Title: Exhaust muffler for pneumatic tool or machine

Abstract: An exhaust passageway is provided with a sound muffler comprising an orifice, and means operable against a spring in response to sudden increase of fluid exhaust pressure for relatively restricting the orifice thus to abate the sound of exhausting high pressure gas flow. As the gas pressure to be relieved diminishes in a first stage, the spring automatically enlarges the orifice, in effect, whereby the second stage exhausting is rapidly completed at unobjectionable noise level to permit recycling of a pneumatic machine or tool.

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Inventors: Gilberto, Paul (Milford, CT, US)

Application Number: 615907
Filing Date: 1975-09-23
Publication_date: 1976-09-21
Assignee: USM Corporation (Boston, MA)
Primary Class(es): 181/230
Other Classes:
US Patent Ref:

837347	Dec, 1906	Smith	181/36.
2419664	Apr, 1947	Tabbert	181/64.
2884901	May, 1959	Chandler et al.	181/36.
3254522	Jun, 1966	Elliott et al.	72/391.
3330378	Jul, 1967	Waldron	181/36.
3635605	Jan, 1972	Hall et al.	417/315.
3675732	Jul, 1972	Rosen et al.	181/36.

Other Refs:
Primary Examiner: Franklin, Lawrence R.
Assistant Examiner:
Attorney: Megley; Richard B., White; Vincent A., Johnson; Carl E.