US4588913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stepping motor linear actuator with internal clutch
Assignee: US Philips Corp
•
Filing: 1983-06-03
•
Granted: 1986-05-13
•
Expires: 2003-06-03
Abstract
Abstract A linear actuator having a rotor sleeve coupled through a thread to an output spindle, and a rotor-magnet sleeve surrounding the rotor sleeve for driving it. The rotor is maintained in step with the driving circuit even though the output spindle may have struck a stop, by providing a slip clutch between the rotor-magnet sleeve and the rotor sleeve.
Inventors
- 👤 Hans J. Adami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:41
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/06; H02K37/00; H02K37/24; H02K7/10; H02K7/108
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A linear actuator comprising a stepping motor stator, a rotor sleeve having a helical thread, mounted to be rotatable with respect to said stator, a threaded spindle engaging said helical thread and mounted to be axially movable with respect to said stator, and a rotor-magnet sleeve surrounding said rotor sleeve for imparting rotation to said rotor sleeve, characterized by comprising a slip coupling arranged between said rotor sleeve and said rotor-magnet sleeve and supporting said rotor-magnet sleeve with respect to said rotor sleeve, said slip coupling having a torque less than the maximum stepping motor torque, whereby engagement of said spindle with a stop does not cause the rotor-magnet sleeve to get out of step.
Claim 2
Dependent Claim
115 words
A linear actuator comprising a stepping motor stator, a rotor sleeve having a helical thread, mounted to be rotatable with respect to said stator, a threaded spindle engaging said helical thread and mounted to be axially movable with respect to said stator, and a rotor-magnet sleeve surrounding said rotor sleeve for imparting rotation to said rotor sleeve, characterized by comprising a slip coupling arranged between said rotor sleeve and said rotor-magnet sleeve and supporting said rotor-magnet sleeve with respect to said rotor sleeve, said slip coupling having a torque less than the maximum stepping motor torque, whereby engagement of said spindle with a stop does not cause the rotor-magnet sleeve to get out of step.
Claim 3
Dependent Claim
51 words
An actuator as claimed in claim 1, characterized in that said rotor-magnet sleeve has an inner wall, and the actuator comprises a coupling sleeve made of a material different from said rotor-magnet sleeve, arranged on said inner wall, and has a coupling sleeve inner wall which is an outer clutch surface.
Claim 4
Dependent Claim
47 words
An actuator as claimed in claim 2, characterized in that said slip coupling comprises a felt coupling sleeve arranged between the rotor sleeve and the coupling sleeve inner wall, said coupling being dimensioned and arranged to have a slipping torque slightly smaller than the maximum motor torque.
Claim 5
Dependent Claim
53 words
An actuator as claimed in claim 2, characterized in that said slip coupling comprises a layer of an adhesive grease which fills a coupling gap between the rotor sleeve and said coupling sleeve inner wall, said coupling being dimensioned and arranged to have a slipping torque slightly smaller than the maximum motor torque.
Claim 6
Dependent Claim
19 words
An actuator as claimed in claim 4, characterized in that said adhesive grease is based on highly viscous oils.
Claim 7
Dependent Claim
28 words
An actuator as claimed in claim 1, characterized in that said slip coupling comprises a layer of an adhesive grease, said rotor-magnet sleeve being supported through said grease.
Claim 8
Dependent Claim
19 words
An actuator as claimed in claim 6, characterized in that said adhesive grease is based on highly viscous oils.
Claim 9
Dependent Claim
28 words
An actuator as claimed in claim 1, characterized in that said slip coupling comprises a felt coupling sleeve, said rotor-magnet sleeve being supported through said felt coupling sleeve.
Claim 10
Dependent Claim
28 words
An actuator as claimed in claim 1, characterized in that said coupling is dimensioned and arranged to have a slipping torque slightly smaller than the maximum motor torque.
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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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |