impervious material surrounding said periphery, said first wall including end portions extending between said sheath and said periphery defining a first volume into which said gas streams emerge;
- a rigid second wall concentrically surrounding said first wall defining a closed second volume between said first and second walls;
- a fluid filling said second volume;
- means for securing one of said end portions in gas tight relation to said periphery;
- and
- the other of said end portions resiliently opening in response to gas pressure to define intermittent gas exit means.
3 more elements
Dependencies are inferred from the claim text.