Controllable vibration apparatus
Patent 5878851 Issued on March 9, 1999. Estimated Expiration Date: 
July 2, 2016. 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.
July 2, 2016. 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 2661596 2667237 2846028 2940749 2973969 3059915 3139760 3174587 Feedback control type shock absorbing suspension system Vibration damping equipment InventorsAssigneeApplicationNo. 674179 filed on 07/02/1996US Classes:188/269, Using diverse fluids188/267, Using magnetic flux188/322.15, Piston valve detail (e.g., seat design, structural arrangement, metering element)267/140.14With electronic or magnetic controlExaminersPrimary: Oberleitner, Robert J.Assistant: Lipka, Pamela J. Attorney, Agent or FirmForeign Patent References
International ClassF16F 009/06AbstractA controllable vibration apparatus having an electrical connection to a controllable valve made through a single-strand electrical conductor. In one embodiment, the piston and rod are preferably used as the source of ground or return electrical path. An axially compressed sealing element provides radial sealing against the conductor. An accumulator including a flexible diaphragm provides separation of fluid and accumulator chambers. In magnetorheological (MR) fluid dampers, a special sealing system including a relationship between piston rod surface finish and particle size is provided. A surface treated metal bushing is used with a lip seal to prevent escape of fluid and support side loads. The controllable valve can be formed from top and bottom pole pieces spaced from an outer ring to define a passageway. The pole and ring are preferably secured together by non-magnetic bridging elements. Preferably, the coil assembly is configured with integral axially-extending pins for ease of connection. Push-on connectors preferably make the connection between the conductor and pins. In a two single-strand conductor version, one single-strand carries the incoming current and the other the outgoing current.Other References
Field of SearchUsing magnetic fluxUsing diverse fluids With reservoir for fluid Including protective shield for retarder Piston valve detail (e.g., seat design, structural arrangement, metering element) Thrust member or piston structure Forming flexible wall enclosure for fluid With electronic or magnetic control | |
