Patent US4648285A successfully refreshed from Google Patents.
US4648285A
Expired / Lapsed
US
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Apparatus for converting rotational motion to linear motion
Assignee: Waters Technologies Corp
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Filing: 1985-05-16
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Granted: 1987-03-10
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Expires: 2005-05-16
Abstract
Abstract Apparatus is provided for converting rotational motion to linear motion which includes a screw shaft and nut surrounding the screw shaft, each having a helical thread. A plurality of threaded planetary rollers is interposed between and in contact with the threads of the screw shaft and nut. The screw shaft has a different number of starts than the number of starts on the nut.
Inventors
- 👤 William W. Carson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:56
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/22; F16H25/2247; F16H25/2252; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19702; Y10T74/19721; Y10T74/19744; Y10T74/19781; Y10T74/19791; Y10T74/19795; Y10T74/19949; Y10T74/19953
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
Apparatus for converting rotational motion to linear motion which comprises a screw shaft having a screw shaft thread with at least one start, a nut surrounding said screw shaft, said nut having an inner surface and a nut thread having at least one start on said inner surface, said nut thread having a different number or direction of starts than the starts of the thread on said screw shaft and at least one threaded planetary roller interposed between and meshing with said nut thread and said screw shaft thread whereby concentricity between said screw shaft and said nut is maintained, and wherein said threads follow a generally helical path but change direction along said generally helical path.
Claim 2
Dependent Claim
117 words
Apparatus for converting rotational motion to linear motion which comprises a screw shaft having a screw shaft thread with at least one start, a nut surrounding said screw shaft, said nut having an inner surface and a nut thread having at least one start on said inner surface, said nut thread having a different number or direction of starts than the starts of the thread on said screw shaft and at least one threaded planetary roller interposed between and meshing with said nut thread and said screw shaft thread whereby concentricity between said screw shaft and said nut is maintained, and wherein said threads follow a generally helical path but change direction along said generally helical path.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 which includes at least two planetary rollers.
Claim 4
Dependent Claim
12 words
The apparatus of claim 1 which includes at least three planetary rollers.
Claim 5
Dependent Claim
23 words
Apparatus of claim 1 wherein a helix angle of each planetary roller is substantially equal to a helix angle of the screw shaft.
Claim 6
Dependent Claim
22 words
Apparatus of claim 1 wherein a helix angle of each planetary roller is substantially equal to the helix angle of the nut.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |