US3744332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw and nut mechanism
Assignee: SKF Industrial Trading and Development Co BV
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Filing: 1971-10-14
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Granted: 1973-07-10
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Expires: 1991-10-14
Abstract
Abstract In a screw and nut mechanism including transmission rollers the necessary displacement of the rollers one step backwards for each revolution of the nut with respect to the screw is brought about by at least one cam member, which operates between twin walls at the adjacent edge of cage, where the cam has a protected position and furthermore contacts the rollers about at their longitudinal axes.
Inventors
- 👤 S Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:49
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2247; F16H25/2252; F16H2025/2257; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19744; Y10T74/19781; Y10T74/19791; Y10T74/19795
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
229 words
In a screw and nut mechanism of the type where a cage supporting a plurality of rollers is fitted between an externally screw threaded shaft and an internally screw threaded nut enclosing the same, said rollers being provided with peripheral ribs meshing with the thread of said shaft and nut respectively, to form transmission elements therebetween, said rollers being operable during one revolution to be displaced in the axial direction of said shaft a distance corresponding to the pitch of its thread, and thereupon to be lifted free of its engagement with said shaft and be brought into a longitudinal groove in the nut, in which it is displaced backwards a distance corresponding to the pitch of the thread of said shaft, and then to engage the latter once more, the improvement comprising twin parallel walls at opposite axial ends of said cage, an annular cam member fitted at each end of said cage and having a sleeve portion at one portion shaped as a cam proper, extending inwardly between said twin walls to obtain contact with the juxtaposed ends of the rollers, and an external part for attachment to the nut in a position to being the cam proper into a position mating with that of the groove in the nut, said cams proper being reversely formed, one having a raising curve and the other a retracting curve.
Claim 2
Dependent Claim
229 words
In a screw and nut mechanism of the type where a cage supporting a plurality of rollers is fitted between an externally screw threaded shaft and an internally screw threaded nut enclosing the same, said rollers being provided with peripheral ribs meshing with the thread of said shaft and nut respectively, to form transmission elements therebetween, said rollers being operable during one revolution to be displaced in the axial direction of said shaft a distance corresponding to the pitch of its thread, and thereupon to be lifted free of its engagement with said shaft and be brought into a longitudinal groove in the nut, in which it is displaced backwards a distance corresponding to the pitch of the thread of said shaft, and then to engage the latter once more, the improvement comprising twin parallel walls at opposite axial ends of said cage, an annular cam member fitted at each end of said cage and having a sleeve portion at one portion shaped as a cam proper, extending inwardly between said twin walls to obtain contact with the juxtaposed ends of the rollers, and an external part for attachment to the nut in a position to being the cam proper into a position mating with that of the groove in the nut, said cams proper being reversely formed, one having a raising curve and the other a retracting curve.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |