Electromagnetic device capable of controlling the revolving speed of a multi-fan assembly
Patent 6722859 Issued on April 20, 2004. Estimated Expiration Date: 
October 23, 2022. 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.
October 23, 2022. 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 1227291 1295618 2312627 Direct current brushless electric motor Ceiling fan Patent #: 4560321 InventorApplicationNo. 10278222 filed on 10/23/2002US Classes:417/326, Including means for selectively varying motor speed or rotary motor direction417/423.5, Plural units415/60, PLURAL RUNNERS SUPPORTED FOR RELATIVE MOTION OR ON SEPARATE SHAFTS416/98, SUSTAINED ANCILLARY MOVEMENT OF ROTARY WORKING MEMBER (E.G., CYCLIC FEATHERING, ETC.)416/123, Divergent rotation axes416/210RDistally supported on radial armExaminersPrimary: Yu, Justine R.Assistant: Liu, Han L Attorney, Agent or FirmInternational ClassesF04B 1700F04B 3500 AbstractA multi-fan assembly with a built in electromagnetic control device composed of a magnetic induction mask fixedly received in a space in a rotatable member, a magnetic flux coil fixedly connected to a central main shaft and snugly surrounded by the magnetic induction mask, and a current control unit also fixedly connected to a central main shaft, wherein the current control unit sends a desired current to the magnetic flux coil to produce a magnetic flux which magnetizes the silicon steel core of the magnetic flux coil to attract the metal magnetic induction mask thereby generating a resistant force to reduce the revolving speed of the two member fans round the central main shaft. Three options are designed for manipulating the current coming out of the current control unit; a direct wired wall control switch, or a wireless remote controlling using infra-red design or an automatic speed control using a speed detecting sensor.Field of SearchIncluding means for selectively varying motor speed or rotary motor directionPlural units WITH ILLUMINATION MEANS SUSTAINED ANCILLARY MOVEMENT OF ROTARY WORKING MEMBER (E.G., CYCLIC FEATHERING, ETC.) PLURAL IMPELLERS HAVING RELATIVE MOVEMENT OR INDEPENDENT SUPPORTS Divergent rotation axes Distally supported on radial arm SPECIFIC DRIVE OR TRANSMISSION MEANS PLURAL RUNNERS SUPPORTED FOR RELATIVE MOTION OR ON SEPARATE SHAFTS With means for selective runner operation or drive shaft connection | |
