US3884090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller screw mechanism
Assignee: SKF Industrial Trading and Development Co BV
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Filing: 1973-04-19
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Granted: 1975-05-20
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Expires: 1993-04-19
Abstract
Abstract Roller screw mechanism comprising a screw member having an external thread, a nut circumscribing the screw member having an internal thread, a plurality of rollers in the annular space between said members having a groove configuration adapted to interengage with threads on the nut and screw members, and a cage for guiding said rollers, said nut comprising at least one pair of members having means adjacent their confronting axial ends defining circumferentially extending pocket and said cage consisting of an annular portion centrated in said pocket and a plurality of circumferentially spaced fingers projecting from said central annular portion axially in each direction to define a plurality of apertures on either side of the central annular portion for the rollers, each of said rollers having a web portion and said central annular portion being provided with circumferentially spaced recesses at least partly enclosing the web portion of said rollers.
Inventors
- 👤 Lars Ingmar Dock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:59
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2247; F16H25/2252; D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10; F01; F01D; F01D9/00; F01D9/02; F01D9/04; F01D9/042; F16H25/2003; F16H25/2006; F16H2025/2257; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19744; Y10T74/19781; Y10T74/19791; Y10T74/19795; Y10T74/1987; Y10T74/19893; Y10T74/19898; Y10T74/19902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
Roller screw mechanism comprising a screw member having an external thread, a nut circumscribing the screw member having an internal thread, a plurality of rollers in the annular space between said members having a groove configuration adapted to interengage with threads on the nut and screw members, and a cage for guiding said rollers, said nut comprising at least one pair of members having means adjacent their confronting axial ends defining a Circumferentially extending pocket and said cage consisting of an annular portion centrated in said pocket and a plurality of circumferentially spaced fingers projecting from said central annular portion axially in each direction to define a plurality of aperatures on either side of the central annular portion for the rollers, each of said rollers having a web portion and said central annular portion being provided with circumferentially spaced recesses at least partly enclosing the web portion of said rollers.
Claim 2
Dependent Claim
150 words
Roller screw mechanism comprising a screw member having an external thread, a nut circumscribing the screw member having an internal thread, a plurality of rollers in the annular space between said members having a groove configuration adapted to interengage with threads on the nut and screw members, and a cage for guiding said rollers, said nut comprising at least one pair of members having means adjacent their confronting axial ends defining a Circumferentially extending pocket and said cage consisting of an annular portion centrated in said pocket and a plurality of circumferentially spaced fingers projecting from said central annular portion axially in each direction to define a plurality of aperatures on either side of the central annular portion for the rollers, each of said rollers having a web portion and said central annular portion being provided with circumferentially spaced recesses at least partly enclosing the web portion of said rollers.
Claim 3
Dependent Claim
24 words
Roller screw mechanism as claimed in claim 1 wherein the diameter of the web portion is less than the largest diameter of the roller.
Claim 4
Dependent Claim
43 words
Roller screw mechanism as claimed in claim 2 wherein the clearance between said recesses and said web portion of the rollers permits displacement of said rollers in a radial direction, a distance corresponding to at least the thread depth of said screw member.
Claim 5
Dependent Claim
34 words
Roller screw mechanism as claimed in claim 2 wherein the clearance between the cage and roller permits axial movement of said rollers a distance corresponding to at least the pitch of the screw thread.
Claim 6
Dependent Claim
51 words
Roller screw mechanism as claimed in claim 1 wherein said pocket is disposed radially outwardly of said annular space and the fingers are disposed approximately centrally of the annular space and are formed integrally with the inner extremeties of the central portion of said cage on opposite sides of said recesses.
References Cited (Backward Citations)
US2683379A
Cited
US3726151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |