Patent US3885175A successfully refreshed from Google Patents.
US3885175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor variable speed and control drive
Assignee: Frankl and Kirchner GmbH and Co KG
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Filing: 1973-12-26
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Granted: 1975-05-20
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Expires: 1993-12-26
Abstract
Abstract An electric motor variable speed and control drive having a motor, a brake and a clutch element combined with the motor and a control unit for operating the brake and clutch elements in a predetermined sequence. The control unit includes a transformer which is a ring-core transformer mounted in or on the motor or the brake and clutch elements coaxially with the axis thereof.
Inventors
- 👤 Herbert Palloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:22
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/10; D05B69/12; D05B69/125; H; H01; H01F; H01F27/00; H01F27/40; H02; H02K; H02K7/00; H02K7/10; H02K7/112; H02K7/1125
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
In an electric motor variable speed and control drive comprising a housing, a motor within said housing and including a drive shaft disposed within said housing and extending therefrom, a clutch and brake unit means within said housing for connecting said drive shaft to said motor and for braking said drive shaft, and a control unit means connected to said housing for operating said clutch and brake unit means in a predetermined sequence, wherein said control unit means includes a transformer, the improvement wherein said transformer is made in the form of a ring-core transformer and is mounted within said housing coaxially with respect to the axis of said motor and said clutch and brake unit means.
Claim 2
Dependent Claim
117 words
In an electric motor variable speed and control drive comprising a housing, a motor within said housing and including a drive shaft disposed within said housing and extending therefrom, a clutch and brake unit means within said housing for connecting said drive shaft to said motor and for braking said drive shaft, and a control unit means connected to said housing for operating said clutch and brake unit means in a predetermined sequence, wherein said control unit means includes a transformer, the improvement wherein said transformer is made in the form of a ring-core transformer and is mounted within said housing coaxially with respect to the axis of said motor and said clutch and brake unit means.
Claim 3
Dependent Claim
45 words
A drive in accordance with claim 1, wherein said motor includes a fan to draw cooling air into said housing and around said motor and said clutch and brake unit means and wherein said ring-core transformer is mounted in the path of said cooling air.
Claim 4
Dependent Claim
37 words
A drive in accordance with claim 1, further including bearing plates within said housing supporting said motor and said clutch and brake unit means and wherein said ring-core transformer is fastened to one of said bearing plates.
Claim 5
Dependent Claim
25 words
A drive in accordance with claim 2, wherein an extension of said housing covers and fan and said ring-core transformer is mounted in said extension.
Claim 6
Dependent Claim
42 words
A drive in accordance with claim 1, further including support surface means connected to said housing for supporting at least one radial surface and one cylindrical surface of said ring-core transformer and wherein said transformer is mounted on said support surface means.
Claim 7
Dependent Claim
23 words
A drive in accordance with claim 5, wherein said ring-core transformer is fastened by means of casting resin to said support surface means.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |