Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1985-01-02
1986-09-02
Fuller, Benjamin R.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181237, 181239, 181272, 173DIG2, F01N 108
Patent
active
046090690
ABSTRACT:
A silencer for a pneumatically operated hydraulic jack equipped with an air motor is provided. The silencer comprises a first low-pressure chamber formed contiguously to the rear wall of the main cylinder of the air motor, a second low-pressure chamber formed contiguously to and behind the first low-pressure chamber, a baffleplate partitioning the first and second low-pressure chambers and having two groups of first holes formed at an angular displacement of 90 degrees from a pair of discharge holes formed diametrically opposite to each other and radially so as to discharge high-pressure air from the main cylinder of the air motor into the first low-pressure-chamber, and two groups of second holes formed at an angular displacement of 90 degrees from the two groups of the first holes respectively in the rear wall of the second low-pressure chamber to discharge air into the atmosphere. A valve disposed in the rear wall of the main cylinder is opened and closed automatically according to the reciprocation of the main piston of the air motor so that the compressed air supplied into the high-pressure side of the main cylinder is discharged for the return travel of the main piston. The high-pressure air discharged from the main cylinder of the air motor is branched into opposite flows and those opposite flows collide and dissipate their energy as they flow through the first and second holes so that exhaust noise of the air motor is suppressed.
REFERENCES:
patent: 2896580 (1959-07-01), Holdo
patent: 4093406 (1978-06-01), Miller
patent: 4407390 (1983-10-01), Le Blanc, Jr.
Fuller Benjamin R.
Yasui Sangyo, Ltd.
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