Sound isolation cap
AssigneeNational Research Council of Canada
InventorsGeorge Wong, Noland Lewis
Life of this patent
Estimating the term…
Abstract
A sound isolation cap for use with a sound level meter. The cap has a bore in which a plug snugly fits. The plug, in the open position, allows air to travel between the exterior of the cap and the cap's interior cavity. In the closed position, the plug prevents air from traveling between the exterior of the cap and the interior cavity. Air may travel between the interior cavity and the exterior of the cap by way of two passages. One passage connects the interior cavity with the bore while the other passage connects the bore with the exterior of the cap. When in use, the microphone of the sound level meter is inserted into the interior cavity.
Claims18
An acoustically shielding device for a sound level meter having a microphone, the device comprising:
- a body having an interior cavity and an exterior, said interior cavity being for snugly enveloping said microphone;
- a bore in said body, said bore being adjacent to said interior cavity, said bore being non-intersecting with said interior cavity;
- a first passage in said body for allowing air to travel between said exterior of said body and said bore;
- a second passage in said body for allowing air to travel between said interior cavity and said bore;
- and
- a plug snugly fitting in said bore, said plug having an open position and a closed position;
- wherein, in said open position, said plug allows air to travel between said interior cavity and said exterior of said body by way of said first and second passages;
- and
- wherein, in said closed position, said plug prevents air from traveling between said interior cavity and said exterior of said body.
A method of acoustically shielding a sound receptor of a sound level meter, the method comprising:
- a) providing an acoustically shielding device having an interior cavity;
- b) actuating a plug on said device to create an air passage between said interior cavity and an exterior of said device;
- c) inserting said sound receptor into said interior cavity and allowing air to escape from said interior cavity to said exterior by way of said air passage created in step b);
- and
- d) closing said air passage to thereby acoustically seal said sound receptor in said interior cavity.
Dependencies are inferred from the claim text.