US4247842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cut-in resistance for motor vehicle heating fans
Assignee: Ford Motor Co
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Filing: 1979-09-06
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Granted: 1981-01-27
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Expires: 1999-09-06
Abstract
Abstract This specification discloses a cut-in resistance for motor vehicle heating fans with a first resistance wire winding which can be cut into an electric fan motor either alone or in series with a second resistance wire winding. The first winding is arranged in the interior of a ceramic tube and the second winding is arranged on the outside of the ceramic tube. The ceramic tube is retained solely by the ends of the resistance wires which are passed upwards to a ceramic plate and clamped by flat plug contacts. This produces a compact arrangement wherein the ceramic material can safely store generated heat without danger of heat damage to adjacent plastic components.
Inventors
- 👤 Helmut Bengsch
- 👤 Alfons Link
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:49
CPC Classifications
H; H01; H01C; H01C3/00; H01C3/14; H01C1/00; H01C1/02; H01C1/14; H01C3/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
A cut-in resistance for electrical heating fan motors, such as for motor vehicles, includes: a first winding and a second winding each winding made of resistance wire and each having a pair of flat plug contacts, said first winding being adapted to be cut into an electric fan motor either alone or in series with said second winding a ceramic tube and an associated, spaced ceramic plate supporting said flat plug contacts; said first winding being mounted on the interior surface of said ceramic tube and said second winding being mounted on the outer circumference surface of said ceramic tube, being coupled thereto by a circumferential winding; a perforated, U-shape metal cage means closed by said ceramic plate, said metal case means securing said ceramic plate and circumferentially, spacially surrounding said ceramic tube and said windings thereby shielding said first and second windings; and said ceramic tube being retained solely by the ends of the resistance wires which are passed toward said ceramic plate and firmly clamped by said flat plug contacts.
Claim 2
Dependent Claim
172 words
A cut-in resistance for electrical heating fan motors, such as for motor vehicles, includes: a first winding and a second winding each winding made of resistance wire and each having a pair of flat plug contacts, said first winding being adapted to be cut into an electric fan motor either alone or in series with said second winding a ceramic tube and an associated, spaced ceramic plate supporting said flat plug contacts; said first winding being mounted on the interior surface of said ceramic tube and said second winding being mounted on the outer circumference surface of said ceramic tube, being coupled thereto by a circumferential winding; a perforated, U-shape metal cage means closed by said ceramic plate, said metal case means securing said ceramic plate and circumferentially, spacially surrounding said ceramic tube and said windings thereby shielding said first and second windings; and said ceramic tube being retained solely by the ends of the resistance wires which are passed toward said ceramic plate and firmly clamped by said flat plug contacts.
Claim 3
Dependent Claim
33 words
A cut-in resistance as recited in claim 1 wherein said second winding has a smaller number of turns of thicker resistance wire and is arranged on the external circumference of said ceramic tube.
Claim 4
Dependent Claim
68 words
A cut-in resistance as recited in claims 1 or 2, further comprising bores in said ceramic plate, and bent parts and terminal lugs associated with said flat plug contacts, said flat plug contacts being riveted externally to said ceramic plate and secured against twisting by said bent parts in said bores of said ceramic plate and connected to the ends of the resistance wires by said terminal lugs.
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |