Patent US3335780A successfully refreshed from Google Patents.
US4066922A
Expired / Lapsed
US
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Electrical motor-control device for electrical equipment
Assignee: Alstom SA
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Filing: 1976-07-22
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Granted: 1978-01-03
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Expires: 1996-07-22
Abstract
Abstract Electrical motor-control device for electrical equipment comprising a drive mechanism including an electric motor and a movement transformation mechanism including an endless screw on which is installed a linearly displaceable nut connected with slight play to an operating member of the electrical equipment. A torque limiter is inserted between the drive mechanism and the movement transformation mechanism. The torque limiter comprises a disk made of rough material integral with a worm screw and has component parts in the form of segments of a ring connected by springs clamping the said disk made of friction material. Applications: remote control of electric circuit-breakers.
Inventors
- 👤 Jean Hennemann
- 👤 Bernard Daussin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:36
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/22; H01H3/26; H01H3/264; H01H3/54; H01H3/58; H01H71/00; H01H71/10; H01H71/66; H01H2071/665
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
134 words
An electric motor-control device for electrical equipment having drive means including: electric motor means connected through a torque limiter for driving a movement transformation mechanism provided with a worm screw; a nut unit mounted on said worm screw and movable along said worm screw, said nut unit being connectable to an operating member of the electrical equipment to be controlled; said torque limiter being defined by an elastic connection between two rotating members, one connected to said drive means and the other to said movement transformation mechanism; and an accentric cam; said cam rotating with said worm screw and a drive member bearing against said cam, said cam being spring-mounted on a driven gear of said drive means, whereby said gear rotates freely about an axis common to said cam and said worm screw.
Claim 2
Dependent Claim
134 words
An electric motor-control device for electrical equipment having drive means including: electric motor means connected through a torque limiter for driving a movement transformation mechanism provided with a worm screw; a nut unit mounted on said worm screw and movable along said worm screw, said nut unit being connectable to an operating member of the electrical equipment to be controlled; said torque limiter being defined by an elastic connection between two rotating members, one connected to said drive means and the other to said movement transformation mechanism; and an accentric cam; said cam rotating with said worm screw and a drive member bearing against said cam, said cam being spring-mounted on a driven gear of said drive means, whereby said gear rotates freely about an axis common to said cam and said worm screw.
Claim 3
Dependent Claim
63 words
A motor-control device for electrical equipment according to claim 1, wherein: said torque limiter comprises a friction connection between two rotating assemblies, one connected to said drive means and the other connected to said movement transformation mechanism, said friction connection exerting a frictional force between said assemblies decreasing as a function of the angular speed of said assembly connected to said drive means.
Claim 4
Dependent Claim
55 words
An electric motor-control device for electrical equipment, according to claim 2, wherein: said torque limiter comprises a disc formed of a rough material rotatable with said worm screw and clamp means defined by a segment of a ring connected together by springs for clamping said disc and rotating with a gear of said drive means.
Claim 5
Dependent Claim
33 words
An electric motor-control device for electrical equipment according to claim 3, wherein: said clamp means being provided with port means for engagement with a lug intergral with said gear of the drive mechanism.
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |