Portable blower tube noise reduction
September 18, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2929462 3831223 Noise-reducing blowing nozzle Noise suppressor for vacuum sweeper and the like Sound attenuator Noise reducing means for vacuum cleaner Upright type electric cleaner Ventilation fan with noise-attenuating housing Electric cleaner with minimum noise Lawn/garden blower/vacuum InventorsAssigneeApplicationNo. 664171 filed on 09/18/2000US Classes:15/326, With sound muffling feature15/330, Suction to or from blast181/225With fan to assist fluid flowExaminersPrimary: Till, Terrence R.Attorney, Agent or FirmForeign Patent References
International ClassesF01N 007/00F04D 029/66 AbstractThe present invention provides for noise reduction during operation of a portable blower by reducing the noise or acoustic energy escaping from the housing outlet and blower tube. The noise reduction is achieved by placing sound absorbing material in the blower tube. The sound absorbing material may include flared upstream and downstream ends to reduce turbulence. The sound absorbing material may be held within the blower tube by an insert frame such that substantial portions of the sound absorbing material are exposed to air passing through the blower tube. Also disclosed is a sound absorbing insert that can be placed within an existing blower tube to retrofit portable blowers with noise reduction technology.Field of SearchWith sound muffling featureSuction to or from blast Convertible Air blast only Carburetor, burner, or compressor intake silencer Pneumatic type motor (e.g., air hammer, etc.) Machine type enclosure Electical type devices (e.g., transformers, motors, etc.) Internal-combustion engine Partial enclosure or shroud Combined Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type) With fan to assist fluid flow Pipe-muffler (e.g., tail pipe type) Separate distinct units serially connected With exhaust pipe With sound absorbing material With sound absorbing material | |
