Fluid-power device using axially offset rollers
Patent 4846007 Issued on July 11, 1989. Estimated Expiration Date: 
November 14, 2006. 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.
November 14, 2006. 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 ReferencesInventorApplicationNo. 06/931223 filed on 11/14/1986US Classes:74/424.92, Parallel to shaft74/441, Screw and nut92/2, ONE WORKING MEMBER RECIPROCATES AND ANOTHER ROTATES COMMON OUTPUT MEMBER92/33Element extends through working member portionExaminersPrimary: Braun, Leslie A.Assistant: Anchell, Scott Attorney, Agent or FirmInternational ClassesF15B 15/08 (20060101)F16H 25/22 (20060101) F15B 15/00 (20060101) AbstractA fluid-powered device having a body with interior helical grooves, an output shaft with exterior helical grooves, a plurality of rollers having circumferential grooves, and an axially reciprocating piston sleeve mounted within the body and retaining the rollers in axially offset and nested relation to each other and in fixed axial and circumferential position relative to the piston sleeve during powered operation of the device. The rollers are retained by the sleeve portion of the piston sleeve in circumferentially distributed arrangement between the grooved body and shaft surface portion in seated engagement with the grooved body and in seated engagement with the grooved output shaft for transmitting force between the body, output shaft and piston sleeve.Other References
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