Hydraulic servo device with built-in accumulator
Patent 4601233 Issued on July 22, 1986. Estimated Expiration Date: 
October 5, 2004. 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 5, 2004. 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 2633712 2966888 3241464 3353637 3450005 3650162 InventorAssigneeApplicationNo. 06/658218 filed on 10/05/1984US Classes:92/52, Cylinder or sleeve forms working member92/152, With different cross-sectional areas92/60, WITH FLEXIBLE OR RESILIENTLY BIASED NON-WORKING MEMBER MOVABLE WALL IN CONSTANT COMMUNICATION WITH WORKING CHAMBER92/63With separate biasing means for a working memberExaminersPrimary: Garrett, Robert E.Assistant: Kapsalas, George Attorney, Agent or FirmInternational ClassesF16D 65/16 (20060101)F16D 65/14 (20060101) F16D 49/00 (20060101) F16H 63/30 (20060101) F16D 49/08 (20060101) F16D 49/12 (20060101) F16H 61/06 (20060101) Foreign Application Priority Data1983-10-14 JPAbstractA hydraulic servo device with a built-in accumulator, comprising a servo piston fit in a servo cylinder and connected via a stem to a band brake, an accumulator piston having a large diameter outer diameter portion and a small diameter outer diameter portion fit in the servo cylinder at two inner diameter portions thereof having different diameters and an inner diameter portion fit around a small diameter outer diameter portion of the servo piston, and an accumulator piston spring biasing the accumulator piston toward the servo piston. A servo release pressure acts on a pressure acting area defined by a large diameter outer diameter portion of the servo piston, a servo apply pressure acts on a pressure acting area defined between the large diameter outer diameter portion the servo piston and the small diameter outer diameter portion thereof, and an accumulator pressure acts on a pressure acting area defined between the large diameter outer diameter portion of the accumulator piston and the small diameter outer diameter portion thereof.Other References
Field of SearchOppositely movable walls of common chamber (69) (75)Cylinder or sleeve forms working member WITH FLEXIBLE OR RESILIENTLY BIASED NON-WORKING MEMBER MOVABLE WALL IN CONSTANT COMMUNICATION WITH WORKING CHAMBER With separate biasing means for a working member Oppositely movable walls of common chamber (50) (69) With different cross-sectional areas | |
