Fluid-power device with rollers
Patent 4838103 Issued on June 13, 1989. Estimated Expiration Date: 
January 20, 2007. 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.
January 20, 2007. 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. 07/006007 filed on 01/20/1987US 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 International ClassesF15B 15/08 (20060101)F16H 25/22 (20060101) F15B 15/00 (20060101) AbstractA fluid-powered actuator having a body with interior helical grooves, an output shaft with exterior helical grooves, a first set of rollers in rolling engagement with only the body grooves and axially skewed at an angle corresponding to the lead angle of the body grooves, a second set of rollers in rolling engagement with only the output shaft grooves and axially skewed at a skew angle corresponding to the lead angle of the output shaft grooves, and an axially reciprocating piston sleeve mounted within the body and retaining the rollers in fixed axial and circumferential position relative to the piston sleeve during powered operation of the device. In several embodiments, the first and second sets of rollers are axially spaced apart.Other References
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