US3583254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller nut-type linear drive
Assignee: Babcock and Wilcox Co
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Filing: 1969-11-05
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Granted: 1971-06-08
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Expires: 1989-11-05
Abstract
Abstract A linearly movable but nonrotatable screwshaft is actuated by a synchronous reluctance electric motor the rotor of which is formed by segment arms which concentrically orbit the screwshaft and carry roller nut sections to drive the shaft when the field of the motor rotates. The segment arms are movable radially through a small travel which is not sufficient to unmesh the roller nut sections from the screwshaft. The magnetic field of the motor urges the segment arms and roller nut sections in a radial direction corresponding to full meshing engagement of the nut sections. Spring bias moves the arms and nut sections in the reverse radial direction to apply braking pads when the field collapses.
Inventors
- 👤 Gordon R Winders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:47
CPC Classifications
F; F16; F16H; F16H25/00; F16H25/18; F16H25/20; F16H25/2025; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18704
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
149 words
In a linear drive including a tubular casing, a nonrotatable screwshaft axially movable therein, a sectional nut-type drive for the screwshaft including a plurality of radially movable nut sections meshing with the screwshaft, the threads of the screwshaft and of the nut sections being relatively deep in a radial direction, means biasing the nut sections outwardly away from full meshing interengagement with the screwshaft, electric motor driving means including a winding energizable to electromagnetically counterbias the nut sections into full meshing interengagement and to orbitally drive the nut sections to move the shaft, the novel cOmbination which comprises means limiting outward movement of the nut sections beyond a position corresponding to partial interengagement, and braking portions movable with the nut sections and movable to and from holding engagement with respect to the casing concurrently with movement of said nut sections to and from said position of partial interengagement, respectively.
Claim 2
Dependent Claim
149 words
In a linear drive including a tubular casing, a nonrotatable screwshaft axially movable therein, a sectional nut-type drive for the screwshaft including a plurality of radially movable nut sections meshing with the screwshaft, the threads of the screwshaft and of the nut sections being relatively deep in a radial direction, means biasing the nut sections outwardly away from full meshing interengagement with the screwshaft, electric motor driving means including a winding energizable to electromagnetically counterbias the nut sections into full meshing interengagement and to orbitally drive the nut sections to move the shaft, the novel cOmbination which comprises means limiting outward movement of the nut sections beyond a position corresponding to partial interengagement, and braking portions movable with the nut sections and movable to and from holding engagement with respect to the casing concurrently with movement of said nut sections to and from said position of partial interengagement, respectively.
Claim 3
Dependent Claim
64 words
A drive as defined in claim 1 wherein said electric motor is of the synchronous reluctance type having a rotor for driving the nut sections including levers of the first order rockable in radial planes and each lever having one arm defining a rotor segment and another arm carrying one of the nut sections, the braking means comprising pads carried by said last-mentioned arms.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |