Silencer for a fan-cooled electric motor
Patent 3980912 Issued on September 14, 1976. Estimated Expiration Date: 
September 14, 1993. 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.
September 14, 1993. 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 2505854 2838262 2874008 2881337 3161013 3213304 3232371 3527969 3584469 3748507 InventorAssigneeApplicationNo. 05/581311 filed on 05/27/1975US Classes:310/51, Vibration or noise suppression181/202Electical type devices (e.g., transformers, motors, etc.)ExaminersPrimary: Skudy, R.Attorney, Agent or FirmInternational ClassesH02K 5/24 (20060101)H02K 9/14 (20060101) H02K 9/00 (20060101) AbstractAn electric motor has a motor housing and a fan at one end of the housing driven by the motor. The motor also has structure for directing air exhausted from the fan along the length of the motor housing to cool the motor. A silencer for the motor comprises an acoustical end panel disposed transversely of the motor housing and spaced axially from the end of the housing where the fan is mounted. A second acoustical panel is configured to define an open-ended member that at least partially surrounds the motor housing and is spaced from the housing. Each panel includes a layer of air-permeable sound absorbing material and an air-impermeable sheet disposed adjacent to the sound absorbing material on the side of the material opposite the motor housing. Air drawn in by the fan first passes radially inwardly of the motor housing along the end panel. Air exhausted from the fan passes between the second acoustical panel and the motor housing.Other References
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